Method for characterizing three-dimensional structure of solid-phase particle packing void in drilling fluid, apparatus and device

Abstract

A method for characterizing a three-dimensional structure of a solid-phase particle packing void in drilling fluid, an apparatus and a device. The method comprises: S110, acquiring scanning data of drilling fluid; S120, constructing a three-dimensional space structure of the drilling fluid on the basis of the scanning data, wherein a three-dimensional structure of a solid-phase particle packing void is characterized in the three-dimensional space structure; S130, on the basis of the three-dimensional space structure, calculating a parameter value corresponding to a geometrical morphology influence parameter; and S140, using the parameter value of the geometrical morphology influence parameter to determine a void structure type of the drilling fluid, wherein the void structure type is used for characterizing the three-dimensional structure of the solid-phase particle packing void in the drilling fluid.

Description

Method, device and equipment for characterizing the three-dimensional structure of pores of solid-phase particles in drilling fluid

[0001] Related applications

[0002] This application claims priority to the Chinese invention patent application with application number 202311559979.1 filed on November 21, 2023, and cites the entire contents disclosed in the above patent application as part of this application. Technical Field

[0003] The present disclosure relates to the technical field of geological exploration and development, and in particular to a method, device and equipment for characterizing the three-dimensional structure of pores of solid-phase particles accumulated in drilling fluid. Background Art

[0004] With the continuous advancement of geological exploration and development, we have entered a stage where both conventional and unconventional oil and gas development are equally important. Due to the vast reserves of proven unconventional oil and gas resources in deep and ultra-deep formations, unconventional oil and gas exploration and development are moving deeper, hotter, and at higher pressures. In this context, high-density drilling fluid systems offer advantages in balancing high formation pressure, maintaining downhole pressure, and enhancing wellbore stability, making them a key technology for exploration and development in deep and ultra-deep wells.

[0005] To accommodate different construction requirements, additional weighting materials may be added to high-density drilling fluids to adjust the fluid's density limit. However, different types of weighting agents differ in many aspects, including micromorphology, particle size, specific surface area, applied force, and contact support effect. To meet the development needs of deep and ultra-deep wells, it is necessary to effectively optimize the stacking pattern of weighting agent particles in high-density drilling fluids to break the limit of drilling fluid density.

[0006] Therefore, determining the accumulation pattern of weighting agent particles in drilling fluid is crucial for drilling and development. However, drilling fluid is a multi-component liquid system, each component in a dynamically stable state and subject to the influence of various conditions during the drilling process. Currently, there is a lack of effective methods for characterizing the three-dimensional pore structure of the solid-phase particles in the drilling fluid. Therefore, there is an urgent need for a method that can accurately and effectively characterize the three-dimensional pore structure of the dynamic accumulation of solid-phase particles in drilling fluid.

[0007] Summary of the Invention

[0008] The purpose of the embodiments of the present disclosure is to provide a method, device and equipment for characterizing the three-dimensional structure of the pores of the solid-phase particles in the drilling fluid, so as to solve the problem of how to accurately and effectively characterize the three-dimensional structure of the dynamic accumulation pores of the solid-phase particles in the drilling fluid.

[0009] In order to solve the above technical problems, the embodiment of the present disclosure proposes a method for characterizing the three-dimensional structure of pores of solid-phase particles in drilling fluid, including: obtaining scanning data of drilling fluid; constructing a three-dimensional spatial structure of drilling fluid based on the scanning data; characterizing the three-dimensional structure of pores with solid-phase particles in the three-dimensional spatial structure; calculating parameter values ​​corresponding to geometric morphology influencing parameters based on the three-dimensional spatial structure; determining the pore structure type of drilling fluid using the parameter values ​​of the geometric morphology influencing parameters; the pore structure type is used to characterize the three-dimensional structure of pores with solid-phase particles in drilling fluid.

[0010] In some embodiments, the drilling fluid includes high-density high-solid drilling fluid; the scan data includes CT scan data; and the scan data includes scan data of the drilling fluid in a flowing state and / or a static state.

[0011] In some embodiments, obtaining scanning data of the drilling fluid includes: adjusting the pressure, temperature, and stirring speed of the drilling fluid to adapt to the target formation; and scanning the adjusted drilling fluid to obtain scanning data.

[0012] In some embodiments, constructing a three-dimensional spatial structure of drilling fluid based on scanning data includes: distinguishing different drilling fluid components in the scanning data; the drilling fluid components include at least one of oil, water, weighting agent and drilling fluid treatment agent materials; reconstructing the three-dimensional space of the drilling liquid phase based on the identified drilling fluid components to obtain three-dimensional data of the drilling liquid phase; the three-dimensional drilling liquid phase data includes a three-dimensional image; stripping out three-dimensional data of solid phase particles in the drilling liquid phase space from the three-dimensional drilling liquid phase data; the three-dimensional data of the solid phase particles is used to describe the three-dimensional structural form of the pores of the solid phase particles.

[0013] In some embodiments, the geometric morphology influencing parameters include at least one of the following: connectivity parameter, shape parameter, appearance parameter and Euler parameter; the connectivity parameter is the number of interconnected pores in the pore structure of solid-phase particles in the drilling fluid; the shape parameter is used to describe the regularity of the pore structure of solid-phase particles; the appearance parameter is the ratio of the length of the longest axis to the shortest axis of the pore structure of solid-phase particles in the drilling fluid; the Euler parameter is used to describe the complexity of the pore structure of solid-phase particles in the drilling fluid.

[0014] Based on the above embodiment, the parameter value corresponding to the geometric morphology influencing parameter is calculated according to the three-dimensional spatial structure, including: using the formula Calculate the shape parameter, where G1 is the shape parameter, S is the surface area of ​​the pores formed by the accumulation of solid particles in the drilling fluid, and V is the volume of the pores formed by the accumulation of solid particles in the drilling fluid; use the formula Calculate the shape factor, where G is the shape parameter, L is the longest axial length of the selected pore structure, and W is the shortest axial length of the selected pore structure. Calculate the Euler parameter using the formula E = 1-b1 + b2, where E is the Euler parameter, β1 is the number of pores formed by the accumulation of solid particles in the drilling fluid within the selected space, and β2 is the number of closed pores formed by the accumulation of solid particles in the drilling fluid within the selected space.

[0015] In some embodiments, the pore structure type includes at least one of a clustered pore structure, a branched pore structure, a flat pore structure, and a closed pore structure.

[0016] Based on the above embodiment, different pore structure types are pre-set with parameter definition ranges; the pore structure type of the drilling fluid is determined using the parameter value of the geometric morphology influencing parameter, including: determining the specific parameter definition range corresponding to the parameter value of the geometric morphology influencing parameter (for example, it can be a pre-set parameter definition range); determining the pore structure type of the drilling fluid according to the specific parameter definition range.

[0017] Based on the above embodiment, the parameter definition range corresponding to the clustered pore structure is the connection parameter C n >5, shape parameter G1>2, Euler parameter E≤-1; the parameter definition range for branched pore structure is 1≤connectivity parameter C n ≤5, shape parameter G1>2, Euler parameter E>-1; the parameter definition range corresponding to the flat pore structure is the shape parameter G>8, shape parameter G1<0.4, Euler parameter E>0; the closed pore structure includes spherical pore structure and columnar pore structure; among them, the parameter definition range corresponding to the spherical pore structure is the connectivity parameter C n =1, 1≤ shape parameter G≤8, Euler parameter E>0, shape parameter G1≤2, the parameter definition range corresponding to the columnar pore structure is the connection parameter C n =1, 1≤shape parameter G≤8, Euler parameter E>0, G1>2.

[0018] The disclosed embodiment also proposes a three-dimensional structure characterization device for pores of accumulated solid-phase particles in drilling fluid, comprising: a scanning data acquisition module for acquiring scanning data of drilling fluid; a three-dimensional space structure construction module for constructing a three-dimensional space structure of drilling fluid based on the scanning data; a three-dimensional structure characterizing pores of accumulated solid-phase particles in the three-dimensional space structure; a parameter value calculation module for calculating parameter values ​​corresponding to geometric morphology influencing parameters based on the three-dimensional space structure; a pore structure type determination module for determining the pore structure type of drilling fluid using the parameter values ​​of the geometric morphology influencing parameters; the pore structure type is used to characterize the three-dimensional structure of pores of accumulated solid-phase particles in drilling fluid.

[0019] The embodiments of the present disclosure also provide a three-dimensional structure characterization device for the pores of the accumulated solid phase particles in the drilling fluid, including a memory and a processor; the memory is used to store computer programs / instructions; the processor is used to execute computer programs / instructions to implement the above-mentioned three-dimensional structure characterization method for the pores of the accumulated solid phase particles in the drilling fluid.

[0020] As can be seen from the technical solutions provided by the above embodiments of the present disclosure, the method for characterizing the three-dimensional structure of the pores of the accumulated solid-phase particles in the drilling fluid in the embodiments of the present disclosure obtains scanning data of the drilling fluid and uses the scanning data to complete the construction of the three-dimensional spatial structure of the drilling fluid, and then calculates the parameter values ​​of the corresponding geometric morphology influencing parameters based on the three-dimensional spatial structure, thereby determining the pore structure type using the corresponding parameter values, and completing the characterization of the three-dimensional structure of the pores of the accumulated solid-phase particles in the drilling fluid. Through the above method, the three-dimensional structure of the pores of the accumulated solid-phase particles in the drilling fluid is effectively characterized, so that the accumulation mode of the weighting agent particles in the drilling fluid can be optimized in subsequent applications, thereby breaking through the density limit of the drilling fluid, which is beneficial to the exploration and development of deep and ultra-deep layers. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present disclosure 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 only some embodiments recorded in the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] FIG1 is a schematic flow chart of a method for characterizing the three-dimensional structure of pores of solid-phase particles in a drilling fluid according to an embodiment of the present disclosure;

[0023] FIG2 is a schematic diagram of the spatial distribution of a pore structure geometric form according to an embodiment of the present disclosure;

[0024] FIG3 is a schematic diagram of parameters of different pore structure types according to an embodiment of the present disclosure;

[0025] FIG4 is a schematic diagram of a module of a drilling fluid solid phase particle accumulation pore three-dimensional structure characterization device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0026] The following will be combined with the accompanying drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the embodiments described are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present disclosure.

[0027] To address the aforementioned technical issues, the present disclosure proposes a method for characterizing the three-dimensional structure of pores in the accumulation of solid-phase particles in drilling fluid. This method can be performed by a computing device, including but not limited to servers, industrial computers, and PCs. As shown in Figure 1, the method includes the following specific implementation steps.

[0028] S110: Obtaining scanning data of the drilling fluid.

[0029] Usually, drilling fluid is an oil-in-water emulsion system composed of base oil, water, primary emulsifier and auxiliary emulsifier. The oil phase content and water phase content are generally between 95:5 and 70:30. The primary emulsifier and auxiliary emulsifier play the role of emulsifying and stabilizing the emulsion. In response to the construction needs of deep wells and ultra-deep wells, it is necessary to add fine particles such as barite, iron ore powder, micromanganese ore, and ilmenite powder to the drilling fluid to increase and adjust the fluid density, that is, to generate high-density drilling fluid. In order to adapt to the development of deep and ultra-deep areas, weighting materials with smaller particle sizes are selected to increase the packing density between particles, thereby increasing the density limit of the drilling fluid. For example, after using weighting materials such as micro-nano calcium carbonate, ultra-fine barite, micro-manganese, and ultra-fine ilmenite, the density limit of water-based drilling fluid and oil-based drilling fluid has been increased to 2.75g / cm 3 and 2.90g / cm 3 .

[0030] However, the drilling fluid system under this density limit still cannot meet the needs of deep and ultra-deep oil and gas resource exploration and development, and it cannot serve as an emergency preventive measure to effectively control overflows and prevent blowouts. In addition, different types of weighting agents differ in many aspects such as micromorphology, particle size, specific surface area, force, contact support effect, etc. The key to optimizing the stacking mode of weighting agent particles in high-density drilling fluids is to select suitable weighting agent particles to fill the stacking pore space, reduce the stacking pore space between particles, and thus achieve the purpose of increasing the ultimate density of the drilling fluid. However, due to the limitation that drilling fluid belongs to a multi-component liquid phase system, each component is in a dynamically stable state of sedimentation and suspension, and the construction environment is often accompanied by shear conditions such as mechanical stirring and drill bit water jetting, there is still no effective means to characterize the three-dimensional structure of the stacking pores of solid phase particles in drilling fluids, and there is a lack of scientific guidance methods to improve the weighting limit.

[0031] Therefore, in order to effectively break through the density limit of drilling fluid, it is necessary to determine the stacking mode of weighting agent particles in the drilling fluid, that is, to determine the three-dimensional structure of the dynamic stacking pores of solid phase particles in the drilling fluid.

[0032] To accurately determine the three-dimensional geometry of the drilling fluid's pore structure, scanning data of the drilling fluid must first be obtained. This scanning data is used to identify the internal structure or components of the drilling fluid. In some specific examples, the scanning data can be CT scan data or other types of scanning data, without limitation.

[0033] In some embodiments, the drilling fluid may be a high-density drilling fluid. Accordingly, the high-density drilling fluid may be pre-configured according to requirements.

[0034] In some embodiments, the process of obtaining scanning data can be to first load the drilling fluid into a scanning container that can adjust the pressure, temperature and stirring speed. Afterwards, the pressure, temperature and stirring speed of the drilling fluid can be adjusted according to the scanning requirements. The final adjustment result can be set according to specific needs. For example, after determining the target formation for the application of the drilling fluid, the drilling fluid is set according to the pressure and temperature of the target formation, and the corresponding stirring speed is set according to the actual stirring speed requirements. After the pressure, temperature and stirring speed are set and maintained stable, the drilling fluid is scanned to obtain scanning data. It should be noted that the scanning data includes scanning data of the drilling fluid in a flowing state and / or a static state, that is, the drilling fluid can be set to be stirred at a specific stirring speed, or the stirring switch can be turned off to make it static, and there is no limitation on this.

[0035] S120: constructing a three-dimensional spatial structure of the drilling fluid based on the scanning data; the three-dimensional spatial structure represents a three-dimensional structure of pores with accumulated solid phase particles.

[0036] After acquiring the drilling fluid scan data, a corresponding 3D spatial structure can be constructed based on the scan data. Since the scan data can determine the internal structural appearance of the drilling fluid, the 3D spatial structure can be constructed to perform 3D geometric representation in subsequent processes.

[0037] Specifically, after acquiring the scan data, different drilling fluid components can be distinguished from the scan data. Drilling fluid components can include at least one of oil, water, a weighting agent, and a drilling fluid treatment agent. In actual applications, other components may also be included, which will not be discussed further here. The actual distinction operation can convert the scan data into a corresponding scanned image, such as a CT scan image, and then perform image processing based on the grayscale values ​​in the image to distinguish and identify the different components.

[0038] Exemplarily, the scanned image may also be pre-processed to ensure the accuracy of the recognition result.

[0039] After the drilling fluid components are identified, a three-dimensional spatial reconstruction of the drilling fluid phase can be performed based on the identified drilling fluid components to obtain three-dimensional drilling fluid phase data. The three-dimensional drilling fluid phase data can be data obtained by three-dimensional reconstruction based on the spatial positions of each component.

[0040] Accordingly, to ensure the effectiveness of subsequent processes, the 3D structure of the solid-phase pores within the drilling fluid phase space can be extracted from the 3D drilling fluid phase data to determine the specific values ​​of the drilling fluid parameters that influence the geometric morphology. Figure 2 shows a 3D image of the solid-phase pores within the drilling fluid. The 3D morphologies of the solid-phase pores with different pore structure types are then distinguished.

[0041] S130: Calculating parameter values ​​corresponding to geometric morphology influencing parameters according to the three-dimensional spatial structure.

[0042] The geometrical influencing parameters are corresponding features for describing the geometrical morphology of the drilling fluid, and specifically may be features for describing the geometrical morphology of the pore structure of the solid phase particles in the drilling fluid.

[0043] In some embodiments, the geometric morphology influencing parameters may include connectivity parameters, shape parameters, external shape parameters and Euler parameters; the connectivity parameters are the number of interconnected pores in the pore structure of solid-phase particles in the drilling fluid; the shape parameters are used to describe the regularity of the pore structure of solid-phase particles; the external shape parameters are the length ratio of the longest axis to the shortest axis of the pore structure of solid-phase particles in the drilling fluid; the Euler parameters are used to describe the complexity of the pore structure of solid-phase particles in the drilling fluid.

[0044] Correspondingly, the interconnection parameter can be determined by directly counting the number of interconnected pores in the pore structure formed by the accumulation of solid phase particles in the drilling fluid in the selected space in the drilling fluid, which can be expressed as C n express.

[0045] The shape parameter is the degree of closeness between the pore structure formed by the accumulation of solid particles in the drilling fluid in the selected space and the regular sphere, which can be obtained using the formula Calculate the shape parameter: G1 is the shape parameter, S is the surface area of ​​the pores formed by the accumulation of solid particles in the drilling fluid, and V is the volume of the pores formed by the accumulation of solid particles in the drilling fluid. The shape parameter of a regular sphere is 1. The smaller the volume of the microscopic pores formed by the accumulation of solid particles in the drilling fluid, the more regular the surface, and the closer the shape parameter is to 1. Conversely, for the same volume, the larger the surface area of ​​the pores formed by the accumulation of solid particles in the drilling fluid, the greater the degree of surface unevenness and the more irregular the morphology.

[0046] The shape parameter is the ratio of the longest axis length to the shortest axis length in a pore structure formed by the accumulation of solid particles in the drilling fluid. It can be calculated using the formula Calculate the shape factor, where G is the shape parameter, L is the longest axis length of the selected pore structure, and W is the shortest axis length of the selected pore structure. Under the accumulation of fine particles in high-density drilling fluid, the pore space becomes diverse. The smaller the shape parameter, the smaller the surface area of ​​the pore structure at the same volume, and the more regular its shape.

[0047] The Euler parameter, denoted by E, is an important parameter that measures the pore topology of the accumulation of solid particles in drilling fluid. For the Euler parameter E in three-dimensional space, it can be calculated using the formula E = 1 - b1 + b2, where E is the Euler parameter, β1 is the number of pore channels formed by the accumulation of solid particles in the drilling fluid within the selected space, and β2 is the number of closed pores formed by the accumulation of solid particles in the drilling fluid within the selected space. Therefore, within a given three-dimensional space, the smaller the Euler parameter, the greater the number of pore channels formed by the accumulation of solid particles in the drilling fluid, the fewer isolated closed pores, the better the connectivity, and the more complex the pore topology. When the Euler parameter is 1, the accumulation of solid particles in the drilling fluid does not form a pore structure.

[0048] Since the geometric morphology influencing parameters are mainly used to describe the geometric morphology of the pores of solid-phase particle accumulation, if there are other requirements in actual applications that require the use of other parameters to describe the pore structure of solid-phase particle accumulation, other geometric morphology influencing parameters can be set without restriction. Corresponding calculation methods can also be set to complete the calculation of the corresponding parameter values.

[0049] S140: Determine the pore structure type of the drilling fluid using the parameter value of the geometric morphology influencing parameter; the pore structure type is used to characterize the three-dimensional structure of the pores of the solid phase particles in the drilling fluid.

[0050] Pore ​​structure types are used to distinguish between solid particles based on their different geometric shapes. By identifying the pore structure type of drilling fluid, we can clarify its distinct characteristics and, in turn, tailor its composition to overcome density limitations during production applications.

[0051] In some embodiments, the pore structure type includes at least one of a clustered pore structure, a branched pore structure, a flat pore structure, and a closed pore structure. Different pore structure types have different characteristics, which can be quantitatively measured using parameters.

[0052] Specifically, as shown in Figure 3, the clustered pore structure is a pore structure in which the solid phase particles in the 3D reconstruction image of the drilling fluid CT scan are clearly continuous. n >5, shape parameter G1>2, Euler parameter E≤-1.

[0053] The branched pore structure is a distinct branched structure of the pores in the 3D reconstruction image of the drilling fluid CT scan, where 1≤connectivity parameter C n ≤5, shape parameter G1>2, Euler parameter E>-1.

[0054] The flat pore structure is a membrane-like structure in which the pores of solid phase particles are accumulated in the three-dimensional reconstruction image of the drilling fluid CT scan, with an external parameter G>8, a shape parameter G1<0.4, and an Euler parameter E>0.

[0055] The closed pore structure is a pore structure in which the pores of solid phase particles in the 3D reconstruction image of the drilling fluid CT scan are obviously closed and not connected with other pores. The more characteristic ones are spherical pore structure and columnar pore structure. n =1, 1≤shape parameter G≤8, Euler parameter E>0, shape parameter G1≤2, the pore structure is approximately spherical, and shape parameter G1>2, the pore structure is approximately columnar.

[0056] Different pore structure types have different spatial distribution characteristics. Based on the determined pore structure type, the specific geometric distribution characteristics of the drilling fluid can be determined, and then the addition of weighting particles can be adjusted as needed to optimize the characteristics of the drilling fluid.

[0057] When there are corresponding parameter definition ranges for different pore structure types, the quantitative classification of pore structure types can be completed based on the parameter definition ranges. Specifically, the parameter values ​​of the parameters affecting the geometric morphology of the drilling fluid can be directly compared with the parameter definition ranges of different pore structure types, and the specific parameter definition range and pore structure type corresponding to the drilling fluid can be determined based on the comparison results.

[0058] After determining the pore structure type of the drilling fluid, the morphology of the stacked pores of the solid particles in the drilling fluid is determined, that is, the characterization of the three-dimensional geometric form of the drilling fluid is achieved, and then the application of the drilling fluid in subsequent production can be determined according to the pore structure type.

[0059] It should be noted that, in addition to analyzing the drilling fluid, the method of the embodiment of the present disclosure can also analyze and process the completion fluid. The specific execution process is based on the above steps and will not be repeated here.

[0060] Let's use a specific scenario example to illustrate. First, prepare a high-density drilling fluid: based on a volume of water of 100 mL, add 2.0 g of anti-salt soil, 0.1 g of viscosity enhancer, 0.3 g of alkalinity regulator, 0.2 g of pH regulator, 5.0 g of shale inhibitor stabilizer, 5.0 g of high-temperature filtration reducer, 1.0 g of shale plugging agent, 2.0 g of high-temperature lubricant, 40.0 g of type I organic salt, 120.0 g of type II organic salt, and 255 g of barite, to prepare a density of 2.40 g / cm 3 High-density water-based drilling fluid.

[0061] Next, fill the CT scanning container: Take 20 mL of the prepared drilling fluid and inject it into the CT scanning container using a syringe pump. Set the CT scanning container temperature to 200°C, the pressure to 40 MPa, and the stirring speed to 0 rpm. Then, use a high-resolution CT scanner to perform a three-dimensional scan of the drilling fluid in the container cavity.

[0062] CT scan images were exported through the CT scanning operating system. ImagePro image processing software was then used to automatically identify grayscale differences and distinguish between oil, water, weighting agents, and other drilling fluid treatment materials. The edge-preserving filter module in ImagePro was then used to filter the scanned images of oil, water, weighting agents, and other drilling fluid treatment materials. The Otsu algorithm was then used to reconstruct the three-dimensional space of the drilling fluid components and extract the three-dimensional data of the pores within the solid-phase particles, forming a three-dimensional image of the pores within the drilling fluid.

[0063] Next, parameters were introduced to quantitatively describe the 3D structural morphology of the pores within the accumulation of solid particles. Combining CT scans with 3D reconstruction of the drilling fluid, four parameters were defined: connectivity parameter, shape parameter, form parameter, and Euler parameter. These parameters are used to qualitatively describe the 3D structural morphology of the pores within the accumulation of solid particles within the drilling fluid. By combining the aforementioned methods, the corresponding values ​​for different parameters were calculated. By combining the corresponding pore structure types with the parameter values, the pore structure type of the drilling fluid can be determined.

[0064] Through the introduction of the above embodiments and scenario examples, it can be seen that the method for characterizing the three-dimensional structure of the pores of the accumulated solid-phase particles in the drilling fluid obtains scanning data of the drilling fluid and uses the scanning data to complete the construction of the three-dimensional spatial structure of the drilling fluid. Based on the three-dimensional spatial structure, the parameter values ​​of the corresponding geometric morphology influencing parameters are calculated, and the pore structure type is determined using the corresponding parameter values ​​to complete the characterization of the three-dimensional structure of the pores of the accumulated solid-phase particles in the drilling fluid. Through the above method, the three-dimensional structure of the pores of the accumulated solid-phase particles in the drilling fluid is effectively characterized, so that the accumulation mode of the weighting agent particles in the drilling fluid can be optimized in subsequent applications, thereby breaking through the density limit of the drilling fluid, which is beneficial to the exploration and development of deep and ultra-deep layers.

[0065] Based on the aforementioned method for characterizing the 3D structure of pores formed by the accumulation of solid-phase particles in drilling fluid, the presently disclosed embodiments further provide a device for characterizing the 3D structure of pores formed by the accumulation of solid-phase particles in drilling fluid. The device can be executed by a corresponding computing device. As shown in Figure 4, the device can include the following specific modules.

[0066] The scanning data acquisition module 410 is used to acquire scanning data of the drilling fluid.

[0067] The three-dimensional spatial structure construction module 420 is used to construct the three-dimensional spatial structure of the drilling fluid based on the scanning data; the three-dimensional spatial structure represents the three-dimensional structure of the pores with accumulated solid phase particles.

[0068] The parameter value calculation module 430 is used to calculate the parameter value corresponding to the geometric morphology influencing parameter according to the three-dimensional spatial structure.

[0069] The pore structure type determination module 440 is used to determine the pore structure type of the drilling fluid using the parameter values ​​of the geometric morphology influencing parameters; the pore structure type is used to characterize the three-dimensional structure of the pores of the solid phase particles in the drilling fluid.

[0070] Based on the method for characterizing the three-dimensional structure of pores of solid-phase particles accumulated in drilling fluid corresponding to Figure 1, an embodiment of the present disclosure provides a device for characterizing the three-dimensional structure of pores of solid-phase particles accumulated in drilling fluid, which includes a memory and a processor.

[0071] In this embodiment, the memory can be implemented in any appropriate manner. The memory includes, but is not limited to, random access memory (RAM), read-only memory (ROM), cache, hard disk drive (HDD), memory card, etc. The computer storage medium stores computer program instructions. When the computer program instructions are executed, the program instructions or modules corresponding to the embodiment of FIG. 1 of the present disclosure are implemented.

[0072] In this embodiment, the processor can be implemented in any suitable manner. For example, the processor can take the form of a microprocessor or a processor and a computer-readable medium storing computer-readable program code (such as software or firmware) executable by the (micro)processor, a logic gate, a switch, an application-specific integrated circuit (ASIC), a programmable logic controller, an embedded microcontroller, etc. Specifically, when the processor is provided on a corresponding device, it can execute the method steps in the embodiment corresponding to FIG. 1 .

[0073] It should be noted that the method, device and equipment for characterizing the three-dimensional structure of pores of solid-phase particles in drilling fluid can be applied to the field of geological exploration and development technology, and can also be applied to other technical fields besides the field of geological exploration and development technology, without any limitation.

[0074] Although the process flows described above include multiple operations occurring in a particular order, it should be understood that these processes may include more or fewer operations, which may be performed sequentially or in parallel (eg, using parallel processors or a multi-threaded environment).

[0075] The present disclosure is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present disclosure. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device produce a device for implementing the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0076] These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce a product including an instruction device that implements the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0077] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0078] Those skilled in the art will appreciate that the embodiments of the present disclosure may be provided as methods, systems, or computer program products. Therefore, the embodiments of the present disclosure may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the embodiments of the present disclosure may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0079] The disclosed embodiments may be described in the general context of computer-executable instructions executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, and the like that perform specific tasks or implement specific abstract data types. The disclosed embodiments may also be practiced in distributed computing environments where tasks are performed by remote processing devices connected via a communications network. In a distributed computing environment, program modules may be located in local and remote computer storage media, including storage devices.

[0080] The various embodiments in this disclosure are described in a progressive manner. Similar or identical parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments. In particular, since the system embodiments are generally similar to the method embodiments, the description is relatively simple. For relevant parts, reference can be made to the partial description of the method embodiments. In the description of this disclosure, reference to the terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the disclosed embodiments. In this disclosure, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and integrate the different embodiments or examples described in this disclosure, as well as features of different embodiments or examples, without conflict.

[0081] The foregoing is merely an embodiment of the present disclosure and is not intended to limit the present disclosure. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure are intended to be included within the scope of the claims of the present disclosure.

Claims

1. A method for characterizing the three-dimensional structure of pores of solid-phase particles in drilling fluid, characterized in that: include: Obtaining scanning data of drilling fluid; constructing a three-dimensional spatial structure of the drilling fluid based on the scanning data; The three-dimensional spatial structure is characterized by a three-dimensional structure of pores with solid phase particles stacked; Calculating parameter values ​​corresponding to geometric morphology influencing parameters according to the three-dimensional spatial structure; Determining the pore structure type of the drilling fluid using the parameter value of the geometric morphology influencing parameter; The pore structure type is used to characterize the three-dimensional structure of the pores of the solid phase particles of the drilling fluid.

2. The method according to claim 1, characterized in that The drilling fluid includes high-density drilling fluid; the scanning data includes CT scanning data; and the scanning data includes scanning data of the drilling fluid in a flowing state and / or a static state.

3. The method according to claim 1, characterized in that The step of obtaining the scanning data of the drilling fluid comprises: Adjusting the pressure, temperature and stirring speed of the drilling fluid to be compatible with the target formation; The adjusted drilling fluid is scanned to obtain scanning data.

4. The method according to claim 1, characterized in that The constructing the three-dimensional spatial structure of the drilling fluid based on the scanning data comprises: Different drilling fluid components are distinguished in the scan data; the drilling fluid components include at least one of oil, water, a weighting agent and a drilling fluid treatment agent material; Reconstructing the three-dimensional space of the drilling liquid phase based on the identified drilling fluid components to obtain three-dimensional data of the drilling liquid phase; the three-dimensional data of the drilling liquid phase includes a three-dimensional image; The three-dimensional data of the solid phase particles in the drilling liquid phase space are stripped from the three-dimensional data of the drilling liquid phase; the three-dimensional data of the solid phase particles are used to describe the three-dimensional structural form of the pores of the solid phase particles.

5. The method according to claim 1, characterized in that The geometric morphology influencing parameters include at least one of the following: interconnection parameters, shape parameters, shape parameters and Euler parameters; the interconnection parameters are the number of interconnected pores in the pore structure of solid phase particles in the drilling fluid; the shape parameters are used to describe the regularity of the pore structure of solid phase particles; The shape parameter is the ratio of the longest axis to the shortest axis of the pore structure of solid phase particles in the drilling fluid; the Euler parameter is used to describe the complexity of the pore structure of solid phase particles in the drilling fluid.

6. The method according to claim 5, characterized in that The step of calculating the parameter value corresponding to the geometric influencing parameter according to the three-dimensional space structure includes: Using the formula Calculate the shape parameter, where G1 is the shape parameter, S is the surface area of ​​the pores formed by the accumulation of solid particles in the drilling fluid, and V is the volume of the pores formed by the accumulation of solid particles in the drilling fluid; Using the formula Calculate the shape factor, where G is the shape parameter, L is the longest axis length of the selected pore structure; W is the shortest axis length of the selected pore structure; The Euler parameter is calculated using the formula E=1-b1+b2, where E is the Euler parameter, β1 is the number of pores formed by the accumulation of solid particles in the drilling fluid in the selected space, and β2 is the number of closed pores formed by the accumulation of solid particles in the drilling fluid in the selected space.

7. The method according to claim 1, characterized in that The pore structure type includes at least one of a clustered pore structure, a branched pore structure, a flat pore structure and a closed pore structure.

8. The method according to claim 7, characterized in that Different pore structure types are pre-set with parameter definition ranges; the method of determining the pore structure type of the drilling fluid by using the parameter value of the geometric morphology influencing parameter includes: Determine a specific parameter definition range corresponding to the parameter value of the geometric influencing parameter; The pore structure type of the drilling fluid is determined according to the specific parameter definition range.

9. The method according to claim 8, characterized in that The parameter definition range corresponding to the clustered pore structure is the interconnection parameter C n >5, shape parameter G1>2, Euler parameter E≤-1; The parameter definition range corresponding to the branched pore structure is 1≤connection parameter C n ≤5, shape parameter G1>2, Euler parameter E>-1; The parameter definition range corresponding to the flat pore structure is shape parameter G>8, shape parameter G1<0.4, and Euler parameter E>0; The closed pore structure includes a spherical pore structure and a columnar pore structure; wherein the parameter definition range corresponding to the spherical pore structure is the connection parameter C n =1, 1≤ shape parameter G≤8, Euler parameter E>0, shape parameter G1≤2, the parameter definition range corresponding to the columnar pore structure is the connection parameter C n =1, 1≤shape parameter G≤8, Euler parameter E>0, G1>2.

10. A drilling fluid solid phase particle accumulation pore three-dimensional structure characterization device, characterized in that: include: A scanning data acquisition module, used to acquire scanning data of drilling fluid; A three-dimensional spatial structure building module, used to build a three-dimensional spatial structure of the drilling fluid based on the scanning data; The three-dimensional spatial structure is characterized by a three-dimensional structure of pores with solid phase particles stacked; A parameter value calculation module, used for calculating parameter values ​​corresponding to geometric morphology influencing parameters according to the three-dimensional space structure; A pore structure type determination module, used to determine the pore structure type of the drilling fluid using the parameter value of the geometric morphology influencing parameter; The pore structure type is used to characterize the three-dimensional structure of the pores of the solid phase particles of the drilling fluid.

11. A drilling fluid solid phase particle accumulation pore three-dimensional structure characterization device, characterized in that: The method comprises a memory and a processor; the memory is used to store computer programs / instructions; and the processor is used to execute the computer programs / instructions to implement the method according to any one of claims 1 to 9.

Images