CN116241247B - Experimental device and method for simulating multi-well collaborative multi-cycle driving-swallowing coupling - Google Patents
Experimental device and method for simulating multi-well collaborative multi-cycle driving-swallowing coupling Download PDFInfo
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- 238000010168 coupling process Methods 0.000 title claims abstract description 110
- 230000008878 coupling Effects 0.000 title claims abstract description 108
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 108
- 238000000034 method Methods 0.000 title abstract description 15
- 238000002347 injection Methods 0.000 claims abstract description 25
- 239000007924 injection Substances 0.000 claims abstract description 25
- 230000001965 increasing effect Effects 0.000 claims abstract description 16
- 230000008859 change Effects 0.000 claims abstract description 15
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 64
- 238000004519 manufacturing process Methods 0.000 claims description 35
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 33
- 239000001569 carbon dioxide Substances 0.000 claims description 33
- 238000002360 preparation method Methods 0.000 claims description 33
- 239000003921 oil Substances 0.000 claims description 28
- 239000010779 crude oil Substances 0.000 claims description 22
- 238000002474 experimental method Methods 0.000 claims description 12
- 239000011435 rock Substances 0.000 claims description 10
- 238000000605 extraction Methods 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 229920006395 saturated elastomer Polymers 0.000 claims description 2
- 238000011084 recovery Methods 0.000 abstract description 10
- 230000008569 process Effects 0.000 abstract description 7
- 238000004458 analytical method Methods 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract description 2
- 230000015572 biosynthetic process Effects 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000006073 displacement reaction Methods 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 241000834151 Notesthes Species 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
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- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
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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
- 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
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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
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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
- E21B47/00—Survey of boreholes or wells
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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
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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Abstract
The invention relates to the technical field of unconventional oil and gas exploration and development, in particular to an experimental device and method for simulating multi-well collaborative multi-period driving-swallowing coupling. The invention develops the interwell interference analysis based on the theory of improving the recovery ratio, and overcomes the conventional CO 2 The throughput limits the utilization degree of the reservoir and the double-core driving-swallowing coupling device ignores the defect of inter-well interference, the influence of the inter-well interference is also considered, the multi-well collaborative multi-period driving-swallowing coupling oil increasing effect under the real reservoir condition is simulated, and the problem that the inter-well interference caused by the change of the adjacent well working system causes larger error on the multi-well collaborative driving-swallowing coupling experimental result in the gas injection process is solved by the existing experimental device.
Description
Technical Field
The invention relates to the technical field of unconventional oil and gas exploration and development, in particular to an experimental device and method for simulating multi-well collaborative multi-cycle driving-swallowing coupling.
Background
In 2021, the external dependence of crude oil in China is as high as 73%, and oil-gas resources are efficiently developed into a national energy strategy significant demand. The low-permeability dense oil reservoir in China is rich in reserve, and occupies more than 2/3 of the national petroleum reserve, so that the development potential is huge, and how to supplement stratum energy becomes the difficulty in developing the oil reservoir. The water drive can effectively supplement stratum deficit, but because injection pressure is too high, the reservoir is strong in water sensitivity, and crude oil is difficult to effectively displace. Particularly, with the increase of the low-permeability dense oil-gas resource ratio year by year in recent years, researchers find that an effective displacement pressure system is difficult to build by a water drive of an ultra-low-permeability oil reservoir, and related recovery efficiency improvement work is particularly important. A large number of indoor experimental researches show that the CO 2 Has the functions of expansion and energy increasing, extraction and viscosity reduction, and CO is implemented in mining sites 2 The huff and puff can effectively solve the problems of 'no injection, no production, low oil production speed and low recovery ratio' in the water flooding development process of the ultra-low permeability oil reservoir. However, conventional CO 2 The throughput mode is mainly synchronous throughput, the well groups lack of cooperation, the single well throughput has limited scope, and the reservoir utilization degree is low. Therefore, an experimental device and a method for simulating multi-well collaborative multi-cycle driving-swallowing coupling are provided. The well group realizes that the same well is not only an injection well but also an oil extraction well through alternate huff and puff, fully exerts the synergistic effect of injection-drive-braising-extraction, and further improves the reserve utilization degree between wells.
Deng Zhenlong et al (2022) designed double core CO 2 Drive-swallow coupling experiments, comparative analysis of different notesThe enhanced recovery efficiency under the production parameters, chen et al (2022) designed a supercritical carbon dioxide displacement experimental device which simulated three modes of continuous gas injection, synchronous gas injection and asynchronous gas injection, however they all ignored the influence of unstable pressure fields formed between wells during multi-well gas injection on the oil displacement. Kong et al (2016) have emphasized that inter-well interference can significantly affect adjacent well oil production when studying multi-well co-drive-swallow coupling techniques.
However, in the conventional multi-well collaborative driving-swallowing coupling experimental device, the gas injection experiment is carried out only for one well or even two wells in the stratum, so that the multi-well collaborative driving-swallowing coupling simulation is completed. When the influence of adjacent wells is discussed, larger errors caused by inter-well interference to the multi-well collaborative driving-swallowing coupling experimental result due to the change of the working system of the adjacent wells in the gas injection process are not considered, but the influence of the inter-well interference under the real stratum condition cannot be ignored, so that the recovery ratio is reduced.
Disclosure of Invention
The invention aims to provide an experimental device and method for simulating multi-well collaborative multi-cycle driving-swallowing coupling, and aims to solve the problem that the prior experimental device does not consider larger errors caused by inter-well interference to multi-well collaborative driving-swallowing coupling experimental results due to the change of an adjacent well working system in the gas injection process.
In order to achieve the above purpose, in a first aspect, the invention provides an experimental device for simulating multi-well collaborative multi-cycle driving-swallowing coupling, which comprises a high-pressure automatic pump, a first valve, a carbon dioxide sample preparation device, a stratum crude oil sample preparation device, a four-way valve, a vacuum pump, a constant temperature box, a first pressure gauge, a first coupling unit, a second pressure gauge, a second coupling unit, a third pressure gauge and a metering unit; the first valve is connected with the high-pressure automatic pump, the carbon dioxide sample preparation device is connected with the first valve and is connected with an a port of the four-way valve, the stratum crude oil sample preparation device is connected with the first valve and is connected with a b port of the four-way valve, the vacuum pump is connected with a d port of the four-way valve, the first pressure gauge is connected with a c port of the four-way valve, the first coupling unit is arranged on one side, far away from the four-way valve, of the first pressure gauge, the second pressure gauge is arranged on one side, far away from the first coupling unit, of the second pressure gauge, the third pressure gauge is arranged on one side, far away from the second pressure gauge, of the third pressure gauge, the carbon dioxide sample preparation device, the four-way valve, the first pressure gauge, the second pressure gauge and the first constant temperature sensor are arranged in the first pressure gauge.
The first coupling unit comprises a first core holder and a first confining pressure pump, wherein the first core holder is connected with the first pressure gauge and is positioned in the incubator, and the first confining pressure pump is connected with the first core holder and is positioned outside the incubator.
The second coupling unit comprises a second core holder, a third core holder, a second confining pressure pump and a third confining pressure pump, wherein the second core holder and the third core holder are connected in parallel and are both positioned in the constant temperature box, the second pressure gauge and the third pressure gauge are connected to the two sides of the second core holder and the third core holder in parallel, the second confining pressure pump is connected with the second core holder and is positioned outside the constant temperature box, and the third confining pressure pump is connected with the third core holder and is positioned outside the constant temperature box.
The metering unit comprises a second valve, a back pressure valve, a separator, a gas meter and a back pressure pump, wherein the second valve, the back pressure valve, the separator and the gas meter are sequentially connected and are all located outside the constant temperature box, the second valve is connected with the third pressure meter, and the back pressure pump is connected with the back pressure valve and is located on one side of the back pressure valve.
In a second aspect, the invention provides an experimental method for simulating multi-well collaborative multi-cycle drive-swallow coupling, comprising the following steps: s1, checking the tightness of an experimental device for simulating multi-well collaborative multi-cycle driving-swallowing coupling; s2, selecting a core A, a core B and a core C, cleaning and drying, and then respectively putting the selected core A, the core B and the core C into a first core holder, a second core holder and a third core holder, wherein an incubator simulates the stratum temperature to 106 ℃; d, c ports of the four-way valve are connected, the second valve is closed, and the core is vacuumized; then connecting ports b and c of the four-way valve, opening a second valve, pushing stratum crude oil in the stratum crude oil sample preparation device through a high-pressure automatic pump, and enabling the rock core to be saturated with the crude oil; s3, connecting an a port and a c port of the four-way valve, setting the pressure of the high-pressure automatic pump to be constant, pushing carbon dioxide in the carbon dioxide sample preparation device until the pressure of the first pressure gauge is the same as that of the high-pressure automatic pump, closing the c port of the four-way valve, and stewing the well for 12 hours to simulate the gas injection and stewing of the core A; s4, increasing the pressure of an inlet of the first core holder, closing a port c of the four-way valve, opening a second valve, reducing the pressure in stages, recording the number change of the second pressure gauge, measuring the oil production of the core A by using a separator, measuring the gas production of the core A by using a gas meter, and simulating the driving-swallowing coupling of the core A; s5, exchanging the positions of the first coupling unit and the second coupling unit; s6, connecting an a port and a c port of the four-way valve, setting the pressure of the high-pressure automatic pump to be constant, pushing carbon dioxide in the carbon dioxide sample preparation device until the pressure of the first pressure gauge is the same as that of the high-pressure automatic pump, closing the c port of the four-way valve, stewing the well for 12 hours, and simulating the core B, C gas injection and stewing the well; s7, increasing inlet pressures of a second core holder and a third core holder, closing a C port of a four-way valve, opening the second valve, reducing the pressure in stages, recording the change of the number of a second pressure gauge, measuring oil production of a core B and a core C by using a separator, measuring gas production of the core B and the core C by using a gas meter, and simulating driving-swallowing coupling of the core B, C; s8, repeating the steps S3-S7 to the preset times, and respectively calculating the extraction degree of the multi-period driving-swallowing coupling.
The experimental device for simulating multi-well collaborative multi-cycle driving-swallowing coupling performs experiments based on the improved recovery ratio theory, so that the inter-well interference analysis is performed on the basis of the conventional CO 2 Throughput limits on reservoir utilization and double-core drive-swallow coupling device ignores inter-well interferenceAnd simultaneously, the use of the asynchronous injection and production of the outer low-permeability reservoir of the joint between the same well joints is improved. According to the invention, the influence of inter-well interference is considered, the multi-well collaborative multi-period driving-swallowing coupling oil increasing effect under the real reservoir condition is simulated, and the obtained result is more reasonable and reliable. The core in the coupling unit is replaced, so that the core can be used for researching the influence of the heterogeneity of the core on the oil displacement effect. Besides performing drive-swallow coupling experiments, water drive, gas drive, chemical drive and CO considering inter-well interference can be performed 2 Buried experiments and the like, has wide application value, and solves the problem that the prior experimental device does not consider larger errors caused by the inter-well interference to the multi-well collaborative driving-swallowing coupling experimental result due to the change of the working system of adjacent wells in the gas injection process.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a first stage of an experimental apparatus for simulating multi-well collaborative multi-cycle driving-swallowing coupling according to the present invention.
Fig. 2 is a schematic structural diagram of a second stage of an experimental apparatus for simulating multi-well collaborative multi-cycle driving-swallowing coupling according to the present invention.
FIG. 3 is a flow chart of a process for simulating multi-well collaborative multi-cycle drive-swallow coupling.
Fig. 4 is a flow chart of an experimental method for simulating multi-well collaborative multi-cycle drive-swallow coupling provided by the invention.
1-high pressure automatic pump, 2-carbon dioxide sample preparation device, 3-stratum crude oil sample preparation device, 4-vacuum pump, 5-incubator, 6-first coupling unit, 7-second coupling unit, 8-first core holder, 9-second core holder, 10-third core holder, 11-first confining pressure pump, 12-second confining pressure pump, 13-third confining pressure pump, 14-back pressure pump, 15-back pressure valve, 16-separator, 17-gas gauge, 18-first pressure gauge, 19-second pressure gauge, 20-third pressure gauge, 21-four-way valve, 22-first valve, 23-second valve.
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.
Referring to fig. 1 to 2, in a first aspect, the present invention provides an experimental apparatus for simulating multi-well collaborative multi-cycle driving-swallowing coupling, which comprises a high-pressure automatic pump 1, a first valve 22, a carbon dioxide sample preparation device 2, a formation crude oil sample preparation device 3, a four-way valve 21, a vacuum pump 4, an incubator 5, a first pressure gauge 18, a first coupling unit 6, a second pressure gauge 19, a second coupling unit 7, a third pressure gauge 20 and a metering unit; the first valve 22 is connected with the high-pressure automatic pump 1, the carbon dioxide sample preparation device 2 is connected with the first valve 22 and is connected with an a port of the four-way valve 21, the stratum crude oil sample preparation device 3 is connected with the first valve 22 and is connected with a b port of the four-way valve 21, the vacuum pump 4 is connected with a d port of the four-way valve 21, the first pressure gauge 18 is connected with a c port of the four-way valve 21, the first coupling unit 6 is arranged on one side, far away from the four-way valve 21, of the first pressure gauge 18, the second pressure gauge 19 is arranged on one side, far away from the first pressure gauge 18, of the first coupling unit 6, the second coupling unit 7 is arranged on one side, far away from the first coupling unit 6, of the second coupling unit 7, far away from the second pressure gauge 19, the third pressure gauge 20 is arranged on one side, far away from the second coupling unit 7, the carbon dioxide metering unit is arranged on one side, far away from the third pressure gauge 20, far from the fourth coupling unit 7, the first pressure gauge 18, the first coupling unit 7, the first pressure gauge 3, the second coupling unit 7, the first pressure gauge 1, the fourth coupling unit 20, the first pressure gauge 1, the first coupling unit 3, the first pressure gauge 1, the second coupling unit 5, the stratum sample preparation device 20 and the first coupling unit 20.
Specifically, after selecting a core A, a core B and a core C, cleaning and drying, placing the core A into a first coupling unit 6, and placing the core B and the core C into a second coupling unit 7. And d and c ports of the four-way valve 21 are connected, the second valve 23 is closed, and the core is vacuumized. And then connecting ports b and c of the four-way valve 21, opening the second valve 23, and pushing the stratum crude oil in the stratum crude oil sample preparation device 3 by the high-pressure automatic pump 1 to saturate the core crude oil. The port a and the port c of the four-way valve 21 are connected, the pressure of the high-pressure automatic pump 1 is set to be constant, the carbon dioxide in the carbon dioxide sample preparation device 2 is pushed until the pressure of the first pressure gauge 18 is the same as that of the high-pressure automatic pump 1, the port c of the four-way valve 21 is closed, the well is closed for 12 hours, and the gas injection and the well closing of the core A are simulated. Increasing the pressure of the inlet of the first coupling unit 6, closing the port c of the four-way valve 21, opening the second valve 23, reducing the pressure in stages, recording the indication change of the second pressure gauge 19, metering the oil production of the core A by using the separator 16, metering the gas production of the core A by using the gas meter 17, and simulating the driving-swallowing coupling of the core A. The positions of the first coupling unit 6 and the second coupling unit 7 are reversed. The port a and the port c of the four-way valve 21 are connected, the pressure of the high-pressure automatic pump 1 is set to be constant, the carbon dioxide in the carbon dioxide sample preparation device 2 is pushed until the pressure of the first pressure gauge 18 is the same as that of the high-pressure automatic pump 1, the port c of the four-way valve 21 is closed, the well is closed for 12 hours, and the core B, C is simulated to be injected with gas for closing. Increasing the inlet pressure of the second coupling unit 7 and the third core holder 10, closing the C port of the four-way valve 21, opening the second valve 23, reducing the pressure in stages, recording the reading change of the second pressure gauge 19, metering the oil production of the core B and the core C by using the separator 16, metering the gas production of the core B and the core C by using the gas meter 17, and simulating the driving-swallowing coupling of the core B, C. Repeating the above operation to preset times, respectively calculating the extraction degree of multi-cycle driving-swallowing coupling, and carrying out interwell interference analysis based on the enhanced recovery theory, thereby overcoming the conventional CO 2 The throughput limits the utilization degree of the reservoir, and the double-core drive-swallow coupling device ignores the defect of interference among wells, and improves the utilization of the out-of-seam low-permeability reservoir of the same-well seam asynchronous injection and production. The invention considers the influence of the interference between wells and simulates the condition of a real reservoirThe multi-well cooperated multi-period driving-swallowing coupling oil increasing effect is more reasonable and reliable in obtained result. The core in the coupling unit is replaced, so that the core can be used for researching the influence of the heterogeneity of the core on the oil displacement effect. Besides performing drive-swallow coupling experiments, water drive, gas drive, chemical drive and CO considering inter-well interference can be performed 2 Buried experiments and the like, has wide application value, and solves the problem that the prior experimental device does not consider larger errors caused by the inter-well interference to the multi-well collaborative driving-swallowing coupling experimental result due to the change of the working system of adjacent wells in the gas injection process.
Further, the first coupling unit 6 includes a first core holder 8 and a first confining pressure pump 11, where the first core holder 8 is connected with the first pressure gauge 18 and is located in the incubator 5, and the first confining pressure pump 11 is connected with the first core holder 8 and is located outside the incubator 5. The second coupling unit 7 comprises a second core holder 9, a third core holder 10, a second confining pressure pump 12 and a third confining pressure pump 13, the second core holder 9 and the third core holder 10 are connected in parallel and are both positioned in the incubator 5, the second pressure gauge 19 and the third pressure gauge 20 are connected to two sides of the second core holder 9 and the third core holder 10 which are connected in parallel, the second confining pressure pump 12 is connected with the second core holder 9 and is positioned outside the incubator 5, and the third confining pressure pump 13 is connected with the third core holder 10 and is positioned outside the incubator 5. The metering unit comprises a second valve 23, a back pressure valve 15, a separator 16, a gas meter 17 and a back pressure pump 14, wherein the second valve 23, the back pressure valve 15, the separator 16 and the gas meter 17 are sequentially connected and are all positioned outside the constant temperature box 5, the second valve 23 is connected with the third pressure gauge 20, and the back pressure pump 14 is connected with the back pressure valve 15 and is positioned on one side of the back pressure valve 15.
Specifically, the first core holder 8, the second core holder 9 and the third core holder 10 are respectively used for fixing the core a, the core B and the core C, the first confining pressure pump 11, the second confining pressure pump 12 and the third confining pressure pump 13 are respectively used for controlling confining pressure of the first core holder 8, the second core holder 9 and the third core holder 10, the second valve 23 is used for realizing on-off between the first coupling unit 6 or the second coupling unit 7 and the separator 16, the back pressure valve 15 can avoid backflow of gas and oil, the separator 16 is used for measuring oil production, the gas gauge 17 is used for measuring gas production, and the back pressure pump 14 is used for controlling the back pressure of the back pressure valve.
Referring to fig. 1 to 4, in a second aspect, the present invention provides an experimental method for simulating multi-well collaborative multi-cycle driving-swallowing coupling, comprising the following steps: s1, checking the tightness of an experimental device simulating multi-well collaborative multi-cycle driving-swallowing coupling.
Specifically, the pressure of the device is kept to be 37MPa, and if the pressure change of the system is less than 0.5% within 12h, the device has good tightness, and experiments can be carried out. The device pressure for checking the tightness of the device in the step S1 is constant as the formation pressure.
S2, selecting a rock core A, a rock core B and a rock core C, cleaning and drying, and then respectively putting the selected rock cores A, B and C into a first rock core holder 8, a second rock core holder 9 and a third rock core holder 10, wherein the incubator 5 simulates the stratum temperature of 106 ℃. And d and c ports of the four-way valve 21 are connected, the second valve 23 is closed, and the core is vacuumized. And then connecting ports b and c of the four-way valve 21, opening the second valve 23, and pushing the stratum crude oil in the stratum crude oil sample preparation device 3 by the high-pressure automatic pump 1 to saturate the core crude oil.
Specifically, the experimental apparatus in step S2 simulates the original formation conditions of the formation temperature and the formation pressure.
S3 is connected with the port a and the port c of the four-way valve 21, the pressure of the high-pressure automatic pump 1 is set to be constant, the carbon dioxide in the carbon dioxide sample preparation device 2 is pushed until the pressure of the first pressure gauge 18 is the same as that of the high-pressure automatic pump 1, the port c of the four-way valve 21 is closed, the well is closed for 12 hours, and the gas injection and the well closing of the core A are simulated.
Specifically, the simulated core A is injected with gas to soak the well: the port a and the port c of the four-way valve 21 are connected, and the pump pressure P of the high-pressure automatic pump 1 is set 1 The volume V of carbon dioxide pumped into the carbon dioxide sample preparation device 2 is 37MPa 1 Up to the first pressure gauge 18 and the pump pressure P of the high-pressure automatic pump 1 1 And when the same is adopted, the port c of the four-way valve 21 is closed, and the well is closed for 12h. The simulated production process is shown in fig. 3 (a) and 3 (b).
S4, increasing the pressure of the inlet of the first core holder 8, closing the port c of the four-way valve 21, opening the second valve 23, reducing the pressure in stages, recording the indication change of the second pressure gauge 19, metering the oil production of the core A by using the separator 16, metering the gas production of the core A by using the gas meter 17, and simulating the driving-swallowing coupling of the core A.
Specifically, the core a drive-swallow coupling is simulated: increasing the inlet pressure P of the first core holder 8 1-1 To 37MPa, the c port of the four-way valve 21 is closed, the second valve 23 is opened, the pressure is reduced in stages, and the indication P of the second pressure gauge 19 is recorded 1-2 The separator 16 is used for measuring the oil production G of the core A h1 The gas production V of the core A is measured by a gas meter 17 g1 。
S5, the positions of the first coupling unit 6 and the second coupling unit 7 are exchanged.
Specifically, the reconnection device develops a simulated core B, C gas injection well logging-killing coupling process.
S6, connecting the port a and the port c of the four-way valve 21, setting the pressure of the high-pressure automatic pump 1 to be constant, pushing the carbon dioxide in the carbon dioxide sample preparation device 2 until the pressure of the first pressure gauge 18 is the same as that of the high-pressure automatic pump 1, closing the port c of the four-way valve 21, and flushing the well for 12 hours, and simulating the gas injection and flushing of the rock core B, C.
Specifically, simulated core B, C is injected with gas and is braised: the port a and the port c of the four-way valve 21 are connected, and the pressure P of the high-pressure automatic pump 1 is set 1 The volume V of carbon dioxide pumped into the carbon dioxide sample preparation device 2 is 37MPa 2 Up to the first pressure gauge 18 and the pump pressure P of the high-pressure automatic pump 1 1 And when the same is adopted, the port c of the four-way valve 21 is closed, and the well is closed for 12h. The simulated production process is shown in fig. 3 (c) and 3 (d).
S7, increasing inlet pressures of the second core holder 9 and the third core holder 10, closing a port C of the four-way valve 21, opening the second valve 23, reducing the pressure in stages, recording the reading change of the second pressure gauge 19, metering oil production of the core B and the core C by using the separator 16, metering gas production of the core B and the core C by using the gas meter 17, and simulating driving-swallowing coupling of the core B, C.
Specifically, simulated core B, C drives-swallows coupling: increasing the inlet pressure P of the second and third core holders 9, 10 1-1 To 37MPa, the c port of the four-way valve 21 is closed, the second valve 23 is opened, the pressure is reduced in stages, and the indication P of the second pressure gauge 19 is recorded 1-2 Varying, the separator 16 was used to meter the oil production G of core B and core C h2 The gas meters 17 are adopted to measure the gas production V of the core B and the core C g2 。
In the step S7, the first periodic oil-increasing amount calculation model:
G 1-1 ＝G h1 +G h2
wherein G is 1-1 The oil quantity is increased for the first period, and the unit is mL; g h1 Oil production of the core A is carried out in unit mL; g h2 Oil production per mL was measured for cores B and C.
First period CO 2 And (3) calculating a storage rate calculation model:
wherein ζ is the first period CO 2 Sealing rate; v (V) g1 The gas yield of the core A is unit mL; v (V) g2 The gas production of cores B and C is per mL; the volume of the carbon dioxide pumped for the first time is V 1 Unit mL; the volume of the carbon dioxide pumped in for the second time is V 2 Unit of mL.
S8, repeating the steps S3-S7 to the preset times, and respectively calculating the extraction degree of the multi-period driving-swallowing coupling.
Specifically, the pressure difference P between the injection and production steps S4 and S7 1-2 The recovery ratio of the driving-swallowing coupling stage is gradually increased. When the injection and production pressure difference is larger than the pressure difference between the formation pressure and the miscible pressure, the recovery ratio increase amplitude begins to be slow, and the recovery ratio change per unit pressure difference can appear as a peak value.
The above disclosure is merely illustrative of a preferred embodiment of an experimental apparatus and method for simulating multi-well collaborative multi-cycle driving-swallowing coupling according to the present invention, and it is needless to say that the scope of the invention is not limited thereto, and those skilled in the art can understand all or part of the procedures for implementing the above embodiments, and the equivalent changes made according to the claims of the present invention still fall within the scope of the invention.
Claims (5)
1. An experimental device for simulating multi-well collaborative multi-cycle driving-decoupling is characterized in that,
the system comprises a high-pressure automatic pump, a first valve, a carbon dioxide sample preparation device, a stratum crude oil sample preparation device, a four-way valve, a vacuum pump, a constant temperature box, a first pressure gauge, a first coupling unit, a second pressure gauge, a second coupling unit, a third pressure gauge and a metering unit;
the first valve is connected with the high-pressure automatic pump, the four-way valve is provided with an a port, a b port, a c port and a d port, the carbon dioxide sample preparation device is connected with the first valve and is connected with the a port of the four-way valve, the stratum crude oil sample preparation device is connected with the first valve and is connected with the b port of the four-way valve, the vacuum pump is connected with the d port of the four-way valve, the first pressure gauge is connected with the c port of the four-way valve, the first coupling unit is arranged on one side, far away from the four-way valve, of the first coupling unit, the second coupling unit is arranged on one side, far away from the first coupling unit, of the second coupling unit, the third crude oil sample preparation device is arranged on one side, far away from the second pressure gauge, of the third pressure gauge is arranged on one side, far away from the second coupling unit, of the carbon dioxide sample preparation device, the second pressure gauge, the first coupling unit, the first pressure gauge, the second coupling unit and the first stratum sample preparation device.
2. The experimental apparatus for simulating multi-well collaborative multi-cycle drive-swallow coupling according to claim 1, wherein,
the first coupling unit comprises a first core holder and a first pressure surrounding pump, the first core holder is connected with the first pressure gauge and is positioned in the incubator, and the first pressure surrounding pump is connected with the first core holder and is positioned outside the incubator.
3. The experimental apparatus for simulating multi-well collaborative multi-cycle drive-swallow coupling according to claim 2, wherein,
the second coupling unit comprises a second core holder, a third core holder, a second confining pressure pump and a third confining pressure pump, wherein the second core holder and the third core holder are connected in parallel and are both positioned in the constant temperature box, the second pressure gauge and the third pressure gauge are connected to the two sides of the second core holder and the two sides of the third core holder in parallel, the second confining pressure pump is connected with the second core holder and is positioned outside the constant temperature box, and the third confining pressure pump is connected with the third core holder and is positioned outside the constant temperature box.
4. The experimental apparatus for simulating multi-well collaborative multi-cycle drive-swallow coupling according to claim 3, wherein,
the metering unit comprises a second valve, a back pressure valve, a separator, a gas meter and a back pressure pump, wherein the second valve, the back pressure valve, the separator and the gas meter are sequentially connected and are all positioned outside the constant temperature box, the second valve is connected with the third pressure meter, and the back pressure pump is connected with the back pressure valve and is positioned on one side of the back pressure valve.
5. An experimental method for simulating multi-well collaborative multi-cycle driving-swallowing coupling, which is applied to the experimental device for simulating multi-well collaborative multi-cycle driving-swallowing coupling as claimed in claim 4, and is characterized by comprising the following steps:
s1, checking the tightness of an experimental device for simulating multi-well collaborative multi-cycle driving-swallowing coupling;
s2, selecting a core A, a core B and a core C, cleaning and drying, and then respectively putting the selected core A, the core B and the core C into a first core holder, a second core holder and a third core holder, wherein an incubator simulates the stratum temperature to 106 ℃; d, c ports of the four-way valve are connected, the second valve is closed, and the core is vacuumized; then connecting ports b and c of the four-way valve, opening a second valve, pushing stratum crude oil in the stratum crude oil sample preparation device through a high-pressure automatic pump, and enabling the rock core to be saturated with the crude oil;
s3, connecting an a port and a c port of the four-way valve, setting the pressure of the high-pressure automatic pump to be constant, pushing carbon dioxide in the carbon dioxide sample preparation device until the pressure of the first pressure gauge is the same as that of the high-pressure automatic pump, closing the c port of the four-way valve, and stewing the well for 12 hours to simulate the gas injection and stewing of the core A;
s4, increasing the pressure of an inlet of the first core holder, closing a port c of the four-way valve, opening a second valve, reducing the pressure in stages, recording the number change of the second pressure gauge, measuring the oil production of the core A by using a separator, measuring the gas production of the core A by using a gas meter, and simulating the driving-swallowing coupling of the core A;
s5, exchanging the positions of the first coupling unit and the second coupling unit;
s6, connecting an a port and a c port of the four-way valve, setting the pressure of the high-pressure automatic pump to be constant, pushing carbon dioxide in the carbon dioxide sample preparation device until the pressure of the first pressure gauge is the same as that of the high-pressure automatic pump, closing the c port of the four-way valve, stewing the well for 12 hours, and simulating the core B, C gas injection and stewing the well;
s7, increasing inlet pressures of a second core holder and a third core holder, closing a C port of a four-way valve, opening the second valve, reducing the pressure in stages, recording the change of the number of a second pressure gauge, measuring oil production of a core B and a core C by using a separator, measuring gas production of the core B and the core C by using a gas meter, and simulating driving-swallowing coupling of the core B, C;
s8, repeating the steps S3-S7 to the preset times, and respectively calculating the extraction degree of the multi-period driving-swallowing coupling.
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