A logging-while-drilling instrument testing device

Abstract

The present invention provides a logging while drilling instrument testing device, comprising a formation simulation module including a plurality of first tube sections and a second tube section arranged on the periphery of the first tube section, wherein the first end faces of the two first tube sections in the vertical direction abut against each other, and the second end faces in the horizontal direction abut against the second end faces of the other two first tube sections, the inner surface of each second tube section abuts against the outer surface of each first tube section, the inner surfaces of the plurality of first tube sections form a first accommodation space, and a wellbore simulation module is arranged in the first accommodation space. The present invention can simulate radially layered formations and axially segmented formations, improve the accuracy of experimental data measured by the logging while drilling instrument testing device, provide a real environment for calibration testing of the logging while drilling instrument, have low testing cost and high measurement accuracy, and is of great significance for testing the logging while drilling instrument in the initial development stage.

Description

Technical Field

[0001] This invention relates to the field of deep formation oil and gas energy storage technology, specifically to a logging-while-drilling instrument testing device. Background Technology

[0002] With the increasing level of oilfield exploration and development, logging-while-drilling resistivity and logging-while-drilling acoustic instruments are being used more and more widely in formation evaluation and geological steering. In order to test the measurement accuracy and operational reliability of the instruments, calibration tests need to be performed on the ground.

[0003] Existing instrument calibration tests are typically performed in calibration wells or in water tanks. While calibration well testing offers high accuracy, the construction cost of calibration wells is relatively high, and testing is very difficult for partially sealed or non-integrated instruments without battery sub-sections. Water tank testing cannot reveal formation orientation and depth characteristics, only providing functional verification of the instrument, and the testing granularity is too coarse. Both methods have significant drawbacks. Therefore, there is a need to develop a dedicated logging-while-drilling (LOD) instrument testing device to perform calibration tests on the surface.

[0004] Existing logging-while-drilling (LOD) instrument testing devices, such as the Chinese invention patent with publication number CN103198748B, involve an experimental device for an electrical logging method. This device includes: a water tank, simulated formation modules, a transmission mechanism, loop electrodes, an electrode assembly, and measurement and control instruments. The entire bottom of the water tank is equipped with loop electrodes, and multiple simulated formation modules are located within the water tank. Each simulated formation module has a simulated wellbore at its axis. The interior of the module is filled with a high-resistivity liquid, and a first gold-plated metal probe is arranged on the sidewall of the simulated wellbore. The transmission mechanism includes a stepper motor, a transmission wheel, a slider, a traction wire, and a guide rail. The electrode assembly includes a frame and an electrode system. When the slider moves on the guide rail, it drives the frame and electrode system to move synchronously within the simulated wellbore. While this experimental device can simulate the characteristics and patterns of equipotential, gradient, and lateral logging responses in formations with different resistivity, high-resistivity formations of different thicknesses, and high-resistivity formation shielding, it cannot simulate radially layered and axially segmented formations.

[0005] For example, the publicly available document "Development and Application of Simulation Experimental Device for Sonic Logging While Drilling" describes a simulation experimental device for an acoustic logging while drilling tool, including a wellbore, flange, plug, water inlet pipe, internal pulley, and wellbore support, which can simulate formations of different hardness around the instrument when it is working downhole. However, it also cannot simulate radially layered and axially segmented formations.

[0006] In summary, existing logging-while-drilling (LWD) instrument testing devices cannot simulate radially layered and axially segmented formations, resulting in inaccurate formation simulation and an inability to accurately simulate real formations, thus reducing the accuracy of experimental data obtained by the LWD instrument testing devices. Summary of the Invention

[0007] One objective of this invention is to provide a logging-while-drilling instrument testing device that can simulate radially layered formations and axially segmented formations, thereby improving the accuracy of formation simulation and thus improving the accuracy of experimental data measured by the logging-while-drilling instrument testing device.

[0008] According to the present invention, a logging-while-drilling instrument testing device includes a formation simulation module and a wellbore simulation module. The formation simulation module includes a plurality of first pipe sections and second pipe sections disposed on the outer periphery of the first pipe sections. The first end faces of two first pipe sections abut against each other in the vertical direction, and the second end faces of two other first pipe sections abut against each other in the horizontal direction, so that the plurality of first pipe sections achieve formation segmentation in the horizontal direction. The inner surface of each second pipe section abuts against the outer surface of each first pipe section, so that the plurality of first pipe sections and the plurality of second pipe sections respectively achieve formation stratification in the vertical direction and the plurality of second pipe sections simultaneously achieve formation segmentation in the horizontal direction, so as to simulate radially layered formations and axially segmented formations. The inner surfaces of the plurality of first pipe sections form a first accommodating space, and the wellbore simulation module is disposed in the first accommodating space.

[0009] In a preferred embodiment, the first end faces of two second tubes abut against each other in the vertical direction, and the second end faces in the horizontal direction abut against the second end faces of the other two second tubes, with the inner surface of each second tube forming a second receiving space.

[0010] In a preferred embodiment, both the first tube and the second tube are configured as fan-shaped bodies, and the second tube has the same center as the first tube, with the radius of the second tube being larger than that of the first tube.

[0011] In a preferred embodiment, both the second end face of the first tube and the second end face of the second tube are provided with injection holes in the horizontal direction, and the injection holes are filled with fluids for simulating different resistivities or sound velocities.

[0012] In a preferred embodiment, both the first tube and the second tube are provided with wires on their second end faces in the horizontal direction, and a plurality of the first tubes are connected by wires, and a plurality of the second tubes are connected by wires.

[0013] In a preferred embodiment, the wellbore simulation module includes a water tank for placing logging-while-drilling instruments, the outer surface of the water tank being in contact with the inner surface of each of the first pipe sections, and the interior of the water tank having a receiving space filled with water.

[0014] In a preferred embodiment, the water tank is configured as a cylinder.

[0015] In a preferred embodiment, the water tank includes two tank housings that are sealed together to form a closed space.

[0016] In a preferred embodiment, the water tank has a water injection hole on its horizontal end face, and the water injection hole communicates with a sealed space formed inside the water tank shell.

[0017] In a preferred embodiment, a conductive wire is provided on the horizontal end face of the water tank, the conductive wire passing through the interior and exterior of the water tank, and is used to connect the signal debugging line of the logging-while-drilling instrument.

[0018] In a preferred embodiment, the two tank housings are provided with sealing rings at their respective edges, so that the two tank housings can be sealed at the joint, thereby forming a closed space inside the tank housings.

[0019] In a preferred embodiment, the two tank housings are fixed together by an annular locking buckle to form the tank.

[0020] The logging-while-drilling (LWD) instrument testing device of the present invention includes a formation simulation module and a wellbore simulation module. The formation simulation module includes multiple first pipe sections and second pipe sections disposed on the outer periphery of the first pipe sections. The first end faces of two first pipe sections abut each other in the vertical direction, and the second end faces of two other first pipe sections abut each other in the horizontal direction. The inner surface of each second pipe section abuts the outer surface of each first pipe section. The inner surfaces of the multiple first pipe sections form a first accommodating space, and the wellbore simulation module is disposed in the first accommodating space. This allows the multiple first pipe sections and the multiple second pipe sections to achieve formation segmentation in the horizontal direction, and the multiple first pipe sections and the multiple second pipe sections to achieve formation stratification in the vertical direction. This enables the simulation of radially segmented formations and axially segmented formations, improving the accuracy of formation simulation and thus improving the accuracy of experimental data measured by the LWD instrument testing device. It provides a realistic environment for calibration testing of LWD instruments, with low testing cost and high measurement accuracy, which is of great significance for testing in the early development stage of LWD instruments.

[0021] This invention utilizes a method where the first end faces of two second pipe sections abut against each other in the vertical direction, and the second end faces of two other second pipe sections abut against each other in the horizontal direction. The inner surfaces of each second pipe section form a second accommodating space. This allows multiple second pipe sections to achieve formation segmentation in the horizontal direction, and multiple first pipe sections and multiple second pipe sections to achieve formation stratification in the vertical direction. This enables the simulation of radially segmented formations and axially segmented formations, improving the accuracy of formation simulation. Consequently, it improves the accuracy of experimental data measured by logging-while-drilling (LWD) instrument testing devices. It provides a realistic environment for calibration testing of LWD instruments, with low testing costs and high measurement accuracy, making it of great significance for testing in the early development stage of LWD instruments.

[0022] The present invention has the following advantages: both the first and second pipe sections are constructed as fan-shaped bodies, the second pipe section and the first pipe section have the same center, and the radius of the second pipe section is larger than that of the first pipe section. On the one hand, the installation process of the logging-while-drilling instrument testing device can be simplified by the paired first and second pipe sections being nested together. On the other hand, it can make the first and second pipe sections fit tightly together and maintain the stability of the fit.

[0023] The present invention has injection holes opened horizontally on the second end faces of the first and second pipe sections, and the injection holes are filled with fluids for simulating different resistivities or sound velocities. It is possible to configure fluids with different properties in the injection holes of each first and second pipe section. The electrical or acoustic properties of the fluids can be changed by chemical reagents or physical configuration, thereby simulating geological data of different strata.

[0024] This invention provides wires on the second end face of both the first and second pipe sections in the horizontal direction, with the wires penetrating the interior and exterior of each first and second pipe section. The first pipe sections are connected in series in the horizontal direction via the wires, and the second pipe sections are also connected in series in the horizontal direction via the wires. This allows for electrical signal connectivity between the first and second pipe sections in the horizontal direction, while the electrical signals are not connected in the vertical direction. This enables the simulation of geological data from strata at different orientations and depths through the combination of the first and second pipe sections.

[0025] This invention includes a wellbore simulation module with a water tank for placing logging-while-drilling instruments, which can simulate the real wellbore environment and improve the accuracy of test data.

[0026] The present invention uses a water tank that is constructed into a cylindrical shape, which can be adapted to the shape of the first pipe section, making it easy for the wellbore simulation module to be assembled into the formation simulation module.

[0027] This invention forms a sealed space by sealing two water tank shells together, which prevents water from flowing out of the water tank and avoids adverse effects on the experiment. Attached Figure Description

[0028] Figure 1 A schematic diagram of the overall structure of the logging-while-drilling instrument testing device according to the present invention is shown.

[0029] Figure 2 A schematic diagram of the overall structure of the formation simulation module of the logging-while-drilling instrument testing device according to the present invention is shown.

[0030] Figure 3 A schematic diagram of the overall structure of the first and second sections of the logging-while-drilling instrument testing device according to the present invention is shown.

[0031] Figure 4 A schematic diagram of the overall structure of the wellbore simulation module of the logging-while-drilling instrument testing device according to the present invention is shown.

[0032] Figure 5 A schematic diagram of the exploded structure of the wellbore simulation module of the logging-while-drilling instrument testing device according to the present invention is shown.

[0033] The reference numerals in the drawings of this invention are as follows:

[0034] Logging While Drilling Instrument Testing Device-100; Formation Simulation Module-200; Wellbore Simulation Module-300; First Tube Section-101; Second Tube Section-102; Injection Hole-209; Wire Guide-S; Water Tank-A; Sealing Ring-402; Water Tank Housing-301; Conductive Wire-304; Logging While Drilling Instrument-401; Annular Locking Buckle-303; Water Injection Hole-305.

[0035] In this application, all drawings are schematic and are used only to illustrate the principles of the invention, and are not drawn to scale. Detailed Implementation

[0036] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] In the description of this invention, it should be understood that the terms “inner,” “upper,” “outer,” “lower,” “horizontal,” “vertical,” etc., indicating orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0038] In this invention, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, an integral part, an abutment, or a connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components or an interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0039] like Figure 1 As shown, the logging-while-drilling instrument testing device 100 of the present invention includes a formation simulation module 200 and a wellbore simulation module 300. The formation simulation module 200 is used to simulate geological data of various real formations, which can improve the reliability of test data. The wellbore simulation module 300 is used to simulate the real wellbore environment. The logging-while-drilling instrument is set in the wellbore simulation module 300. The logging-while-drilling instrument can be a logging-while-drilling resistivity instrument or a logging-while-drilling sonic logging instrument. The formation simulation module 200 includes a plurality of first pipe sections 101 and a plurality of second pipe sections 102 disposed on the outer surface of the first pipe sections 101. The inner surface of each second pipe section 102 abuts against the outer surface of each first pipe section 101. The first end faces of the upper and lower first pipe sections 101 abut against each other in the vertical direction so that the inner surfaces of the two first pipe sections 101 form a first receiving space. The second end faces of the two first pipe sections 101 abut against each other in the horizontal direction with the second end faces of the other two first pipe sections 101 in the horizontal direction. The first end faces of the other two first pipe sections 101 abut against each other in the vertical direction to form a first receiving space. The first receiving spaces are interconnected.

[0040] The logging-while-drilling instrument testing device 100 of the present invention includes a formation simulation module 200 and a wellbore simulation module 300. The formation simulation module 200 includes a plurality of first pipe sections 101 and second pipe sections 102 disposed on the outer periphery of the first pipe sections 101. The first end faces of two first pipe sections 101 abut against each other in the vertical direction, and the second end faces in the horizontal direction abut against the second end faces of the other two first pipe sections 101, so that the plurality of first pipe sections 101 achieve formation segmentation in the horizontal direction. The inner surface of each second pipe section 102 abuts against the outer surface of each first pipe section 101, so that the plurality of first pipe sections 101 and the plurality of second pipe sections 102 respectively achieve formation stratification in the vertical direction and simultaneously achieve formation segmentation in the horizontal direction. The formation is segmented upwards, thus simulating radially layered and axially segmented formations. The inner surfaces of multiple first pipe sections 101 form a first accommodating space, within which a wellbore simulation module 300 is installed. This allows the multiple first pipe sections 101 and second pipe sections 102 to achieve formation segmentation in the horizontal direction, and the multiple first pipe sections 101 and multiple second pipe sections 102 to achieve formation stratification in the vertical direction. This enables the simulation of radially layered and axially segmented formations, improving the accuracy of formation simulation and consequently enhancing the accuracy of experimental data measured by the logging-while-drilling instrument testing device. It provides a realistic environment for calibration testing of logging-while-drilling instruments, offering low testing costs and high measurement accuracy, which is of great significance for testing in the early development stage of logging-while-drilling instruments.

[0041] In one or more embodiments, the first end faces of two second tube portions 102 abut against each other in the vertical direction, such that the inner surfaces of the two second tube portions 102 form a second receiving space, and the two first tube portions 101 abutting against each other in the vertical direction are located within the second receiving space. The second end faces of the two second tube portions 102 in the horizontal direction abut against the second end faces of two other second tube portions 102 in the horizontal direction, and the first end faces of the other two second tube portions 102 abut against each other in the vertical direction, to form a second receiving space, and the various second receiving spaces are interconnected.

[0042] This invention uses two second pipe sections 102 whose first end faces in the vertical direction abut against each other, and whose second end faces in the horizontal direction abut against the second end faces of two other second pipe sections 102. The inner surfaces of each second pipe section 102 form a second accommodating space. This allows multiple second pipe sections 102 to achieve formation segmentation in the horizontal direction, and multiple first pipe sections 101 and multiple second pipe sections 102 to achieve formation stratification in the vertical direction. This enables the simulation of radially segmented formations and axially segmented formations, improving the accuracy of formation simulation. Consequently, it improves the accuracy of experimental data measured by the logging-while-drilling instrument testing device. It provides a realistic environment for calibration testing of logging-while-drilling instruments, with low testing costs and high measurement accuracy. This is of great significance for testing in the early development stage of logging-while-drilling instruments.

[0043] It should be noted that the logging-while-drilling instrument testing device 100 of the present invention includes multiple pairs of first tube sections 101 and multiple pairs of second tube sections 102. Each pair of first tube sections 101 has its first end face abutting against each other in the vertical direction, forming a first receiving space on the inner surface of the two first tube sections 101. The second end faces of each pair of first tube sections 101 abut against each other in the horizontal direction, connecting the various first receiving spaces into a single unit. Similarly, each pair of second tube sections 102 has its first end face abutting against each other in the vertical direction, forming a second receiving space on the inner surface of the two second tube sections 102. The second end faces of each pair of second tube sections 102 abut against each other in the horizontal direction, connecting the various second receiving spaces into a single unit. The pairs of second tube sections 102 are fitted around the outer periphery of the pairs of first tube sections 101 and are in contact with each other. A wellbore simulation module 300 is disposed within the first receiving space formed by each pair of first tube sections 101.

[0044] In one or more embodiments, both the first tube 101 and the second tube 102 are configured as fan-shaped bodies, the second tube 102 has the same center as the first tube 101, and the radius of the second tube 102 is larger than the radius of the first tube 101.

[0045] The present invention has the following advantages: the first tube 101 and the second tube 102 are both constructed as fan-shaped bodies, the second tube 102 and the first tube 101 have the same center, and the radius of the second tube 102 is larger than the radius of the first tube 101. On the one hand, by using the paired first tube 101 and second tube 102 to be nested together, the installation process of the logging-while-drilling instrument testing device 100 can be simplified. On the other hand, it can make the first tube 101 and the second tube 102 fit tightly together and maintain the stability of the fit.

[0046] In one or more embodiments, injection holes 209 are provided on the second end face of the first pipe section 101 and the second end face of the second pipe section 102 in the horizontal direction. Optionally, the injection holes 209 are constructed in a cylindrical shape. Fluids with different resistivities or sound velocities are disposed within the injection holes 209. The electrical or acoustic properties of the fluid can be altered by chemical reagents or physical configurations, thereby simulating geological data (e.g., resistivity, sound velocity) of different strata. It should be noted that after the first pipe section 101 and the second pipe section 102 are filled with fluid through the injection holes 209, the injection holes 209 of each of the first pipe section 101 and the second pipe section 102 must be sealed.

[0047] For example, the logging-while-drilling instrument testing device 100 of the present invention includes four first tube sections 101 and four second tube sections 102. The four first tube sections 101 are divided into two pairs. The first end faces of each pair of first tube sections 101 abut against each other in the vertical direction, forming a first receiving space on the inner surfaces of the two first tube sections 101. The second end faces of the two pairs of first tube sections 101 abut against each other in the horizontal direction, so that each first receiving space is connected into a whole. The first end faces of each pair of second tube sections 102 abut against each other in the vertical direction, forming a second receiving space on the inner surfaces of the two second tube sections 102. The second end faces of the two pairs of second tube sections 102 abut against each other in the horizontal direction, so that each second receiving space is connected into a whole. Each pair of second tube sections 102 is fitted around the outer periphery of each pair of first tube sections 101 and is in contact with each other.

[0048] Different fluids are injected into each first pipe section 101 to simulate different formation resistivities, namely R11, R12, R13 and R14. Different fluids are introduced into each second pipe section 102 to simulate different formation resistivities, namely R21, R22, R23 and R24.

[0049] The present invention provides injection holes 209 on the second end faces of the first pipe section 101 and the second pipe section 102 in the horizontal direction, and the injection holes 209 are filled with fluids for simulating different resistivities or sound velocities. It is possible to configure fluids with different properties in the injection holes 209 of each first pipe section 101 and the second pipe section 102. The electrical or acoustic properties of the fluids can be changed by chemical reagents or physical configuration, thereby simulating geological data of different strata.

[0050] In one or more embodiments, each of the first tube sections 101 and the second tube section 102 is provided with a wire s on its second end face in the horizontal direction. The wire s passes through the interior and exterior of each of the first tube sections 101 and the second tube section 102. The first tube sections 101 are connected in series in the horizontal direction by the wires, and the second tube sections 102 are connected in series in the horizontal direction by the wires. It should be noted that the outlet of the wire needs to be sealed.

[0051] The present invention provides wires s on the second end face of the first pipe section 101 and the second pipe section 102 in the horizontal direction, and the wires s pass through the interior and exterior of each first pipe section 101 and the second pipe section 102. The first pipe sections 101 and the second pipe sections 102 are connected in series in the horizontal direction through wires, thereby achieving electrical signal connection between each first pipe section 101 and the second pipe section 102 in the horizontal direction, while the electrical signals are not connected in the vertical direction. It is possible to simulate geological data of strata at different orientations and depths by combining the first pipe sections 101 and the second pipe sections 102.

[0052] In one or more embodiments, the wellbore simulation module 300 of the present invention includes a water tank a for placing logging-while-drilling instruments, the outer surface of the water tank a is in contact with the inner surface of each first tube section 101, and the water tank a has a receiving space filled with water.

[0053] The present invention includes a wellbore simulation module 300, which includes a water tank a for placing logging-while-drilling instruments, which can simulate the real wellbore environment and improve the accuracy of test data.

[0054] In one or more embodiments, the water tank a is constructed in a cylindrical shape. By constructing the water tank a in a cylindrical shape, the present invention can adapt to the shape of the first pipe section 101, facilitating the assembly of the wellbore simulation module 300 within the formation simulation module 200.

[0055] In one or more embodiments, the water tank a includes two water tank housings 301, which are sealed together to form a closed space. Optionally, each of the two water tank housings 301 has a sealing ring 402 at its respective edge, so that the two water tank housings 301 can be sealed at the connection, thereby forming a closed space inside the water tank housings 301. Optionally, the two water tank housings 301 are fixed together by an annular locking buckle 303 to form a cylindrical water tank.

[0056] The present invention forms a sealed space by sealing two water tank shells 301 together, which can form a sealed space inside the water tank shell 301 to prevent water in water tank a from flowing out and avoid adverse effects on the experiment.

[0057] In one or more embodiments, a water tank a has a water injection hole 305 on its horizontal end face. The water injection hole 305 communicates with a sealed space formed inside the water tank housing 301, allowing liquid to be injected into the water tank a. After the liquid is injected, the water injection hole 305 needs to be sealed.

[0058] In one or more embodiments, a conductive line 304 is provided on the end face of the water tank a along the horizontal direction. The conductive line 304 runs through the interior and exterior of the water tank a and is used to connect the signal debugging line of the drilling and logging instrument 401.

[0059] It should be noted that the first tube 101 and the second tube 102 described in this invention can be PVC fan-shaped tubes with a hollow interior to accommodate a certain amount of fluid. The thickness of the first tube 101 and the second tube 102 is the same as the thickness of the formation thin layer, and the length of the first tube 101 and the second tube 102 is greater than the spacing between the instrument receiving units.

[0060] The fluids in the first pipe section 101 and the second pipe section 102 can have their electrical or acoustic properties altered by chemical reagents or physical configurations, thus simulating geological data (resistivity, sound velocity) of different strata.

[0061] The wellbore simulation device consists of two PVC semi-circular water tanks, sealed at the joint, forming a cylindrical water tank a. Water tank a is larger than the instrument under test, large enough to accommodate one instrument. Water tank a is filled with liquid, and the logging-while-drilling instrument is placed horizontally and centrally within it.

[0062] The assembly process of the logging-while-drilling instrument testing device 100 is briefly described below. The logging-while-drilling instrument 401 is placed centrally within the wellbore simulation device 300, and its signal debugging line is connected to the conductive line 304 on the water tank a. The conductive line 304 is then insulated. The paired first tube sections 101 are joined together vertically and horizontally, and the paired second tube sections 102 are joined together vertically and horizontally. The entire assembly consisting of the paired first tube sections 101 is placed inside the entire assembly consisting of the paired second tube sections 102 to form the formation simulation module 200. A formation simulation module 200 is placed outside the wellbore simulation module 300. Water is injected into the wellbore simulation module 300, and fluids of different properties are injected into each of the first pipe sections 101 and the second pipe section 102 of the formation simulation module 200. The electrical or acoustic properties of the fluids can be changed by chemical reagents or physical configurations, thereby simulating geological data of different formations. The signal calibration line of the logging-while-drilling instrument 401 can be led out to perform online calibration testing of the instrument.

[0063] The main beneficial effects of this invention are briefly described below:

[0064] The logging-while-drilling instrument testing device 100 of the present invention includes a formation simulation module 200 and a wellbore simulation module 300. The formation simulation module 200 includes a plurality of first pipe sections 101 and second pipe sections 102 disposed on the outer periphery of the first pipe sections 101. The first end faces of two first pipe sections 101 abut against each other in the vertical direction, and the second end faces in the horizontal direction abut against the second end faces of two other first pipe sections 101. The inner surface of each second pipe section 102 abuts against the outer surface of each first pipe section 101. The inner surfaces of the plurality of first pipe sections 101 form a first receiving space. The wellbore simulation module 300 is installed within the space, enabling multiple first pipe sections 101 and second pipe sections 102 to achieve formation segmentation in the horizontal direction, and multiple first pipe sections 101 and multiple second pipe sections 102 to achieve formation stratification in the vertical direction. This allows for the simulation of radially segmented formations and axially segmented formations, improving the accuracy of formation simulation and, consequently, the accuracy of experimental data measured by the logging-while-drilling instrument testing device. It provides a realistic environment for calibration testing of logging-while-drilling instruments, with low testing costs and high measurement accuracy, which is of great significance for testing in the early development stage of logging-while-drilling instruments.

[0065] This invention uses two second pipe sections 102 whose first end faces in the vertical direction abut against each other, and whose second end faces in the horizontal direction abut against the second end faces of two other second pipe sections 102. The inner surfaces of each second pipe section 102 form a second accommodating space, enabling multiple second pipe sections 102 to achieve formation segmentation in the horizontal direction, and multiple first pipe sections 101 and multiple second pipe sections 102 to achieve formation stratification in the vertical direction. This allows for the simulation of radially segmented formations and axially segmented formations, improving the accuracy of formation simulation and thus improving the accuracy of experimental data measured by the logging-while-drilling instrument testing device. It provides a realistic environment for calibration testing of logging-while-drilling instruments, with low testing costs and high measurement accuracy, which is of great significance for testing in the early development stage of logging-while-drilling instruments.

[0066] The present invention provides injection holes 209 on the second end faces of the first pipe section 101 and the second pipe section 102 in the horizontal direction, and the injection holes 209 are filled with fluids for simulating different resistivities or sound velocities. It is possible to configure fluids with different properties in the injection holes 209 of each first pipe section 101 and the second pipe section 102. The electrical or acoustic properties of the fluids can be changed by chemical reagents or physical configuration, thereby simulating geological data of different strata.

[0067] Although the invention has been described with reference to preferred embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner as long as there is no structural conflict. The invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A logging-while-drilling (LWD) instrument testing device, comprising a formation simulation module and a wellbore simulation module, wherein the wellbore simulation module includes a water tank for placing the LWD instrument, the formation simulation module includes a plurality of first pipe sections and second pipe sections disposed around the periphery of the first pipe sections, both the first and second pipe sections being constructed in a fan shape, two first pipe sections abutting each other at their first end faces in the vertical direction, and their second end faces abutting each other at their second end faces in the horizontal direction, thereby achieving formation segmentation of the plurality of first pipe sections in the horizontal direction, and the inner surface of each second pipe section abutting each outer surface of each first pipe section, thereby enabling the plurality of first pipe sections to respectively abut against the outer surface of the plurality of second pipe sections. The first pipe section vertically achieves formation stratification, while multiple second pipe sections horizontally segment the formation, thereby simulating radially stratified formations and axially segmented formations. The inner surfaces of the multiple first pipe sections form a first accommodating space, within which the wellbore simulation module is installed. The second end faces of the first and second pipe sections are horizontally provided with injection holes, which contain fluids for simulating different resistivities or sound velocities. The first end faces of two second pipe sections abut against each other vertically, and their second end faces abut against the second end faces of two other second pipe sections horizontally. The inner surfaces of each second pipe section form a second accommodating space.

2. The logging-while-drilling instrument testing device according to claim 1, characterized in that, The second tube has the same center as the first tube, and the radius of the second tube is greater than the radius of the first tube.

3. The logging-while-drilling instrument testing device according to claim 2, characterized in that, Both the first tube and the second tube have wires on their second end faces in the horizontal direction. Multiple first tubes are connected by wires, and multiple second tubes are connected by wires.

4. The logging-while-drilling instrument testing device according to claim 2, characterized in that, The outer surface of the water tank is in contact with the inner surface of each of the first pipe sections, and the inside of the water tank has a receiving space filled with water.

5. The logging-while-drilling instrument testing device according to claim 4, characterized in that, The water tank is constructed in a cylindrical shape.

6. The logging-while-drilling instrument testing device according to claim 5, characterized in that, The water tank includes two tank shells, which are sealed together to form a closed space.

7. The logging-while-drilling instrument testing device according to claim 6, characterized in that, The water tank has a water injection hole on its horizontal end face, and the water injection hole is connected to the sealed space formed inside the water tank shell.

8. The logging-while-drilling instrument testing device according to claim 4, characterized in that, The water tank has a conductive wire on its horizontal end face, which runs through the inside and outside of the water tank and is used to connect the signal debugging line of the logging-while-drilling instrument.

9. The logging-while-drilling instrument testing device according to claim 6, characterized in that, Each of the two water tank shells has a sealing ring at its edge, which allows the two water tank shells to be sealed at the connection point, thereby forming a closed space inside the water tank shells.

10. The logging-while-drilling instrument testing device according to claim 9, characterized in that, The two water tank shells are fixed together by a ring-shaped locking buckle to form the water tank.

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