Drilling plugging material selection method and system, electronic equipment and storage medium

Abstract

The invention belongs to the technical field of well drilling, and particularly relates to a well drilling plugging material selection method and system, electronic equipment and a storage medium. According to the method, the characteristics of diverse leakage types and different leakage stoppage mechanisms of the reservoirs and reservoirs are fully considered, the optimal stoppage efficiency of the stoppage materials for well drilling of the reservoirs is used as an optimal index, the method for selecting the stoppage materials suitable for efficient stoppage of the reservoirs and reservoirs is formed, pertinence is high, the stoppage materials can be effectively optimized, operability is high, repeatability is good, and the method is suitable for being used for efficient stoppage of the reservoirs and reservoirs. Operation is simple and economic cost is low. According to the method, selection of the plugging material is optimized, the plugging effect can be improved, the construction risk can be reduced, the construction cost can be reduced, a scientific basis can be provided for selection of the reservoir plugging material, the method adapts to complex geological conditions, and development of the reservoir drilling plugging technology and improvement of the industry technology level are expected to be promoted.

Description

Technical Field

[0001] The invention belongs to the technical field of drilling, and in particular relates to a method, system, electronic equipment and storage medium for selecting a drilling plugging material. Background Art

[0002] The current selection of plugging materials mainly refers to the industry standard SY / T5840-2007 (Indoor test method for bridging plugging materials for drilling fluids), which is to add plugging materials to the drilling fluid to prepare plugging slurry, select fracture-type fracture modules, and uniformly pressurize the test container, with the maximum pressure-bearing capacity of the plugging as the evaluation index. However, the current plugging material selection method does not consider the reservoir drilling fluid leakage mechanism and plugging mechanical mechanism, resulting in the poor adaptability of the plugging materials selected for evaluation to the reservoir, and the large differences in the field test results.

[0003] There are also methods of selecting plugging materials through modeling in the prior art. For example, a method for selecting plugging materials for drilling and completion in deep fractured formations is proposed in the patent with publication number CN116451612A. In this patent, a physical model of the target area fracture plugging layer is established based on the plugging layer parameters of the target area; then the larger value of the energy dissipation rate of the plugging layer in the positive and reverse pressure-bearing processes is used as the preferred index, and long-term stable plugging materials are selected. However, this method requires the construction of a physical model of the fracture plugging layer, and its construction process involves the acquisition and training of multiple parameters, and its authenticity is inferior to that of actual simulation experiments.

[0004] There is also a patent CN116432399A that discloses an experimental evaluation method for the control efficiency of drilling fluid loss in fractured formations. This method mainly divides drilling fluid loss into three categories based on the causes of loss, and clarifies the main control factors and their weight ratios of different loss types. By comparing the indoor and on-site drilling fluid loss control efficiency fit, the indoor experimental method with the highest fit is selected to evaluate the drilling fluid loss control efficiency of different loss types, and scores are given according to the weight ratio of the main control factors. Finally, the quantitative scoring formula can be used to achieve accurate optimization of the plugging formula and improve the loss control efficiency of the plugging formula. Although this method takes into account the impact of different loss types on plugging, its calculation method is cumbersome and does not take into account actual applications, lacking practicability. Summary of the invention

[0005] In view of the problem that there are many types of plugging materials at present, the selection depends on experience, and the selection of plugging materials lacks basis, the present invention proposes the following solution:

[0006] In a first aspect, the present invention provides a method for selecting a drilling plugging material, comprising the following steps:

[0007] Use the prepared plugging slurry to conduct crack plugging experiments on crack rock samples, and obtain the first data during the crack plugging experiment;

[0008] Determine the type of drilling fluid loss in the target area based on the development of drilling fluid loss fractures in the target area reservoir;

[0009] Determine the second data in the reservoir drilling process according to the actual demand of the drilling operation of the target area reservoir;

[0010] Calculate the optimal plugging efficiency of the target area reservoir drilling plugging material according to the target area reservoir drilling fluid loss type and based on the first data and the second data;

[0011] The plugging material is selected according to the reservoir drilling fluid loss type and the optimal plugging efficiency.

[0012] Furthermore, the first data is the maximum crack plugging strength and the shortest time required for crack plugging during the crack plugging experiment;

[0013] The second data is the maximum fracture plugging strength and the shortest time required for fracture plugging during the actual drilling operation of the target area reservoir.

[0014] Furthermore, the maximum fracture plugging strength is the maximum displacement pressure monitored before fracture plugging fails.

[0015] Furthermore, the shortest time required for crack plugging is the minimum displacement time required after the crack plugging layer has been formed.

[0016] Furthermore, the fractured rock sample is prepared by the following method:

[0017] Based on the engineering geological data of the target area reservoir, determine the development of reservoir drilling fluid leakage fractures;

[0018] According to the development of the leakage fractures, the fracture rock samples for indoor fracture plugging experiments are prepared.

[0019] Furthermore, the fractured rock sample includes an artificial rock core or a natural rock sample.

[0020] Furthermore, the method of performing a crack plugging experiment on a crack rock sample using the prepared plugging slurry and obtaining first data during the crack plugging experiment includes the following steps:

[0021] Inject the prepared plugging slurry into the cracks of the fractured rock sample. During the grouting process, monitor the changes in grouting pressure, record the start and end time of grouting, and calculate the time required for crack plugging.

[0022] After the plugging slurry is completely cured, evaluate the crack sealing strength.

[0023] Further, the determination of the type of drilling fluid loss in the target area reservoir based on the development of drilling fluid loss fractures in the target area reservoir comprises the following steps:

[0024] Collect drilling fluid loss data, reservoir imaging logging data and geological information of the target area reservoir;

[0025] Identify the reservoir's lithology, physical properties and the presence of fractures by analyzing the reservoir's imaging logging data;

[0026] Use geological data to identify the sedimentary phases and lithology of the reservoir in the target area, and observe the development of core fractures in the target area;

[0027] The drilling fluid loss type is determined based on the results of sedimentary phase identification and lithology classification combined with the development of core fractures in the target area and drilling fluid loss data.

[0028] Furthermore, the drilling fluid loss fracture development conditions include fracture occurrence and fracture size;

[0029] The fracture occurrence includes the direction, inclination and dip of the fracture;

[0030] The fracture dimensions include the width, length, depth and volume density of the fracture.

[0031] Furthermore, the drilling fluid loss data includes mud loss layer, loss amount and loss velocity.

[0032] Furthermore, the imaging logging data of the reservoir includes geological exploration reports, logging data, and core analysis data;

[0033] The logging data include natural gamma logging curve, sonic time difference logging curve, density logging curve and resistivity curve.

[0034] Furthermore, the reservoir drilling fluid loss types include induced fracture type loss, fracture extension type loss and large and medium fracture type loss.

[0035] Further, the method of calculating the optimal plugging efficiency of the target area reservoir drilling plugging material according to the target area reservoir drilling fluid loss type and based on the first data and the second data comprises the following steps:

[0036] Determine the fracture plugging strength coefficient and fracture plugging time coefficient according to the drilling fluid loss type of the target reservoir;

[0037] The optimal plugging efficiency of the target area reservoir drilling plugging material is calculated according to the fracture plugging strength coefficient, the fracture plugging time coefficient, the first data and the second data.

[0038] Furthermore, the calculation formula for calculating the optimal plugging efficiency of the target area reservoir drilling plugging material based on the fracture plugging strength coefficient, the fracture plugging time coefficient, the first data and the second data is as follows:

[0039]

[0040] Among them, O pe is the optimal plugging performance of the plugging material, p a is the maximum crack sealing strength in the crack sealing experiment, p b is the shortest time required for crack plugging in the crack plugging experiment, A is the crack plugging strength coefficient, B is the crack plugging time coefficient, and p a-max is the maximum fracture plugging strength during reservoir drilling, p b-min It is the shortest time required to seal fractures during reservoir drilling.

[0041] Furthermore, when the target area reservoir drilling fluid loss type is induced fracture type loss, the fracture plugging strength coefficient and the fracture plugging time coefficient are 0.1 and 0.9 respectively.

[0042] Furthermore, when the target area reservoir drilling fluid loss type is extended leakage, the fracture plugging strength coefficient and the fracture plugging time coefficient are 0.5 and 0.5 respectively.

[0043] Furthermore, when the target area reservoir drilling fluid loss type is large or medium fracture type loss, the fracture plugging strength coefficient and the fracture plugging time coefficient are 0.9 and 0.1 respectively.

[0044] In a second aspect, the present invention provides a system for selecting a well plugging material, comprising:

[0045] A first data acquisition unit is used to perform a crack plugging experiment on the crack rock sample using the prepared plugging slurry, and acquire first data during the crack plugging experiment;

[0046] A drilling fluid loss type determination unit is used to determine the reservoir drilling fluid loss type based on the development of drilling fluid loss fractures in the target area reservoir;

[0047] A second data determination unit, used to determine second data in the reservoir drilling process according to actual requirements of the drilling operation of the target area reservoir;

[0048] An optimal plugging efficiency calculation unit, used to calculate the optimal plugging efficiency of the drilling plugging material of the target area reservoir according to the type of drilling fluid loss in the target area reservoir and based on the first data and the second data;

[0049] The plugging material selection unit is used to select the plugging material according to the reservoir drilling fluid loss type and the optimal plugging efficiency.

[0050] In a third aspect, the present invention provides an electronic device, comprising a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other via the communication bus;

[0051] a memory storing a computer program;

[0052] The processor is used to implement the drilling plugging material selection method when executing the program stored in the memory.

[0053] In a fourth aspect, the present invention proposes a computer-readable storage medium storing a computer program, and when the computer program is run, the method for selecting drilling plugging materials is executed.

[0054] Beneficial effects of the present invention:

[0055] The present invention provides a method for selecting reservoir drilling plugging materials based on the optimal plugging efficiency based on the physical mechanism of reservoir drilling fluid leakage and the mechanical mechanism of drilling plugging, and the theoretical basis is reliable; and the present invention fully considers the characteristics of diverse reservoir leakage types and different plugging mechanisms, and takes the optimal plugging efficiency of reservoir drilling plugging materials as the preferred index, forming a method for selecting plugging materials suitable for efficient plugging of reservoirs, which is highly targeted, can effectively select plugging materials, has strong operability, good repeatability, is easy to operate, and has low economic cost. By optimizing the selection of plugging materials by the above method, the plugging effect can be improved, the construction risk can be reduced, the construction cost can be reduced, and a scientific basis can be provided for the selection of reservoir plugging materials, which can adapt to complex geological conditions and is expected to promote the development of reservoir drilling plugging technology and the improvement of industry technology level.

[0056] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0058] Figure 1 A flow chart showing a method for selecting a drilling plugging material according to an embodiment of the present invention is shown;

[0059] Figure 2 A picture of a plunger fracture rock sample prepared in an embodiment of the present invention is shown;

[0060] Figure 3The indoor crack plugging test curve of the plugging material formula 1 in the embodiment of the present invention is shown;

[0061] Figure 4 The indoor crack plugging test curve of the plugging material formula 2 in the embodiment of the present invention is shown;

[0062] Figure 5 A schematic diagram of a system for selecting a well drilling plugging material is shown in an embodiment of the present invention;

[0063] Figure 6 A schematic diagram of an electronic device proposed in an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0064] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0065] The present invention proposes a method for selecting a drilling plugging material, such as Figure 1 As shown, the following steps are included:

[0066] S1: Based on the engineering geological data of the target area reservoir, determine the development of reservoir drilling fluid leakage fractures, the fracture development conditions including fracture occurrence and fracture size;

[0067] Step S1 specifically includes the following steps:

[0068] S11: Collect drilling fluid loss data and reservoir imaging logging data;

[0069] Specifically, the drilling fluid loss data includes mud loss layer, loss amount and loss velocity, and the reservoir imaging logging data includes geological exploration reports, logging data and core analysis data;

[0070] S12: preparing fracture rock samples for indoor fracture plugging experiments according to the development of the leakage fractures.

[0071] In an exemplary embodiment of the present invention, the logging data may be interpreted to identify reservoir characteristics to determine the presence of fractures, and the target area core may be analyzed to observe the fracture occurrence and the size of the leakage fractures;

[0072] For example, the presence of fractures can be identified by using natural gamma, acoustic wave time difference, density, resistivity and other curves in logging data; combined with core observations, the occurrence of fractures can be determined, including strike, dip and inclination.

[0073] The reservoir characteristics include but are not limited to lithology, porosity, permeability, etc.;

[0074] The fracture occurrence includes the direction, inclination and dip angle of the fracture;

[0075] The fracture dimensions include the width, length, depth and volume density of the fractures; the fracture width can be directly measured on the core, or indirectly calculated using methods such as dual lateral logging and sonic logging in the logging data; the fracture length can be calculated by using the core observation results to statistically calculate the length and spacing of the fractures. For the case where the fracture spacing is greater than the well diameter, the fracture spacing can be estimated by using statistical methods such as the fracture spacing index method. The fracture volume density can be obtained by calculating the total surface area of ​​the fracture and the total volume of the rock based on the intersection relationship between the fracture and the core.

[0076] S2: Prepare fracture rock samples for indoor fracture plugging experiments according to the development of leakage fractures;

[0077] Specifically, an artificial core or a natural rock sample can be selected as the fracture rock sample.

[0078] When selecting artificial cores, during production, it should be ensured that the parameters such as the shape, width and depth of the cracks meet the experimental requirements, and the cracks should be processed, including cleaning impurities on the surface of the cracks, keeping the cracks dry, etc., to ensure the smooth progress of the plugging experiment.

[0079] In some embodiments of the present invention, if a plugging experiment to evaluate the crack depth is required, an ultrasonic method, a chiseling method or other measurement method may be used to determine the crack depth, and a crack of a corresponding depth may be set in the simulation experiment.

[0080] S3: using the prepared plugging slurry to perform a crack plugging experiment on the crack rock sample, and obtaining first data during the crack plugging experiment; the first data is the crack plugging strength and the time required for crack plugging during the crack plugging experiment;

[0081] Exemplarily, the process of the crack sealing experiment is as follows:

[0082] Install the grouting nozzle at one or both ends of the crack, making sure that the grouting nozzle fits tightly against the crack to avoid leakage of grout during the grouting process;

[0083] Connect the grouting equipment to the grouting nozzle, set the grouting pressure and flow parameters. During the experiment, the grouting pressure and flow should be adjusted according to the width and depth of the cracks and the performance of the plugging slurry;

[0084] Start the grouting equipment and inject the plugging slurry into the cracks. During the grouting process, use pressure gauges and other measuring equipment to monitor the changes in grouting pressure, record the start and end time of grouting, and calculate the time required to plug the cracks;

[0085] After plugging is completed, continue to squeeze the plugging slurry and monitor the maximum pressure value during the squeezing process, which is the maximum crack plugging strength of the crack.

[0086] S4: Determine the type of drilling fluid loss in the target area based on the drilling fluid loss and fracture development in the target area reservoir; specifically, the following steps are included:

[0087] Collect drilling fluid loss data, reservoir imaging logging data and geological information of the target area reservoir;

[0088] Identify the reservoir's lithology, physical properties and the presence of fractures by analyzing the reservoir's imaging logging data;

[0089] Use geological data to identify the sedimentary phases and lithology of the reservoir in the target area, and observe the development of core fractures in the target area;

[0090] The drilling fluid loss type is determined based on the results of sedimentary phase identification and lithology classification combined with the development of core fractures in the target area and drilling fluid loss data.

[0091] In some embodiments of the present invention, the reservoir drilling fluid loss type can be divided into underdeveloped fracture reservoir, non-leakage-causing natural fracture reservoir, and developed leakage-causing natural fracture reservoir according to the degree of reservoir fracture development. The drilling fluid loss types corresponding to the above three reservoirs are induced fracture type loss, fracture extension type loss, and large and medium fracture type loss.

[0092] The control mechanism of drilling fluid loss in fractured reservoirs is closely related to the reservoir loss mechanism. For reservoirs with induced fracture-type leakage, the leakage mechanism is the imbalance between the wellbore pressure field and the ground stress field. The key to improving the pressure-bearing capacity of the reservoir is to support the opening of the fracture by forming a fracture sealing layer near the fracture opening, thereby increasing the fracture pressure of the reservoir ("stress cage" and increasing the fracture closure stress method).

[0093] The cause of reservoir leakage of fracture extension type is the imbalance between the wellbore pressure field and the stress field at the fracture tip. For this type of reservoir leakage, forming a fracture plugging layer in the fracture to isolate the fracture tip and increase the fracture extension pressure is the key to its leakage control (increasing fracture extension pressure method).

[0094] The main leakage mechanism of reservoirs with large and medium fractures is the imbalance between the wellbore pressure field and the reservoir pressure field. In order to improve the pressure-bearing capacity of this type of leakage reservoir, it is necessary to add plugging materials to the drilling fluid to plug the cracks. The fracture plugging layer formed in the cracks blocks the transmission between the wellbore pressure and the reservoir pressure (plugging the leakage channel method).

[0095] S5: determining second data in the reservoir drilling process according to actual requirements of the drilling operation of the target area reservoir;

[0096] Specifically, the second data is the maximum fracture plugging strength and the shortest time required for fracture plugging during the actual drilling operation of the target area reservoir.

[0097] S6: Calculating the optimal plugging efficiency of the target area reservoir drilling plugging material according to the target area reservoir drilling fluid loss type and based on the first data and the second data; specifically comprising the following steps:

[0098] Determine the fracture plugging strength coefficient and fracture plugging time coefficient according to the drilling fluid loss type of the target reservoir;

[0099] The optimal plugging efficiency of the target area reservoir drilling plugging material is calculated based on the fracture plugging strength coefficient, the fracture plugging time coefficient, the first data, and the second data. The calculation formula is as follows:

[0100]

[0101] Among them, O pe is the optimal plugging performance of the plugging material, p a is the maximum crack sealing strength in the crack sealing experiment, p b is the shortest time required for crack plugging in the crack plugging experiment, A is the crack plugging strength coefficient, B is the crack plugging time coefficient, and p a-max is the maximum fracture plugging strength during reservoir drilling, p b-min It is the shortest time required to seal fractures during reservoir drilling.

[0102] In some exemplary embodiments of the present invention, for induced fracture type well leakage, A and B are taken as 0.1 and 0.9 respectively; for extended extension type well leakage, A and B are taken as 0.5 and 0.5 respectively; for large and medium fracture type well leakage, A and B are taken as 0.9 and 0.1 respectively.

[0103] S7: Selecting plugging materials according to the reservoir drilling fluid loss type and the optimal plugging efficiency.

[0104] Under clear evaluation criteria (taking the optimal plugging efficiency of reservoir drilling plugging materials as the evaluation criteria), the plugging agent with the best plugging efficiency is selected for practical application.

[0105] In order to verify the reliability of the above method in practical application, taking a reservoir in a certain basin as an example, two physical plugging materials commonly used in plugging sites were selected, recorded as plugging material formula 1 and plugging material formula 2, and field measurements and analyses were carried out.

[0106] (1) Analysis of leakage fracture characteristics;

[0107] Based on the actual drilling situation of the target area reservoir, the drilling fluid loss data and imaging logging data were first collected and analyzed in detail. Through data analysis, it was determined that the reservoir drilling fluid loss was mainly concentrated in high-angle millimeter-level cracks with a crack width of about 1-3mm. The occurrence and distribution of these cracks directly affect the selection of plugging materials and the evaluation of plugging effects.

[0108] (2) Preparation for indoor simulation experiments;

[0109] According to the crack occurrence and crack size measured on site, the corresponding indoor crack sealing experiment was designed. To ensure that the experiment is consistent with the actual situation, a wedge-shaped steel plunger was used to simulate the 1-3 mm cracks on site as the crack rock sample (such as Figure 2 As shown, the left picture is a side view of the fractured rock sample, and the right picture is a fracture view of the fractured rock sample) to evaluate the sealing effect of the plugging material.

[0110] (3) Leakage plugging test;

[0111] Using the determined fractured rock samples, the plugging materials to be evaluated are used to prepare plugging slurry and conduct fracture plugging experiments. Figure 3 , Figure 4 The indoor crack plugging test curves of plugging material formula 1 and plugging material formula 2 are shown respectively, and the maximum crack plugging strength p is monitored during the crack plugging test. a The shortest time required for crack sealing b Among them, the maximum crack plugging strength of plugging material formula 1 is 14.6MPa, and the shortest time required for crack plugging is 10.8min; the maximum crack plugging strength of plugging material formula 2 is 16.7MPa, and the shortest time required for crack plugging is 22.2min.

[0112] (4) On-site crack characteristics analysis and plugging requirements;

[0113] Combined with the drilling fluid loss situation and fracture development characteristics of the target area reservoir, it is judged that the drilling fluid loss type of this reservoir is mainly extended and extended loss, which has high requirements on the permeability and plugging ability of the plugging material.

[0114] (5) Leakage intensity and efficiency requirements;

[0115] According to the actual needs of on-site engineering operations, the maximum fracture plugging strength requirement during reservoir drilling is 25MPa, and the shortest time required for fracture plugging must be controlled within 10 minutes to avoid adverse effects on downhole operations due to excessive leakage time.

[0116] (6) Leakage plugging efficiency evaluation

[0117] According to formula (1), the optimal plugging efficiency of target area drilling plugging material formula 1 and plugging material formula 2 is calculated respectively.pe The results of the optimization show that although the plugging material formula 2 has a higher plugging strength, the plugging material formula 1 has a more excellent plugging efficiency and is more suitable for the control of drilling fluid loss in the target reservoir.

[0118] Combined with the actual situation on site and experimental data, the plugging material formula 1 shows better adaptability in dealing with extended leakage due to its higher plugging efficiency and faster plugging speed. In practical applications, it is recommended to give priority to plugging material formula 1 for drilling fluid loss control in the target area reservoir, which helps to improve operation efficiency and reduce downhole risks.

[0119] Based on the same inventive concept, the present invention also proposes a drilling plugging material selection system, such as Figure 5 Shown, incl.

[0120] A first data acquisition unit is used to perform a crack plugging experiment on the crack rock sample using the prepared plugging slurry, and acquire first data during the crack plugging experiment;

[0121] A drilling fluid loss type determination unit is used to determine the reservoir drilling fluid loss type based on the development of drilling fluid loss fractures in the target area reservoir;

[0122] A second data determination unit, used to determine second data in the reservoir drilling process according to actual requirements of the drilling operation of the target area reservoir;

[0123] An optimal plugging efficiency calculation unit, used to calculate the optimal plugging efficiency of the drilling plugging material of the target area reservoir according to the type of drilling fluid loss in the target area reservoir and based on the first data and the second data;

[0124] The plugging material selection unit is used to select the plugging material according to the reservoir drilling fluid loss type and the optimal plugging efficiency.

[0125] Another exemplary embodiment of the present invention provides an electronic device. Figure 6 As shown, the electronic device includes at least one processor 601, at least one communication interface 602, at least one memory 603 and at least one communication bus 604; wherein the processor 601, the communication interface 602 and the memory 603 communicate with each other through the communication bus 604;

[0126] Memory 603, storing computer programs;

[0127] The processor 601 is used to implement the drilling plugging material selection method when executing the program stored in the memory 603.

[0128] Optionally, the communication interface may be an interface of a communication module, such as an interface of a GSM module; the processor may be a processor CPU, or an application specific integrated circuit ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to implement the embodiments of the present invention. The memory may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory. The memory stores a program, and the processor calls the program stored in the memory to execute some or all of the above method embodiments.

[0129] Based on the same inventive concept, the embodiment of the present application further provides a computer-readable storage medium storing a computer program, which implements part or all of the above method embodiments when the computer program is executed. Optionally, the storage medium may be a non-temporary computer-readable storage medium, for example, the non-temporary computer-readable storage medium may be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, etc.

[0130] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for selecting a drilling plugging material, characterized in that: The following steps are involved: Use the prepared plugging slurry to conduct crack plugging experiments on crack rock samples, and obtain the first data during the crack plugging experiment; Determine the type of drilling fluid loss in the target area based on the development of drilling fluid loss fractures in the target area reservoir; Determine the second data in the reservoir drilling process according to the actual demand of the drilling operation of the target area reservoir; Calculate the optimal plugging efficiency of the target area reservoir drilling plugging material according to the target area reservoir drilling fluid loss type and based on the first data and the second data; The plugging material is selected according to the reservoir drilling fluid loss type and the optimal plugging efficiency.

2. The method for selecting a drilling plugging material according to claim 1, characterized in that: The first data is the maximum crack sealing strength and the shortest time required for crack sealing during the crack sealing experiment; The second data is the maximum fracture plugging strength and the shortest time required for fracture plugging during the actual drilling operation of the target area reservoir.

3. The method for selecting a drilling plugging material according to claim 2, characterized in that: The maximum fracture plugging strength is the maximum displacement pressure monitored before fracture plugging fails.

4. The method for selecting a drilling plugging material according to claim 2, characterized in that: The shortest time required for fracture plugging is the minimum displacement time required after the fracture plugging layer has been formed.

5. The method for selecting a drilling plugging material according to claim 1, characterized in that: The fractured rock sample was prepared by the following method: Based on the engineering geological data of the target area reservoir, determine the development of reservoir drilling fluid leakage fractures; According to the development of the leakage fractures, the fracture rock samples for indoor fracture plugging experiments are prepared.

6. The method for selecting a drilling plugging material according to claim 1 or 5, characterized in that: The fractured rock sample includes an artificial rock core or a natural rock sample.

7. The method for selecting a well drilling plugging material according to claim 2, characterized in that: The method of performing a crack plugging experiment on a crack rock sample using the prepared plugging slurry and obtaining first data during the crack plugging experiment includes the following steps: Inject the prepared plugging slurry into the cracks of the fractured rock sample. During the grouting process, monitor the changes in grouting pressure, record the start and end time of grouting, and calculate the time required for crack plugging. After the plugging slurry is completely cured, evaluate the crack sealing strength.

8. The method for selecting a drilling plugging material according to claim 1, characterized in that: Determining the type of drilling fluid loss in the target area reservoir based on the development of drilling fluid loss fractures in the target area reservoir comprises the following steps: Collect drilling fluid loss data, reservoir imaging logging data and geological information of the target area reservoir; Identify the reservoir's lithology, physical properties and the presence of fractures by analyzing the reservoir's imaging logging data; Use geological data to identify the sedimentary phases and lithology of the reservoir in the target area, and observe the development of core fractures in the target area; The drilling fluid loss type is determined based on the results of sedimentary phase identification and lithology classification combined with the development of core fractures in the target area and drilling fluid loss data.

9. The method for selecting a drilling plugging material according to claim 1 or 8, characterized in that: The drilling fluid leakage fracture development conditions include fracture occurrence and fracture size; The fracture occurrence includes the direction, inclination and dip of the fracture; The fracture dimensions include the width, length, depth and volume density of the fracture.

10. The method for selecting drilling plugging materials according to claim 8, characterized in that: The drilling fluid loss data include mud loss layer, loss amount and loss velocity.

11. The method for selecting a drilling plugging material according to claim 8, characterized in that: The imaging logging data of the reservoir includes geological exploration reports, logging data, and core analysis data; The logging data include natural gamma logging curve, sonic time difference logging curve, density logging curve and resistivity curve.

12. The method for selecting a drilling plugging material according to claim 2 or 8, characterized in that: The reservoir drilling fluid loss types include induced fracture type loss, fracture extension type loss and large and medium fracture type loss.

13. The method for selecting a drilling plugging material according to claim 12, characterized in that: The method of calculating the optimal plugging efficiency of the target area reservoir drilling plugging material according to the target area reservoir drilling fluid loss type and based on the first data and the second data comprises the following steps: Determine the fracture plugging strength coefficient and fracture plugging time coefficient according to the drilling fluid loss type of the target reservoir; The optimal plugging efficiency of the target area reservoir drilling plugging material is calculated according to the fracture plugging strength coefficient, the fracture plugging time coefficient, the first data and the second data.

14. The method for selecting a drilling plugging material according to claim 13, characterized in that: The calculation formula for calculating the optimal plugging efficiency of the target area reservoir drilling plugging material based on the fracture plugging strength coefficient, the fracture plugging time coefficient, the first data and the second data is as follows: Among them, O pe is the optimal plugging performance of the plugging material, p a is the maximum crack sealing strength in the crack sealing experiment, p b is the shortest time required for crack plugging in the crack plugging experiment, A is the crack plugging strength coefficient, B is the crack plugging time coefficient, and p a-max is the maximum fracture plugging strength during reservoir drilling, p b-min It is the shortest time required to seal fractures during reservoir drilling.

15. The method for selecting a well drilling plugging material according to claim 13, characterized in that: When the target area reservoir drilling fluid loss type is induced fracture type loss, the fracture plugging strength coefficient and the fracture plugging time coefficient are 0.1 and 0.9 respectively.

16. The method for selecting a drilling plugging material according to claim 13, characterized in that: When the target area reservoir drilling fluid loss type is extended extension type loss, the fracture plugging strength coefficient and the fracture plugging time coefficient are 0.5 and 0.5 respectively.

17. The method for selecting a drilling plugging material according to claim 13, characterized in that: When the target area reservoir drilling fluid loss type is large or medium fracture type loss, the fracture plugging strength coefficient and the fracture plugging time coefficient are 0.9 and 0.1 respectively.

18. A system for selecting a material for plugging a well, characterized in that: include: A first data acquisition unit is used to perform a crack plugging experiment on the crack rock sample using the prepared plugging slurry, and acquire first data during the crack plugging experiment; A drilling fluid loss type determination unit is used to determine the reservoir drilling fluid loss type based on the development of drilling fluid loss fractures in the target area reservoir; A second data determination unit, used to determine second data in the reservoir drilling process according to actual requirements of the drilling operation of the target area reservoir; An optimal plugging efficiency calculation unit, used to calculate the optimal plugging efficiency of the drilling plugging material of the target area reservoir according to the type of drilling fluid loss in the target area reservoir and based on the first data and the second data; The plugging material selection unit is used to select the plugging material according to the reservoir drilling fluid loss type and the optimal plugging efficiency.

19. An electronic device, characterized in that: It includes a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other via the communication bus; a memory storing a computer program; The processor is used to implement the method for selecting drilling plugging materials as described in any one of claims 1 to 17 when executing the program stored in the memory.

20. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed, the method for selecting a drilling plugging material according to any one of claims 1 to 17 is executed.

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