CN116792093A - Foam composite flooding gas injection medium optimization and synchronous burial experiment device and method - Google Patents
Foam composite flooding gas injection medium optimization and synchronous burial experiment device and method Download PDFInfo
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- 238000002347 injection Methods 0.000 title claims abstract description 106
- 239000007924 injection Substances 0.000 title claims abstract description 106
- 239000002131 composite material Substances 0.000 title claims abstract description 96
- 239000006260 foam Substances 0.000 title claims abstract description 76
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 49
- 238000002474 experimental method Methods 0.000 title claims abstract description 28
- 238000009933 burial Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title abstract description 23
- 238000005457 optimization Methods 0.000 title abstract description 10
- 239000003921 oil Substances 0.000 claims abstract description 106
- 238000006073 displacement reaction Methods 0.000 claims abstract description 90
- 239000007788 liquid Substances 0.000 claims abstract description 67
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000011435 rock Substances 0.000 claims abstract description 22
- 239000010779 crude oil Substances 0.000 claims abstract description 20
- 239000007789 gas Substances 0.000 claims description 166
- 239000004215 Carbon black (E152) Substances 0.000 claims description 43
- 229930195733 hydrocarbon Natural products 0.000 claims description 39
- 150000002430 hydrocarbons Chemical class 0.000 claims description 39
- 239000004576 sand Substances 0.000 claims description 24
- 238000003860 storage Methods 0.000 claims description 23
- 238000005187 foaming Methods 0.000 claims description 21
- 150000001875 compounds Chemical class 0.000 claims description 18
- 239000004088 foaming agent Substances 0.000 claims description 17
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 16
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 15
- 239000000243 solution Substances 0.000 claims description 11
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 9
- 239000001569 carbon dioxide Substances 0.000 claims description 9
- 239000003027 oil sand Substances 0.000 claims description 9
- 238000000926 separation method Methods 0.000 claims description 9
- 229910052757 nitrogen Inorganic materials 0.000 claims description 8
- 238000009738 saturating Methods 0.000 claims description 5
- 230000000630 rising effect Effects 0.000 claims description 3
- 230000001965 increasing effect Effects 0.000 abstract description 18
- 230000015572 biosynthetic process Effects 0.000 abstract description 7
- 239000008398 formation water Substances 0.000 abstract description 7
- 229920006395 saturated elastomer Polymers 0.000 abstract description 6
- 238000011161 development Methods 0.000 abstract description 5
- 239000011148 porous material Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 230000005465 channeling Effects 0.000 description 6
- 239000005431 greenhouse gas Substances 0.000 description 5
- 238000011084 recovery Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000013329 compounding Methods 0.000 description 4
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- 238000004891 communication Methods 0.000 description 3
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- 238000004090 dissolution Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- 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
-
- 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
- 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
- E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
- E21B43/168—Injecting a gaseous medium
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B25/00—Models for purposes not provided for in G09B23/00, e.g. full-sized devices for demonstration purposes
- G09B25/02—Models for purposes not provided for in G09B23/00, e.g. full-sized devices for demonstration purposes of industrial processes; of machinery
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/70—Combining sequestration of CO2 and exploitation of hydrocarbons by injecting CO2 or carbonated water in oil wells
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- Fluid Mechanics (AREA)
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Abstract
The application relates to the technical field of unconventional oil and gas reservoir exploration and development, in particular to a foam composite flooding gas injection medium optimization and synchronous burial experiment device and method, wherein the foam composite flooding gas injection medium optimization and synchronous burial experiment method comprises the steps of establishing initial oil content and water saturation: a low-permeability rock core is selected to be placed in a rock core holder, a rock sample is vacuumized and saturated with formation water, the formation water is displaced by formation crude oil at a constant speed under the same temperature and pressure conditions, the confining pressure is simultaneously increased along with the continuous increase of injection pressure until only oil is discharged from the outlet end of the rock core holder and water is not discharged, initial oil content and water saturation of the rock core are established, a gas-liquid flowmeter is opened, a composite gas injection medium is displaced by the rock sample at a constant speed until the oil is not discharged from the outlet end of the rock core holder, oil displacement efficiency and gas-oil ratio are calculated respectively, and a foam composite flooding and synchronous burying experiment is carried out by the composite gas injection medium based on the experimental result of the composite gas flooding.
Description
Technical Field
The application relates to the technical field of unconventional oil and gas reservoir exploration and development, in particular to a foam composite flooding gas injection medium optimization and synchronous burial experiment device and method.
Background
The method has abundant hypotonic compact oil gas resources in China, but has low oil reservoir energy due to poor physical properties of reservoirs, and is difficult to establish reasonable injection and production relations, so that the water flooding development difficulty is increased. CO 2 Has better solubility in crude oil, can play roles of extracting expanded crude oil, reducing the viscosity of crude oil, reducing the interfacial tension of oil and water, and the like, and CO 2 The flooding has unique advantages in the aspect of low-permeability reservoir energy supplementing technology. However, due to the limitation of gas source and the influence of gas channeling, the requirement of improving the recovery ratio of gas injection of a horizontal well of a low-permeability oil reservoir is difficult to be met by a single gas drive. In an oil reservoir, foam can control the flow rate of injected gas, reduce the phenomenon of viscous fingering, expand the gas sweep range and realize the efficient use of residual oil in the reservoir. The foam composite flooding combines the dual advantages of gas flooding and chemical flooding, obviously reduces the gas-liquid phase relative permeability, obviously improves sweep efficiency, improves the gas flooding oil increasing effect, and simultaneously, on the one hand, the foam composite flooding technology can reduce CO 2 The injection quantity delays the corrosion of the oil pipe, on the other hand, the respective advantages of gas flooding and chemical flooding can be fully exerted, and the problems of early breakthrough and low sweep efficiency of gas in the single gas flooding process are effectively avoided. Because of the remote geographical position of Xinjiang oil field, large-scale implementation of CO 2 Because of low driving feasibility, research on energy supplementing modes of various injection gas composite foam driving needs to be carried out.
But adoptsIn the mode, under the influence of gas source limitation and gas channeling, the requirement of improving the recovery ratio of low permeability reservoir gas injection is difficult to be met by single gas drive, and foam composite drive (CO is adopted 2 -N 2 、CO 2 Hydrocarbon gas, N 2 Hydrocarbon gas) can effectively solve the problem of gas source and improve the gas drive oil increasing effect. However, the preferred systematic research on foam composite flooding gas injection media is less at present, and particularly, the comparison of the oil displacement effects of various gas injection composites and the synchronous burying of greenhouse gases in the foam composite flooding process are realized.
Disclosure of Invention
The application aims to provide a foam composite flooding gas injection medium optimization and synchronous burial experiment device and method, and aims to solve the problems that the prior foam composite flooding gas injection medium optimization has less systematic research, particularly the comparison of oil displacement effects of various gas injection composites, and the synchronous burial of greenhouse gases in the foam composite flooding process.
In order to achieve the above purpose, in a first aspect, the application provides a foam composite flooding gas injection medium preferably and synchronously burying experimental device, which comprises a first high-pressure displacement pump, a storage container, a plurality of gas-liquid flow meters, a four-way valve, a foaming solution injection member, a first pressure gauge, a foaming device, a core holder, a surrounding pressure pump, a back pressure valve, a back pressure pump, a second pressure gauge and a gas-liquid separation member, wherein the storage container is arranged at one side of a valve of the first high-pressure displacement pump; the plurality of gas-liquid flow meters are respectively arranged at one side of the storage container; the four-way valve is respectively communicated with the gas-liquid flow meters and is positioned at one side of the gas-liquid flow meters; the foaming solution injection piece is arranged at one side of the four-way valve; the first pressure gauge is communicated with the four-way valve and is positioned at one side of the four-way valve; the foamer is communicated with the four-way valve and is positioned at one side of the four-way valve; the core holder is communicated with the foamer and is positioned at one side of the foamer; the confining pressure pump is communicated with the core holder and is positioned at one side of the core holder; the back pressure valve is communicated with the core holder and is positioned at one side of the core holder; the back pressure pump is communicated with the back pressure valve and is positioned at one side of the back pressure valve; the second pressure gauge is communicated with the back pressure valve and is positioned at one side of the back pressure valve; the gas-liquid separation piece is arranged on one side of the back pressure valve.
The storage container comprises a stratum crude oil container, a stratum water container, a carbon dioxide container, a nitrogen container and a hydrocarbon gas container, wherein the stratum crude oil container is communicated with the first high-pressure displacement pump valve, is communicated with the gas-liquid flowmeter and is positioned at one side of the first high-pressure displacement pump; the stratum water container is communicated with the first high-pressure displacement pump valve, is communicated with the gas-liquid flowmeter and is positioned at one side of the first high-pressure displacement pump; the carbon dioxide container is communicated with the valve of the first high-pressure displacement pump, is communicated with the gas-liquid flow meter and is positioned at one side of the first high-pressure displacement pump; the nitrogen container is communicated with the first high-pressure displacement pump valve, is communicated with the gas-liquid flow meter and is positioned at one side of the first high-pressure displacement pump; the hydrocarbon gas container is communicated with the valve of the first high-pressure displacement pump, is communicated with the gas-liquid flow meter and is positioned on one side of the first high-pressure displacement pump.
The foaming solution injection piece comprises a foaming agent container and a second high-pressure displacement pump, wherein the foaming agent container is communicated with the four-way valve and is positioned at one side of the four-way valve; the second high-pressure displacement pump is communicated with the foaming agent container and is positioned at one side of the foaming agent container.
The foaming device comprises an inlet end, a sand filling pipe, natural oil sand, a porous filter disc, an outlet end and a valve, wherein the inlet end is communicated with the four-way valve and is positioned at one side of the four-way valve; the sand filling pipe is communicated with the inlet end and is positioned at one side of the inlet end; the natural oil sand is positioned in the sand filling pipe; the porous filter disc is fixedly connected with the sand filling pipe and is positioned at one side of the sand filling pipe; the outlet end is communicated with the sand filling pipe and is positioned at one side of the sand filling pipe, which is close to the porous filter disc; the valve is arranged at one side of the outlet end.
The gas-liquid separation piece comprises a gas-liquid separator and a gas chromatograph, and the gas-liquid separator is communicated with the back pressure valve and is positioned at one side of the back pressure valve; the gas chromatograph is fixedly connected with the gas-liquid separator and is positioned at one side of the gas-liquid separator.
The foam composite flooding gas injection medium is preferably used with the synchronous burying experimental device and further comprises a third pressure gauge, wherein the third pressure gauge is communicated with the core holder and is positioned on one side of the core holder.
In a second aspect, the application also provides a foam composite flooding gas injection medium optimized and synchronous burying experiment method, which is characterized by comprising the following steps of;
establishing an initial oil, water saturation: selecting a hypotonic core to be placed in a core holder, vacuumizing a rock sample and saturating stratum water, displacing the stratum water with stratum crude oil at a constant speed under the same temperature and pressure conditions, and simultaneously lifting confining pressure along with the continuous rising of injection pressure until only oil is discharged from the outlet end of the core holder and water is not discharged, so as to establish the initial oil content and water saturation of the core;
the composite gas-driven medium is preferably: opening the gas-liquid flow meter to inject the composite gas-injection medium (CO 2 -N 2 、CO 2 Hydrocarbon gas, N 2 -hydrocarbon gas) displacing the rock sample at a constant speed until no oil is produced at the outlet end of the core holder, respectively calculating the displacement efficiency and the gas-oil ratio;
foam compound flooding and synchronous embedding experiment: based on the composite gas-flooding experimental result, a foam composite flooding and synchronous burying experiment is preferably carried out by using a composite gas injection medium.
The foam composite flooding gas injection medium optimization and synchronous burial experimental device establishes initial oil and water saturation: selecting a hypotonic core to be placed in the core holder, vacuumizing the rock sample and saturating stratum water, displacing stratum water with stratum crude oil at a constant speed under the same temperature and pressure conditions, simultaneously increasing confining pressure along with the continuous increase of injection pressure until only oil is produced at the outlet end of the core holder and water is not discharged, establishing initial oil and water saturation of the core, opening the gas-liquid flowmeter, and injecting a composite gas-injection medium (CO 2 -N 2 、CO 2 Hydrocarbon gas, N 2 -hydrocarbon gas) at a constant rateAnd (3) displacing the rock sample at a speed until oil is not discharged from the outlet end of the core holder, respectively calculating oil displacement efficiency and gas-oil ratio, and carrying out foam composite flooding and synchronous burying experiments by preferably using a composite gas injection medium based on a composite gas flooding experimental result.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
FIG. 1 is a schematic diagram of the overall structure of a foam composite flooding gas injection medium and a synchronous burying experimental device.
Fig. 2 is a schematic structural diagram of a foamer of a foam composite flooding gas injection medium preferably and synchronous burying experimental device.
FIG. 3 is a flow chart of a foam composite flooding gas injection medium optimization and synchronous burial experiment method.
Fig. 4 is a graph of displacement efficiency for a composite gas drive medium optimization experiment of a foam composite gas drive gas injection medium optimization and synchronous burial experimental method.
Fig. 5 is a graph of gas-oil ratio of a preferred composite gas-drive medium experiment of a preferred foam composite gas-drive medium and a simultaneous buried experiment method.
FIG. 6 is a graph of displacement efficiency versus gas-oil ratio for a foam composite displacement and synchronous burial experiment of a foam composite displacement and gas injection medium preferred and synchronous burial experimental method.
1-first high-pressure displacement pump, 2-stratum crude oil container, 3-stratum water container, 4-carbon dioxide container, 5-nitrogen container, 6-hydrocarbon gas container, 7-gas-liquid flowmeter, 8-storage container, 9-foaming solution injection piece, 10-gas-liquid separation piece, 12-second high-pressure displacement pump, 13-foaming agent container, 14-four-way valve, 15-foaming device, 16-core holder, 17-surrounding pump, 18-back pressure valve, 19-back pressure pump, 20-gas-liquid separator, 21-gas chromatograph, 22-first pressure gauge, 23-third pressure gauge, 24-second pressure gauge, 30-sand filling pipe, 31-natural oil sand, 32-porous filter, 33-inlet end, 34-outlet end and 35-valve.
Detailed Description
In a first aspect, the application provides a foam composite flooding gas injection medium optimal and synchronous burial experimental device, which comprises:
referring to fig. 1-2, fig. 1 is a schematic diagram of an overall structure of a foam composite flooding gas injection medium and a synchronous burying experimental device, and fig. 2 is a schematic diagram of a foamer of the foam composite flooding gas injection medium and the synchronous burying experimental device.
The foam composite flooding gas injection medium and synchronous burying experimental device comprises a first high-pressure displacement pump 1, a storage container device 8, a plurality of gas-liquid flow meters 7, a four-way valve 14, a foaming solution injection piece 9, a first pressure gauge 22, a foamer 15, a core holder 16, a confining pressure pump 17, a back pressure valve 18, a back pressure pump 19, a second pressure gauge 24, a gas-liquid separation piece 10 and a third pressure gauge 23, wherein the storage container device 8 comprises a stratum crude oil container 2, a stratum water container 3, a carbon dioxide container 4, a nitrogen container 5 and a hydrocarbon container 6, the foaming solution injection piece 9 comprises a foamer container 13 and a second high-pressure displacement pump 12, the foamer 15 comprises an inlet end 33, a sand filling pipe 30, a natural oil sand 31, a porous 32, an outlet end 34 and a valve 35, and the gas-liquid separation piece 10 comprises a gas-liquid separator 20 and a gas chromatograph 21.
Wherein the storage container device 8 is arranged at one side of the valve of the first high-pressure displacement pump 1; a plurality of the gas-liquid flow meters 7 are respectively arranged on one side of the storage container 8; the four-way valve 14 is respectively communicated with the plurality of gas-liquid flow meters 7 and is positioned at one side of the plurality of gas-liquid flow meters 7; the foaming solution injector 9 is arranged at one side of the four-way valve 14; the first pressure gauge 22 is communicated with the four-way valve 14 and is positioned at one side of the four-way valve 14; the foamer 15 is communicated with the four-way valve 14 and is positioned at one side of the four-way valve 14; the core holder 16 is communicated with the foamer 15 and is positioned at one side of the foamer 15; the confining pressure pump 17 is communicated with the core holder 16 and is positioned at one side of the core holder 16; the saidA back pressure valve 18 is in communication with the core holder 16 and is located on one side of the core holder 16; the back pressure pump 19 is communicated with the back pressure valve 18 and is positioned at one side of the back pressure valve 18; the second pressure gauge 24 is communicated with the back pressure valve 18 and is positioned at one side of the back pressure valve 18; the gas-liquid separator 10 is disposed on one side of the back pressure valve 18 to establish an initial oil and water saturation: selecting a hypotonic core to be placed in the core holder 16, vacuumizing the rock sample and saturating the formation water, displacing the formation water with the formation crude oil at a constant speed under the same temperature and pressure conditions, increasing the confining pressure along with the continuous increase of the injection pressure until only the oil is discharged from the outlet end 34 of the core holder 16, establishing the initial oil content and water saturation of the core, opening the gas-liquid flowmeter 7, and injecting a composite gas-injection medium (CO 2 -N 2 、CO 2 Hydrocarbon gas, N 2 Hydrocarbon gas) at a constant rate until the outlet end 34 of the core holder 16 is not discharging oil, respectively calculating the displacement efficiency and the gas-oil ratio, and performing a foam composite displacement and synchronous burial experiment based on the composite gas displacement experimental result, preferably a composite gas injection medium.
Secondly, the stratum crude oil container 2 is communicated with the valve 35 of the first high-pressure displacement pump 1, is communicated with the gas-liquid flowmeter 7 and is positioned on one side of the first high-pressure displacement pump 1; the formation water container 3 is communicated with the valve 35 of the first high-pressure displacement pump 1, is communicated with the gas-liquid flowmeter 7 and is positioned on one side of the first high-pressure displacement pump 1; the carbon dioxide container 4 is communicated with the valve 35 of the first high-pressure displacement pump 1, is communicated with the gas-liquid flow meter 7 and is positioned on one side of the first high-pressure displacement pump 1; the nitrogen container 5 is communicated with the valve 35 of the first high-pressure displacement pump 1, is communicated with the gas-liquid flowmeter 7 and is positioned on one side of the first high-pressure displacement pump 1; the hydrocarbon gas container 6 is communicated with the valve 35 of the first high-pressure displacement pump 1, is communicated with the gas-liquid flowmeter 7, and is positioned on one side of the first high-pressure displacement pump 1, and the stratum crude oil container 2, the stratum water container 3, the carbon dioxide container 4, the nitrogen container 5 and the hydrocarbon gas container 6 are respectively used for storing various stock solutions to be sprayed at high pressure through the first high-pressure displacement pump 1, and each container is respectively provided with one gas-liquid flowmeter 7 for displaying high-pressure spraying flow data.
Again, the foaming agent container 13 is communicated with the four-way valve 14 and is positioned at one side of the four-way valve 14; the second high-pressure displacement pump 12 is communicated with the foaming agent container 13 and is positioned on one side of the foaming agent container 13, and the foaming agent container 13 is used for storing foaming solvent and conveying the foaming solvent into the foaming device 15 through the second high-pressure displacement pump 12.
In addition, the inlet end 33 is communicated with the four-way valve 14 and is positioned on one side of the four-way valve 14; the sand filling pipe 30 is communicated with the inlet end 33 and is positioned on one side of the inlet end 33; the natural oil sand 31 is positioned inside the sand filling pipe 30; the porous filter sheet 32 is fixedly connected with the sand filling pipe 30 and is positioned at one side of the sand filling pipe 30; the outlet end 34 is communicated with the sand filling pipe 30 and is positioned on one side of the sand filling pipe 30 close to the porous filter disc 32; the valve 35 is arranged on one side of the outlet end 34, the sand filling pipe 30 is filled with the natural oil sand 31, the length is 30cm, the diameter is 5cm, the porosity is 18.4%, and the permeability is 1mD. The porous filter sheet 32 is a ceramic membrane member and is placed at the outlet end 34 of the sand filling pipe 30 for filtering the natural oil sand 31, and the pore diameter of the filter pores is 0.1um-20um for controlling the size of the injected foam.
Furthermore, the gas-liquid separator 20 is in communication with the back pressure valve 18 and is located on one side of the back pressure valve 18; the gas chromatograph 21 is fixedly connected with the gas-liquid separator 20 and is located at one side of the gas-liquid separator 20, the monitoring gas-liquid separator 20 is used for producing fluid, and the gas chromatograph 21 is used for monitoring the gas-oil ratio of the fluid produced by the gas-liquid separator 20.
Finally, the third pressure gauge 23 is in communication with the core holder 16 and located on one side of the core holder 16, and is used for observing the pressure condition of the rock inside the core holder 16.
In the experimental device for preferably and synchronously burying the foam composite flooding gas injection medium, which is disclosed by the application, the foam composite flooding gas injection medium is influenced by gas source limitation and gas channeling, and the foam composite flooding gas injection medium is singleGas flooding is difficult to meet the requirement of low permeability reservoir fracturing horizontal well gas injection energy supplementing for improving recovery ratio, and the compound flooding technology is characterized in that different gas injection media are used for compounding, gas flooding and chemical flooding (CO) 2 Foam flooding and the like), can effectively solve the air source problem, improve the single medium oil increasing effect, further define the foam compound flooding oil increasing mechanism, based on two evaluation standards of oil displacement efficiency and gas-oil ratio, compare the oil increasing effect of single gas flooding and compound gas flooding, air injection medium is preferred and is used for developing foam compound flooding and synchronous burying experiments, the oil increasing effect of different injection gas displacement processes is systematically evaluated through changing the compound air injection medium, the change rule of foam compound flooding stable oil channeling prevention is revealed, the change of the gas storage rate of foam compound flooding synchronous burying is defined, the important guiding significance is provided for the development of foam compound flooding energy supplementing of low-permeability reservoir-greenhouse gas burying research, besides the development of foam compound flooding air injection medium is preferred and synchronous burying experiments, the air injection proportion of compound gas can be optimized, in addition, the influence rule of foam size on oil displacement effect and the like can be studied through changing the porous filter discs 32 with different apertures, and the foam compound flooding oil injecting device has wide application value.
In a second aspect, the present application further provides a method for testing a foam composite flooding gas injection medium preferably and a synchronous burying method, referring to fig. 3 to 6, where fig. 3 is a flowchart of the foam composite flooding gas injection medium preferably and the synchronous burying method, fig. 4 is a graph of oil displacement efficiency of the foam composite flooding gas injection medium preferably and the synchronous burying method, fig. 5 is a graph of gas-oil ratio of the foam composite flooding gas injection medium preferably and the synchronous burying method, and fig. 6 is a graph of oil displacement efficiency and gas-oil ratio of the foam composite flooding gas injection medium preferably and the synchronous burying method.
The foam composite flooding gas injection medium preferably and synchronous burial experimental method comprises the following steps:
s1 establishes initial oil, water saturation: selecting a hypotonic core to be placed in the core holder 16, vacuumizing a rock sample and saturating stratum water, displacing the stratum water with stratum crude oil at a constant speed under the same temperature and pressure conditions, and simultaneously increasing confining pressure along with the continuous increase of injection pressure until only oil is discharged from the outlet end 34 of the core holder 16 and water is not discharged, so as to establish initial oil content and water saturation of the core;
establishing an initial oil, water saturation: selecting a standard core (diameter is 2.5cm, length is 5-8 cm) of a target oil reservoir, arranging the standard cores in sequence, adding filter paper in the middle of the core, and eliminating end effect. The aligned cores are loaded into a packing element and the core holder 16 is assembled. The rock sample is vacuumized and fully saturated with formation water, the formation water is displaced by the formation crude oil at a constant speed under the conditions of reservoir temperature and pressure (formation pressure 25MPa, formation temperature 75 ℃), and the confining pressure is simultaneously raised along with the continuous increase of injection pressure until the outlet end 34 of the core holder 16 only produces oil and does not produce water, and the initial oil content and water saturation of the core are established. Recording the now raw oil pumped volume V using said gas-liquid flowmeter 7 1 The gas-liquid separator 20 is used to record the volume V of formation crude oil flowing out at this time 2 Calculating the saturated oil volume V of the core o The following are provided:
V o ＝V 1 -V 2
wherein V is o Saturated oil volume of the core, ml; v (V) 1 The raw oil pumping volume is ml, and the raw oil pumping volume is read through the gas-liquid flowmeter 7; v (V) 2 The crude oil outflow volume, ml, was measured by the gas-liquid separator 20.
Table 1 target reservoir core pore penetration parameters
The S2 composite gas-driven medium is preferably: opening the gas-liquid flow meter 7 to inject a composite gas-injection medium (CO 2 -N 2 、CO 2 Hydrocarbon gas, N 2 Hydrocarbon gas) displacing the rock sample at a constant velocity until the outlet end 34 of the core holder 16 is not discharging oil, calculating displacement efficiency and gas-oil ratio, respectively;
composite gas driveThe medium is preferably: the gas-liquid flow meter 7 was opened and a composite gas injection medium (CO was used 2 -N 2 、CO 2 Hydrocarbon gas, N 2 Hydrocarbon gas) displaces the rock sample at a constant velocity until the outlet end 34 of the core holder 16 is not discharging oil, the displacement efficiency and gas-oil ratio are calculated, respectively. The gas injection ratio of the composite gas injection medium is 1:1; the displacement speed of the composite gas injection medium is 0.1ml/min; the injection amount of the composite gas injection medium is injected according to the pore volume multiple (0-1.2 PV).
The oil displacement efficiency ED is calculated as follows:
in the formula, ED is oil displacement efficiency,%; vop is volume of produced oil, ml; vo is the volume of saturated oil, ml.
The Gas-Oil Ratio GOR (Gas-Oil-Ratio) is calculated as follows:
wherein GOR is the gas-oil ratio, m3/m3; v (V) 4 For the volume of produced gas, ml; v (V) op To extract oil volume, ml.
Three composite gas injection media (CO) were calculated separately 2 -N 2 、CO 2 Hydrocarbon gas, N 2 Hydrocarbon gas) under different pore volume multiple injection conditions, the oil displacement efficiency and the gas-oil ratio of the target reservoir core can be seen (fig. 3 and 4). Displacement results indicate that the CO 2 The hydrocarbon gas compound oil displacement efficiency is obviously higher than that of CO 2 -N 2 Compounding and N 2 Hydrocarbon gas compounding, final oil displacement efficiency up to 44.32% as compared with CO 2 -N 2 The recovery ratio is improved by 15.82 percent compared with N 2 Hydrocarbon gas complex flooding increases recovery by 23.26%. CO 2 Hydrocarbon gas complex, CO 2 -N 2 Compounding and N 2 The gas-oil ratio of the hydrocarbon gas composite is obviously increased when the displacement is carried out to 0.4PV, which indicates that the core is minedThe gas production and output at the outlet end are increased, and gas channeling is started to occur in core displacement. When the displacement is carried out to 1PV, the gas-oil ratio is gradually and stably increased, which indicates that the produced fluid at the core production end is basically injected gas, namely a gas channeling channel is generated in the core. Based on the analysis of the experimental results, finally obtaining CO 2 The hydrocarbon gas is recombined into the optimal composite gas injection medium.
S3, foam compound flooding and synchronous embedding experiments: based on the composite gas flooding experimental result, preferably carrying out foam composite flooding and synchronous burying experiments by using a composite gas injection medium;
foam compound flooding and synchronous embedding experiment: based on the S2 composite gas flooding experimental result, CO is preferred 2 Hydrocarbon gas composite gas expanding foam composite flooding and synchronous burying experiments.
Step one, injecting a foaming agent into the foaming device 15 at a constant speed, stopping injection and closing the port of the four-way valve 14a when the injection volume of the foaming agent exceeds 3/4 of the volume of the foaming device 15; the foam injection rate was 0.05ml/min.
Step two, CO is processed at a constant speed 2 Continuously pumping the hydrocarbon gas composite gas into the foaming device 15 filled with the foaming agent according to a set gas injection proportion, so that the foaming agent is fully dissolved and foamed; the gas injection ratio is 1:1.
Step three, opening the valve 35 of the outlet end 34 of the foamer 15, and correspondingly lifting the confining pressure of the core holder 16 along with the rising of the injection pressure until the outlet end 34 of the core holder 16 does not discharge oil, and respectively calculating oil displacement efficiency, gas-oil ratio and gas storage rate;
the oil displacement efficiency ED is calculated as follows:
in the formula, ED is oil displacement efficiency,%; v (V) op For the volume of oil produced, ml; v (V) o Saturated oil volume, ml.
The Gas-Oil Ratio GOR (Gas-Oil-Ratio) is calculated as follows:
wherein GOR is the gas-oil ratio, m3/m3; v (V) 4 For the volume of produced gas, ml; v (V) op To extract oil volume, ml.
Aiming at the condition that the Gas injection medium contains carbon dioxide or methane (greenhouse Gas), the Gas Storage rate GSR (Gas-Storage-Ratio) is defined as the Ratio of the residual Gas remained in the pores of the rock core to the injection Gas in the Gas injection process, and the Gas Storage rate is utilized to initially represent the greenhouse Gas Storage quantity in the rock core displacement process. The calculation formula of the gas storage rate GSR is as follows:
wherein GSR is the gas storage rate,%; v (V) 3 For the volume of injected gas, ml; v (V) 4 To yield gas volume, ml.
Computing an optimal composite gas injection Medium (CO) 2 Hydrocarbon gas) under different pore volume multiple injection conditions, the oil displacement efficiency and the gas-oil ratio of the target reservoir core can be seen (fig. 5). Experimental results show that CO 2 The hydrocarbon gas compound gas displacement effect is better than that of CO at the beginning 2 The hydrocarbon foam composite flooding effect may be due to CO at the early stage of gas flooding 2 The hydrocarbon gas fully plays roles of energy increasing expansion and dissolution viscosity reduction, so that the liquid production capacity in the initial stage of injection is high. CO 2 The hydrocarbon foam composite flooding adopts an injection mode of gas-liquid simultaneous injection, and CO starts to be exerted in the middle-later stage of injection 2 The hydrocarbon gas is used for displacement and oil increasing, and the advantages of 'large blockage is not small blockage is not caused, water blockage is not caused, oil blockage is not caused', the gas-oil ratio is obviously increased when the displacement is carried out to 0.6PV, the gas is completely broken through, and the oil displacement efficiency is increased slowly. The gas storage rate is 72% after the foam compound flooding is finished by using a gas storage rate calculation formula, and the analysis reasons are probably CO 2 Hydrocarbon gases dissolved in the residual oil to form a dissolution deposit or to form a formation deposit in the pore throat of the rock, on the other hand also possibly dissolved in the foam for plugging the coreLarge pores of (a) and the like.
Finally find out CO 2 The hydrocarbon foam composite flooding overall oil displacement effect is better than that of CO 2 The hydrocarbon gas composite gas drive oil displacement efficiency is improved by 7.46 percent. CO 2 The hydrocarbon foam composite flooding organically combines chemical flooding and gas flooding technologies, and fully exerts CO 2 The advantages of synergistic interaction of hydrocarbon gas displacement and chemical displacement not only improves CO 2 The utilization rate avoids the problem of air source limitation, effectively delays the crossflow of the gas injection reservoir, and realizes the integration of oil displacement and storage.
The foregoing disclosure is only illustrative of one or more preferred embodiments of the present application, and it is not intended to limit the scope of the claims hereof, as persons of ordinary skill in the art will understand that all or part of the processes for practicing the embodiments described herein may be practiced with equivalent variations in the claims, which are within the scope of the application.
Claims (7)
1. The foam composite flooding gas injection medium optimal selection and synchronous burial experimental device is characterized by comprising a first high-pressure displacement pump, a storage container, a plurality of gas-liquid flow meters, a four-way valve, a foaming solution injection piece, a first pressure gauge, a foaming device, a core holder, a surrounding pressure pump, a back pressure valve, a back pressure pump, a second pressure gauge and a gas-liquid separation piece, wherein the storage container is arranged at one side of a valve of the first high-pressure displacement pump; the plurality of gas-liquid flow meters are respectively arranged at one side of the storage container; the four-way valve is respectively communicated with the gas-liquid flow meters and is positioned at one side of the gas-liquid flow meters; the foaming solution injection piece is arranged at one side of the four-way valve; the first pressure gauge is communicated with the four-way valve and is positioned at one side of the four-way valve; the foamer is communicated with the four-way valve and is positioned at one side of the four-way valve; the core holder is communicated with the foamer and is positioned at one side of the foamer; the confining pressure pump is communicated with the core holder and is positioned at one side of the core holder; the back pressure valve is communicated with the core holder and is positioned at one side of the core holder; the back pressure pump is communicated with the back pressure valve and is positioned at one side of the back pressure valve; the second pressure gauge is communicated with the back pressure valve and is positioned at one side of the back pressure valve; the gas-liquid separation piece is arranged on one side of the back pressure valve.
2. The foam composite flooding gas injection medium optimized and synchronous burial experimental device according to claim 1, which is characterized in that,
the storage container part comprises a stratum crude oil container, a stratum water container, a carbon dioxide container, a nitrogen container and a hydrocarbon gas container, wherein the stratum crude oil container is communicated with the first high-pressure displacement pump valve, is communicated with the gas-liquid flowmeter and is positioned at one side of the first high-pressure displacement pump; the stratum water container is communicated with the first high-pressure displacement pump valve, is communicated with the gas-liquid flowmeter and is positioned at one side of the first high-pressure displacement pump; the carbon dioxide container is communicated with the valve of the first high-pressure displacement pump, is communicated with the gas-liquid flow meter and is positioned at one side of the first high-pressure displacement pump; the nitrogen container is communicated with the first high-pressure displacement pump valve, is communicated with the gas-liquid flow meter and is positioned at one side of the first high-pressure displacement pump; the hydrocarbon gas container is communicated with the valve of the first high-pressure displacement pump, is communicated with the gas-liquid flow meter and is positioned on one side of the first high-pressure displacement pump.
3. A foam composite flooding gas injection medium optimized and synchronous burial experimental device as set forth in claim 2, wherein,
the foaming solution injection piece comprises a foaming agent container and a second high-pressure displacement pump, and the foaming agent container is communicated with the four-way valve and is positioned at one side of the four-way valve; the second high-pressure displacement pump is communicated with the foaming agent container and is positioned at one side of the foaming agent container.
4. A foam composite flooding gas injection medium preferably and synchronous burial experimental device according to claim 3, wherein,
the foaming device comprises an inlet end, a sand filling pipe, natural oil sand, a porous filter disc, an outlet end and a valve, wherein the inlet end is communicated with the four-way valve and is positioned at one side of the four-way valve; the sand filling pipe is communicated with the inlet end and is positioned at one side of the inlet end; the natural oil sand is positioned in the sand filling pipe; the porous filter disc is fixedly connected with the sand filling pipe and is positioned at one side of the sand filling pipe; the outlet end is communicated with the sand filling pipe and is positioned at one side of the sand filling pipe, which is close to the porous filter disc; the valve is arranged at one side of the outlet end.
5. A foam composite flooding gas injection medium optimized and synchronous burial experimental device according to claim 4, characterized in that,
the gas-liquid separation piece comprises a gas-liquid separator and a gas chromatograph, and the gas-liquid separator is communicated with the back pressure valve and is positioned at one side of the back pressure valve; the gas chromatograph is fixedly connected with the gas-liquid separator and is positioned at one side of the gas-liquid separator.
6. The foam composite flooding gas injection medium optimized and synchronous burial experimental device according to claim 5, which is characterized in that,
the foam composite flooding gas injection medium is preferably and synchronously buried in the experimental device, and further comprises a third pressure gauge which is communicated with the core holder and is positioned on one side of the core holder.
7. A foam composite flooding gas injection medium preferably and synchronous burying experimental method, which is applied to the foam composite flooding gas injection medium preferably and synchronous burying experimental device according to any one of claims 1-6, and is characterized by comprising the following steps:
establishing an initial oil, water saturation: selecting a hypotonic core to be placed in a core holder, vacuumizing a rock sample and saturating stratum water, displacing the stratum water with stratum crude oil at a constant speed under the same temperature and pressure conditions, and simultaneously lifting confining pressure along with the continuous rising of injection pressure until only oil is discharged from the outlet end of the core holder and water is not discharged, so as to establish the initial oil content and water saturation of the core;
the composite gas-driven medium is preferably: opening the gas-liquid flow meter to inject the composite gas-injection medium (CO 2 -N 2 、CO 2 Hydrocarbon gas, N 2 -hydrocarbon gas) displacing the rock sample at a constant speed until no oil is produced at the outlet end of the core holder, respectively calculating the displacement efficiency and the gas-oil ratio;
foam compound flooding and synchronous embedding experiment: based on the composite gas-flooding experimental result, a foam composite flooding and synchronous burying experiment is preferably carried out by using a composite gas injection medium.
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