CN116498276A - GAGD-CCUS integrated method for high-dip-angle bottom water reservoir - Google Patents
GAGD-CCUS integrated method for high-dip-angle bottom water reservoir Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 81
- 238000000034 method Methods 0.000 title claims abstract description 45
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 114
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 57
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 57
- 238000012544 monitoring process Methods 0.000 claims abstract description 30
- 230000005484 gravity Effects 0.000 claims abstract description 26
- 239000007924 injection Substances 0.000 claims abstract description 24
- 238000002347 injection Methods 0.000 claims abstract description 24
- 230000008569 process Effects 0.000 claims abstract description 15
- 238000006073 displacement reaction Methods 0.000 claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims abstract description 13
- 239000000700 radioactive tracer Substances 0.000 claims abstract description 13
- 239000007788 liquid Substances 0.000 claims abstract description 12
- 230000007423 decrease Effects 0.000 claims abstract description 7
- 230000007774 longterm Effects 0.000 claims abstract description 7
- 239000008239 natural water Substances 0.000 claims abstract description 7
- 230000008859 change Effects 0.000 claims abstract description 5
- 238000011161 development Methods 0.000 claims description 21
- 230000005012 migration Effects 0.000 claims description 7
- 238000013508 migration Methods 0.000 claims description 7
- 230000009919 sequestration Effects 0.000 claims description 7
- 230000004069 differentiation Effects 0.000 claims description 5
- 229910018503 SF6 Inorganic materials 0.000 claims description 4
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical group FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 claims description 4
- 229960000909 sulfur hexafluoride Drugs 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 238000004458 analytical method Methods 0.000 claims description 2
- 238000004587 chromatography analysis Methods 0.000 claims description 2
- 239000003921 oil Substances 0.000 description 74
- 230000018109 developmental process Effects 0.000 description 20
- 238000010586 diagram Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 10
- 238000011084 recovery Methods 0.000 description 10
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- 230000015572 biosynthetic process Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
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- 238000004088 simulation Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
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- 238000009933 burial Methods 0.000 description 3
- 239000010779 crude oil Substances 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 230000010354 integration Effects 0.000 description 3
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 3
- 229910052622 kaolinite Inorganic materials 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229910021532 Calcite Inorganic materials 0.000 description 2
- 230000033558 biomineral tissue development Effects 0.000 description 2
- 229910001748 carbonate mineral Inorganic materials 0.000 description 2
- 229910000514 dolomite Inorganic materials 0.000 description 2
- 239000010459 dolomite Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 239000003129 oil well Substances 0.000 description 2
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- 230000000717 retained effect Effects 0.000 description 1
- 229910052604 silicate mineral Inorganic materials 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
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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
-
- 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
- E21B43/30—Specific pattern of wells, e.g. optimizing the spacing of wells
- E21B43/305—Specific pattern of wells, e.g. optimizing the spacing of wells comprising at least one inclined or horizontal well
-
- 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
- E21B43/32—Preventing gas- or water-coning phenomena, i.e. the formation of a conical column of gas or water around wells
-
- 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
- E21B47/10—Locating fluid leaks, intrusions or movements
- E21B47/11—Locating fluid leaks, intrusions or movements using tracers; using radioactivity
-
- 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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- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
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- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
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Abstract
The invention discloses a high-dip angle bottom water oil reservoir GAGD-CCUS integrated method, which comprises the following steps: s1, setting a straight well at the top of an oil reservoir as a gas injection well; setting a horizontal well in the middle of the oil reservoir as a production well; s2, carrying out failure type exploitation by using natural water energy of an oil reservoir in the horizontal well; when the yield of the horizontal well continuously decreases and the water content reaches a preset condition, continuously and slowly injecting carbon dioxide gas into the vertical well to perform gas-assisted gravity flooding; s3, in the gas-assisted gravity displacement process, when the yield of the horizontal well continuously decreases and the water content reaches a preset condition, converting the horizontal well into an injection well, injecting liquid carbon dioxide, converting the vertical well into a monitoring well, and carrying out carbon dioxide landfill; s4, a sectionAfter the time, adding a tracer into the injected carbon dioxide, and acquiring tracer data by a monitoring well to perform long-term monitoring of the carbon dioxide tracer; simultaneously analyzing and monitoring well flow HCO- 3 And the concentration and the pH value change to determine the filling stop time of the buried storage and reduce the risk of buried storage leakage.
Description
Technical Field
The invention relates to the technical field of carbon dioxide flooding and burying geological engineering integration, in particular to a high-dip-angle bottom water reservoir GAGD-CCUS integration method.
Background
To cope with global warming, carbon capture, utilization and sequestration technology (CCUS) has been developed, which is one of the most direct and effective ways to advance low carbon emission reduction. The CCUS technology gradually matures, and is an important means for reducing carbon dioxide emission and guaranteeing national energy safety in the future.
Carbon dioxide flooding is a technique of injecting carbon dioxide into an oil layer to improve oil recovery rate in an oil field. Indoor physical simulation CO 2 Gas-assisted gravity flooding (GAGD) long core experiments show that the gas-flooding oil-washing effect is good, and the core recovery rate is close to 100%. Mine site application of CO 2 The gas assisted gravity driving technology has the sweep efficiency reaching 90%, the recovery ratio exceeding 85%, the residual oil in the reservoir being reduced and CO being retained 2 The amount increases. And gradually closing the oil production well along with the high water content of the oil well in the later development period, and stopping the oil reservoir development. At this time, the top of the oil reservoir is high in carbon dioxide content, the bottom of the oil reservoir is provided with a larger water body, and the dissolution and storage amount is larger. Therefore, the high dip bottom water abandoned reservoir is advantageous as a natural geological location for the CCUS over conventional abandoned reservoirs.
Most of the down-the-hill oil reservoirs in China have the development problems of large reservoir dip angle, strong heterogeneity, high crude oil viscosity and the like, and meanwhile, part of the oil reservoirs also have the primary gas top and side bottom water conditions. Because of large oil-water density difference, the water injection development has low wave and efficiency and obvious tongue advance phenomenon, and meanwhile, the top attic oil is difficult to effectively use, thus being a difficulty in improving the recovery ratio. The GAGD technology utilizes the natural gravity differentiation effect to effectively separate oil and gas, form a stable oil and gas displacement front and inhibit viscous fingering. For a high-dip-angle bottom water oil reservoir, the advantage of natural water energy of the oil reservoir can be fully exerted by using the GAGD technology, meanwhile, the coning of the bottom water is effectively inhibited, the oil reservoir recovery ratio is greatly improved, and the high-efficiency development of the oil reservoir is realized. Patent CN 112240184a discloses a method and a system for improving recovery ratio by three-dimensional displacement of a low-permeability tight oil reservoir, the method does not consider the problem that an actual oil reservoir may have an inclination angle, meanwhile, the mode of injecting water first and pumping water later at the bottom of a vertical well is over-idealized, is not in line with the actual oil reservoir, and is difficult to effectively simulate the development of a bottom water oil reservoir with an inclination angle. Meanwhile, the existing method can only simulate the condition of single oil reservoir gas auxiliary gravity flooding, can not simultaneously simulate the characteristics of high-dip angle bottom water oil reservoir gas auxiliary gravity flooding and carbon dioxide burying, can not develop integrated operation from 'injection-oil reservoir-production' to 'reinjection-burying-monitoring' on oil reservoirs, and is difficult to obtain full and comprehensive actual mining field and numerical simulation knowledge.
Disclosure of Invention
Aiming at the problems that the existing oil reservoir development method is single in function and difficult to effectively simulate the development of a bottom water oil reservoir with an inclination angle, the invention provides a high-inclination-angle bottom water oil reservoir GAGD-CCUS integrated method.
The invention provides a high-dip angle bottom water reservoir GAGD-CCUS integrated method, which comprises the following steps:
s1, oil reservoir well pattern deployment: setting a vertical well at the top of an oil reservoir as a gas injection well; and a horizontal well is arranged in the middle of the oil reservoir and is used as a production well.
S2, reservoir development (GAGD): the horizontal well utilizes natural water energy of the oil reservoir to carry out failure type exploitation; when the yield of the horizontal well continuously decreases and the water content reaches a preset condition, the vertical well starts to continuously and slowly inject carbon dioxide gas, and a gas auxiliary gravity displacement process is carried out, so that the stability of the oil gas displacement front edge is ensured, and the coning of bottom water is inhibited.
S3, developing carbon dioxide sequestration (CCUS) of an oil reservoir: in the gas-assisted gravity flooding process, determining a buried flooding limit when the yield of the horizontal well continuously decreases and the water content reaches a preset condition; converting the horizontal well into an injection well, injecting liquid carbon dioxide, converting the vertical well into a monitoring well, and burying the carbon dioxide; under the influence of gravity differentiation and reservoir heterogeneity, carbon dioxide migrates in the formation and diffuses and dissolves in the bottom water.
The burying mechanism acts in the process of burying the oil reservoir: the horizontal well is continuously injected with liquid carbon dioxide, and most of carbon dioxide is accumulated at the bottom of an oil reservoir to form a structure for storage under the influence of gravity differentiation and reservoir heterogeneity; a small part of carbon dioxide is diffused and dissolved in the water body to form more stable dissolution and embedding; very little carbon dioxide chemically reacts with the water-rock to form stable mineralization and sequestration. CO mainly occurring 2 -the water-rock chemical reaction equation is as follows:
Kaolinite+6H + ＝5H 2 O+2SiO 2 (aq)+2Al 3+
wherein, calcite is Calcite, belongs to carbonate mineral, and has CaCO as main chemical component 3 The method comprises the steps of carrying out a first treatment on the surface of the Dolomite is Dolomite, belongs to carbonate mineral, and has main chemical component of CaMg (CO 3 ) 2 The method comprises the steps of carrying out a first treatment on the surface of the Kaolinite is Kaolinite, belongs to silicate mineral, and has main chemical component of Al 4 [Si 4 O 10 ](OH) 8 。
S4, monitoring the buried safety: in the carbon dioxide burying process, tracer is added into the injected liquid carbon dioxide at intervalsAnd after a plurality of days, performing chromatographic analysis on the monitoring well samples to obtain tracer data, performing long-term monitoring on the carbon dioxide tracer, and analyzing a possible migration path of carbon dioxide along a geological structure to ensure that a cover layer is not broken through, a fault is not slipped and a crack is not activated. Simultaneous analysis and monitoring of well stream HCO - 3 And the concentration and the pH value change to determine the filling stop time of the buried storage and reduce the risk of buried storage leakage.
Preferably, in step S2, the preset condition is that the water content reaches 30% or more.
Preferably, in step S3, the preset condition is that the water content exceeds 90%.
Preferably, in step S4, the method for determining the buried stop time is as follows: while monitoring well flowWhen the concentration and the pH value reach preset values, the horizontal well is shut down and stopped, and the monitoring well is continuously monitored.
Wherein, the liquid crystal display device comprises a liquid crystal display device,ion concentration preset value: CO 2 Dissolving to make the well stream more acidic, CO 2 Post injection well stream->The concentration increased significantly. Setting well stream HCO - 3 The ion concentration rises by 10% to a preset value.
pH value preset value: the original well stream was neutral and slightly alkaline (ph=6.8), CO was injected 2 The pH was then lowered to 5.3 (meta-acidic), and the pH was set to 1.5 point, i.e. 6.8 to 5.3, as preset.
Preferably, the tracer is sulfur hexafluoride (SF 6 ). Sulfur hexafluoride is chemically stable and hardly dissolves in formation water. SF (sulfur hexafluoride) 6 With CO 2 Good compatibility and SF 6 Hardly affect CO 2 The ability to dissolve and diffuse in water as injected CO 2 For monitoring CO 2 Plume path, prediction of CO 2 Possible migration paths, taking precautions in advance. Is suitable for long-term CO monitoring 2 Early warning of buried leakage.
The working principle process of the high-dip angle bottom water reservoir GAGD-CCUS integrated method is as follows:
firstly, continuous slow gas injection is carried out through a vertical well to form a stable oil gas displacement front edge, and CO is fully exerted 2 The functions of capacity expansion, viscosity reduction, effect improvement and the like are achieved, meanwhile, the utilization degree of the attic oil is obviously improved, and the coning of bottom water is inhibited. When the yield of the horizontal well continuously decreases and the water content exceeds 90%, the existing injection well pattern of the oil reservoir is utilized for burying. Gas assisted gravity flooding (GAGD) has a sweep efficiency of over 90%, high recovery, severe formation loss, and greater formation burial than conventional reservoir burial. Simultaneously, gas flooding utilizes the top vertical well of the oil reservoir to inject gas, and the middle horizontal well is utilized to inject liquid carbon dioxide in the process of CO (carbon dioxide) 2 Under the influence of concentration difference and gravity, injected CO 2 Rapidly occupies the low part of the oil reservoir, diffuses and moves in the bottom water, and finally slowly moves upwards along the dip angle. At this time, the well stream HCO- 3 The concentration, the pH value and the tracer are used for defining the time of filling and stopping the filling, so that the risk of filling and leakage is reduced. The method realizes the whole process of injection-oil reservoir-production-reinjection-embedding-monitoring.
Compared with the prior art, the invention has the following advantages:
(1) The GAGD-CCUS integrated method for the high-dip-angle bottom water reservoir fully exerts the natural water energy advantage of the reservoir by means of the characteristic of gravity difference of the gas cap and crude oil, effectively utilizes attic oil, and avoids the problems of slow effect, serious flooding and the like of a horizontal well caused by bottom water coning of the reservoir, thereby expanding the gas drive sweep range and improving the recovery ratio of the reservoir. Because the oil reservoir water is large and the deficiency is large, carbon dioxide burying is proposed, carbon dioxide burying and monitoring are carried out by utilizing the existing flooding well network in the later period of oil reservoir development, cost investment is reduced, and feasibility is high. The carbon dioxide is partially buried underground, and on one hand, the carbon dioxide is dissolved in water, and on the other hand, the carbon dioxide reacts with the rock. Moreover, the well pattern is converted for burying, so that the facility investment cost is reduced, the burying leakage risk is reduced, and the monitoring well is important for guaranteeing long-term and effective burying.
(2) The result of the integrated method can comprehensively reflect the change rules of underground diffusion migration and dissolution in the bottom water after the carbon dioxide is injected into the high-inclination bottom water oil reservoir and the change difference of the burying mechanism to the burying amount after the carbon dioxide is injected into the high-inclination bottom water oil reservoir, thereby providing more comprehensive and more reliable basis for formulating a reasonable implementation technical scheme of the high-inclination bottom water oil reservoir GAGD-CCUS.
(3) The GAGD has good oil displacement effect on the high-dip-angle bottom water reservoir and inhibits water channeling; switching well patterns, developing CCUS, and realizing geological engineering integration; the method and the system realize the whole process of injection-oil reservoir-production-reinjection-buried-monitoring, and have important application value for guaranteeing the long-term, stable and safe operation of the CCUS.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a schematic diagram of a high dip bottom water reservoir vertical well and horizontal well one-injection one-production well pattern deployment.
FIG. 2 is a schematic diagram of the gas-assisted gravity flooding enhanced recovery of a high dip bottom water reservoir of the present invention.
FIG. 3 is a schematic diagram of the principle of carbon dioxide action in the gas-assisted gravity flooding process of the high-dip bottom water reservoir of the present invention.
FIG. 4 is a schematic diagram of the gas assisted gravity flooding of the high dip bottom water reservoir of the present invention followed by CCUS development.
FIG. 5 is a schematic diagram of carbon dioxide migration in geologic formations and diffusion and dissolution in bottom water during the development of the CCUS.
Fig. 6 is a numerical simulation model in an application case.
FIG. 7 is a graph showing the simulated effect of stable gas flooding front formed by gas injection assisted gravity flooding in the application case.
FIG. 8 is a schematic diagram of carbon dioxide accumulation at the bottom of a high dip bottom water reservoir horizontal well transfer in an application case.
FIG. 9 is a graph showing various buried ratios of the CCUS developed by the simulation model in the application case.
Detailed Description
The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present invention only, and are not intended to limit the present invention.
In the step S1, a schematic diagram of the deployment of the vertical well and the horizontal well one-injection one-production well network is shown in FIG. 1.
The schematic diagram of the gas-assisted gravity driving in the step S2 is shown in fig. 2. The vertical well at the top of the oil reservoir is a gas injection well, the horizontal well at the middle of the oil reservoir is an oil extraction well, and a huge water body exists at the bottom of the oil reservoir. The injected carbon dioxide gas can ensure the stability of the oil gas displacement front edge and inhibit the coning of bottom water. FIG. 3 is a schematic illustration of carbon dioxide forming "cushion" in the lower portion of a horizontal well, effective to inhibit coning of bottom water and retard channeling of water.
In the step S3, the schematic diagram of the carbon dioxide sequestration effect of the oil reservoir is shown in FIG. 4. The vertical well at the top of the oil reservoir is a monitoring well, the horizontal well at the middle of the oil reservoir is an injection well, liquid carbon dioxide is injected, and water invasion at the bottom of the oil reservoir is serious. FIG. 5 is a schematic of carbon dioxide migration in a geologic formation and diffusion and dissolution in the bottom water.
Application case
The high-dip angle bottom water reservoir GAGD-CCUS integrated method is applied to an actual reservoir. The oil reservoir in the scheme is a high-dip-angle bottom water oil reservoir, the oil reservoir burial depth is 2000m, the original stratum pressure is 30MPa, the porosity is 0.15, the permeability is 100mD, the dip angle is 30 degrees, the multistage contact Minimum Miscible Pressure (MMP) is 29MPa, and the well pattern deployment (shown in figure 6) mode of combining horizontal wells and vertical wells is adopted, so that the well spacing is 210m. The specific implementation steps are as follows:
s1, arranging a horizontal well (800 m) in the middle of an oil reservoir, and performing failure type development by utilizing natural water energy of the oil reservoir in the early stage; because of the huge energy of the reservoir water, the production of fixed liquid volume (8000 m 3 And/d), on one hand, the energy of water is fully utilized, and on the other hand, the phenomenon that the well floods and stops production due to bottom water coning is prevented.
S2, after failure development for one year, the oil yield of the horizontal well is reduced to 10m 3 And/d, the water content rises, and the stratum energy is obviously insufficient. Continuous slow gas injection (10000 m) is started at the top of the oil reservoir in the vertical well 3 And/d), the liquid amount production of the horizontal well is fixed, and the production process of the injection-production ratio of 1.1 is simulated. The stable oil gas displacement front is formed, as shown in figure 7, the simulation effect is matched with the schematic diagram of figure 2, and the CO is fully exerted 2 The functions of capacity expansion, viscosity reduction, effect improvement and the like are achieved, and the utilization degree of the attic oil is obviously improved; along with CO 2 The wave range is continuously enlarged, and the coning of the bottom water is obviously improved.
S3, after the gas assisted gravity flooding development is carried out for five years, the oil yield of the horizontal well is continuously reduced to 0.5m 3 And/d, the water content exceeds 90%, and the oil well gas channeling and water channeling are serious; converting the horizontal well into an injection well, wherein the flow of injected liquid carbon dioxide is 100000m 3 And d, converting the vertical well into a monitoring well, and developing geological sealing.
The above embodiments (gas-assisted gravity displacement+co) were applied sequentially to this high dip bottom water reservoir 2 Integrated development of geological sequestration). In the continuous gas injection process of the horizontal well, most carbon dioxide is accumulated at the bottom of the oil reservoir under the influence of gravity differentiation and reservoir heterogeneity to form a structure for sealing; a small part of carbon dioxide is diffused and dissolved in the water body to form a relatively stable dissolution and sealing; a very small portion of the carbon dioxide chemically reacts with the water-rock to form a stable mineralized seal as shown in fig. 8, with a simulated effect that matches the schematic of fig. 4. The GAGD-CCUS integrated method effectively expands the sweep range, improves the recovery ratio of crude oil by 25.6%, and accumulates 24.06 ten thousand tons of buried carbon dioxide, wherein the constructional buried amount accounts for 66.63%, the dissolution buried amount accounts for 25.81%, and the mineralization buried amount accounts for 7.56% (figure 9).
In the embodiment, natural water energy of an oil reservoir is relied on in the early development stage, horizontal well failure development is adopted, well pattern deployment in which a vertical well and a horizontal well are combined is adopted in the middle stage, top gas injection auxiliary gravity drive and oil reservoir bottom water energy are driven in a combined mode, the later stage vertical well is converted into a monitoring well, the horizontal well is converted into a liquid carbon dioxide injection well, and GAGD-CCUS integrated development is carried out. The development mode is different from the conventional water injection, gas injection and buried storage methods, the attic oil utilization degree can be obviously improved, the bottom water coning is restrained, the gas injection wave range is enlarged, the integrated whole process of injection, oil reservoir production, reinjection, buried storage and monitoring is realized, and the method has important application value for guaranteeing the long-term, stable and safe operation of the CCUS.
The present invention is not limited to the above-mentioned embodiments, but is intended to be limited to the following embodiments, and any modifications, equivalents and modifications can be made to the above-mentioned embodiments without departing from the scope of the invention.
Claims (6)
1. The GAGD-CCUS integrated method for the high-dip-angle bottom water reservoir is characterized by comprising the following steps:
s1, oil reservoir well pattern deployment: setting a vertical well at the top of an oil reservoir as a gas injection well; setting a horizontal well in the middle of the oil reservoir as a production well;
s2, oil reservoir development: the horizontal well utilizes natural water energy of the oil reservoir to carry out failure type exploitation; when the yield of the horizontal well continuously decreases and the water content reaches a preset condition, the vertical well starts to continuously and slowly inject carbon dioxide gas, and a gas auxiliary gravity displacement process is carried out, so that the stability of the oil gas displacement front edge is ensured, and the coning of bottom water is inhibited;
s3, carrying out reservoir carbon dioxide sequestration: in the gas-assisted gravity displacement process, when the yield of the horizontal well continuously decreases and the water content reaches a preset condition, converting the horizontal well into an injection well, injecting liquid carbon dioxide, converting the vertical well into a monitoring well, and carrying out carbon dioxide burying; under the influence of gravity differentiation and reservoir heterogeneity, carbon dioxide moves in the stratum and is diffused and dissolved in bottom water;
s4, monitoring the buried safety: adding tracers to injected carbon dioxideThe monitoring well acquires tracer data, carries out long-term monitoring of the carbon dioxide tracer, analyzes the migration path of carbon dioxide along the geological structure, and ensures that the cover layer does not break through, the fault does not slip and the crack is not activated; simultaneous analysis and monitoring of well stream HCO - 3 And the concentration and the pH value change to determine the filling stop time of the buried storage and reduce the risk of buried storage leakage.
2. The method for integrating a high-dip bottom water reservoir with a GAGD-CCUS system of claim 1, wherein the water content in step S2 is up to 30%.
3. The method for integrating a high-dip bottom water reservoir with a GAGD-CCUS system of claim 1, wherein the predetermined condition in step S3 is that the water content exceeds 90%.
4. The method for integrating the high-dip bottom water reservoir GAGD-CCUS as set forth in claim 1, wherein in the step S4, a tracer is added to the injected liquid carbon dioxide at intervals during the carbon dioxide sequestration process, and after several days, a chromatographic analysis is performed on the monitoring well samples to obtain tracer data, and a migration path of the carbon dioxide along the geological structure is analyzed.
5. The method for integrating the high-dip bottom water reservoir GAGD-CCUS as set forth in claim 4, wherein in step S4, the method for determining the buried stop time is as follows: when monitoring well flow HCO - 3 When the concentration and the pH value reach preset values, the horizontal well is shut down and stopped, and the monitoring well is continuously monitored; well stream HCO - 3 The concentration rises by 10 percent to be a preset value; the pH value is reduced by 1.5 to be a preset value.
6. The method of integrating a high dip bottom water reservoir GAGD-CCUS of claim 5, wherein the tracer is sulfur hexafluoride.
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