A method, system, electronic device and storage medium for selecting drilling plugging material

Abstract

The present invention belongs to the field of drilling technology, and particularly relates to a method, system, electronic device and storage medium for selecting plugging materials for drilling. 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 plugging material selection method suitable for efficient plugging of reservoirs. The method is highly targeted and can effectively select plugging materials. It is highly operable, has good repeatability, is easy to operate, and has low economic cost. By optimizing the selection of plugging materials through 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 the industry's technical level.

Description

Technical Field

[0001] The present 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] Current plugging material selection primarily refers to the industry standard SY / T5840-2007 (Indoor Test Method for Bridging Plugging Materials for Drilling Fluids). This involves adding plugging materials to drilling fluid to create a plugging slurry, selecting fracture-type fracture modules, and uniformly pressurizing the test vessel, with the maximum pressure-bearing capacity used as the evaluation metric. However, this current plugging material selection method fails to consider the reservoir drilling fluid loss mechanism and the plugging mechanics. This results in poor adaptability of the selected plugging materials to the reservoir, leading to significant variability in field test results.

[0003] Prior art also uses modeling to select plugging materials. For example, patent publication number CN116451612A proposes a method for selecting plugging materials for drilling and completion in deep fractured formations. This patent establishes a physical model of the target fracture plugging layer based on the parameters of the target zone plugging layer. The larger energy dissipation rate of the plugging layer during positive and negative pressure bearing processes is then used as a preferred indicator to select long-lasting and stable plugging materials. However, this method requires constructing a physical model of the fracture plugging layer, which involves acquiring and training multiple parameters and is less realistic than actual simulation experiments.

[0004] There is also a patent CN116432399A that discloses an experimental evaluation method for the control of drilling fluid loss in fractured formations. This method mainly divides drilling fluid loss into three categories based on the cause of loss, and clarifies the main controlling factors and their weight ratios of different loss types. By comparing the indoor and on-site drilling fluid loss control efficiency, the indoor experimental method with the highest degree of 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 controlling factors. Finally, a quantitative scoring formula can be used to accurately optimize 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, the selection relies on experience, and there is a lack of basis for the selection of plugging materials, the present invention proposes the following solutions:

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

[0007] Conduct crack sealing experiments on cracked rock samples using the prepared plugging slurry and obtain the first data during the crack sealing 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;

[0009] Determining second data during the reservoir drilling process according to actual requirements of the drilling operation of the target area reservoir;

[0010] Calculating the optimal plugging efficiency of the target area reservoir drilling plugging material based on the target area reservoir drilling fluid loss type and 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 sealing strength and the shortest time required for crack sealing during the crack sealing 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 according to the following method:

[0017] Determine the development of drilling fluid leakage fractures in the reservoir based on the engineering geological data of the target area;

[0018] According to the development of the leakage fractures, fracture rock samples for indoor fracture sealing experiments were 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 sealing experiment on a cracked rock sample using the prepared plugging slurry and obtaining first data during the crack sealing 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 to plug the cracks.

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

[0023] Furthermore, the method of 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 includes 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 sedimentary facies and lithologic classification of reservoirs 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 facies identification and lithologic 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 strike, inclination and dip of the fracture;

[0030] The crack size includes the width, length, depth and volume density of the crack.

[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 ray 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] Furthermore, 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 includes 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 based on 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 sealing 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 sealing in the crack sealing experiment, A is the crack sealing strength coefficient, B is the crack sealing time coefficient, and p a-max is the maximum fracture sealing strength during reservoir drilling, p b-min The shortest time required to seal fractures during reservoir drilling.

[0041] Furthermore, when the drilling fluid loss type of the target area reservoir is induced fracture 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 sealing experiment on a cracked rock sample using the prepared plugging slurry and to acquire first data during the crack sealing 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 determining unit is 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, configured to calculate the optimal plugging efficiency of the drilling plugging material for the target area reservoir according to the drilling fluid loss type of 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 provides a computer-readable storage medium storing a computer program, which, when executed, executes the method for selecting drilling plugging materials.

[0054] Beneficial effects of the present invention:

[0055] The present invention is based on the physical mechanism of reservoir drilling fluid leakage and the mechanical mechanism of drilling plugging and plugging, and provides a method for selecting reservoir drilling plugging materials based on optimal plugging efficiency, with a reliable theoretical basis; 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, and it 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 in part will become apparent from the description, or will be 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 is a brief introduction to 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 any 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 sealing test curve of the plugging material formula 1 in the embodiment of the present invention is shown;

[0061] Figure 4 The indoor crack sealing 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 drilling plugging material selection system proposed in an embodiment of the present invention is shown;

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

[0064] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0065] The present invention proposes a method for selecting drilling plugging materials, 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 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, well logging data may be interpreted to identify reservoir characteristics to determine the presence of fractures, and target area cores may be analyzed to observe fracture occurrence and leakage fracture size;

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

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

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

[0075] Fracture dimensions include width, length, depth, and volume density. Fracture width can be measured directly on cores or calculated indirectly using methods such as dual laterologs and sonic logging in well logging data. Fracture length can be determined by statistically analyzing the length and spacing of fractures using core observations. For fracture spacing greater than the wellbore diameter, statistical methods such as the fracture spacing index method can be used to estimate fracture spacing. Fracture volume density can be calculated by calculating the total surface area of ​​the fractures and the total rock volume based on the intersection of the fractures with the core.

[0076] S2: Prepare fractured rock samples for indoor fracture sealing experiments based on the development of leaking fractures;

[0077] Specifically, an artificial rock 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 treated, including cleaning impurities on the crack surface and keeping the cracks dry, so as to ensure the smooth progress of the sealing experiment.

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

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

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

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

[0083] Connect the grouting equipment to the grouting nozzle and 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 times of grouting, and calculate the time required to plug the cracks.

[0085] After the plugging is completed, continue to squeeze the plugging slurry and monitor the maximum pressure value during the squeezing process. This value is the maximum crack sealing 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 sedimentary facies and lithologic classification of reservoirs 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 facies identification and lithologic 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, reservoir drilling fluid loss types can be categorized as underdeveloped fracture reservoirs, non-leakage-inducing natural fracture reservoirs, and developed leakage-inducing natural fracture reservoirs based on the degree of reservoir fracture development. The corresponding drilling fluid loss types for these three types of reservoirs are induced fracture loss, fracture extension loss, and large and medium fracture loss, respectively.

[0092] The drilling fluid loss control mechanism of fractured reservoirs is closely related to the reservoir loss mechanism. For reservoirs with induced fracture-type leakage, the loss 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 with 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, the key to controlling leakage is to form a fracture plugging layer within the fracture to isolate the fracture tip and increase the fracture extension pressure (increasing the fracture extension pressure method).

[0094] The main leakage mechanism of reservoirs with large and medium-sized 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 seal the cracks. The fracture sealing 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 during 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 based on the target area reservoir drilling fluid loss type and 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 sealing 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 sealing in the crack sealing experiment, A is the crack sealing strength coefficient, B is the crack sealing time coefficient, and p a-max is the maximum fracture sealing strength during reservoir drilling, p b-min The shortest time required to seal fractures during reservoir drilling.

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

[0103] S7: Selecting a plugging material 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 analysis were carried out.

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

[0107] Based on the actual drilling conditions in the target reservoir, drilling fluid loss data and imaging logging data were first collected and analyzed in detail. This data analysis determined that the reservoir's drilling fluid loss was primarily concentrated in high-angle, millimeter-scale fractures, approximately 1-3 mm wide. The occurrence and distribution of these fractures directly influenced the selection of plugging materials and the evaluation of plugging effectiveness.

[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 cracks of 1 to 3 mm 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 identified crack rock samples, the plugging material to be evaluated is prepared into plugging slurry to conduct crack sealing experiments. Figure 3 、 Figure 4 The indoor crack sealing test curves of plugging material formula 1 and plugging material formula 2 are shown respectively, and the maximum crack sealing strength p is monitored during the crack sealing test. a The shortest time required for crack sealing b Among them, the maximum crack sealing strength of plugging material formula 1 is 14.6MPa, and the shortest time required for crack sealing is 10.8min; the maximum crack sealing strength of plugging material formula 2 is 16.7MPa, and the shortest time required for crack sealing is 22.2min.

[0112] (4) On-site crack feature 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 sealing 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 25 MPa, and the shortest time required for fracture plugging must be controlled within 10 minutes to avoid adverse effects on downhole operations caused by 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 optimization results 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 drilling fluid loss control in the target reservoir.

[0118] Based on actual field conditions and experimental data, Plugging Material Formula 1 demonstrates superior adaptability for addressing extended and extended losses due to its higher plugging efficiency and faster plugging speed. In practical applications, Plugging Material Formula 1 is recommended as a preferred choice for controlling drilling fluid losses in target reservoirs, helping to improve operational 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 sealing experiment on a cracked rock sample using the prepared plugging slurry and to acquire first data during the crack sealing 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 determining unit is 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, configured to calculate the optimal plugging efficiency of the drilling plugging material for the target area reservoir according to the drilling fluid loss type of 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 via the communication bus 604;

[0126] Memory 603, storing computer programs;

[0127] The processor 601 is configured 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 CPU, or an 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, such as at least one disk storage. The memory stores a program, and the processor calls the program stored in the memory to execute some or all of the above-mentioned method embodiments.

[0129] Based on the same inventive concept, an embodiment of the present application further provides a computer-readable storage medium storing a computer program, wherein when the computer program is executed, some or all of the above-mentioned method embodiments are implemented. Optionally, the storage medium may be a non-transitory computer-readable storage medium, for example, 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 replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to 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: Performing a crack sealing experiment on a cracked rock sample using the prepared plugging slurry, and obtaining first data during the crack sealing experiment; the first data being the maximum crack sealing strength and the shortest time required for crack sealing during the crack sealing 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; determining second data during the reservoir drilling process according to actual drilling operation requirements of the target area reservoir; the second data being the maximum fracture plugging strength and the shortest fracture plugging time during the actual drilling operation of the target area reservoir; Calculating the optimal plugging efficiency of the target area reservoir drilling plugging material based on the target area reservoir drilling fluid loss type and the first data and the second data; including: determining a fracture plugging strength coefficient and a fracture plugging time coefficient based on the target area reservoir drilling fluid loss type; 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; the calculation formula for the optimal plugging efficiency of the target area reservoir drilling plugging material is as follows: in, To achieve the best sealing performance of plugging materials, is the maximum crack sealing strength in the crack sealing experiment, is the shortest time required for crack sealing in the crack sealing experiment, A is the crack sealing strength coefficient, B is the crack sealing time coefficient, is the maximum fracture sealing strength during reservoir drilling, The shortest time required to seal fractures during reservoir drilling; 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, wherein: The maximum fracture plugging strength is the maximum displacement pressure monitored before fracture plugging fails.

3. The method for selecting a drilling plugging material according to claim 1, wherein: The shortest time required for crack plugging is the minimum displacement time required after the crack plugging layer has been formed.

4. The method for selecting a drilling plugging material according to claim 1, wherein: The fractured rock sample was prepared as follows: Determine the development of drilling fluid leakage fractures in the reservoir based on the engineering geological data of the target area; According to the development of the leakage fractures, fracture rock samples for indoor fracture sealing experiments were prepared.

5. The method for selecting a drilling plugging material according to claim 1 or 4, wherein: The fractured rock sample includes an artificial rock core or a natural rock sample.

6. The method for selecting a drilling plugging material according to claim 1, wherein: The method of performing a crack sealing experiment on a cracked rock sample using the prepared plugging slurry and obtaining first data during the crack sealing 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 to plug the cracks. After the plugging slurry is completely solidified, evaluate the crack sealing strength.

7. The method for selecting a drilling plugging material according to claim 1, wherein: 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 sedimentary facies and lithologic classification of reservoirs 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 facies identification and lithologic classification, combined with the development of core fractures in the target area and drilling fluid loss data.

8. The method for selecting a drilling plugging material according to claim 1 or 7, wherein: The drilling fluid loss fracture development conditions include fracture occurrence and fracture size; The fracture occurrence includes the strike, inclination and dip of the fracture; The crack size includes the width, length, depth and volume density of the crack.

9. The method for selecting drilling plugging materials according to claim 7, characterized in that: The drilling fluid loss data includes mud loss layer, loss amount and loss velocity.

10. The method for selecting drilling plugging materials according to claim 7, 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 ray logging curve, sonic time difference logging curve, density logging curve and resistivity curve.

11. The method for selecting a drilling plugging material according to claim 2 or 7, wherein: The reservoir drilling fluid loss types include induced fracture type loss, fracture extension type loss and large and medium fracture type loss.

12. The method for selecting a drilling plugging material according to claim 1, wherein: When the drilling fluid loss type of the target area reservoir is induced fracture loss, the fracture plugging strength coefficient and the fracture plugging time coefficient are 0.1 and 0.9 respectively.

13. The method for selecting drilling plugging materials according to claim 1, characterized in that: 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.

14. The method for selecting a drilling plugging material according to claim 1, wherein: 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.

15. A drilling plugging material selection system, characterized in that: include: A first data acquisition unit is used to perform a crack sealing experiment on a cracked rock sample using the prepared plugging slurry and to acquire first data during the crack sealing experiment; The first data is the maximum crack sealing strength and the shortest time required for crack sealing during the crack sealing 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 determining unit, configured to determine second data during the reservoir drilling process according to actual requirements of the drilling operation of the target area reservoir; the second data being the maximum fracture plugging strength and the shortest fracture plugging time during the actual drilling operation of the target area reservoir; The optimal plugging efficiency calculation unit is used to calculate the optimal plugging efficiency of the target area reservoir drilling plugging material based on the target area reservoir drilling fluid loss type and the first data and the second data; the calculation unit includes: determining the fracture plugging strength coefficient and the fracture plugging time coefficient according to the target area reservoir drilling fluid loss type; 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; the calculation formula for the optimal plugging efficiency of the target area reservoir drilling plugging material is as follows: in, To achieve the best sealing performance of plugging materials, is the maximum crack sealing strength in the crack sealing experiment, is the shortest time required for crack sealing in the crack sealing experiment, A is the crack sealing strength coefficient, B is the crack sealing time coefficient, is the maximum fracture sealing strength during reservoir drilling, The shortest time required to seal fractures during reservoir drilling; 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.

16. An electronic device, characterized in that: The processor, the communication interface, the memory and the communication bus are connected to each other via the communication bus. a memory storing a computer program; The processor is configured to implement the method for selecting a drilling plugging material according to any one of claims 1 to 14 when executing a program stored in the memory.

17. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is run, the method for selecting a drilling plugging material according to any one of claims 1 to 14 is executed.

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