CN110243672B - CO (carbon monoxide)2Supercharging metering system and using method - Google Patents
CO (carbon monoxide)2Supercharging metering system and using method Download PDFInfo
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- G—PHYSICS
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
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Abstract
The invention provides a CO 2 pressurizing and metering system and a using method thereof, wherein the CO 2 pressurizing and metering system comprises a liquid storage tank, a mixed liquid metering pump, a gas storage bottle, a cooler, a CO 2 metering pump, a first piston container and a rock sample, wherein a water outlet of the liquid storage tank is connected with the upper part of the first piston container through the mixed liquid metering pump; the gas storage bottle is used for storing CO 2 gas, the gas outlet of the gas storage bottle is connected with the lower part of the first piston container through the cold machine and the CO 2 metering pump in sequence, and the CO 2 outlet at the lower part of the first piston container is connected with the inlet of the rock sample; the invention provides an experiment system for a stable CO 2 anhydrous fracturing fluid injection function and a use method thereof.
Description
Technical Field
The invention relates to the chemical field related to petroleum and natural gas exploitation technology or CO 2, in particular to a CO 2 pressurizing and metering system and a using method thereof.
Background
Because low-permeability petroleum and natural gas reservoirs are difficult to directly mine, the oil and gas reservoirs are transformed by a fracturing technology (hydraulic fracturing and CO 2 fracturing), and the method is the most practical and effective means. The research of the CO 2 fracturing technology is a hot spot direction in the current industry, and it is particularly important to develop a fracturing fluid supply system which can provide stable fracturing fluid supply for a multifunctional fracturing simulation test system such as pure CO 2 fracturing and improved CO 2 fracturing (chemical reagent is added in CO 2), and perform better systematic research on the fracturing pressure and fracturing effect of CO 2 fracturing by means of the fracturing fluid supply system.
The existing fracturing simulation test system in the industry has single function, can generally only perform hydraulic fracturing, and cannot perform the test simulation function of CO 2 fracturing. The individual fracturing simulation test systems contain the functionality of the CO 2 fracturing simulation, but may have several disadvantages when conducting CO 2 fracturing: (1) The design of the corresponding chemical reagent adding function has the defect that the design is simpler in the aspect of controlling the pressure when the fracturing fluid is mixed and output, so that the output pressure of the fracturing fluid is not stable enough, the pulse possibly exists, the measuring effect is influenced, and the metering is inaccurate. (2) The concentration control and metering precision of the chemical reagent in the CO 2 fracturing fluid are insufficient. (3) The stirring and mixing aspects of the fracturing fluid are insufficient, stirring is insufficient, the rotating speed can not be adjusted during stirring, or the stirrer is easily corroded by chemical reagents or CO 2. (4) During experiments, after the rock sample breaks, the output of the fracturing fluid cannot be stopped immediately, so that the experimental sample is wasted and even the experimental safety hazard is caused. In summary, the lack of comprehensive means to better control the CO 2 fracturing process brings great inconvenience to the development of fracturing fracture test studies.
Disclosure of Invention
The invention aims to provide a CO 2 pressurizing and metering system and a using method thereof, which solve the defects in the prior art.
In order to achieve the above purpose, the invention adopts the following technical scheme:
The invention provides a CO 2 pressurizing and metering system, which comprises a liquid storage tank, a mixed liquid metering pump, a gas storage bottle, a cooler, a CO 2 metering pump, a first piston container and a rock sample, wherein a water outlet of the liquid storage tank is connected with the upper part of the first piston container through the mixed liquid metering pump; the gas storage bottle is used for storing CO 2 gas, the gas outlet of the gas storage bottle is connected with the lower part of the first piston container through the cold machine and the CO 2 metering pump in sequence, and the CO 2 outlet at the lower part of the first piston container is connected with the inlet of the rock sample.
Preferably, the CO 2 pressurizing and metering system further comprises a hand pump, wherein the outlet of the hand pump is provided with a second safety valve, a branch is arranged at the outlet of the hand pump, the outlet of the branch is connected with a first back pressure valve, and the first back pressure valve is arranged on a connecting pipeline between the CO 2 metering pump and the lower part of the first piston container;
A sixth valve and a second pressure gauge are sequentially arranged on a connecting channel between the outlet of the branch of the hand pump and the first back pressure valve; a first buffer tank is arranged between the first back pressure valve and the sixth valve; the first buffer tank is provided with a first safety valve.
Preferably, a fourth valve, a CO 2 metering pump and a fifth valve are sequentially arranged on a connecting channel between the cooler and the first back pressure valve.
Preferably, the outlet of the hand pump is also provided with a branch, the outlet of the branch is connected with the bottom inlet of the second piston container, and the upper part of the second piston container is filled with chemical reagent; the upper outlet of the second piston container is connected with the lower inlet of the first piston container, and a seventh valve is arranged on a connecting channel between the upper outlet and the lower inlet of the second piston container.
Preferably, a magnetic stirrer for mixing the chemical agents is installed at the lower portion of the first piston container.
Preferably, the outlet of the hand pump is also provided with a branch, the outlet of the branch is connected with a second back pressure valve, and the second back pressure valve is arranged on a connecting pipeline between the lower part of the first piston container and the rock sample;
An eighth valve and a third pressure gauge are sequentially arranged on a connecting pipeline between the outlet of the branch of the hand pump and the second back pressure valve; the loop outlet of the second back pressure valve is connected with a second buffer tank;
a back pressure valve is arranged between the second back pressure valve and the rock sample;
The outlet of the second buffer tank is provided with a third safety valve.
The using method of the CO 2 pressurizing and metering system is based on a CO 2 pressurizing and metering system, the system comprises a liquid storage tank, a mixed liquid metering pump, a gas storage bottle, a cooler, a CO 2 metering pump, a first piston container and a rock sample, wherein a water outlet of the liquid storage tank is connected with the upper part of the first piston container through the mixed liquid metering pump; the gas storage bottle is used for storing CO 2 gas, the gas outlet of the gas storage bottle is connected with the lower part of the first piston container through the cold machine and the CO 2 metering pump in sequence, and the CO 2 outlet at the lower part of the first piston container is connected with the inlet of the rock sample; the method comprises the following steps:
the CO 2 gas in the gas storage bottle is cooled by a cooler and then becomes liquid, and the liquid is conveyed to the lower part of the first piston container;
injecting clear water stored in the liquid storage tank to the upper part of the first piston container, displacing fracturing fluid at the lower part of the first piston container into a rock sample, and performing a stable CO 2 anhydrous fracturing test.
Preferably, the CO 2 pressurizing and metering system further comprises a hand pump, the outlet of the hand pump is provided with a second safety valve, the outlet of the second safety valve is provided with a branch, the outlet of the branch is connected with a first back pressure valve, and the first back pressure valve is arranged on a connecting pipeline between the CO 2 metering pump and the lower part of the first piston container;
a sixth valve and a second pressure gauge are sequentially arranged on a connecting channel between the outlet of the branch of the hand pump and the first back pressure valve;
A first buffer tank is arranged between the first back pressure valve and the hand pump; the first buffer tank is provided with a first safety valve;
The outlet of the hand pump is also provided with a branch, the outlet of the branch is connected with the bottom inlet of the second piston container, and a certain amount of chemical reagent is filled at the upper part of the second piston container; the upper outlet of the second piston container is connected with the lower inlet of the first piston container, and a seventh valve is arranged on a connecting channel between the upper outlet and the lower inlet of the second piston container;
the outlet of the hand pump is also provided with a branch, the outlet of the branch is connected with a second back pressure valve, and the second back pressure valve is arranged on a connecting pipeline between the lower part of the first piston container and the rock sample;
When the device is used, the seventh valve is opened, the sixth valve and the eighth valve are closed, clean water is injected into the lower part of the second piston container through the hand pump, and chemical reagent contained in the upper part of the second piston container is pressurized and displaced to the lower part of the first piston container.
Preferably, the sixth valve is opened, the seventh valve and the eighth valve are closed, clean water is injected into the first back pressure valve through a hand pump, and the start pressure of CO 2 pumped into the lower part of the first piston container by the CO 2 metering pump is controlled.
Preferably, the eighth valve is opened, the sixth valve and the seventh valve are closed, and clean water is injected into the second back pressure valve by a hand pump to control the initial pressure of the fracturing fluid injected into the rock sample from the first piston container.
Compared with the prior art, the invention has the beneficial effects that:
According to the CO 2 pressurizing and metering system and the using method, the CO 2 pressurizing and injecting system is added on conventional true triaxial fracturing simulation equipment, during experiments, certain confining pressure is applied to experimental rock samples through the true triaxial fracturing simulation equipment, the cracking pressure and the cracking effect of the rock samples are researched, after fracturing is completed, the cracking effect can be judged by combining analysis of the morphological dimensions of cracks on the surfaces of the rock samples, acoustic emission monitoring of cracking characteristics of internal cracks and CT scanning of the internal crack characteristics. The quality and the size of the crushed rock sample after fracturing can be measured, so that the corresponding fractal dimension can be obtained, and the fracturing effect can be evaluated through the fractal dimension by means of a fractal rock mechanical method;
According to the invention, the injection function of CO 2 anhydrous fracturing fluid is realized by adopting the first piston container, firstly CO 2 liquid is injected into the lower part of the first piston container, then clean water in the liquid storage tank is injected into the top of the first piston container, the CO 2 fracturing fluid at the lower part is driven by the clean water pressure at the upper part to be injected into a rock sample in a true triaxial fracturing simulation device, the cracking pressure and the fracturing effect of an experimental rock sample are studied, and as the injection of the CO 2 liquid pressure and the fracturing fluid are controlled by a back pressure valve, the stable CO 2 anhydrous fracturing fluid injection function is realized. The injection displacement and injection pressure can be regulated by means of a mixed liquor metering pump.
Furthermore, the system is also provided with a chemical reagent injection system, and pure CO 2 fracturing or CO 2 fracturing with chemical reagents can be respectively carried out by selecting branches according to requirements.
Furthermore, the system realizes the control of the initial pressure of CO 2 injected into the lower part of the first piston container through the communication of the hand pump, the sixth valve and the first back pressure valve.
Furthermore, the system realizes the control of the initial pressure of the fracturing fluid injected into the rock sample through the communication of the hand pump, the eighth valve and the second back pressure valve. In the experimental process, when the rock sample is completely broken, the second back pressure valve can immediately finish the output of the fracturing fluid, so that the fracturing fluid in the first piston container is prevented from flowing out completely and rapidly, and unnecessary waste of the fracturing fluid or experimental danger is avoided.
Further, the first buffer tank can play a role in pressure buffering, so that the system pressure is kept stable.
Drawings
FIG. 1 is a schematic diagram of the CO 2 boost metering control system of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Compared with conventional true triaxial fracturing simulation equipment with only hydraulic fracturing function, the experimental system has the advantages that the mixed pressurized injection and accurate metering functions of CO 2 and chemical reagents are increased, and the fracturing injection function of CO 2 is controlled better by means of the system. During the experiment, certain confining pressure is applied to the experimental rock sample by means of conventional true triaxial fracturing simulation equipment (known in the industry), so that better researches on cracking pressure, cracking effect and the like can be facilitated.
As shown in fig. 1, the CO 2 boost metering control system provided by the invention comprises a liquid storage tank 1, a first valve 2, a mixed liquor metering pump 3, a second valve 4, a gas storage bottle 5, a third valve 6, a chiller 7, a first pressure gauge 8, a fourth valve 9, a CO 2 metering pump 10, a fifth valve 11, a first back pressure valve 12, a magnetic stirrer 13, a first piston container 14, a high pressure gauge 15, a first buffer tank 16, a first safety valve 17, a second pressure gauge 18, a sixth valve 19, a hand pump 20, a second safety valve 21, a second piston container 22, a seventh valve 23, an eighth valve 24, a second buffer tank 25, a third safety valve 26, a third pressure gauge 27, a second back pressure valve 28, a back pressure valve 29 and a rock sample 30, wherein the liquid storage tank 1 stores clean enough water to provide sufficient displacement liquid for the mixed liquor metering pump 3; the gas cylinder 5 is mainly used for storing CO 2 gas and providing a gas source for experiments.
The liquid storage tank 1 is connected with the upper part of the first piston container 14 through the first valve 2, the mixed liquid metering pump 3 and the second valve 4 in sequence; the gas cylinder 5 is connected with the lower part of the first piston container 14 through a third valve 6, a cooler 7, a fourth valve 9, a CO 2 metering pump 10, a fifth valve 11 and a first back pressure valve 12 in sequence.
A temperature control device is arranged on the first piston container 14, so that the temperature of the CO 2 and the chemical reagent at the lower part of the first piston container can be controlled conveniently, and the temperature can be regulated to a set experimental temperature.
Wherein, the cooler 7 is additionally connected with a first pressure gauge 8; the upper part of the first piston container 14 is also connected with a high-pressure manometer 15, and the lower part is provided with a magnetic stirring container 13.
The lower part of the first piston container 14 is connected to the inlet of the rock sample 30 via a second back pressure valve 28 and a back pressure valve 29 in sequence.
The hand pump 20 is designed, and a second safety valve 21 is arranged at the outlet of the hand pump 20 to play a role in overpressure protection; the outlet of the hand pump 20 is provided with three branches, wherein:
The outlet of the first branch is connected to the lower part of the second piston container 22, the upper part of the second piston container 22 contains chemical reagent, and the upper part of the second piston container 22 is connected to the lower part of the first piston container 14 through a seventh valve 23.
The outlet of the second branch is connected with the first back pressure valve 12, and a sixth valve 19 and a second pressure gauge 18 are sequentially arranged on a connecting pipeline between the outlet of the second branch and the first back pressure valve 12; the circuit outlet of the first back pressure valve 12 is connected to a first buffer tank 16.
Furthermore, a first safety valve 17 is arranged on the first buffer tank 16, which plays a role in overpressure protection.
The outlet of the third branch is connected with a second back pressure valve 28, and an eighth valve 24 and a third pressure gauge 27 are sequentially arranged on a connecting pipeline between the outlet of the third branch and the second back pressure valve 28; the loop outlet of the second back pressure valve 28 is connected with the second buffer tank 25; the second surge tank 25 is provided with a third relief valve 26.
The mixed liquid metering pump 3 and the CO 2 metering pump 10 are constant-speed constant-pressure pumps, can accurately output according to constant discharge capacity and constant pressure, and can regulate the discharge capacity and the pressure.
The side surfaces of the first buffer tank 16 and the second buffer tank 25 are respectively provided with a first safety valve 17 and a third safety valve 26; the outlet of the hand pump 20 is provided with a second safety valve 21 to prevent the danger caused by the excessive pressure in the system.
The cooler 7 can adjust the temperature of CO 2 flowing through the pipeline and refrigerate CO 2 into liquid state, so that stable output of a subsequent pump is facilitated.
The first back pressure valve 12 is controlled by a hand pump 20 and a sixth valve 19 to regulate the pressure resistance passing through the first back pressure valve 12; the first buffer tank 16 connected thereto can play a role of buffering, helping to smoothly adjust the pressure.
The magnetic stirrer 13 can flexibly adjust the stirring rotation speed, and adopts a magnetic stirring mode to prevent the corrosion of the added chemical reagent and CO 2 to the stirrer.
The second back pressure valve 28 is controlled by the hand pump 20 and the eighth valve 24 to regulate the pressure resistance across the second back pressure valve 28. The second buffer tank 25 connected thereto can play a role of buffering, helping to smoothly adjust the pressure.
The back pressure valve 29 prevents the backflow of fracturing fluid and other fluids in the pipeline.
The rock sample 30 is a sample for a fracturing simulation true triaxial experiment, which may be dimensioned as desired, to which he needs to apply a confining pressure by means of conventional true triaxial equipment.
The upper part of the second piston container 22 can contain chemical reagents required for experiments, and the hand pump 20 can be used for injecting clean water to apply a certain pressure to the lower part of the piston, so that the chemical reagents at the upper part of the second piston container 22 are injected into the lower part of the first piston container 14 through a pipeline and are mixed with CO 2 therein.
The first piston container 14 has a temperature adjusting function, the temperature of the CO 2 and the chemical reagent in the first piston container is controlled, after the temperature is adjusted to an ideal experiment temperature, clean water is injected through the mixed liquid metering pump 3 to replace the piston of the first piston container 14, and the fracturing fluid or CO 2 at the lower part is injected into the rock sample 30 through the second back pressure valve 28 and the back pressure valve 29 to carry out fracturing experiments.
The hand pump 20 adjusts the injection start pressure of the fracturing fluid injected into the rock sample 30 from the first piston container 14 by adjusting the second back pressure valve 28 through the eighth valve 24 and the pipeline. During the experiment, when the rock sample is completely broken, the second back pressure valve 28 can immediately end the output of the fracturing fluid, so as to prevent the fracturing fluid in the first piston container 14 from completely and rapidly flowing out, thereby causing unnecessary waste of the fracturing fluid or experimental danger.
The CO 2 in the gas storage bottle 5 is cooled by the third valve 6 and the cooler 7 in sequence and becomes liquid, and enters the CO 2 metering pump 10 through the fourth valve 9 so as to be conveniently conveyed into a pipeline, and enters the lower part of the first piston container 14 through the fifth valve 11 and the first back pressure valve 12. The intercooler 7 is additionally connected with a first pressure gauge 8, so that the system pressure can be conveniently detected.
All connecting pipelines of the system adopt 316L pipelines to prevent acid corrosion of fracturing fluid to the pipelines, and the pipelines are wrapped by heat insulation materials. Particularly, the first back pressure valve 12 and the second back pressure valve 28 are externally provided with heating and temperature control functions, so that the pressure is prevented from being released, and the pressure is easy to be blocked and the pipeline is prevented from being blocked.
The parameters such as displacement, temperature and pressure can be used for collecting data through the data collection control card and for carrying out real-time monitoring and data collection on the flow, temperature and pressure in the pipeline.
The using method specifically comprises the following steps:
(1) The gas storage bottle 5, the third valve 6 and the fourth valve 9 are opened, CO 2 gas in the gas storage bottle 5 is cooled by the third valve 6 and the cooler 7 in sequence and then becomes liquid, the liquid enters the CO 2 metering pump 10 through the fourth valve 9 and is conveniently conveyed into a pipeline, the liquid enters the lower part of the first piston container 14 through the fifth valve 11 and the first back pressure valve 12, and simultaneously the displacement, the injection pressure and the mass of injected CO 2 are collected by the system. The intercooler 7 is additionally connected with a first pressure gauge 8, so that pressure can be conveniently detected.
(2) Three branches connected with the outlet of the hand pump 20 are controlled by operating the sixth valve 19, the seventh valve 23 and the eighth valve 24 respectively:
A. The seventh valve 23 is opened, the sixth valve 19 and the eighth valve 24 are closed, and the first branch of the outlet of the hand pump 20 is controlled: by manually pumping the pump 20 to fill the upper portion of the second piston container 22 with fresh water, the chemical agent is pressurized to displace the chemical agent through the seventh valve 23 into the lower portion of the first piston container 14 and the amount of chemical agent to be filled is metered.
The hand pump 20 enables metering of the volume of clean water injected into the lower portion of the second piston container 22, which is the same volume as the chemical displaced into the lower portion of the first piston container 14, thus enabling the mass ratio of chemical to CO 2 used to form the fracturing fluid after metering and mixing.
B. The sixth valve 19 is opened, the seventh valve 23 and the eighth valve 24 are closed, the second branch of the outlet of the hand pump 20 is controlled, clean water is injected through the hand pump 20, and the first buffer tank 16 and the first back pressure valve 12 are connected through the sixth valve 19 in the pipeline, so that the initial pressure of the CO 2 metering pump 10 for pumping CO 2 through the first back pressure valve 12 and into the first piston container 14 is conveniently controlled.
C. The sixth valve 19 is closed, the seventh valve 23 is opened, the eighth valve 24 is opened, and the third branch of the outlet of the hand pump 20 is controlled: the clean water is injected by the hand pump 20, and the injection start pressure of the fracturing fluid injected from the first piston container 14 into the rock sample 30 is adjusted by controlling the second back pressure valve 28 through the eighth valve 24 and the pipeline in the pipeline. During the experiment, when the rock sample is completely broken, the second back pressure valve 28 can immediately end the output of the fracturing fluid, so as to prevent the fracturing fluid in the first piston container 14 from flowing out quickly, thereby causing unnecessary waste of the fracturing fluid or causing experimental danger. The third pressure gauge 27 can monitor the internal pressure of the second buffer tank 25, and a third safety valve 26 is arranged on the second buffer tank 25 to prevent the overpressure and facilitate the safety of the system.
(3) Note that the upper part of the first piston container 14 is also connected with a high-pressure manometer 15 to monitor the internal pressure to prevent the system from being overpressurized, the lower part is designed with a magnetic stirrer 13 to fully stir the injected CO 2 and chemical reagent, and the rotating speed can be adjusted according to the experiment requirement, so that the internal substances are uniformly mixed, and meanwhile, the internal fracturing fluid is heated to the target temperature required by the experiment.
(4) Whether the seventh valve 23 is opened or not can be flexibly selected according to the needs, whether the chemical reagent in the second piston container 22 is added or not is selected, and the branch is selected to respectively carry out pure CO 2 fracturing and improved CO 2 fracturing (chemical reagent is added) simulation test. In addition, the concentration of the chemical agent in the formulated fracturing fluid may be controlled by adjusting the amounts of injected CO 2 and chemical agent.
(5) And loading the target rock sample into true triaxial equipment, adjusting the confining pressure of the experimental target, and connecting a pipeline with the experimental system.
(6) The first valve 2 and the second valve 4 are opened, clean water stored in the liquid storage tank 1 is injected into the upper part of the first piston container 14 by the mixed liquid metering pump 3 to replace the piston of the first piston container 14, so that fracturing fluid is injected into a rock sample 30 through the back pressure valve 29. And simultaneously monitoring and recording the data such as the injection displacement, the pressure and the like of the metering pump 3.
(7) Analysis was observed after fracture of the rock sample 30. After the fracturing experiment is completed, the fracturing effect can be judged by analyzing the morphological size of the fracturing crack on the surface of the rock sample, monitoring the cracking characteristics of the internal crack by acoustic emission and combining the characteristics of the internal crack by CT scanning. The quality and the size of the crushed rock sample after fracturing can be measured, so that the corresponding fractal dimension can be obtained, and the fracturing effect can be evaluated through the fractal dimension by means of a fractal rock mechanics method. The method can be comprehensively used to evaluate the fracturing effect.
Claims (6)
1. The CO 2 pressurizing and metering system is characterized by comprising a liquid storage tank (1), a mixed liquid metering pump (3), a gas storage bottle (5), a cooler (7), a CO 2 metering pump (10), a first piston container (14) and a rock sample (30), wherein a water outlet of the liquid storage tank (1) is connected with the upper part of the first piston container (14) through the mixed liquid metering pump (3); the gas storage bottle (5) is used for storing CO 2 gas, the gas outlet of the gas storage bottle is connected with the lower part of the first piston container (14) through the cold machine (7) and the CO 2 metering pump (10) in sequence, and the CO 2 outlet at the lower part of the first piston container (14) is connected with the inlet of the rock sample (30);
The CO 2 pressurizing and metering system further comprises a hand pump (20), a second safety valve (21) is arranged at the outlet of the hand pump (20), a branch is arranged at the outlet of the second safety valve (21), the outlet of the branch is connected with a first back pressure valve (12), and the first back pressure valve (12) is arranged on a connecting pipeline between the CO 2 metering pump (10) and the lower part of the first piston container (14);
a sixth valve (19) and a second pressure gauge (18) are sequentially arranged on a connecting channel between the outlet of the branch of the hand pump (20) and the first back pressure valve (12);
A first buffer tank (16) is arranged between the first back pressure valve (12) and the hand pump (20); a first safety valve (17) is arranged on the first buffer tank (16);
The outlet of the hand pump (20) is also provided with a branch, the outlet of the branch is connected with the bottom inlet of the second piston container (22), and a certain amount of chemical reagent is filled at the upper part of the second piston container (22); the upper outlet of the second piston container (22) is connected with the lower inlet of the first piston container (14), and a seventh valve (23) is arranged on a connecting channel between the upper outlet and the lower inlet of the second piston container;
The outlet of the hand pump (20) is also provided with a branch, the outlet of the branch is connected with a second back pressure valve (28), and the second back pressure valve (28) is arranged on a connecting pipeline between the lower part of the first piston container (14) and the rock sample (30);
an eighth valve (24) and a third pressure gauge (27) are sequentially arranged on a connecting pipeline between the outlet of the branch of the hand pump (20) and the second back pressure valve (28);
A second buffer tank (25) is connected between the second back pressure valve (28) and the hand pump (20);
a back pressure valve (29) is arranged between the second back pressure valve (28) and the rock sample (30);
the second buffer tank (25) is provided with a third safety valve (26).
2. The CO 2 boost metering system according to claim 1, wherein a fourth valve (9), a CO 2 metering pump (10) and a fifth valve (11) are sequentially arranged on a connecting channel between the chiller (7) and the first back pressure valve (12).
3. A CO 2 boost metering system according to claim 1, wherein the lower part of the first piston container (14) is fitted with a magnetic stirrer (13) for mixing chemical and CO 2.
4. The using method of the CO 2 pressurizing and metering system is characterized in that the method is based on a CO 2 pressurizing and metering system, the system comprises a liquid storage tank (1), a mixed liquid metering pump (3), a gas storage bottle (5), a cooler (7), a CO 2 metering pump (10), a first piston container (14) and a rock sample (30), wherein a water outlet of the liquid storage tank (1) is connected with the upper part of the first piston container (14) through the mixed liquid metering pump (3); the gas storage bottle (5) is used for storing CO 2 gas, the gas outlet of the gas storage bottle is connected with the lower part of the first piston container (14) through the cold machine (7) and the CO 2 metering pump (10) in sequence, and the CO 2 outlet at the lower part of the first piston container (14) is connected with the inlet of the rock sample (30);
The method comprises the following steps:
The CO 2 gas in the gas storage bottle (5) is cooled by a refrigerator (7) and becomes liquid, and is conveyed to the lower part of the first piston container (14) by a CO 2 metering pump (10);
Injecting clear water stored in a liquid storage tank (1) to the upper part of a first piston container (14) through a mixed liquid metering pump (3), displacing fracturing fluid at the lower part of the first piston container (14) into a rock sample (30), and performing a stable CO 2 anhydrous fracturing test;
The CO 2 pressurizing and metering system further comprises a hand pump (20), a second safety valve (21) is arranged at the outlet of the hand pump (20), a branch is arranged at the outlet of the second safety valve (21), a first back pressure valve (12) is connected to the outlet of the branch, and the first back pressure valve (12) is arranged on a connecting pipeline between the CO 2 metering pump (10) and the lower part of the first piston container (14);
a sixth valve (19) and a second pressure gauge (18) are sequentially arranged on a connecting channel between the outlet of the branch of the hand pump (20) and the first back pressure valve (12);
A first buffer tank (16) is arranged between the first back pressure valve (12) and the hand pump (20); a first safety valve (17) is arranged on the first buffer tank (16);
The outlet of the hand pump (20) is also provided with a branch, the outlet of the branch is connected with the bottom inlet of the second piston container (22), and a certain amount of chemical reagent is filled at the upper part of the second piston container (22); the upper outlet of the second piston container (22) is connected with the lower inlet of the first piston container (14), and a seventh valve (23) is arranged on a connecting channel between the upper outlet and the lower inlet of the second piston container;
The outlet of the hand pump (20) is also provided with a branch, the outlet of the branch is connected with a second back pressure valve (28), and the second back pressure valve (28) is arranged on a connecting pipeline between the lower part of the first piston container (14) and the rock sample (30);
an eighth valve (24) and a third pressure gauge (27) are sequentially arranged on a connecting pipeline between the outlet of the branch of the hand pump (20) and the second back pressure valve (28);
When the piston type chemical reagent pump is used, the seventh valve (23) is opened, the sixth valve (19) and the eighth valve (24) are closed, clean water is injected into the lower part of the second piston container (22) through the hand pump (20), and the chemical reagent contained in the upper part of the second piston container (22) is pressurized and displaced to the lower part of the first piston container (14).
5. The method of using a CO 2 booster metering system according to claim 4, wherein the sixth valve (19) is opened, the seventh valve (23) and the eighth valve (24) are closed, and the pressure in the first back pressure valve (12) is increased by injecting clean water through the hand pump (20) to control the initial pressure of the CO 2 pumped into the lower portion of the first piston container (14) by the CO 2 metering pump (10).
6. The method of using a CO 2 booster metering system according to claim 4, wherein the eighth valve (24) is opened, the sixth valve (19) and the seventh valve (23) are closed, and fresh water is injected into the second back pressure valve (28) by the hand pump (20) to exert pressure for controlling the initial pressure of the fracturing fluid injected into the rock sample (30) from the first piston container (14).
Priority Applications (1)
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