CN-115203881-B - Method, device, equipment and storage medium for processing value of oil reservoir number of shale between salts

CN115203881BCN 115203881 BCN115203881 BCN 115203881BCN-115203881-B

Abstract

The application discloses a method, a device, equipment and a storage medium for processing the value of a shale oil reservoir number among salts. The method comprises the steps of establishing a numerical simulation model of a shale oil reservoir among salts to be simulated, obtaining initial characteristic parameters in the numerical simulation model and water passing times of each time step after water injection, adopting a preset reservoir pore permeation change mathematical characterization model according to the water passing times of each time step, respectively calculating pore permeation parameter change times of each time step under the action of salt dissolution and under the action of recrystallization, and respectively obtaining pore permeation parameters of each time step under the action of salt dissolution and under the action of recrystallization based on the initial characteristic parameters, the pore permeation parameter change times of each time step under the action of salt dissolution and under the action of recrystallization. The application can quantitatively obtain the pore-penetration parameter of each time step, embody the pore-penetration change condition, and can be used for accurately predicting the production capacity of an actual production well with salt dissolution and recrystallization phenomena.

Inventors

WANG HUAN
JI BINGYU
LUN ZENGMIN
LV CHENGYUAN
ZHAO SHUXIA
HE YINGFU
YU HONGMIN

Assignees

中国石油化工股份有限公司
中国石油化工股份有限公司
中国石油化工股份有限公司石油勘探开发研究院
中国石油化工股份有限公司石油勘探开发研究院

Dates

Publication Date: 20260421
Application Date: 20210409
Priority Date: 20210409

Claims (7)

1. The method for processing the value of the oil reservoir of the intersalt shale is characterized by comprising the following steps of: establishing a numerical simulation model of the shale oil reservoir among the salts to be simulated; Acquiring initial characteristic parameters in the numerical simulation model and water passing times of each time step after water injection; According to the water passing times of each time step, a preset reservoir pore-permeation change mathematical characterization model is adopted, and pore-permeation parameter change times of each time step under the action of salt dissolution and recrystallization are calculated respectively; based on the initial characteristic parameters, pore permeation parameter change multiples of each time step under the action of salt dissolution and recrystallization, pore permeation parameters of each time step under the action of salt dissolution and recrystallization are respectively obtained; The initial characteristic parameters comprise initial pore volume and initial conductivity, the pore permeability parameters comprise pore volume and conductivity, and the pore permeability parameter change times comprise pore volume change times and conductivity change times; The method comprises the steps of calculating pore-permeation parameter variation multiples of each time step under the action of salt dissolution and recrystallization respectively by adopting a preset reservoir pore-permeation variation mathematical characterization model according to water passing multiples of each time step, wherein the preset reservoir pore-permeation variation mathematical characterization model comprises a permeability variation mathematical characterization model, a porosity variation mathematical characterization model under the action of salt dissolution and a porosity variation mathematical characterization model under the action of recrystallization, and comprises the following steps: according to the water passing multiple of each time step, calculating the porosity change multiple under the action of salt dissolution based on a porosity change mathematical characterization model under the action of salt dissolution, and obtaining the pore volume change multiple under the action of salt dissolution; according to the water passing multiple of each time step, calculating the porosity change multiple under the recrystallization based on a porosity change mathematical characterization model under the recrystallization, and obtaining the pore volume change multiple under the recrystallization; Calculating the permeability change multiple under the action of salt dissolution and the permeability change multiple under the action of recrystallization based on the mathematical characterization model of the permeability change according to the porosity change multiple under the action of salt dissolution and the porosity change multiple under the action of recrystallization respectively to obtain the conductivity change multiple under the action of salt dissolution and the conductivity change multiple under the action of recrystallization; The porosity change mathematical characterization model under the salt dissolution comprises: ; Wherein, the Is the current porosity, dimensionless; is the original porosity, dimensionless; Is a porosity change multiple and is dimensionless; the mass of the rock sample is expressed in g; The mass percent of NaCl in the rock sample is dimensionless; The density of NaCl is in g/L; the water flow times of the injected water are dimensionless; the water pore times required by the full dissolution of NaCl in the rock sample are dimensionless; Is the mass percentage of glauberite in the rock sample, and is the decimal; is the density of glauberite, and the unit is g/L; is the recrystallization coefficient of glauberite, and has no dimension; The water pore times required by the complete dissolution of glauberite in a rock sample are dimensionless; Is the volume of the rock sample, unit L; the porosity change mathematical characterization model under the recrystallization action comprises: ; Wherein, the Is the current porosity, dimensionless; is the original porosity, dimensionless; Is a porosity change multiple and is dimensionless; to produce water flow times, dimensionless; the unit g/L is the NaCl crystallization rate under the current temperature and pressure; The density of NaCl is in g/L; The crystallization rate of glauberite under the current temperature and pressure is given in g/L; is the density of glauberite, and the unit is g/L; Is the volume of the rock sample, unit L; The permeability change mathematical characterization model comprises: ; Wherein, the The current permeability, unit D; the initial permeability, unit D; Is a permeability change multiple and is dimensionless; is the current porosity, dimensionless; is the original porosity, dimensionless; is the porosity change multiple; Is exponential and dimensionless.
2. The method according to claim 1, wherein the obtaining the pore permeation parameters of each time step under salt dissolution and recrystallization based on the initial characteristic parameters, the pore permeation parameter change multiples of each time step under salt dissolution and recrystallization, respectively, comprises: According to the initial characteristic parameters and the pore permeation parameter change times of the first time step under the action of salt dissolution, calculating to obtain pore permeation parameters of the first time step under the action of salt dissolution; According to the initial characteristic parameters and the pore permeation parameter change multiple of the first time step under the recrystallization, calculating to obtain the pore permeation parameter of the first time step under the recrystallization; sequentially calculating pore-permeation parameters of the next time step under the action of salt dissolution based on pore-permeation parameters of the previous time step under the action of salt dissolution and pore-permeation parameter change multiples of the next time step under the action of salt dissolution; and sequentially calculating pore-penetration parameters of the next time step under the recrystallization based on the pore-penetration parameters of the first time step under the recrystallization and the pore-penetration parameter change multiples of the next time step under the recrystallization.
3. The method according to claim 1, wherein the obtaining the pore permeation parameters of each time step under salt dissolution and recrystallization based on the initial characteristic parameters, the pore permeation parameter change multiples of each time step under salt dissolution and recrystallization, respectively, further comprises: And updating the pore-penetration parameters of each time step in the numerical simulation model.
4. The method according to claim 1, wherein the obtaining the pore permeation parameters of each time step under salt dissolution and recrystallization based on the initial characteristic parameters, the pore permeation parameter change multiples of each time step under salt dissolution and recrystallization, respectively, further comprises: And solving seepage characteristic parameters in the numerical simulation model based on the pore-seepage parameters and a preset calculation equation.
5. An inter-salt shale oil reservoir number processing apparatus for implementing the inter-salt shale oil reservoir number processing method of any one of claims 1-4, comprising: the model building module is used for building a numerical simulation model of the shale oil reservoir among the salts to be simulated; the data reading module is used for acquiring initial characteristic parameters in the numerical simulation model and water passing times of each time step after water injection; The calculation processing module is used for calculating pore-permeation parameter change multiples of each time step under the action of salt dissolution and recrystallization respectively by adopting a preset reservoir pore-permeation change mathematical characterization model according to the water passing multiples of each time step; The parameter acquisition module is used for respectively acquiring the pore permeability parameters of each time step under the action of salt dissolution and the action of recrystallization based on the initial characteristic parameters, the pore permeability parameter change multiples of each time step under the action of salt dissolution and the action of recrystallization.
6. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any of claims 1 to 4 when the computer program is executed.
7. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 4.

Description

Method, device, equipment and storage medium for processing value of oil reservoir number of shale between salts Technical Field The invention relates to the technical field of oil and gas exploitation, in particular to a method, a device, equipment and a storage medium for processing the value of a shale oil reservoir number among salts. Background The shale oil reservoir contains a large amount of salt minerals, and water enters the reservoir during hydraulic fracturing and water flooding development to dissolve the salt minerals. For example, salt minerals generally comprise glauberite and halite, glauberite is a mixture of sodium sulfate and calcium sulfate, sodium sulfate in the mixture dissolves in water and calcium sulfate is crystallized in water to form gypsum, and the salt minerals are dissolved in water and carried near a near well in the exploitation process, and the salt minerals can be recrystallized with the change of concentration, temperature and pressure to block seepage channels and shafts near the well. It can be seen that the occurrence of salt dissolution and recrystallization can cause the change of the porosity and permeability of the reservoir, influence the seepage capability of the reservoir, and finally influence the production dynamics of the production well. However, at present, quantitative analysis on pore permeability change of a reservoir under the actions of salt dissolution and recrystallization is not available, and seepage capability cannot be accurately analyzed, so that production prediction cannot be accurately performed. Disclosure of Invention The invention aims to solve the technical problems that in the prior art, quantitative analysis on pore permeation change caused by salt dissolution and recrystallization of a reservoir is lacking, so that production prediction is inaccurate. In order to solve the technical problems, the invention provides a method, a device, equipment and a storage medium for processing the value of the oil reservoir of the intersalt shale. A method for processing a value of an intersalt shale oil reservoir, comprising: establishing a numerical simulation model of the shale oil reservoir among the salts to be simulated; Acquiring initial characteristic parameters in the numerical simulation model and water passing times of each time step after water injection; According to the water passing times of each time step, a preset reservoir pore-permeation change mathematical characterization model is adopted, and pore-permeation parameter change times of each time step under the action of salt dissolution and recrystallization are calculated respectively; And obtaining pore permeation parameters of each time step under the action of salt dissolution and the action of recrystallization respectively based on the initial characteristic parameters, the pore permeation parameter change multiples of each time step under the action of salt dissolution and the action of recrystallization. In one embodiment, the initial characteristic parameters include an initial pore volume and an initial conductivity, the pore volume parameter includes a pore volume and a conductivity, and the pore parameter change factor includes a pore volume change factor and a conductivity change factor. In one embodiment, the preset reservoir pore-permeation change mathematical characterization model comprises a permeability change mathematical characterization model, a porosity change mathematical characterization model under the action of salt dissolution and a porosity change mathematical characterization model under the action of recrystallization, wherein the pore-permeation parameter change multiples of each time step under the action of salt dissolution and the action of recrystallization are respectively calculated by adopting the preset reservoir pore-permeation change mathematical characterization model according to the water passing multiple of each time step, and the method comprises the following steps: according to the water passing multiple of each time step, calculating the porosity change multiple under the action of salt dissolution based on a porosity change mathematical characterization model under the action of salt dissolution, and obtaining the pore volume change multiple under the action of salt dissolution; according to the water passing multiple of each time step, calculating the porosity change multiple under the recrystallization based on a porosity change mathematical characterization model under the recrystallization, and obtaining the pore volume change multiple under the recrystallization; and calculating the permeability change multiple under the action of salt dissolution and the permeability change multiple under the action of recrystallization based on the mathematical characterization model of the permeability change according to the porosity change multiple under the action of salt dissolution and the porosity change multiple under the action o