CN107976529B - Multifunctional reaction kettle experiment system and experiment method - Google Patents
Multifunctional reaction kettle experiment system and experiment method Download PDFInfo
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Abstract
The system comprises a piston container, a gas cylinder, a cooler, a valve I and a mass flowmeter which are sequentially connected to the top of the piston container, a constant-speed constant-pressure pump is connected with the bottom of the piston container through a valve II, the top of the piston container is provided with a branch which is divided into three branches after passing through a valve III, the branches are respectively connected with the upper part, the middle part and the lower part of the left side of the reaction kettle through a valve IV, a valve V and a valve VI, and the four branches which are respectively connected with a sampler through a valve seven, a valve eight, a valve nine and a valve ten are respectively arranged at the upper part, the middle part, the lower part and the bottom of the right side of the reaction kettle; the invention also discloses an experimental method of the system; the invention is used for testing conventional hydraulic fracturing fluid or CO 2 Sampling and researching the concentration change condition of mineral ions after the interaction of the anhydrous fracturing fluid and the reservoir; can develop static test and dynamic test, analyze different layersThe condition of mineral ion change in the reaction liquid.
Description
Technical Field
The invention relates to the field of petroleum and natural gas development engineering, in particular to a multifunctional reaction kettle experiment system and an experiment method.
Background
Currently, the interaction of fracturing fluids with reservoirs is tested mainly against common hydraulic fracturing fluids used in the industry, such as gel fracturing fluids, or liquid fracturing fluids such as clear water fracturing fluids. When the actual fracturing fluid flows in the stratum fracture relative to the fracture surface, the single ion concentration of the fluid sample of the fracture is generally mainly influenced by the ion concentration of the fracturing fluid, and the single ion concentration is generally unchanged in a short time. Moreover, the current experimental research in industry generally places rock samples and fracturing fluid samples in a fixed container, and as the chemical action of fracturing fluid and reservoir minerals is carried out, certain single ion concentration in the container is likely to change, which may have influence on the interaction or reaction rate of the fracturing fluid and the reservoir, and the actual reservoir physical information cannot be accurately simulated and researched, and the change condition of mineral ion concentration is researched.
In recent years, a new fracturing technology, namely a carbon dioxide fracturing technology, is gradually heated, and more people begin to research the fracturing technology; the carbon dioxide fracturing fluid mainly comprises carbon dioxide and a certain chemical reagent. For CO currently in use 2 Gas fracturing fluids such as anhydrous fracturing fluids, the industry is temporarily free of mature equipment products to simulate their dynamic interactions with reservoirs.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention aims to provide a multifunctional reaction kettle experiment system and an experiment method, which useTesting conventional hydraulic fracturing fluid or CO 2 Sampling and researching the concentration change condition of mineral ions after the interaction of the anhydrous fracturing fluid and the reservoir; the static test and the dynamic test can be carried out, and the change condition of mineral ions in the reaction liquid at different layers can be analyzed.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the multifunctional reaction kettle experiment system comprises a piston container 5, a gas cylinder 1, a cooler 2, a valve I3 and a mass flowmeter 4 which are sequentially connected to the top of the piston container 5, a constant-speed constant-pressure pump 6 is connected with the bottom of the piston container 5 through a valve II 7, the top of the piston container 5 is additionally provided with a branch, the piston container is divided into three branches after passing through a valve III 8, the branches are respectively connected with the upper part, the middle part and the lower part of the left side of a reaction kettle 22 through a valve IV 9, a valve V10 and a valve VI 11, and the upper part, the middle part, the lower part and the bottom of the right side of the reaction kettle 22 are respectively connected with a sampler 19 through a valve IV 12, a valve V13, a valve V14 and a valve V18, and a valve IV 20 is connected to the bottom of the sampler 19.
The top of the piston container 5 can be opened, so that the liquid sample can be conveniently injected; conventional hydraulic fracturing fluid and carbon dioxide fracturing fluid (CO) are conveniently tested 2 And chemical reagent mixtures) under different conditions of temperature, pressure, concentration.
The volume of the piston container 5 is 5-20 times larger than that of the reaction kettle 22, and multiple test operations are carried out in order to facilitate liquid preparation.
The two sides of the reaction kettle 22 are provided with a plurality of inflow branches at the upper, middle and lower parts and outflow branches at the upper, middle, lower and bottom parts, which are selectively opened according to experimental requirements.
The reaction kettle 22 is arranged in the temperature control box 21, the stirrer 15 is arranged at the top of the reaction kettle 22, the tray 17 capable of supporting the rock sample 16 is arranged at the bottom of the reaction kettle 22, and the bottom of the tray 17 is of a grid structure, so that the bottom of the rock sample 16 cannot be contacted with the fracturing fluid sample.
The volume of the sampler 19 is smaller than that of the reaction kettle 22, so that liquid samples can be conveniently taken out from different layers of the upper layer, the middle layer, the lower layer and the bottom layer at any time for testing and analyzing after reaction in the reaction kettle 22 in the experimental process.
The experimental method of the multifunctional reaction kettle experimental system,
1) When the test fracturing fluid is CO 2 When the fracturing fluid is anhydrous:
firstly, all valves are closed, a piston container 5 is opened, and chemical reagents required by the fracturing fluid are injected into the piston container; then, valve one 3 is opened and CO in the gas cylinder 1 2 The gas flows once through the cooler 2, valve one 3, mass flowmeter 4 into the piston container 5, and CO flowing into the piston container 5 is metered by the mass flowmeter 4 2 The mass of the gas, combined with the mass of the chemical agent injected into the piston container 5, calculates the mass concentration of the chemical agent in the fracturing fluid in the piston container 5 by the following calculation formula: mass concentration of chemical agent = mass of chemical agent/(mass of chemical agent + CO injected into 5 2 Gas mass) ×100%) and then closing valve one 3;
the valve two 7 and the constant speed constant pressure pump 6 are opened to drive CO in the piston container 5 2 Pressurizing the anhydrous fracturing fluid to a target experimental pressure condition;
opening the reaction kettle 22 to place the rock sample 16 on the tray 11 inside the reaction kettle 22, and closing the reaction kettle 22; then adjusting the temperature control box 21 to a target experimental temperature;
then closing the valve II 7, opening the valve III 8, and opening one of the valve IV 9, the valve V10 and the valve VI 11 to fill the reaction kettle 22 with fracturing fluid so as to ensure that the surface of the rock sample 16 can be contacted with the fracturing fluid; after preset time intervals, one of a valve seven 12, a valve eight 13, a valve nine 14 and a valve ten 18 is selected to be opened according to the needs, so that a liquid sample in the reaction kettle 22 flows into the sampler 19 for test analysis;
the concentration control method of the injected fracturing fluid comprises the following steps: metering of injected CO by mass flowmeter 4 2 And the amount of chemical reagent injected into the piston container 5;
(1) Static test: after the fracturing fluid is filled in the reaction kettle 22 and reacts with the rock sample 16 for a period of time, the mineral ion change conditions in the reaction fluids at different layers are selectively tested and analyzed by sampling from the upper, middle, lower and bottom of the reaction kettle 22;
(2) Dynamic test: after the fracturing fluid is filled in the reaction kettle 22 and reacts with the rock sample 16 for a period of time, one of the four valves 9, the five valve 10 and the six valve 11 is selected to be opened, and liquid oxygen is continuously input from one of the upper part, the middle part and the lower part of the reaction kettle 22; meanwhile, the change conditions of mineral ions in the reaction liquid at different layers are analyzed through sampling test from the upper, middle, lower and bottom of the reaction kettle 22, so that the change conditions of mineral ions in the reaction liquid at different layers are analyzed completely;
changing the experimental temperature, pressure and fracturing fluid concentration conditions, and carrying out the test under the next experimental condition; after the experimental test is finished, opening a valve ten 18 and a valve eleven 20, and discharging and recycling samples;
2) When the test fracturing fluid is a liquid fracturing fluid:
the liquid fracturing fluid is injected into the piston container 5 just before the experiment is started, i.e. the experiment test is started, only the CO injection is not needed 2 Gas, other methods are unchanged, relative test of CO 2 The method of the fracturing fluid is simpler.
The 16 rock sample may be a particle of a certain size or a small pillar rock sample or a rock mass of a certain shape. The 15 stirrer may be turned on as needed to promote a sufficient reaction when the rock sample reacts with the fracturing fluid.
Compared with the prior art, the invention has the following advantages:
(1) Conventional hydraulic fracturing fluids and carbon dioxide fracturing fluids (CO) can be tested 2 And small amounts of chemical reagent mixtures) interact with the rock sample under different conditions of temperature, pressure, fracturing fluid concentration.
(2)CO 2 The concentration of the fracturing fluid can be controlled by injecting CO 2 The amount (metered by mass flowmeter 4) and the amount of chemical reagent injected into piston reservoir 5. The concentration of the common hydraulic fracturing fluid is directly prepared and then injected into the first 5-piston container.
(3) The reaction kettle 22 is designed with three inlets and four outlets, so that when the interaction between the fracturing fluid and the rock sample is tested under the conditions of different temperatures, pressures and fracturing fluid concentrations, different horizon injection and analysis of fracturing fluid samples taken from different upper horizons and lower horizons can be conveniently studied.
(4) The volume of the sampler 19 is far smaller than that of the reaction kettle 22, so that liquid samples can be conveniently taken out from different layers of the upper layer, the middle layer, the lower layer and the bottom layer at any time for testing and analyzing after reaction in the reaction kettle 22 in the experimental process.
(5) The bottom of the tray 17 is of a grid structure, so that the bottom of a rock sample can be fully contacted with a fracturing fluid sample, and the accuracy of reaction and experiment is not affected.
Drawings
FIG. 1 is a diagram of an experimental system of a multifunctional reaction kettle in the invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and the detailed description.
As shown in fig. 1, the multifunctional reaction kettle experimental system comprises a piston container 5, a gas cylinder 1, a cooler 2, a valve I3 and a mass flowmeter 4 which are sequentially connected to the top of the piston container 5, a constant-speed constant-pressure pump 6 is connected with the bottom of the piston container 5 through a valve II 7, the top of the piston container 5 is additionally provided with a branch which is divided into three branches after passing through a valve III 8, the branches are respectively connected with the upper part, the middle part and the lower part of the left side of a reaction kettle 22 through a valve IV 9, a valve V10 and a valve VI 11, and the upper part, the middle part, the lower part and the bottom of the right side of the reaction kettle 22 are respectively connected with a sampler 19 through a valve seven 12, a valve eight 13, a valve nine 14 and a valve ten 18, and the bottom of the sampler 19 is connected with a valve eleven 20.
The two sides of the reaction kettle 22 are provided with a plurality of inflow branches at the upper, middle and lower parts and outflow branches at the upper, middle, lower and bottom parts, which are selectively opened according to experimental requirements.
As a preferred embodiment of the present invention, the top of the piston container 5 can be opened, so as to facilitate the injection of the liquid sample; conventional hydraulic fracturing fluid and carbon dioxide fracturing fluid (CO) are conveniently tested 2 And chemical reagent mixtures) under different conditions of temperature, pressure, concentration.
As a preferred embodiment of the invention, the volume of the piston container 5 is 5-20 times larger than that of the reaction kettle 22, so as to facilitate the sequential liquid preparation and carry out multiple test operations.
As a preferred embodiment of the invention, the reaction kettle 22 is arranged in the temperature control box 21, the stirrer 15 is arranged at the top of the reaction kettle 22, the tray 17 capable of supporting the rock sample 16 is arranged at the bottom of the reaction kettle, and the bottom of the tray 17 is of a grid structure so that the bottom of the rock sample 16 cannot be contacted with the fracturing fluid sample.
As a preferred embodiment of the invention, the volume of the sampler 19 is smaller than that of the reaction kettle 22, so that the liquid sample can be conveniently taken out from different layers of the upper, middle, lower and bottom at any time for testing and analysis after the reaction in the reaction kettle 22 in the experimental process.
The invention relates to an experimental method of a multifunctional reaction kettle experimental system,
1) When the test fracturing fluid is CO 2 When the fracturing fluid is anhydrous:
firstly, all valves are closed, a piston container 5 is opened, and chemical reagents required by the fracturing fluid are injected into the piston container; then, valve one 3 is opened and CO in the gas cylinder 1 2 The gas flows once through the cooler 2, valve one 3, mass flowmeter 4 into the piston container 5, and CO flowing into the piston container 5 is metered by the mass flowmeter 4 2 The mass of the gas, combined with the mass of the chemical agent injected into the piston container 5, calculates the mass concentration of the chemical agent in the fracturing fluid in the piston container 5 by the following calculation formula: mass concentration of chemical agent = mass of chemical agent/(mass of chemical agent + CO injected into 5 2 Gas mass) ×100%) and then closing valve one 3;
the valve two 7 and the constant speed constant pressure pump 6 are opened to drive CO in the piston container 5 2 Pressurizing the anhydrous fracturing fluid to a target experimental pressure condition;
opening the reaction kettle 22 to place the rock sample 16 on the tray 11 inside the reaction kettle 22, and closing the reaction kettle 22; then adjusting the temperature control box 21 to a target experimental temperature;
then closing the valve II 7, opening the valve III 8, and opening one of the valve IV 9, the valve V10 and the valve VI 11 to fill the reaction kettle 22 with fracturing fluid so as to ensure that the surface of the rock sample 16 can be contacted with the fracturing fluid; after preset time intervals, one of a valve seven 12, a valve eight 13, a valve nine 14 and a valve ten 18 is selected to be opened according to the needs, so that a liquid sample in the reaction kettle 22 flows into the sampler 19 for test analysis;
the concentration control method of the injected fracturing fluid comprises the following steps: general purpose medicineMetering CO injection by means of an excess mass flow meter 4 2 And the amount of chemical reagent injected into the piston container 5;
(1) Static test: after the fracturing fluid is filled in the reaction kettle 22 and reacts with the rock sample 16 for a period of time, the mineral ion change conditions in the reaction fluids at different layers are selectively tested and analyzed by sampling from the upper, middle, lower and bottom of the reaction kettle 22;
(2) Dynamic test: after the fracturing fluid is filled in the reaction kettle 22 and reacts with the rock sample 16 for a period of time, one of the four valves 9, the five valve 10 and the six valve 11 is selected to be opened, and liquid oxygen is continuously input from one of the upper part, the middle part and the lower part of the reaction kettle 22; meanwhile, the change conditions of mineral ions in the reaction liquid at different layers are analyzed through sampling test from the upper, middle, lower and bottom of the reaction kettle 22, so that the change conditions of mineral ions in the reaction liquid at different layers are analyzed completely;
changing the experimental temperature, pressure and fracturing fluid concentration conditions, and carrying out the test under the next experimental condition; after the experimental test is finished, opening a valve ten 18 and a valve eleven 20, and discharging and recycling samples;
2) When the test fracturing fluid is a liquid fracturing fluid:
the liquid fracturing fluid is injected into the piston container 5 just before the experiment is started, i.e. the experiment test is started, only the CO injection is not needed 2 Gas, other methods are unchanged, relative test of CO 2 The method of the fracturing fluid is simpler.
Claims (3)
1. A multifunctional reaction kettle experiment system is characterized in that: the device comprises a piston container (5), a gas cylinder (1), a cooler (2), a valve I (3) and a mass flowmeter (4) which are sequentially connected to the top of the piston container (5), a constant-speed constant-pressure pump (6) is connected with the bottom of the piston container (5) through a valve II (7), the top of the piston container (5) is provided with a branch which is divided into three branches after passing through a valve III (8), the branches are respectively connected with the upper part, the middle part and the lower part of the left side of a reaction kettle (22) through a valve IV (9), a valve V (10) and a valve VI (11), and the upper part, the middle part, the lower part and the bottom of the right side of the reaction kettle (22) are respectively connected with a sampler (19) through a valve seven (12), a valve eight (13), a valve nine (14) and a valve V (18), and the bottom of the sampler (19) is connected with a valve IV (20);
the volume of the piston container (5) is 5-20 times larger than that of the reaction kettle (22), and multiple test operations are carried out in order to facilitate liquid preparation;
the reaction kettle (22) is arranged in the temperature control box (21), the stirrer (15) is arranged at the top of the reaction kettle (22), the tray (17) capable of supporting the rock sample (16) is arranged at the bottom of the reaction kettle, and the bottom of the tray (17) is of a grid structure so that the bottom of the rock sample (16) cannot be contacted with the fracturing fluid sample;
the two sides of the reaction kettle (22) are provided with a plurality of inflow branches at the upper part, the middle part and the lower part, and outflow branches at the upper part, the middle part, the lower part and the bottom part, and the reaction kettle is selectively opened according to experimental requirements;
the experimental method of the multifunctional reaction kettle experimental system,
1) When the test fracturing fluid is CO 2 When the fracturing fluid is anhydrous:
firstly, all valves are closed, a piston container (5) is opened, and chemical reagents required by the fracturing fluid are injected into the piston container; then, the valve I (3) is opened, and the CO in the gas cylinder (1) is discharged 2 The gas passes through the cooler (2), the valve one (3), the mass flowmeter (4) flows into the piston container (5), and the CO flowing into the piston container (5) is metered by the mass flowmeter (4) 2 The mass of the gas is combined with the mass of the chemical reagent injected into the piston container (5), the mass concentration of the chemical reagent in the fracturing fluid in the piston container (5) is calculated, and then the valve I (3) is closed;
opening valve II (7) and constant speed constant pressure pump (6) to drive CO in piston container (5) 2 Pressurizing the anhydrous fracturing fluid to a target experimental pressure condition;
opening the reaction kettle (22) to place the rock sample (16) on the tray (17) in the reaction kettle, and closing the reaction kettle (22); then adjusting the temperature control box (21) to a target experimental temperature;
then closing the valve II (7), opening the valve III (8), and opening one of the valve IV (9), the valve V (10) and the valve VI (11), filling the fracturing fluid into the reaction kettle (22), so as to ensure that the surface of the rock sample (16) can be contacted with the fracturing fluid; after preset time at each interval, one of a valve seven (12), a valve eight (13), a valve nine (14) and a valve ten (18) is selected to be opened according to the requirement, so that a liquid sample in the reaction kettle (22) flows into a sampler (19) for test analysis;
the concentration control method of the injected fracturing fluid comprises the following steps: metering CO injection by mass flowmeter (4) 2 And the amount of chemical reagent injected into the piston container (5);
(1) Static test: after the fracturing fluid is filled in the reaction kettle (22) and reacts with the rock sample (16) for a period of time, the mineral ion change conditions in the reaction fluids at different layers are selectively tested and analyzed from the upper, middle, lower and bottom of the reaction kettle (22);
(2) Dynamic test: after the fracturing fluid is filled in the reaction kettle (22), and reacts with the rock sample (16) for a period of time, one of the valve IV (9), the valve V (10) and the valve VI (11) is selected to be opened, and liquid oxygen is continuously input from one of the upper part, the middle part and the lower part of the reaction kettle (22); meanwhile, sampling, testing and analyzing the change conditions of mineral ions in the reaction liquid at different layers from the upper, middle, lower and bottom of the reaction kettle (22), so as to analyze the change conditions of mineral ions in the reaction liquid at different layers;
changing the experimental temperature, pressure and fracturing fluid concentration conditions, and carrying out the test under the next experimental condition; after the experimental test is finished, opening a valve ten (18) and a valve eleven (20), and discharging and recycling samples;
2) When the test fracturing fluid is a liquid fracturing fluid:
the liquid fracturing fluid is injected into the piston container (5) just before the experiment is started, namely the experiment test is started, only CO is not required to be injected 2 Gas, other methods are unchanged, relative test of CO 2 The method of the fracturing fluid is simpler.
2. The multifunctional reaction kettle experiment system according to claim 1, wherein: the top of the piston container (5) can be opened, so that the liquid sample can be conveniently injected; and the interaction experiment of the conventional hydraulic fracturing fluid and the carbon dioxide fracturing fluid under different temperature, pressure and concentration conditions is conveniently tested.
3. The multifunctional reaction kettle experiment system according to claim 1, wherein: the volume of the sampler (19) is smaller than that of the reaction kettle (22), so that liquid samples can be conveniently taken out at any time from different layers of the upper layer, the middle layer, the lower layer and the bottom layer for testing and analysis after reaction in the reaction kettle (22) in the experimental process.
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| CN110412221B (en) * | 2019-08-01 | 2022-02-22 | 中国石油大学(华东) | Foam gel preparation evaluation device for simulating reservoir in-situ state and use method |
| CN113903236B (en) * | 2021-10-22 | 2023-04-25 | 中铁二院工程集团有限责任公司 | Intelligent control Wen Yacha opposite-property water rock action contrast monitoring experimental device and experimental method thereof |
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