SY/T 5385-1991 Laboratory measurement and calculation methods of rock resistivity parameters
Some standard content:
Petroleum and Natural Gas Industry Standard of the People's Republic of China SY/T5385—91
Laboratory measurement of rock resistivity parameters
and calculation methods
Published on July 19, 1991
Ministry of Energy of the People's Republic of China
Implementation on December 1, 1991
Scope of application of the subject content
Measurement device
Reagents:
Preparation of core samples
Treatment of core samples
Preparation of sodium fluoride solution
Evacuation and saturation of core samples
Measurement of rock resistivity parameters and calculation of derived parameters
(3)
Petroleum and Natural Gas Industry Standard of the People's Republic of China Laboratory measurement and calculation methods of rock resistivity parameters Subject content and scope of application
SY/T 6385 ---9r
This standard specifies the method for measuring and calculating rock resistivity parameters in the rock electrical laboratory (hereinafter referred to as rock electrical). This standard is applicable to the measurement and calculation of resistivity parameters of core samples in rock electrical laboratories. 2 Measurement capacity
High-pressure core sample holder:;
Normal pressure core sample holder
Resistivity measuring instrument,
Carboxylic resistance meter:
Double plunger ultra-micro pump;
Balance: The maximum weighing is 2000g, 160g, and the graduation value is 0.01g, 0,jmg! Electric heating blast drying box: The overflow range is 50-250°C. Directly connected high-speed flag-type vacuum pump: The exhaust rate is 41/s3 and the ultimate pressure is 0.07Pa! Vacuum gauge: basic range is 0～0.1MPa, accuracy is 2.5 level, fat extractor;
UV instrument;
high gas bottle,
volume flask: 500, 1000, 2000ml
lower desiccator: diameter 300mm
vacuum bottle: diameter 300mms
gradient measuring tube: 0～10ml;
drying tower: 500ml,
test tube: 10ml.
3 reagents
sodium chloride: analytical grade
ethanol: analytical grade,
methanol: analytical grade,
benzene: analytical grade1
nitric acid: analytical grade:
silica gel: desiccant.
Approved by the Ministry of Energy of the People's Republic of China on July 19, 1991 and implemented on December 1, 1991
4 Preparation of core samples
SY/T 5385--91bzxZ.net
4.1 Process the core sample into a cylinder with a diameter of 25mm and a length of 30mm. The end surface is flat and perpendicular to the axis of the cylinder. 4.2 Number the core samples.
4.3 Measure the diameter and length of the core sample.
4.3.1 The accuracy of the measuring tool used is ±0.02mm. 4.3,2 When measuring the diameter of the core sample, take three measurement data at different positions evenly distributed along the circumference of the core sample, and take the arithmetic mean as the diameter of the core sample. 4.3.3 When measuring the length of the core sample, take three measurement data at three evenly distributed positions on the two end surfaces of the core sample, and take the arithmetic mean as the length of the core sample. 4.4 Calculation formula of core sample constant K value: f=d
Wherein: K-core sample constant, m
d--core sample diameter, mz
Lcore sample length, m.
5 Treatment of core samples
5.1 Cleaning of salt and residual oil in core samples. 5.1.1 Washing
Soak the core sample in methanol for 5-7 days. Take a small amount of methanol solution that has not been used to soak the core sample with a dropper, drop it on the titration plate, and then drop silver nitrate to dissolve it, observe its color, if there is a milky white precipitate, call for more methanol solution to wash again. 5.1.2 Washing
The oil washing device is shown in Figure 1. Use a fat extractor and a mixture of benzene and ethanol (3:1, ethanol:1). Generally, 7-15 l of core sample is used for washing (the cleaning time can be extended for heavy oil). Take 3-5 ml of washing solution in a test tube and check it with an ultraviolet light instrument. It is clean if there is no fluorescence display by visual inspection.
5.2 Baking of samples
Bake the cleaned core samples in an electric hot air drying oven at 105±2°C for 8 hours. Put the dried core samples into a dryer containing alkali rubber. When the temperature drops to room temperature, weigh the mass of the core samples with a balance and record it.
6 Preparation of sodium hydride solution
6.1 Determine the amount of salinity solution required.
6.2 Add sodium chloride at 105±2°C for 2 hours.6.3 Determine the amount of sodium chloride required.
6.4 Weigh the required amount of sodium nitride with a balance. mass, pour it into a volumetric flask washed with distilled water, and add the required amount of distilled water to completely dissolve the sodium chloride. The concave liquid surface of the water should coincide with the scale line of the volumetric flask. 6.5 Check whether the concentration of the prepared solution is correct. a. Measure the dissolution resistivity with a conductivity meter, b. Measure the dissolution temperature;
C. Use the sodium chloride solution resistivity and temperature relationship chart to check the solution conductivity, which should be consistent with the corresponding value of this chart. 2
7 Evacuation and saturation of core samples
The core sample saturation device is shown in Figure 2.
Vacuum cellar bottle
Core sample
SY/T 5385-91
Figure Schematic diagram of oil washing device
Drain valve
Vacuum bottle
Schematic diagram of core sample saturation device
Special core sample
Direct connection high-speed rotary vane type
SY/T5385-91
7,1 The connection of each component of the vacuum device should be tight, and it should be kept sealed when the vacuum degree is close to 01MP. 72 The core sample crystal and solution (brine) will be evacuated at the same time:h, Open the drain valve and slowly inject the solution into the vacuum bottle storing the core sample, and continue to evacuate until no bubbles are discharged from the core (generally, continuous evacuation for 8 hours). 3 The vacuum-saturated core sample is left to stand in its solution for about 10 days. 8 Measurement of rock resistivity parameters and calculation of derived parameters 1.1 Measurement of resistivity parameters β, β. and calculation of formation factor F 8.1.1 The ambient temperature during measurement is controlled at 20 ± 2°C. 8.1.2 Calibrate the resistivity meter.
8.1.3 Measure the resistance of the solution after the core is saturated, and calculate the resistivity of the solution after the core is saturated according to formula (2). PwRwC
Where: ew
——Resistivity of the solution after the core is saturated, m, msR——Resistance of the solution after the core is saturated, 2, C——Liquid resistance meter constant, m.
8.1.4 Measure the solution temperature.
Measure the rock with the first percent saturated solution The core sample resistance scale. (The core resistance measurement diagram is shown in Figure 3). M
ＣＡRAＰＲCB
Figure 3 Core resistance measurement diagram
B, 1.5.1 Eliminate the influence of the surface (salt) of the core sample on the measurement power consumption rate. The specific steps are as follows: a, roll the core sample containing (salt) water evenly on a flat glass plate to remove the surface (salt) water, b, between the electrode and the core sample, use a magic skin that has not been soaked in solution to couple. It is required that there is no floating (salt) water on the skin surface. (2)
8.1.5.2 Place the core sample in the best position of the two electrodes of the high-pressure core sample holder (that is, the core of the core sample is in close contact with the gold wire electrode).
8.1.5.3 Data recording uses the resistivity measurement record sheet, and its format is shown in Table 1. 4
Well number:
Rock sample number Solution concentration
Measurer:
/ ('C)
SY/T 5385--91
Table 1 Formation factor measurement record (format)
Solution resistivity
Note, in the table, A is the cross-sectional area of the core sample, A=d=/4. 8.1.5.4 Calculate the resistivity of the core sample, the formula is: Rock sample resistance
Where: β. - Resistivity of the core sample when it contains 100% saturated solution, 2·R. - Resistance of the core sample when it contains 100% saturated solution, product; K
- Core sample constant, m.
8.1.5.5 Convert β. Calibrated to the same temperature as β, the formula is: pot = (po).. + 21.5
Jt1t + 21.5
w = (o) + 5
Where: β. +
- Resistivity of the core sample containing 100% saturated solution at standard temperature, ?·m - Resistivity of the falling liquid at standard temperature, ·m3(pr)t-
- Resistivity of the core sample containing 100% saturated solution at a certain temperature, 2·m, (o), - Resistivity of the saturated core sample solution at a certain temperature, ·m standard temperature, "C,
t1—Temperature when measuring the resistance of the core sample, "Ct"—Temperature when measuring the resistance of the saturated core sample solution, "C. 8.1.6 The relationship between the formation factor and porosity is calculated according to formula (6): F
Year Month Port
SY/T 5385-91
Wherein: F—formation resistivity factor, referred to as formation resistivity, P.
t1—Temperature when measuring the resistance of the core sample, "Ct"—Temperature when measuring the resistance of the saturated core sample solution, "C. 8.1.6 The relationship between the formation factor and porosity is calculated according to formula (6): F
Year Month Port
SY/T 5385-91
Wherein: F—formation resistivity factor, referred to as formation resistivity, P.
t1—Temperature when measuring the resistance of the core sample, "Ct"—Temperature when measuring the resistance of the saturated core sample solution, "C. 8.1.6 The porosity index (m) should be determined based on the measured formation factor and porosity. (6)
HDouble logarithmic coordinate paper is used to draw a cross plot of the selected set of core formation factors and porosity, as shown in Figure 4, and the regression line is obtained by the least square method. The slope of the regression line is the porosity index m. The intercept on the porosity axis is the lithology coefficient. Shenzhen Electric Power Corporation
06070 80 90 100
Porosity,
Figure 4 Cross plot of formation factors and porosity 8.2 Measurement of resistivity parameter e and calculation of resistivity index 8.2.1 Measurement and requirements
Comply with the provisions of Article 8.1 and carry out in accordance with the provisions of Article 8.2.2. 8.2.2 Oil-displacement-water method
The measurement device of the oil-displacement-water method is shown in Figure 5.
8.2.2.1 Measure with a resistivity meter and a high-pressure core holder. 8.2.2.2 The two ends of the core sample are coupled with filter paper. There is no floating (salt) water on the surface of the filter paper. 8.2.2.3 There is no floating (salt) water on the surface of the core sample. 8.2.2.4 Put the core sample into a rubber sleeve and then put it into the high-pressure core sample holder together with the rubber sleeve. The electrodes at both ends and the two ends of the core sample must be in close contact.
SY/T5385-91
Figure 5 Diagram of the measurement device of the oil-water displacement method
8.2.2.5 The water outlet at the lower end of the electrode is placed in a graduated measuring tube. 8.2.2.6 Measure the resistivity of the salt water core sample without applying pressure. Core sample holder
Double plunger
Micro pump
Scale gauge tube
8.2.2.7 Use the high efficiency column ultra-micro pump to control the oil pressure system. First, add a confining pressure of 1 to 7 MPa. The value of the confining pressure depends on the porosity and permeability of different core samples. The pressure should be 2 to 3 times higher than the flow pressure. 8.2.2.8 After the confining pressure stabilizes, turn off the confining pressure and apply the flow pressure. The value of the flow pressure depends on the porosity and permeability of the core sample being measured.
8,2.2.9 When the flow pressure increases, it can be seen from the resistivity meter that the resistance value is gradually increasing and stabilizing, and salt water is discharged from the lower port of the electrode. When the flow pressure stabilizes to a certain pressure, turn off the flow pressure, wait for the resistance value to stabilize, and the water output to stabilize, record the resistance value, temperature value t1, the volume of brine in the scale metering tube and the flow pressure value at this time. The first point measurement is completed. B.2.2.10, for the measurement of the second point, continue to increase the flow pressure appropriately, and after the flow pressure, resistance value and water output are stable, record the resistance value, temperature value, the volume of brine in the scale metering tube and the flow pressure at this time. The second point measurement is completed. For each subsequent point, repeat the method of 8.2, 2.9 and this article until no water is discharged from the core sample. The data recording format is shown in Table 2.
8.2.2.11 The calculation formulas for the resistivity index I and the water saturation S are 1
I: P
The resistivity of the core sample measured after oil-water displacement, 9m. S=
--the amount of brine discharged from the core sample, ml, Wuzhong:
and number,
measurer,
rock sample number:
SY/T 5385-91
Table 2 Saturation index measurement record (format) R
V——pore volume of core sample, cm.
8.2.3 Air blowing method
The schematic diagram of the air blowing method measurement device is shown in Figure 6). 8.2,3.1 Use high pressure core sample holder and resistivity meter for measurement (TE
Qusuo Jiao Tester
High Pressure Core
Sample Fire Holder
Figure 6 Schematic diagram of air blowing measurement device
8,2.3.2 The measurement and requirements are the same as those in Articles 81 and 8.2.2. 8.2.3.3 The two ends of the core sample are coupled with filter paper, and there is no floating (salt) water on the surface of the filter paper. 8.2.3.4 Remove the floating (salt) water on the surface of the core. 8
SY/T 5385--91
8.2.3.5 Use a balance to weigh the wet weight of the core sample and the mass of the sealing sleeve, and make a record. 8,2.3.6 Place the core sample in the sealing sleeve. Stick filter paper on both ends of the core sample, and then place it together with the sealing sleeve into the high-pressure core sample holder. Make the core sample in close contact with the electrodes at both ends. 8.2.3,7 Measure the resistivity βt of the salt water core sample when no pressure is applied. 8.2.3.8 Open the pressure-retaining gas cylinder, connect the confining pressure gas flow, and increase the confining pressure to 0.5~.2MPa. Confining pressure fire Small, according to the porosity and permeability of the core sample, the confining pressure should be 2 to 3 times greater than the flow pressure. 8, 2.3.9 After the confining pressure value stabilizes, apply the flow pressure. According to the permeability and porosity values of the core sample, select the appropriate flow pressure value.
8.2.3.10 When the flow pressure is added to a certain stable pressure, the resistance value gradually increases and stabilizes to a certain value. The water at the lower end of the electrode is discharged from the river with salt water. First reduce the flow pressure to zero, and then reduce the side pressure to zero. After observing that the electrode value is stable, measure and record. The recording format is shown in Table 2 .
8,2.3,11 Turn off the pressure and flow pressure, unload the core sample with the brine blown out by the gas, and remove the filter papers at both ends of the core sample. Put the upper and lower filter papers separately. When using for the first time, the upper and lower filter papers cannot be reversed. 8.2.3.12 Weigh the mass of the core sample and the sealing sleeve after the water is blown out and record it. 8,2.3.13 Stick the filter papers on the upper and lower parts of the core sample, put the core sample into the high-pressure core sample holder again, and measure the first point.
8,2.3,14 Each time the core sample is loaded and unloaded , it must be noted that the placement of the core sample cannot be changed. 8.2.3.15 Turn on the resistivity meter switch and check whether the resistance value is the same as the resistance value before unloading the core sample. 8.2.3.16 Repeat the above measurement method until no water is discharged from the core sample. 9
一ttt
Saturation S
Figure? Schematic diagram of the intersection of core resistivity index and water saturation B Resistivity index I is calculated using formula.
8.4 Water saturation S is calculated using formula 9.
SY/T 5385—91
G21-Gi-Ga
G2-G-Go
Where: G is the mass of the core sample when the core sample hole originally contains 100% brine; G is the mass of the dry core sample;
G21 is the mass of each core sample after the brine in the core sample is discharged from the first to the nth time; G.
is the mass of the sealing sleeve.
8.5 Determine the water saturation index (n) using the resistivity index and water saturation obtained by measurement and calculation. (9)
Use double logarithmic coordinate paper to draw the cross-plot of the resistivity index and saturation of the selected group of cores, as shown in Figure 7. When the minimum. Multiply to find the regression line. The slope of the regression line is the saturation index (),: The intercept on the saturation axis is the lithology coefficient (6). Additional Notes:
This standard was proposed and managed by the Oil Well Logging Professional Standard Promotion Committee. This standard was drafted by the Jianghan Well Logging Research Institute. The main drafter of this standard was Liu Jiqiong.2 Oil-driven water method
The measurement device of oil-driven water method is shown in Figure 5.
8.2.2.1 Use resistivity meter and high-pressure core holder to measure. 8.2.2.2 Use filter paper to couple the two ends of the core sample. There is no floating (salt) water on the surface of the filter paper. 8.2.2.3 There is no floating (salt) water on the surface of the core sample. 8.2.2.4 Put the core sample into the rubber sleeve, and then put it into the high-pressure core sample holder together with the rubber sleeve. The electrodes at both ends and the two ends of the core sample must be in close contact.
SY/T5385-91
Figure 5 Diagram of oil-driven water method measurement device
8.2.2.5 The water outlet at the lower end of the electrode is placed in a graduated measuring tube. 8.2.2.6 Measure the resistivity of the salt water core sample without applying pressure. Core sample holder
Double plunger
Micro pump
Scale gauge tube
8.2.2.7 Use the high efficiency column ultra-micro pump to control the oil pressure system. First, add a confining pressure of 1 to 7 MPa. The value of the confining pressure depends on the porosity and permeability of different core samples. The pressure should be 2 to 3 times higher than the flow pressure. 8.2.2.8 After the confining pressure stabilizes, turn off the confining pressure and apply the flow pressure. The value of the flow pressure depends on the porosity and permeability of the core sample being measured.
8,2.2.9 When the flow pressure increases, it can be seen from the resistivity meter that the resistance value is gradually increasing and stabilizing, and salt water is discharged from the lower port of the electrode. When the flow pressure stabilizes to a certain pressure, turn off the flow pressure, wait for the resistance value to stabilize, and the water output to stabilize, record the resistance value, temperature value t1, the volume of brine in the scale metering tube and the flow pressure value at this time. The first point measurement is completed. B.2.2.10, for the measurement of the second point, continue to increase the flow pressure appropriately, and after the flow pressure, resistance value and water output are stable, record the resistance value, temperature value, the volume of brine in the scale metering tube and the flow pressure at this time. The second point measurement is completed. For each subsequent point, repeat the method of 8.2, 2.9 and this article until no water is discharged from the core sample. The data recording format is shown in Table 2.
8.2.2.11 The calculation formulas for the resistivity index I and the water saturation S are 1
I: P
The resistivity of the core sample measured after oil-water displacement, 9m. S=
--the amount of brine discharged from the core sample, ml, Wuzhong:
and number,
measurer,
rock sample number:
SY/T 5385-91
Table 2 Saturation index measurement record (format) R
V——pore volume of core sample, cm.
8.2.3 Air blowing method
The schematic diagram of the air blowing method measurement device is shown in Figure 6). 8.2,3.1 Use high pressure core sample holder and resistivity meter for measurement (TE
Qusuo Jiao Tester
High Pressure Core
Sample Fire Holder
Figure 6 Schematic diagram of air blowing measurement device
8,2.3.2 The measurement and requirements are the same as those in Articles 81 and 8.2.2. 8.2.3.3 The two ends of the core sample are coupled with filter paper, and there is no floating (salt) water on the surface of the filter paper. 8.2.3.4 Remove the floating (salt) water on the surface of the core. 8
SY/T 5385--91
8.2.3.5 Use a balance to weigh the wet weight of the core sample and the mass of the sealing sleeve, and make a record. 8,2.3.6 Place the core sample in the sealing sleeve. Stick filter paper on both ends of the core sample, and then place it together with the sealing sleeve into the high-pressure core sample holder. Make the core sample in close contact with the electrodes at both ends. 8.2.3,7 Measure the resistivity βt of the salt water core sample when no pressure is applied. 8.2.3.8 Open the pressure-retaining gas cylinder, connect the confining pressure gas flow, and increase the confining pressure to 0.5~.2MPa. Confining pressure fire Small, according to the porosity and permeability of the core sample, the confining pressure should be 2 to 3 times greater than the flow pressure. 8, 2.3.9 After the confining pressure value stabilizes, apply the flow pressure. According to the permeability and porosity values of the core sample, select the appropriate flow pressure value.
8.2.3.10 When the flow pressure is added to a certain stable pressure, the resistance value gradually increases and stabilizes to a certain value. The water at the lower end of the electrode is discharged from the river with salt water. First reduce the flow pressure to zero, and then reduce the side pressure to zero. After observing that the electrode value is stable, measure and record. The recording format is shown in Table 2 .
8,2.3,11 Turn off the pressure and flow pressure, unload the core sample with the brine blown out by the gas, and remove the filter papers at both ends of the core sample. Put the upper and lower filter papers separately. When using for the first time, the upper and lower filter papers cannot be reversed. 8.2.3.12 Weigh the mass of the core sample and the sealing sleeve after the water is blown out and record it. 8,2.3.13 Stick the filter papers on the upper and lower parts of the core sample, put the core sample into the high-pressure core sample holder again, and measure the first point.
8,2.3,14 Each time the core sample is loaded and unloaded , it must be noted that the placement of the core sample cannot be changed. 8.2.3.15 Turn on the resistivity meter switch and check whether the resistance value is the same as the resistance value before unloading the core sample. 8.2.3.16 Repeat the above measurement method until no water is discharged from the core sample. 9
一ttt
Saturation S
Figure? Schematic diagram of the intersection of core resistivity index and water saturation B Resistivity index I is calculated using formula.
8.4 Water saturation S is calculated using formula 9.
SY/T 5385—91
G21-Gi-Ga
G2-G-Go
Where: G is the mass of the core sample when the core sample hole originally contains 100% brine; G is the mass of the dry core sample;
G21 is the mass of each core sample after the brine in the core sample is discharged from the first to the nth time; G.
is the mass of the sealing sleeve.
8.5 Determine the water saturation index (n) using the resistivity index and water saturation obtained by measurement and calculation. (9)
Use double logarithmic coordinate paper to draw the cross-plot of the resistivity index and saturation of the selected group of cores, as shown in Figure 7. When the minimum. Multiply to find the regression line. The slope of the regression line is the saturation index (),: The intercept on the saturation axis is the lithology coefficient (6). Additional Notes:
This standard was proposed and managed by the Oil Well Logging Professional Standard Promotion Committee. This standard was drafted by the Jianghan Well Logging Research Institute. The main drafter of this standard was Liu Jiqiong.2 Oil-driven water method
The measurement device of oil-driven water method is shown in Figure 5.
8.2.2.1 Use resistivity meter and high-pressure core holder to measure. 8.2.2.2 Use filter paper to couple the two ends of the core sample. There is no floating (salt) water on the surface of the filter paper. 8.2.2.3 There is no floating (salt) water on the surface of the core sample. 8.2.2.4 Put the core sample into the rubber sleeve, and then put it into the high-pressure core sample holder together with the rubber sleeve. The electrodes at both ends and the two ends of the core sample must be in close contact.
SY/T5385-91
Figure 5 Diagram of oil-driven water method measurement device
8.2.2.5 The water outlet at the lower end of the electrode is placed in a graduated measuring tube. 8.2.2.6 Measure the resistivity of the salt water core sample without applying pressure. Core sample holder
Double plunger
Micro pump
Scale gauge tube
8.2.2.7 Use the high efficiency column ultra-micro pump to control the oil pressure system. First, add a confining pressure of 1 to 7 MPa. The value of the confining pressure depends on the porosity and permeability of different core samples. The pressure should be 2 to 3 times higher than the flow pressure. 8.2.2.8 After the confining pressure stabilizes, turn off the confining pressure and apply the flow pressure. The value of the flow pressure depends on the porosity and permeability of the core sample being measured.
8,2.2.9 When the flow pressure increases, it can be seen from the resistivity meter that the resistance value is gradually increasing and stabilizing, and salt water is discharged from the lower port of the electrode. When the flow pressure stabilizes to a certain pressure, turn off the flow pressure, wait for the resistance value to stabilize, and the water output to stabilize, record the resistance value, temperature value t1, the volume of brine in the scale metering tube and the flow pressure value at this time. The first point measurement is completed. B.2.2.10, for the measurement of the second point, continue to increase the flow pressure appropriately, and after the flow pressure, resistance value and water output are stable, record the resistance value, temperature value, the volume of brine in the scale metering tube and the flow pressure at this time. The second point measurement is completed. For each subsequent point, repeat the method of 8.2, 2.9 and this article until no water is discharged from the core sample. The data recording format is shown in Table 2.
8.2.2.11 The calculation formulas for the resistivity index I and the water saturation S are 1
I: P
The resistivity of the core sample measured after oil-water displacement, 9m. S=
--the amount of brine discharged from the core sample, ml, Wuzhong:
and number,
measurer,
rock sample number:
SY/T 5385-91
Table 2 Saturation index measurement record (format) R
V——pore volume of core sample, cm.
8.2.3 Air blowing method
The schematic diagram of the air blowing method measurement device is shown in Figure 6). 8.2,3.1 Use high pressure core sample holder and resistivity meter for measurement (TE
Qusuo Jiao Tester
High Pressure Core
Sample Fire Holder
Figure 6 Schematic diagram of air blowing measurement device
8,2.3.2 The measurement and requirements are the same as those in Articles 81 and 8.2.2. 8.2.3.3 The two ends of the core sample are coupled with filter paper, and there is no floating (salt) water on the surface of the filter paper. 8.2.3.4 Remove the floating (salt) water on the surface of the core. 8
SY/T 5385--91
8.2.3.5 Use a balance to weigh the wet weight of the core sample and the mass of the sealing sleeve, and make a record. 8,2.3.6 Place the core sample in the sealing sleeve. Stick filter paper on both ends of the core sample, and then place it together with the sealing sleeve into the high-pressure core sample holder. Make the core sample in close contact with the electrodes at both ends. 8.2.3,7 Measure the resistivity βt of the salt water core sample when no pressure is applied. 8.2.3.8 Open the pressure-retaining gas cylinder, connect the confining pressure gas flow, and increase the confining pressure to 0.5~.2MPa. Confining pressure fire Small, according to the porosity and permeability of the core sample, the confining pressure should be 2 to 3 times greater than the flow pressure. 8, 2.3.9 After the confining pressure value stabilizes, apply the flow pressure. According to the permeability and porosity values of the core sample, select the appropriate flow pressure value.
8.2.3.10 When the flow pressure is added to a certain stable pressure, the resistance value gradually increases and stabilizes to a certain value. The water at the lower end of the electrode is discharged from the river with salt water. First reduce the flow pressure to zero, and then reduce the side pressure to zero. After observing that the electrode value is stable, measure and record. The recording format is shown in Table 2 .
8,2.3,11 Turn off the pressure and flow pressure, unload the core sample with the brine blown out by the gas, and remove the filter papers at both ends of the core sample. Put the upper and lower filter papers separately. When using for the first time, the upper and lower filter papers cannot be reversed. 8.2.3.12 Weigh the mass of the core sample and the sealing sleeve after the water is blown out and record it. 8,2.3.13 Stick the filter papers on the upper and lower parts of the core sample, put the core sample into the high-pressure core sample holder again, and measure the first point.
8,2.3,14 Each time the core sample is loaded and unloaded , it must be noted that the placement of the core sample cannot be changed. 8.2.3.15 Turn on the resistivity meter switch and check whether the resistance value is the same as the resistance value before unloading the core sample. 8.2.3.16 Repeat the above measurement method until no water is discharged from the core sample. 9
一ttt
Saturation S
Figure? Schematic diagram of the intersection of core resistivity index and water saturation B Resistivity index I is calculated using formula.
8.4 Water saturation S is calculated using formula 9.
SY/T 5385—91
G21-Gi-Ga
G2-G-Go
Where: G is the mass of the core sample when the core sample hole originally contains 100% brine; G is the mass of the dry core sample;
G21 is the mass of each core sample after the brine in the core sample is discharged from the first to the nth time; G.
is the mass of the sealing sleeve.
8.5 Determine the water saturation index (n) using the resistivity index and water saturation obtained by measurement and calculation. (9)
Use double logarithmic coordinate paper to draw the cross-plot of the resistivity index and saturation of the selected group of cores, as shown in Figure 7. When the minimum. Multiply to find the regression line. The slope of the regression line is the saturation index (),: The intercept on the saturation axis is the lithology coefficient (6). Additional Notes:
This standard was proposed and managed by the Oil Well Logging Professional Standard Promotion Committee. This standard was drafted by the Jianghan Well Logging Research Institute. The main drafter of this standard was Liu Jiqiong.
and number,
measurer,
rock sample number:
SY/T 5385-91
Table 2 Saturation index measurement record (format) R
V——pore volume of core sample, cm.
8.2.3 Air blowing method
The schematic diagram of the air blowing method measurement device is shown in Figure 6). 8.2,3.1 Use high pressure core sample holder and resistivity meter for measurement (TE
Qusuo Jiao Tester
High Pressure Core
Sample Fire Holder
Figure 6 Schematic diagram of air blowing measurement device
8,2.3.2 The measurement and requirements are the same as those in Articles 81 and 8.2.2. 8.2.3.3 The two ends of the core sample are coupled with filter paper, and there is no floating (salt) water on the surface of the filter paper. 8.2.3.4 Remove the floating (salt) water on the surface of the core. 8
SY/T 5385--91
8.2.3.5 Use a balance to weigh the wet weight of the core sample and the mass of the sealing sleeve, and make a record. 8,2.3.6 Place the core sample in the sealing sleeve. Stick filter paper on both ends of the core sample, and then place it together with the sealing sleeve into the high-pressure core sample holder. Make the core sample in close contact with the electrodes at both ends. 8.2.3,7 Measure the resistivity βt of the salt water core sample when no pressure is applied. 8.2.3.8 Open the pressure-retaining gas cylinder, connect the confining pressure gas flow, and increase the confining pressure to 0.5~.2MPa. Confining pressure fire Small, according to the porosity and permeability of the core sample, the confining pressure should be 2 to 3 times greater than the flow pressure. 8, 2.3.9 After the confining pressure value stabilizes, apply the flow pressure. According to the permeability and porosity values of the core sample, select the appropriate flow pressure value.
8.2.3.10 When the flow pressure is added to a certain stable pressure, the resistance value gradually increases and stabilizes to a certain value. The water at the lower end of the electrode is discharged from the river with salt water. First reduce the flow pressure to zero, and then reduce the side pressure to zero. After observing that the electrode value is stable, measure and record. The recording format is shown in Table 2 .
8,2.3,11 Turn off the pressure and flow pressure, unload the core sample with the brine blown out by the gas, and remove the filter papers at both ends of the core sample. Put the upper and lower filter papers separately. When using for the first time, the upper and lower filter papers cannot be reversed. 8.2.3.12 Weigh the mass of the core sample and the sealing sleeve after the water is blown out and record it. 8,2.3.13 Stick the filter papers on the upper and lower parts of the core sample, put the core sample into the high-pressure core sample holder again, and measure the first point.
8,2.3,14 Each time the core sample is loaded and unloaded , it must be noted that the placement of the core sample cannot be changed. 8.2.3.15 Turn on the resistivity meter switch and check whether the resistance value is the same as the resistance value before unloading the core sample. 8.2.3.16 Repeat the above measurement method until no water is discharged from the core sample. 9
一ttt
Saturation S
Figure? Schematic diagram of the intersection of core resistivity index and water saturation B Resistivity index I is calculated using formula.
8.4 Water saturation S is calculated using formula 9.
SY/T 5385—91
G21-Gi-Ga
G2-G-Go
Where: G is the mass of the core sample when the core sample hole originally contains 100% brine; G is the mass of the dry core sample;
G21 is the mass of each core sample after the brine in the core sample is discharged from the first to the nth time; G.
is the mass of the sealing sleeve.
8.5 Determine the water saturation index (n) using the resistivity index and water saturation obtained by measurement and calculation. (9)
Use double logarithmic coordinate paper to draw the cross-plot of the resistivity index and saturation of the selected group of cores, as shown in Figure 7. When the minimum. Multiply to find the regression line. The slope of the regression line is the saturation index (),: The intercept on the saturation axis is the lithology coefficient (6). Additional Notes:
This standard was proposed and managed by the Oil Well Logging Professional Standard Promotion Committee. This standard was drafted by the Jianghan Well Logging Research Institute. The main drafter of this standard was Liu Jiqiong.
And number,
Measurer,
Rock sample number:
SY/T 5385-91
Table 2 Saturation index measurement record (format) R
V——Pore volume of core sample, cm.
8.2.3 Air blowing method
The schematic diagram of the air blowing method measurement device is shown in Figure 6). 8.2,3.1 Use high pressure core sample holder and resistivity meter for measurement (TE
Qusuo Jiao Tester
High Pressure Core
Sample Fire Holder
Figure 6 Schematic diagram of air blowing measurement device
8,2.3.2 The measurement and requirements are the same as those in Articles 81 and 8.2.2. 8.2.3.3 The two ends of the core sample are coupled with filter paper, and there is no floating (salt) water on the surface of the filter paper. 8.2.3.4 Remove the floating (salt) water on the surface of the core. 8
SY/T 5385--91
8.2.3.5 Use a balance to weigh the wet weight of the core sample and the mass of the sealing sleeve, and make a record. 8,2.3.6 Place the core sample in the sealing sleeve. Stick filter paper on both ends of the core sample, and then place it together with the sealing sleeve into the high-pressure core sample holder. Make the core sample in close contact with the electrodes at both ends. 8.2.3,7 Measure the resistivity βt of the salt water core sample when no pressure is applied. 8.2.3.8 Open the pressure-retaining gas cylinder, connect the confining pressure gas flow, and increase the confining pressure to 0.5~.2MPa. Confining pressure fire Small, according to the porosity and permeability of the core sample, the confining pressure should be 2 to 3 times greater than the flow pressure. 8, 2.3.9 After the confining pressure value stabilizes, apply the flow pressure. According to the permeability and porosity values of the core sample, select the appropriate flow pressure value.
8.2.3.10 When the flow pressure is added to a certain stable pressure, the resistance value gradually increases and stabilizes to a certain value. The water at the lower end of the electrode is discharged from the river with salt water. First reduce the flow pressure to zero, and then reduce the side pressure to zero. After observing that the electrode value is stable, measure and record. The recording format is shown in Table 2 .
8,2.3,11 Turn off the pressure and flow pressure, unload the core sample with the brine blown out by the gas, and remove the filter papers at both ends of the core sample. Put the upper and lower filter papers separately. When using for the first time, the upper and lower filter papers cannot be reversed. 8.2.3.12 Weigh the mass of the core sample and the sealing sleeve after the water is blown out and record it. 8,2.3.13 Stick the filter papers on the upper and lower parts of the core sample, put the core sample into the high-pressure core sample holder again, and measure the first point.
8,2.3,14 Each time the core sample is loaded and unloaded , it must be noted that the placement of the core sample cannot be changed. 8.2.3.15 Turn on the resistivity meter switch and check whether the resistance value is the same as the resistance value before unloading the core sample. 8.2.3.16 Repeat the above measurement method until no water is discharged from the core sample. 9
一ttt
Saturation S
Figure? Schematic diagram of the intersection of core resistivity index and water saturation B Resistivity index I is calculated using formula.
8.4 Water saturation S is calculated using formula 9.
SY/T 5385—91
G21-Gi-Ga
G2-G-Go
Wherein: G is the mass of the core sample when the core sample hole originally contains 100% brine; G is the mass of the dry core sample;
G21 is the mass of each core sample after the brine in the core sample is discharged from the 1st to the nth time; G.
is the mass of the sealing sleeve.
8.5 Determine the water saturation index (n) using the resistivity index and water saturation obtained from the measurement. (9)
Use double logarithmic coordinate paper to draw a cross-plot of the resistivity index and saturation of a group of selected cores, as shown in Figure 7. The regression line is obtained by multiplication. The slope of the regression line is the saturation index (), and the intercept on the saturation axis is the lithology coefficient (6). Additional notes:
This standard is proposed and managed by the Oil Well Logging Professional Standard Promotion Committee. This bid was drafted by Tuishan Jianghan Well Logging Research Institute. The main drafter of this standard is Liu Jiqiong.
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