Drilling fluid solid-phase particle accumulation pore three-dimensional structure characterization method, device and equipment

Abstract

The embodiment of the invention provides a characterization method, device and equipment for a three-dimensional structure of a solid-phase particle accumulation pore of a drilling fluid, and is applied to the field of geological exploration and development. The method comprises the following steps: acquiring scanning data of drilling fluid; constructing a three-dimensional space structure of the drilling fluid based on the scanning data; a three-dimensional structure with solid-phase particle accumulation pores is represented in the three-dimensional space structure; calculating parameter values corresponding to geometrical morphology influence parameters according to the three-dimensional space structure; determining the pore structure type of the drilling fluid by using the parameter values of the geometrical morphology influence parameters; the pore structure type is used for representing a three-dimensional structure of the drilling fluid solid-phase particle accumulation pores. According to the method, the three-dimensional structure of the solid-phase particle accumulation pores in the drilling fluid is effectively represented, so that the weighting agent particle accumulation mode in the drilling fluid can be optimized in subsequent application, the density limit of the drilling fluid is broken through, and deep and ultra-deep exploration and development are facilitated.

Description

Technical Field

[0001] The embodiments of this specification relate to the field of geological exploration and development technology, and in particular to a method, device and equipment for characterizing the three-dimensional structure of pores of solid-phase particle accumulation in drilling fluid. Background Art

[0002] With the continuous deepening of geological exploration and development, we have entered a stage of development that emphasizes both conventional and unconventional resources. Due to the huge reserves of unconventional oil and gas resources that have been proven in deep and ultra-deep layers, the development of unconventional oil and gas exploration is moving towards deeper, hotter and higher-pressure areas in the earth. In this context, high-density drilling fluid systems have the advantages of balancing high formation pressure, ensuring downhole pressure and improving wellbore stability, and are key technologies for exploration and development based on deep and ultra-deep wells.

[0003] In order to meet different construction requirements, additional weighting materials may be added to high-density drilling fluids to adjust the density limit of the drilling fluid. However, different types of weighting agents differ in microscopic morphology, particle size, specific surface area, force, contact support effect, etc. In order to meet the development needs of deep wells and ultra-deep wells, it is necessary to effectively optimize the stacking mode of weighting agent particles in high-density drilling fluids to break the limit of drilling fluid density improvement.

[0004] Therefore, how to determine the accumulation mode of weighting agent particles in drilling fluid is the key in the drilling and development process. However, drilling fluid belongs to a multi-component liquid phase system, each component is in a dynamically stable state, and is affected by relevant conditions during the construction process. At present, there is a lack of effective means to characterize the three-dimensional structure of the accumulation pores of solid phase particles in drilling fluid. Therefore, there is an urgent need for a solution that can accurately and effectively characterize the three-dimensional structure of the dynamic accumulation pores of solid phase particles in drilling fluid. Summary of the invention

[0005] The purpose of the embodiments of this specification is to provide a method, device and equipment for characterizing the three-dimensional structure of pores of solid-phase particles in drilling fluid, so as to solve the problem of how to accurately and effectively characterize the three-dimensional structure of pores of dynamic accumulation of solid-phase particles in drilling fluid.

[0006] In order to solve the above technical problems, an embodiment of the present specification proposes a method for characterizing the three-dimensional structure of pores accumulated by solid phase particles in drilling fluid, comprising: acquiring scanning data of drilling fluid; constructing a three-dimensional spatial structure of the drilling fluid based on the scanning data; characterizing the three-dimensional structure of pores accumulated by 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 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 pores accumulated by solid phase particles in the drilling fluid.

[0007] In some embodiments, the drilling fluid includes high-density high-solid 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.

[0008] In some embodiments, the obtaining of the 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 the scanning data.

[0009] In some embodiments, constructing the three-dimensional spatial structure of the drilling fluid based on the 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 drilling liquid phase data; 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.

[0010] In some embodiments, the geometric morphology influencing parameters include at least one of the following: connectivity parameters, shape parameters, appearance 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 appearance parameters are the 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.

[0011] Based on the above implementation, the parameter value corresponding to the geometric morphology influencing parameter is calculated according to the three-dimensional space structure, including: using the formula Calculate the shape parameter, where G 1 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; use the formula E = 1-β 1 +β 2 Calculate the Euler parameters, where E is the Euler parameter, β 1 is the number of pores formed by the accumulation of solid particles in the drilling fluid in the selected space, β 2 It is the number of closed pores formed by the accumulation of solid particles in the drilling fluid in the selected space.

[0012] In some embodiments, the aqueous phase type includes at least one of a clustered pore structure, a branched pore structure, a flat pore structure, and a closed pore structure.

[0013] Based on the above implementation, different water phase types are pre-set with parameter definition ranges; the method of determining the pore structure type of the drilling fluid using the parameter value of the geometric morphology influencing parameter includes: determining a specific parameter definition range corresponding to the parameter value of the geometric morphology influencing parameter; and determining the pore structure type of the drilling fluid according to the specific parameter definition range.

[0014] Based on the above implementation, the parameter definition range corresponding to the clustered pore structure is the interconnection parameter C n >5, shape parameter G 1 >2, Euler parameter E≤-1; the parameter definition range corresponding to the branched pore structure is 1≤connection parameter C n ≤5, shape parameter G 1 >2, Euler parameter E>-1; the parameter definition range corresponding to the flat pore structure is the shape parameter G>8, the shape parameter G 1 <0.4, 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 G 1 ≤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, G 1 >2.

[0015] The embodiments of the present specification also propose 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 the three-dimensional space structure of the drilling fluid based on the scanning data; a three-dimensional structure characterizing a water phase droplet 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 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 pores of accumulated solid-phase particles in the drilling fluid.

[0016] The embodiments of this specification also propose a three-dimensional structure characterization device for the pores of the accumulated solid phase particles of the drilling fluid, including a memory and a processor; the memory is used to store computer programs / instructions; the processor is used to execute the computer programs / instructions to implement the above-mentioned three-dimensional structure characterization method for the pores of the accumulated solid phase particles of the drilling fluid.

[0017] It can be seen from the technical solutions provided in the above embodiments of this specification that the method for characterizing the three-dimensional structure of the pores of the accumulation of solid phase particles in the drilling fluid in the embodiments of this specification obtains the 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 using the corresponding parameter values ​​to determine the pore structure type and complete the characterization of the three-dimensional structure of the pores of the accumulation of solid phase particles in the drilling fluid. Through the above method, the three-dimensional structure of the pores of the accumulation of 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 conducive to the exploration and development of deep and ultra-deep layers. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is a schematic diagram of a process for characterizing the three-dimensional structure of pores of a drilling fluid solid phase particle stacking method according to an embodiment of this specification;

[0020] Figure 2 This is a schematic diagram of the spatial distribution of a water phase geometric form in an embodiment of this specification;

[0021] Figure 3 This is a schematic diagram of parameters of different water phase types according to the embodiments of this specification;

[0022] Figure 4 This 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 this specification. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of this specification to clearly and completely describe the technical solutions in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this specification.

[0024] In order to solve the above technical problems, the present specification proposes a method for characterizing the three-dimensional structure of the pores of the solid phase particles in the drilling fluid. The method can be executed by a corresponding computing device, which includes but is not limited to a server, an industrial computer, a PC, etc. Figure 1 As shown, the method for characterizing the three-dimensional structure of pores of solid-phase particles in drilling fluid includes the following specific implementation steps.

[0025] S110: Obtaining scanning data of drilling fluid.

[0026] 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 the face of deep well and ultra-deep well construction needs, it is necessary to add fine particles such as barite, iron ore powder, micro-manganese ore, and ferro-titanium 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 used 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-micro barite, micro-manganese, and ultra-micro 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 .

[0027] 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 cannot be used as an emergency prevention measure to effectively control overflows and prevent blowouts. In addition, different types of weighting agents differ in many aspects such as microscopic morphology, particle size, specific surface area, force, contact support effect, etc. The key to optimizing the accumulation mode of weighting agent particles in high-density drilling fluid is to select suitable weighting agent particles to fill the accumulated pore space, reduce the accumulated pore space between particles, and thus achieve the purpose of increasing the ultimate density of the drilling fluid. However, due to the fact 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 mechanical stirring, drill bit water jet and other shear conditions, there is still no effective means to characterize the three-dimensional structure of the accumulated pores of solid phase particles in drilling fluid, and there is a lack of scientific guidance methods to improve the weighting limit.

[0028] 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.

[0029] In order to accurately determine the three-dimensional geometric form of the water phase of the drilling fluid, it is first necessary to obtain the scanning data of the drilling fluid. The 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 scanning data or other types of scanning data, which are not limited to this.

[0030] In some embodiments, the drilling fluid targeted may be a high-density drilling fluid, and accordingly, the high-density drilling fluid may be pre-configured according to requirements.

[0031] 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, according to the scanning requirements, the pressure, temperature and stirring speed of the drilling fluid can be adjusted. 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, without limitation.

[0032] S120: constructing a three-dimensional spatial structure of the drilling fluid based on the scanning data; the three-dimensional spatial structure characterizes a three-dimensional structure of pores in which solid phase particles are accumulated.

[0033] After obtaining the scanning data of the drilling fluid, the corresponding three-dimensional space structure can be constructed according to the scanning data. Since the scanning data can determine the internal structure appearance of the drilling fluid, after the three-dimensional space structure is constructed, the three-dimensional geometric form representation in the subsequent process can be performed.

[0034] Specifically, after the scanning data is obtained, different drilling fluid components in the drilling fluid can be distinguished from the scanning data. The drilling fluid components can include at least one of oil, water, weighting agent and drilling fluid treatment agent materials. In actual applications, other components may also be included, which will not be described in detail here. The actual distinction operation can convert the scanning data into a corresponding scanning image, such as a CT scanning image, and then perform image processing according to the gray value in the image to complete the distinction and identification of different components.

[0035] Preferably, the scanned image may also be preprocessed to ensure the accuracy of the recognition result.

[0036] After the drilling fluid components are identified, the drilling fluid phase 3D spatial reconstruction can be performed based on the identified drilling fluid components to obtain drilling fluid phase 3D data. The drilling fluid phase 3D data can be data obtained after 3D reconstruction based on the spatial positions of each component.

[0037] Accordingly, in order to ensure the effectiveness of the subsequent process, the three-dimensional structure of the pores of the solid phase particles in the drilling liquid phase space can be stripped from the three-dimensional data of the drilling liquid phase to determine the specific parameter values ​​of the drilling fluid corresponding to the geometric morphology influencing parameters. Figure 2 As shown, it is a three-dimensional image of the pores of solid-phase particles in the drilling fluid, and accordingly, the three-dimensional morphologies of the pores of solid-phase particles in different forms are distinguished in combination with different pore structure types.

[0038] S130: Calculating parameter values ​​corresponding to geometric influencing parameters according to the three-dimensional spatial structure.

[0039] The geometrical influencing parameters are corresponding characteristics for describing the geometrical morphology of the drilling fluid, and specifically may be characteristics for describing the geometrical morphology of the water phase droplets therein.

[0040] In some embodiments, the geometric morphology influencing parameters may include connectivity parameters, shape parameters, appearance parameters and Euler parameters; the connectivity parameters are the number of interconnected pores in the solid phase particle accumulation pore structure in the drilling fluid; the shape parameters are used to describe the regularity of the solid phase particle accumulation pore structure; the appearance parameters are the length ratio of the longest axis to the shortest axis of the solid phase particle accumulation pore structure in the drilling fluid; the Euler parameters are used to describe the complexity of the solid phase particle accumulation pore structure in the drilling fluid.

[0041] 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.

[0042] The shape parameter is the degree of closeness between the pore structure morphology formed by the accumulation of solid particles in the drilling fluid in the selected space and a regular sphere. It can be calculated using the formula Calculate the shape parameter, where G 1 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 microscopic volume of the pores formed by the accumulation of solid particles in the drilling fluid, the more regular the surface, and the closer its shape parameter is to 1. On the contrary, under 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 concavity and convexity change, and the more irregular the shape.

[0043] 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 of high-density drilling fluid, the pore space is diversified. The smaller the shape parameter, the smaller the surface area of ​​the pore structure under the same volume, and the more regular its shape.

[0044] The Euler parameter is an important parameter to measure the topological structure of the pores of the solid phase particles in the drilling fluid. It is represented by E. For the Euler parameter E in three-dimensional space, the formula E = 1-β can be used. 1 +β 2 Calculate the Euler parameters, where E is the Euler parameter, β 1 is the number of pores formed by the accumulation of solid particles in the drilling fluid in the selected space, β 2 It is the number of closed pores formed by the accumulation of solid particles in the drilling fluid in the selected space. Therefore, in a certain three-dimensional space, the smaller the Euler parameter is, the more channels are formed by the accumulation of solid particles in the drilling fluid, the fewer isolated closed pores are, the better the connectivity is, and the more complex the topological structure of the pores is. When the Euler parameter is 1, the accumulation of solid particles in the drilling fluid does not form a pore structure.

[0045] Since the geometric morphology influencing parameters are mainly used to describe the geometric morphology of the pores of the solid phase particle stacking, if there are other requirements in practical applications that require the use of other parameters to describe the aqueous phase droplets, other geometric morphology influencing parameters can be set without restriction, and corresponding calculation methods can also be set to complete the calculation of the corresponding parameter values.

[0046] 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.

[0047] The pore structure type is used to distinguish the solid particles according to their different geometric forms. By identifying the pore structure type of the drilling fluid, the different characteristics of the drilling fluid can be clarified, and then the composition of the drilling fluid can be adjusted in a targeted manner in production applications to break through the density limit.

[0048] 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.

[0049] Specifically, Figure 3As shown in the figure, the clustered pore structure is a pore structure in which the pores of solid phase particles in the three-dimensional reconstruction image of the drilling fluid CT scan are obviously continuous. n >5, shape parameter G 1 >2, Euler parameter E≤-1.

[0050] The branched pore structure is a distinct branched structure of the pores of solid phase particles in the 3D reconstruction image of the drilling fluid CT scan, 1≤connectivity parameter C n ≤5, shape parameter G 1 >2, Euler parameter E>-1.

[0051] The flat pore structure is a membrane-like structure in which the solid particles are piled up in the 3D reconstruction image of the drilling fluid CT scan. The shape parameter G>8 and the shape parameter G 1 <0.4, Euler parameter E>0.

[0052] The closed pore structure is the pores of solid phase particles in the 3D reconstruction image of the drilling fluid CT scan, which are obviously closed and not connected with other pores. The more characteristic ones are the spherical pore structure and the columnar pore structure. n =1, 1≤ shape parameter G≤8, Euler parameter E>0, shape parameter G 1 When ≤2, the pore structure is approximately spherical, and the shape parameter G 1 When >2, the pore structure is approximately columnar.

[0053] Different pore structure types have different spatial distribution characteristics. The specific geometric distribution characteristics of the drilling fluid can be determined based on the determined pore structure type, and then the addition of weighting particles can be adjusted as needed to optimize the properties of the drilling fluid.

[0054] 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 according to the comparison results.

[0055] 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.

[0056] It should be noted that, in addition to analyzing the drilling fluid, the method of the embodiment of this specification can also analyze and process the completion fluid. The specific execution process is based on the above steps and will not be repeated here.

[0057] Let's use a specific scenario example to illustrate. First, prepare a high-density drilling fluid: based on the volume of water as 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 resistant fluid loss reducer, 1.0 g of shale plugging agent, 2.0 g of high-temperature resistant lubricant, 40.0 g of type I organic salt, 120.0 g of type II organic salt, and 255 g of barite, and the prepared density is 2.40 g / cm 3 High-density water-based drilling fluid.

[0058] Then fill the CT scanning container: take 20mL of the drilling fluid prepared above, use a syringe pump to inject the drilling fluid into the CT scanning container, adjust and set the CT scanning container temperature to 200°C, the pressure to 40MPa, and the stirring speed to 0rpm. Then turn on the high-resolution CT scanner to perform a three-dimensional scan of the drilling fluid in the container cavity.

[0059] The CT scan images were exported through the CT scanning operating system, and the grayscale differences of the images were automatically identified using the ImagePro image processing software to distinguish between oil, water, weighting agents and other drilling fluid treatment materials. The edge-preserving filter module in the ImagePro image processing software 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 each component of the drilling fluid, and the three-dimensional data of the pores of the solid phase particle accumulation was extracted to form a three-dimensional image of the pores of the solid phase particle accumulation in the drilling fluid.

[0060] After that, the parameters for quantitatively describing the three-dimensional structural morphology of the pores of the solid-phase particles are introduced. Combining the results of CT scanning and three-dimensional reconstruction of drilling fluid, four parameters, namely the connectivity parameter, shape parameter, appearance parameter and Euler parameter of the pore structure of the solid-phase particles in the drilling fluid, are defined to qualitatively describe the three-dimensional structural morphology of the pores of the solid-phase particles in the drilling fluid. Combining the above method, the corresponding parameter values ​​are calculated for different parameters, and then combined with the water phase type corresponding to the parameter value, the water phase type of the drilling fluid can be determined.

[0061] Through the introduction of the above embodiments and scenario examples, it can be seen that the three-dimensional structure characterization method of the pores of the accumulation of solid phase particles in the drilling fluid obtains the 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 using the corresponding parameter values ​​to determine the pore structure type and complete the characterization of the three-dimensional structure of the pores of the accumulation of solid phase particles in the drilling fluid. Through the above method, the three-dimensional structure of the pores of the accumulation of 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 conducive to the exploration and development of deep and ultra-deep layers.

[0062] Based on the above-mentioned drilling fluid solid phase particle accumulation pore three-dimensional structure characterization method, this specification also proposes a drilling fluid solid phase particle accumulation pore three-dimensional structure characterization device. The execution body of the drilling fluid solid phase particle accumulation pore three-dimensional structure characterization device can be a corresponding computing device. Figure 4 As shown, the drilling fluid solid phase particle accumulation pore three-dimensional structure characterization device may include the following specific modules.

[0063] The scanning data acquisition module 410 is used to acquire the scanning data of the drilling fluid.

[0064] The three-dimensional space structure construction module 420 is used to construct the three-dimensional space structure of the drilling fluid based on the scanning data; the three-dimensional space structure represents the three-dimensional structure of the water phase droplets.

[0065] 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 space structure.

[0066] The pore structure type determination module 440 is 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 in the drilling fluid.

[0067] based on Figure 1 The corresponding method for characterizing the three-dimensional structure of pores of the accumulated solid phase particles of the drilling fluid, the embodiment of this specification provides a three-dimensional structure characterization device for characterizing the pores of the accumulated solid phase particles of the drilling fluid, and the device includes a memory and a processor.

[0068] In this embodiment, the memory may 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 present specification is implemented. Figure 1 The program instructions or modules of the corresponding embodiment.

[0069] In this embodiment, the processor may be implemented in any suitable manner. For example, the processor may take the form of a microprocessor or a processor and a computer-readable medium storing a 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, and an embedded microcontroller, etc. Specifically, the processor may execute when it is set on a corresponding device. Figure 1 The method steps in the corresponding embodiments.

[0070] 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 except the field of geological exploration and development technology, without any limitation.

[0071] Although the process flows described above include multiple operations that occur in a particular order, it should be clearly understood that the processes may include more or fewer operations, which may be performed sequentially or in parallel (eg, using parallel processors or a multi-threaded environment).

[0072] The present application 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 specification. 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 generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0073] These computer program instructions may also be stored in a computer-readable memory capable of directing 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 an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0074] 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, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0075] Those skilled in the art will appreciate that the embodiments of this specification may be provided as methods, systems or computer program products. Therefore, the embodiments of this specification may take the form of complete hardware embodiments, complete software embodiments or embodiments combining software and hardware. Moreover, the embodiments of this specification may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0076] The present specification 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, etc. that perform specific tasks or implement specific abstract data types. The present specification embodiments may also be practiced in distributed computing environments where tasks are performed by remote processing devices connected through a communication network. In a distributed computing environment, program modules may be located in local and remote computer storage media, including storage devices.

[0077] Each embodiment in this specification is described in a progressive manner, and the same and similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. In the description of this specification, the description of the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of this specification. In this specification, the schematic representation of the above terms does not necessarily target the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, in the absence of contradiction, a person skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0078] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A method for characterizing the three-dimensional structure of pores in the solid phase of drilling fluid particles. It is 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, It is 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, It is 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, It is 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, It is 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, It is 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 G 1 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; Using the formula E = 1-β 1 +β 2 Calculate the Euler parameters, where E is the Euler parameter, β 1 is the number of pores formed by the accumulation of solid particles in the drilling fluid in the selected space, β 2 It 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, It is 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, It is characterized in that Different water phase types are pre-set with parameter definition ranges; the method of determining the pore structure type of the drilling fluid 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, It is characterized in that The parameter definition range corresponding to the clustered pore structure is the connection parameter C n >5, shape parameter G 1 >2, Euler parameter E≤-1; The parameter definition range corresponding to the branched pore structure is 1≤connection parameter C n ≤5, shape parameter G 1 >2, Euler parameter E>-1; The parameter definition range corresponding to the flat pore structure is that the shape parameter G>8, the shape parameter G 1 <0.4, 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 G 1 ≤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, G 1 >2.

10. A drilling fluid solid phase particle accumulation pore three-dimensional structure characterization device, It is 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, It is 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.

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