Testing device for logging-while-drilling instrument

Abstract

The invention provides a logging-while-drilling instrument testing device which comprises a stratum simulation module, the stratum simulation module comprises a plurality of first pipe parts and second pipe parts arranged on the peripheries of the first pipe parts, the first end faces, in the vertical direction, of the two first pipe parts abut against each other, and the second end faces, in the horizontal direction, of the two first pipe parts abut against the second end faces of the other two first pipe parts; the inner surface of each second pipe part abuts against the outer surface of the corresponding first pipe part, a first containing space is formed by the inner surfaces of the multiple first pipe parts, and a borehole simulation module is arranged in the first containing space. The device can simulate a radial stratified stratum and an axial segmented stratum, improves the accuracy of experimental data measured by a logging-while-drilling instrument testing device, provides a real environment for scale testing of a logging-while-drilling instrument, is low in testing cost and high in measuring precision, and has important significance in testing of the logging-while-drilling instrument in the initial development stage.

Description

Technical Field

[0001] The present invention relates to the technical field of deep formation oil and gas energy storage, and in particular to a logging while drilling instrument testing device. Background Art

[0002] With the improvement of oilfield exploration and development, resistivity logging while drilling and acoustic logging while drilling are increasingly used in formation evaluation and geosteering. In order to detect the measurement accuracy and working reliability of the instrument, it is necessary to perform calibration tests on the ground.

[0003] Existing instrument calibration tests are usually completed in calibration wells or in water pools. Instrument testing in calibration wells is highly accurate, but the construction cost of calibration wells is relatively high. At the same time, it is very difficult to test non-integrated instruments that are partially sealed or do not have battery short sections. Instrument testing in a water pool cannot reflect the orientation and depth characteristics of the formation. It can only verify the functionality of the instrument, and the test granularity is too coarse. Both tests have great disadvantages. Therefore, it is necessary to develop a dedicated LWD instrument test device to perform calibration tests on the instrument on the ground.

[0004] The prior art discloses a test device for logging while drilling instruments, such as the Chinese invention patent with announcement number CN103198748B, which involves an experimental device for an electrical logging method, comprising: a water tank body, a simulated formation module, a transmission mechanism, a loop electrode, an electrode system group, and a measurement and control instrument. The entire bottom of the water tank body is provided with a loop electrode, and a plurality of simulated formation modules are provided in the water tank body; the axis of the simulated formation module has a simulated wellbore, the shell is filled with a high-resistivity liquid, and the side wall of the simulated wellbore is arranged with a first gold-plated metal probe; the transmission mechanism includes a stepper motor, a transmission wheel, a slider, a traction wire, and a guide rail; the electrode system group includes a skeleton and an electrode system; when the slider moves on the guide rail, it drives the skeleton and the electrode system to move synchronously in the simulated wellbore. Although the experimental device simulates the potential, gradient, and lateral logging response characteristics and laws of different resistivity formations, high resistivity formations of different thicknesses, and high resistivity formation shielding, it cannot simulate radial stratification and axial segmentation formations.

[0005] For another example, the public document "Development and Application of Simulation Experimental Device for Acoustic Logging While Drilling" involves a simulation experimental device for acoustic logging while drilling, including a wellbore, a flange, a plug, a water inlet pipe, an inner pulley and a wellbore support, etc., which can simulate the formations of different hardness around the instrument when it is working underground. However, it is also unable to simulate radially layered and axially segmented formations, and the simulation experimental device is also unable to simulate radially layered and axially segmented formations.

[0006] In summary, the conventional LWD instrument test device cannot simulate radially layered formations and axially segmented formations, resulting in inaccurate formation simulation and inability to accurately simulate real formations, thereby reducing the accuracy of experimental data measured by the LWD instrument test device. Summary of the invention

[0007] An object of the present invention is to provide a logging while drilling instrument testing device that can simulate radially layered formations and axially segmented formations, improve the accuracy of formation simulation, and further improve 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 borehole simulation module, the formation simulation module includes multiple first pipe parts and second pipe parts arranged on the outer periphery of the first pipe parts, the first end faces of two first pipe parts 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 pipe parts, so that the multiple first pipe parts realize formation segmentation in the horizontal direction, the inner surface of each second pipe part abuts against the outer surface of each first pipe part respectively, so that the multiple first pipe parts realize formation stratification in the vertical direction respectively with the multiple second pipe parts and at the same time, the multiple second pipe parts realize formation segmentation in the horizontal direction, so as to simulate radially stratified formations and axially segmented formations, the inner surfaces of the multiple first pipe parts form a first accommodating space, and the borehole simulation module is arranged in the first accommodating space.

[0009] In a preferred embodiment, the first end faces of two second tube parts 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 second tube parts, and the inner surface of each second tube part forms a second accommodating space.

[0010] In a preferred embodiment, the first tube portion and the second tube portion are both configured as fan-shaped bodies, and the second tube portion and the first tube portion have the same center, and the radius of the second tube portion is greater than the radius of the first tube portion.

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

[0012] In a preferred embodiment, the first tube part and the second tube part are both provided with a wire on the second end surface along the horizontal direction, a plurality of the first tube parts are connected by the wire, and a plurality of the second tube parts are connected by the wire.

[0013] In a preferred embodiment, the wellbore simulation module includes a water tank for placing the logging while drilling instrument, the outer surface of the water tank is in contact with the inner surface of each first pipe part, and the water tank has a receiving space inside, and the receiving space is filled with water.

[0014] In a preferred embodiment, the water tank is configured in a cylindrical shape.

[0015] In a preferred embodiment, the water tank includes two water tank shells, and the two water tank shells are sealed and connected to form a closed space.

[0016] In a preferred embodiment, a water injection hole is provided on the end surface of the water tank along the horizontal direction, and the water injection hole is communicated with the closed space formed inside the water tank shell.

[0017] In a preferred embodiment, a conductive wire is provided on the end surface of the water tank along the horizontal direction. The conductive wire runs through the inside and outside of the water tank and is used to connect a signal debugging line of a logging while drilling instrument.

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

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

[0020] The logging while drilling instrument testing device of the present invention comprises a formation simulation module and a borehole simulation module. The formation simulation module comprises a plurality of first pipe parts and a second pipe part arranged on the outer periphery of the first pipe part. The first end faces of the two first pipe parts 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 pipe parts. The inner surface of each second pipe part abuts against the outer surface of each first pipe part respectively. The inner surfaces of the plurality of first pipe parts form a first accommodating space. The borehole simulation module is arranged in the first accommodating space, so that the plurality of first pipe parts and the second pipe parts both realize formation segmentation in the horizontal direction, and the plurality of first pipe parts and the plurality of second pipe parts realize formation stratification in the vertical direction, so that radial stratified formations and axial segmented formations can be simulated, the accuracy of formation simulation is improved, and then the accuracy of experimental data measured by the logging while drilling instrument testing device is improved, and a real environment can be provided for calibration testing of the logging while drilling instrument. The testing cost is low and the measurement accuracy is high, which is of great significance for the testing of the logging while drilling instrument in the initial development stage.

[0021] The present invention forms a second accommodating space on the inner surface of each second pipe portion, by virtue of the first end surfaces of the two second pipe portions abutting against each other in the vertical direction and the second end surfaces of the other two second pipe portions abutting against each other in the horizontal direction. The multiple second pipe portions can realize formation segmentation in the horizontal direction, and the multiple first pipe portions and the multiple second pipe portions can realize formation stratification in the vertical direction, thereby simulating radially stratified formations and axially segmented formations, improving the accuracy of formation simulation, and further improving the accuracy of experimental data measured by the testing device of the logging while drilling instrument, providing a real environment for calibration testing of the logging while drilling instrument, with low testing cost and high measurement accuracy, which is of great significance for the testing of the logging while drilling instrument in the initial development stage.

[0022] The present invention has the first pipe part and the second pipe part both configured as fan-shaped bodies, the second pipe part and the first pipe part have the same center of circle, and the radius of the second pipe part is greater than the radius of the first pipe part. On the one hand, the paired first pipe part and the second pipe part are nested, which can simplify the installation process of the while-drilling logging instrument test device. On the other hand, the first pipe part and the second pipe part can be tightly fitted together to maintain matching stability.

[0023] The present invention has injection holes opened in the horizontal direction on the second end faces of the first tube part and the second tube part, and fluids for simulating fluids with different resistivities or sound velocities are arranged in the injection holes. Fluids with different properties can be configured in the injection holes of each of the first tube part and the second tube part, wherein the electrical properties or acoustic properties of the fluid can be changed by chemical reagents or physical configuration, thereby simulating geological data of different strata.

[0024] The present invention provides conductive wires on the second end faces of the first pipe part and the second pipe part in the horizontal direction, and the conductive wires penetrate the interior and the exterior of each of the first pipe part and the second pipe part, and the first pipe part is connected in series in the horizontal direction through the conductive wires, and the second pipe part is connected in series in the horizontal direction through the conductive wires, so that the electrical signals of each of the first pipe part and the second pipe part are connected in the horizontal direction, respectively, and the electrical signals are not connected in the vertical direction, and the geological data of different orientations and different depths of strata can be simulated through the combination of the first pipe part and the second pipe part.

[0025] The present invention can simulate a real wellbore environment and improve the accuracy of test data by including a water tank for placing a logging while drilling instrument in the wellbore simulation module.

[0026] The water tank of the present invention is configured into a cylindrical shape, which can be adapted to the shape of the first pipe part, so that the wellbore simulation module can be easily assembled in the formation simulation module.

[0027] The present invention forms a closed space by sealingly connecting two water tank shells, so that a closed space can be formed inside the water tank shells, thereby preventing water in the water tank from flowing out and avoiding adverse effects on experiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram schematically shows the overall structure of a testing device for a logging while drilling instrument according to the present invention;

[0029] Figure 2 A schematic diagram schematically shows the overall structure of a formation simulation module of a logging while drilling instrument testing device according to the present invention;

[0030] Figure 3 A schematic diagram schematically shows the overall structure of the first pipe part and the second pipe part of the logging while drilling instrument testing device according to the present invention;

[0031] Figure 4 A schematic diagram schematically shows the overall structure of a borehole simulation module of a logging while drilling instrument testing device according to the present invention;

[0032] Figure 5 The schematic diagram schematically shows the exploded structure of the borehole simulation module of the logging while drilling instrument testing device according to the present invention.

[0033] The accompanying drawings of the present invention are as follows:

[0034] Logging while drilling instrument testing device-100; formation simulation module-200; borehole simulation module-300; first pipe part-101; second pipe part-102; injection hole-209; wire-s; water tank-a; sealing ring-402; water tank shell-301; conductive wire-304; logging while drilling instrument-401; annular locking buckle-303; water injection hole-305.

[0035] In the present application, all drawings are schematic drawings, which are only used to illustrate the principles of the present invention and are not drawn according to the actual scale. DETAILED DESCRIPTION

[0036] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] In the description of the present invention, it is necessary to understand that the terms "inside", "upper", "outer", "lower", "horizontal", "vertical", etc. mentioned herein indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0038] In the present invention, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral or abutting or communicating 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 the internal communication of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

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

[0040] The logging while drilling instrument testing device 100 of the present invention comprises a formation simulation module 200 and a borehole simulation module 300. The formation simulation module 200 comprises a plurality of first pipe sections 101 and a second pipe section 102 arranged on the periphery of the first pipe section 101. The first end faces of the two first pipe sections 101 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 pipe sections 101, so that the plurality of first pipe sections 101 realize formation segmentation in the horizontal direction, and 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 realize formation stratification in the vertical direction respectively with the plurality of second pipe sections 102 and at the same time the plurality of second pipe sections 102 realize formation stratification in the horizontal direction. The formation is segmented upward, so that radially layered formations and axially segmented formations can be simulated. The inner surfaces of the multiple first pipe parts 101 form a first accommodating space, and a wellbore simulation module 300 is arranged in the first accommodating space, so that the multiple first pipe parts 101 and the second pipe parts 102 can both achieve formation segmentation in the horizontal direction, and the multiple first pipe parts 101 and the multiple second pipe parts 102 can achieve formation stratification in the vertical direction, so that radially layered formations and axially segmented formations can be simulated, thereby improving the accuracy of formation simulation, and further improving the accuracy of experimental data measured by the testing device of the logging while drilling instrument, and being able to provide a real environment for calibration testing of the logging while drilling instrument, with low testing cost and high measurement accuracy, which is of great significance for the testing of the logging while drilling instrument in the initial development stage.

[0041] In one or more embodiments, the first end faces of the two second tubes 102 along the vertical direction abut against each other, so that the inner surfaces of the two second tubes 102 form a second accommodation space, and the two first tubes 101 whose first end faces abut against each other along the vertical direction are located in the second accommodation space. The second end faces of the two second tubes 102 along the horizontal direction abut against the second end faces of the other two second tubes 102 along the horizontal direction, respectively, and the first end faces of the other two second tubes 102 along the vertical direction abut against each other to form a second accommodation space, and each second accommodation space is connected to each other.

[0042] In the present invention, the first end faces of the two second pipe parts 102 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 second pipe parts 102, and the inner surface of each second pipe part 102 forms a second accommodating space, so that the multiple second pipe parts 102 can achieve formation segmentation in the horizontal direction, and the multiple first pipe parts 101 and the multiple second pipe parts 102 can achieve formation stratification in the vertical direction, so as to simulate radially stratified formations and axially segmented formations, improve the accuracy of formation simulation, and further improve the accuracy of experimental data measured by the testing device of the logging while drilling instrument, and can provide a real environment for calibration testing of the logging while drilling instrument, with low testing cost and high measurement accuracy, which is of great significance for the testing of the logging while drilling instrument in the initial development stage.

[0043] It should be noted that the logging while drilling instrument testing device 100 of the present invention includes a plurality of pairs of first pipe parts 101 and a plurality of pairs of second pipe parts 102, wherein the first end faces of each pair of first pipe parts 101 in the vertical direction abut against each other so that the inner surfaces of the two first pipe parts 101 form a first accommodation space, and the second end faces of each pair of first pipe parts 101 in the horizontal direction abut against each other so that each first accommodation space is connected to form a whole. The first end faces of each pair of second pipe parts 102 in the vertical direction abut against each other so that the inner surfaces of the two second pipe parts 102 form a second accommodation space, and the second end faces of each pair of second pipe parts 102 in the horizontal direction abut against each other so that each second accommodation space is connected to form a whole. The paired second pipe parts 102 are sleeved on the outer periphery of the paired first pipe parts 101 and contact each other. A wellbore simulation module 300 is arranged in the first accommodation space formed by each pair of first pipe parts 101.

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

[0045] In the present invention, the first pipe portion 101 and the second pipe portion 102 are both constructed as fan-shaped bodies, the second pipe portion 102 and the first pipe portion 101 have the same center of the circle, and the radius of the second pipe portion 102 is greater than the radius of the first pipe portion 101. On the one hand, the paired first pipe portion 101 and the second pipe portion 102 are nested, which can simplify the installation process of the while drilling logging instrument test device 100. On the other hand, the first pipe portion 101 and the second pipe portion 102 can be tightly fitted to maintain the matching stability.

[0046] In one or more embodiments, the second end surface of the first pipe portion 101 and the second end surface of the second pipe portion 102 are both provided with injection holes 209 in the horizontal direction. Optionally, the injection hole 209 is configured in a cylindrical shape. The injection hole 209 is provided with fluids for simulating fluids with different resistivities or sound velocities. The fluid can change its electrical properties or acoustic properties through chemical reagents or physical configurations, so that geological data (for example, resistivity, sound velocity) of different strata can be simulated. It should be noted that the first pipe portion 101 and the second pipe portion 102 are filled with fluid through the injection holes 209. After the fluid is injected, the injection holes 209 of each of the first pipe portion 101 and the second pipe portion 102 need to be sealed.

[0047] For example, the logging while drilling instrument testing device 100 of the present invention includes 4 first pipe parts 101 and 4 second pipe parts 102. The 4 first pipe parts 101 are divided into two groups of pairs of first pipe parts 101, and the first end faces of each pair of first pipe parts 101 in the vertical direction abut against each other so that the inner surfaces of the two first pipe parts 101 form a first accommodation space, and the second end faces of the two pairs of first pipe parts 101 in the horizontal direction abut against each other so that each first accommodation space is connected to form a whole. The first end faces of each pair of second pipe parts 102 in the vertical direction abut against each other so that the inner surfaces of the two second pipe parts 102 form a second accommodation space, and the second end faces of the two pairs of second pipe parts 102 in the horizontal direction abut against each other so that each second accommodation space is connected to form a whole. Each pair of second pipe parts 102 is sleeved on the outer periphery of each pair of first pipe parts 101 and contacts each other.

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

[0049] The present invention provides injection holes 209 in the horizontal direction on the second end faces of the first tube portion 101 and the second tube portion 102, and fluids having different resistivities or sound velocities are provided in the injection holes 209. Fluids with different properties can be configured in the injection holes 209 of each of the first tube portion 101 and the second tube portion 102, wherein the electrical or acoustic properties of the fluid can be changed by chemical reagents or physical configurations, thereby simulating geological data of different strata.

[0050] In one or more embodiments, each first tube part 101 and each second tube part 102 are provided with a wire s on the second end surface along the horizontal direction. The wire s runs through the inside and outside of each first tube part 101 and each second tube part 102. Each first tube part 101 is connected in series in the horizontal direction through the wire, and each second tube part 102 is connected in series in the horizontal direction through the wire. It should be noted that the wire outlet needs to be sealed.

[0051] According to the present invention, a conductor s is arranged on the second end face of the first pipe part 101 and the second pipe part 102 along the horizontal direction, and the conductor s penetrates the inside and the outside of each of the first pipe parts 101 and the second pipe parts 102, and the first pipe parts 101 are connected in series in the horizontal direction through the conductor, and the second pipe parts 102 are connected in series in the horizontal direction through the conductor, so that the electrical signals of each of the first pipe parts 101 and the second pipe parts 102 are connected in the horizontal direction, but the electrical signals are not connected in the vertical direction, and the geological data of different orientations and different depths of strata can be simulated through the combination of the first pipe part 101 and the second pipe part 102.

[0052] In one or more embodiments, the wellbore simulation module 300 described in the present invention includes a water tank a for placing a logging while drilling instrument, the outer surface of the water tank a contacts the inner surface of each first pipe part 101, and the inside of the water tank a has a accommodating space filled with water.

[0053] The present invention can simulate the real wellbore environment and improve the accuracy of test data by including a water tank a for placing a logging while drilling instrument in the wellbore simulation module 300.

[0054] In one or more embodiments, the water tank a is configured as a cylindrical shape. In the present invention, the water tank a is configured as a cylindrical shape, which can be adapted to the shape of the first pipe part 101 , so that the wellbore simulation module 300 can be assembled in the formation simulation module 200 .

[0055] In one or more embodiments, the water tank a includes two water tank shells 301, and the two water tank shells 301 are sealed and connected to form a closed space. Optionally, the two water tank shells 301 are provided with sealing rings 402 at their respective edges, so that the two water tank shells 301 can be sealed at the connection, thereby forming a closed space inside the water tank shells 301. Optionally, the two water tank shells 301 are fixed together by an annular locking buckle 303 to form a cylindrical water tank.

[0056] The present invention forms a closed space by sealingly connecting two water tank shells 301 , so that a closed space can be formed inside the water tank shell 301 , thereby preventing water in the water tank a from flowing out and avoiding adverse effects on the experiment.

[0057] In one or more embodiments, a water injection hole 305 is provided on the end surface of the water tank a in the horizontal direction, and the water injection hole 305 is connected to the closed space formed inside the water tank housing 301, and liquid can be filled into the water tank a through the water injection hole 305. After the liquid is injected, the water injection hole 305 needs to be sealed.

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

[0059] It should be noted that the first pipe part 101 and the second pipe part 102 of the present invention can be PVC fan-shaped pipes, which are hollow inside and can accommodate a certain amount of fluid. The thickness of the first pipe part 101 and the second pipe part 102 is consistent with the thickness of the thin layer of the formation, and the length of the first pipe part 101 and the second pipe part 102 is greater than the spacing of the instrument receiving unit.

[0060] The electrical or acoustic properties of the fluid in the first pipe part 101 and the second pipe part 102 can be changed by chemical reagents or physical configurations, and the geological data (resistivity, sound velocity) of different strata can be simulated.

[0061] The borehole simulation device consists of two PVC semicircular water tanks, the joint of the two water tanks is sealed, and together they form a cylindrical water tank a. The size of water tank a is larger than the size of the instrument to be tested, enough to accommodate an instrument. Water tank a is filled with liquid, and the logging while drilling instrument is placed flat in the center of water tank a.

[0062] The following briefly describes the assembly process of the logging while drilling instrument test device 100. The logging while drilling instrument 401 is placed centrally in the borehole simulation device 300, and its signal debugging line is connected to the conductive line 304 on the water tank a, and then the conductive line 304 is insulated. The end faces of the paired first pipe parts 101 in the vertical direction are abutted, and the end faces of the paired first pipe parts 101 in the horizontal direction are abutted, the end faces of the paired second pipe parts 102 in the vertical direction are abutted, and the end faces of the paired second pipe parts 102 in the horizontal direction are abutted, and the whole composed of the paired first pipe parts 101 is set inside the whole composed of the paired second pipe parts 102 to form a formation simulation module 200. The formation simulation module 200 is placed outside the wellbore simulation module 300, and the wellbore simulation module 300 is filled with water. The first pipe part 101 and the second pipe part 102 of the formation simulation module 200 are filled with fluids of different properties, wherein the fluid can change its electrical or acoustic properties through chemical reagents or physical configurations, so as to simulate the geological data of different formations, and the signal debugging line of the logging while drilling instrument 401 can be brought out to carry out the online calibration test of the instrument.

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

[0064] The logging while drilling instrument testing device 100 of the present invention comprises a formation simulation module 200 and a borehole simulation module 300. The formation simulation module 200 comprises a plurality of first pipe sections 101 and a second pipe section 102 arranged on the periphery of the first pipe section 101. The first end surfaces of the two first pipe sections 101 in the vertical direction abut against each other, and the second end surfaces in the horizontal direction abut against the second end surfaces of the other two first pipe sections 101. The inner surface of each second pipe section 102 abuts against the outer surface of each first pipe section 101, and the inner surfaces of the plurality of first pipe sections 101 form a first accommodating space. A wellbore simulation module 300 is arranged in the nanospace, so that the multiple first pipe parts 101 and the second pipe parts 102 can realize formation segmentation in the horizontal direction, and the multiple first pipe parts 101 and the multiple second pipe parts 102 can realize formation stratification in the vertical direction, so as to simulate radially stratified formations and axially segmented formations, improve the accuracy of formation simulation, and further improve the accuracy of experimental data measured by the while-drilling logging instrument testing device, and provide a real environment for calibration testing of the while-drilling logging instrument, with low testing cost and high measurement accuracy, which is of great significance for the testing of the while-drilling logging instrument in the initial development stage.

[0065] In the present invention, the first end faces of the two second pipe parts 102 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 second pipe parts 102, and the inner surface of each second pipe part 102 forms a second accommodating space, so that the multiple second pipe parts 102 can realize formation segmentation in the horizontal direction, and the multiple first pipe parts 101 and the multiple second pipe parts 102 can realize formation stratification in the vertical direction, so as to simulate radially stratified formations and axially segmented formations, improve the accuracy of formation simulation, and further improve the accuracy of experimental data measured by the testing device of the logging while drilling instrument, and can provide a real environment for calibration testing of the logging while drilling instrument, with low testing cost and high measurement accuracy, which is of great significance for the testing of the logging while drilling instrument in the initial development stage.

[0066] The present invention provides injection holes 209 in the horizontal direction on the second end faces of the first tube portion 101 and the second tube portion 102, and fluids having different resistivities or sound velocities are provided in the injection holes 209. Fluids with different properties can be configured in the injection holes 209 of each of the first tube portion 101 and the second tube portion 102, wherein the electrical or acoustic properties of the fluid can be changed by chemical reagents or physical configurations, thereby simulating geological data of different strata.

[0067] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present 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 instrument testing device, comprising a formation simulation module and a borehole simulation module, wherein the formation simulation module comprises a plurality of first pipe sections and a second pipe section arranged on the outer periphery of the first pipe section, the first end faces of two first pipe 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 pipe sections, so that the plurality of first pipe sections realize formation segmentation in the horizontal direction, the inner surface of each second pipe section abuts against the outer surface of each first pipe section respectively, so that the plurality of first pipe sections realize formation stratification in the vertical direction respectively with the plurality of second pipe sections and at the same time the plurality of second pipe sections realize formation segmentation in the horizontal direction, thereby being able to simulate radially stratified formations and axially segmented formations, the inner surfaces of the plurality of first pipe sections form a first accommodating space, and the borehole simulation module is arranged in the first accommodating space.

2. The logging while drilling instrument testing device according to claim 1, characterized in that: The first end surfaces of the two second tube parts along the vertical direction abut against each other, and the second end surfaces along the horizontal direction abut against the second end surfaces of the other two second tube parts, and the inner surface of each second tube part forms a second accommodating space.

3. The logging while drilling instrument testing device according to claim 2, characterized in that: The first tube portion and the second tube portion are both configured as fan-shaped bodies, and the second tube portion and the first tube portion have the same center of a circle, and a radius of the second tube portion is greater than a radius of the first tube portion.

4. The logging while drilling instrument testing device according to claim 2, characterized in that: The second end surface of the first tube part and the second end surface of the second tube part are both provided with injection holes in the horizontal direction, and fluids for simulating fluids with different resistivities or sound velocities are arranged in the injection holes.

5. The logging while drilling instrument testing device according to claim 4, characterized in that: The first tube part and the second tube part are both provided with a wire on the second end surface along the horizontal direction, a plurality of the first tube parts are connected by the wire, and a plurality of the second tube parts are connected by the wire.

6. The logging while drilling instrument testing device according to claim 2, characterized in that: The wellbore simulation module comprises a water tank for placing a logging while drilling instrument, the outer surface of the water tank contacts the inner surface of each first pipe part, the water tank has a receiving space inside, and the receiving space is filled with water.

7. The logging while drilling instrument testing device according to claim 6, characterized in that: The water tank is configured in a cylindrical shape.

8. The logging while drilling instrument testing device according to claim 7, characterized in that: The water tank comprises two water tank shells, and the two water tank shells are sealed and connected to form a closed space.

9. The logging while drilling instrument testing device according to claim 8, characterized in that: The end surface of the water tank along the horizontal direction is provided with a water injection hole, and the water injection hole is communicated with the closed space formed inside the water tank shell.

10. The logging while drilling instrument testing device according to claim 6, characterized in that: The end surface of the water tank along the horizontal direction is provided with a conductive wire, 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.

11. The logging while drilling instrument testing device according to claim 8, characterized in that: The two water tank shells are provided with sealing rings at their respective edges, so that the two water tank shells can be sealed at the connection, thereby forming a closed space inside the water tank shells.

12. The logging while drilling instrument testing device according to claim 11, characterized in that: The two water tank shells are fixed together by an annular locking buckle to form the water tank.

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