CN110578500A - Device and method for measuring carbon dioxide migration rule in carbon dioxide flooding and sequestration - Google Patents
Device and method for measuring carbon dioxide migration rule in carbon dioxide flooding and sequestration Download PDFInfo
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- CN110578500A CN110578500A CN201910882280.6A CN201910882280A CN110578500A CN 110578500 A CN110578500 A CN 110578500A CN 201910882280 A CN201910882280 A CN 201910882280A CN 110578500 A CN110578500 A CN 110578500A
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 454
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 227
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 226
- 238000013508 migration Methods 0.000 title claims abstract description 75
- 230000005012 migration Effects 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims abstract description 52
- 230000009919 sequestration Effects 0.000 title claims abstract description 27
- 238000004519 manufacturing process Methods 0.000 claims abstract description 76
- 238000002347 injection Methods 0.000 claims abstract description 69
- 239000007924 injection Substances 0.000 claims abstract description 69
- 239000010779 crude oil Substances 0.000 claims abstract description 66
- 239000003921 oil Substances 0.000 claims abstract description 36
- 238000009792 diffusion process Methods 0.000 claims abstract description 16
- 238000012545 processing Methods 0.000 claims abstract description 12
- 238000005516 engineering process Methods 0.000 claims abstract description 7
- 230000000903 blocking effect Effects 0.000 claims abstract description 4
- 238000007599 discharging Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 43
- 239000002689 soil Substances 0.000 claims description 35
- 239000008398 formation water Substances 0.000 claims description 31
- 239000004094 surface-active agent Substances 0.000 claims description 29
- 229920006395 saturated elastomer Polymers 0.000 claims description 21
- 238000010586 diagram Methods 0.000 claims description 18
- 230000015572 biosynthetic process Effects 0.000 claims description 15
- 230000008859 change Effects 0.000 claims description 15
- 238000011084 recovery Methods 0.000 claims description 15
- 238000007789 sealing Methods 0.000 claims description 15
- 239000004576 sand Substances 0.000 claims description 13
- 239000000243 solution Substances 0.000 claims description 13
- 238000000926 separation method Methods 0.000 claims description 8
- 230000035699 permeability Effects 0.000 claims description 6
- 238000000605 extraction Methods 0.000 claims description 5
- 239000006260 foam Substances 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 3
- 238000003672 processing method Methods 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 2
- 238000011161 development Methods 0.000 abstract description 4
- 238000004088 simulation Methods 0.000 description 29
- 230000008569 process Effects 0.000 description 27
- 238000006073 displacement reaction Methods 0.000 description 15
- 238000005755 formation reaction Methods 0.000 description 13
- 239000003245 coal Substances 0.000 description 10
- 239000012071 phase Substances 0.000 description 10
- 239000000126 substance Substances 0.000 description 9
- 238000002474 experimental method Methods 0.000 description 7
- 238000012544 monitoring process Methods 0.000 description 6
- 239000003208 petroleum Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 239000002775 capsule Substances 0.000 description 4
- 238000005065 mining Methods 0.000 description 3
- 239000003086 colorant Substances 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- 239000003673 groundwater Substances 0.000 description 2
- 238000012806 monitoring device Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 239000002901 radioactive waste Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
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
- 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/10—Locating fluid leaks, intrusions or movements
-
- 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
- G09B25/04—Models for purposes not provided for in G09B23/00, e.g. full-sized devices for demonstration purposes of buildings
-
- 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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- Life Sciences & Earth Sciences (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
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Abstract
the invention relates to the technical field of oil and gas field development and carbon dioxide sequestration, in particular to a device and a method for measuring the migration rule of carbon dioxide in carbon dioxide flooding and sequestration, wherein the device comprises an injection system, a sealed cavity clamping system and an information acquisition system, the sealed cavity clamping system internally simulates the stratum condition, and an injection well and a production well which are communicated with the bottom of the stratum are arranged above the sealed cavity clamping system; the injection system is connected with the sealed cavity clamping system and injects a certain amount of carbon dioxide, and the production well is used for discharging crude oil to the outside; the information acquisition system comprises a gas detector and an information data processing computer, the gas detector is in signal connection with the information data processing computer, the migration rule of the carbon dioxide can be simulated and obtained, the carbon dioxide is blocked in real time when the diffusion range of the carbon dioxide reaches a leakage threshold value, the blocking technology is judged, and the method has important significance for preventing the carbon dioxide from being leaked and sealed in actual production.
Description
Technical Field
The invention belongs to the technical field of oil and gas field development and carbon dioxide sequestration, and mainly relates to a device and a method for measuring a carbon dioxide migration rule in carbon dioxide flooding and sequestration.
Background
Carbon dioxide flooding has become an important development tool for tertiary oil recovery. The widespread use of carbon dioxide in petroleum is mainly due to several advantages. Firstly, the carbon dioxide can effectively supplement stratum energy, and the problems of difficult water injection, high water content rising speed and the like of the low-permeability reservoir are solved. And the carbon dioxide has high solubility in the crude oil, so that the viscosity of the crude oil can be effectively reduced, and the flow property of the crude oil is improved. Finally, the carbon dioxide can be mixed with the crude oil under certain pressure, so that the reservoir condition is improved, and the recovery degree of the crude oil is greatly improved.
Carbon dioxide capture and sequestration are one of the main measures for reducing the emission of carbon dioxide into the atmosphere and relieving global warming. Since carbon dioxide may leak through pores in the cap rock, faults or fractures in the geological formation, abandoned wells or drilled wells, etc., carbon dioxide stored in deep formations migrates upward under high pressure and buoyancy to invade shallow groundwater, thereby affecting shallow groundwater quality. Therefore, the carbon dioxide flooding and sequestration technology gradually becomes a non-negligible technical challenge in the petroleum industry.
the prior art CN109881021 discloses a method for simulating a gas injection and migration rule of a fracture-cavity type oil reservoir, which comprises the following steps: the method comprises the following steps: preparing a first substance and a second substance which are both in liquid state at normal temperature and normal pressure, wherein the density difference between the first substance and the second substance is the same as the density difference between crude oil and gas, the density of the crude oil is the density of the crude oil under the fracture-cavity oil reservoir environment, and the density of the gas is the density of injected gas under the fracture-cavity oil reservoir environment; step two: preparing a simulation model at normal temperature and normal pressure, wherein the simulation model is a crack model or a crack-karst cave model; step three: the simulation method comprises the steps of simulating crude oil by using a first substance and simulating gas by using a second substance at normal temperature and normal pressure, filling the first substance into a simulation model, injecting the second substance into the simulation model, and simulating the migration rule of gas injected from the fracture-cavity oil reservoir according to the migration rule of the second substance.
The prior art CN104292956 relates to a fully mechanized caving/mining longwall working face goaf flow field simulation experiment device and method, which are suitable for simulating to obtain test data, and comprise an experiment box body filled with a simulation coal bed, a goaf flow field test system is arranged below the simulation coal bed goaf, when the simulation coal bed goaf is used, the goaf flow field test system is started, so that the coal bed collapse process of the coal bed goaf is simulated, the coal bed is ignited by the goaf flow field test system, and the flow field information after the coal bed is combusted is collected, the simulation result has guiding significance for understanding the fire state and the gas migration rule of the goaf and controlling the natural and gas disasters of the goaf, the experiment device and the method of the gas migration rule related to the patent are only suitable for mine mining, the gas migration rule in the coal bed goaf, the simulation device of gas production in the coal mining process, and the key point, there is no insufflation process. And the stratum difference of the coal bed reservoir and the petroleum reservoir is very large, petroleum can flow in the stratum for exploitation, the correlation of the porosity, permeability and the like in different reservoirs on the flow of the petroleum reservoir and carbon dioxide is very large, and the method is also inapplicable in the displacement process of the oil field.
a simulation monitoring device for carbon dioxide leakage in soil related to CN 207516362 in the prior art includes a sealed housing, soil with a predetermined depth is contained in the sealed housing, and a plurality of temperature monitoring assemblies for monitoring the temperature of the soil are respectively arranged at different depths of the soil; the leakage simulation assembly is arranged in the soil and used for storing carbon dioxide, and when the internal pressure reaches a preset value, the carbon dioxide rushes out of the leakage simulation assembly and enters the soil; and the data acquisition component is in signal connection with the temperature monitoring component and is used for receiving the data sent by the temperature monitoring component. The invention provides a simulation monitoring device which can summarize rules according to simulation experiments so as to quickly search for carbon dioxide leakage points in soil, which only explains the monitoring of carbon dioxide leakage in soil, and focuses on the monitoring after carbon dioxide burial and the migration path of carbon dioxide in soil. However, the stratum is complex, not only is homogeneous soil, but also different layer series, different well patterns and oil displacement environments need to be considered. The method is characterized in that the migration rule of carbon dioxide is observed in the carbon dioxide displacement process, and the migration rule comprises the simulation processes of carbon dioxide migration and leakage in the displacement process of an oil field, carbon dioxide migration and leakage among wells, migration and leakage after carbon dioxide and miscible phase, and migration and leakage of carbon dioxide among different layers; the method can observe the leakage point of the reservoir in the carbon dioxide flooding process and the migration path of the carbon dioxide after the carbon dioxide comes out of the leakage point. The leakage simulation assembly of the carbon dioxide of the device cannot be arranged in soil in the prior art, the migration and leakage of the carbon dioxide in the oil field displacement process, the migration and leakage of the carbon dioxide between wells, the migration and leakage of the carbon dioxide and the mixed phase, and the migration and leakage simulation process of the carbon dioxide between different layers cannot be realized.
Disclosure of Invention
The invention aims to provide a device and a method for measuring carbon dioxide migration rules in carbon dioxide oil displacement and sequestration, which can simulate the oil displacement process, geological conditions, simulation of the migration and leakage of carbon dioxide among wells, carbon dioxide and miscible phases after the occurrence of the carbon dioxide and the miscible phases in an oil field displacement process, observe the migration rules and the diffusion range of the carbon dioxide through data acquisition and processing, perform real-time plugging when the diffusion range of the carbon dioxide reaches a leakage threshold value, judge the plugging technology and have important significance for preventing the carbon dioxide leakage and sequestration in actual production.
In order to achieve the purpose, the invention provides the following technical scheme: a device for measuring the migration rule of carbon dioxide in carbon dioxide flooding and sequestration comprises an injection system, a sealed cavity clamping system and an information acquisition system, wherein the sealed cavity clamping system is filled with sand, crude oil and formation water to simulate the formation conditions, and an injection well and a production well which are communicated with the bottom of the formation are arranged above the sealed cavity clamping system; the injection system is connected with the sealed cavity holding system and injects a certain amount of carbon dioxide through the injection well, and the production well is used for discharging crude oil to the outside; the information acquisition system comprises gas detectors and an information data processing computer, wherein the gas detectors are uniformly distributed in the inner space of the seal box clamping system, and the gas detectors are in signal connection with the information data processing computer.
Furthermore, the injection system comprises a carbon dioxide intermediate container, a surfactant intermediate container, a constant flow pump II and a six-way valve II, wherein the bottoms of the carbon dioxide intermediate container and the surfactant intermediate container are connected with the constant flow pump II, and the top of the carbon dioxide intermediate container and the surfactant intermediate container is connected with the six-way valve II. The six-way valve No. two is connected to an injection well in a seal chamber gripping system. The surfactant intermediate container stores surfactant solution which is easily obtained in a target area and has better foaming performance. The advection pump is connected with the carbon dioxide intermediate container in number two, the carbon dioxide is injected into the injection well in the sealed cavity clamping system, the surfactant intermediate container is connected, and the surfactant solution is injected into the injection well in the sealed cavity clamping system.
Furthermore, a saturation system is connected to the outside of the sealing cavity clamping system, the saturation system comprises a formation water intermediate container, a crude oil intermediate container, an air compressor, a first advection pump and a first six-way valve, the bottoms of the formation water intermediate container and the crude oil intermediate container are connected to the first advection pump, the top of the formation water intermediate container and the crude oil intermediate container is connected to the first six-way valve, and the air compressor is connected to the first six-way valve; the first six-way valve is connected to the sealing cavity clamping system. The formation water intermediate container is used for storing formation water of a target area, and the crude oil intermediate container is used for storing crude oil of the target area; the constant-current pump I is connected with the stratum water intermediate container to inject stratum water into the sealed cavity clamping system, and connected with the crude oil intermediate container to inject stratum crude oil into the sealed cavity clamping system to saturate stratum water, saturated crude oil and saturated air to the sealed cavity clamping device.
furthermore, the sealed cavity clamping system comprises a stratum water layer system, a crude oil layer system and a soil layer system. The distribution of a production well, an injection well, a gas detector, a stratum water layer system, a crude oil layer system and a soil layer system can be observed from the vertical direction. The injection well is perforated at the crude oil formation and the production well is perforated at the crude oil formation.
Furthermore, the production well is externally connected with a recovery metering system which is connected with the sealing cavity clamping system, the recovery metering system comprises an oil-gas separation meter and a six-way valve III, the six-way valve III is connected with the production well, and the oil-gas separation meter is connected with the six-way valve III and used for metering the variation of water production, oil production and gas production in the recovery process.
Furthermore, the sealed cavity clamping system is arranged in the constant temperature control box and comprises a sealed cavity clamp and a confining pressure tracking pump, wherein the sealed cavity clamp is a box body, sand is arranged in the sealed cavity clamp to simulate the stratum environment, the confining pressure tracking pump is connected to the bottom of the sealed cavity clamp, and the confining pressure tracking pump pumps water into a confining pressure cavity in the sealed cavity clamping system and gives stratum pressure through confining pressure. Confining pressure needs exist to meet formation pressures in different test environments.
A use method of the device for measuring the carbon dioxide migration law in the carbon dioxide flooding and sequestration comprises the following steps:
Step 1, filling a simulated stratum: sand of a specified mesh size is added to the capsule holder.
Step 2, simulating a saturated stratum environment: and a saturation system is adopted to carry out saturated formation water, saturated crude oil and saturated air on the sealed cavity clamping system.
Step 3, injecting a certain amount of carbon dioxide from an injection well by adopting an injection system for carbon dioxide flooding; the invention can realize the observation of the migration rule of the carbon dioxide in the carbon dioxide flooding process.
Step 4, recording the variable quantities of water production, oil production and gas production at different moments through an extraction metering system; in the carbon dioxide flooding process, the migration rule of carbon dioxide is observed along with the changes of oil production, gas production and water production in the crude oil exploitation process. The statistic of the produced quantity change is to make certain contrast and technical support for the oil displacement and sequestration of the carbon dioxide in the oil field, and a carbon dioxide migration field diagram at the moment of the produced degree can be obtained by observing the produced quantity change and the carbon dioxide migration path in different periods. And observing the migration and diffusion rules of the carbon dioxide in the stratum water layer system and the soil layer system in different periods in the process of the leakage of the carbon dioxide in the reservoir. Excessive diffusion in the water system may lead to increased water production, and excessive migration in the soil system may lead to decreased oil production. Therefore, the oil field can judge the migration condition of the carbon dioxide in the stratum by observing the change and the proportion of the produced quantity (including oil production, gas production and water production).
step 5, the migration rule of the carbon dioxide is proved and counted through an information acquisition system; and outputting the data of the concentration of the carbon dioxide measured by the gas detector along with the change of the concentration of the carbon dioxide along with the time. Carbon dioxide concentration data for each gas detector in the sealed chamber system at a time t0 may be obtained. The three-dimensional carbon dioxide concentration field diagram (and the concentration data values corresponding to different colors) in the sealing ring system at a certain moment can be obtained by representing the size of the concentration data by the color depth through the three-dimensional coordinates of the gas detector. And establishing three-dimensional carbon dioxide concentration field diagrams at different moments T to obtain the corresponding relation between the time axis T and the different moments T. The change of the three-dimensional carbon dioxide concentration field diagram at different moments T can be observed by adjusting the time axis T.
And 6, when the carbon dioxide reaches the leakage level, injecting a surfactant solution into the injection well through the injection system to block the carbon dioxide, wherein the leakage standards in different simulated environments are different from the specific judgment standard of 10-100ppm, and the concentration of the carbon dioxide in the local surface gas detector is more than 10ppm, so that the carbon dioxide can be judged to reach the leakage level.
in the step 1, sand with a specific mesh number is selected to fill the sealed cavity according to the porosity, the permeability and the oil-water-oil-gas saturation of the target block.
In step 2, the formation water is saturated to the formation water layer in the sealed cavity holder through the formation water intermediate container in the saturation system, and the crude oil is saturated to the crude oil layer in the sealed cavity holder through the crude oil intermediate container in the saturation system. And air saturation is carried out on the air layer system in the sealed cavity holder through an air compressor in the saturation system, and the air tightness is checked after a certain pressure is reached.
In step 3, a quantity of carbon dioxide is injected into an injection well in the sealed chamber gripping system through a carbon dioxide intermediate vessel in the injection system.
In step 4, the production well in the oil, gas and water sealing cavity clamping system is produced and led to a recovery metering system. And recording the variable quantities of water production, oil production and gas production at different moments by an extraction metering system.
In step 5, the content change of carbon dioxide at different positions in the sealed cavity clamping system is obtained through the gas detector in the sealed cavity clamping system. And wirelessly transmits the carbon dioxide to an information acquisition system to find out and count the migration rule of the carbon dioxide.
in step 6, the migration rule of the carbon dioxide is obtained through the information acquisition system. When the diffusion range of the carbon dioxide reaches a leakage threshold, a surfactant solution is injected into an injection well in the sealed chamber gripping system through a surfactant intermediate reservoir in the injection system. The large channel which is easy to diffuse carbon dioxide is blocked in a foam form, so that the carbon dioxide is prevented from continuously leaking. And meanwhile, observing the distribution rule of carbon dioxide in the information acquisition system, and judging whether the plugging technology reaches the expected standard.
A data processing method for measuring the carbon dioxide migration rule in the carbon dioxide flooding and sequestration comprises the following steps: the method comprises the following steps:
1) and outputting the data of the concentration of the carbon dioxide measured by the gas detector along with the change of the concentration of the carbon dioxide along with the time.
2) And determining the three-dimensional coordinates of the gas detector and the three-dimensional coordinates of the injection well and the production well.
3) And obtaining carbon dioxide concentration data of each gas detector in the sealed cavity system at a certain time t 0.
4) the three-dimensional carbon dioxide concentration field diagram (and the concentration data values corresponding to different colors) in the sealing ring system at a certain moment can be obtained by representing the size of the concentration data by the color depth through the three-dimensional coordinates of the gas detector.
5) and establishing three-dimensional carbon dioxide concentration field diagrams at different moments T to obtain the corresponding relation between the time axis T and the different moments T.
6) the change of the three-dimensional carbon dioxide concentration field diagram at different moments T can be observed by adjusting the time axis T.
Compared with the prior art, the invention has the beneficial effects that:
1. the simulation of the carbon dioxide displacement, the carbon dioxide diffusion and the carbon dioxide plugging process is realized, and the comprehensive process simulation is realized for the implementation of the carbon dioxide displacement and the carbon dioxide plugging on site.
2. the migration rule and the diffusion range of the carbon dioxide are observed in the carbon dioxide displacement process, the carbon dioxide is blocked in real time when the diffusion range of the carbon dioxide reaches the leakage threshold value, and the blocking technology is judged.
3. and observing the migration and diffusion rules of the carbon dioxide in the stratum water layer system and the soil layer system at different periods in the process of the leakage of the carbon dioxide in the reservoir. Excessive diffusion in the water system may lead to increased water production, and excessive migration in the soil system may lead to decreased oil production. Therefore, the oil field can judge the migration condition of the carbon dioxide in the stratum by observing the change and the proportion of the produced quantity (including oil production, gas production and water production).
4. The simulation of the carbon dioxide migration process under different well pattern conditions and different geological conditions is realized. By adjusting the position relation of the water layer system, the crude oil layer system and the soil layer system, process simulation of complex geological conditions including different deposition rhythmicity, fracture zones and the like and process simulation of different development modes under different geological conditions can be obtained.
Drawings
in order to more clearly illustrate the embodiments of the present invention 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, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic diagram of a saturation system according to the present invention;
FIG. 3 is a schematic view of the injection system of the present invention;
FIG. 4 is a schematic diagram of a capsule clamping system of the present invention;
FIG. 5 is a schematic diagram of the stoping metering system of the present invention;
FIG. 6 is a schematic structural diagram of an information acquisition system according to the present invention;
FIG. 7 is a top view of the interior of the capsule clamping system of the present invention;
FIG. 8 is a side view of the interior of the capsule clamping system of the present invention;
FIG. 9 is a cross-sectional view showing the distribution of carbon dioxide concentration when carbon dioxide leaks out in a soil layer by means of Tough software;
FIG. 10 is a cross-sectional view showing the distribution of carbon dioxide concentration during the carbon dioxide flooding process according to the present invention.
In the figure: 1. the system comprises a formation water intermediate container, 2, a crude oil intermediate container, 3, an air compressor, 4, a first advection pump, 5, a first six-way valve, 6, a second advection pump, 7, a surfactant intermediate container, 8, a carbon dioxide intermediate container, 9, a second six-way valve, 10, an injection well, 11, a production well, 12, a sealing cavity clamp, 13, a confining pressure tracking pump, 14, a third six-way valve, 15, an oil-gas separation meter, 16, an information data processing computer, 17, a gas detector, 18, a formation water layer system, 19, a crude oil layer system, 20 and a soil layer system.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to the drawings in the figures 1-10,
the first embodiment is as follows:
as shown in fig. 1: a device for measuring the migration rule of carbon dioxide in carbon dioxide flooding and sequestration comprises an injection system, a sealed cavity clamping system and an information acquisition system, wherein the sealed cavity clamping system is filled with sand, crude oil and formation water to simulate the formation conditions, and an injection well 10 and a production well 11 which are communicated with the bottom of the formation are arranged above the sealed cavity clamping system; the injection system is connected to the sealed chamber holding system and injects a certain amount of carbon dioxide through the injection well 10, and the production well 11 is used for discharging crude oil to the outside; the information acquisition system comprises a gas detector 17 and an information data processing computer 16, wherein the gas detector 17 is uniformly distributed in the inner space of the seal box clamping system, the gas detector 17 is in signal connection with the information data processing computer 16, and the injection well 10 is used for injecting carbon dioxide and simulating the carbon dioxide injection displacement of a field oil well. The production well 11 is used to observe the production of crude oil, formation water and carbon dioxide. The injection well 10 and the production well 11 are mobile and are used to simulate various patterns in the production of an oil field, the five-point pattern being described in the figure. The gas detector 17 is connected with an information acquisition system and is used for detecting and counting the migration rule of the carbon dioxide.
As shown in fig. 3: further, the injection system comprises a carbon dioxide intermediate container 8, a surfactant intermediate container 7, a constant-flow pump II 6 and a six-way valve II 9, wherein the bottoms of the carbon dioxide intermediate container 8 and the surfactant intermediate container 7 are connected with the constant-flow pump II 6, and the top of the carbon dioxide intermediate container 8 and the top of the surfactant intermediate container 7 are connected with the six-way valve II 9. The six-way valve No. 9 is connected to an injection well 10 in a sealed chamber gripping system. The surfactant intermediate container 7 stores a surfactant solution which is easily available in a target area and has a good foaming property. The advection pump No. two 6 is connected to the carbon dioxide intermediate vessel 8, injects carbon dioxide into the injection well 10 in the sealed cavity gripping system, is connected to the surfactant intermediate vessel 7, and injects a surfactant solution into the injection well 10 in the sealed cavity gripping system.
as shown in fig. 2: furthermore, a saturation system is connected to the outside of the sealed cavity clamping system, the saturation system comprises a formation water intermediate container 1, a crude oil intermediate container 2, an air compressor 3, a first advection pump 4 and a first six-way valve 5, the bottoms of the formation water intermediate container 1 and the crude oil intermediate container 2 are connected to the first advection pump 4, the top of the formation water intermediate container 1 and the crude oil intermediate container 2 is connected to the first six-way valve 5, and the air compressor 3 is connected to the first six-way valve 5; the six-way valve number 5 is connected to the seal chamber clamping system. The formation water intermediate container 1 stores formation water of a target area, and the crude oil intermediate container 2 stores crude oil of the target area; the advection pump I4 is connected with the stratum water intermediate container 1 to inject the stratum water into the sealed cavity clamping system, is connected with the crude oil intermediate container 2 to inject the stratum crude oil into the sealed cavity clamping system to saturate the stratum water, the saturated crude oil and the saturated air in the sealed cavity clamping system,
as shown in fig. 8, further, the sealed cavity clamping system includes a formation water layer 18, a crude oil layer 19 and a soil layer 20. The distribution of the production well 11, the injection well 10, the gas detector 17, the formation water layer 18, the crude oil layer 19 and the soil layer 20 can be observed from the vertical direction. The injection well 10 is perforated at the crude oil formation 19 and the production well 11 is perforated at the crude oil formation 19.
As shown in fig. 5: furthermore, the production well 11 is externally connected with a recovery metering system connected to the sealing cavity clamping system, the recovery metering system comprises an oil-gas separation meter 15 and a six-way valve three 14, the six-way valve three 14 is connected to the production well 11, and the oil-gas separation meter 15 is connected with the six-way valve three 14 and is used for metering the variation of water production, oil production and gas production in the recovery process.
as shown in fig. 4: furthermore, the seal cavity clamping system is arranged in the constant temperature control box and comprises a seal cavity clamp 12 and a confining pressure tracking pump 13, the confining pressure tracking pump 13 is connected to the seal cavity clamp 12, the confining pressure tracking pump 13 is also called a ring pressure tracking pump, is common equipment in a displacement experiment, can set pressure difference according to needs, and can automatically track and stably work.
Example two:
a use method of the device for measuring the carbon dioxide migration law in the carbon dioxide flooding and sequestration comprises the following steps:
Step 1, adding sand with a specific mesh number into a sealed cavity holder 12;
step 2, a saturation system is adopted to perform saturated formation water, saturated crude oil and saturated air on the sealed cavity clamping system;
Step 3, injecting a certain amount of carbon dioxide from the injection well 10 by using an injection system;
step 4, recording the variable quantities of water production, oil production and gas production at different moments through an extraction metering system;
Step 5, the migration rule of the carbon dioxide is proved and counted through an information acquisition system;
And 6, when the carbon dioxide reaches the leakage level, injecting a surfactant solution into the injection well 10 through an injection system to block the carbon dioxide.
In the step 1, sand with a specific mesh number is selected to fill the sealed cavity according to the porosity, the permeability and the oil-water-oil-gas saturation of the target block.
In step 2, the formation water is saturated to the formation water layer in the sealed chamber holder 12 through the formation water intermediate container 1 in the saturation system, and the crude oil is saturated to the crude oil layer in the sealed chamber holder 12 through the crude oil intermediate container 2 in the saturation system. And air saturation is carried out on the air layer system in the sealed cavity holder 12 through an air compressor 3 in the saturation system, and after a certain pressure is reached, the air tightness is checked.
In step 3, a quantity of carbon dioxide is injected into an injection well 10 in a sealed chamber gripping system through a carbon dioxide intermediate vessel 8 in the injection system.
In step 4, the production well 11 in the oil, gas and water seal chamber gripping system is produced to the production metering system. And recording the variable quantities of water production, oil production and gas production at different moments by an extraction metering system.
In step 5, the content variation of carbon dioxide at different positions in the sealed cavity clamping system is obtained by the gas detector 17 in the sealed cavity clamping system. And wirelessly transmits the carbon dioxide to an information acquisition system to find out and count the migration rule of the carbon dioxide.
In step 6, the migration rule of the carbon dioxide is obtained through the information acquisition system. When the diffusion range of the carbon dioxide reaches the leakage threshold, a surfactant solution is injected through a surfactant intermediate reservoir 7 in the injection system into an injection well 10 in the sealed chamber gripping system. The large channel which is easy to diffuse carbon dioxide is blocked in a foam form, so that the carbon dioxide is prevented from continuously leaking. And meanwhile, observing the distribution rule of carbon dioxide in the information acquisition system, and judging whether the plugging technology reaches the expected standard.
in step 1, the pressure of a target block is measured to be 3MPa, the porosity is measured to be 0.3, the permeability is measured to be 500 mu m2, the water saturation of a crude oil layer is measured to be 30%, and the water saturation of a soil layer is measured to be 30%. The sand is filled with 80-mesh natural sand and compacted.
In step 2, the stratum water intermediate container 1 is connected through a constant flow pump I4 to inject stratum water into a stratum water layer system 18 in the sealed cavity clamping system, and the crude oil intermediate container 2 is connected to inject stratum crude oil into a crude oil layer system 19 in the sealed cavity clamping system. The air compressor 3 is turned on to saturate the soil bed system 20 with air. In the saturation process, the sealed cavity is pressurized to the formation pressure of 3MPa through a confining pressure tracking pump 13 in the sealed cavity clamping system, and air needs to be continuously injected in the process, so that the simulated soil layer pressure is ensured. And after the saturation is finished, carrying out air tightness inspection on the sealed cavity.
In step 3, the carbon dioxide intermediate container 8 is opened through the advection pump II 6, and the underground converted volume of the carbon dioxide with the volume of 20pv crude oil layer series is injected into the injection well 10 in the sealed cavity clamping system.
in step 4, the six-way valve No. three 14 is controlled, and wellhead production is carried out by a certain well opening. The oil-gas separation meter 15 is used for measuring the variation of water production, oil production and gas production in the recovery process.
In step 5, the data of the gas detector 17 are counted by the carbon dioxide information data processing computer 16, the migration rule and the leakage condition of the carbon dioxide in the underground are observed, and a real-time path diagram of the carbon dioxide migration is made on the computer.
And 6, when the carbon dioxide reaches a detector closest to the ground, giving an alarm and early warning. At this time, the surfactant intermediate container 7 was opened by the advection pump No. 6, and the surfactant solution was continuously injected at 2ml/min into the injection well 10 in the sealed cavity holding system. Meanwhile, the carbon dioxide information data processing computer 16 observes the migration condition of the carbon dioxide and checks the blocking condition of the carbon dioxide.
example three:
as shown in fig. 9 and 10:
A data processing method for measuring the carbon dioxide migration rule in the carbon dioxide flooding and sequestration comprises the following steps: the method comprises the following steps:
1) and outputting the data of the concentration of the carbon dioxide measured by the gas detector 17 along with the change of the time.
2) The three-dimensional coordinates of the gas detector 17 and the three-dimensional coordinates of the injection well 10 and the production well are determined.
3) Carbon dioxide concentration data for each gas detector 17 in the sealed chamber system at a certain time t0 is obtained.
4) the three-dimensional carbon dioxide concentration field diagram in the sealing ring system at a certain moment can be obtained by representing the size of concentration data by the shade of color through the three-dimensional coordinates of the gas detector 17.
5) And establishing three-dimensional carbon dioxide concentration field diagrams at different moments T to obtain the corresponding relation between the time axis T and the different moments T.
6) The change of the three-dimensional carbon dioxide concentration field diagram at different moments T can be observed by adjusting the time axis T.
Comparative example:
A comparison experiment is carried out by utilizing the conventional numerical simulation method and the invention:
By comparing the migration of carbon dioxide in soil, whether the results of the numerical simulation method and the experimental method in the prior art are consistent or not is checked.
Step (1): in the prior art, a TMVOC module in Tough software is utilized, wherein the Tough software is a program for simulating the numerical value of multiphase fluid and heat migration in a pore/fracture medium, in recent years, the calculation requirement of large-scale or high-end nonlinear problem application is gradually increased, and the method is used for simulating the change rule of the carbon dioxide concentration when the carbon dioxide leaks in a soil horizon, such as the fields of radioactive waste treatment, carbon dioxide geological sequestration, environmental assessment and restoration, reservoir engineering, underground water hydrology and the like. A leakage point is arranged in the soil layer system, the leakage speed is 0.002Kg/s, and the migration rule of carbon dioxide after 5 years is simulated. The main control equation used therein (Helmig, 1997) is:
The mass accumulation term, the diffusion term, the convection term and the source and sink term form four parts of the mass conservation equation. The first three terms are related to phase components, and the sink and source terms represent the injection or production of the components (injection is positive and production is negative). Where ρ isαDenotes the density of the alpha phase (gas phase, liquid phase); sαRepresents the saturation of the alpha phase; n is a surface element ΓnAn upper normal vector pointing to the interior of the volume element Vn; i ═ 1,2, corresponding to two components CO2, H2O, respectively;represents the mass fraction of component i in the alpha phase;Tortuosity, a function of saturation; di，αIs the diffusion of component i in the alpha phasecoefficient: qiRepresents a source or sink of component i; q. q.sαIs the darcy velocity in the phase.
Wherein Helmig R.Multiphase flow and transport processes in the subsurface [ M ]. Berlin: springer Verlag, 1997.
(authors: Hellmiger: "rules of multiphase flow and migration in formations" [ Berlin: Shipringer, 1997 ]
And (2) simulating the carbon dioxide transport law by using the simulation device. The pressure of the target block is 3MPa, the porosity is 0.3, the permeability is 500 mu m2, the water saturation of the crude oil layer is 30 percent, and the water saturation of the soil layer is 30 percent. Natural sand of 80 meshes is adopted for filling and compacting. Carbon dioxide leaks were placed in injection well 10 near the soil layer and carbon dioxide displacement was performed according to the experimental procedure. When the recovery degree is 40%, a carbon dioxide concentration sectional view is obtained.
By comparing the migration of carbon dioxide in soil, the numerical simulation method and the experimental method are found to be consistent in result, namely, the phenomenon that the bottom of carbon dioxide shrinks and the top of carbon dioxide diffuses in a large scale can be shown in a soil layer. While fig. 9 can only illustrate the migration of carbon dioxide in the soil layer, fig. 10 can simulate the migration of carbon dioxide in the crude oil layer and the formation water layer, such as dissolution and diffusion. The device can simulate the migration condition of carbon dioxide in a soil layer well, and can also simulate the migration condition of carbon dioxide in a crude oil layer system and a stratum water layer system.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (9)
1. a device for measuring the migration rule of carbon dioxide in carbon dioxide flooding and sequestration comprises an injection system, a sealed cavity clamping system and an information acquisition system, wherein the sealed cavity clamping system is filled with sand, crude oil and formation water to simulate the formation conditions, and an injection well (10) and a production well (11) which are communicated with the bottom of the formation are arranged above the sealed cavity clamping system; the injection system is connected with the sealed cavity holding system and injects a certain amount of carbon dioxide through the injection well (10), and the production well (11) is used for discharging crude oil to the outside; the information acquisition system comprises gas detectors (17) and an information data processing computer (16), wherein the gas detectors (17) are uniformly distributed in the inner space of the seal box clamping system, and the gas detectors (17) are in signal connection with the information data processing computer (16).
2. The apparatus for measuring the law of carbon dioxide migration in carbon dioxide flooding and sequestration according to claim 1, characterized in that: the injection system include among carbon dioxide container (8), surfactant intermediate container (7), advection pump No. two (6) and six-way valve No. two (9), this carbon dioxide intermediate container (8) and this surfactant intermediate container (7) bottom are connected in this advection pump No. two (6), and the top is connected in six-way valve No. two (9), six-way valve No. two (9) connect injection well (10) in sealed chamber clamping system, advection pump No. two (6) connect carbon dioxide intermediate container (8), inject carbon dioxide into injection well (10) in sealed chamber clamping system in, and connect surfactant intermediate container (7).
3. The apparatus for measuring the law of carbon dioxide migration in carbon dioxide flooding and sequestration according to claim 2, characterized in that: the device comprises a sealed cavity clamping system, a saturated system, an air compressor, a horizontal flow pump I (4), a six-way valve I (5), a horizontal flow pump I (1), a horizontal flow pump II (2), a horizontal flow pump I (4), a horizontal flow pump II (5), a horizontal flow pump I (4), a horizontal flow pump II (5), a horizontal flow pump II (3), a horizontal flow pump II (5), a horizontal flow pump; the first six-way valve (5) is connected to the sealing cavity clamping system.
4. The apparatus for measuring carbon dioxide migration law in carbon dioxide flooding and sequestration according to claim 3, wherein: furthermore, the sealed cavity clamping system internally comprises a stratum water system (18), a crude oil system (19) and a soil system (20).
5. The apparatus for measuring the law of carbon dioxide migration in carbon dioxide flooding and sequestration according to claim 4, wherein: the production well (11) external connection recovery metering system connect in sealed chamber clamping system, the recovery metering system include oil-gas separation counter (15), six-way valve No. three (14) connect in production well (11), oil-gas separation counter (15) be connected with six-way valve No. three (14).
6. The apparatus for measuring the law of carbon dioxide migration in carbon dioxide flooding and sequestration according to claim 5, wherein: the sealing cavity clamping system is arranged in the constant temperature control box and comprises a sealing cavity clamping device (12) and a confining pressure tracking pump (13), the sealing cavity clamping device (12) is a box body, and the confining pressure tracking pump (13) is connected to the bottom of the sealing cavity clamping device (12).
7. a use method of a device for measuring a carbon dioxide migration rule in carbon dioxide flooding and sequestration comprises the following steps:
Step 1, adding sand with a specific mesh number into a sealed cavity holder (12);
Step 2, a saturation system is adopted to perform saturated formation water, saturated crude oil and saturated air on the sealed cavity clamping system;
step 3, injecting a certain amount of carbon dioxide from an injection well (10) by using an injection system;
Step 4, recording the variable quantities of water production, oil production and gas production at different moments through an extraction metering system;
Step 5, the migration rule of the carbon dioxide is proved and counted through an information acquisition system;
and 6, when the carbon dioxide reaches the leakage level, injecting a surfactant solution into the injection well (10) through an injection system to block the carbon dioxide.
8. The use method of the device for measuring the carbon dioxide migration law in the carbon dioxide flooding and sequestration according to claim 7, characterized in that: in the step 1, sand with a specific mesh number is selected to fill the sealed cavity according to the porosity, the permeability and the oil-water-oil-gas saturation of the target block.
In step 2, the formation water is saturated through the formation water intermediate container (1) in the saturation system to the formation water layer in the sealed cavity holder (12), and the crude oil is saturated through the crude oil intermediate container (2) in the saturation system to the crude oil layer in the sealed cavity holder (12). And air saturation is carried out on the air layer system in the sealed cavity holder (12) through an air compressor (3) in the saturation system, and after a certain pressure is reached, air tightness inspection is carried out.
In step 3, a quantity of carbon dioxide is injected into an injection well (10) in the sealed chamber gripping system through a carbon dioxide intermediate vessel (8) in the injection system.
in step 4, oil, gas and water are produced from a production well (11) in the sealed cavity clamping system and led to a recovery metering system, and the variable quantities of water production, oil production and gas production at different moments are recorded through the recovery metering system.
In step 5, the content change of carbon dioxide at different positions in the sealed cavity clamping system is obtained through a gas detector (17) in the sealed cavity clamping system. And wirelessly transmits the carbon dioxide to an information acquisition system to find out and count the migration rule of the carbon dioxide.
In step 6, the migration rule of the carbon dioxide is obtained through the information acquisition system, and when the diffusion range of the carbon dioxide reaches a leakage threshold value, a surfactant solution is injected into an injection well (10) in the sealed cavity clamping system through a surfactant intermediate container (7) in the injection system. The large channel in which carbon dioxide is easy to diffuse is blocked in a foam form, so that the carbon dioxide is prevented from being leaked continuously, the distribution rule of the carbon dioxide in the information acquisition system is observed, and whether the blocking technology reaches the expected standard or not is judged.
9. A data processing method of a device for measuring carbon dioxide migration law in carbon dioxide flooding and sequestration comprises the following steps: the method comprises the following steps:
1) Outputting data of the change of the concentration of the carbon dioxide measured by the gas detector (17) along with the time;
2) Determining the three-dimensional coordinates of a gas detector (17) and the three-dimensional coordinates of an injection well (10) and a production well;
3) Obtaining carbon dioxide concentration data of each gas detector (17) in the sealed cavity system at a certain time t 0;
4) The size of concentration data is represented by the shade of color through the three-dimensional coordinates of the gas detector (17), and a three-dimensional carbon dioxide concentration field diagram in the sealing ring system at a certain moment can be obtained;
5) establishing three-dimensional carbon dioxide concentration field diagrams at different moments T to obtain the corresponding relation between a time axis T and the different moments T;
6) The change of the three-dimensional carbon dioxide concentration field diagram at different moments T can be observed by adjusting the time axis T.
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