Method and device for determining the time of expanding the borehole while drilling based on the creep law of salt-gypsum layers

Abstract

The application provides a method and device for determining the operation time of expanding a borehole while drilling based on the creep law of a salt-gypsum layer, and relates to the technical field of oil and gas drilling. The method comprises the following steps: recording salt-gypsum layer creep data through a salt-gypsum layer creep test experiment; drawing a creep displacement versus creep time graph according to the salt-gypsum layer creep data; obtaining drilling log data, and determining the creep section depth, drilling fluid density and creep section deformation according to the drilling log data; determining the operation time of expanding a borehole while drilling according to the creep section depth, drilling fluid density, creep section deformation and creep displacement versus creep time graph. The application comprehensively uses laboratory experiments and field data analysis, improves the operation effect of expanding a borehole while drilling in a salt-gypsum layer, reduces the accident complexity of the salt-gypsum layer section, shortens the construction period of the salt-gypsum layer section, and saves the drilling cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil and gas drilling, and in particular to a method and device for determining the operation timing of while-drilling reaming based on the creep law of salt-gypsum layers. BACKGROUND

[0002] This section is intended to provide background or context to the embodiments of the application recited in the claims. The description herein does not constitute admission that the prior art is prior art nor does it constitute an admission of any description in the section as prior art unless expressly so stated.

[0003] Onshore deep layers are an important replacement field for energy, with 39% of remaining oil and 57% of remaining natural gas distributed in deep layers. Deep and ultra-deep oil and gas resources have become the main battlefield of future oil and gas strategies. Salt-gypsum layers are natural good cap rocks for oil and gas accumulation and contain a large amount of oil and gas resources in some areas. However, salt-gypsum layers have strong fluidity under high temperature and high pressure, which can easily cause hole necking and collapse, causing tripping resistance, sticking, casing deformation and other complex accidents, and even the risk of well abandonment, which poses a serious challenge to safe drilling, making salt-gypsum layer drilling a technical problem. Taking an exemplary region as an example, the complex deep well in this region has a depth of about 8000m, with a thick composite salt-gypsum layer developed, and accidents such as sticking, necking and sticking frequently occur during drilling. From 2018 to 2020, 67 wells had a total of 604 sticking accidents, resulting in 7 serious sticking accidents.

[0004] Currently, while-drilling reaming technology is commonly used to drill through salt-gypsum layers during salt-gypsum layer drilling to reduce the creep necking displacement of salt-gypsum layers and reduce or avoid complex situations such as sticking and necking. At the same time, it can increase the thickness of the cement sheath and improve the ability of the cement sheath system to resist formation creep, improve cementing quality and protect the oil layer casing, thereby offsetting the impact of salt-gypsum layer creep and achieving the purpose of "space" for "time". However, field while-drilling reaming operations are mostly based on experience, and when drilling time, torque and other abnormal phenomena occur, the while-drilling reaming tool is used, which is a passive operation mode. There is a lack of scientific guidance for the timing of while-drilling reaming operations, resulting in poor while-drilling reaming effect, low safety efficiency, and even multiple downhole complex accidents such as sticking, which seriously affects the safety drilling period.

[0005] In view of the above, there is an urgent need for a technical solution that can overcome the above-mentioned defects and effectively control the while-drilling reaming of salt-gypsum layers. SUMMARY

[0006] To address the problems existing in the prior art, this invention proposes a method and apparatus for determining the timing of reaming operations while drilling based on the creep law of salt-gypsum layers. This invention can rationally determine the timing of reaming operations while drilling when encountering salt-gypsum layers, initiate reaming operations while drilling in advance, achieve proactive operation, improve the effectiveness of reaming operations while drilling, reduce complex downhole accidents caused by passive operations, shorten the drilling cycle of salt-gypsum layers, and save drilling construction costs, which is of great significance for the development of deep and ultra-deep oil and gas resources.

[0007] In a first aspect of the present invention, a method for determining the timing of drilling reaming operations based on the creep law of salt-gypsum layers is proposed, comprising:

[0008] Creep data of the salt-gypsum layer were recorded through a creep test experiment.

[0009] Based on the creep data of the salt gypsum layer, plot a graph showing the relationship between creep displacement and creep time;

[0010] Obtain drilling log data, and determine the creep zone depth, drilling fluid density, and creep zone deformation based on the drilling log data;

[0011] Based on the drilling log data, determine the creep zone depth, drilling fluid density, creep zone deformation, and the relationship between creep displacement and creep time, and determine the timing of reaming operations while drilling.

[0012] In a second aspect of the present invention, a device for determining the timing of drilling reaming operations based on the creep law of salt-gypsum layers is proposed, comprising:

[0013] The creep testing module is used to record creep data of the salt-gypsum layer through creep testing experiments.

[0014] The relationship diagram drawing module is used to draw a relationship diagram between creep displacement and creep time based on the creep data of the salt paste layer;

[0015] The drilling log data processing module is used to acquire drilling log data and determine the creep zone depth, drilling fluid density, and creep zone deformation based on the drilling log data.

[0016] The drilling reaming operation timing judgment module is used to determine the creep section depth, drilling fluid density, creep section deformation, and creep displacement versus creep time relationship chart based on the drilling log data, and to determine the timing of the drilling reaming operation.

[0017] In a third aspect of the present invention, a computer device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements a method for determining the timing of drilling reaming operations based on the creep law of salt gypsum layers.

[0018] In a fourth aspect of the present invention, a computer-readable storage medium is provided, the computer-readable storage medium storing a computer program, which, when executed by a processor, implements a method for determining the timing of drilling reaming operations based on the creep law of salt gypsum layers.

[0019] In a fifth aspect of the present invention, a computer program product is provided, the computer program product comprising a computer program, which, when executed by a processor, implements a method for determining the timing of drilling reaming operations based on the creep law of salt gypsum layers.

[0020] The method and apparatus proposed in this invention for determining the timing of reaming operations while drilling based on the creep law of salt-gypsum layers obtain the creep law of salt-gypsum layers through creep testing experiments, establish a graph showing the relationship between creep displacement and creep time in salt-gypsum layers, and analyze the shrinkage deformation based on data such as resistance and stuck pipe in the creep section to determine the creep time of the salt-gypsum layer. This allows for reasonable guidance on the timing of reaming operations while drilling in adjacent wells in salt-gypsum layers, improving the effectiveness of reaming operations while drilling in salt-gypsum layers, preventing downhole stuck pipe accidents, shortening the drilling cycle, and saving drilling construction costs. This is of great significance for the development of deep and ultra-deep oil and gas resources. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic flowchart of a method for determining the timing of drilling reaming operations based on the creep law of salt gypsum layers, according to an embodiment of the present invention.

[0023] Figure 2 This is a schematic diagram of the process of a salt paste layer creep test experiment according to a specific embodiment of the present invention.

[0024] Figure 3 This is a schematic diagram of the process for analyzing drilling log data according to a specific embodiment of the present invention.

[0025] Figure 4 This is a flowchart illustrating the process of determining the timing of drilling reaming operations according to a specific embodiment of the present invention.

[0026] Figure 5 This is a schematic diagram of the relationship between creep displacement and creep time in a salt paste layer according to a specific embodiment of the present invention.

[0027] Figure 6 This is a schematic diagram of the deformation between the drill string assembly and the wellbore size during creep drilling according to a specific embodiment of the present invention.

[0028] Figure 7 This is a schematic diagram of the location of the deformation amount of the marked creep segment according to a specific embodiment of the present invention.

[0029] Figure 8 This is a schematic diagram of the device architecture for determining the timing of drilling reaming operations based on the creep law of salt gypsum layers, according to an embodiment of the present invention.

[0030] Figure 9 This is a schematic diagram of a computer device structure according to an embodiment of the present invention. Detailed Implementation

[0031] The principles and spirit of the invention will now be described with reference to several exemplary embodiments. It should be understood that these embodiments are given merely to enable those skilled in the art to better understand and implement the invention, and are not intended to limit the scope of the invention in any way. Rather, these embodiments are provided to make this disclosure more thorough and complete, and to fully convey the scope of this disclosure to those skilled in the art.

[0032] Those skilled in the art will recognize that embodiments of the present invention can be implemented as a system, apparatus, device, method, or computer program product. Therefore, this disclosure can be specifically implemented in the following forms: entirely hardware, entirely software (including firmware, resident software, microcode, etc.), or a combination of hardware and software.

[0033] According to embodiments of the present invention, a method and apparatus for determining the timing of reaming operations while drilling based on the creep law of salt-gypsum layers are proposed, relating to the field of oil and gas drilling technology. This invention employs a combination of qualitative and quantitative methods, comprehensively utilizing indoor experiments and field data analysis to rationally determine the timing of reaming operations while drilling in salt-gypsum layers, thereby improving the effectiveness of reaming operations, reducing the complexity of accidents in salt-gypsum layer sections, shortening the construction cycle in salt-gypsum layer sections, and saving drilling costs.

[0034] The principles and spirit of the present invention will be explained in detail below with reference to several representative embodiments.

[0035] Figure 1 This is a schematic flowchart of a method for determining the timing of drilling reaming operations based on the creep law of salt-gypsum layers, according to an embodiment of the present invention. Figure 1 As shown, the method includes:

[0036] S1, Record the creep data of the salt-gypsum layer through the salt-gypsum layer creep test experiment;

[0037] S2, Based on the creep data of the salt paste layer, plot a graph showing the relationship between creep displacement and creep time;

[0038] S3, Obtain drilling log data, and determine the creep section depth, drilling fluid density, and creep section deformation based on the drilling log data;

[0039] S4. Based on the drilling log data, determine the creep section depth, drilling fluid density, creep section deformation, and the relationship chart between creep displacement and creep time, and determine the timing of drilling reaming operations.

[0040] This invention obtains the creep law of salt-gypsum layers through creep testing experiments, establishes a graph showing the relationship between creep displacement and creep time in salt-gypsum layers, and analyzes the shrinkage deformation based on data such as resistance and stuck pipe in the creep stage to determine the creep time of the salt-gypsum layer. This allows for reasonable guidance on the timing of reaming operations in adjacent wells during drilling in salt-gypsum layers, improving the effectiveness of reaming operations, preventing downhole stuck pipe accidents, shortening the drilling cycle, and saving drilling construction costs. This is of great significance for the development of deep and ultra-deep oil and gas resources.

[0041] To provide a clearer explanation of the method for determining the timing of drilling reaming operations based on the creep law of salt-gypsum layers, each step will be explained in detail below.

[0042] In S1, the creep data of the salt-gypsum layer is recorded through a creep test experiment.

[0043] refer to Figure 2 The specific process is as follows:

[0044] S101, Place the salt-gypsum layer rock sample on a true triaxial experimental instrument;

[0045] S102, the axial pressure and confining pressure were applied in stages using a true triaxial experimental instrument, and the salt-gypsum rock sample was heated using a multi-stage heating method;

[0046] S103. After the salt-gypsum layer rock sample is destroyed, stop the experiment and record the creep data of the salt-gypsum layer.

[0047] In practical applications, a complete standard rock sample is placed on a true triaxial experimental apparatus, and the equipment and pipelines are assembled. A servo control system is used to apply axial pressure and confining pressure in stages, and a multi-stage heating method is employed to control the internal temperature. After the rock sample is destroyed, the experimental apparatus is shut down, cooled to room temperature, and then the servo system is turned off, and the axial pressure and confining pressure are unloaded, ending the experiment.

[0048] In S2, based on the creep data of the salt paste layer, a graph depicting the relationship between creep displacement and creep time is plotted, including:

[0049] Based on the depth of the salt-gypsum layer, creep data of salt-gypsum layers at different depths were statistically analyzed. Based on the creep data of salt-gypsum layers at different depths, graphs showing the relationship between creep displacement and creep time for rock samples of salt-gypsum layers at different depths were plotted.

[0050] In S3, drilling log data is acquired, and the creep zone depth, drilling fluid density, and creep zone deformation are determined based on the drilling log data.

[0051] refer to Figure 3 The specific process is as follows:

[0052] S301, Analyze accidents occurring in the salt-gypsum formation based on drilling log data; wherein, the accidents are one or more combinations including obstruction and stuck pipe;

[0053] S302. Based on the drilling log data of the accident, determine the depth range of the creep zone and the drilling fluid density.

[0054] S303, determine the amount of creep deformation based on the drill string assembly and wellbore size of the section where the accident occurred.

[0055] Specifically, the drilling log data is analyzed to determine whether complex incidents such as obstruction or stuck pipe have occurred in the salt-gypsum layer. The depth range and drilling fluid density of the creep zone are determined based on data regarding obstruction and stuck pipe in the salt-gypsum layer. The amount of deformation in the creep zone is determined based on the drill string assembly and wellbore dimensions for the salt-gypsum layer obstruction and stuck pipe incidents.

[0056] In S4, based on the drilling log data, the creep section depth, drilling fluid density, creep section deformation, and the relationship chart between creep displacement and creep time are determined to determine the timing of drilling reaming operations.

[0057] refer to Figure 4 The specific process is as follows:

[0058] S401, Based on the creep segment depth, find the graph showing the relationship between creep displacement and creep time for the salt-gypsum rock sample corresponding to the creep segment depth;

[0059] S402, mark the creep segment deformation amount in the relational diagram to obtain the creep time corresponding to the creep segment deformation amount;

[0060] S403, based on the drilling fluid density and creep time, determine the interval time for drilling reaming operations, and perform drilling reaming operations according to the interval time.

[0061] Specifically, on the vertical axis of the graph showing the relationship between creep displacement and creep time in the salt-gypsum layer, the corresponding relationship curve is selected based on the depth of the creep segment where complex accidents such as obstruction or stuck drill occur.

[0062] Mark the location of the deformation in the creep segment on the vertical axis of the graph showing the relationship between creep displacement and creep time in the salt-gypsum layer. On the vertical axis of the graph showing the relationship between creep displacement and creep time in the salt-gypsum layer, find the creep time corresponding to the horizontal axis based on the selected curve and the location of the marked point.

[0063] After encountering a salt-gypsum layer at the creep stage depth, if the actual drilling fluid density is greater than that of the adjacent well's creep stage drilling fluid, active reaming should be initiated every creep time interval to meet engineering requirements. If the actual drilling fluid density is less than or equal to that of the adjacent well's creep stage drilling fluid, active reaming should be initiated every 3 / 4 of a creep time interval to meet engineering requirements.

[0064] It should be noted that although the operation of the method of the present invention has been described in a specific order in the above embodiments and figures, this does not require or imply that the operations must be performed in that specific order, or that all the operations shown must be performed to achieve the desired result. Additionally or alternatively, certain steps may be omitted, multiple steps may be combined into one step, and / or one step may be broken down into multiple steps.

[0065] To provide a clearer explanation of the method for determining the timing of drilling reaming operations based on the creep law of salt-gypsum layers, a specific embodiment will be used for illustration below.

[0066] S1, Record the creep data of the salt-gypsum layer through the creep test experiment:

[0067] First, place the cut standard rock sample onto the true triaxial experimental apparatus and assemble the equipment and pipelines.

[0068] During assembly, the rock sample is wrapped in a thermoplastic tube, the sensor is placed on the outside of the thermoplastic tube, and after adjusting the position of the sensor probe, it is placed in the center of the base. The standard rock sample size is 50mm×100mm.

[0069] The axial pressure and confining pressure are applied in stages by the servo control system on the true triaxial experimental instrument. By keeping the principal stress σ1 = 125MPa constant, starting from the initial stress σ3 = 120MPa and the deviatoric stress σ1-σ3 = 5MPa, the confining pressure (σ3) is reduced by 5MPa at each stage while the axial deviatoric stress (σ1-σ3) is increased by 5MPa at each stage, so as to keep the principal stress constant and gradually increase the deviatoric stress by 5MPa.

[0070] The internal temperature is controlled by an automated multi-stage heating method on the true triaxial experimental instrument, starting from 100℃, with five temperature levels designed: 110℃, 120℃, 130℃, and 140℃.

[0071] After the rock sample was destroyed, the experimental instrument was stopped, the creep data of the salt-gypsum layer was recorded, and the servo system was turned off after the rock sample cooled to room temperature. The axial pressure and confining pressure were then unloaded, and the experiment ended.

[0072] S2, Based on the creep data of the salt paste layer, plot a graph showing the relationship between creep displacement and creep time:

[0073] Statistical analysis was conducted on the creep displacement and creep time of all rock samples, and point-line plots of creep displacement and creep time were created for salt-gypsum layer rock samples at different depths. (Reference) Figure 5 This is a schematic diagram of the relationship between creep displacement and creep time in a salt paste layer according to a specific embodiment of the present invention. Figure 5 In the figure, the horizontal axis represents time, and the vertical axis represents creep displacement. The marks H0 to H4 in the figure represent different depth segments.

[0074] S3, Obtain drilling log data, and determine the creep section depth, drilling fluid density, and creep section deformation based on the drilling log data:

[0075] Based on the analysis of drilling log data, determine whether complex accidents such as obstruction or stuck pipe have occurred in the salt-gypsum formation.

[0076] The creep zone depth range and drilling fluid density are determined based on data such as encountering resistance in the salt-gypsum layer and stuck pipe in the drilling log.

[0077] The amount of deformation in the creep stage is determined based on the drill string combination and wellbore size for sections where the drill encounters resistance or gets stuck in the salt-gypsum layer.

[0078] refer to Figure 6 This is a schematic diagram illustrating the deformation between the drill string assembly and the wellbore size during creep drilling according to a specific embodiment of the present invention. Figure 6 As shown, the deformation of the creep section can be determined based on the deformation between the drill string assembly and the wellbore size.

[0079] S4. Based on the drilling log data, determine the creep section depth, drilling fluid density, creep section deformation, and the relationship between creep displacement and creep time, and determine the timing of reaming operations while drilling:

[0080] On the vertical axis of the graph showing the relationship between creep displacement and creep time in the salt-gypsum layer, select the corresponding relationship curve based on the depth of the creep segment where complex accidents such as obstruction or stuck drill occur.

[0081] Mark the location of the creep segment deformation on the vertical axis of the graph showing the relationship between creep displacement and creep time in the salt-gypsum layer. Based on the selected curve and the location of the marked points, find the creep time corresponding to the horizontal axis.

[0082] refer to Figure 7 This is a schematic diagram illustrating the location of the deformation amount of the marked creep segment according to a specific embodiment of the present invention. Figure 7 As shown in the figure, based on the relationship between creep displacement and creep time of the salt gypsum layer, determine the creep time t0 corresponding to the 20mm creep deformation at depth H0.

[0083] After encountering the salt-gypsum layer, if the actual drilling fluid density is greater than the drilling fluid density of the creep section of the adjacent well, active reaming will be initiated every creep time (t0) to meet the engineering requirements.

[0084] If the actual drilling fluid density is less than or equal to the drilling fluid density in the creep section of the adjacent well, active reaming will be initiated every 3 / 4 creep time (0.75t0) to meet the engineering requirements.

[0085] After introducing the method of exemplary embodiments of the present invention, the following references are made. Figure 8 This invention introduces an exemplary embodiment of a device for determining the timing of drilling reaming operations based on the creep law of salt gypsum layers.

[0086] The implementation of the device for determining the timing of drilling reaming operations based on the creep law of salt gypsum layers can refer to the implementation of the above-described method, and the repetitions will not be repeated. The term "module" or "unit" used below can refer to a combination of software and / or hardware that implements a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0087] Based on the same inventive concept, this invention also proposes a device for determining the timing of drilling reaming operations based on the creep law of salt-gypsum layers, such as... Figure 8 As shown, the device includes:

[0088] The creep test module 810 is used to record the creep data of the salt-gypsum layer through the creep test experiment;

[0089] The relationship diagram drawing module 820 is used to draw a relationship diagram between creep displacement and creep time based on the creep data of the salt paste layer;

[0090] The drilling log data processing module 830 is used to acquire drilling log data and determine the creep section depth, drilling fluid density, and creep section deformation based on the drilling log data.

[0091] The drilling reaming operation timing judgment module 840 is used to determine the creep section depth, drilling fluid density, creep section deformation, and creep displacement versus creep time relationship chart based on the drilling log data, and to determine the timing of the drilling reaming operation.

[0092] In one embodiment, the creep testing module 810 is specifically used for:

[0093] Place the salt-gypsum layer rock sample on a true triaxial experimental apparatus;

[0094] The axial pressure and confining pressure were applied in stages using a true triaxial experimental instrument, and the salt-gypsum rock sample was heated using a multi-stage heating method.

[0095] After the salt-gypsum layer rock sample is destroyed, the experiment is stopped and the creep data of the salt-gypsum layer is recorded.

[0096] In one embodiment, the relationship diagram drawing module 820 is specifically used for:

[0097] Based on the depth of the salt-gypsum layer, creep data of salt-gypsum layers at different depths were statistically analyzed. Based on the creep data of salt-gypsum layers at different depths, graphs showing the relationship between creep displacement and creep time for rock samples of salt-gypsum layers at different depths were plotted.

[0098] In one embodiment, the drilling log data processing module 830 is specifically used for:

[0099] Analysis of accidents occurring in the salt-gypsum formation based on drilling log data; wherein, the accidents are one or more combinations including obstruction and stuck pipe;

[0100] Based on the drilling log data from the accident, determine the depth range of the creep zone and the drilling fluid density;

[0101] The amount of deformation in the creep section is determined based on the drill string assembly and wellbore size of the section where the accident occurred.

[0102] In one embodiment, the timing determination module 840 for drilling reaming operations is specifically used for:

[0103] Based on the creep segment depth, find the graph showing the relationship between creep displacement and creep time for the salt-gypsum layer rock sample corresponding to the creep segment depth;

[0104] Mark the deformation amount of the creep segment in the relational diagram to obtain the creep time corresponding to the deformation amount of the creep segment;

[0105] Based on the drilling fluid density and creep time, the interval for drilling reaming operations is determined, and drilling reaming operations are performed according to the interval.

[0106] Specifically, the 840 module for determining the timing of drilling reaming operations is used for:

[0107] After encountering a salt-gypsum layer at the creep depth, if the actual drilling fluid density is greater than that of the adjacent well's creep zone, active reaming should be initiated every creep time interval to meet engineering requirements; if the actual drilling fluid density is less than or equal to that of the adjacent well's creep zone, active reaming should be initiated every 3 / 4 creep time interval to meet engineering requirements.

[0108] It should be noted that although several modules of the device for determining the timing of drilling reaming operations based on the creep law of salt gypsum layers are mentioned in the detailed description above, this division is merely exemplary and not mandatory. In fact, according to embodiments of the present invention, the features and functions of two or more modules described above can be embodied in one module. Conversely, the features and functions of one module described above can be further divided and embodied by multiple modules.

[0109] Based on the aforementioned inventive concept, such as Figure 9 As shown, the present invention also proposes a computer device 900, including a memory 910, a processor 920, and a computer program 930 stored in the memory 910 and executable on the processor 920. When the processor 920 executes the computer program 930, it implements the aforementioned method for determining the timing of drilling reaming operations based on the creep law of salt gypsum layers.

[0110] Based on the aforementioned inventive concept, the present invention proposes a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the aforementioned method for determining the timing of drilling reaming operations based on the creep law of salt gypsum layers.

[0111] Based on the aforementioned inventive concept, the present invention proposes a computer program product, which includes a computer program that, when executed by a processor, implements a method for determining the timing of drilling reaming operations based on the creep law of salt gypsum layers.

[0112] The method and apparatus proposed in this invention for determining the timing of reaming operations while drilling based on the creep law of salt-gypsum layers obtain the creep law of salt-gypsum layers through creep testing experiments, establish a graph showing the relationship between creep displacement and creep time in salt-gypsum layers, and analyze the shrinkage deformation based on data such as resistance and stuck pipe in the creep section to determine the creep time of the salt-gypsum layer. This allows for reasonable guidance on the timing of reaming operations while drilling in adjacent wells in salt-gypsum layers, improving the effectiveness of reaming operations while drilling in salt-gypsum layers, preventing downhole stuck pipe accidents, shortening the drilling cycle, and saving drilling construction costs. This is of great significance for the development of deep and ultra-deep oil and gas resources.

[0113] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, apparatus, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied 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.

[0114] This invention is described with reference to flowchart illustrations and / or block diagrams of methods and computer program products according to embodiments of the invention. 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 illustrations and / or block diagrams.Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0115] 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.

[0116] 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.

[0117] Finally, it should be noted that the above-described embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and not to limit it. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed in the present invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for determining the timing of drilling reaming operations based on the creep law of salt-gypsum layers, characterized in that, include: Creep data of the salt-gypsum layer were recorded through a creep test experiment. Based on the creep data of the salt gypsum layer, plot a graph showing the relationship between creep displacement and creep time; Obtain drilling log data, and determine the creep zone depth, drilling fluid density, and creep zone deformation based on the drilling log data; Based on the drilling log data, determine the creep zone depth, drilling fluid density, creep zone deformation, and the relationship chart between creep displacement and creep time, and determine the timing of drilling reaming operations. Among them, the creep data of the salt-gypsum layer were recorded through a creep test experiment, including: Place the salt-gypsum layer rock sample on a true triaxial experimental apparatus; The axial pressure and confining pressure were applied in stages using a true triaxial experimental instrument, and the salt-gypsum rock sample was heated using a multi-stage heating method. After the rock sample of the salt-gypsum layer is destroyed, the experiment is stopped and the creep data of the salt-gypsum layer is recorded. Among them, based on the creep data of the salt gypsum layer, a graph showing the relationship between creep displacement and creep time is plotted, including: Based on the depth of the salt-gypsum layer, creep data of salt-gypsum layers at different depths were collected. Based on the creep data of salt-gypsum layers at different depths, graphs showing the relationship between creep displacement and creep time for rock samples of salt-gypsum layers at different depths were plotted. This includes acquiring drilling log data and determining the creep stage depth, drilling fluid density, and creep stage deformation based on the drilling log data, including: Analysis of accidents occurring in the salt-gypsum formation based on drilling log data; wherein, the accidents are one or more combinations including obstruction and stuck pipe; Based on the drilling log data from the accident, determine the depth range of the creep zone and the drilling fluid density; The amount of deformation in the creep section is determined based on the drill string assembly and wellbore size of the section where the accident occurred. Specifically, based on the drilling log data, the depth of the creep zone, drilling fluid density, creep zone deformation, and the relationship chart between creep displacement and creep time are determined to identify the timing of reaming operations while drilling, including: Based on the creep segment depth, find the graph showing the relationship between creep displacement and creep time for the salt-gypsum layer rock sample corresponding to the creep segment depth; Mark the deformation amount of the creep segment in the relational diagram to obtain the creep time corresponding to the deformation amount of the creep segment; Based on the drilling fluid density and creep time, the interval for drilling reaming operations is determined, and drilling reaming operations are performed according to the interval.

2. The method according to claim 1, characterized in that, Based on the drilling fluid density and creep time, determine the interval for reaming operations while drilling, and perform reaming operations while drilling according to the stated interval, including: After encountering a salt-gypsum layer at the creep depth, if the actual drilling fluid density is greater than that of the adjacent well's creep zone, active reaming should be initiated every creep time interval to meet engineering requirements; if the actual drilling fluid density is less than or equal to that of the adjacent well's creep zone, active reaming should be initiated every 3 / 4 creep time interval to meet engineering requirements.

3. A device for determining the timing of reaming operations while drilling based on the creep law of salt-gypsum layers, characterized in that, include: The creep testing module is used to record creep data of the salt-gypsum layer through creep testing experiments. The relationship diagram drawing module is used to draw a relationship diagram between creep displacement and creep time based on the creep data of the salt paste layer; The drilling log data processing module is used to acquire drilling log data and determine the creep zone depth, drilling fluid density, and creep zone deformation based on the drilling log data. The drilling reaming operation timing judgment module is used to determine the creep zone depth, drilling fluid density, creep zone deformation, and creep displacement versus creep time relationship chart based on the drilling log data, and to determine the timing of the drilling reaming operation. Specifically, the creep test module is used for: Place the salt-gypsum layer rock sample on a true triaxial experimental apparatus; The axial pressure and confining pressure were applied in stages using a true triaxial experimental instrument, and the salt-gypsum rock sample was heated using a multi-stage heating method. After the rock sample of the salt-gypsum layer is destroyed, the experiment is stopped and the creep data of the salt-gypsum layer is recorded. Specifically, the relationship diagram drawing module is used for: Based on the depth of the salt-gypsum layer, creep data of salt-gypsum layers at different depths were collected. Based on the creep data of salt-gypsum layers at different depths, graphs showing the relationship between creep displacement and creep time for rock samples of salt-gypsum layers at different depths were plotted. The drilling log data processing module is specifically used for: Analysis of accidents occurring in the salt-gypsum formation based on drilling log data; wherein, the accidents are one or more combinations including obstruction and stuck pipe; Based on the drilling log data from the accident, determine the depth range of the creep zone and the drilling fluid density; The amount of deformation in the creep section is determined based on the drill string assembly and wellbore size of the section where the accident occurred. The module for determining the timing of drilling reaming operations is specifically used for: Based on the creep segment depth, find the graph showing the relationship between creep displacement and creep time for the salt-gypsum layer rock sample corresponding to the creep segment depth; Mark the deformation amount of the creep segment in the relational diagram to obtain the creep time corresponding to the deformation amount of the creep segment; Based on the drilling fluid density and creep time, the interval for drilling reaming operations is determined, and drilling reaming operations are performed according to the interval.

4. The apparatus according to claim 3, characterized in that, The timing determination module for drilling reaming operations is specifically used for: After encountering a salt-gypsum layer at the creep depth, if the actual drilling fluid density is greater than that of the adjacent well's creep zone, active reaming should be initiated every creep time interval to meet engineering requirements; if the actual drilling fluid density is less than or equal to that of the adjacent well's creep zone, active reaming should be initiated every 3 / 4 creep time interval to meet engineering requirements.

5. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the method of claim 1 or 2.

6. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the method of claim 1 or 2.

7. A computer program product, characterized in that, The computer program product includes a computer program that, when executed by a processor, implements the method of claim 1 or 2.

Images