Leakage-proof plugging material matching method and system for complex fractured stratum

Abstract

The invention discloses a matching method and system for leakage-proof plugging materials of a complex fractured stratum. The matching method comprises the following steps: firstly, constructing a particle size-particle volume ratio curve model according to leakage-proof plugging materials with different particle sizes in a preset plugging formula; and then matching and fitting the particle size-particle volume ratio curve model and a to-be-plugged stratum crack width-crack volume curve model, and when the goodness of fit value is greater than a preset threshold value, completing the matching process of the leakage-proof plugging material of the complex crack stratum. Wherein the to-be-plugged formation fracture width-fracture volume curve model is pre-constructed through different formation fracture leakage instantaneous speeds. According to the method, one-to-one matching of the formation cracks and the plugging agent particles is achieved, a stable packing layer is formed during plugging, leakage is effectively prevented, the plugging effect of the plugging agent is improved, and the plugging cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of gas well exploration, development and production, and relates to a method and system for matching leak-proof and plugging materials in complex fractured formations. Background Art

[0002] Lost circulation is a common problem in oil and gas exploration and development. Drilling fluid loss occurs in all types of formations, impacting drilling speed and increasing drilling fluid costs. Lost circulation is categorized into four types based on the leakage path: permeability, fracture, cavitation, and fracture. Fracture and cavitation are the most serious.

[0003] During exploration and development drilling and completion operations, fluid loss not only increases costs but also compromises drilling objectives. Consequently, experts and scholars at home and abroad have conducted extensive research on plugging technologies. With the continuous advancement of plugging technology, the range of plugging materials has also expanded. Commonly used plugging agents include bridging plugging agents, chemical plugging agents, and soft and hard plugging agents. However, traditional plugging materials have inherent shortcomings in addressing leakage. The scale and gradation of plugging materials in leakage channels are poor, resulting in large particles easily accumulating and small particles easily dislodging, making it difficult to effectively seal the leakage channels. Consequently, the problem of well leakage remains unresolved. For example, the "Research on New Technologies for Leakage Prevention and Plugging Drilling Fluids" records: Bridging plugging mainly uses a variety of plugging materials to prepare plugging slurry in a certain proportion, and then blocks cracks and pore channels, and plugs the leaking layer through bridging, supporting, connecting, sealing, filling and other functions. The key technology lies in whether the distribution of particle size in the plugging agent matches the diameter of the leakage channel. However, during the drilling process, it is sometimes impossible to accurately grasp the crack width and pore size of the leaking formation, and it is impossible to optimize and determine the formula of the plugging agent, which increases the uncertainty of successful construction and reduces the success rate of plugging.

[0004] Research on plugging agents, both domestically and internationally, has primarily focused on their elasticity, toughness, and temperature resistance. For example, PolyBlock, an expansive plugging material developed by foreign researchers, is a mixture of a specific granular material and a crystalline polymer. It expands upon absorbing water and is suitable for wells with severe loss. It has been used in Egypt's Nile Delta region with excellent plugging results. Zhang Qi'an et al. used acrylamide as a raw material and a hydrophobic organic compound as a crosslinker. They covalently bonded a macromolecular crosslinked network to create an interpenetrating network polymer-based water-swellable material. They then polymerized the granular solid polymer. Finally, they chemically modified its surface with a hydrophobic substance, making it oleophilic and hydrophobic, delaying its expansion time and ensuring the granular material has ample time to enter the leaking zone and continue expanding. The expanded volume can reach 4 to 8 times its original volume upon absorbing water. This plugging agent exhibits strong water-swelling properties, strong mechanical elastic deformation, high plugging strength, high tensile strength, and good compatibility with various water-based drilling fluids. This plugging agent has been applied on-site in Wells C2872, C3002, and H001 of the Cainan Oilfield, achieving excellent plugging results. The above plugging materials have adaptive characteristics during the construction process, and can match the formation leakage channels through downhole cross-linking and expansion.

[0005] However, for the most commonly used bridge plugs for leak prevention and plugging, there has been limited research on the matching design of plugging agents within fractures. The lack of a well-established relationship between fractures and plugging agents has led to blind selection of plugging agents, which cannot be well matched to the leakage path, resulting in poor plugging effectiveness and significantly increased drilling fluid costs. Currently, there are no reported methods for selecting plugging agent particle size grading. For fracture-induced leakage, there is an urgent need for a design and application method for an inert anti-leakage plugging agent that precisely matches the formation fractures. Summary of the Invention

[0006] In response to the problems existing in the prior art, the present invention provides a method and system for matching leak-proof and plugging materials in complex fractured formations, thereby solving the technical problems in the prior art of poor matching between cracks and plugging agents, resulting in poor plugging effects and a significant increase in drilling fluid costs.

[0007] The present invention is achieved through the following technical solutions:

[0008] A method for matching leak-proof and plugging materials in complex fractured formations, comprising the following steps:

[0009] S1: Based on the preset plugging formula, a particle size-particle volume ratio curve model of the leak-proof plugging material is constructed;

[0010] S2: Match and fit the particle size-particle volume ratio curve model with the formation fracture width-fracture volume curve model to be plugged. When the goodness of fit value is greater than a preset threshold, the leak-proof plugging material matching process of the complex fracture formation is completed; wherein, the formation fracture width-fracture volume curve model to be plugged is pre-constructed based on the instantaneous leakage velocity of different formation fractures.

[0011] Preferably, step S1 is specifically:

[0012] S11: Obtaining the particle size data and concentration data of the inert material used for leak prevention and plugging in the block;

[0013] S12: establishing a particle size distribution curve of the leak-proof and plugging particles based on the particle size data and the concentration data;

[0014] S13: According to the plugging formula, the particle size distribution curves of the plurality of plugging materials are synthesized into a plugging curve to obtain the particle size-particle volume ratio curve model.

[0015] Preferably, the process of constructing the formation fracture width-fracture volume curve model to be plugged is:

[0016] S21: Obtain the instantaneous velocity of formation fracture leakage;

[0017] S22: Calculating the width of the fracture at different instantaneous leakage velocities using the instantaneous leakage velocity of the formation fracture;

[0018] S23: Calculating the fracture volume using the fracture width in combination with the fracture height and fracture length, and establishing a fracture width-fracture volume curve model for the formation.

[0019] Preferably, in step S21, the instantaneous velocity of formation fracture leakage during plugging is measured and obtained by using a mud logger or calculated by using liquid level measurement in a large tank.

[0020] Preferably, when the logging recorder is used to measure and obtain the instantaneous velocity of formation fracture leakage during plugging, the recording interval does not exceed 30 minutes.

[0021] Preferably, in step S2, if the goodness of fit value is not greater than the preset threshold, the preset plugging formula is adjusted, and steps S1 to S2 are repeated again until the goodness of fit value is greater than the preset threshold, thereby completing the leak-proof plugging material matching process for the complex fracture formation.

[0022] A leak prevention and plugging material matching system for complex fractured formations, comprising:

[0023] The first data processing unit is used to construct a particle size-particle volume ratio curve model of the leak-proof and plugging material according to a preset plugging formula;

[0024] Second Data Processing Unit: This unit is used to match and fit the particle size-volume curve model with the fracture width-volume curve model for the formation to be plugged. When the goodness of fit exceeds a preset threshold, the leak-proofing and plugging material matching process for the complex fracture formation is complete. The fracture width-volume curve model for the formation to be plugged is pre-constructed based on the instantaneous leakage velocities of different formation fractures.

[0025] A computer device / apparatus / system comprises a memory, a processor and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the above method.

[0026] A computer-readable storage medium stores a computer program, wherein the computer program / instructions are executed by a processor to implement the steps of the above method.

[0027] A computer program product comprises a computer program / instruction, which implements the steps of the above method when executed by a processor.

[0028] Compared with the prior art, the present invention has the following beneficial technical effects:

[0029] The present invention discloses a method for matching leak-proof and plugging materials for complex fractured formations. The method first constructs a particle size-volume ratio curve model based on different particle size leak-proof and plugging materials in a preset plugging formula. Then, the particle size-volume ratio curve model is matched and fitted with a formation fracture width-volume curve model to be plugged. When the goodness of fit exceeds a preset threshold, the leak-proof and plugging material matching process for the complex fractured formation is completed. The formation fracture width-volume curve model to be plugged is pre-constructed based on the instantaneous leakage velocities of different formation fractures. The formation fracture data is a curve model, and the plugging particles of different plugging agent compositions are also curve models. The present invention matches and fits the two curve models. For accurate matching, the goodness of fit value of the two curves is required to be greater than a preset threshold. That is, each fracture width is bridged by a corresponding plugging particle, resulting in a denser plugging layer that is more likely to plug leakage. This achieves a one-to-one match between the formation fractures and the plugging agent particles, forming a stable plugging layer during plugging, effectively preventing leakage, improving the plugging effect of the plugging agent, and reducing the plugging cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 A schematic flow chart of a method for matching leak-proof and plugging materials for complex fractured formations according to the present invention;

[0032] Figure 2 This is a structural schematic diagram of a leak-proof and plugging material matching system for complex fractured formations in the present invention;

[0033] Figure 3 is the instantaneous velocity of the loss recorded in Example 2 of the present invention;

[0034] Figure 4 is the crack width and volume obtained in Example 2 of the present invention;

[0035] Figure 5 is the particle size distribution curve of a single plugging material (GFD-D) in Example 2 of the present invention;

[0036] Figure 6 This is the matching situation of the plugging curve and the crack curve when GFD-D:GFD-C=1:1 in Example 2 of the present invention;

[0037] Figure 7 This is the matching situation of the plugging curve and the crack curve when GFD-D:GFD-C:YX-1:YX-2=1:0.5:0.5:1 in Example 2 of the present invention. DETAILED DESCRIPTION

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0039] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0040] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0041] In the description of the embodiments of the present invention, it should be noted that if the terms "upper," "lower," "horizontal," "inner," etc. appear, the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the inventive product is typically placed when in use. These terms are merely for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first," "second," etc. are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0042] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0043] In the description of the embodiments of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0044] The present invention is described in further detail below with reference to the accompanying drawings:

[0045] Working fluid loss during drilling and completion has a significant impact on drilling and completion operations. Most approaches to address lost circulation include stop-the-drilling plugging and while-drilling (LWD) prevention. The plugging materials used are mostly inert granular materials. Granular materials of varying grades bridge and fill fractures, forming a stable fill layer that prevents drilling fluid loss. This method is known as bridge plugging. The key to bridge plugging is precisely matching the appropriate bridging and filling particles to the formation fractures. However, current technological limitations make it difficult to theoretically design leak-proof materials. First, formation fractures are diverse in morphology. A single fracture can have varying widths at different well depths, making it difficult to calculate the optimal fracture width for the leak-proof material. Second, matching models are complex to establish. Bridge plugging requires inert particles of varying sizes, making them difficult to quantify using parameter alignment. These two factors mean that the design of leak-proof materials for complex fractured formations relies solely on empirical experience or by matching the maximum particle size to the maximum formation fracture size, failing to accurately match small particles to small fractures.

[0046] To this end, the purpose of the present invention is to provide a design method for an inert leak-proof plugging agent for drilling and completion that is precisely matched to complex fractured formations. Starting from formation leakage, the formation fractures are identified, the maximum fracture width and the fracture width combination curve are determined, and then the plugging agent is subjected to a particle size test. An accurate matching mode is established to precisely match the bridging particles and the filling particles in a full-size series, thereby improving the design and construction method of the leak-proof plugging agent for complex fractures, guiding the leak-proof plugging construction of fractured formations, and improving the construction effect.

[0047] Example 1

[0048] like Figure 1 As shown, the present invention discloses a method for matching leak-proof and plugging materials in complex fractured formations, comprising the following steps:

[0049] S1: Based on the preset plugging formula, a particle size-particle volume ratio curve model of the leak-proof plugging material is constructed;

[0050] The above-mentioned particle size-particle volume ratio curve model is constructed as follows:

[0051] S11: Obtain the particle size data and concentration data of the inert material used for leak prevention and plugging in the block; here, the particle size and concentration of each material can be analyzed using equipment such as a laser particle size analyzer; in the cracks, the supporting particles that play a bridging and filling role are mainly inert granular plugging agents. Therefore, in designing the plugging formula, mainly inert granular plugging agents are collected.

[0052] S12: Establish the particle size concentration distribution curve and cumulative distribution curve of the leak-proof and plugging particles based on the particle size data and concentration data; this step can be made using Excel or other drawing software; here, if the formation fracture width-fracture volume curve can be matched with the formation fracture width-fracture volume cumulative curve, it is necessary to obtain the particle size-particle volume ratio cumulative curve model

[0053] S13: According to the plugging formula, the particle size concentration curves of the multiple plugging materials are synthesized into a plugging curve to obtain the particle size-particle volume ratio curve model.

[0054] Specifically, the particle size distribution curves of multiple plugging materials are synthesized into a plugging curve by adding up the volumes. For example, if there are 50 kg of plugging material A, 100 kg of plugging material B, and 150 kg of plugging material C, the total mass of the synthesized plugging material is 50+100+150=300 kg, of which 0.001-0.002 mm particles are 0.5 kg, 2.5 kg, and 5.0 kg in A, B, and C, respectively. Then, the concentration of 0.001-0.002 mm particles in the total particles is (0.5+2.5+5.0) / 300=0.0177. By analogy, under the particle size-volume curve of each plugging agent, a particle size-volume curve can be synthesized according to the proportion of each plugging agent in the total plugging agent. See formula (1) for details, that is, according to the plugging agent formula, it is necessary to synthesize the particle size curve of a single plugging agent. For a certain particle size, the volume of the combination under the particle size is calculated using the following formula:

[0055]

[0056] Where: x i -The proportion of particles with a particle size of i in the total plugging agent, where i can represent a certain range, such as 0.001 to 0.002 mm; x i,j - is the proportion of particles with particle size i in the jth plugging agent; j is the volume of the jth plugging agent. n is the number of single plugging agents included in the total plugging agents.

[0057] S2: Match and fit the particle size-particle volume ratio curve model with the formation crack width-crack volume curve model to be plugged. When the goodness of fit value is greater than the preset threshold, the leak-proof plugging material matching process of the complex fracture formation is completed; wherein, the formation crack width-crack volume curve model to be plugged is pre-constructed by the instantaneous leakage rate of different formation cracks. Goodness of Fit here refers to the degree of fit of the regression line to the observed value. The statistic for measuring goodness of fit is the coefficient of determination (also known as the coefficient of determination) R 2 . R 2The maximum value is 1. 2 The closer the value of R2 is to 1, the better the regression line fits the observed values; conversely, the smaller the value of R2, the worse the regression line fits the observed values. In the present invention, a preset threshold is 0.9. That is, when the goodness of fit R2 of the particle size-particle volume fraction curve model and the formation fracture width-fracture volume curve model is greater than 0.9, the particle size-particle volume fraction curve model is considered to overlap with the formation fracture width-fracture volume curve model.

[0058] In this step, the process of constructing the fracture width-fracture volume curve model to be plugged is as follows:

[0059] S21: Obtaining the instantaneous velocity of formation fracture leakage during plugging. Specifically, the instantaneous velocity of formation fracture leakage during plugging can be measured and obtained using a mud logger or calculated using a large tank liquid level meter. When using the mud logger to measure and obtain the instantaneous velocity of formation fracture leakage during plugging, the recording interval should not exceed 30 minutes to avoid missing key data. It is best to record every 10 minutes, and any changes in the leakage velocity must be recorded.

[0060] S22: Calculating the width of the fracture at different instantaneous leakage velocities using the instantaneous leakage velocity of the formation fracture;

[0061] In the calculation of formation fracture width, it is necessary to assume unavailable data such as fracture height and fracture length. This can be calculated based on block drilling experience; other data can be obtained through actual drilling conditions.

[0062] In this step, the instantaneous leakage velocity of the formation fracture is used to calculate the width of the fracture at different instantaneous leakage velocities, specifically:

[0063]

[0064] Where W is the crack height (m), b is the crack width (mm), ρ m is the fluid density (kg / m 3 ), ρ p is the pore pressure equivalent density (kg / m 3 ), g is the acceleration due to gravity (taken as 9.8), H is the well depth (m), μ PV is the fluid viscosity (mPa.s), q is the fluid displacement (m 3 / s), d hole is the outer diameter of the drill pipe (m), d dp is the wellbore diameter (m), L is the fracture depth (m), θ is the fracture inclination (°), d n is the nozzle equivalent diameter (m), R is the wall roughness, Q is the instantaneous leakage velocity obtained on the ground (m 3 / h).

[0065] S23: Calculate the fracture volume using the fracture width in combination with the fracture height and fracture length, and establish the formation fracture width-fracture volume curve model. Specifically, a series of fracture widths are calculated based on the instantaneous velocities, and the fracture width calculation points are plotted in Excel or other mapping software (the horizontal axis is the instantaneous velocity of the fracture loss, and the vertical axis is the fracture width) to obtain a formation fracture width curve;

[0066] The crack space volume can be obtained by calculating the instantaneous crack width × crack width × crack depth.

[0067] Calculate the proportion of the fracture space volume, which is the ratio of the fracture volume at each fracture aperture to the maximum fracture volume.

[0068] In Excel, data points are plotted with the horizontal axis representing the crack width and the vertical axis representing the crack ratio, and the formation crack volume is fitted using an exponential form to obtain a curve with a high correlation. This curve is the formation crack width-crack volume curve model.

[0069] In the above steps, if the particle size-particle volume ratio curve model fits the formation fracture width-fracture volume curve model, and the goodness of fit value is not greater than the preset threshold, that is, the particle size-particle volume ratio curve model differs significantly from the formation fracture width-fracture volume curve model, then the preset plugging formula is adjusted and steps S1 to S2 are repeated again until the particle size-particle volume ratio curve model fits the formation fracture width-fracture volume curve model, and the goodness of fit is greater than the preset threshold, completing the leak-proof plugging material matching process for the complex fracture formation. This step requires multiple adjustments to the plugging agent formula and trial calculations to obtain a good fit.

[0070] In the process of calculating the width of formation fractures, the existing technology generally only focuses on the maximum fracture width or the average fracture width of the formation, so generally a formation loss velocity is used for calculation. According to experience, each formation fracture width corresponds to a set of drilling fluid loss velocities. Since the formation fractures change dynamically during the loss process, only taking a single fracture width cannot represent the original fracture width of the formation. Therefore, in the present invention, as many instantaneous formation loss velocities as possible should be taken to calculate multiple fracture widths and multiple fracture volumes for subsequent precise matching of formation fractures with plugging materials. When matching formation crack widths with plugging particles, the prior art often only focuses on matching the maximum crack width with the largest plugging agent particle. During crack plugging, formation cracks must be matched one-to-one with plugging agent particles to form a stable plugging layer and prevent leakage. Therefore, in the present invention, the formation crack data is a curve, and the plugging particles composed of different plugging agents are also a curve. When the two curves are accurately matched, the goodness of fit is required to be greater than a preset threshold, that is, each crack width has a corresponding plugging particle to bridge, so that the plugging layer formed in this way is more dense and easier to plug leakage. That is, the present invention pays attention to the crack width at the maximum crack opening and also pays attention to the width at each crack opening, making the designed leak-proof and plugging formula more targeted and the evaluation results more reliable.

[0071] In addition, if Figure 2 As shown, the present invention also discloses a leak-proof and plugging material matching system for complex fractured formations, comprising:

[0072] The first data processing unit is used to construct a particle size-particle volume ratio curve model of the leak-proof and plugging material according to a preset plugging formula;

[0073] The second data processing unit: The second data processing unit is used to match and fit the particle size-particle volume ratio curve model with the formation fracture width-crack volume curve model to be plugged. When the fitting goodness value is greater than a preset threshold, the leak-proof plugging material matching process of the complex fracture formation is completed; wherein, the formation fracture width-crack volume curve model to be plugged is pre-constructed through the instantaneous leakage velocity of different formation fractures.

[0074] Example 2

[0075] The oil and gas reservoirs in a certain area are dense, with well-developed cracks and microcracks. Drilling leakage not only increases drilling costs but also causes reservoir damage. Therefore, successfully plugging the formation leakage is of great help to drilling and production. Taking the well plugging in a certain block as an example, the technical solution of the present invention is explained as follows:

[0076] First, obtain the formation loss rate of a well, see Figure 3 .

[0077] 1) Substitute the parameters to calculate the fracture volume under different fracture widths, and use curve fitting to obtain the curve of formation fracture width-fracture volume ratio, see Figure 4 In the figure, the line connecting the blue data points is the calculated crack width-crack volume ratio data, and the red data points are the fitting curves.

[0078] 2) Determine the particle size composition of each plugging agent and draw the particle size distribution curve and cumulative distribution curve, see Figure 5 In the figure, blue is the particle volume distribution curve, and orange is the cumulative distribution curve.

[0079] 3) Select a variety of plugging materials, synthesize the particle size distribution curve of the plugging particles under the plugging formula, and match it with the formation fracture width-fracture volume ratio curve. The results are shown in Figure 6 and Figure 7 .

[0080] Figure 6 The formula for the medium plugging agent is GFD-D:GFD-C = 1:1. As can be seen from the matching diagram, the particle curve differs significantly from the formation fracture curve. The particle size is too large and should be adjusted. GFD-D is a rigid particle plugging agent type D, and GFD is a rigid particle plugging agent type C.

[0081] according to Figure 6 Adjust the plugging agent formula, adjust the proportion of large particles GFD-C, increase the small particle size plugging particles YX-1:YX-2, and adjust the ratio to GFD-D:GFD-C:YX-1:YX-2=1:0.5:0.5:1. Figure 7 It can be seen that after adjusting the formula, the particle size distribution of the formation plugging agent is consistent with the aperture of the formation fracture, and a plugging agent formula with good plugging effect can be obtained.

[0082] In addition, a schematic diagram of a terminal device is provided in one embodiment of the present invention. The terminal device in this embodiment includes: a processor, a memory, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of each of the aforementioned method embodiments are implemented. Alternatively, when the processor executes the computer program, the functions of each module / unit in each of the aforementioned device embodiments are implemented.

[0083] The computer program may be divided into one or more modules / units, which are stored in the memory and executed by the processor to accomplish the present invention.

[0084] The terminal device may be a computing device such as a desktop computer, a notebook computer, a PDA, a cloud server, etc. The terminal device may include, but is not limited to, a processor and a memory.

[0085] The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0086] The memory may be used to store the computer programs and / or modules, and the processor implements various functions of the terminal device by running or executing the computer programs and / or modules stored in the memory and calling the data stored in the memory.

[0087] If the module / unit integrated in the terminal device is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the process in the above-mentioned embodiment method, and can also be completed by a computer program to instruct the relevant hardware. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by a processor, it can implement the steps of each of the above-mentioned method embodiments. The computer program includes computer program code, which can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media does not include electric carrier signals and telecommunication signals.

[0088] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A method for matching leak-proof and plugging materials in complex fractured formations, characterized in that: The following steps are involved: S1: Based on the preset plugging formula, a particle size-particle volume ratio curve model of the leak-proof plugging material is constructed; S2: Match and fit the particle size-particle volume ratio curve model with the formation fracture width-fracture volume curve model to be plugged. When the goodness of fit value is greater than a preset threshold, the leak-proof plugging material matching process of the complex fracture formation is completed; wherein, the formation fracture width-fracture volume curve model to be plugged is pre-constructed based on the instantaneous leakage velocity of different formation fractures.

2. The method for matching leak-proof and plugging materials for complex fractured formations according to claim 1, characterized in that: Step S1 is specifically as follows: S11: Obtaining the particle size data and concentration data of the inert material used for leak prevention and plugging in the block; S12: establishing a particle size distribution curve of the leak-proof and plugging particles based on the particle size data and the concentration data; S13: According to the plugging formula, the particle size distribution curves of the plurality of plugging materials are synthesized into a plugging curve to obtain the particle size-particle volume ratio curve model.

3. The method for matching leak-proof and plugging materials for complex fractured formations according to claim 1, characterized in that: The construction process of the formation fracture width-fracture volume curve model to be plugged is as follows: S21: Obtain the instantaneous velocity of formation fracture leakage; S22: Calculating the width of the fracture at different instantaneous leakage velocities using the instantaneous leakage velocity of the formation fracture; S23: Calculating the fracture volume using the fracture width in combination with the fracture height and fracture length, and establishing a fracture width-fracture volume curve model for the formation.

4. The method for matching leak-proof and plugging materials in complex fractured formations according to claim 3, characterized in that: In step S21, the instantaneous velocity of formation fracture leakage during plugging is measured and obtained by using a mud logger or calculated by using a large tank liquid level meter.

5. The method for matching leak-proof and plugging materials in complex fractured formations according to claim 4, characterized in that: When the logging recorder is used to measure and obtain the instantaneous velocity of formation fracture leakage during plugging, the recording interval shall not exceed 30 minutes.

6. The method for matching leak-proof and plugging materials for complex fractured formations according to claim 1, characterized in that: In step S2, if the goodness of fit value is not greater than the preset threshold, the preset plugging formula is adjusted and steps S1 to S2 are repeated again until the goodness of fit value is greater than the preset threshold, completing the leak-proof plugging material matching process for the complex fracture formation.

7. A leak-proof and plugging material matching system for complex fractured formations, characterized in that: include: The first data processing unit is used to construct a particle size-particle volume ratio curve model of the leak-proof and plugging material according to a preset plugging formula; Second Data Processing Unit: This unit is used to match and fit the particle size-volume curve model with the fracture width-volume curve model for the formation to be plugged. When the goodness of fit exceeds a preset threshold, the leak-proofing and plugging material matching process for the complex fracture formation is complete. The fracture width-volume curve model for the formation to be plugged is pre-constructed based on the instantaneous leakage velocities of different formation fractures.

8. A computer device / apparatus / system comprising a memory, a processor, and a computer program stored in the memory, characterized in that: The processor executes the computer program to implement the steps of the method according to any one of claims 1 to 6.

9. A computer-readable storage medium storing a computer program, characterized in that: When the computer program / instructions are executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

10. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instruction is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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