SY/T 5590-1993 Performance evaluation method of gel profile control agent
Some standard content:
SY/T5590--93 Petroleum and Natural Gas Industry Standard of the People's Republic of China
Performance Evaluation Method of Gel Profile Control Agent
Published on March 27, 1993
Ministry of Energy of the People's Republic of China
Implementation on September 1, 1993
1 Subject Content and Scope of Application
Performance Evaluation Method of Gel Profile Control Agent of the People's Republic of China
This standard specifies the relevant technical spectrum, symbols and indoor performance evaluation methods of gel profile control agents. SY/T 5590--93
This standard is applicable to the indoor evaluation of the performance of single-liquid gel profile control agents with polyacrylamide polymer as the main agent and single-liquid profile control agents with acrylamide as the main agent. Other similar single-liquid gel profile control agents can also be implemented as a reference. 2 Reference standards
SY5336 Recommended practices for conventional core analysis
3 Technical terms, symbols and unitswww.bzxz.net
3.1 Profile control agent apparent viscosity-time curve
The curve of the apparent viscosity of the profile control agent () changing with time (t) at a given temperature. 3.2 Profile control agent plugging rate
Under the same conditions, the percentage (%) of the reduction in the water phase permeability of the core after plugging. 3.3 Profile control agent breakthrough pressure
Under the test conditions specified in this standard, pressure is applied to the plugged core using water as the displacement wave. When the first drop of liquid drips from the core outlet and liquid continues to flow out thereafter, the pressure at the core inlet is the breakthrough pressure of the profile control agent, expressed as P, MPa. 3.4 Standard breakthrough pressure of profile control agent
The breakthrough pressure of the profile control agent in a core with a water phase permeability of 1um and a length of 1cm, expressed as P, MPa(cm)-1. 3.5 Profile control agent strength behavior index
A parameter indicating the degree of influence of the core water phase permeability (K) on the breakthrough pressure of the profile control agent, expressed as B, a dimensionless quantity. 3.6 Profile control agent scour resistance characteristic curve
The curve of the change of the water phase permeability (Kw) of the plugged core with the volume of the driven liquid (PV) under the experimental conditions specified in this standard. 3.7 Profile control agent thermal qualitative curve
The curve of the change of the residual resistance coefficient (RR) of the profile control agent with time at the temperature and pressure specified in this standard. 4. Instruments, materials and test equipment a. Capillary viscometer (0.6mIn), six-speed rotary viscometer, RV-2 or RV-3 viscometer, etc. b. Vacuum pump c. Vacuum coal dryer d. Constant temperature bath e. Analytical balance: sensitivity 0.001g f. High-pressure flow pump: maximum working pressure 30MPa9, core holder, maximum working pressure 30MPa, core sleeve 2.5cm, length 8.0～10.0cm adjustable, ring pressure higher than working pressure 5%, approved by the Ministry of Energy of the People's Republic of China on March 27, 1993, implemented on September 1, 1993 SY/T 5590-93 h. Core: Take the natural core from the stratum to be profiled. The sampling method and core processing method must comply with the provisions of Article 4.3.2, 4.5 and 4.6 of SY5336. The core diameter is 2.5±0.2cm and the length is 8.0~10.0cm. It is recommended to use quartz sand (or limestone oil sand) core cemented with epoxy resin, which is the same as the natural core. i Formation water or simulated water: Use real formation water or simulated water that meets the requirements of the profile control agent product standard, filter it with double-layer filter paper, and determine its density (-) and viscosity (-) at the test temperature. j. Kerosene: Ordinary industrial kerosene is dehydrated and decolorized by anhydrous clay or anhydrous silica gel for 24 hours, and then filtered with double-layer filter paper. k. Core test device, see Figure 1.
.5 Sample preparation
According to the preparation requirements of the profile control agent product standard, prepare at least 20L of the profile control agent main agent solution at a time. After fully dissolved, filter it with a sand core funnel.
6 General performance evaluation of profile control agent
6.1 Apparent viscosity-time curve and compatibility determination6.1.1 According to the thickness, porosity and designed plugging radius of the proposed profile control formation, calculate the theoretical liquid volume (m\) of the profile control agent, and calculate the theoretical squeeze displacement (m\/min) and theoretical squeeze time (h) according to the flood water intensity and injection pressure. 6.1.2 Mix the profile control agent with the proposed profile control formation water or simulated water at a volume ratio of 1:0.25 and 1:0.5, and take 500mL of each and put it into three wide-mouth bottles with mushroom mouths, and then stack them in a constant temperature water bath adjusted to the highest well site temperature (recommended 40℃). After 20 minutes, open the rotation viscometer to measure the apparent viscosity once. Thereafter, measure the apparent viscosity once at the same shear rate every 0.5~61 until the theoretical squeeze time is measured. Two parallel tests are performed for each type of profile control agent. At the same reaction time, the relative error of the corresponding apparent viscosity values of each group of tests should not be greater than 5%. 6.1.3 Draw the curve of the apparent viscosity of each test over time in rectangular coordinates, and then average the corresponding viscosities in the two groups of tests to obtain three apparent viscosity-time curves. The degree of proximity of the three curves indicates the compatibility of the profile control agent with the formation water. 6.2 Determination of gelation time
Place 500mL of the agent in two wide-mouth bottles with ground mouths, seal them, and then place them in a constant temperature bath adjusted to the temperature of the intended profile control formation, and measure the apparent viscosity-time curve according to Section 6.1.2. The time it takes for the curve to have an inflection point is taken as the gelation time of the profile control agent. 7 Core test
The following core tests are all carried out at the temperature of the intended profile control formation. 7.1 Core preparation
7.1.1 Determination of core pore volume
The method for determining the core pore volume shall comply with the provisions of Article 6.1.2 of SY5336. 7.1.2 Determination of core water phase permeability
Connect the process according to Figure 1, install the core, keep the temperature constant for 30min, and drive water into the core with kerosene at the selected displacement. After driving 10PV of water, measure the actual flow base once every 5min and calculate the permeability (um). At least 6 permeability values shall be measured, and the relative error between each value shall not exceed 3%. Take the average value as the water phase permeability of the core, and calculate the corresponding water flow rate value (μm). 7.2 Determination of pumping performance of profile control agent
Take two cores with the same average water phase permeability as the intended profile control formation, measure them according to Article 7.1.2, and then drive the high viscosity profile control agent stock solution, whose apparent viscosity-time curve has been measured according to Article 6.1.2, into the cores with kerosene at 80% formation fracture strength. Record the flow rate (mL/min) when driving in 2PV profile control agent. The flow rate indicates the pumping performance of the profile control agent. Collect data according to Table 1. 7.3 Determination of breakthrough pressure
7.3.1 Take a core with the same average water phase permeability as the intended profile control formation: measure the water phase permeability according to Article 7.1.2, keep the pump displacement unchanged, and drive 2PV of profile control agent into the core with the same flow direction. Close the inlet and outlet valves, and let it stand for solidification according to the gelation time of the profile control agent 2
measured in Article 6.2.
Adjustment name,
Core number
Tester,
Water phase permeability
SY/T 5590—93
Table 1 Pumping performance measurement record
Simulation temperature:
Formation fracture pressure
Reviewer:
Injection pressure
Profile control agent flow rate
mL/min
Date:
7.3.2 Take out the core, remove the clots in the core end face, plug, and all pipelines and valves, and reinstall them. However, only the plug is retained at the outlet end, and no valves and auxiliary pipelines are installed, so that the core chamber is directly exposed to the atmosphere. Use filter paper to absorb the liquid in the outlet plug hole, and use water to displace the core in the same flow direction as when measuring the water phase permeability. The displacement pressure starts from zero, and is continuously increased at a rate of 0.05MPa/min. After reaching 1MPa, the pressure is continuously increased at a rate of 0.10M.Pa/min. After reaching 2MPa, the pressure is increased at a rate of 0.20MPa/min until the first drop of liquid flows out of the plug hole at the outlet end, and thereafter liquid continues to flow out. At this time, the reading of the pressure gauge at the inlet end is the pressure of the profile control agent.
7.3.3 Taking the average water phase permeability of the formation to be profiled as the base point, the permeability is increased or decreased in sequence with a permeability difference of 0.2 to 0.4m to obtain a permeability series from low to high. The series contains at least 6 cores with different permeabilities. According to Article 7.3.2, the breakthrough pressure of the profile control agent in these cores is measured respectively, and the data is collected according to Table 2: Table 2 Record of breakthrough pressure measurement of profile control agent
Name of profile control agent.
Core number
Tester.
Water phase permeability
Simulation temperature,
Core decay
Reviewer
Breakthrough pressure
R period:
7.3.4. Draw a breakthrough pressure-permeability curve in double logarithmic coordinates, which should be a true line. Draw a vertical line through the horizontal axis at the point 11m on the horizontal axis to intersect the breakthrough pressure-permeability curve. The vertical coordinate value of the intersection point divided by the core length is the standard breakthrough pressure. The slope of the breakthrough pressure-permeability curve is the strength behavior index of the profile control agent, see Figure 2. 7.4 Determination of the scour resistance characteristic curve
In Article 7.3.2, after the profile control agent is broken through, the pump displacement is set to the same as when measuring the water phase permeability, and the pressure is still increased at the speed of breakthrough. When the actual flow reaches the set displacement and the pump pressure is stable, calculate the volume of the driven fluid and the corresponding water phase permeability value every 10 minutes. Displace at least 30P, and draw a permeability-displacement volume curve in the right angle mark. .5 Determination of residual resistance coefficient and plugging rate In Article 7.4, if a stable water permeability value can be obtained, find the stable value from the permeability displacement fluid volume curve, SY/T 5590-93
and find the corresponding water mobility value (without w): calculate the plugging value and residual resistance coefficient of the profile control agent. Collect data according to Table 3. Table 3 Determination of plugging rate and residual resistance coefficient Record the name of the profile control agent.
Core number
Tester,
.6 Determination of thermal stability
μm*/(mPa-s)
Auditor:
Simulation temperature,
μm\/(mPa+s)
Date,
Plug rate%
7.6.1 In Article 7.4, after the scour resistance characteristic curve is determined, close the core model. At the test temperature, measure the residual resistance coefficient value once every 15 days using the same method. Measure for at least 6 months. 7.6.2 Draw a curve of the residual resistance coefficient changing with time in rectangular coordinates. Perform two parallel tests on the same profile control agent and take the average value to obtain the thermal stability curve of the profile control agent.
1. High-pressure horizontal flow pump 2. Annular pressure container
. Pressure gauge
4. Profile control agent container
3. Kerosene device
7. Core holder 8. Effluent receiver
5. Water container
9. Differential pressure sensor 10. Differential pressure display
11. Differential pressure recorder
12. Insulation box
Figure 1 Schematic diagram of core displacement process
Additional instructions,
SY/T 5590--93
K., μm2
Figure 2 Breakthrough pressure-permeability line
This standard is proposed and managed by the Oilfield Chemistry Professional Standardization Technical Committee. This standard is drafted by the Exploration and Development Research Institute of Changqing Petroleum Exploration Bureau. The main drafters of this standard are Ma Guangyan, Pang Suishe and Yang Shengzhu.
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