A method and apparatus for determining changes in rock mechanical properties

Abstract

This application provides a method and apparatus for determining changes in the mechanical properties of rock. The method includes: obtaining a full-diameter core sample; obtaining the mechanical properties of the full-diameter core sample as a first mechanical property; performing rock-breaking operations on the full-diameter core sample to obtain rock cuttings; obtaining the mechanical properties of the rock cuttings as a second mechanical property; soaking the rock cuttings in drilling fluid to obtain soaked rock cuttings; obtaining the mechanical properties of the soaked rock cuttings as a third mechanical property; determining the changes in mechanical properties before and after rock breaking based on the first and second mechanical properties; and determining the changes in mechanical properties before and after soaking in drilling fluid based on the second and third mechanical properties. This solution solves the technical problem of low drilling efficiency caused by the failure to effectively consider changes in mechanical properties before and after rock breaking and before and after soaking in drilling fluid, thus achieving a significant improvement in drilling efficiency.

Description

Technical Field

[0001] This application belongs to the field of drilling technology, and particularly relates to a method for determining rock breaking and changes in mechanical properties before and after drilling fluid immersion based on nanoindentation testing. Background Technology

[0002] With the continuous development of petroleum exploration and recovery technologies, the main problems that petroleum technology needs to solve are: difficulty in finding new reservoirs, rapid decline in production from developed reservoirs, difficulty in drilling sulfur-bearing wells, deep wells and complex terrain conditions, high levels of exploration and development in various blocks, fierce competition in the exploration and recovery market, increasing energy demand, and continuously improving environmental standards.

[0003] With the continuous exploitation of oil and gas resources, drilling technology and drilling fluid technology are also constantly developing. The existing drilling technologies mainly include horizontal well drilling technology and multi-branch well drilling technology. The existing drilling fluids mainly include water-based drilling fluid and oil-based drilling fluid.

[0004] The mechanical properties of rocks change due to drilling and the soaking effect of drilling fluid. If the changes in the mechanical properties of rocks during drilling can be accurately determined, drilling technology can be effectively improved and the recovery rate can be increased.

[0005] There is currently no effective solution for determining the changes in mechanical properties before and after rock breaking and before and after drilling fluid soaking. Summary of the Invention

[0006] The purpose of this application is to provide a method and apparatus for determining changes in the mechanical properties of rocks, which can accurately and efficiently determine the changes in mechanical properties before and after rock breaking and before and after soaking in drilling fluid, thereby improving drilling efficiency.

[0007] This application provides a method and apparatus for determining changes in the mechanical properties of rocks, which are achieved as follows:

[0008] A method for determining changes in the mechanical properties of rocks, the method comprising:

[0009] Obtain full-diameter cores;

[0010] Obtain the mechanical properties of the full-diameter core sample, and use them as the first mechanical property.

[0011] The full-diameter core was subjected to rock-breaking operation to obtain rock fragments.

[0012] The mechanical properties of the rock fragments after rock breaking are obtained as the second mechanical property;

[0013] The rock cuttings after rock breaking are soaked in drilling fluid to obtain soaked rock cuttings;

[0014] The mechanical properties of the soaked rock fragments were obtained as the third mechanical property.

[0015] Based on the first mechanical property and the second mechanical property, determine the changes in mechanical properties before and after rock breaking;

[0016] Based on the second and third mechanical properties, the changes in mechanical properties of the rock before and after immersion in drilling fluid are determined.

[0017] In one embodiment, the mechanical properties of the rock fragments after rock breaking are obtained as a second mechanical property, including:

[0018] A rigid indenter with a regular shape is pressed into the surface of the rock fragments after rock breaking under gradually increasing external force;

[0019] After the external force or displacement reaches the predetermined peak value, the external force is gradually removed;

[0020] During the process of applying pressure and removing external force, obtain the curves of the displacement of the indenter and the load borne by the indenter.

[0021] Based on the change curve, the mechanical properties of the rock fragments after rock breaking are determined.

[0022] In one embodiment, the second mechanical property includes at least one of the following: elastic modulus and hardness.

[0023] In one embodiment, after performing rock-breaking operations on the full-diameter core to obtain rock fragments, the method further includes:

[0024] The mineral composition of the rock fragments after rock breaking was obtained by performing compositional analysis.

[0025] Microstructure scanning was performed on the rock fragments after rock breaking to obtain the fracture development characteristics of the rock fragments after rock breaking;

[0026] The mineral composition and fracture development characteristics are used to determine the influence of mineral composition and fracture development characteristics on mechanical properties by combining the first mechanical property and the second mechanical property.

[0027] In one embodiment, the rock cuttings after rock breaking are soaked in drilling fluid to obtain soaked rock cuttings, including:

[0028] Get multiple preset durations;

[0029] According to the preset multiple time periods, the rock-broken debris is soaked by a self-absorbing soaking method to obtain debris at different saturation stages.

[0030] In one implementation, the plurality of durations are selected between 24 hours and 96 hours.

[0031] In one implementation, obtaining a full-diameter core includes:

[0032] The full-diameter core was obtained by drilling at the well site using drilling equipment.

[0033] A device for determining changes in the mechanical properties of rocks, comprising:

[0034] The first acquisition module is used to acquire full-diameter core samples;

[0035] The second acquisition module is used to acquire the mechanical properties of the full-diameter core as the first mechanical property;

[0036] The rock-breaking module is used to break the rock core of the full diameter to obtain rock fragments.

[0037] The third acquisition module is used to acquire the mechanical properties of the rock fragments after rock breaking, as the second mechanical property;

[0038] The soaking module is used to soak the rock cuttings after rock breaking with drilling fluid to obtain soaked rock cuttings;

[0039] The fourth acquisition module is used to acquire the mechanical properties of the soaked rock fragments as the third mechanical property.

[0040] The first determining module is used to determine the changes in mechanical properties before and after rock breaking based on the first mechanical property and the second mechanical property;

[0041] The second determining module is used to determine the changes in the mechanical properties of the rock before and after immersion in drilling fluid, based on the second mechanical property and the third mechanical property.

[0042] An electronic device includes a processor and a memory for storing processor-executable instructions, wherein the processor, when executing the instructions, implements the steps of the method described above.

[0043] A computer-readable storage medium having a computer program / instructions stored thereon, which, when executed by a processor, implement the steps of the above-described method.

[0044] The method for determining changes in rock mechanical properties provided in this application obtains the mechanical properties of full-diameter core samples, the mechanical properties of rock cuttings after rock breaking, and the mechanical properties of rock cuttings after soaking. This allows for the determination of changes in the mechanical properties of the rock before and after rock breaking and before and after soaking in drilling fluid. This solves the existing technical problem of low drilling efficiency caused by the failure to effectively consider changes in the mechanical properties of the rock before and after rock breaking and before and after soaking in drilling fluid, and achieves the technical effect of effectively improving drilling efficiency. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 This is a flowchart of one embodiment of the method for determining changes in rock mechanical properties provided in this application;

[0047] Figure 2 This is a flowchart of a method for determining the changes in mechanical properties of rock before and after rock breaking and drilling fluid immersion, provided in this application.

[0048] Figure 3 This is a hardware structure block diagram of an electronic device for a method of determining changes in rock mechanical properties provided in this application;

[0049] Figure 4 This is a schematic diagram of the module structure of one embodiment of the device for determining changes in rock mechanical properties provided in this application. Detailed Implementation

[0050] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application.

[0051] Figure 1 This is a flowchart of one embodiment of the method for determining changes in rock mechanical properties provided in this application. Although this application provides method operation steps or apparatus structures as shown in the following embodiments or figures, more or fewer operation steps or module units may be included in the method or apparatus based on conventional or non-inventive effort. In steps or structures where there is no logically necessary causal relationship, the execution order of these steps or the module structure of the apparatus is not limited to the execution order or module structure described in the embodiments and figures of this application. When the method or module structure is applied in actual devices or end products, it can be executed sequentially or in parallel according to the method or module structure shown in the embodiments or figures (e.g., in a parallel processor or multi-threaded processing environment, or even a distributed processing environment).

[0052] Specifically, such as Figure 1As shown, the method for determining the changes in rock mechanical properties described above may include the following steps:

[0053] Step 101: Obtain a full-diameter core;

[0054] For example, a full-diameter core sample can be obtained by drilling at the well site using sampling equipment, which can then be used as the basis for research.

[0055] Step 102: Obtain the mechanical properties of the full-diameter core sample, which will be used as the first mechanical property.

[0056] In practice, a rigid indenter with a regular shape can be pressed into the surface of a full-diameter core under gradually increasing external force; after the external force or displacement reaches a predetermined peak, the external force is gradually removed; during the process of applying pressure and removing external force, the change curves of the indenter displacement and the load borne by the indenter are obtained; based on the change curves, the mechanical properties of the full-diameter core are determined.

[0057] Step 103: Perform rock breaking operation on the full-diameter core to obtain rock fragments after rock breaking;

[0058] To ensure the accuracy of the test results, when performing rock breaking operations on full-diameter core samples, the same drill bit used in the drilling site can be used to simulate the field conditions as realistically as possible and determine the impact of rock breaking on mechanical properties.

[0059] Step 104: Obtain the mechanical properties of the rock fragments after rock breaking, as the second mechanical property;

[0060] Specifically, a rigid indenter with a regular shape can be pressed into the surface of the rock fragments after rock breaking under gradually increasing external force; after the external force or displacement reaches a predetermined peak, the external force is gradually removed; during the process of applying pressure and removing external force, the change curves of the indenter displacement and the load borne by the indenter are obtained; based on the change curves, the mechanical properties of the rock fragments after rock breaking are determined.

[0061] For example, during the loading-unloading process, the displacement h of the indenter and the load P borne by the indenter can be recorded using high-precision load-displacement testing technology. By analyzing the obtained Ph curve, the mechanical properties parameters such as the elastic modulus and hardness of the sample under test can be obtained.

[0062] Step 105: Soak the rock cuttings after rock breaking with drilling fluid to obtain soaked rock cuttings;

[0063] To ensure the accuracy of test results, drilling fluid obtained from the drilling site can be used when soaking the rock cuttings to accurately recreate the drilling scene and improve the accuracy of the final results.

[0064] Step 106: Obtain the mechanical properties of the soaked rock fragments as the third mechanical property;

[0065] Specifically, a rigid indenter with a regular shape can be pressed into the surface of the soaked rock cuttings under gradually increasing external force; after the external force or displacement reaches a predetermined peak, the external force is gradually removed; during the process of applying pressure and removing external force, the change curves of the indenter displacement and the load borne by the indenter are obtained; based on the change curves, the mechanical properties of the soaked rock cuttings are determined.

[0066] Step 107: Determine the changes in mechanical properties before and after rock breaking based on the first mechanical property and the second mechanical property;

[0067] Step 108: Determine the changes in mechanical properties of the rock before and after soaking in drilling fluid based on the second mechanical property and the third mechanical property.

[0068] Among them, the above-mentioned mechanical properties may include, but are not limited to, at least one of the following: elastic modulus and hardness.

[0069] In the example above, by obtaining the mechanical properties of the full-diameter core, the mechanical properties of the rock cuttings after rock breaking, and the mechanical properties of the rock cuttings after soaking, the changes in mechanical properties before and after rock breaking and before and after soaking in drilling fluid can be determined. This solves the existing technical problem of low drilling efficiency caused by the failure to effectively consider the changes in mechanical properties before and after rock breaking and before and after soaking in drilling fluid, and achieves the technical effect of effectively improving drilling efficiency.

[0070] To better analyze the influence of rock breaking and drilling fluid on mechanical properties, whole-rock analysis and thin-section castings can be performed on cores or cuttings to determine the total amount of clay minerals and the content of non-clay minerals in the core, clarify the core's structure, intergranular filling type, and pore type, thereby allowing for comparison of the compositional distribution and microstructural characteristics of full-diameter cores with fragments of different particle sizes, shapes, and colors.

[0071] Specifically, the mineral composition of the broken rock fragments can be obtained by performing compositional analysis on the full-diameter core and the broken rock fragments. The mineral composition may include: total clay mineral content and non-clay mineral content. The broken rock fragments can also be subjected to microstructure scanning to obtain the fracture development characteristics. The fracture development characteristics may include: structural features, intergranular filling material type, and pore type. The mineral composition and fracture development characteristics are used in conjunction with the first mechanical property and the second mechanical property to determine the influence of the mineral composition and fracture development characteristics on the mechanical properties.

[0072] To conduct a more comprehensive analysis of the mechanical properties of core samples and cuttings, a self-priming soaking method can be used with drilling fluid. The soaking time can be selected between 24 and 96 hours to ensure that the cuttings are at different saturation stages, thereby more accurately characterizing the effect of drilling fluid soaking on the mechanical properties of the cuttings. In one embodiment, soaking the rock-broken cuttings with drilling fluid to obtain soaked cuttings may include: obtaining multiple preset time periods; soaking the rock-broken cuttings with a self-priming soaking method according to the multiple preset time periods to obtain cuttings at different saturation stages.

[0073] The above method will be described below with reference to a specific embodiment. However, it is worth noting that this specific embodiment is only for better illustration of this application and does not constitute an improper limitation of this application.

[0074] In this example, to investigate the effects of rock breaking and drilling fluid immersion on mechanical properties, a comparison of the changes in mechanical parameters of the rock before and after rock breaking and before and after drilling fluid immersion was established based on nanoindentation testing. This was done to determine the impact of rock breaking and drilling fluid immersion on the rock, thereby determining the changes in mechanical properties before and after rock breaking and before and after drilling fluid immersion during the drilling process.

[0075] Specifically, a method is provided to determine the changes in mechanical properties of rock before and after rock breaking and drilling fluid immersion. First, a full-diameter core sample is obtained, and a small sample is taken from the core for testing to obtain its mechanical properties. Then, an indoor drill bit rock breaking experiment is conducted, and the rock cuttings after rock breaking are tested to obtain their mechanical properties. Finally, the rock cuttings are immersed in drilling fluid, and their mechanical properties are tested. Through rapid experiments, the mechanical properties of the material can be obtained, allowing for the evaluation of changes in mechanical properties before and after rock breaking and drilling fluid immersion.

[0076] like Figure 2 As shown in the example, this method provides a way to determine the changes in mechanical properties of rock before and after rock breaking and drilling fluid immersion, including:

[0077] S1: Drilling to obtain full-diameter core samples;

[0078] S2: Obtain the mechanical properties of the rock core;

[0079] S3: Conduct rock breaking experiments on the core sample to simulate the rock breaking process during drilling;

[0080] S4: Obtain the mechanical properties after rock breaking;

[0081] S5: Soak the rock cuttings after rock breaking in the drilling fluid for a period of time;

[0082] S6: Obtain the mechanical properties of the rock cuttings after they have been soaked in drilling fluid;

[0083] S7: Based on the experimental results, determine the mechanical properties before and after rock breaking and before and after soaking in drilling fluid.

[0084] In the process of rock cuttings sampling, the samples used to obtain mechanical properties in three separate tests can be taken from the same full-diameter rock core. This ensures that the initial physical parameters and mechanical properties are basically consistent, and allows for a better determination of the changes in rock mechanical properties before and after rock breaking and before and after soaking in drilling fluid.

[0085] The drilling fluid mentioned above can be soaked using a self-priming soaking method. The soaking time can be selected between 24 hours and 96 hours to ensure that the cuttings are in different saturation stages, thereby more accurately characterizing the effect of drilling fluid soaking on the mechanical properties of the cuttings.

[0086] In practical applications, mineral composition analysis and microstructure scanning can be performed on rock cuttings. Whole-rock analysis and cast thin sections can be conducted on cores or rock cuttings to determine the total amount of clay minerals and the content of non-clay minerals in the core, clarifying the core's structure, intergranular filling type, and pore type. This allows for comparison of the compositional distribution and microstructure characteristics of full-diameter cores with fragments of different particle sizes, shapes, and colors. Compositional analysis and microstructure scanning of rock cuttings can reveal the mineral composition and fracture development characteristics of the core, enabling a better analysis of the reasons for the impact of rock breaking and drilling fluid on mechanical properties.

[0087] When simulating rock breaking and soaking drilling fluid on rock cuttings, the same drill bit used as the one used at the drilling site can be used to simulate the field conditions as realistically as possible and determine the impact of rock breaking on mechanical properties. The drilling fluid used for soaking can be taken from the drilling site to ensure the accuracy of the results.

[0088] In the example above, by conducting experiments on rock cuttings, the mechanical properties of the rock cuttings, such as elastic modulus and hardness, can be obtained. Based on the experimental results, the changes in mechanical properties before and after rock breaking and before and after soaking in drilling fluid can be determined.

[0089] The methods and embodiments provided in the above-described embodiments of this application can be executed in a mobile terminal, computer terminal, processor, server, or similar computing device. Taking its operation on an electronic device as an example... Figure 3 This is a hardware structure block diagram of an electronic device for a method of determining changes in rock mechanical properties provided in this application. (For example...) Figure 3 As shown, the electronic device 10 may include one or more (only one is shown in the figure) processors 02 (processors 02 may include, but are not limited to, microprocessors MCUs or programmable logic devices FPGAs, etc.), a memory 04 for storing data, and a transmission module 06 for communication functions. Those skilled in the art will understand that... Figure 3The structure shown is for illustrative purposes only and does not limit the structure of the electronic device described above. For example, electronic device 10 may also include... Figure 3 The more or fewer components shown, or having the same Figure 3 The different configurations shown.

[0090] The memory 04 can be used to store software programs and modules of application software, such as the program instructions / modules corresponding to the method for determining changes in rock mechanical properties in this embodiment. The processor 02 executes various functional applications and data processing by running the software programs and modules stored in the memory 04, thereby realizing the method for determining changes in rock mechanical properties of the aforementioned application. The memory 04 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 04 may further include memory remotely located relative to the processor 02, and these remote memories can be connected to the electronic device 10 via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0091] The transmission module 06 is used to receive or send data via a network. Specific examples of the network described above may include a wireless network provided by the communication provider of the electronic device 10. In one example, the transmission module 06 includes a Network Interface Controller (NIC), which can connect to other network devices via a base station to communicate with the Internet. In another example, the transmission module 06 may be a Radio Frequency (RF) module, used for wireless communication with the Internet.

[0092] At the software level, the aforementioned device for determining changes in rock mechanical properties can be as follows: Figure 4 As shown, it may include:

[0093] The first acquisition module 401 is used to acquire full-diameter core samples;

[0094] The second acquisition module 402 is used to acquire the mechanical properties of the full-diameter core as the first mechanical property;

[0095] Rock breaking module 403 is used to perform rock breaking operation on the full-diameter rock core to obtain rock fragments after rock breaking;

[0096] The third acquisition module 404 is used to acquire the mechanical properties of the rock fragments after rock breaking, as the second mechanical property;

[0097] The soaking module 405 is used to soak the rock cuttings after rock breaking with drilling fluid to obtain soaked rock cuttings;

[0098] The fourth acquisition module 406 is used to acquire the mechanical properties of the soaked rock fragments as the third mechanical property.

[0099] The first determining module 407 is used to determine the changes in mechanical properties before and after rock breaking based on the first mechanical property and the second mechanical property;

[0100] The second determining module 408 is used to determine the changes in mechanical properties of the rock before and after immersion in drilling fluid based on the second mechanical property and the third mechanical property.

[0101] In one embodiment, the third acquisition module 404 can specifically press a rigid indenter with a regular shape into the surface of the rock fragments after rock breaking under the action of gradually increasing external force; after the external force or displacement reaches a predetermined peak value, the external force is gradually removed; during the process of loading pressure and removing external force, the change curves of the indenter displacement and the load borne by the indenter are acquired; and the mechanical properties of the rock fragments after rock breaking are determined according to the change curves.

[0102] In one embodiment, the aforementioned second mechanical property may include, but is not limited to, at least one of the following: elastic modulus and hardness.

[0103] In one embodiment, after the aforementioned rock mechanical property determination device performs rock breaking operation on a full-diameter core to obtain rock fragments, it can also be used to perform compositional analysis on the rock fragments to obtain the mineral composition of the rock fragments; and to perform microstructure scanning on the rock fragments to obtain the fracture development characteristics of the rock fragments; wherein, the mineral composition and fracture development characteristics are used to combine the first mechanical property and the second mechanical property to determine the influence of the mineral composition and fracture development characteristics on the mechanical properties.

[0104] In one embodiment, the soaking module 405 can be used to obtain multiple preset durations; according to the multiple preset durations, the rock-breaking debris is soaked by a self-absorbing soaking method to obtain debris at different saturation stages.

[0105] In one implementation, the aforementioned durations can be selected between 24 hours and 96 hours.

[0106] In one embodiment, the first acquisition module 401 described above can be specifically used to obtain the full-diameter core by drilling at the drilling site using drilling equipment.

[0107] The embodiments of this application also provide a specific implementation of an electronic device capable of implementing all steps in the method for determining changes in rock mechanical properties as described in the above embodiments. The electronic device specifically includes: a processor, a memory, a communication interface, and a bus; wherein the processor, memory, and communication interface communicate with each other via the bus; the processor is used to call a computer program in the memory, and when the processor executes the computer program, it implements all steps in the method for determining changes in rock mechanical properties as described in the above embodiments. For example, when the processor executes the computer program, it implements the following steps:

[0108] Step 1: Obtain a full-diameter core;

[0109] Step 2: Obtain the mechanical properties of the full-diameter core sample, which will be used as the first mechanical property.

[0110] Step 3: Perform rock-breaking operation on the full-diameter core to obtain rock fragments;

[0111] Step 4: Obtain the mechanical properties of the rock fragments after rock breaking, as the second mechanical property;

[0112] Step 5: Soak the rock cuttings after rock breaking with drilling fluid to obtain soaked rock cuttings;

[0113] Step 6: Obtain the mechanical properties of the soaked rock fragments as the third mechanical property;

[0114] Step 7: Based on the first mechanical property and the second mechanical property, determine the changes in mechanical properties before and after rock breaking;

[0115] Step 8: Determine the changes in mechanical properties of the rock before and after soaking in drilling fluid, based on the second mechanical property and the third mechanical property.

[0116] As can be seen from the above description, the embodiments of this application obtain the mechanical properties of the full-diameter core, the mechanical properties of the rock cuttings after rock breaking, and the mechanical properties of the rock cuttings after soaking. This allows for the determination of the changes in mechanical properties before and after rock breaking and before and after soaking in drilling fluid. This solves the technical problem of low drilling efficiency caused by the failure to effectively consider the changes in mechanical properties before and after rock breaking and before and after soaking in drilling fluid, and achieves the technical effect of effectively improving drilling efficiency.

[0117] Embodiments of this application also provide a computer-readable storage medium capable of implementing all steps of the method for determining changes in rock mechanical properties in the above embodiments. The computer-readable storage medium stores a computer program that, when executed by a processor, implements all steps of the method for determining changes in rock mechanical properties in the above embodiments. For example, when the processor executes the computer program, it implements the following steps:

[0118] Step 1: Obtain a full-diameter core;

[0119] Step 2: Obtain the mechanical properties of the full-diameter core sample, which will be used as the first mechanical property.

[0120] Step 3: Perform rock-breaking operation on the full-diameter core to obtain rock fragments;

[0121] Step 4: Obtain the mechanical properties of the rock fragments after rock breaking, as the second mechanical property;

[0122] Step 5: Soak the rock cuttings after rock breaking with drilling fluid to obtain soaked rock cuttings;

[0123] Step 6: Obtain the mechanical properties of the soaked rock fragments as the third mechanical property;

[0124] Step 7: Based on the first mechanical property and the second mechanical property, determine the changes in mechanical properties before and after rock breaking;

[0125] Step 8: Determine the changes in mechanical properties of the rock before and after soaking in drilling fluid, based on the second mechanical property and the third mechanical property.

[0126] As can be seen from the above description, the embodiments of this application obtain the mechanical properties of the full-diameter core, the mechanical properties of the rock cuttings after rock breaking, and the mechanical properties of the rock cuttings after soaking. This allows for the determination of the changes in mechanical properties before and after rock breaking and before and after soaking in drilling fluid. This solves the technical problem of low drilling efficiency caused by the failure to effectively consider the changes in mechanical properties before and after rock breaking and before and after soaking in drilling fluid, and achieves the technical effect of effectively improving drilling efficiency.

[0127] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on its differences from other embodiments. In particular, hardware + program embodiments are relatively simple in description because they are fundamentally similar to method embodiments; relevant parts can be referred to the descriptions in the method embodiments.

[0128] The foregoing has described specific embodiments of this specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims may be performed in a different order than that shown in the embodiments and may still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require the specific or sequential order shown to achieve the desired result. In some embodiments, multitasking and parallel processing are possible or may be advantageous.

[0129] While this application provides the method operation steps as described in the embodiments or flowcharts, more or fewer operation steps may be included based on conventional or non-inventive labor. The order of steps listed in the embodiments is merely one possible execution order among many and does not represent the only execution order. In actual device or client product execution, the methods shown in the embodiments or drawings can be executed sequentially or in parallel (e.g., in a parallel processor or multi-threaded processing environment).

[0130] The systems, devices, modules, or units described in the above embodiments can be implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer. Specifically, a computer can be, for example, a personal computer, a laptop computer, an in-vehicle human-machine interaction device, a cellular phone, a camera phone, a smartphone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or any combination of these devices.

[0131] While this specification provides method operation steps as described in the embodiments or flowcharts, more or fewer operation steps may be included based on conventional or non-inventive means. The order of steps listed in the embodiments is merely one possible execution order among many and does not represent the only execution order. In actual device or end product execution, the methods shown in the embodiments or drawings may be executed sequentially or in parallel (e.g., in a parallel processor or multi-threaded processing environment, or even a distributed data processing environment). The terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, product, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, product, or apparatus. Without further limitations, the presence of other identical or equivalent elements in the process, method, product, or apparatus that includes said elements is not excluded.

[0132] For ease of description, the above devices are described in terms of function, divided into various modules. Of course, in implementing the embodiments of this specification, the functions of each module can be implemented in one or more software and / or hardware components, or a module that performs the same function can be implemented by a combination of multiple sub-modules or sub-units. The device embodiments described above are merely illustrative. For example, the division of units is only a logical functional division; in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, or indirect coupling or communication connection between devices or units, and may be electrical, mechanical, or other forms.

[0133] Those skilled in the art will also know that, besides implementing the controller using purely computer-readable program code, the same functions can be achieved by logically programming the method steps, making the controller function as logic gates, switches, application-specific integrated circuits (ASICs), programmable logic controllers (PLCs), and embedded microcontrollers. Therefore, such a controller can be considered a hardware component, and the devices within it used to implement various functions can also be considered structures within that hardware component. Alternatively, the devices used to implement various functions can be considered as both software modules implementing the method and structures within a hardware component.

[0134] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0135] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0136] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0137] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0138] Memory may include non-persistent storage in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0139] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0140] Those skilled in the art will understand that the embodiments of this specification can be provided as methods, systems, or computer program products. Therefore, the embodiments of this specification can take the form of entirely hardware embodiments, entirely software embodiments, or embodiments combining software and hardware aspects. Furthermore, the embodiments of this specification can take the form of computer program products 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 code.

[0141] The embodiments described in this specification can be described in the general context of computer-executable instructions, such as program modules, that are executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc., that perform a specific task or implement a specific abstract data type. The embodiments of this specification can also be practiced in distributed computing environments where tasks are performed by remote processing devices connected via a communication network. In distributed computing environments, program modules can reside in local and remote computer storage media, including storage devices.

[0142] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, system embodiments are basically similar to method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments. In the description of this specification, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments in this specification. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0143] The above description is merely an embodiment of the present specification and is not intended to limit the embodiments of the present specification. For those skilled in the art, various modifications and variations can be made to the embodiments of the present specification. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the embodiments of the present specification should be included within the scope of the claims of the embodiments of the present specification.

Claims

1. A method for determining changes in the mechanical properties of rocks, characterized in that, The method includes: Obtain full-diameter cores; Obtain the mechanical properties of the full-diameter core sample, and use them as the first mechanical property. The full-diameter core was subjected to rock breaking operation to obtain rock cuttings. When performing rock breaking operation on the full-diameter core, the same drill bit as the one used at the drilling site was used to simulate the site conditions as realistically as possible and to determine the impact of rock breaking on mechanical properties. The mechanical properties of the rock fragments after rock breaking are obtained as the second mechanical property; The rock cuttings after rock breaking are soaked in drilling fluid to obtain soaked rock cuttings; The mechanical properties of the soaked rock fragments were obtained as the third mechanical property. Based on the first mechanical property and the second mechanical property, determine the changes in mechanical properties before and after rock breaking; Based on the second mechanical property and the third mechanical property, determine the changes in mechanical properties of the rock before and after soaking with drilling fluid; This includes: mineral composition analysis and microstructure scanning of rock cuttings; whole-rock analysis and cast thin sections of cores or rock cuttings to determine the total amount of clay minerals and non-clay minerals in the core, clarify the core's structure, intergranular filling type, and pore type, thereby comparing the compositional distribution and microstructure characteristics of full-diameter cores with rock cuttings of different particle sizes, shapes, and colors; and performing compositional analysis and microstructure scanning of rock cuttings to obtain the mineral composition and fracture development characteristics of the core, thereby better analyzing the reasons for the influence of rock breaking and drilling fluid on mechanical properties.

2. The method according to claim 1, characterized in that, The mechanical properties of the rock fragments after rock breaking are obtained as a second mechanical property, including: A rigid indenter with a regular shape is pressed into the surface of the rock fragments after rock breaking under gradually increasing external force; After the external force or displacement reaches the predetermined peak value, the external force is gradually removed; During the process of applying pressure and removing external force, obtain the curves of the displacement of the indenter and the load borne by the indenter. Based on the change curve, the mechanical properties of the rock fragments after rock breaking are determined.

3. The method according to claim 2, characterized in that, The second mechanical property includes at least one of the following: elastic modulus and hardness.

4. The method according to claim 1, characterized in that, After performing rock-breaking operations on the full-diameter core to obtain rock fragments, the process further includes: The mineral composition of the rock fragments after rock breaking was obtained by performing compositional analysis. Microstructure scanning was performed on the rock fragments after rock breaking to obtain the fracture development characteristics of the rock fragments after rock breaking; The mineral composition and fracture development characteristics are used to determine the influence of mineral composition and fracture development characteristics on mechanical properties by combining the first mechanical property and the second mechanical property.

5. The method according to claim 1, characterized in that, The rock cuttings after rock breaking are soaked in drilling fluid to obtain soaked rock cuttings, including: Get multiple preset durations; According to the preset multiple time periods, the rock fragments after rock breaking are soaked in a self-absorbing soaking method to obtain rock fragments at different saturation stages.

6. The method according to claim 5, characterized in that, The durations are selected from 24 hours to 96 hours.

7. The method according to claim 1, characterized in that, Obtain full-diameter cores, including: The full-diameter core was obtained by drilling at the well site using drilling equipment.

8. A device for determining changes in the mechanical properties of rocks, characterized in that, include: The first acquisition module is used to acquire full-diameter core samples; The second acquisition module is used to acquire the mechanical properties of the full-diameter core as the first mechanical property; The rock-breaking module is used to break the rock of the full-diameter core to obtain rock cuttings. When breaking the rock of the full-diameter core, the same drill bit as the one used at the drilling site is used to simulate the site conditions as realistically as possible and to determine the impact of rock breaking on mechanical properties. The third acquisition module is used to acquire the mechanical properties of the rock fragments after rock breaking, as the second mechanical property; The soaking module is used to soak the rock cuttings after rock breaking with drilling fluid to obtain soaked rock cuttings; The fourth acquisition module is used to acquire the mechanical properties of the soaked rock fragments as the third mechanical property. The first determining module is used to determine the changes in mechanical properties before and after rock breaking based on the first mechanical property and the second mechanical property; The second determining module is used to determine the changes in mechanical properties of the rock before and after immersion in drilling fluid, based on the second mechanical property and the third mechanical property. The device for determining changes in rock mechanical properties is also used to perform mineral composition analysis and microstructure scanning on rock cuttings, and to perform whole-rock analysis and cast thin sections on cores or rock cuttings to determine the total amount of clay minerals and the content of non-clay minerals in the core, clarify the structure, intergranular filling type, and pore type of the core, thereby comparing the compositional distribution and microstructure characteristics of full-diameter cores with fragments of different particle sizes, shapes, and colors; and to perform compositional analysis and microstructure scanning on rock cuttings to obtain the mineral composition and fracture development characteristics of the core, thereby better analyzing the reasons for the influence of rock breaking and drilling fluid on mechanical properties.

9. An electronic device comprising a processor and a memory for storing processor-executable instructions, characterized in that, When the processor executes the instructions, it implements the steps of the method according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program / instructions stored thereon, characterized in that, When the computer program / instructions are executed by the processor, they implement the steps of the method according to any one of claims 1 to 7.

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