Refracturing optimization design method and device based on current three-dimensional mechanical model

Abstract

The invention relates to the technical field of oil production engineering, in particular to a refracturing optimization design method and device based on a current three-dimensional mechanical model, and the method comprises the steps: building a current three-dimensional mechanical numerical model according to production data and an original three-dimensional mechanical numerical model; generating a refracturing numerical model according to the well bore structure data; according to the set pump injection program, the refracturing transformation volume corresponding to each pump injection program of each well is determined; the yield corresponding to each pump injection program of each well is predicted, and an after-pressure productivity curve is drawn; and the optimal refracturing design corresponding to each well is determined. The method aims at solving the problems that an existing refracturing optimization design method only considers an original mechanical environment and rock mechanical parameters and does not consider the influence of dynamic changes of a reservoir seepage field, a pressure field and a stress field after development on cracks, so that the optimal fracturing effect cannot be achieved, and the final recovery ratio is influenced.

Description

Technical Field

[0001] The present invention relates to the technical field of oil production engineering, and in particular to a repeated fracturing optimization design method and device based on a current three-dimensional mechanical model. Background Art

[0002] Refracturing is to re-perforate and fracture the wells in the block or fracture the original fractures to improve the original fracture conductivity and increase the reservoir transformation volume, thereby increasing the ultimate recovery rate of the reservoir. As an economical and effective replacement technology, refracturing technology has been promoted and applied in shale gas exploration and development in North America and the Sichuan Basin.

[0003] Previous methods for optimizing the design of repeated fracturing referred to the rock mechanical parameters under the original mechanical environment of the target block. They did not take into account the actual situation that with the development of the oil field, the reservoir seepage field, pressure field, and stress field change dynamically, and the laws of fracture initiation and extension change accordingly, resulting in a lack of specificity in the optimization design method of repeated fracturing. Summary of the invention

[0004] The present invention proposes a repeated fracturing optimization design method and device based on the current three-dimensional mechanical model to solve the problem that the existing repeated fracturing optimization design method only considers the original mechanical environment and rock mechanics parameters, but does not consider the impact of the dynamic changes of the reservoir seepage field, pressure field, and stress field after development on the cracks, resulting in the inability to achieve the optimal fracturing effect, thereby affecting the final recovery rate.

[0005] According to one aspect of the present invention, a repeated fracturing optimization design method based on a current three-dimensional mechanical model is provided, comprising:

[0006] Obtain production data of the target block, wellbore structure data and original three-dimensional mechanical numerical model;

[0007] Establishing a current three-dimensional mechanical numerical model based on the production data and the original three-dimensional mechanical numerical model;

[0008] According to the wellbore structure data and the current three-dimensional mechanical numerical model, respectively determine the refracturing segments corresponding to each well in the target block, and generate a refracturing numerical model;

[0009] Setting a number of pumping programs, and determining the re-fracturing reconstruction volume corresponding to each pumping program of each well according to the pumping programs and the re-fracturing numerical model;

[0010] According to the repeated fracturing reconstruction volume, the production corresponding to each pumping procedure of each well is predicted respectively, and a post-fracturing capacity curve is drawn. According to the post-fracturing capacity curve, the optimal repeated fracturing design corresponding to each well is determined respectively.

[0011] Preferably, before obtaining the original three-dimensional mechanical numerical model of the target block, an original three-dimensional mechanical numerical model is established, and the method includes:

[0012] Establish well group numerical model, layered structure numerical model and attribute numerical model respectively;

[0013] A three-dimensional geological numerical model is established based on the well group numerical model, the layered structure numerical model, and the attribute numerical model;

[0014] According to the three-dimensional geological numerical model, an original one-dimensional mechanical numerical model is established;

[0015] Boundary conditions are set, a three-dimensional density body and an acoustic wave body are established, and an original three-dimensional mechanical numerical model is established based on the boundary conditions, the three-dimensional density body, the acoustic wave body and the original one-dimensional mechanical numerical model.

[0016] Preferably, the production data at least includes: liquid production, oil production, water content and production time.

[0017] Preferably, the method for establishing a current three-dimensional mechanical numerical model based on the production data and the original three-dimensional mechanical numerical model comprises:

[0018] Inputting the production data into the original three-dimensional mechanical numerical model to obtain the current pore pressure, dynamic elastic parameters, static elastic parameters and ground stress parameters of the target block;

[0019] According to the pore pressure, dynamic elastic parameters, static elastic parameters and ground stress parameters, a current three-dimensional mechanical numerical model is established.

[0020] Preferably, the wellbore structure data at least includes: well casing data, oil pipe data and perforation completion data.

[0021] Preferably, the method of determining the refracturing segments corresponding to each well in the target block according to the wellbore structure data and the current three-dimensional mechanical numerical model and generating the refracturing numerical model comprises:

[0022] The wellbore structure data is input into the current three-dimensional mechanical numerical model, and the refracturing segment corresponding to each well in the target block is determined according to the quality to obtain a refracturing numerical model.

[0023] Preferably, according to the pumping program and the re-fracturing numerical model, the method for determining the re-fracturing reconstruction volume corresponding to each pumping program of each well comprises:

[0024] Inputting each pumping program into the repeated fracturing numerical model respectively, and obtaining the artificial fracture length, fracture height and fracture width of each fracturing section corresponding to each pumping program of each well respectively;

[0025] According to the artificial fracture length, fracture height and fracture width, respectively determine the repeated fracturing reconstruction volume of each fracturing stage corresponding to each pumping procedure of each well;

[0026] The re-fracturing reconstruction volumes of all fracturing stages corresponding to each pumping procedure of each well are added together to obtain the re-fracturing reconstruction volume corresponding to each pumping procedure of each well.

[0027] Preferably, the method of respectively predicting the production corresponding to each pumping procedure of each well comprises:

[0028] Based on the re-fracturing stimulation volume, the production of each well corresponding to each pumping procedure is predicted one month, three months, twelve months and twenty-four months after re-fracturing.

[0029] Preferably, the method for determining the optimal refracturing design corresponding to each well according to the post-fracturing productivity curve comprises:

[0030] Among all the post-pressure production curves corresponding to each well, the curve with the highest production value corresponding to the inflection point is the optimal curve;

[0031] If there are multiple curves with the same production value corresponding to the inflection points, the curve with the shortest inflection point corresponding time is selected as the optimal curve, and the pumping program corresponding to the optimal curve is the optimal repeated fracturing program for the well;

[0032] According to the optimal re-fracturing scheme, an optimal re-fracturing design for the corresponding well is prepared.

[0033] According to one aspect of the present invention, a repeated fracturing optimization design device based on a current three-dimensional mechanical model is provided, comprising:

[0034] An acquisition unit is used to acquire production data of the target block, wellbore structure data and original three-dimensional mechanical numerical model;

[0035] A current three-dimensional mechanical model building unit, used to build a current three-dimensional mechanical numerical model according to the production data and the original three-dimensional mechanical numerical model;

[0036] A re-fracturing model building unit, for determining the re-fracturing segment corresponding to each well in the target block according to the wellbore structure data and the current three-dimensional mechanical numerical model, and generating a re-fracturing numerical model;

[0037] A re-fracturing reconstruction volume determination unit is used to set a plurality of pumping programs, and determine the re-fracturing reconstruction volume corresponding to each pumping program of each well according to the pumping programs and the re-fracturing numerical model;

[0038] The optimal repeated fracturing design unit is used to predict the production corresponding to each pumping procedure of each well according to the repeated fracturing reconstruction volume, and draw a post-fracturing capacity curve, and determine the optimal repeated fracturing design corresponding to each well according to the post-fracturing capacity curve.

[0039] The present invention proposes a repeated fracturing optimization design method and device based on the current three-dimensional mechanical model, which fully considers the actual problem that the dynamic changes in the reservoir seepage field, pressure field and stress field caused by the development of the oil field, and the changes in the crack initiation and extension laws, and establishes the current three-dimensional mechanical numerical model and the reservoir engineering integrated repeated fracturing numerical model through the block production history fitting and mechanical evolution, so as to improve the targetedness of repeated fracturing transformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The accompanying drawings herein are incorporated into and constitute a part of the specification. These drawings illustrate embodiments consistent with the present invention and, together with the specification, are used to explain the technical solutions of the present invention.

[0041] Figure 1 A flowchart showing a repeated fracturing optimization design method based on a current three-dimensional mechanical model according to an embodiment of the present invention is shown;

[0042] Figure 2 The productivity prediction curves of 11Y43-D53 well repeated fracturing schemes 1, 2 and 3 according to an embodiment of the present invention are shown. DETAILED DESCRIPTION

[0043] Various exemplary embodiments, features and aspects of the present invention will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0044] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0045] The term "and / or" herein is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the term "at least one" herein represents any combination of at least two of any one or more of a plurality of. For example, including at least one of A, B, and C can represent including any one or more elements selected from the set consisting of A, B, and C.

[0046] In addition, in order to better illustrate the present invention, numerous specific details are provided in the following specific embodiments. It should be understood by those skilled in the art that the present invention can be implemented without certain specific details. In some examples, methods, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present invention.

[0047] Figure 1 A flowchart showing a repeated fracturing optimization design method based on a current three-dimensional mechanical model according to an embodiment of the present invention is shown; Figure 2 The production capacity prediction curves of 11Y43-D53 well repeated fracturing schemes 1, 2 and 3 according to an embodiment of the present invention are shown. Figure 1-2 As shown, a repeated fracturing optimization design method based on the current three-dimensional mechanical model includes: step S01: obtaining the production data of the target block, the wellbore structure data and the original three-dimensional mechanical numerical model; step S02: establishing the current three-dimensional mechanical numerical model according to the production data and the original three-dimensional mechanical numerical model; step S03: determining the repeated fracturing segment corresponding to each well in the target block according to the wellbore structure data and the current three-dimensional mechanical numerical model, and generating a repeated fracturing numerical model; step S04: setting a number of pumping programs, and determining the repeated fracturing transformation volume corresponding to each pumping program of each well according to the pumping programs and the repeated fracturing numerical model; step S05: predicting the production corresponding to each pumping program of each well according to the repeated fracturing transformation volume, and drawing the post-fracturing capacity curve, and determining the optimal repeated fracturing design corresponding to each well according to the post-fracturing capacity curve.

[0048] The repeated fracturing optimization design method based on the current three-dimensional mechanical model provided by the embodiment of the present invention specifically includes the following steps:

[0049] Step S01: Obtaining target block production data, wellbore structure data and original three-dimensional mechanical numerical model;

[0050] In the present invention, before obtaining the original three-dimensional mechanical numerical model of the target block, an original three-dimensional mechanical numerical model is established, and the method includes: respectively establishing a well group numerical model, a layered structural numerical model and an attribute numerical model; establishing a three-dimensional geological numerical model according to the well group numerical model, the layered structural numerical model and the attribute numerical model; establishing an original one-dimensional mechanical numerical model according to the three-dimensional geological numerical model; setting boundary conditions, establishing a three-dimensional density body and an acoustic wave body, and establishing an original three-dimensional mechanical numerical model according to the boundary conditions, the three-dimensional density body, the acoustic wave body and the original one-dimensional mechanical numerical model.

[0051] In an embodiment of the present invention, a method for establishing a well group numerical model includes: obtaining single well horizontal and vertical coordinate data, single well trajectory data, single well GR (gamma) and resistivity logging data of each well a1, a2...an in the target block; inputting the horizontal and vertical coordinate data, single well trajectory data, single well GR and resistivity logging data into numerical simulation software, and using the numerical simulation software to establish a well group numerical model. The numerical simulation software is an existing three-dimensional visual modeling software, such as Petrel software.

[0052] The method for establishing a hierarchical structure numerical model includes: obtaining geological stratification data, lithology data and fault data of a target block; inputting the geological stratification data, lithology data and fault data into numerical simulation software, and using the numerical simulation software to establish a hierarchical structure numerical model.

[0053] The method for establishing a property numerical model includes: obtaining oil, gas and water saturation, permeability and porosity data of the target block; inputting the oil, gas and water saturation, permeability and porosity data into numerical simulation software, and using the numerical simulation software to establish a property numerical model.

[0054] A method for establishing a three-dimensional geological numerical model based on a well group numerical model, a layered structural numerical model, and an attribute numerical model includes: coupling the well group numerical model, the layered structural model, and the attribute numerical model, establishing an operational relationship between the three, and forming a three-dimensional geological numerical model of a target block.

[0055] A method for establishing an original one-dimensional mechanical numerical model according to a three-dimensional geological numerical model comprises: obtaining the acoustic wave and density single-well logging data of each well a1, a2...an in a target block; performing quality control on the acoustic wave and density single-well logging data, wherein the quality control comprises eliminating invalid values ​​contained therein and unifying the data format; inserting the acoustic wave and density single-well logging data of each well after quality control into the corresponding well group numerical model contained in the three-dimensional geological numerical model, so as to calculate the overlying formation pressure, pore pressure, dynamic elastic parameters, static elastic modulus parameters and geostress parameters of each well a1, a2...an in the target block respectively; and establishing the original one-dimensional mechanical numerical model according to the overlying formation pressure, pore pressure, dynamic elastic parameters, static elastic modulus parameters and geostress parameters.

[0056] The boundary condition is to set a constant pressure or constant production condition; the three-dimensional density body and the acoustic wave body are formed by the acoustic wave logging data of all wells in the target block, and the density body is formed by the density logging data of all wells. The method for establishing the original three-dimensional mechanical numerical model includes: inputting the three-dimensional density body and the acoustic wave body into the original one-dimensional mechanical numerical model to obtain the original three-dimensional mechanical numerical model.

[0057] Step S02: Establishing a current three-dimensional mechanical numerical model based on the production data and the original three-dimensional mechanical numerical model.

[0058] In the present invention, the production data at least includes: liquid production, oil production, water content and production time.

[0059] In the present invention, the method for establishing a current three-dimensional mechanical numerical model based on the production data and the original three-dimensional mechanical numerical model includes: inputting the production data into the original three-dimensional mechanical numerical model to obtain the current pore pressure, dynamic elastic parameters, static elastic parameters and geostress parameters of the target block; and establishing the current three-dimensional mechanical numerical model based on the pore pressure, dynamic elastic parameters, static elastic parameters and geostress parameters.

[0060] In an embodiment of the present invention, the production data such as the liquid production, oil production, water content and production time of each well a1, a2...an in the target block are input into the original three-dimensional mechanical numerical model, and the current pore pressure, dynamic elastic parameters, static elastic parameters and ground stress parameters are obtained through production history fitting and ground stress evolution calculation. According to the pore pressure, dynamic elastic parameters, static elastic parameters and ground stress parameters, the current three-dimensional mechanical numerical model of the target block is established.

[0061] Step S03: According to the wellbore structure data and the current three-dimensional mechanical numerical model, the refracturing segments corresponding to each well in the target block are determined respectively, and a refracturing numerical model is generated.

[0062] In the present invention, the wellbore structure data at least includes: well casing data, oil pipe data and perforation completion data.

[0063] In the present invention, the method for generating a repeated fracturing numerical model by respectively determining the repeated fracturing segments corresponding to each well in the target block based on the wellbore structure data and the current three-dimensional mechanical numerical model comprises: inputting the wellbore structure data into the current three-dimensional mechanical numerical model, determining the repeated fracturing segments corresponding to each well in the target block based on the reservoir quality, and obtaining the repeated fracturing numerical model.

[0064] In the embodiment of the present invention, the casing data, tubing data and perforation completion data of each well a1, a2...an are input into the current three-dimensional mechanical numerical model, and the repeated fracturing segmentation of each well a1, a2...an is optimized according to the reservoir quality and completion quality, that is, the repeated fracturing segmentation of wells a1, a2...an is: (a1 第1段 、a1 第2段 …a1 第n段 )、(a2 第1段 、a2 第2段 …a2 第n段 )…(an 第1段 、an 第2段 …an 第n段 ). Among them, reservoir quality at least includes: reservoir development thickness, interlayer thickness, reservoir permeability and oil saturation.

[0065] Among them, the repeated fracturing segments corresponding to each well in the target block are determined according to the reservoir quality: the interlayer thickness is less than 2m and the reservoir permeability is similar, such as the difference is less than 10mD, which is divided into one fracturing section, and the interlayer thickness is greater than 2m is fractured separately as much as possible, and the oil saturation is lower than the predetermined value, such as 20%, is not set as a fracturing section.

[0066] Step S04: setting a number of pumping programs, and determining the re-fracturing volume corresponding to each pumping program of each well according to the pumping programs and the re-fracturing numerical model.

[0067] In the present invention, a method for determining the re-fracturing transformation volume corresponding to each pumping program of each well according to the pumping program and the re-fracturing numerical model comprises: inputting each pumping program into the re-fracturing numerical model respectively, and obtaining the artificial fracture length, fracture height and fracture width of each fracturing section corresponding to each pumping program of each well respectively; determining the re-fracturing transformation volume of each fracturing section corresponding to each pumping program of each well according to the artificial fracture length, fracture height and fracture width; and adding up the re-fracturing transformation volumes of all fracturing sections corresponding to each pumping program of each well respectively, to obtain the re-fracturing transformation volume corresponding to each pumping program of each well.

[0068] In the embodiment of the present invention, based on the repeated fracturing segmentation of the repeated fracturing numerical model of the target block a1, a2...an wells, several pumping programs (Scheme 1, Scheme 2...Scheme n) are designed for each well, wherein the pumping program design can set the proppant dosage and fracturing fluid dosage within a reasonable range according to the transformation requirements and investment costs. For example, Scheme 1 corresponding to each segment of the a1, a2...an wells is (P a1第1段 , P a1第2段 …P a1第n段 )、(P a2第1段 , P a2第2段 …P a2第n段 )…(P an第1段 , P an第2段 …P an第n段 ).

[0069] The pumping program 1 corresponding to wells a1, a2 ... an is input into the repeated fracturing numerical model, and the artificial fracture length, fracture height and fracture width of each fracturing section corresponding to the pumping program 1 of wells a1, a2 ... an are obtained by running the model.

[0070] According to the length, height and width of artificial fractures in each fracturing stage of the pumping procedure 1 corresponding to wells a1, a2…an, the repeated fracturing reconstruction volume (a1 第1段SRV 、a1 第2段SRV …a1 第n段SRV )、(a2 第1段SRV 、a2 第2段SRV …a2 第n段SRV )…(an 第1段SRV 、an 第2段SRV …an 第n段SRV ).

[0071] The repeated fracturing reconstruction volume of each section of the pumping procedure 1 of each well (a1, a2...an well) is added together to obtain the repeated fracturing reconstruction volume corresponding to the pumping procedure 1 of each well, that is, a1 SRV方案1 =(a1 第1段SRV +a1 第2段SRV +…+a1 第n段SRV ), a 2SRV方案1 =(a2 第1段SRV +a2 第2段SRV +…+a2 第n段SRV )…an SRV方案1 =(an 第1段SRV +an 第2段SRV +…+an 第n段SRV ).

[0072] Similarly, the repeated fracturing reconstruction volume (a1, a2, ... an well) corresponding to each pumping program (scheme 1, scheme 2, ... scheme n) of each well (a1, a2, ... an well) is calculated. SRV方案1 、a1 SRV方案2 ,…a1 SRV方案n )、(a2 SRV方案1 、a2 SRV方案2 ,…a2 SRV方案n ),…(an SRV方案1 、an SRV方案2 、…an SRV方案n ).

[0073] Step S05: predicting the production of each pumping procedure of each well according to the repeated fracturing reconstruction volume, and drawing a post-fracturing capacity curve, and determining the optimal repeated fracturing design corresponding to each well according to the post-fracturing capacity curve.

[0074] In the present invention, the production of each pumping procedure of each well is predicted respectively, including: predicting the production of each pumping procedure of each well one month, three months, twelve months and twenty-four months after repeated fracturing according to the repeated fracturing reconstruction volume.

[0075] In the embodiment of the present invention, the repeated fracturing transformation volume (a1) corresponding to each pumping program (scheme 1, scheme 2...scheme n) of each well (a1, a2...an well) in the target block is calculated. SRV方案1 、a1 SRV方案2 ,…a1 SRV方案n )、(a2 SRV方案1 、a2 SRV方案2 ,…a2 SRV方案n ),…(an SRV方案1 、an SRV方案2 、…an SRV方案n ) are imported into the reservoir numerical simulator, run the reservoir numerical simulator, and calculate the production after repeated fracturing corresponding to each pumping program (Scheme 1, Scheme 2...Scheme n) of each well (a1, a2...an well) in the target block, that is, the production after repeated fracturing for one month [(Q oa1一个月方案1 , Q oa2一个月方案1 ,…Q oan一个月方案1 ), three months of production (Q oa1三个月方案1 , Q oa2三个月方案1 ,…Q oan三个月方案1 ), twelve months of production (Q oa1十二个月方案1 , Q oa2十二个月方案1 ,…Q oan十二个月方案1 ), the output of the twenty-four months (Q oa1二十四个月方案1 , Q oa2二十四个月方案1 ,…Q oan二十四个月方案1 )]、[(Q oa1一个月方案2 , Q oa2一个月方案2 ,…Qoan一个月方案2 ), three months of production (Q oa1三个月方案2 , Q oa2三个月方案2 ,…Q oan三个月方案2 ), twelve months of production (Q oa1十二个月方案2 , Q oa2十二个月方案2 ,…Q oan十二个月方案2 ), the output of the twenty-four months (Q oa1二十四个月方案2 , Q oa2二十四个月方案2 ,…Q oan二十四个月方案2 )]…[(Q oa1一个月方案n , Q oa2一个月方案n ,…Q oan一个月方案n ), three months of production (Q oa1三个月方案n , Q oa2三个月方案n ,…Q oan三个月方案n ), twelve months of production (Q oa1十二个月方案n , Q oa2十二个月方案n ,…Q oan十二个月方案n ), the output of the twenty-four months (Q oa1二十四个月方案n , Q oa2二十四个月方案n ,…Q oan二十四个月方案n )].

[0076] According to the production, the post-pressure capacity curve (P Ca1方案1 , P Ca1方案2 …P Ca1方案n )、(P Ca2方案1 , P Ca2方案2 …P Ca2方案n )…(P Can方案1 , P Can方案2 …P Can方案n ).

[0077] In the present invention, the method for determining the optimal repeated fracturing design corresponding to each well according to the post-fracturing capacity curve includes: among all the post-fracturing capacity curves corresponding to each well, finding the curve with the highest production value corresponding to the inflection point position as the optimal curve; if there are multiple curves with the same production values ​​corresponding to the inflection points, then selecting the curve with the longest corresponding time of the inflection point as the optimal curve, and the pumping program corresponding to the optimal curve is the optimal repeated fracturing scheme of the well; and compiling the optimal repeated fracturing design of the corresponding well according to the optimal repeated fracturing scheme.

[0078] In the embodiment of the present invention, the y-axis of the post-fracturing capacity curve is the oil production value, and the x-axis is the time. The higher the oil production corresponding to the inflection point of the post-fracturing capacity curve, the better the effect of the pumping program corresponding to the post-fracturing capacity curve. When there are two or more post-fracturing capacity curves with the same oil production value corresponding to the inflection point of a well, the curve with the largest time value on the x-axis corresponding to the inflection point is selected as the optimal curve. The repeated fracturing design during specific construction is compiled according to the pumping program corresponding to the optimal curve.

[0079] In the embodiment of the present invention, taking the well 11Y43-D53 in block A as an example, the specific steps are as follows:

[0080] Step S01: Obtain the single-well horizontal and vertical coordinate data, single-well trajectory data, single-well GR and resistivity logging data of well 11Y43-D53 and adjacent wells a1, a2, a3, and a4 in block A, import them into numerical simulation software, and establish a well group numerical model;

[0081] Obtain geological stratification data, lithology data, and fault data of Block A, import them into numerical simulation software, and establish a stratified structural numerical model;

[0082] Obtain the oil, gas, water saturation, permeability, and porosity data of Block A, import them into numerical simulation software, and establish a numerical model of the attributes;

[0083] The well group numerical model, layered structure numerical model, and attribute numerical model are coupled and calculated to form the three-dimensional geological numerical model of well 11Y43-D53 in block A. 地质 .

[0084] Acquire the acoustic wave and density single well logging data of Block A 11Y43-D53 and adjacent wells a1, a2, a3, and a4;

[0085] Quality control was performed on the acoustic and density logging data, and after quality control, the corresponding numerical models of the well group 11Y43-D53 and the adjacent wells a1, a2, a3, and a4 were inserted;

[0086] The overlying formation pressure, pore pressure, dynamic elastic parameters, static elastic modulus parameters, and geostress parameters of Block A 11Y43-D53 and adjacent wells a1, a2, a3, and a4 were calculated respectively. Based on the above parameters, the original one-dimensional mechanical numerical model of Block A 11Y43-D53 well and adjacent wells a1, a2, a3, and a4 was established;

[0087] Set boundary conditions and create three-dimensional density bodies and acoustic wave bodies;

[0088] The three-dimensional density body and the acoustic wave body are input into the original one-dimensional mechanical numerical model to establish the original three-dimensional mechanical numerical model A 原始力学 .

[0089] Step S02: Obtain the production data of block A 11Y43-D53 and adjacent wells a1, a2, a3, and a4 from the time of commissioning to the present, including liquid production, oil production, water content, production time, etc.;

[0090] Input the production data of Block A 11Y43-D53 and adjacent wells a1, a2, a3, and a4 into A 原始力学 In the process, the current pore pressure, dynamic elastic parameters, static elastic parameters, and geostress parameters are obtained through production history fitting and geostress evolution calculation. Based on the above parameters, the current three-dimensional mechanical numerical model A of Block A is established. 现今力学 .

[0091] Step S03: Acquire casing data, tubing data, perforation and completion data of well 11Y43-D53 in block A;

[0092] Input the casing data, tubing data, perforation and completion data of well 11Y43-D53 in block A into A 现今力学 According to the reservoir quality of Well 11Y43-D53, the repeated fracturing stages of Well 11Y43-D53 were optimized. The repeated fracturing stages of Well 11Y43-D53 were 11Y43-D53. 第1段 、11Y43-D53 第2段 、11Y43-D53 第3段 A refracturing numerical model is generated based on the obtained refracturing segments.

[0093] Step S04: according to the repeated fracturing stages of the 11Y43-D53 well, three pumping programs (Scheme 1, Scheme 2, Scheme 3) are set respectively;

[0094] Pump the well 11Y43-D53 according to Scheme 1. 第1段 、P11Y43-D53 第2段 、P11Y43-D53 第3段 Input the refracturing numerical model;

[0095] Run the pumping program P11Y43-D53 of the plan 1 of the 11Y43-D53 well respectively 第1段 、P11Y43-D53 第2段 、P11Y43-D53 第3段 ;

[0096] The artificial fracture length, fracture height and fracture width corresponding to the first, second and third fracturing stages of Well 11Y43-D53 under Scheme 1 were obtained respectively;

[0097] According to the length, height and width of artificial fractures in the first, second and third sections of Scheme 1 of Well 11Y43-D53, the repeated fracturing reconstruction volume of the first, second and third sections of Scheme 1 of Well 11Y43-D53 is calculated. 第1段SRV 、11Y43-D53 第2段SRV 、11Y43-D53 第n段SRV ;

[0098] Calculate the re-fracture stimulation volume of Scheme 1 for well 11Y43-D53, i.e. SRV方案1 =(11Y43-D53 第1段SRV +11Y43-D53 第2段SRV +11Y43-D53 第3段SRV );

[0099] Repeat the above process to obtain the repeated fracturing transformation volume 11Y43-D53 of Scheme 1, Scheme 2, and Scheme 3 of Well 11Y43-D53 respectively. SRV方案1 、11Y43-D53 SRV方案2 、11Y43-D53 SRV方案3 .

[0100] Step S05: Repeat the fracturing reconstruction volume 11Y43-D53 of the well 11Y43-D53 in Block A in Scheme 1, Scheme 2, and Scheme 3. SRV方案1 、11Y43-D53 SRV方案2 、11Y43-D53 SRV方案3 , respectively imported into the reservoir numerical simulator;

[0101] Run the reservoir numerical simulator to calculate the production (Q) of Well 11Y43-D53 in Block A for Scheme 1, Scheme 2, and Scheme 3 after repeated fracturing for one month. o11Y43-D53一个月方案1 , Q o11Y43-D53一个月方案2 , Q o11Y43-D53一个月方案3 ), three months of production (Q o11Y43-D53三个月方案1 , Q o11Y43-D53三个月方案2 , Q o11Y43-D53三个月方案3 ), twelve months of production (Q o11Y43-D53十二个月方案1 , Q o11Y43-D53十二个月方案2 , Q o11Y43-D53十二个月方案3 ), twenty-four months of production (Q o11Y43-D53二十四个月方案1 , Q o11Y43-D53二十四个月方案2 , Q o11Y43-D53二十四个月方案3 );

[0102] According to the production, the post-pressure capacity curve PC of Scheme 1, Scheme 2 and Scheme 3 of Well 11Y43-D53 in Block A is drawn. 11Y43-D53方案1 、PC 11Y43-D53方案2 、PC 11Y43-D53方案3 ; The specific results of the post-compression capacity curve are as follows Figure 2 shown.

[0103] Find the inflection point of the post-pressure production curve of well 11Y43-D53 and determine that the optimal curve is PC 11Y43-D53方案1 , and its corresponding optimal repeated fracturing scheme is scheme 1;

[0104] According to Scheme 1, a repeated fracturing design for well 11Y43-D53 was prepared.

[0105] It can be understood that the above-mentioned various method embodiments mentioned in the present invention can be combined with each other to form a combined embodiment without violating the principle logic. Due to space limitations, the present invention will not go into details.

[0106] The execution subject of the repeated fracturing optimization design method based on the current three-dimensional mechanical model can be a repeated fracturing optimization design device based on the three-dimensional mechanical model. For example, the repeated fracturing optimization design method based on the current three-dimensional mechanical model can be executed by a terminal device or a server or other processing device, wherein the terminal device can be a user equipment (User Equipment, UE), a mobile device, a user terminal, a terminal, a cellular phone, a cordless phone, a personal digital assistant (Personal Digital Assistant, PDA), a handheld device, a computing device, a vehicle-mounted device, a wearable device, etc. In some possible implementations, the repeated fracturing optimization design method based on the current three-dimensional mechanical model can be implemented by a processor calling a computer-readable instruction stored in a memory.

[0107] Those skilled in the art will appreciate that, in the above method of specific implementation, the order in which the steps are written does not imply a strict execution order and does not constitute any limitation on the implementation process. The specific execution order of the steps should be determined by their functions and possible internal logic.

[0108] The embodiment of the present invention also provides a repeated fracturing optimization design device based on the current three-dimensional mechanical model, including: an acquisition unit, used to acquire the production data of the target block, the wellbore structure data and the original three-dimensional mechanical numerical model; a current three-dimensional mechanical model establishment unit, used to establish the current three-dimensional mechanical numerical model according to the production data and the original three-dimensional mechanical numerical model; a repeated fracturing model establishment unit, used to determine the repeated fracturing segments corresponding to each well in the target block according to the wellbore structure data and the current three-dimensional mechanical numerical model, and generate a repeated fracturing numerical model; a repeated fracturing transformation volume determination unit, used to set a number of pumping programs, and determine the repeated fracturing transformation volume corresponding to each pumping program of each well according to the pumping programs and the repeated fracturing numerical model; an optimal repeated fracturing design unit, used to predict the production corresponding to each pumping program of each well according to the repeated fracturing transformation volume, and draw a post-fracturing capacity curve, and determine the optimal repeated fracturing design corresponding to each well according to the post-fracturing capacity curve.

[0109] In some embodiments, the functions or modules and units included in the device provided by the embodiment of the present invention can be used to execute the method described in the above method embodiment. Its specific implementation can refer to the description of the above method embodiment. For the sake of brevity, it will not be repeated here.

[0110] The present invention solves the practical problem that the existing repeated fracturing optimization design method does not take into account the dynamic changes in the seepage field, pressure field and stress field of the reservoir as the oil field is developed, and the crack initiation and extension law changes accordingly, resulting in the repeated fracturing optimization design being not targeted. The present invention establishes an integrated repeated fracturing numerical model for reservoir engineering based on the current three-dimensional mechanical numerical model, improves the targetedness of the repeated fracturing optimization design, and provides technical support for the precise potential of the remaining oil in old wells. The method has the advantages of strong controllability, convenient and simple operation, safety and effectiveness, and has strong promotion value.

[0111] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A repeated fracturing optimization design method based on the current three-dimensional mechanical model, characterized in that: include: Obtain production data of the target block, wellbore structure data and original three-dimensional mechanical numerical model; Establishing a current three-dimensional mechanical numerical model based on the production data and the original three-dimensional mechanical numerical model; According to the wellbore structure data and the current three-dimensional mechanical numerical model, respectively determine the refracturing segments corresponding to each well in the target block, and generate a refracturing numerical model; Setting a number of pumping programs, and determining the re-fracturing reconstruction volume corresponding to each pumping program of each well according to the pumping programs and the re-fracturing numerical model; According to the repeated fracturing reconstruction volume, the production corresponding to each pumping procedure of each well is predicted respectively, and a post-fracturing capacity curve is drawn. According to the post-fracturing capacity curve, the optimal repeated fracturing design corresponding to each well is determined respectively.

2. The repeated fracturing optimization design method based on the current three-dimensional mechanical model according to claim 1 is characterized in that: Before obtaining the original three-dimensional mechanical numerical model of the target block, an original three-dimensional mechanical numerical model is established, and the method includes: Establish well group numerical model, layered structure numerical model and attribute numerical model respectively; A three-dimensional geological numerical model is established based on the well group numerical model, the layered structure numerical model, and the attribute numerical model; According to the three-dimensional geological numerical model, an original one-dimensional mechanical numerical model is established; Boundary conditions are set, a three-dimensional density body and an acoustic wave body are established, and an original three-dimensional mechanical numerical model is established based on the boundary conditions, the three-dimensional density body, the acoustic wave body and the original one-dimensional mechanical numerical model.

3. The repeated fracturing optimization design method based on the current three-dimensional mechanical model according to claim 1 is characterized in that: The production data at least include: liquid production, oil production, water content and production time.

4. The repeated fracturing optimization design method based on the current three-dimensional mechanical model according to claim 1 is characterized in that: The method for establishing a current three-dimensional mechanical numerical model based on the production data and the original three-dimensional mechanical numerical model comprises: Inputting the production data into the original three-dimensional mechanical numerical model to obtain the current pore pressure, dynamic elastic parameters, static elastic parameters and ground stress parameters of the target block; According to the pore pressure, dynamic elastic parameters, static elastic parameters and ground stress parameters, a current three-dimensional mechanical numerical model is established.

5. The repeated fracturing optimization design method based on the current three-dimensional mechanical model according to claim 1 is characterized in that: The wellbore structure data at least includes: well casing data, oil pipe data and perforation completion data.

6. The repeated fracturing optimization design method based on the current three-dimensional mechanical model according to claim 1 is characterized in that: The method of determining the refracturing segments corresponding to each well in the target block according to the wellbore structure data and the current three-dimensional mechanical numerical model and generating the refracturing numerical model comprises: The wellbore structure data is input into the current three-dimensional mechanical numerical model, and the refracturing segment corresponding to each well in the target block is determined according to the quality to obtain a refracturing numerical model.

7. The repeated fracturing optimization design method based on the current three-dimensional mechanical model according to claim 1 is characterized in that: The method for determining the re-fracturing reconstruction volume corresponding to each pumping program of each well according to the pumping program and the re-fracturing numerical model comprises: Inputting each pumping program into the repeated fracturing numerical model respectively, and obtaining the artificial fracture length, fracture height and fracture width of each fracturing section corresponding to each pumping program of each well respectively; According to the artificial fracture length, fracture height and fracture width, respectively determine the repeated fracturing reconstruction volume of each fracturing stage corresponding to each pumping procedure of each well; The re-fracturing reconstruction volumes of all fracturing stages corresponding to each pumping procedure of each well are added together to obtain the re-fracturing reconstruction volume corresponding to each pumping procedure of each well.

8. The repeated fracturing optimization design method based on the current three-dimensional mechanical model according to claim 1 is characterized in that: The method of predicting the production of each pumping program of each well includes: Based on the re-fracturing stimulation volume, the production of each well corresponding to each pumping procedure is predicted one month, three months, twelve months and twenty-four months after re-fracturing.

9. The repeated fracturing optimization design method based on the current three-dimensional mechanical model according to claim 1 is characterized in that: The method for determining the optimal repeated fracturing design corresponding to each well according to the post-fracturing capacity curve includes: Among all the post-pressure production curves corresponding to each well, the curve with the highest production value corresponding to the inflection point is the optimal curve; If there are multiple curves with the same production value corresponding to the inflection points, the curve with the shortest inflection point corresponding time is selected as the optimal curve, and the pumping program corresponding to the optimal curve is the optimal repeated fracturing program for the well; According to the optimal re-fracturing scheme, an optimal re-fracturing design for the corresponding well is prepared.

10. A repeated fracturing optimization design device based on the current three-dimensional mechanical model, characterized in that: include: An acquisition unit is used to acquire production data of the target block, wellbore structure data and original three-dimensional mechanical numerical model; A current three-dimensional mechanical model building unit, used to build a current three-dimensional mechanical numerical model according to the production data and the original three-dimensional mechanical numerical model; A re-fracturing model building unit, for determining the re-fracturing segment corresponding to each well in the target block according to the wellbore structure data and the current three-dimensional mechanical numerical model, and generating a re-fracturing numerical model; A re-fracturing reconstruction volume determination unit is used to set a plurality of pumping programs, and determine the re-fracturing reconstruction volume corresponding to each pumping program of each well according to the pumping programs and the re-fracturing numerical model; The optimal repeated fracturing design unit is used to predict the production corresponding to each pumping procedure of each well according to the repeated fracturing reconstruction volume, and draw a post-fracturing capacity curve, and determine the optimal repeated fracturing design corresponding to each well according to the post-fracturing capacity curve.

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