CN116591647A - Novel CO 2 Displacement and throughput system and method - Google Patents
Novel CO 2 Displacement and throughput system and method Download PDFInfo
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- CN116591647A CN116591647A CN202310519998.5A CN202310519998A CN116591647A CN 116591647 A CN116591647 A CN 116591647A CN 202310519998 A CN202310519998 A CN 202310519998A CN 116591647 A CN116591647 A CN 116591647A
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- 238000006073 displacement reaction Methods 0.000 title claims abstract description 110
- 238000000034 method Methods 0.000 title claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 77
- 238000002347 injection Methods 0.000 claims abstract description 53
- 239000007924 injection Substances 0.000 claims abstract description 53
- 230000000694 effects Effects 0.000 claims abstract description 38
- 239000007788 liquid Substances 0.000 claims description 102
- 238000003756 stirring Methods 0.000 claims description 55
- 238000002474 experimental method Methods 0.000 claims description 34
- 239000003921 oil Substances 0.000 claims description 28
- 238000004088 simulation Methods 0.000 claims description 27
- 238000003860 storage Methods 0.000 claims description 25
- 239000012530 fluid Substances 0.000 claims description 19
- 230000001105 regulatory effect Effects 0.000 claims description 19
- 239000011435 rock Substances 0.000 claims description 18
- 239000000126 substance Substances 0.000 claims description 17
- 239000000243 solution Substances 0.000 claims description 16
- 239000010779 crude oil Substances 0.000 claims description 15
- 239000011521 glass Substances 0.000 claims description 11
- 229920006395 saturated elastomer Polymers 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 abstract description 132
- 238000011161 development Methods 0.000 abstract description 16
- 238000011160 research Methods 0.000 abstract description 10
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- 230000007246 mechanism Effects 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 description 1
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
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- 239000001099 ammonium carbonate Substances 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/164—Injecting CO2 or carbonated water
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/70—Combining sequestration of CO2 and exploitation of hydrocarbons by injecting CO2 or carbonated water in oil wells
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- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Geophysics (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a novel CO 2 Displacement and throughput systems and methods. The system of the invention can be used for carrying out hydrocarbon reservoir carbonized water displacement, gas injection exploitation, water-gas alternate injection displacement and CO 2 Throughput, etc. The displacement or huff and puff development effect of various gases and the like on the underground oil and gas reservoir under the stratum temperature and pressure conditions is researched, and the effects of displacement or huff and puff development of the gases, steam or carbonized water and the like under different conditions are obtained through analysis, and the influence rules of sensitivity factors such as displacement amount, displacement, temperature and pressure and the like on the displacement development effect and the huff and puff development effect are obtained. The invention has the advantages of high operation control speed, high efficiency, small error and convenient cleaning of the system pipeline; the modularized design is adopted, and the method can be widely applied to various research fields according to different experimental targets, and influences the displacement effect or throughputThe sensitivity factor of the development effect is researched, so that the development effect of the oil and gas reservoir is guided to be improved.
Description
Technical Field
The invention relates to the technical field of CCUS and oil gas exploitation, in particular to a novel CO 2 Displacement and throughput systems and methods.
Background
The same type of displacement and throughput system can be used for carrying out evaluation research on gas injection or water injection exploitation of the oil and gas reservoir; and researching the displacement development effect of gas or water on the stratum containing crude oil under stratum conditions, and analyzing the influence factors of the displacement development effect of different amounts of gas or water. The existing system of the same type has simple function and can not simulate and research the influence of carbonized water on the displacement effect; inaccurate control of temperature and pressure brings larger error to research; the influences of factors such as the length and the short size of the rock sample on the displacement effect and the throughput development effect are not considered.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent.
To this end, embodiments of the present invention propose a novel CO 2 Displacement and throughput systems and methods.
In one aspect, the present invention provides a novel CO 2 A displacement and throughput system comprising:
the gas injection system comprises a gas cylinder, a gas booster pump is arranged on an outlet pipeline of the gas cylinder, a storage tank is arranged on an outlet pipeline of the gas booster pump, and a pressure regulating valve is arranged on an outlet pipeline of the storage tank;
the liquid injection system is arranged at the downstream of the gas injection system and comprises a piston stirring container and a plurality of piston containers, wherein the piston stirring container is arranged in parallel with the piston containers, the lower parts of the piston stirring container and the piston containers are connected with a power pump, and a stirring device is arranged in the piston stirring container;
The model system is arranged at the downstream of the liquid injection system and comprises a ring-pressure pump and at least one core holder, wherein the ring-pressure pump is used for adjusting the ring pressure of the core holder, and the outlet end and the inlet end of the core holder are communicated through a communicating pipe;
the pressure control system comprises a back pressure valve and a manual pump, the back pressure valve is arranged at the outlet end and the inlet end of the core holder, and the manual pump is used for adjusting the pressure of the back pressure valve;
the gas-liquid metering system is arranged at the downstream of the model system and comprises a gas-liquid separator, a first flowmeter arranged at the outlet end of the upper part of the gas-liquid separator and a liquid metering device arranged at the outlet end of the lower part of the gas-liquid separator;
the temperature control system comprises a first temperature control box, a second temperature control box and a third temperature control box, wherein the first temperature control box is arranged at the periphery of the gas injection system and the liquid injection system, the second temperature control box is arranged at the periphery of the core holder, and the third temperature control box is arranged at the periphery of the gas-liquid separation system;
and the vacuumizing device is arranged on a branch of the outlet pipeline of the piston stirring container.
In some embodiments, the piston receptacles include a first piston receptacle, a second piston receptacle, and a third piston receptacle disposed in parallel, the first piston receptacle, the second piston receptacle, and the third piston receptacle being for housing gas, crude oil, and a chemical solution, respectively.
In some embodiments, a differential pressure sensor is disposed on the line between the outlet end and the inlet end of the core holder.
In some embodiments, the backpressure valve comprises a first backpressure valve disposed at the core holder inlet end and a second backpressure valve disposed at the core holder outlet end.
In some embodiments, the output end of the manual pump is connected with a first buffer tank, a first valve is arranged on a pipeline between the outlet end of the first buffer tank and the first back pressure valve, and a second valve is arranged on a pipeline between the outlet end of the first buffer tank and the second back pressure valve.
In some embodiments, a first relief valve is provided in the branch of the tank inlet line, a second relief valve is provided in the branch of the upper line of the piston stirring vessel, and a third relief valve is provided in the branch of the first buffer tank outlet line.
In some embodiments, the inlet end of the storage tank, the upper pipeline of the piston container, the outlet end and the inlet end of the core holder, the outlet end of the first buffer tank and the inlet end of the gas-liquid separator are provided with pressure gauges and temperature gauges.
In some embodiments, a dryer is disposed between the gas-liquid separator and the first flow meter, and a first check valve is disposed between the dryer and the first flow meter.
In some embodiments, the liquid metering device comprises a balance and a glass container placed on the balance.
In another aspect, the present invention provides a novel CO 2 The displacement and throughput method comprises a displacement simulation experiment and a throughput simulation experiment,
wherein CO 2 The displacement simulation experiment of the formed carbonized water comprises the following steps:
(1) Checking the air tightness of the system, loading a rock sample of saturated oil into a core holder, and vacuumizing the system;
(2) The pressure value of the back pressure valve is regulated by a manual pump, the ring pressure value is regulated by a ring pressure pump, and the temperatures of the first temperature control box, the second temperature control box and the third temperature control box are set as target values;
(3) CO in a gas cylinder 2 After being pressurized by a gas booster pump, the gas is stored in a storage tank;
(4) CO in the storage tank 2 Injecting into the first piston container to make CO in the first piston container 2 Pumping the chemical solution in the third piston container into a piston stirring container according to a certain proportion, stirring and mixing uniformly to form carbonized water, and recording the concentration of the carbonized water;
(5) Injecting carbonized water into the core holder by using a power pump to perform a displacement simulation experiment, and recording the injection quantity of the carbonized water;
(6) Measuring the gas and liquid amount at the outlet end of the core holder by using a gas and liquid metering system, and analyzing the displacement effect of carbonized water;
CO 2 the throughput simulation experiment comprises the following steps:
(1) Checking the air tightness of the system, loading a rock sample of saturated oil into a core holder, and vacuumizing the system;
(2) The pressure value of the back pressure valve is regulated by a manual pump, the ring pressure value is regulated by a ring pressure pump, and the temperatures of the first temperature control box, the second temperature control box and the third temperature control box are set as target values;
(3) CO in a gas cylinder 2 After being pressurized by a gas booster pump, the gas is stored in a storage tank;
(4) CO in the storage tank 2 Injecting into the first piston container, and using the power pump to pump CO in the first piston container 2 Injecting through one end of the core holder;
(5) Closing valves at two ends of the core holder, simulating well closing for a certain time, opening the valve at one end of the core holder for injecting the handling object, and discharging fluid from the same end of the core holder, wherein the fluid flows to a gas-liquid metering system;
(6) The gas-liquid metering system is used for metering the gas-liquid amount of the fluid, the throughput effect is analyzed, and the throughput operation is completed at this time;
(7) Repeating the steps (4) - (6) for a plurality of times until the throughput injected from one end of the core holder is equal to the throughput flowing out from the same end of the core holder and the discharged oil amount is zero in more than three continuous throughput operations, and completing the throughput experiment.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the piston stirring container is arranged to form carbonized water with a certain proportion, and the stirring device is arranged at the lower part of the piston stirring container to fully mix liquid and gas; the temperature control box and the back pressure valve can accurately control the temperature and the pressure, and can simulate a high-temperature high-pressure displacement experiment under the formation temperature and pressure conditions, so that the measurement of an experiment result is accurate, and the experiment error is reduced; the arrangement of the gas booster pump and the storage tank can study the displacement and throughput effects of various gases.
The system of the invention can be used for carrying out oil and gas reservoir carbonized water displacement experiments, gas injection exploitation experiments, water-gas exchange experiments and CO 2 Throughput experiments and the like. Under the condition of stratum temperature and pressure, the displacement development effect or throughput development effect of various gases and the like on the stratum containing crude oil is researched through indoor simulation experiments, and the displacement or throughput development effect of different gases, vapors or carbonized water is analyzed and obtained, and the influence rule of influence sensitivity factors such as displacement amount, displacement, temperature and pressure on the displacement development effect and throughput development effect is obtained.
The invention has the advantages of high operation control speed, high efficiency, small error and convenient cleaning of the system pipeline; the modularized design is adopted, so that the method can be widely applied to various experimental research fields according to different experimental requirements, and can be used for researching sensibility factors influencing displacement effects or throughput development effects, thereby guiding the improvement of oil displacement effects.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a novel CO of an embodiment of the present invention 2 A schematic diagram of a displacement and throughput system;
reference numerals illustrate:
the gas cylinder 1, the gas booster pump 2, the mute air compressor 3, the storage tank 4, the first safety valve 5, the first pressure gauge 6, the first thermometer 7, the pressure regulating valve 8, the second check valve 9, the first piston container 10, the second piston container 11, the third piston container 12, the piston stirring container 13, the fourth valve 14, the power pump 15, the water tank 16, the second pressure gauge 17, the second thermometer 18, the second safety valve 19, the vacuumizing device 20, the first back pressure valve 21, the second back pressure valve 22, the manual pump 23, the first buffer tank 24, the third safety valve 25, the first valve 26, the second valve 27, the fifth pressure gauge 28, the fifth thermometer 29, the long core holder 30, the short core holder 31, the first differential pressure sensor 32, the second differential pressure sensor 33, the communicating pipe 34, the third valve 35, the fifth valve 36, the sixth valve 37, the seventh valve 38, the eighth valve 39, the loop pump 40, the second buffer tank 41, the third pressure gauge 42, the third thermometer 43, the fourth pressure gauge 44, the fourth thermometer 44, the fourth temperature gauge 45, the fourth pressure gauge 46, the third temperature control box 52, the third temperature gauge 52, the third temperature control box 54, the third temperature gauge 46, the third temperature control valve 54, the third temperature gauge case 54, the third temperature control valve and the third pressure gauge case.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
The novel CO proposed according to the embodiment of the present invention is described below with reference to the accompanying drawings 2 Displacement and throughput systems and methods.
As shown in FIG. 1, the novel CO of the present invention 2 Displacement and throughput systems, including gas injection systems, liquid injection systems, modeling systems, pressure control systems, gas-liquid metering systems, temperature control systems, and vacuum 20.
The gas injection system comprises a gas cylinder 1, a gas booster pump 2 is arranged on an outlet pipeline of the gas cylinder 1, a storage tank 4 is arranged on an outlet pipeline of the gas booster pump 2, and a pressure regulating valve 8 is arranged on an outlet pipeline of the storage tank 4.
Specifically, the gas cylinders 1 are used for placing the gas for performing the displacement and throughput simulation experiments, one or more gas cylinders 1 can be arranged, and a plurality of gas cylinders 1 can be alternately used for guaranteeing gas supply or placing different kinds of gas. The gas booster pump 2 is arranged on an outlet pipeline of the gas cylinder 1, the storage tank 4 is arranged on an outlet pipeline of the gas booster pump 2, and the gas in the gas cylinder 1 is stored in the storage tank 4 after being boosted by the gas booster pump 2. The gas pressurized by the gas booster pump 2 is high-pressure gas, and a pressure regulating valve 8 is arranged on an outlet pipeline of the storage tank 4 in order to obtain gas with proper pressure in the experimental process.
The gas booster pump 2 is mainly used for boosting gas, the mute air compressor 3 arranged at the input end of the gas booster pump 2 provides compressed air for the gas booster pump 2, the gas booster pump 2 uses the compressed air as a power source, the gas booster pump 2 is used as a pressure source, and the output gas pressure is proportional to the driving gas source pressure. By adjusting the pressure of the driving gas source, the corresponding pressurized gas pressure can be obtained. When the pressure of the driving air source is balanced with the pressure of the pressurized air, the air booster pump 2 stops pressurizing, and the output air pressure is stabilized at the preset pressure, so that the air booster pump has the characteristics of explosion prevention, adjustable output pressure, small volume, light weight, simple operation, reliable performance, wide application range and the like.
In some embodiments, a first pressure gauge 6 and a first temperature gauge 7 are provided at the inlet end of the tank 4, the first pressure gauge 6 and the first temperature gauge 7 being used to test the pressure and temperature of the gas in the tank 4. A first safety valve 5 is arranged in the branch of the inlet line of the tank 4, which automatically releases pressure when the tank 4 is over-pressurized.
The liquid injection system is arranged at the downstream of the gas injection system, the liquid injection system comprises a piston stirring container 13 and a plurality of piston containers, the piston stirring container 13 is connected with the piston containers in parallel, the lower parts of the piston stirring container 13 and the piston containers are both connected with a power pump 15, and a stirring device is arranged in the piston stirring container 13.
Specifically, the liquid injection system is located at the downstream of the gas injection system, and the liquid injection system comprises a piston stirring container 13 and a plurality of piston containers, wherein the piston containers are used for placing substances required in the experimental process, the piston stirring container 13 is a piston stirring container with a stirring function, a stirring device is arranged at the bottom of the piston stirring container 13, and the piston stirring container 13 is used for forming carbonized water. The piston container and the piston stirring container 13 are arranged in parallel, the lower parts of the piston container and the piston stirring container 13 are connected with the power pump 15, and the power pump 15 provides injection power. When it is desired to inject carbonized water into the core holder, the carbonized water is pumped out of the upper outlet end of the piston agitation vessel 13 by the power pump 15. In addition, the piston container is designed with an upper-lower trigger mechanism, when the piston moves to the two-limit position, the computer detects that the piston moves to the two-limit end position, and automatic fluid supplementing of fluid in the piston container is realized. The injection displacement of the power pump 15 may be adjustable, either as a constant displacement injection or a variable displacement injection, including but not limited to an injection with progressively increasing displacement or an injection with progressively decreasing displacement, as desired by the experiment.
In some embodiments, the piston reservoirs include a first piston reservoir 10, a second piston reservoir 11, and a third piston reservoir 12 disposed in parallel, the first piston reservoir 10, the second piston reservoir 11, and the third piston reservoir 12 being configured to hold gas, crude oil, and a chemical solution, respectively.
Specifically, the upper part of the first piston container 10 is connected with the outlet end of the pressure regulating valve 8, the gas in the storage tank 4 enters the first piston container 10 after being regulated by the pressure regulating valve 8, a second pressure gauge 17 and a second temperature gauge 18 are arranged on the upper pipeline of the first piston container 10, and the second temperature gauge 18 and the second pressure gauge 17 are used for testing the pressure and the temperature of the gas flowing out of the first piston container 10. It will be appreciated that CO is increased due to the temperature and pressure rise 2 A change of phase occurs, e.g. supercritical CO formation 2 If the gas mass flow controller is continuously used, inaccuracy of data is definitely caused because of CO 2 Has not been CO 2 Gas is not suitable for metering with a gas mass flow controller.
CO is processed by 2 First, the first piston container 10 is filled with CO 2 Whether gas or liquid can pass through the power pump 15Injection quantity is combined with the second thermometer 18 and the second pressure meter 17 for CO 2 Is converted into the flow rate of (c). Crude oil is placed in the second piston container 11, and the crude oil is used for displacing a saturated rock sample in experimental simulation, and the crude oil is pumped into the core holder by the power pump 15, and similarly, the amount of injected crude oil is measured according to the injection amount of the power pump 15. When the displacement of the rock sample injected crude oil of the power pump 15 is the same as and stable to the displacement of the crude oil flowing out of the second back pressure valve 22, the rock sample is considered to be saturated crude oil, wherein the amount of crude oil flowing out of the second back pressure valve 22 is metered by the glass vessel 50 and the balance 51. A third piston container 12 is provided for holding a chemical solution. Wherein the chemical solution is salt or surfactant or mixture of the two, wherein the salt can be sodium chloride solution, ammonium carbonate solution, etc., and the surfactant can be polyacrylamide substance or other surfactant. Research on CO by the solution 2 An influence law of carbonized water is formed in water, and a displacement or huff and puff exploitation effect is achieved. CO 2 The formation of carbonized water displaces the rock sample saturated with crude oil under certain stratum conditions, and the stratum water is water containing salts. In addition, the surfactant is a surfactant that affects CO 2 The solubility in water and the important factors of the displacement development effect are that the influence of the surfactants with different types and amounts on the formation and the displacement effect of the carbonized water can be examined by adding the surfactants with different types and amounts in the simulated stratum water sample, so that a foundation is provided for better utilization of the carbonized water for displacement.
In operation, the chemical solution of the third piston container 12 is first injected into the piston stirring container 13 from the upper portion of the piston stirring container 13 via the upper line by means of the power pump 15, and then the CO in the first piston container 10 is injected into the piston stirring container 13 2 The gas is quantitatively injected from the upper part of the piston stirring container 13 through an upper pipeline, is stirred and mixed uniformly in the piston stirring container 13 to form carbonized water, and finally, the carbonized water is used for carrying out subsequent displacement experiments. It will be appreciated that the CO will be 2 And the chemical solution is pumped into the piston stirring container 13 according to a certain proportion, so that carbonized water with a certain concentration can be obtained.
In some embodiments, the power pump 15 is a constant-speed constant-pressure pump, the input end of the power pump 15 is connected with the water tank 16, and clean water is placed in the water tank 16, and no chemical reagent is contained in the clean water. Clear water can be used for cleaning system equipment and inspecting CO 2 Displacement effect of carbonized water formed by dissolution in clear water. When CO is to be treated 2 When the water is dissolved in the clean water to form carbonized water, the clean water in the water tank 16 is pumped into the piston stirring container 13 from the upper pipeline of the piston stirring container 13 by the power pump 15 through the fourth valve 14, namely the piston stirring container 13 is filled with clean water, and then the CO in the first piston container 10 is pumped into the container 2 The gas is quantitatively injected from the upper part of the piston stirring container 13 through an upper pipeline, and is stirred and mixed uniformly in the piston stirring container 13 to form carbonized water, and redundant CO 2 Finally flows to the first flowmeter 47 through the communicating pipe 34, and CO injected by the first piston container 10 is injected 2 Subtracting the amount of CO flowing from the first flow meter 47 2 The amount of (2) is the CO dissolved in the saturated carbonized water 2 Finally, the subsequent displacement experiment is carried out by using carbonized water. Wherein a fourth valve 14 is arranged in parallel with the piston stirring vessel 13. In addition, under the condition of a certain temperature and pressure, CO 2 And clean water are pumped into the piston stirring container 13 according to a certain proportion to prepare carbonized water solution with a certain concentration.
In some embodiments, a second one-way valve 9 is provided in the line between the pressure regulating valve 8 and the upper part of the first piston container 10, the provision of the second one-way valve 9 avoiding metering errors caused by the back flow of gas.
In some embodiments, a second safety valve 19 is provided in the branch of the upper line of the piston stirring vessel 13. Specifically, a second safety valve 19 is disposed on a branch of the upper pipeline of the piston stirring vessel 13, and the second safety valve 19 is mainly used for preventing gas overpressure, and when gas flowing out of the first piston vessel 10 enters the piston stirring vessel 13 through the upper pipeline of the piston stirring vessel 13, the gas is automatically depressurized if the gas overpressure occurs.
The model system is arranged at the downstream of the liquid injection system, and comprises a ring pressure pump 40 and at least one core holder, wherein the ring pressure pump 40 is used for adjusting the ring pressure of the core holder, the outlet end and the inlet end of the core holder are communicated through a communicating pipe 34, and a third valve 35 is arranged on the communicating pipe 34.
Specifically, the model system is used for performing displacement experiments and throughput experiments, and is arranged at the downstream of the liquid injection system, and comprises at least one core holder and a ring pressure pump 40, wherein the ring pressure pump 40 is used for adjusting the ring pressure of the core holder, the output end of the ring pressure pump 40 is connected with a second buffer tank 41, the output end of the second buffer tank 41 is connected with the core holder through a pipeline, and it can be understood that when a plurality of core holders are provided, the output end of the second buffer tank 41 is respectively connected with the plurality of core holders through a plurality of pipelines. The outlet end and the inlet end of the core holder are communicated by the communicating pipe 34, and when the throughput experiment is carried out, fluid flows out of or into the core holder through the communicating pipe 34. And a differential pressure sensor is arranged on a pipeline between the inlet end and the outlet end of the core holder so as to test the differential pressure of the two ends of the core holder.
In some embodiments, a pressure gauge and a temperature gauge are provided at both the outlet and inlet ends of the core holder. Specifically, a third pressure gauge 42 and a third temperature gauge 43 are disposed at the inlet end of the core holder, the third pressure gauge 42 and the third temperature gauge 43 are used for testing the pressure and the temperature of the fluid entering the core holder, a fourth pressure gauge 44 and a fourth temperature gauge 45 are disposed at the outlet end of the core holder, and the fourth pressure gauge 44 and the fourth temperature gauge 45 are used for testing the pressure and the temperature of the fluid flowing out of the core holder.
The annular pressure pump 40 is used for annular pressure loading and can automatically track annular pressure so that the rock sample is subjected to stress similar to the condition of underground oil reservoir temperature and pressure. The pump speed, pressure protection, tracking injection pressure, and maintaining differential pressure can be operated by a computer.
The type and the size of the core holder are selected and designed according to the requirements, the core holder is designed with an installation supporting mechanism, a left sealing head, a measuring point, a rubber cylinder, a right core plug, a right sealing head, a supporting rod, a supporting ring, a leading-out rod and a leading-out sealing mechanism, and the core holder is directly placed into the cylinder body after the cylinder body is installed outside the cylinder body, so that the installation is convenient and quick. The sealing heads and other materials which are frequently detached can be made of titanium alloy materials, so that the weight is light, and the installation is convenient. The loading and unloading anchor clamps between rock core and rubber section of thick bamboo slope certain angle, the rock core of being convenient for utilizes gravity to slide down. Roughening the inner wall of the core holder model cylinder body to prevent streaming; the inner cavity is designed with a heat insulation device, the plug is designed with a piston compacting structure, and each pressure measuring point and the plug are designed with a sand prevention structure.
The model system is specifically described below by taking two core holders as an example, and comprises a long core holder 30 and a short core holder 31 which are arranged in parallel, and core holders with different sizes are arranged to examine the influence of different rock sample sizes on displacement and throughput effects. The communicating tube 34 is also provided in parallel with the long core holder 30 and the short core holder 31, and a third valve 35 is provided on the communicating tube 34. A first differential pressure sensor 32 is arranged on a pipeline between the outlet end and the inlet end of the long core holder 30, a second differential pressure sensor 33 is arranged on a pipeline between the outlet end and the inlet end of the short core holder 31, a fifth valve 36 is arranged at the inlet end of the long core holder 30, a sixth valve 37 is arranged at the outlet end of the long core holder 30, a seventh valve 38 is arranged at the inlet end of the short core holder 31, and an eighth valve 39 is arranged at the outlet end of the short core holder 31. The output end of the annular pressure pump 40 is connected with a second buffer tank 41, and the output end of the second buffer tank 41 is respectively connected with the long core holder 30 and the short core holder 31 through two pipelines, so that the annular pressure of the long core holder 30 and the short core holder 31 is controlled by the annular pressure pump 40.
When the displacement experiment is carried out, the fifth valve 36 and the sixth valve 37 are opened, the seventh valve 38, the eighth valve 39 and the third valve 35 are closed, the carbonized water enters the long core holder 30 from the fifth valve 36 for displacement, and the gas-liquid mixture flows out through the sixth valve 37; when the displacement experiment of the carbonized water is performed by using the short core holder 31, the seventh valve 38 and the eighth valve 39 are opened, the fifth valve 36, the sixth valve 37 and the third valve 35 are closed, the carbonized water enters the short core holder 31 from the seventh valve 38 for displacement, and the gas-liquid mixture flows out through the eighth valve 39. The long core holder 30 and the short core holder 31 may perform the displacement experiment separately in the above manner, or may perform the displacement experiment work simultaneously. When the long core holder 30 and the short core holder 31 perform the displacement experiment at the same time, the ring pressures of the long core holder 30 and the short core holder 31 may be the same or different.
In addition, in the process of carrying out the displacement experiment, when displacement that the displacement thing was injected from the rock core holder entry end equals and stable with the discharge capacity that flows from the rock core holder exit end, and the oil-free quilt is displaced, the displacement experiment is accomplished, the volume of the displacement material of record injection and the oil gas water etc. of displacement and displacement, analysis displacement effect. Wherein the displacement may be CO 2 Water, carbonized water, or chemical solutions, and the like.
In the throughput experiment, the long core holder 30 and the short core holder 31 were operated separately, and CO was performed while using the long core holder 30 2 During throughput experiments of (a), there are two paths, one is to open the fifth valve 36 first and close the sixth valve 37 and the third valve 35, CO 2 Injecting the fluid into the core holder through the fifth valve 36, closing the fifth valve 36, opening the third valve 35 and the fifth valve 36 after simulating well closing for a certain time, enabling the fluid flowing out of the long core holder 30 to flow out through the fifth valve 36, and then flowing to a downstream gas-liquid metering system through the communicating pipe 34 through the third valve 35 and the second back pressure valve 22; another way is to first open the sixth valve 37 and the third valve 35, close the fifth valve 36, CO 2 The long core holder 30 is sequentially injected through the communicating pipe 34 through the third valve 35 and the sixth valve 37, then the sixth valve 37 and the third valve 35 are closed, after a certain period of well closing is simulated, the sixth valve 37 is opened, the fluid flowing out of the long core holder 30 flows out through the sixth valve 37, and then flows to a downstream gas-liquid metering system through the second back pressure valve 22. While CO is taking place with a short core holder 31 2 There are two paths in the same way, and CO is performed with the long core holder 30 2 The principle is the same in the throughput experiment, and will not be described in detail here.
In addition, multiple throughput operations are required during the entire throughput experiment. In more than 3 consecutive throughput operations, the throughput injected from one end of the core holder and the throughput flowing from the same end of the core holderWhen the amounts of the substances are equal and the amount of the discharged oil is zero, the throughput experiment is completed, the amounts of the injected substances such as the throughput and the discharged oil, gas and water are recorded, and the throughput effect is analyzed. Wherein the throughput may be CO 2 、N 2 Etc.
The pressure control system comprises a back pressure valve and a manual pump 23, the back pressure valve is arranged at the outlet end and the inlet end of the core holder, and the manual pump 23 is used for adjusting the pressure of the back pressure valve. The back pressure valve comprises a first back pressure valve 21 and a second back pressure valve 22, wherein the first back pressure valve 21 is arranged at the inlet end of the core holder, and the second back pressure valve 22 is arranged at the outlet end of the core holder. The output end of the manual pump 23 is connected with a first buffer tank 24, a first valve 26 is arranged on a pipeline between the outlet end of the first buffer tank 24 and the first back pressure valve 21, and a second valve 27 is arranged on a pipeline between the outlet end of the first buffer tank 24 and the second back pressure valve 22.
Specifically, the pressure control system is used for controlling the pressure of the model entering and exiting system, namely controlling the pressure of the core entering and exiting holder, and mainly comprises a manual pump 23 and a back pressure valve, and the pressure value of the back pressure valve is regulated by the manual pump 23, so that the pressure of the core entering and exiting holder is controlled. The back pressure valve comprises a first back pressure valve 21 and a second back pressure valve 22, wherein the first back pressure valve 21 is arranged at the inlet end of the core holder and used for controlling the pressure entering the core holder, and the second back pressure valve 22 is arranged at the outlet end of the core holder and used for controlling the pressure flowing out of the core holder. The output end of the manual pump 23 is connected with the first buffer tank 24, the output end of the first buffer tank 24 is respectively connected with the first back pressure valve 21 and the second back pressure valve 22 through pipelines, the first valve 26 is arranged on the pipeline between the output end of the first buffer tank 24 and the first back pressure valve 21, and the second valve 27 is arranged on the pipeline between the output end of the first buffer tank 24 and the second back pressure valve 22. When the pressure of the first back pressure valve 21 needs to be regulated, the first valve 26 is opened, the second valve 27 is closed, and the pressure of the first back pressure valve 21 is increased or decreased by the manual pump 23; when it is necessary to adjust the pressure of the second back pressure valve 22, the second valve 27 is opened, the first valve 26 is closed, and the pressure of the second back pressure valve 22 is increased or decreased by the manual pump 23.
The back pressure valve adopts a piston type structure and mainly comprises a valve body and a valve core, and has the advantages of high adjustment sensitivity, high pressure resistance, high control precision, light weight and the like. The valve body is provided with a back pressure interface and a liquid inflow and outflow interface respectively from top to bottom, the valve core adopts a piston structure, a plunger protruding head axially extends at the bottom of the piston, a cylindrical hole matched with the plunger protruding head is prefabricated at the lower part of the valve body, the liquid inflow interface and the outflow interface are respectively connected to the bottom of the cylindrical hole of the valve body below the plunger protruding head through a flow guide cavity, one side of the valve body is also provided with an auxiliary liquid inflow interface which is connected with a liquid inflow pipe together, and the auxiliary liquid inflow interface is connected to the joint part of the lower part of the valve body and the piston body through the flow guide cavity.
In some embodiments, a fifth pressure gauge 28 and a fifth temperature gauge 29 are provided at the outlet end of the first buffer tank 24, the fifth pressure gauge 28 and the fifth temperature gauge 29 being used to test the pressure and temperature at the outlet end of the first buffer tank 24.
In some embodiments, a third relief valve 25 is provided in the branch of the outlet line of the first buffer tank 24, which automatically relieves pressure when the first buffer tank 24 is over-pressurized.
The gas-liquid metering system is disposed downstream of the model system, and includes a gas-liquid separator 46, a first flowmeter 47 disposed at an upper outlet end of the gas-liquid separator 46, and a liquid metering device disposed at a lower outlet end of the gas-liquid separator 46. A dryer 48 is provided between the gas-liquid separator 46 and the first flowmeter 47, and a first check valve 49 is provided between the dryer 48 and the first flowmeter 47. The liquid metering device includes a balance 51 and a glass container 50 placed on the balance 51.
Specifically, the gas-liquid metering system is arranged at the downstream of the model system and is used for testing the gas-liquid amount flowing out from the model system. The gas-liquid metering system comprises a gas-liquid separator 46, a first flowmeter 47 and a liquid metering device, wherein the first flowmeter 47 is arranged on an upper outlet pipeline of the gas-liquid separator 46, a dryer 48 is arranged on a pipeline between the gas-liquid separator 46 and the first flowmeter 47, the dryer 48 is used for drying gas separated by the gas-liquid separator 46, a first one-way valve 49 is arranged on a pipeline between the dryer 48 and the first flowmeter 47, gas metering errors caused by gas backflow are avoided due to the arrangement of the first one-way valve 49, and gas metering errors caused by vapor carried by gas are avoided due to the arrangement of the dryer 48. A liquid metering device is provided at the lower outlet end of the gas-liquid separator 46, the liquid metering device including a balance 51 and a glass container 50, wherein the glass container 50 is placed on the balance 51, and the mass of the liquid in the glass container 50 is metered by the balance 51. The glass container 50 may be a container with a metering scale through which the volume of liquid is read by the scale of the glass container 50. In addition, when the liquid is a water-oil mixture, the volumes of water and oil can be read separately by the metering scale of the glass container 50 due to the stratification of the water and oil.
In some embodiments, a sixth pressure gauge 52 and a sixth temperature gauge 53 are provided at the upper inlet end of the gas-liquid separator 46, the sixth pressure gauge 52 and the sixth temperature gauge 53 being provided on the inlet line of the gas-liquid separator 46 for testing the pressure and temperature of the fluid entering the gas-liquid separator 46.
The temperature control system comprises a first temperature control box 54, a second temperature control box 55 and a third temperature control box 56, wherein the first temperature control box 54 is arranged on the periphery of the gas injection system and the liquid injection system, the second temperature control box 55 is arranged on the periphery of the core holder, and the third temperature control box 56 is arranged on the periphery of the gas-liquid metering system. Wherein, the first temperature control box 54 is used for simulating the formation temperature of carbonized water, the second temperature control box 55 is used for simulating certain formation temperature conditions, and the third temperature control box 56 is used for simulating the surface temperature.
In some embodiments, the gas cylinder 1 and the power pump 15 are disposed outside the first temperature control box 54. In some embodiments, the balance 51 and the glass container 50 are disposed outside the third temperature control box 55.
The vacuumizing device 20 is used for vacuumizing the experimental system, and the vacuumizing device 20 is arranged on a branch of an outlet pipeline of the piston stirring container 13. In some embodiments, the evacuation device 20 is a vacuum pump.
Novel CO 2 Displacement and throughput method, novel CO utilizing the present invention 2 The displacement and throughput system comprises a displacement simulation experiment and a throughput simulation experiment.
The following specifically describes a specific process of a displacement simulation experiment by taking carbonized water displacement as an example, and the method comprises the following steps:
(1) Checking the air tightness of the system, loading a rock sample of saturated oil into a core holder, and vacuumizing the system;
(2) The pressure values of the first back pressure valve 21 and the second back pressure valve 22 are adjusted to target values by the manual pump 23, the ring pressure value is adjusted to the target values by the ring pressure pump 40, and the temperatures of the first temperature control box 54, the second temperature control box 55, and the third temperature control box 56 are set to the target values;
(3) CO in gas cylinder 1 2 The gas is stored in a storage tank 4 after being pressurized by a gas booster pump 2;
(4) CO in the tank 4 2 Injecting into the first piston container 10 to CO in the first piston container 10 2 Pumping the chemical solution in the third piston container 12 into a piston stirring container 13 according to a certain proportion, stirring and mixing uniformly to form carbonized water, and recording the concentration of the carbonized water;
(5) Injecting carbonized water into the core holder by using a power pump 15 to perform a displacement simulation experiment, and recording the injection amount of the carbonized water;
(6) The gas-liquid metering system is used for metering the gas and liquid amount at the outlet end of the core holder, the gas-liquid mixture flowing out of the outlet end of the core holder is separated into gas and liquid through the gas-liquid separator 46, the gas is metered through the first flowmeter 47, the liquid is metered through the liquid metering device, and the displacement effect is analyzed.
It will be appreciated that in step (4) if the ratio of chemical solutions is 0, then it is CO 2 Simulation experiments to displace crude oil. In addition, in performing a displacement experiment, either the long core holder 30 or the short core holder 31 may be selected.
The following is CO 2 The throughput simulation experiment is a specific process for illustrating the throughput simulation experiment, and comprises the following steps:
(1) Checking the air tightness of the system, loading a rock sample of saturated oil into a core holder, and vacuumizing the system;
(2) The pressure values of the first back pressure valve 21 and the second back pressure valve 22 are adjusted to target values by the manual pump 23, the ring pressure value is adjusted to the target values by the ring pressure pump 40, and the temperatures of the first temperature control box 54, the second temperature control box 55, and the third temperature control box 56 are set to the target values;
(3) CO in gas cylinder 1 2 The gas is stored in a storage tank 4 after being pressurized by a gas booster pump 2;
(4) CO in the tank 4 2 Is injected into the first piston container 10, and CO in the first piston container 10 is pumped by a power pump 15 2 Injecting through one end of the core holder;
(5) Closing valves at two ends of the core holder, simulating well closing for a certain time, and then opening a valve at one end of the core holder for injecting the throughput, wherein fluid is ejected from the same end of the core holder and flows to a gas-liquid metering system;
(6) The gas-liquid metering system is used for metering the gas and liquid quantity of the fluid, the gas fluid discharged from the outlet end of the core holder is separated into gas and liquid through the gas-liquid separator 46, the gas is metered through the first flowmeter 47, the liquid is metered through the liquid metering device, the throughput effect is analyzed, and the one-time throughput operation is completed;
(7) Repeating the steps (4) - (6) for a plurality of times until the throughput injected from one end of the core holder is equal to the throughput flowing out from the same end of the core holder in the throughput operation for more than three times continuously, and when the discharged oil quantity is zero, the throughput experiment is completed, the injected throughput and the amount of the substances such as oil, gas and water which are swallowed and discharged are recorded, and the throughput effect is analyzed.
Wherein in CO 2 In the throughput simulation experiment, taking the long core holder 30 as an example, the steps (4) and (5) are specifically to take the CO in the storage tank 4 as an example 2 Injecting into the first piston container 10, closing the sixth valve 37 and the third valve 35, and using the power pump 15 to pump CO from the first piston container 10 2 Injecting the long core holder 30 through a fifth valve 36; the fifth valve 36 is closed, at this time, the fifth valve 36 and the sixth valve 37 are both closed, after a certain period of time of simulated well closing, the third valve 35 and the fifth valve 36 are opened, and the fluid flows out from the long core holder 30 through the fifth valve 36, and then flows to the downstream gas-liquid metering system through the communicating pipe 34 and the third valve 35. It will be appreciated that either the long core holder 30 or the short core holder 31 may be selected when performing throughput simulation experiments using the system of the present invention.
The following specifically describes a specific process of a displacement simulation experiment by taking water-gas alternating displacement as an example, and the specific process comprises the following steps:
(1) Checking the air tightness of the system, loading a rock sample of saturated oil into a core holder, and vacuumizing the system;
(2) The pressure values of the first back pressure valve 21 and the second back pressure valve 22 are adjusted to target values by the manual pump 23, the ring pressure value is adjusted to the target values by the ring pressure pump 40, and the temperatures of the first temperature control box 54, the second temperature control box 55, and the third temperature control box 56 are set to the target values;
(3) CO in gas cylinder 1 2 The gas is stored in a storage tank 4 after being pressurized by a gas booster pump 2;
(4) CO in the tank 4 2 Injecting into the first piston container 10, S1: injecting a certain amount of gas in the first piston container 10 into the core holder for displacement through the first back pressure valve 21 according to a certain displacement by using the power pump 15; s2: injecting a certain amount of clean water in a water tank 16 into a core holder for displacement according to a certain displacement through a fourth valve 14 and a first back pressure valve 21 by using a power pump 15, and repeating the steps S1 and S2 for water-gas alternate displacement;
(5) The gas-liquid metering system is used for metering the gas and liquid amount at the outlet end of the core holder, the gas-liquid mixture flowing out of the outlet end of the core holder is separated into gas and liquid through the gas-liquid separator 46, the gas is metered through the first flowmeter 47, the liquid is metered through the liquid metering device, and the displacement effect is analyzed.
In performing the alternate water and gas displacement experiments, either the long core holder 30 or the short core holder 31 may be selected.
Besides the carbonized water displacement simulation experiment, the system can also be used for performing displacement simulation experiments of other gases and liquids, for example, the system is utilized to compare and develop evaluation experiments of oil displacement effects such as gas displacement, water-gas alternate displacement and the like, gas injection parameters (experiment temperature, pressure, injection displacement, injection timing, injection quantity, gas injection mode and the like) optimization experiments, gas displacement characteristic calculation research (displacement pressure, produced oil-gas component, water content, oil displacement efficiency change rule and the like) and fluidity control research in the gas displacement process. The injection displacement may be of constant magnitude, or may be increased, decreased, or otherwise irregular.
The system of the invention is capable of performing in addition to CO 2 In addition to throughput simulation experiments, throughput simulation experiments of other gases can be performed, for example, the system of the invention is utilized to compare and develop steam/CO 2 /N 2 Evaluation experiments of oil displacement effects such as throughput and the like, optimization parameters of gas injection throughput (experiment temperature, pressure, injection displacement, injection time, injection quantity, gas injection mode and the like), oil displacement characteristic research (displacement pressure, produced oil and gas components, water content, oil displacement efficiency change law and the like) and fluidity control research in the gas displacement process.
In the description of the present specification, a description of the terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms may be directed to different embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. Novel CO 2 A displacement and throughput system, comprising:
the gas injection system comprises a gas cylinder, a gas booster pump is arranged on an outlet pipeline of the gas cylinder, a storage tank is arranged on an outlet pipeline of the gas booster pump, and a pressure regulating valve is arranged on an outlet pipeline of the storage tank;
the liquid injection system is arranged at the downstream of the gas injection system and comprises a piston stirring container and a plurality of piston containers, wherein the piston stirring container is arranged in parallel with the piston containers, the lower parts of the piston stirring container and the piston containers are connected with a power pump, and a stirring device is arranged in the piston stirring container;
the model system is arranged at the downstream of the liquid injection system and comprises a ring-pressure pump and at least one core holder, wherein the ring-pressure pump is used for adjusting the ring pressure of the core holder, and the outlet end and the inlet end of the core holder are communicated through a communicating pipe;
The pressure control system comprises a back pressure valve and a manual pump, the back pressure valve is arranged at the outlet end and the inlet end of the core holder, and the manual pump is used for adjusting the pressure of the back pressure valve;
the gas-liquid metering system is arranged at the downstream of the model system and comprises a gas-liquid separator, a first flowmeter arranged at the outlet end of the upper part of the gas-liquid separator and a liquid metering device arranged at the outlet end of the lower part of the gas-liquid separator;
the temperature control system comprises a first temperature control box, a second temperature control box and a third temperature control box, wherein the first temperature control box is arranged at the periphery of the gas injection system and the liquid injection system, the second temperature control box is arranged at the periphery of the core holder, and the third temperature control box is arranged at the periphery of the gas-liquid metering system;
and the vacuumizing device is arranged on a branch of the outlet pipeline of the piston stirring container.
2. The system of claim 1, wherein the piston reservoirs comprise a first piston reservoir, a second piston reservoir, and a third piston reservoir disposed in parallel, the first piston reservoir, the second piston reservoir, and the third piston reservoir being configured to house a gas, crude oil, and a chemical solution, respectively.
3. The system of claim 1, wherein a differential pressure sensor is disposed on the pipeline between the outlet end and the inlet end of the core holder.
4. The system of claim 1, wherein the backpressure valve comprises a first backpressure valve disposed at the core holder inlet end and a second backpressure valve disposed at the core holder outlet end.
5. The system of claim 4, wherein the output of the manual pump is connected to a first buffer tank, a first valve is disposed in a line between the first buffer tank outlet and the first back pressure valve, and a second valve is disposed in a line between the first buffer tank outlet and the second back pressure valve.
6. The system of claim 5, wherein a first relief valve is provided in a branch of the tank inlet line, a second relief valve is provided in a branch of the upper line of the piston agitator vessel, and a third relief valve is provided in a branch of the first buffer tank outlet line.
7. The system of claim 4, wherein the inlet end of the reservoir, the upper pipeline of the piston vessel, the core holder outlet and inlet ends, the first buffer tank outlet end, and the gas-liquid separator inlet end are provided with pressure gauges and temperature gauges.
8. The system of claim 1, wherein a dryer is disposed between the gas-liquid separator and the first flow meter, and a first one-way valve is disposed between the dryer and the first flow meter.
9. The system of claim 1, wherein the liquid metering device comprises a balance and a glass container placed on the balance.
10. Novel CO 2 A displacement and throughput method, characterized in that the system according to any one of claims 1-9 is used, comprising a displacement simulation experiment and a throughput simulation experiment,
wherein CO 2 The displacement simulation experiment for dissolving to form carbonized water comprises the following steps:
(1) Checking the air tightness of the system, loading a rock sample of saturated oil into a core holder, and vacuumizing the system;
(2) The pressure value of the back pressure valve is regulated by a manual pump, the ring pressure value is regulated by a ring pressure pump, and the temperatures of the first temperature control box, the second temperature control box and the third temperature control box are set as target values;
(3) CO in a gas cylinder 2 After being pressurized by a gas booster pump, the gas is stored in a storage tank;
(4) CO in the storage tank 2 Injecting into the first piston container to make CO in the first piston container 2 Pumping the chemical solution in the third piston container into a piston stirring container according to a certain proportion, stirring and mixing uniformly to form carbonized water, and recording the concentration of the carbonized water;
(5) Injecting carbonized water into the core holder by using a power pump to perform a displacement simulation experiment, and recording the injection quantity of the carbonized water;
(6) Measuring the gas and liquid amount at the outlet end of the core holder by using a gas and liquid metering system, and analyzing the displacement effect of carbonized water;
CO 2 the throughput simulation experiment comprises the following steps:
(1) Checking the air tightness of the system, loading a rock sample of saturated oil into a core holder, and vacuumizing the system;
(2) The pressure value of the back pressure valve is regulated by a manual pump, the ring pressure value is regulated by a ring pressure pump, and the temperatures of the first temperature control box, the second temperature control box and the third temperature control box are set as target values;
(3) CO in a gas cylinder 2 After being pressurized by a gas booster pump, the gas is stored in a storage tank;
(4) CO in the storage tank 2 Injecting into the first piston container, and using the power pump to pump CO in the first piston container 2 Injecting through one end of the core holder;
(5) Closing valves at two ends of the core holder, simulating well closing for a certain time, opening the valve at one end of the core holder for injecting the handling object, and discharging fluid from the same end of the core holder, wherein the fluid flows to a gas-liquid metering system;
(6) The gas-liquid metering system is used for metering the gas-liquid amount of the fluid, the throughput effect is analyzed, and the throughput operation is completed at this time;
(7) Repeating the steps (4) - (6) for a plurality of times until the throughput injected from one end of the core holder is equal to the throughput flowing out from the same end of the core holder and the discharged oil amount is zero in more than three continuous throughput operations, and completing the throughput experiment.
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| CN202310519998.5A CN116591647A (en) | 2023-05-09 | 2023-05-09 | Novel CO 2 Displacement and throughput system and method |
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| CN118090511A (en) * | 2024-04-18 | 2024-05-28 | 东北石油大学三亚海洋油气研究院 | Experimental device and injection method for improving natural gas recovery efficiency and carbon dioxide sequestration efficiency based on single pump control |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118090511A (en) * | 2024-04-18 | 2024-05-28 | 东北石油大学三亚海洋油气研究院 | Experimental device and injection method for improving natural gas recovery efficiency and carbon dioxide sequestration efficiency based on single pump control |
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