CN115163034A - CO without chemical agent assistance 2 Microbubble oil displacement and burial experiment system - Google Patents
CO without chemical agent assistance 2 Microbubble oil displacement and burial experiment system Download PDFInfo
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- CN115163034A CN115163034A CN202210673032.2A CN202210673032A CN115163034A CN 115163034 A CN115163034 A CN 115163034A CN 202210673032 A CN202210673032 A CN 202210673032A CN 115163034 A CN115163034 A CN 115163034A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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 DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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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- 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
Abstract
The invention provides CO without the assistance of a chemical agent 2 Microbubble flooding and sequestration experimental system, the experimental system comprises CO 2 Microbubble device, first displacement device, second displacement device, rock core holder and collection device, CO 2 The micro bubble device comprises a foaming box body, a porous filter disc and a stirring component, wherein the porous filter disc and the stirring component are arranged in the foaming box body, the lower end of the foaming box body is provided with an air inlet communicated with a plurality of filter holes of the porous filter disc, the foaming box body is provided with a liquid inlet on the side wall above the porous filter disc, the upper end of the foaming box body is provided with a bubble discharge port, and the first displacement device injects CO into the foaming box body from the air inlet 2 The second displacement device injects liquid into the foaming box body from the liquid inlet, the injection port of the rock core holder is in butt joint with the bubble discharge port, and the collecting device is used for produced water, produced oil and produced CO 2 Collecting compared with chemical agent-assisted CO 2 The mining cost of the foaming mode is obviously reduced, and the damage to the reservoir can be avoided, thereby achieving the purpose of protecting the environment.
Description
Technical Field
The invention belongs to the technical field of oil field gas drive exploitation, and particularly relates to CO without assistance of a chemical agent 2 Micro-bubble flooding and buryingAnd (4) an experimental system.
Background
As conventional oil field development fails, the goal of oil production is gradually focused on unconventional oil field development. The method realizes the efficient development of the unconventional oil field, and has important significance for meeting the domestic market demand and ensuring the national energy safety. At present, the gas injection development mode is commonly adopted to supplement stratum energy, sweep a residual oil area and improve the yield of crude oil, and the method is widely applied to low-permeability and compact oil reservoirs and oil reservoirs in a high water-cut period. Wherein, due to CO 2 The method has the characteristics of good injectivity, capability of expanding crude oil, reduction of crude oil viscosity, extraction of light components, easiness in phase mixing and the like, is the most advantageous gas injection oil displacement technology at present, and can realize great improvement of crude oil recovery rate. At the same time, by injecting CO into the formation 2 Oil displacement and CO realization 2 One of the most effective and economical means for sequestration is one of the key technologies for achieving the "1.5 ℃ temperature control target and the" 30.60 "carbon neutralization target.
At present, CO 2 The oil displacement technology is often subjected to the problems of easy gas channeling, low sweep efficiency, easy gravity differentiation and the like in the field practical application of the oil field, and the practical effect is seriously influenced. Thus, CO may be employed 2 Foam flooding technology and CO 2 The thickening technology aims at inhibiting gas channeling and improving sweep efficiency. However, conventional foam technology currently suffers from several problems: 1. various chemical agents are needed for assistance in foaming and foam stabilization, so that the exploitation cost is further increased; 2. various chemical agents are often subjected to property change under the condition of high temperature and high pressure of a stratum or are adsorbed and retained in the stratum in a large amount, so that reservoir damage and environmental problems can be caused; 3. the conventional foam is difficult to inject into a low-permeability and compact reservoir, and the effect is not ideal.
Disclosure of Invention
In response to the above-mentioned deficiencies or inadequacies of the prior art, the present invention provides a CO without the assistance of chemicals 2 An experimental system for micro-bubble flooding and sequestration, which aims to solve the problem of adopting chemical agent to assist CO 2 Foaming not only increases the production cost, but also easily causes reservoir damage and technical problems affecting the environment.
In order to achieve the above object, the present invention provides a CO without the aid of a chemical agent 2 Microbubble flooding and sequestration experimental system, wherein, CO without assistance of chemical agent 2 The microbubble flooding and sequestration experimental system comprises CO 2 The system comprises a micro-bubble device, a first displacement device, a second displacement device, a rock core holder and a collecting device; CO 2 2 The micro bubble device comprises a foaming box body, a porous filter disc and a stirring component, wherein the porous filter disc and the stirring component are arranged in the foaming box body; the first displacement device is butted with the air inlet and injects CO into the foaming box body 2 (ii) a The second displacement device is butted with the liquid inlet and injects liquid into the foaming box body; the injection port of the core holder is butted with the bubble discharge port; the collecting device is butted with the production outlet of the rock core holder and is used for respectively carrying out produced water, produced oil and produced CO 2 And (4) collecting.
In the embodiment of the invention, a stirring space, a filter disc space and an air vent space which are communicated are sequentially formed in a foaming box body from top to bottom, a stirring assembly extends into the stirring space, a step surface which extends out in the circumferential direction is formed on the filter disc space at the joint of the filter disc space and the air vent space and faces the stirring space, a porous filter disc is arranged on the step surface facing the air vent space, an air inlet is formed in the bottom wall of the foaming box body and is communicated with the air vent space, an air inlet is formed in the side wall which is arranged corresponding to the stirring space and is communicated with the stirring space, and an air bubble discharge port is formed in the top wall of the foaming box body and is communicated with the stirring space.
In the examples of the present invention, CO 2 The microbubble device also comprises a pressing ring body which is arranged on the porous filter disc and is connected with the inner wall of the filter disc space.
In the embodiment of the invention, the porous filter disc is a ceramic membrane part, and/or the aperture of the filter pores of the porous filter disc is 0.1-10 μm.
In the embodiment of the invention, the stirring assembly comprises a rotating motor, a stirring shaft and stirring blades, wherein the rotating motor is externally arranged on the top wall of the foaming box body, the stirring shaft is connected with the rotating motor through a bearing piece and extends into the stirring space, and the stirring blades are arranged on the free end of the stirring shaft.
In the embodiment of the invention, the foaming box body comprises a box body with an opening at the upper end and a sealing cover arranged on the box body in a covering manner, the box body is sequentially provided with a stirring space, a filter space and a ventilation space from top to bottom, the bottom wall of the box body is provided with an air inlet, the side wall of the box body corresponding to the stirring space is provided with a liquid inlet, the sealing cover is provided with a bubble outlet, the rotating motor is arranged at the outer side of the sealing cover, and the stirring shaft penetrates through the sealing cover and extends into the stirring space.
In an embodiment of the invention, the collecting device comprises a gas-liquid separation container communicated with the production outlet of the core holder and a first mass flow meter communicated with the gas-liquid separation container, the gas-liquid separation container is used for collecting produced water and produced oil, and the first mass flow meter is used for collecting produced CO 2 And for the production of CO 2 The mass of (b) is measured.
In the embodiment of the invention, the experimental system also comprises a device for measuring CO in the produced water 2 Potentiometric titrator for measuring concentration and CO in produced oil 2 And a chromatograph for measuring the concentration.
In an embodiment of the invention, the first displacement device comprises a first displacement pump, a CO and a first displacement pump which are connected in sequence 2 The outlet end of the second mass flowmeter is butted with the air inlet; the experimental system also comprises a pressure sensor for detecting the pressure difference between the injection opening and the production opening of the core holder.
In the embodiment of the invention, the second displacement device comprises a second displacement pump, and a water storage intermediate container and an oil storage intermediate container which are respectively connected with the second displacement pump, wherein the outlet end of the water storage intermediate container is in butt joint with the liquid inlet, and the oil storage intermediate container is in butt joint with the injection port of the core holder.
In an embodiment of the present invention, the experimental system further comprises a control device, the control device is in communication connection with the first displacement pump, the second displacement pump, the first mass flow meter, the second mass flow meter and the pressure sensor, respectively, the control device is configured to:
controlling a second displacement pump to displace the water storage intermediate container to perform saturated water operation;
acquiring the weight change of the experimental rock core and calculating the pore volume of the experimental rock core;
controlling a second displacement pump to displace the oil storage intermediate container to perform saturated oil operation;
acquiring the drainage volume and calculating the oil saturation of the experimental core according to the drainage volume and the pore volume;
controlling a first displacement pump to displace CO 2 Injecting CO into foaming box body by intermediate container 2 Controlling a second displacement pump to displace the water storage intermediate container to inject water into the foaming box body, and acquiring the mass data of the first mass flow meter and the second mass flow meter and the differential pressure data of the pressure sensor in real time;
acquiring the volume of the produced oil in the gas-liquid separation container, and calculating the recovery ratio according to the volume of the produced oil, the oil saturation and the pore volume;
obtaining CO of produced water and produced oil in gas-liquid separation container 2 Quality data and CO from produced water and produced oil 2 Calculating CO from the mass data and the mass data of the first mass flow meter and the second mass flow meter 2 And (4) burying rate.
Through the technical scheme, the CO without the assistance of the chemical agent is provided by the embodiment of the invention 2 The microbubble oil displacement and sequestration experimental system has the following beneficial effects:
when the above experimental system is used, since the experimental system includes CO 2 The micro-bubble device, the first displacement device, the second displacement device, the rock core holder and the collecting device are arranged on the core holder, and the first displacement device and the second displacement device can respectively supply power to the CO 2 CO is injected into the foaming box body of the micro-bubble device at a fixed flow rate 2 And a liquid for foaming, and CO 2 The stirring space where the stirring component is located can be reached after entering from the air inlet at the lower end of the foaming box body and being filtered by the porous filter disc, and the liquid inlet of liquid for foaming is arranged on the side wall above the porous filter disc, so that the liquid can directly enter the stirring space where the stirring component is locatedIn the middle, the stirring component above the porous filter disc can drive the foaming liquid to filter CO passing through the porous filter disc 2 Shearing the bubbles to produce CO 2 Micro bubbles, CO 2 The micro bubbles can enter the core holder from the bubble discharge port to carry out oil displacement experiment operation on the experiment core, and the collecting device butted with the production outlet of the core holder can finish the operations of producing water, producing oil and producing CO 2 Thereby realizing CO without the assistance of chemical agent 2 Foaming mode and can simulate CO 2 The oil displacement process of the micro bubbles can change the injected CO 2 And the gas-liquid ratio of the foaming liquid to evaluate CO 2 Oil displacement effect of microbubbles and CO 2 Sequestration rate of CO 2 The practical application effect of microbubbles provides a laboratory evaluation method compared to chemical-assisted CO 2 The mining cost of the foaming mode is obviously reduced, and the damage to the reservoir can be avoided, thereby achieving the purpose of protecting the environment.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide an understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic diagram of an experimental system according to an embodiment of the present invention;
FIG. 2 is a CO according to an embodiment of the present invention 2 A schematic structural diagram of a micro-bubble device;
FIG. 3 is a schematic view of a flooding experiment according to an embodiment of the present invention;
fig. 4 is a control flow diagram of the control device according to an embodiment of the invention.
Description of the reference numerals
1 CO 2 Micro bubble device 11 foaming box
111. Box body 112 sealing cover
113. Liquid inlet of air inlet 114
115. Bubble discharge port 116 agitation space
117. Filter space 118 plenum
12. Porous filter 13 stirring subassembly
131. Rotating motor 132 stirring shaft
133. Mixing blade 14 ring pressing body
2. First displacement device 21 first displacement pump
22 CO 2 Intermediate container 23 second mass flow meter
24. Valve 25 second backpressure valve
3. Second displacement device 31 second displacement pump
32. Water storage intermediate container 33 oil storage intermediate container
4. Core holder 41 confining pressure pump
42. Pressure sensor 5 collection device
51. Gas-liquid separation vessel 52 first mass flow meter
53. First back pressure valve 6 control device
Detailed Description
The following detailed description of specific embodiments of the invention refers to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative and explanatory of the invention and are not restrictive thereof.
The chemical-free CO of the present invention is described below with reference to the accompanying drawings 2 Microbubble flooding and burial experiment system.
In an embodiment of the present invention, as shown in FIGS. 1 and 2, a CO without the assistance of a chemical agent is provided 2 Microbubble flooding and sequestration experimental system, wherein, CO without chemical agent assistance 2 Microbubble displacement of reservoir oil and burial experiment system includes:
CO 2 the micro bubble device 1 comprises a foaming box body 11, a porous filter disc 12 and a stirring component 13, wherein the porous filter disc 12 and the stirring component 13 are arranged in the foaming box body 11, and the stirring component 13 is positionedAbove the porous filter 12, the lower end of the foaming box body 11 is provided with an air inlet 113 communicated with a plurality of filter holes of the porous filter 12, the side wall of the foaming box body 11 above the porous filter 12 is provided with a liquid inlet 114, and the upper end of the foaming box body 11 is provided with a bubble discharge outlet 115;
a first displacement device 2 which is butted with the air inlet 113 and injects CO into the foaming box body 11 2 ；
The second displacement device 3 is butted with the liquid inlet 114 and injects liquid into the foaming box body 11;
the injection port of the core holder 4 is in butt joint with the bubble discharge port 115;
a collecting device 5 which is butted with the production outlet of the rock core holder 4 and is used for respectively collecting produced water, produced oil and produced CO 2 And (4) collecting.
When the above experimental system is used, the experimental system includes CO 2 The micro bubble device 1, the first displacement device 2, the second displacement device 3, the core holder 4 and the collecting device 5, the first displacement device 2 and the second displacement device 3 can respectively supply the CO with the gas 2 CO is injected into the foaming tank 11 of the micro-bubble device 1 at a fixed flow rate 2 And a liquid for foaming, and CO 2 Enters from an air inlet 113 at the lower end of the foaming box body 11 and can reach a stirring space 116 where the stirring component 13 is located after being filtered by the porous filter disc 12, and a liquid inlet 114 of liquid for foaming is arranged on the side wall above the porous filter disc 12, so that the liquid for foaming can directly enter the stirring space 116 where the stirring component 13 is located, and therefore the stirring component 13 above the porous filter disc 12 can drive the liquid for foaming to filter CO passing through the porous filter disc 12 2 Shearing the bubbles to produce CO 2 Micro bubbles, CO 2 The micro bubbles can enter the core holder 4 from the bubble discharge port 115 to carry out oil displacement experiment operation on the experimental core, and the collecting device 5 butted with the production outlet of the core holder 4 can finish the operations of producing water, producing oil and producing CO 2 Thereby realizing CO without the assistance of chemical agent 2 Foaming mode and can simulate CO 2 The oil displacement process of the micro bubbles can change the injected CO 2 Hair harmonizing deviceGas-liquid ratio of bubbling liquid to evaluate CO 2 Oil displacement effect and CO of micro-bubbles 2 Sequestration rate of CO 2 The practical application effect of microbubbles provides a laboratory evaluation method, compared to chemical agent assisted CO 2 The mining cost of the foaming mode is obviously reduced, and the damage to a reservoir can be avoided, so that the aim of protecting the environment is fulfilled.
It should be noted in particular that the second displacement device 3 is directed towards CO 2 The foaming liquid injected into the foaming tank 11 of the micro bubble device 1 may be water or other suitable liquid.
Referring to fig. 2, in the embodiment of the present invention, the agitation space 116, the filter space 117, and the aeration space 118 are sequentially formed in the foaming tank 11 from top to bottom, the agitation assembly 13 extends into the agitation space 116, a step surface extending circumferentially is formed at a joint of the filter space 117 and the aeration space 118, the porous filter 12 is disposed on the step surface facing the aeration space 118, the air inlet 113 is disposed on a bottom wall of the foaming tank 11 and is communicated with the aeration space 118, the liquid inlet 114 is disposed on a side wall corresponding to the agitation space 116 and is communicated with the agitation space 116, and the bubble outlet 115 is disposed on a top wall of the foaming tank 11 and is communicated with the aeration space 116. That is, by sequentially forming the stirring space 116, the filter space 117 and the ventilation space 118 from top to bottom in the inner cavity of the foaming box 11, it is possible to facilitate layout design of the stirring assembly 13 and the porous filter 12 and butt joint with the first displacement device 2, the second displacement device 3 and the core holder 4, and at the same time, it is possible to facilitate fixed mounting of the porous filter 12 by forming a step surface in the filter space 117.
In the examples of the present invention, CO 2 The micro bubble device 1 further includes a pressing ring body 14 disposed on the porous filter 12 and connected to the inner wall of the filter space 117, so that the porous filter 12 can be pressed against the step surface by the pressing ring body 14 to ensure CO 2 Can pass through porous filter element 12 into agitation space 116 in which agitation assembly 13 is located. Specifically, the ring pressing body 14 may be a stainless steel member, an external thread is formed on an outer side of the ring pressing body 14, and an internal thread that is threadedly coupled with the ring pressing body 14 is formed on an inner wall of the filter space 117, so thatThe removable mounting of the pressure ring body 14 can be achieved.
In the embodiment of the present invention, the porous filter sheet 12 may be a ceramic membrane, and/or the pore diameter of the porous filter sheet 12 may be 0.1 μm to 10 μm. The material of the porous filter sheet 12 may be a sintered ceramic porous filter sheet 12, specifically, a porous ceramic membrane sintered by zirconia particles may be used, and the plurality of filter pores on the porous filter sheet 12 are uniformly distributed, and the average pore diameter thereof is preferably about 1 μm, and the prepared CO 2 The diameter range of the micro-bubbles is 5-100 μm, and micro-bubbles with different diameters can be prepared by replacing the porous filter discs 12 with different pore diameters in the experimental process. Materials that can be used for porous filter 12 are also: porous powder metal filters, natural rock filters or metal oxide filters.
In the embodiment of the present invention, the stirring assembly 13 includes a rotating motor 131, a stirring shaft 132 and a stirring blade 133, the rotating motor 131 is disposed on the top wall of the foaming chamber 11, the stirring shaft 132 is connected to the rotating motor 131 through a bearing member and extends into the stirring space 116, the stirring blade 133 is disposed on the free end of the stirring shaft 132, so that the rotating motor 131 can drive the stirring blade 133 to stir in the stirring space 116, so as to stir the CO entering the stirring space 116 2 The bubbles shear. Specifically, the number of the agitating blades 133 is at least two, and the at least two agitating blades 133 are arranged at uniform intervals in the circumferential direction on the free end of the agitating shaft 132. More specifically, the rotating motor 131 may be controlled to change the rotating speed of the stirring blade 133 during the experiment to prepare microbubbles of different diameters.
In the embodiment of the present invention, the foaming box 11 includes a box body 111 with an open upper end and a sealing cover 112 covering the box body 111, the box body 111 sequentially forms a stirring space 116, a filter space 117 and an air vent space 118 from top to bottom, the bottom wall of the box body 111 is provided with an air inlet 113, the side wall of the box body 111 corresponding to the stirring space 116 is provided with a liquid inlet 114, the sealing cover 112 is provided with a bubble discharge port 115, the rotating motor 131 is disposed outside the sealing cover 112, and the stirring shaft 132 penetrates through the sealing cover 112 and extends into the stirring space 116. That is, the foaming box 11 is a detachable structure so as to facilitate the disassembly and assembly of the stirring shaft 132 and the porous filter 12, and at the same time, the sealing cover 112 can be mounted on the box body 111 through a threaded connection member so as to ensure the sealing performance of the foaming box 11.
Referring again to fig. 1, in the embodiment of the present invention, the collecting device 5 includes a gas-liquid separation container 51 communicating with the production port of the core holder 4, the gas-liquid separation container 51 collecting produced water and produced oil, and a first mass flow meter 52 communicating with the gas-liquid separation container 51, the first mass flow meter 52 collecting produced CO 2 And for the production of CO 2 The mass of (b) is measured. Gas-liquid separation can be performed by the gas-liquid separation container 51, and produced water and produced oil can be retained in the gas-liquid separation container 51 to produce CO 2 The first mass flow meter 52 may be directed to produce CO 2 The mass of (b) is measured. Specifically, the gas-liquid separation container 51 is a gas-liquid separation graduated cylinder with a rubber plug, that is, two delivery pipes are inserted on the rubber plug, one delivery pipe is butted with the extraction outlet of the core holder 4, the other delivery pipe is butted with the first mass flow meter 52, and meanwhile, extracted water and extracted oil can be separated in the gas-liquid separation graduated cylinder, and an extracted water volume and an extracted oil volume can be obtained by reading the liquid levels of the extracted water and the extracted oil in the gas-liquid separation graduated cylinder, so that a water sample and an oil sample in the gas-liquid separation container 51 can be respectively extracted, and the water sample and the oil sample are sealed and stored. Further, the accuracy of the first mass flow meter 52 can be up to 0.5%.
Further, a first back pressure valve 53 is provided between the production port of the core holder 4 and the gas-liquid separation vessel 51, and the produced fluid from the core holder 4 passes through the first back pressure valve 53 and then enters the gas-liquid separation vessel 51.
In the embodiment of the invention, the experimental system also comprises a device for measuring CO in the produced water 2 Potentiometric titrator (not shown) for concentration determination and CO in produced oil 2 A chromatograph (not shown) for measuring the concentration of CO in the produced water and the produced oil, respectively 2 Concentration of CO in produced water and produced oil 2 The mass is calculated, and then the CO is accurately calculated 2 And (4) burying rate. In particular, the recovery and sequestration rates at different stages may be achieved at intervalsRecording the volume of water and oil in the gas-liquid separation vessel 51 and collecting produced water and produced oil and measuring CO 2 And (4) concentration.
In an embodiment of the invention, the first displacement device 2 comprises a first displacement pump 21, CO, connected in series 2 An intermediate container 22 and a second mass flow meter 23, the outlet end of the second mass flow meter 23 being in abutment with the gas inlet 113. I.e. the first displacement pump 21 may displace CO 2 CO in the intermediate vessel 22 2 Automatically injected into the foaming tank 11 and the second mass flow meter 23 can measure the injected CO 2 The mass is measured, the precision of the second mass flow meter 23 can reach 0.5%, and in order to ensure the accuracy of the measurement, the first mass flow meter 52 and the second mass flow meter 23 can adopt different ranges, the working range of the first mass flow meter 52 can be 0.1 MPa-0.5 MPa, and the working range of the second mass flow meter 23 can be 1 MPa-25 MPa. In particular, CO 2 A second back pressure valve 25 may be provided between the intermediate tank 22 and the second mass flow meter 23 to inject CO into the foaming tank 11 at a constant flow rate 2 Gas and foaming liquid, the gas compression being slower, the second back pressure valve 25 serving to prevent the foaming liquid from being poured into the CO during the injection 2 CO injected in the intermediate container 22 and under the action of the second backpressure valve 25 2 It is required to pass through the second back pressure valve 25 only when the back pressure is higher than the set back pressure, so that the gas flow rate can be more precisely controlled by the setting of the second back pressure valve 25. In addition, a valve 24 is provided between the second mass flow meter 23 and the air inlet 113 of the foaming chamber 11, so that whether to inject CO into the foaming chamber 11 can be controlled by the valve 24 2 。
In the embodiment of the present invention, the experimental system further includes a pressure sensor 42 for detecting a pressure difference between an injection port and a production port of the core holder 4, so that the pressure difference between the two ends of the injection port and the production port of the core holder 4 can be monitored by the pressure sensor 42.
In the embodiment of the invention, the core holder 4 is further connected with a confining pressure pump 41, and the pressure of the core holder 4 can be adjusted through the confining pressure pump 41 in the experimental process.
In the embodiment of the present invention, the second displacement device 3 includes a second displacement pump 31, and an intermediate water storage tank 32 and an intermediate oil storage tank 33 respectively connected to the second displacement pump 31, an outlet end of the intermediate water storage tank 32 is in butt joint with the liquid inlet 114, and the intermediate oil storage tank 33 is in butt joint with an inlet of the core holder 4. The water storage intermediate container 32 and the oil storage intermediate container 33 are arranged in parallel, when saturated water operation needs to be carried out on an experimental rock core in the rock core holder 4, the second displacement pump 31 can be controlled to displace the water storage intermediate container 32 to inject saturated water into the rock core holder 4, at the moment, water can flow through the foaming box body 11, the first displacement device 2 does not work, and the valve 24 between the second mass flow meter 23 and the foaming box body 11 is closed; when the experiment rock core in the rock core holder 4 needs to be subjected to saturated oil operation, the second displacement pump 31 can be controlled to displace the oil storage intermediate container 33 to directly inject saturated oil into the rock core holder 4; when CO production is required 2 During micro-bubble, the second displacement pump 31 can be controlled to displace the water storage intermediate container 32 to inject water into the foaming box body 11, and the water can be used as foaming liquid.
It should be noted that, before the experiment is performed by using the experimental system, the pressure sensor 42, the first mass flow meter 52 and the second mass flow meter 23 need to be calibrated to zero, and then the porous filter 12 for foaming is installed in the foaming box 11 to complete the CO calibration 2 Assembling the micro bubble device 1, performing leak detection, connecting the pipeline, and introducing CO 2 Water and oil into the respective intermediate containers, and depending on the experimental conditions, the valve 24 is closed and the CO is fed by the first displacement pump 21 2 The intermediate tank 22 is pressurized until a predetermined pressure is reached, and the first back pressure valve 53 and the second back pressure valve 25 are set, and the pressure of the second back pressure valve 25 is generally required to be 2MPa to 3MPa higher than the pressure of the first back pressure valve 53 depending on the permeability grade of the experimental core.
Referring to fig. 1 and 4, in the embodiment of the present invention, the experimental system further includes a control device 6, the control device 6 is in communication connection with the first displacement pump 21, the second displacement pump 31, the first mass flow meter 52, the second mass flow meter 23, and the pressure sensor 42, respectively, and the control device 6 is configured to:
and step 100, controlling the second displacement pump 31 to displace the water storage intermediate container 32 to perform saturated water operation.
Specifically, before the saturated water operation, the dry weight of the experimental core is recorded, and then the second displacement pump 31 is controlled by the control device 6 to displace the water storage intermediate container 32 to inject saturated water into the core holder 4, so as to perform the saturated water operation.
And 200, acquiring the weight change of the experimental core and calculating the pore volume of the experimental core.
Specifically, the wet weight of the experimental core is recorded after the saturated water operation is finished, the front and back weight change of the experimental core is obtained through calculation according to the dry weight and the wet weight of the experimental core, and then the pore volume of the experimental core can be obtained through calculation according to the weight change and the density of the saturated water. The calculation formula of the pore volume of the experimental core is as follows:
where PV is expressed as pore volume, m 'is expressed as wet weight of the experimental core, m' is expressed as dry weight of the experimental core, ρ Water (W) Expressed as saturated water density.
And step 300, controlling the second displacement pump 31 to displace the oil storage intermediate container 33 to perform saturated oil operation.
Specifically, after saturated water operation is performed, irreducible water saturation can be established for the experimental core, the second displacement pump 31 is controlled by the control device 6 to displace the oil storage intermediate container 33 to inject saturated oil into the core holder 4, and the displaced water displacement volume can be measured after 3 pore volumes of saturated oil are displaced.
And step 400, acquiring the water drainage volume and calculating the oil saturation of the experimental rock core according to the water drainage volume and the pore volume.
Further, the drainage water in the saturated oil operation process can flow into the gas-liquid separation container 51, so that the drainage volume can be obtained by reading the liquid level, and the oil saturation of the experimental core can be calculated according to the drainage volume and the pore volume. The calculation formula of the oil saturation of the experimental core is as follows:
wherein S is O Expressed as the oil saturation, V, of the experimental core Row board Expressed as the displaced volume and PV as the pore volume.
Step 500, controlling the first displacement pump 21 to displace CO 2 The intermediate container 22 injects CO into the foaming tank 11 2 And controlling the second displacement pump 31 to displace the water storage intermediate container 32 to inject water into the foaming tank 11, and acquiring the mass data of the first mass flow meter 52 and the second mass flow meter 23 and the differential pressure data of the pressure sensor 42 in real time.
Further, CO is carried out 2 Before the micro-foaming oil displacement operation, air in a pipeline needs to be discharged, the experimental rock core with the established irreducible water saturation degree is placed in the rock core holder 4, and confining pressure is loaded through the confining pressure pump 41. In CO 2 In the micro-foaming flooding operation experiment process, CO can be respectively injected into the foaming box body 11 through the first displacement pump 21 and the second displacement pump 31 at set flow rate and gas-liquid ratio 2 Gas and water, and passing CO 2 CO to be prepared by the micro-foaming device 2 The microbubble is injected into the core holder 4 to carry out oil displacement operation on the experimental core, and in the process of the oil displacement operation, the control device 6 can receive monitoring data acquired by the first mass flow meter 52, the second mass flow meter 23 and the pressure sensor 42 in real time and output the monitoring data as Excel data.
Step 600, the volume of the produced oil in the gas-liquid separation container 51 is obtained, and the recovery ratio is calculated according to the volume of the produced oil, the oil saturation and the pore volume.
Further, the produced water and the produced oil may be stratified in the gas-liquid separation container 51, the volume of the produced oil in the gas-liquid separation container 51 may be read, and the recovery ratio may be calculated from the volume of the produced oil, the oil saturation, and the pore volume. The formula for the recovery is:
wherein R is expressed as recovery factor, V Producing oil Expressed as produced oil volume, PV represents pore volume, S O Expressed as the oil saturation of the experimental core.
Step 700, obtaining CO of the produced water and the produced oil in the gas-liquid separation container 51 2 Quality data and CO from produced water and produced oil 2 Calculating CO from the mass data and the mass data of the first mass flow meter 52 and the second mass flow meter 23 2 And (4) burying rate.
Specifically, the produced water and the produced oil in the gas-liquid separation container 51 are separated and weighed respectively to obtain the quality of the produced water and the quality of the produced oil, and the produced water is subjected to potentiometric titration to obtain CO in the produced water 2 Concentration according to the quality of and CO in the produced water 2 The concentration can be calculated to obtain CO of the produced water 2 Quality data; the CO in the produced oil is obtained by chromatographic analysis of the produced oil 2 Concentration according to the quality of the produced oil and CO in the produced oil 2 The concentration can be calculated to obtain CO of the produced oil 2 And (4) quality data. CO in the produced water 2 The formula for the calculation of the mass data is:
wherein the content of the first and second substances,
expressed as CO in the produced water 2 The quality data of the raw material is measured,
expressed as CO in the produced water 2 Concentration, m Produced water Expressed as produced water quality.
CO in produced oil 2 The formula for calculating the mass data is:
wherein, the first and the second end of the pipe are connected with each other,
expressed as CO in the produced oil 2 The quality data of the sample to be tested,
expressed as CO in the produced oil 2 Concentration, m Producing oil Expressed as produced oil quality.
CO of the produced water and the produced oil obtained according to the calculation 2 The mass data and the mass data of the first mass flowmeter and the second mass flowmeter can be calculated to obtain CO 2 And (4) burying rate. CO 2 2 The buried rate is calculated by the formula:
wherein S is represented by CO 2 The buried rate of the carbon dioxide is increased,
represented as mass data of the second mass flow meter,
represented as mass data of the first mass flow meter,
expressed as CO in the produced water 2 The quality data of the sample to be tested,
expressed as CO in the produced oil 2 Quality data.
Referring to fig. 3, specifically, the experimental results obtained by using the experimental system to perform the oil displacement experiment on the experimental core with the permeability of 10mD, CO 2 The micro bubbles can be greatly driven by waterThe recovery efficiency is improved, and the final recovery efficiency improving amplitude can reach 38.2 percent. After long-term water flooding, the final CO 2 The burying rate can reach 82.3%, and the oil displacement effect and the sealing effect are good.
The invention has the advantages that: CO 2 2 The microbubble device combines the advantages of the porous medium method and the shearing method, and can control CO according to the requirement 2 The diameter of microbubble can adjust the gas-liquid ratio simultaneously, provides stable bubble source for the microbubble experiment. CO in oil, gas and water in the oil displacement-sequestration experimental process is realized by combining a mass flow meter with potentiometric titration and chromatographic analysis 2 Respectively measures, solves the problem that the prior art can only measure gas CO 2 CO in oil and water 2 The content can only be estimated by a formula, and the requirement of experimental accuracy is met. In the whole experiment process, the pressure difference and flow data can be monitored and collected in real time through integrated software integrated on the control device, the experiment can be operated in real time, various reaction parameters and parameter change curves can be accurately set and displayed in real time, the reaction process can be controlled or modified in an unlimited amount of records, and the recording accuracy is improved. Finally, an Excel data table of time, pressure difference and flow can be output, experimenters can calculate and obtain data of recovery ratio and burial rate through the data, and relevant curves are drawn. The whole set of experiment system is reasonable in design and simple and convenient to operate, more humanized designs are integrated while the accuracy of the experiment result is ensured, the labor intensity of experimenters can be reduced, and the overall safety of the experimenters is guaranteed.
In the description of the present invention, it is to be understood that the terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to imply that the number of technical features indicated are in fact significant. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. CO without assistance of chemical agent 2 Microbubble displacement of reservoir oil and burial experiment system, its characterized in that includes:
CO 2 microbubble device (1), including foaming box (11) and place in porous filter disc (12) and stirring subassembly (13) in foaming box (11), stirring subassembly (13) are located the top of porous filter disc (12), the lower extreme of foaming box (11) is seted up and is had instituteThe foaming device comprises an air inlet (113) communicated with a plurality of filter holes of the porous filter disc (12), a liquid inlet (114) is formed in the side wall of the foaming box body (11) above the porous filter disc (12), and a bubble discharge port (115) is formed in the upper end of the foaming box body (11);
a first displacement device (2) which is butted with the air inlet (113) and injects CO into the foaming box body (11) 2 ；
The second displacement device (3) is butted with the liquid inlet (114) and injects liquid into the foaming box body (11);
the injection port of the core holder (4) is butted with the bubble discharge port (115);
a collecting device (5) which is butted with the production outlet of the rock core holder (4) and is used for respectively carrying out produced water, produced oil and produced CO 2 And (4) collecting.
2. The CO of claim 1 without the aid of a chemical agent 2 Microbubble displacement of reservoir oil and burial experiment system, its characterized in that, foaming box (11) from top to bottom is formed with stirring space (116), filter disc space (117) and the space (118) of ventilating that the intercommunication set up in proper order, stirring subassembly (13) stretch into in stirring space (116), filter disc space (117) with the department of meeting of space (118) of ventilating towards stirring space (116) are formed with the step face that circumference was stretched out, porous filter disc (12) towards place in space (118) of ventilating on the step face, air inlet (113) are seted up in the diapire of foaming box (11) and with space (118) of ventilating intercommunication, inlet (114) set up with on the lateral wall that stirring space (116) correspond the setting and with stirring space (116) intercommunication, bubble discharge port (115) are seted up in the roof of foaming box (11) and with stirring space (116) intercommunication.
3. The CO of claim 2 without the aid of a chemical agent 2 Microbubble flooding and sequestration experimental system, characterized in that, CO 2 The microbubble device (1) further comprises a porous filter (12) disposed on the porous filter and connected to the inner wall of the filter space (117)And a ring pressing body (14).
4. The CO of claim 2 without the assistance of a chemical agent 2 The microbubble oil displacement and sequestration experimental system is characterized in that the porous filter disc (12) is a ceramic membrane part, and/or the pore diameter of the filter pores of the porous filter disc (12) is 0.1-10 microns.
5. The CO of claim 2 without the assistance of a chemical agent 2 Microbubble displacement of reservoir oil and burial experiment system, its characterized in that, stirring subassembly (13) include rotating electrical machines (131), (mixing) shaft (132) and stirring vane (133), rotating electrical machines (131) external placement in on the roof of foaming box (11), mixing shaft (132) pass through the bearing spare with rotating electrical machines (131) are connected and are stretched into in stirring space (116), stirring vane (133) set up on the free end of (mixing) shaft (132).
6. CO according to any one of claims 1 to 5 without the aid of chemical agents 2 Microbubble flooding and burial experiment system, characterized in that, collection device (5) include with gas-liquid separation container (51) of production outlet intercommunication of core holder (4) and with first mass flow meter (52) of gas-liquid separation container (51) intercommunication, gas-liquid separation container (51) are used for collecting produced water and produced oil, first mass flow meter (52) are used for collecting and produce CO 2 And for the production of CO 2 The mass of (b) is measured.
7. The CO of claim 6 without the assistance of a chemical agent 2 Microbubble flooding and sequestration experimental system, its characterized in that, the experimental system still includes CO to the production aquatic 2 Potentiometric titrator for measuring concentration and CO in produced oil 2 And a chromatograph for measuring the concentration.
8. The CO of claim 6 without the assistance of a chemical agent 2 Microbubble flooding and sequestration experimental system, characterized in that, firstThe displacement device (2) comprises a first displacement pump (21) and CO which are connected in sequence 2 An intermediate container (22) and a second mass flow meter (23), the outlet end of the second mass flow meter (23) being in abutment with the gas inlet (113); the experimental system also comprises a pressure sensor (42) for detecting the pressure difference between the injection port and the extraction port of the core holder (4).
9. The CO of claim 8 without the assistance of a chemical agent 2 Microbubble displacement of reservoir oil and burial deposit experiment system, its characterized in that, second displacement device (3) include second displacement pump (31) and respectively with container (32) and storage oil intermediate reservoir (33) in the middle of the water storage that second displacement pump (31) are connected, the exit end of container (32) in the middle of the water storage with inlet (114) butt joint, in the middle of the storage oil container (33) with the filling port butt joint of rock core holder (4).
10. The CO of claim 9 without the assistance of a chemical agent 2 Microbubble flooding and sequestration experimental system, characterized in that, the experimental system still includes controlling means (6), controlling means (6) respectively with first displacement pump (21), second displacement pump (31), first mass flow meter (52), second mass flow meter (23) and pressure sensor (42) communication connection, controlling means (6) are configured as:
controlling the second displacement pump (31) to displace the water storage intermediate container (32) for saturated water operation;
acquiring the weight change of the experimental rock core and calculating the pore volume of the experimental rock core;
controlling the second displacement pump (31) to displace the oil storage intermediate container (33) for saturated oil operation;
acquiring the drainage volume and calculating the oil saturation of the experimental rock core according to the drainage volume and the pore volume;
controlling the first displacement pump (21) to displace the CO 2 The intermediate container (22) injects CO into the foaming box body (11) 2 And controlling the second displacement pump (31) to displace the water storage intermediate container (32) toward the foaming tank body (b)11 Injecting water and acquiring the mass data of the first mass flowmeter (52) and the second mass flowmeter (23) and the pressure difference data of the pressure sensor (42) in real time;
obtaining a volume of produced oil in the gas-liquid separation container (51), and calculating a recovery factor from the volume of produced oil, the oil saturation, and the pore volume;
obtaining CO of produced water and produced oil in the gas-liquid separation container (51) 2 Quality data and CO from produced water and produced oil 2 Calculating CO from the mass data and the mass data of the first mass flow meter (52) and the second mass flow meter (23) 2 And (4) burying rate.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117823099A (en) * | 2024-03-05 | 2024-04-05 | 西南石油大学 | Carbon dioxide displacement of reservoir oil and sealing tool |
| CN117823099B (en) * | 2024-03-05 | 2024-05-10 | 西南石油大学 | Carbon dioxide displacement of reservoir oil and sealing tool |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117823099A (en) * | 2024-03-05 | 2024-04-05 | 西南石油大学 | Carbon dioxide displacement of reservoir oil and sealing tool |
| CN117823099B (en) * | 2024-03-05 | 2024-05-10 | 西南石油大学 | Carbon dioxide displacement of reservoir oil and sealing tool |
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