CN117590485A - CO is sealed up to abandonment oil reservoir 2 Safety evaluation method - Google Patents
CO is sealed up to abandonment oil reservoir 2 Safety evaluation method Download PDFInfo
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- 238000007789 sealing Methods 0.000 claims abstract description 39
- 230000008569 process Effects 0.000 claims abstract description 30
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- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V11/00—Prospecting or detecting by methods combining techniques covered by two or more of main groups G01V1/00 - G01V9/00
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
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Abstract
The invention belongs to the waste oil reservoir CO sealing and preserving 2 The technical field of safety evaluation, in particular discloses a method for sealing and storing CO in a waste oil reservoir 2 A security evaluation method. Sequestration of CO for abandoned reservoirs 2 The invention firstly combines geological data and production data to build a geological model of a sealing body, and the mechanical parameters of the sealing body are measured by a mechanical experiment of reservoir rock, and then the sealing body is subjected to multi-phase CO 2 The displacement experiment is used for measuring core pore permeability parameters, then a numerical model is established, history fitting is carried out on the oil reservoir production stage, and then CO is stored in the abandoned oil reservoir 2 The whole process is simulated, and finally CO is stored in the abandoned oil reservoir 2 And (5) safety evaluation. The invention establishes a method for accurately judging the CO sealing of the abandoned oil reservoir 2 Safety method, supplementing CO 2 Related theory of geological sequestration, and also sequesters CO for abandoned reservoirs 2 Provides an advantageous guidance for the safe running of (a).
Description
Technical Field
The invention belongs to the waste oil reservoir CO sealing and preserving 2 The technical field of safety evaluation, in particular to a method for sealing and storing CO in a waste oil reservoir 2 A security evaluation method.
Background
Sequestration of CO from abandoned reservoirs 2 Is to realize CO 2 One of the main approaches of geological storage has important practical significance for achieving the aim of 'double carbon'. Reservoir sequestration of CO in a relatively conventional mode 2 (mainly injecting CO into reservoirs 2 Enhanced recovery of CO 2 -EOR), sequestration of CO by abandoned reservoirs 2 Further emphasis is placed on the security of sequestration, i.e. CO 2 Whether leakage occurs.
At present, CO sequestration for abandoned reservoirs 2 The studies of the safety evaluation method are mainly focused on two aspects: 1. study of CO injection 2 Judging the migration law of CO 2 Whether a cross flow occurs or not, and leakage is caused; 2. and (3) researching the permeability of the overburden rock and the change of mechanical properties in the sealing process, evaluating the integrity of the overburden, and evaluating the possibility of leakage. In the traditional evaluation method, only the influence of single factors such as fluid flow, rock stress-deformation and the like on the sealing safety is generally considered, the coupling effect between seepage and stress is neglected, and meanwhile, the method relates to CO 2 Physical and chemical reactions with reservoir rock and fluid after injection are also of little consideration for reservoir rock damage.
On the basis of previous researches, a brand new waste oil reservoir CO sealing-up method is established 2 The safety evaluation method uses numerical simulation as a tool, uses oilfield production data and fluid flow/rock mechanics experimental data as the basis, considers the influence of multiple factors such as fluid seepage, rock deformation and rock mass damage, and can implement CO on different lithology reservoirs 2 Security in sealingEvaluation of CO developed in different buried bodies, such as coal beds, gas reservoirs 2 Geological sequestration engineering may also provide advantageous guidelines.
Disclosure of Invention
The invention aims at the existing abandoned oil reservoir to seal CO 2 The problem of imperfect safety evaluation method provides a waste oil reservoir for sealing CO based on seepage-stress-damage coupling theory 2 A security evaluation method.
The specific steps of the invention are as follows:
s1, combining geological data and production data, establishing a geological model of the sealing body, wherein the model can visually display the distribution rules of various data such as porosity, permeability and the like which influence the fluid flow and rock stress/deformation, and the oil water distribution condition in the sealing body. The method comprises the following steps:
s11, using the seismic data and the well data as basic data, controlling the construction form of the corresponding layer through a construction diagram, and establishing construction modeling under the constraint of a digital contour line.
S12, adopting a phase control sequential Gaussian simulation method in a deterministic modeling technology, setting a proper variation function according to reservoir characteristics, restricting the spatial distribution rules of physical parameters such as porosity, permeability and the like of a sealing area, and establishing an attribute model of the sealing area.
S13, applying the established attribute model, and calculating the original geological reserves of the sealed-up area by combining logging interpretation to obtain a plane distribution map of the reserves.
And preparing the rock sample acquired by drilling into a standard rock core, performing rock mechanics experiments, and measuring mechanical parameters such as poisson ratio, elastic modulus and the like of reservoir rock.
S21: the experimental rock sample is processed into a cylinder with the length of 50mm multiplied by 100mm by using a core cutting and grinding machine, two ends are cut and ground to be flat and perpendicular to the axis of the cylinder, and the non-parallelism of the two end surfaces is less than 0.015 mm.
S22: the rock uniaxial compression experiment is carried out to obtain the strength parameters of the rock under different surrounding pressures; and drawing a stress-strain curve of the rock sample.
S23: and (3) carrying out triaxial cyclic loading/unloading experiments on the rock, and drawing a stress-strain curve of the rock sample under cyclic loading/unloading conditions according to experimental results.
And S3, preparing a rock sample acquired by drilling into a standard rock core, performing a rock core displacement experiment, and measuring an permeability curve and porosity and permeability data of reservoir rock under different displacement conditions.
S31, performing a porosity test and a permeability test on the processed rock sample to obtain porosity and permeability data respectively, wherein the porosity test adopts a Boyle' S law double-chamber method, and the permeability measurement adopts a Darcy formula.
S32, testing the permeability of the rock sample under the loading state and the unloading state according to different confining pressures, and drawing a change curve of the permeability of the rock sample along with effective stress.
S33, CO 2 Displacement experiments, measuring CO in different phases 2 And the porosity and permeability of the rock sample in the displacement process under different confining pressure conditions.
S4, converting the geological model into a numerical model, and selecting a rock stress-damage mechanical model from the numerical model; importing mechanical experimental data of a rock sample as initial conditions and stress-deformation constraints of a model, and setting an initial stress boundary of the model according to geological data; and providing an phase permeation curve in the fluid module and pore permeation parameters under different stress states by the step S3, performing history fitting on the oilfield development process after establishing a numerical model, and correcting the model according to a fitting result until fitting accuracy meets the requirement.
S5, to CO 2 The sealing process is simulated, and CO under different gas injection schemes is analyzed 2 And selecting an optimal gas injection scheme according to a distribution rule and a geomechanical response of the reservoir.
S6, analyzing data obtained in the simulation process to find out influence on CO 2 Main control factors of seal-up safety, and establishing seal-up CO of abandoned oil reservoirs 2 A method for evaluating safety.
Compared with the prior art, the invention has the beneficial effects that:
the invention utilizes dynamic and static data and experimental data of the oil field to determine the influence on CO by a numerical simulation method 2 Main control factor of seal security and CO 2 And key construction parameters such as gas injection quantity, injection speed and the like. The method introduces damage theory into the traditional seepage-stress model, so that the fluid flow and rock deformation and fracture process in the sealing process are more accurately described, and the CO is greatly improved 2 And (5) accuracy of the seal safety evaluation.
Drawings
For a clearer description of one or more embodiments of the present description or of the solutions of the prior art, the drawings that are necessary for the description of the embodiments or of the prior art will be briefly described, it being apparent that the drawings in the description below are only one or more embodiments of the present description, from which other drawings can be obtained, without inventive effort, for a person skilled in the art.
FIG. 1 is a three-dimensional view of porosity data according to an embodiment of the present application;
FIG. 2 is a three-dimensional view of permeability data according to an embodiment of the present application;
FIG. 3 is a stress-strain relationship under cyclic loading and unloading conditions in accordance with an embodiment of the present application;
FIG. 4 is a graph showing core permeability as a function of effective stress according to an embodiment of the present application;
FIG. 5 is a history-fit curve of production data according to an embodiment of the present application;
FIG. 6 is a three-dimensional distribution of gas saturation in an embodiment of the present application;
FIG. 7 is a graph of reservoir vertical displacement profile at various simulation times in accordance with an embodiment of the present application;
FIG. 8 is a graph of effective stress distribution of reservoirs at various simulation times in accordance with an embodiment of the present application.
Detailed Description
For the purposes of promoting an understanding of the principles and advantages of the disclosure, reference will now be made in detail to the following specific examples.
It is noted that unless otherwise defined, technical or scientific terms used in one or more embodiments of the present disclosure should be taken in a general sense as understood by one of ordinary skill in the art to which the present disclosure pertains. The use of the terms "first," "second," and the like in one or more embodiments of the present description does not denote any order, quantity, or importance, but rather the terms "first," "second," and the like are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.
The oil field with Wu-set oil grooves is 4+5 long 1 Block pack CO 2 Engineering examples a detailed embodiment of the invention is fully described in connection with the accompanying drawings, comprising the steps of:
s1, establishing a geological model
(1) Correcting the elevation data and the well deviation data of the heart, arranging wellhead data, well deviation data, layering data, fault data, phase data and logging analysis data, controlling the construction form of the corresponding layers through a construction diagram, and establishing a construction model of a target area according to the sequence of the layers after fault under the constraint of a digital contour line. Analysis was performed in conjunction with FIG. 1, with 4+5 lengths due to differential and non-uniform compaction of the different zone building motions 1 The block sand jack-up volts forms a banded bulge, small structures are developed on the bulge, the structures control the formation of oil gas, and further analysis is carried out, and oil gas is enriched in the sand body in small local bulge development areas above the bulge; whereas in relatively undeveloped areas the sand is low in oil and gas.
(2) And (3) setting a proper variation function according to reservoir characteristics by adopting a phase control sequential Gaussian simulation method in a deterministic modeling technology, effectively restricting a space distribution rule of physical properties according to physical property data statistical analysis of a phase separation unit, and establishing a porosity, permeability and N/G model of a sealing area.
FIGS. 1 and 2 show a groove length of 4+5 1 The porosity of the sandstone is distributed between 12.3 percent and 23.3 percent, the average porosity is 16.8 percent, and the result is matched with the experimental analysis data of the physical parameters, and the combination of 4+5 1 Reservoir sedimentary facies characterization, which is typically delta front sedimentary, with overall sand distribution being broad, thickness being large, sand particle size distribution characterized by jumping overall development, thus length 4+5 1 The regional reservoir is strongly heterogeneous in porosity. Permeability of 0.95-10.328X 10 -3 μm 2 Average permeability 5.784 ×10 -3 μm 2 In combination with filler characterization, the reservoir interstitials consist essentially of montmorillonite, chlorite, feldspar, quartzite, dolomite, etc., with a total interstitials of 14.56% and a higher filler content making the target zone a hypotonic zone.
(3) And fitting and calculating the pore volume and the original geological reserves of the sealed-up area by using the established attribute model. The formation effective volume, effective pore volume, oil-containing pore volume and air-containing pore volume data obtained by the attribute model have errors with data calculated by an empirical formula, so that the model data needs to be corrected, and a specific correction formula is as follows:
；
wherein, NV is the effective volume of the stratum; BV is the total volume of the stratum; N/G is the net wool ratio; PV is the effective pore volume; p (P) or Is porosity; PVo is the pore volume of the oil; s is S oil Is oil saturation; PVg the volume of the air-containing gaps; alpha is an effective pore volume correction coefficient; beta is the oil-containing pore volume correction coefficient; s is S gas Is the saturation of gas; phi is the correction coefficient of the void volume containing pores.
The oil length of the oil ditch is calculated by an empirical formula according to the determined reserve calculation parameters by 4+5 1 Ascertaining the oil geological reserves as 637.24 ×10 4 t, after correction, the final reserve is 602.21 ×10 4 t, error 5.5%.
S2, reservoir rock mechanics experiment
Measuring mechanical parameters such as elastic modulus, poisson ratio, internal friction angle, cohesion and the like of the rock through a uniaxial compression test, and taking the mechanical parameters as initial conditions of a geomechanical module in a numerical model; and the change rule of stress-strain of the rock in the repeated loading and unloading process is measured through a cyclic loading and unloading experiment and is used as the basis for judging the deformation damage of the rock in the sealing process.
As shown in Table 1, the increase in confining pressure resulted in a decrease in the Poisson's ratio of the reservoir rock, an increase in the elastic modulus, the shear modulus and the compressive strength, and the comparison was made with the actual measurement data of the rock sample taken from the 38-6 well, where the Poisson's ratio was 0.452, the elastic modulus was 7787.4MPa, the shear modulus was 2682.5MPa and the compressive strength was 70.5MPa when the confining pressure was increased to 26MPa, the Poisson's ratio was 0.211, the elastic modulus was 13650.6MPa, the shear modulus was 5636.1MPa and the compressive strength was 118.7MPa.
The slope of the unloading curve shown in fig. 3 decreases, indicating a change in the elastic modulus of the rock, and also demonstrating the effect of pressure changes in the recovery period on the mechanical properties of the rock, and the slope of the rock decreases from the initial 0.85 to 0.73 by 14% after 6 cycles of loading and unloading. The influence of cyclic loading and unloading on the residual strength of the rock mass is larger, the residual strength is gradually reduced along with the increase of cyclic loading and unloading times, and a residual strength attenuation fitting function is obtained according to data obtained by cyclic loading and unloading experiments:
；
where y is the percent change in residual intensity and x is the number of cycles.
S3, multiphase CO 2 Displacement experiment
S31, carrying out a core stress sensitivity experiment, measuring a change curve of core permeability along with effective stress by a method of fixing confining pressure and adjusting pore pressure, and determining loss rates of core permeability under different net confining pressures. Experimental results show that the size of the permeability is purifiedThe influence of confining pressure is specifically expressed as that the core permeability is reduced along with the increase of effective stress, the net confining pressure is increased in the loading process, the permeability is reduced along with the increase of the net confining pressure, the permeability is gradually recovered along with the decrease of the net confining pressure in the unloading process, but the final permeability of the core after unloading is smaller than an initial value, the damage to the core permeability caused by the loading and unloading process is shown, and the CO of the oil reservoir in the multi-round injection and production and storage stages of the production stage can also be shown 2 After injection, the permeability of the reservoir may change. FIG. 4 shows the permeability value of the core of the No. 38-6 well in the process of loading the net confining pressure from 5MPa to 30MPa and unloading, wherein the permeability is 32.8mD when the net confining pressure is 5MPa, the permeability is reduced to 29.2mD when the net confining pressure is increased to 30MPa, the permeability is restored to 31.3mD after the net confining pressure is unloaded to the initial value of 5MPa, and the permeability damage is 5.7% after the core is subjected to one loading and unloading process.
Obtaining a permeability fitting function according to permeability data measured by the core after a cyclic loading and unloading experiment,
the loading process comprises the following steps:
；
unloading process:
；
wherein K is permeability and mD; p (P) e Is net confining pressure, MPa.
S31, developing gaseous state, critical state and liquid state CO 2 In the (2) the indoor core displacement experiment, the reservoir rock and the CO with different phases are measured 2 Pore penetration change data after contact, and analyzing the CO exposure of reservoir rock 2 And (5) the change rule of the pore permeation parameters after corrosion.
Table 2 shows that the core was passing through CO 2 During displacement, the porous material is corroded by acid, so that the porosity is increased, the permeability is increased, and the porous material is treated by gaseous CO 2 For example, the porosity of the core is increased by 0.35% and the permeability is increased by 1.18% after displacement.
S4, establishing a numerical model of the sealing body and performing production history fitting
Coarsening a geological model, combining fluid property data and reservoir rock mechanics data obtained through experiments, establishing a numerical model of a sealing area, and dividing different infiltration areas according to a sediment microphase and a flow unit research result. Reservoir production stage history fits are developed on the basis of a numerical model, including raw geologic reservoir fits, reservoir pressure fits, and production data fits (fig. 5). And (3) adjusting model parameters according to a simulation result until the accuracy of data fitting meets the requirement, wherein in the simulation process, fitting degrees of pressure, oil reservoir oil production, oil reservoir water production, single well oil production and single well water production all reach more than 95%, which shows that the established model can truly reflect the geological characteristics of the sealing body and the distribution characteristics of fluid in the reservoir.
S5, sealing up CO in abandoned oil reservoirs 2 Full process simulation
Sequestration of CO for abandoned reservoirs 2 And simulating the process to obtain key data such as rock pore-permeation parameter change, fluid flow, rock stress, vertical displacement of the cover layer and the like in the sealing process.
CO in the sealing process 2 Is the main factor affecting the fluid distribution in the reservoir rock pores and the rock stress-deformation, as shown in FIG. 6, CO after injection 2 Is distributed in the reservoir in a reverse cone shape under the influence of pressure difference and concentration difference, and the characteristic is combined with CO detected by a monitoring point 2 The consistency of the concentration distribution rules indicates that the consistency of the fluid units set in the numerical model and the reservoir fluid characteristics is higher. FIG. 7 is a graph showing the distribution of reservoir vertical effective stress after 20 years of gas injection, showing CO 2 After injection, the vertical effective stress in the reservoir is reduced, wherein the reduction amplitude is maximum near the periphery of the well bore, the minimum vertical effective stress of the reservoir appears at the bottom of a 38-6 well after gas injection for one year, the minimum vertical effective stress is 9.22MPa, the detection data of the pressure monitoring equipment in the well bore is 8.85MPa, the error is 4%, and the simulation calculation precision requirement is met.
S6、Sequestration of CO from abandoned reservoirs 2 Safety evaluation
Data obtained in the simulation process are subjected to arrangement analysis, and judgment is carried out:
(1) whether the reservoir vertical displacement exceeds a limit value or not results in tensile failure of the reservoir rock. The vertical displacement of the ground surface is influenced by the lithology of the stratum and the burial depth of the sealed storage layer, and a common shallow sandstone stratum (within 3000 m) is considered to be safe, wherein the vertical displacement is not more than 2 per mill of the burial depth of the sealed storage layer, in the case, the maximum vertical displacement in the stratum is at a position of 38-6 wells and is 6.2cm and is lower than the upper limit value of the vertical displacement, so that the reservoir rock cannot be subjected to tensile failure;
(2) whether the reservoir rock pore pressure exceeds a limit value or not results in a compressive failure of the overburden rock. In this case, the initial pressure of the reservoir is 13.6MPa, and CO is injected 2 And then to 21.2MPa, (according to the effective stress principle, the reservoir pressure increase value is equal to the effective stress decrease value, the effective stress change value is shown in figure 8), and is lower than the upper breaking limit value of 24MPa (the depth of the cover layer is about 1900, according to the lithology judgment of the cover layer, the breaking pressure of the depth cover layer rock is about 32MPa, and 75% of the breaking pressure is taken as the upper breaking pressure limit value), thus CO 2 The implantation of (a) does not lead to cracking of the cap layer;
(3) whether CO occurs in the reservoir 2 Cross-flow, leakage of (c) leading to CO 2 The saturation distribution and reservoir pressure show abrupt changes.
Combining (1) (2) (3) with CO 2 Judging whether the sealing process is safe or not, and analyzing the safe construction parameters of the sealing area to obtain the sealing area with the gas injection pressure lower than 24MPa and the gas injection amount of 9000m 3 On day, the gas injection can be continued for 20 years, and finally CO 2 The cumulative sealing quantity is 1.97X10 8 m 3 Under the working condition, the safety of sealing can be ensured.
The invention relates to a method for sealing and preserving CO in a waste oil reservoir 2 In the safety evaluation method, the geological features of the oil reservoir, development dynamics and CO are comprehensively considered 2 The influence of factors such as fluid flow, rock stress-deformation/damage and the like on the sealing process after the injection into the stratum is combined with field patterns and data obtained by numerical simulation to CO 2 The qualitative and quantitative characterization of the factors influencing the sealing safety in the sealing process is carried out, and the method has obvious advancement and reliability.
Those of ordinary skill in the art will appreciate that: the discussion of any of the embodiments above is merely exemplary and is not intended to suggest that the scope of the disclosure, including the claims, is limited to these examples; combinations of features of the above embodiments or in different embodiments are also possible within the spirit of the present disclosure, steps may be implemented in any order, and there are many other variations of the different aspects of one or more embodiments described above which are not provided in detail for the sake of brevity.
The present disclosure is intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Any omissions, modifications, equivalents, improvements, and the like, which are within the spirit and principles of the one or more embodiments of the disclosure, are therefore intended to be included within the scope of the disclosure.
Claims (4)
1. CO is sealed up to abandonment oil reservoir 2 The safety evaluation method is characterized by comprising the following steps:
s1, establishing a geological model
Establishing a sealed body geological model by combining geological data and production data, and analyzing the distribution rules of various data such as porosity, permeability and the like which influence the flow of fluid and the stress and deformation of rock and the water distribution condition of oil in the sealed body;
s2, reservoir rock mechanics experiment
Preparing a rock sample acquired by drilling into a standard rock core, carrying out rock mechanics experiments, and measuring mechanical parameters such as poisson ratio, elastic modulus and the like of reservoir rock;
s3, multiphase CO 2 Displacement experiment
Preparing a rock sample acquired by drilling into a standard rock core, performing a rock core displacement experiment, and measuring an phase permeability curve and porosity and permeability data of reservoir rock under different displacement conditions;
s4, establishing a numerical model of the sealing body and performing production history fitting
Converting the geological model into a numerical model, and selecting a rock stress-damage mechanical model from the numerical model; importing mechanical experimental data of a rock sample as initial conditions and stress-deformation constraints of a model, and setting an initial stress boundary of the model according to geological data; the permeability curve in the fluid module and the pore permeability parameters under different stress states are calculated by the step S3 multi-phase state CO 2 The displacement experiment provides that after a numerical model is established, history fitting is carried out on the oil field development process, and the model is corrected according to a fitting result until fitting accuracy meets the requirement;
s5, sealing up CO in abandoned oil reservoirs 2 Full process simulation
For CO 2 The sealing process is simulated, and CO under different gas injection schemes is analyzed 2 The distribution rule and the geomechanical response of the reservoir are adopted, and an optimal gas injection scheme is selected;
s6, sealing up CO in abandoned oil reservoirs 2 Safety evaluation
Analyzing the result obtained by the simulation in the step 5 to find out the influence on CO 2 Main control factors of seal-up safety, and establishing seal-up CO of abandoned oil reservoirs 2 A method for evaluating safety.
2. A waste reservoir sequestering CO as defined in claim 1 2 The security evaluation method is characterized in that the specific implementation of the step S1 is as follows:
s11, controlling the construction form of the corresponding layer by using the seismic data and the well data as basic data through a construction diagram, and establishing construction modeling under the constraint of a digital contour line;
s12, adopting a phase control sequential Gaussian simulation method in a deterministic modeling technology, setting a proper variation function according to reservoir characteristics, effectively restricting the spatial distribution rule of physical properties, and establishing a porosity, permeability and N/G model of a sealing area;
and S13, applying the established attribute model to perform fitting calculation on the pore volume of the sealed-up area and the original geological reserves.
3. A waste reservoir sequestering CO as defined in claim 1 2 The security evaluation method is characterized in that the specific implementation of the step S2 is as follows:
s21, processing an experimental rock sample into a cylinder with standard length by using a HQM-1 core cutting mill, cutting and grinding two ends to be flat and perpendicular to the axis of the cylinder, wherein the non-parallelism of two end surfaces is less than 0.015 millimeter;
s22, rock uniaxial compression experiments are carried out to obtain compression strength, elastic modulus and poisson ratio data of the rock under different confining pressures; drawing a stress-strain curve of the rock sample;
s23, a triaxial cyclic loading/unloading experiment of the rock, and drawing a stress-strain curve of the rock sample under cyclic loading/unloading conditions according to experimental results.
4. A waste reservoir sequestering CO as defined in claim 1 2 The security evaluation method is characterized in that the specific implementation of the step S3 is as follows:
s31, performing a porosity test and a permeability test on the processed rock sample to obtain porosity and permeability data respectively, wherein the porosity test adopts a Boyle' S law double-chamber method, and the permeability measurement adopts a Darcy formula;
s32, stress sensitivity testing, namely testing the permeability of the rock sample in a loading state and an unloading state according to different confining pressures, and drawing a change curve of the permeability of the rock sample along with effective stress;
s33, CO 2 Displacement experiments, measuring CO in different phases 2 And the porosity and permeability of the rock sample in the displacement process under different confining pressure conditions.
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