Some standard content:
Record number: 3078-1999
Petroleum and natural gas industry standard of the People's Republic of China SY/T 5154-1999
Sampling procedures for hydrocarbon reservoir fluids1999-05-17 Issued
State Bureau of Petroleum and Chemical Industry
Implementation on 1999-12-01
Selection of sampling wells
Adjustment of sampling well working system
Oil well sampling methods
Sampling methods for condensate gas wells
Sampling methods for wet gas wells
Sampling methods for dry gas wells
Sampling methods for ultra-low saturation pressure reservoirs
Sample protection:
Adjustment of oil and gas well working system and sampling records·12 Sample quality inspection·
Appendix A (Appendix to the standard)||tt| |Appendix B (Appendix to the standard)
Appendix C (Appendix to the standard)
Relationship table between inflation pressure and number of flushing times
Record format for oil and gas well adjustment and sampling Drying tube production and use requirements
SY/T5154—1999
SY515487 (Recommended Practice for Sampling of Oil and Gas Reservoir Fluids) mainly stipulates the "downhole" sampling method for reservoir fluids, and only briefly stipulates the sampling method for condensate gas reservoirs and volatile oil reservoirs. With the further deepening of petroleum exploration and scientific research, a large number of condensate gas reservoirs and volatile oil reservoirs have been discovered. It is necessary to propose a more detailed and operational fluid sampling method for this type of oil (gas) reservoir. At the same time, some clauses that should be revised in SY5154-87 were also found in practice. For this reason, SY5154-87 was revised, and the name of the revised standard was changed to "Oil and Gas Reservoir Fluid Sampling Method". The revised standard adds requirements for separator parameter determination, metering accuracy, sample quality inspection and sample protection, which has better feasibility for the implementation of on-site sampling, wider applicability to different types of oil and gas reservoirs, and makes the sampling of formation fluids more systematic and standardized. This standard shall replace SY5154-87 from the date of entry into force. Appendix A, Appendix B and Appendix C of this standard are all appendices of the standard. This standard was proposed by China National Petroleum Corporation. This standard is under the jurisdiction of the Oil and Gas Field Development Professional Standardization Committee. The drafting unit of this standard: Petroleum Recovery Research Institute, Petroleum Exploration and Development Research Institute. The drafters of this standard are Sun Wenyue, Zheng Xitan
This standard was first issued in 1987.
1 Scope
Petroleum and Natural Gas Industry Standard of the People's Republic of China Sampling procedures for hydrocarbon reservoir fluidsSY/T 5154---1999
Replacement SY5154-87
This standard specifies the adjustment of the working system of oil (gas) reservoir fluid sampling wells, the two sampling methods of "parallel" and "separator*" and technical requirements, and specifies the relevant information to be obtained during the adjustment and sampling of oil and gas wells. This standard applies to the sampling of general crude oil, volatile oil, condensate gas, wet gas and fluids in gas reservoirs. 2 Definitions
This standard adopts the following definitions.
2.1 Pre-setting liquid
A liquid that replaces the sample, which does not affect the chemical properties of the sample. 2.2 Critical state of hydrocarbon system
The physical state in which the gas and liquid of the hydrocarbon system cannot be distinguished, that is, all the properties of the coexisting gas phase and liquid phase become indistinguishable. 2.3 Oil in the oil tank
The liquid hydrocarbon (referring to crude oil or condensate under standard conditions) that enters the oil storage tank after the hydrocarbon fluid produced by oil and gas is processed by the oil and gas separation system.
2.4 Production gas-oil ratio
The ratio of the gas production of the first-stage separator under standard conditions to the oil production of the oil tank. 2.5 Separator gas-oil ratio
The ratio of the gas production of the first-stage separator under standard conditions to the oil (or condensate) production under separator conditions. 2.6 Separator oil-gas ratio
The ratio of the gas volume under standard state separated after the separator oil (or condensate) enters the oil tank to the oil volume in the oil tank. 2.7 Standard state
refers to the conditions of 0.101MPa and 20℃.
3 Sampling well selection
Oil (gas) wells that can adjust the bottom hole pressure to a pressure higher than the expected original bubble (dew) point for production. 3.1
3.2 Oil (gas) wells that do not produce water or whose water production rate does not exceed 5%. 3.3 Oil (gas) wells whose gas-oil ratio and relative density of crude oil on the ground are representative of those in the surrounding wells. 3.4 Wells with relatively high oil (gas) production index in the surrounding wells. 3.5 Oil (gas) wells with stable oil (gas) flow and no intermittent phenomenon. 3.6 Oil (gas) wells with complete and reliable wellhead oil and gas measurement equipment and processes that meet the sampling requirements. 3.7 Oil (gas) wells with no cross-grooving between cement-sealed well sections. 3.8 It is best to be a self-flowing well.
Approved by the State Administration of Petroleum and Chemical Industry on May 17, 1999 and implemented on December 1, 1999
4 Adjustment of sampling well work system
4.1 Adjustment of oil wells
4.1.1 Adjustment of self-flowing oil wells
SY/T5154—1999
4.1.1.1 Adjustment is made based on the estimated ground-saturation pressure difference, rock properties and reservoir fluid properties, and considering the length of the production period. The main method of oil well adjustment is to gradually reduce the oil and gas production. Drain the non-representative fluid near the wellbore, and make sure that the reservoir fluid flows into the wellbore above the bubble point. Each time the production is reduced by 30% to 50%. After the gas-oil ratio becomes stable (gas-oil ratio fluctuation is less than 5%), it will be reduced to the next level until the stable gas-oil ratio no longer decreases with the change of production. 4.1.1.2 Analysis of phenomena in the adjustment of self-flowing oil wells: The changes in the gas-oil ratio during the adjustment of self-flowing oil wells should be analyzed in detail. If the gas-oil ratio increases after the production reduction, it indicates that the oil well has gas and oil layers producing at the same time, and this type of well should not be selected for sampling; if the stable gas-oil ratio after the production reduction is lower than that before the production reduction, it indicates that the fluid in the formation around the well casing has changed before the production reduction. When this happens, the production should be further reduced. After each production reduction, the self-flowing should continue until the gas-oil ratio is stable. 4.1.2 Adjustment of pumping wells
4.1.2.1 The purpose of pumping well adjustment and the criteria for judging the adjustment work are the same as those of self-flowing oil wells. 4.1.2.2 Precautions for adjustment of pumping wells:
a) Generally, sampling is not performed in pumping wells. Because the production of pumping wells is not easy to change, the pump and sucker rod must be pulled out when sampling downhole; in addition, it is not easy to measure the bottom hole pressure of pumping wells. b) If the surface sampling method is used, the sampling is carried out after adjustment and stabilization and production for a few days. If the downhole sampling method is used, the sucker rod and pump are pulled out after adjustment, and the oil well is sucked at a low speed to eliminate the non-representative oil accumulation at the bottom of the well, and then the sampler is lowered to the sampling point for sampling. 4.2 Adjustment of volatile oil wells
4.2.1 Adjustment of volatile oil wells is particularly difficult. If it has been recognized from early production data that the reservoir fluid belongs to a volatile reservoir, sampling must be carried out as soon as possible after opening and production.
4.2.2 This type of oil well is also adjusted by the step-by-step production reduction method, but the sampling conditions should be more strictly controlled. 4.3 Adjustment of condensate gas wells
4.3.1 The adjustment of condensate gas wells adopts the step-by-step production reduction method to exclude non-representative hydrocarbons. Each time the production is reduced by about half, the production is continued until the gas-oil ratio is stable (gas-oil ratio fluctuation is less than 5%). Generally, the gas-oil ratio tends to decrease with the production. When the gas-oil ratio does not decrease with the production, the adjustment is completed.
4.3.2 Notes on adjustment of condensate gas wells: When sampling condensate gas wells, the production should be kept high enough to prevent intermittent production, otherwise the oil and gas production and the oil and gas component composition in the separator will be difficult to stabilize. 4.4 Gas Well Adjustment
4.4.1 Under the conditions of the separator, a small amount of liquid phase is precipitated from the gas, which is wet gas. The same method as for condensate gas wells should be used to adjust the working system (see 4, 3), and the same measurement method should be used to determine the stable gas-oil ratio, and then the separator oil and gas samples should be taken for matching analysis. 4.4.2 Natural gas flows into the separator without precipitating liquid phase, which is dry gas. Such gas wells do not need to be adjusted. 4.5 Data to be obtained during adjustment
During the adjustment of oil (gas) wells, the oil casing pressure, oil, gas and water production, separator temperature, pressure and bottom hole flow pressure should be systematically measured and compared in time to determine whether the adjustment purpose has been achieved. 5 Oil well sampling method
5.1 Sampling method selection
The selection of sampling method should consider the fluid type and field conditions. For general oil wells, the downhole sampling method can be used. For oil wells with large water production and oil wells with difficult downhole sampling, the separator sampling method can be used. Before sampling, the gas-oil ratio must be accurately determined.
5.2 Downhole sampling
—2—
5.2.1 Downhole sampler selection
SY/T 5154—1999
Select the type of downhole sampler according to the depth of the well, the viscosity of the fluid, the inclination of the wellbore, and whether serious wax deposition occurs during the production process of the oil well. Impact samplers are generally suitable for oil wells within 1500m, but not suitable for inclined wells and oil with very low viscosity. When using them, special attention should be paid to selecting a suitable heavy hammer. Wall-mounted samplers can be used except for oil wells with serious wax deposition and top drilling. Since the wall-mounted sampler cannot move up and down during the closed sampling, it is not easy to replace the dead oil and is not suitable (except for low-saturated oil reservoirs). Clock samplers are applicable to general wells. As long as the time for the sampler to reach the bottom of the well can be accurately estimated, the sample at the sampling point can be obtained. 5.2.2 Sampling point selection
5.2.2.1 Pressure measurement
Measure the flow pressure and pressure gradient under the working system of downhole sampling. 5.2.2.2 Temperature measurement
The recording downhole thermometer should be used to measure the temperature of the downhole tube, so as to measure the temperature gradient between the downhole tube and the depth, and accurately determine the sampling depth and the temperature in the middle of the oil layer.
If there is no recording downhole thermometer, two highest thermometers (one inverted) can be installed in the temperature measuring hole of the pressure gauge when measuring the pressure recovery curve. The average value of the two thermometers is the temperature value at that depth. The pressure gauge must be lowered to the middle of the oil layer, and the value measured by it can represent the temperature of the oil layer.
5.2.2.3 Determine the sampling point
The bubble point and the bottom water accumulation position are determined according to the pressure gradient curve. The sampling point must be below the bubble point pressure point and above the bottom water accumulation point. 5.2.3 Wellhead device for sampling
The wellhead device should have a sufficiently long blowout preventer, which is equipped with a pressure gauge and a vent valve. Install a wax cleaning gate under the blowout preventer (as shown in Figure 1) so that the normal oil flow will not be affected when loading and unloading the sampler. Use a wire winch to lift and lower the sampler. If an impact sampler is used, a special blowout preventer box for impact sampling must be installed on the upper part of the blowout preventer. 5.2.4 Sampling Procedure
Steps for downhole sampling:
a) Clean and inspect the sampler;
b) Check and install the sampler control mechanism: c) Connect the sampler to the wire and install it in the blowout preventer: d) Lower the sampler to the sampling point;
e) Stay and flush for 10 to 40 minutes, start the controller, and close the upper and lower valves of the sampling tube 1); f) After the preset time of 10 minutes, pull up the sampler; g) Take out the sampler from the blowout preventer;
h) Connect the joint and open the sampler to check the sample quality. 5.2.5 Sampling precautions
5.2.5.1 Before sampling, prepare three or more samplers, carefully check all the sealing packings, clean them, and test whether the control mechanism is effective and flexible.
5.2.5.2 The number of samples to be taken shall be determined according to the analysis requirements. In order to determine whether the sample is qualified, a double sample comparison is required. If there is no quality inspection equipment at the site, more samples should be taken so that they can be sent to the laboratory for inspection, comparison and selection. The samples obtained from the same well shall be treated as a single sample and cannot be used for quality inspection comparison.
5.2.5.3 Sampling should not be done when the well is shut in. After the oil well is adjusted, shut in the well to restore the pressure and measure the pressure recovery curve or static pressure. When lowering the sampler, if it does not affect the speed of lowering, it is also possible not to start production. However, when the sampler reaches the bottom of the sampling point, it should be started and produced with a small flow rate for a period of time (15 to 30 minutes) to allow representative formation fluid to fill the sampling tube. When there is no condition to open the well, the sampler should be moved more than 5 times within 10m above and below the sampling point, and then the sampler should be closed. 1) When sampling with a wall-mounted sampler, after staying and flushing for 30 minutes, move it up and down three times between 20m above the well and the sampling point to close the sampling tube. —3-
SY/T5154—1999
1-Blowout preventer; 2-pressure gauge; 3-vent valve; 4-wax cleaning gate: 5-oil pipe; 6-bottom sampler Figure 1 Schematic diagram of downhole sampling wellhead device
5.2.5.4 The speed of the sampler going down the well is controlled at 30~60m/min according to the conditions of the well. 5.3 Separator sampling
When the oil well is under stable flow conditions, it can be considered that the fluid flowing into the well tube from the bottom and the fluid flowing into the separator from the well tube have the same composition. As long as the gas-oil ratio is accurately measured, stable oil and gas samples are obtained from the separator, and the samples are prepared according to the gas-oil ratio, a representative reservoir fluid sample can be obtained.
The samples are taken from the first-stage separator, and at least two oil and gas samples are taken, and they should be obtained within 2 hours as much as possible. 5.3.1 Equipment and specifications required for separator sampling a) One oil, gas and water three-phase separator equipped with a heating system, with a pressure resistance greater than 6MIPa; select a separator of appropriate capacity based on the maximum daily production of a single well in the oil field in the past; b) Two sets of gas flow meters (generally orifice plate type or critical flow rate type); c) One tube-jacket boiler;
d) Two oil tanks, with a volume greater than 2m2;
e) More than 2 gas sample bottles, with a pressure resistance greater than .6MPa, and the volume depends on the sampling volume; f) More than 2 oil sample bottles, with a pressure resistance greater than 6MPa, and the volume depends on the sampling volume; g) Two pressure gauges, with a range of 10MPa and an accuracy of Q.2. 5.3.2 Preparation of sampling facilities
SY/T 5154—1999
5.3.2.1 Clean the ground manifold and separator to ensure that there is no crude oil and other contaminants in the manifold and separator. 5.3.2.2 Calibrate the volume per unit height of the oil tank and select a pressure gauge, thermometer and gas flow meter with a suitable range. 5.3.3 Control and measurement of separator pressure
After determining the sampling working system, adjust the gas and oil outlet valves of the separator to stabilize the separator pressure under certain conditions (pressure greater than 3MPa, temperature greater than 30℃). The pressure fluctuation is required to be no more than 5%. 5.3.4 Determination of separator temperature
The temperature is controlled at more than 30℃, and its fluctuation does not exceed 1℃. The temperature measurement point should be selected at the gas-liquid interface of the separator. 5.3.5 Determination of gas and liquid volume in the separator
Every time the production system is changed, the well should be allowed to produce stably for 10 hours before measuring oil and gas. Measure once every 1 to 2 hours. When the difference between the gas and liquid volumes measured for 2 to 3 consecutive times is less than or equal to 5%, the next production system can be changed. 5.3.6 Determination of water production
Water production data can be obtained from the water flow meter equipped with the three-phase separator. 5.3.7 Measurement of oil volume in the oil tank
The oil volume in the oil tank can be measured with a ruler or other measuring devices. While measuring the oil volume, the oil temperature and the relative density of the oil should be measured. Then the measured oil volume in the oil tank is converted into the volume of the standard push state. If the well produces water, the volume of the produced water should be subtracted. 5.3.8 Gas sampling
5.3.8.1 Sampling point selection
The sampling point should be selected at a place where the gas phase in the separator is relatively stable, and the gas obtained should not contain misty liquid. Gas sampling can be carried out at the following locations (see Figure 2):
a) The gas outlet at the top of the separator;
b) The joint of the separator pressure gauge;
c) The sampling valve of the gas outlet pipeline;
d) The top of the measuring glass tube.
5.3.8.2 Gas sampling method
There are three gas sampling methods, and one can be selected according to specific location, climate and other conditions. a) Vacuum gas sampling method (see Figure 3 for the process).
When using this method, there should be vacuum equipment on site or the sampling bottle should be emptied in advance in the laboratory. When sampling, follow the following steps:
1) Select the separator gas sampling point, check whether the valve is flexible and easy to use, and remove the dirt on the valve. 2) Use the clean pressure-resistant hose 2 to connect the gas valve 1 and the three-way valve 3. 3) Clean and fill the hose. First open the gas valve 1, then open the three-way valve 3, and flush the hose with air. The flushing volume is about 5 times the volume of the hose. After flushing, close the three-way valve. 4) Slowly open the valve on the sampling bottle and fill the sampling bottle with air. After the pressure in the sampling bottle reaches equilibrium with the pressure of the separator, close all valves, remove the hose connecting the sampling bottle, and replace another sampling bottle for sampling. 5) The sampling bottle after sampling should be strictly checked for leakage. b) Gas sample flushing method (see Figure 3 for the process). This method can be used for single-valve sampling bottles or double-valve sampling bottles, but the temperature of the sampling bottle must be equal to or slightly higher than the gas sample temperature of the separator, otherwise it is easy to condense liquid on the inner wall of the sampling bottle after inflation, changing the composition of the gas sample. First, repeatedly flush the sampling bottle with the inflation-exhaust cycle method. Each time the gas is exhausted, the lower valve of the sampling bottle should be facing downward, so that the condensate can be found and discharged in time.
The number of inflation-exhaust cycles depends on the inflation pressure. Select the number of inflation and flushing according to Table A1 in Appendix A (Standard Appendix). When sampling, first close the lower valve of the sampling bottle. When the pressure in the sampling bottle reaches the separator pressure, close the upper valve of the sampling bottle. Check the sampling bottle for leakage after sampling.
SY/T5154—1999
1-pressure gauge; 2-measuring glass tube; 3-fluid inlet; 4-gas outlet; 5-liquid outlet
Figure 2 Schematic diagram of general oilfield separator
c) Liquid drainage and gas extraction method (process shown in Figure 3). This method requires a double-valve sampling bottle. The sampling bottle is first filled with a preset liquid (generally saturated brine), and then the preset liquid is replaced with a gas sample. When sampling, place the sampling bottle vertically, connect the gas source to flush and fill the hose. After closing the three-way valve 3, open the gas extraction valve and the upper valve of the sampling bottle, slowly open the lower valve of the sampling bottle, and release the liquid. After all the liquid is discharged from the container, close the lower valve of the sampling bottle, then close the upper valve of the sampling bottle and the gas extraction valve, and finally remove the pipeline for leak testing.
During sampling, the temperature in the sampling bottle must always be slightly higher than the separator temperature. This method is not suitable when the gas contains hydrogen sulfide and carbon dioxide. 5.3.8.3 Precautions for gas samplingwww.bzxz.net
a) The gas cannot carry oil mist. If the oil mist cannot be eliminated, an oil mist elimination device or a gas filter should be installed on the gas sampling pipeline1), and the sample should be taken at a lower flow rate.
b) When the gas contains hydrogen sulfide and carbon dioxide, it must be dehydrated with a drying tube [See Appendix C (Standard Appendix) for the production and use requirements of drying tubes.
5.3.9 Liquid sampling
5.3.9.1 Sampling point selection
The sampling point should be selected where the liquid in the separator is relatively stable without free bubbles, such as the following locations (see Figure 4): 1) The filter can be welded with a steel pipe with an inner diameter of about 70mm and a length of about 150mm, filled with cotton wool or glass wool. 6
a) The liquid end at the bottom of the separator l)
SY/T5154—1999
b) Between the separator and the flow meter, but the pipeline must have a higher pressure. c) Measuring the bottom of the glass tube. If the oil is measured with a water column, the water should be drained before sampling. 5.3.9.2 Liquid sampling method
a) Liquid drainage method (see Figure 4 for the process).
1 Gas extraction valve: 2—pressure hose; 3—three-way valve; 4—upper valve of sampling bottle: 5—sampling bottle; 6—lower valve of sampling bottle Figure 3 Separator gas sampling flow chart
1—measurement glass tube; 2—lower valve of glass tube; 3—pressure hose; 4—three-way valve; 5—sampling bottle. Seven valves; 6—sampling bottle; 7—lower valve of sampling bottle; 8—pressure gauge: 9—liquid discharge valve: 10—quality cylinder Figure 4 Separator liquid sampling (liquid discharge method) flow chart If more water and sand are produced, it is not possible to sample at this position: SY/T5154—1999
This method is similar to the liquid discharge gas extraction method. The sampling bottle is first filled with a liquid that is immiscible with oil (usually saturated brine). Use a pressure-resistant hose 3 to connect to the lower valve 2 of the glass tube and the three-way valve 4. In order to better control the back pressure, connect a pressure gauge 8 between the lower valve 7 of the sampling bottle and the drain valve 9, and place a measuring cylinder or cup 10 at the outlet to measure the volume of the preset liquid discharged. Before sampling, first fill the hose to the three-way valve 4 with separator oil, then slightly open the valve, and after three times the volume of the hose is released, close the three-way valve 4. When sampling, fully open the upper valve 5 of the sampling bottle, and then open the lower valve 7 of the sampling bottle. At this time, the pressure gauge 8 rises to the separator pressure. Then slightly open the drain valve 9 and put the preset liquid in the measuring cylinder 10 under the minimum pressure drop. After 90% of the volume of the preset liquid is released, close the drain valve 9, and then close the lower valve 7 and the upper valve 5 of the sampling bottle. After sampling, release the remaining 10% of the preset liquid to form an air cap. b) Exhaust liquid method (see Figure 5 for the process).
First fill the sampling bottle with the gas under the separator conditions, then connect the sampling bottle to the liquid sampling place, and replace all the gas with the oil sample while maintaining the separator pressure.
1-Measurement glass arm; 2-Lower valve of glass tube; 3-Pressure hose; 4-Three-way valve; 5-Lower valve of sampling bottle; 6-Sampling bottle; 7-Upper valve of sampling bottle; 8-Pressure gauge; 9-Exhaust valve Figure 5 Flow chart of liquid sampling of separator (exhaust method) The sampling steps are as follows:
1) Fill the sampling bottle with separator gas, exhaust it once, and then fill it with gas again. 2) Stand the sampling bottle upright to a convenient position, and connect a clean pressure-resistant hose 3 to the lower valve 2 of the glass tube and the three-way valve 4. 3) Open the lower valve 2 of the glass tube and the three-way valve 4, clean the filling hose, and close the three-way valve 4 after cleaning. 4) Open the lower valve 5 of the sampling bottle. Since the sampling bottle is already filled with separator gas, the pressure on both sides is balanced, and no liquid has entered the sampling bottle at this time.
5) Open the upper valve 7 of the sampling bottle with the exhaust valve 9 closed, and the pressure gauge 8 should display the separator pressure value. 6) Slightly open the exhaust valve 9 and slowly discharge all the gas in the sampling bottle. Do not allow any pressure drop during the discharge process. 7) When liquid appears in the exhaust valve 9, it is necessary to release some liquid. 8) Close all valves and remove the hose. For safety reasons, stand the sampling bottle upright and release it from the lower valve of the sampling bottle for about 1 second to form a gas cap. If there is water, it should be completely drained. 5.3.9.3 Precautions for taking liquid samples
a) If the oil production is small, a small-volume oil tank must be used to accurately measure the oil volume in the tank. b) When taking liquid samples, the temperature of the sampling bottle cannot be higher than the separator temperature, otherwise the sample will evaporate in the sample bottle, and the partial loss of gas and liquid will cause the sample to lack representativeness. If the separator temperature has dropped below 0°C, the sampling bottle can be immersed in a mixture of concentrated salt water and crushed ice.Seven valves; 6-sampling bottle; 7-sampling bottle lower valve; 8-pressure gauge: 9-drain valve: 10-quality cylinder Figure 4 Separator liquid sampling (drainage method) flow chart If there is a lot of water and sand production, it is not possible to sample at this location: SY/T5154-1999
This method is similar to the drainage and gas extraction method. The sampling bottle is first filled with a liquid that is immiscible with oil (usually saturated brine). Use a pressure-resistant hose 3 to connect to the glass tube lower valve 2 and the three-way valve 4. In order to better control the back pressure, a pressure gauge 8 is connected between the sampling bottle lower valve 7 and the drain valve 9, and a measuring tube or cup 10 is placed at the outlet to measure the volume of the preset liquid discharged. Before sampling, first fill the hose to the three-way valve 4 with separator oil, then slightly open this valve, and after the oil volume three times the volume of the hose is released, close the three-way valve 4. When sampling, fully open the upper valve 5 of the sampling bottle, and then open the lower valve 7 of the sampling bottle. At this time, the pressure gauge 8 rises to the separator pressure. Then slightly open the drain valve 9, and put the pre-set liquid in the measuring cylinder 10 under the minimum pressure drop. After releasing 90% of the volume of the pre-set liquid, close the drain valve 9, and then close the lower valve 7 of the sampling bottle and the upper valve 5 of the sampling bottle. After sampling, release the remaining 10% of the pre-set liquid to form a gas cap. b) Exhaust liquid method (see Figure 5 for the process).
First fill the sampling bottle with the gas under the separator conditions, then connect the sampling bottle to the liquid sampling place, and replace all the gas with the oil sample while maintaining the separator pressure.
1- measuring glass arm; 2- glass tube lower valve; 3- pressure hose; 4- three-way valve; 5- sampling bottle lower valve; 6- sampling bottle; 7- sampling bottle upper valve; 8- pressure gauge; 9- exhaust valve Figure 5 Separator liquid sampling (exhaust method) flow chart The sampling steps are as follows:
1) Fill the sampling bottle with separator gas, exhaust it once, and then fill it with gas again. 2) Stand the sampling bottle upright to a convenient position, connect a clean pressure-resistant hose 3 to the glass tube lower valve 2 and the three-way valve 4. 3) Open the glass tube lower valve 2 and the three-way valve 4, clean the filling hose, and close the three-way valve 4 after cleaning. 4) Open the sampling bottle lower valve 5, because the sampling bottle is already filled with separator gas, the pressure on both sides is balanced, and no liquid has entered the sampling bottle at this time.
5) Open the sampling bottle upper valve 7 with the exhaust valve 9 closed, and the pressure gauge 8 should display the separator pressure value. 6) Slightly open the exhaust valve 9 and slowly discharge all the gas in the sampling bottle. The pressure is not allowed to drop during the discharge process. 7) When liquid appears in the exhaust valve 9, some more liquid needs to be released. 8) Close all valves and remove the hose. For safety reasons, stand the sampling bottle upright and release it from the lower valve of the sampling bottle for about 1 second to form an air cap. If there is water, it should be completely drained. 5.3.9.3 Precautions for taking liquid samples
a) If the oil production is small, a small-volume oil tank must be used to accurately measure the amount of oil in the tank. b) When taking liquid samples, the temperature of the sampling bottle cannot be higher than the separator temperature, otherwise the sample will evaporate in the sample bottle, and the partial loss of gas and liquid will cause the sample to lack representativeness. If the separator temperature has dropped below 0°C, the sampling bottle can be immersed in a mixture of concentrated salt water and crushed ice.Seven valves; 6-sampling bottle; 7-sampling bottle lower valve; 8-pressure gauge: 9-drain valve: 10-quality cylinder Figure 4 Separator liquid sampling (drainage method) flow chart If there is a lot of water and sand production, it is not possible to sample at this location: SY/T5154-1999
This method is similar to the drainage and gas extraction method. The sampling bottle is first filled with a liquid that is immiscible with oil (usually saturated brine). Use a pressure-resistant hose 3 to connect to the glass tube lower valve 2 and the three-way valve 4. In order to better control the back pressure, a pressure gauge 8 is connected between the sampling bottle lower valve 7 and the drain valve 9, and a measuring tube or cup 10 is placed at the outlet to measure the volume of the preset liquid discharged. Before sampling, first fill the hose to the three-way valve 4 with separator oil, then slightly open this valve, and after the oil volume three times the volume of the hose is released, close the three-way valve 4. When sampling, fully open the upper valve 5 of the sampling bottle, and then open the lower valve 7 of the sampling bottle. At this time, the pressure gauge 8 rises to the separator pressure. Then slightly open the drain valve 9, and put the pre-set liquid in the measuring cylinder 10 under the minimum pressure drop. After releasing 90% of the volume of the pre-set liquid, close the drain valve 9, and then close the lower valve 7 of the sampling bottle and the upper valve 5 of the sampling bottle. After sampling, release the remaining 10% of the pre-set liquid to form a gas cap. b) Exhaust liquid method (see Figure 5 for the process).
First fill the sampling bottle with the gas under the separator conditions, then connect the sampling bottle to the liquid sampling place, and replace all the gas with the oil sample while maintaining the separator pressure.
1- measuring glass arm; 2- glass tube lower valve; 3- pressure hose; 4- three-way valve; 5- sampling bottle lower valve; 6- sampling bottle; 7- sampling bottle upper valve; 8- pressure gauge; 9- exhaust valve Figure 5 Separator liquid sampling (exhaust method) flow chart The sampling steps are as follows:
1) Fill the sampling bottle with separator gas, exhaust it once, and then fill it with gas again. 2) Stand the sampling bottle upright to a convenient position, connect a clean pressure-resistant hose 3 to the glass tube lower valve 2 and the three-way valve 4. 3) Open the glass tube lower valve 2 and the three-way valve 4, clean the filling hose, and close the three-way valve 4 after cleaning. 4) Open the sampling bottle lower valve 5, because the sampling bottle is already filled with separator gas, the pressure on both sides is balanced, and no liquid has entered the sampling bottle at this time.
5) Open the sampling bottle upper valve 7 with the exhaust valve 9 closed, and the pressure gauge 8 should display the separator pressure value. 6) Slightly open the exhaust valve 9 and slowly discharge all the gas in the sampling bottle. The pressure is not allowed to drop during the discharge process. 7) When liquid appears in the exhaust valve 9, some more liquid needs to be released. 8) Close all valves and remove the hose. For safety reasons, stand the sampling bottle upright and release it from the lower valve of the sampling bottle for about 1 second to form an air cap. If there is water, it should be completely drained. 5.3.9.3 Precautions for taking liquid samples
a) If the oil production is small, a small-volume oil tank must be used to accurately measure the amount of oil in the tank. b) When taking liquid samples, the temperature of the sampling bottle cannot be higher than the separator temperature, otherwise the sample will evaporate in the sample bottle, and the partial loss of gas and liquid will cause the sample to lack representativeness. If the separator temperature has dropped below 0°C, the sampling bottle can be immersed in a mixture of concentrated salt water and crushed ice.
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