System for testing stress while drilling

Abstract

The present application relates to a kind of stress testing systems while drilling, including first installation hole, second installation hole, third installation hole and fourth installation hole being opened on the side wall of drill collar;Wherein: first installation hole and second installation hole are located in the first cross section perpendicular to the direction of drill collar axis, and the included angle between the axis of first installation hole and the axis of second installation hole is 180 degrees;Third installation hole and fourth installation hole are located in the second cross section perpendicular to the direction of drill collar axis, and the included angle between the axis of third installation hole and the axis of fourth installation hole is 180 degrees, the included angle between the axis of first installation hole and the axis of third installation hole is 90 degrees;First installation hole, second installation hole, third installation hole and fourth installation hole are respectively installed with a sensor module.The setting of installation hole and sensor module in the present application can be used to measure drill collar torque, bending moment and WOB, and it is convenient to more comprehensively understand the downhole stress condition of drill collar.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of downhole stress testing, and particularly relates to a while-drilling stress testing system. BACKGROUND

[0002] In a deep well with high temperature and high pressure, the load strength borne by a drilling tool is large, and the downhole weight on bit and torque are not easy to control, so the drilling tool is more likely to be damaged. Meanwhile, due to large friction of a drilling string in a horizontal well, the real weight on bit cannot be understood according to a hanging load table, and the weight on bit is blindly applied, which not only affects the borehole size, wellbore quality, but also affects the safety of drilling.

[0003] In addition, the formation has great uncertainty, and the underground conditions encountered in the drilling process are different. Since the downhole working environment is poor and the geological conditions are complex, and the data transmission time delay exists in the ground instrument measurement, it is difficult to reflect the deficiency of the downhole condition in time, therefore, the downhole measurement gradually develops in the direction of near-bit, real-time and multi-parameter.

[0004] In addition, understanding the strength reserve (safety factor) of the downhole tool and the downhole string, and determining the operation limit (weight on bit and torque, etc.) to reduce uncertainty, reduce well testing and drilling cost, and at the same time, strengthen safety and improve operation efficiency, is one of the research directions focused on in the field of while-drilling measurement. The stiffness, strength and stability of the drilling string are mainly determined by the weight on bit and torque borne by the drilling string, and the deformation, stress and strain responses of the drilling string reflect the stiffness, strength and stability of the drilling string. Therefore, how to measure the stress borne by the downhole instrument becomes a problem to be solved. SUMMARY

[0005] In order to solve all or part of the above problems, the present application aims to provide a while-drilling stress testing system.

[0006] According to one aspect of the present application, a while-drilling stress testing system is provided, comprising a first mounting hole, a second mounting hole, a third mounting hole and a fourth mounting hole which are arranged on the side wall of a drill collar; wherein:

[0007] The first mounting hole and the second mounting hole are located in a first cross section perpendicular to the axis direction of the drill collar, and the included angle between the axis of the first mounting hole and the axis of the second mounting hole is 180 degrees;

[0008] The third mounting hole and the fourth mounting hole are located in a second cross section perpendicular to the axis direction of the drill collar, the first cross section and the second cross section do not coincide, and the included angle between the axis of the third mounting hole and the axis of the fourth mounting hole is 180 degrees, and the included angle between the axis of the first mounting hole and the axis of the third mounting hole is 90 degrees;

[0009] A sensor module is installed in each of the first, second, third, and fourth mounting holes. The sensor module is used to measure the torque on the drill collar, the first bending moment about the axis of the first mounting hole, the second bending moment about the axis of the third mounting hole, and the drilling pressure on the drill collar.

[0010] Furthermore, each of the sensor modules includes a sensor substrate, two first strain gauges, two second strain gauges, and two third strain gauges; wherein:

[0011] Each of the first strain gauges is attached to the corresponding sensor substrate at a 45-degree angle. The attachment directions of two first strain gauges on the same sensor substrate are perpendicular to each other. The first strain gauges are used to form a bridge to measure the torque on the drill collar.

[0012] Of the two second strain gauges on the same sensor substrate, one second strain gauge is a transverse gauge perpendicular to the axis of the drill collar, and the other second strain gauge is a vertical gauge parallel to the axis of the drill collar. The second strain gauges are used to connect to form a bridge to measure the first bending moment and to connect to form a bridge to measure the second bending moment.

[0013] Of the two third strain gauges on the same sensor substrate, one third strain gauge is a transverse gauge perpendicular to the axis of the drill collar, and the other third strain gauge is a vertical gauge parallel to the axis of the drill collar. The third strain gauges are connected to form a bridge to measure the drilling pressure on the drill collar.

[0014] Furthermore, each of the first strain gauge, each of the second strain gauge, and each of the third strain gauges are connected to the sensor substrate by thin-film sputtering, and the sensor substrate is made of the same material as the drill collar, and the sensor substrate is welded to the drill collar.

[0015] Furthermore, one of the first strain gauges in the first mounting hole and the corresponding first strain gauge in the second mounting hole are connected in series to form a first bridge arm, and the other first strain gauge in the first mounting hole and the other first strain gauge in the second mounting hole are connected in series to form a second bridge arm.

[0016] One of the first strain gauges in the third mounting hole and the corresponding first strain gauge in the fourth mounting hole are connected in series to form a third bridge arm; the other first strain gauge in the third mounting hole and the other first strain gauge in the fourth mounting hole are connected in series to form a fourth bridge arm.

[0017] The first bridge arm, the second bridge arm, the third bridge arm and the fourth bridge arm constitute a torque measurement full-bridge circuit, and the torque measurement full-bridge circuit is used for measuring the torque.

[0018] Further, two of the second strain gauges in the first mounting hole constitute two bridge arms, two of the second strain gauges in the second mounting hole constitute two bridge arms, and four of the bridge arms constitute a first bending moment measurement full-bridge circuit, and the first bending moment measurement full-bridge circuit is used for measuring the first bending moment.

[0019] Further, two of the second strain gauges in the first mounting hole constitute two bridge arms, two of the second strain gauges in the second mounting hole constitute two bridge arms, and four of the bridge arms constitute a second bending moment measurement full-bridge circuit, and the second bending moment measurement full-bridge circuit is used for measuring the second bending moment.

[0020] Further, the transverse piece of the third strain gauge in the first mounting hole and the transverse piece of the third strain gauge in the second mounting hole are connected in series to constitute a first bridge arm, and the transverse piece of the third strain gauge in the third mounting hole and the transverse piece of the third strain gauge in the fourth mounting hole are connected in series to constitute a second bridge arm opposite to the first bridge arm.

[0021] The other one of the third strain gauges in the first mounting hole and the other one of the third strain gauges in the second mounting hole are connected in series to constitute a third bridge arm.

[0022] The other one of the third strain gauges in the third mounting hole and the other one of the third strain gauges in the fourth mounting hole are connected in series to constitute a fourth bridge arm.

[0023] The first bridge arm, the second bridge arm, the third bridge arm and the fourth bridge arm constitute a torque measurement full-bridge circuit, and the torque measurement full-bridge circuit is used for measuring the torque.

[0024] Further, the side wall of the drill collar is further provided with a fifth mounting hole and a sixth mounting hole, the fifth mounting hole and the sixth mounting hole are located in a third cross section perpendicular to the axis direction of the drill collar, the included angle between the axis of the fifth mounting hole and the axis of the sixth mounting hole is 180 degrees, the third cross section does not coincide with the first cross section, and the third cross section does not coincide with the second cross section.

[0025] The axis of the fifth mounting hole and the axis of the first mounting hole are parallel to each other.

[0026] The sensor module is arranged in the fifth mounting hole and the sixth mounting hole.

[0027] Further, the transverse piece in the third strain gauge in the third mounting hole and the transverse piece in the third strain gauge in the fourth mounting hole are connected in series to form a first bridge arm, and the transverse piece in the third strain gauge in the fifth mounting hole and the transverse piece in the third strain gauge in the sixth mounting hole are connected in series to form a second bridge arm corresponding to the first bridge arm;

[0028] Another third strain gauge in the third mounting hole and another third strain gauge in the fourth mounting hole are connected in series to form a third bridge arm;

[0029] Another third strain gauge in the fifth mounting hole and another third strain gauge in the sixth mounting hole are connected in series to form a fourth bridge arm;

[0030] The first bridge arm, the second bridge arm, the third bridge arm and the fourth bridge arm form a full-bridge circuit for measuring the drilling pressure.

[0031] Further, the vertical piece in the second strain gauge in the first mounting hole, the vertical piece in the second strain gauge in the second mounting hole, the vertical piece in the second strain gauge in the fifth mounting hole and the vertical piece in the second strain gauge in the sixth mounting hole form a bridge arm respectively, and four bridge arms form a full-bridge circuit for measuring the second bending moment.

[0032] According to the technical solution, the drilling stress testing system has the following advantages

[0033] Advantages:

[0034] In the present application, the mounting holes and the sensor module can be used to measure the drilling torque, the first bending moment, the second bending moment and the drilling pressure, and the bending moment received by the drill collar can be calculated according to the first bending moment and the second bending moment, so that the downhole stress of the drill collar can be comprehensively understood.

[0035] In the present application, the mounting holes are located in two or three cross sections, so that the strength of the drill collar can be improved. DETAILED DESCRIPTION

[0036] Figure 1 FIG. 1 is a schematic diagram of a drilling stress testing system according to an embodiment of the present application;

[0037] Figure 2 FIG. 2 is a schematic diagram of a sensor module according to an embodiment of the present application;

[0038] Figure 3 FIG. 3 is a schematic diagram of any one of the mounting holes according to an embodiment of the present application;

[0039] Figure 4 This is a schematic diagram of a drilling stress testing system according to another embodiment of the present invention;

[0040] The reference numerals in the figure are: drill collar 10, first mounting hole 01, second mounting hole 02, third mounting hole 03, fourth mounting hole 04, fifth mounting hole 05, sixth mounting hole 06, first strain gauge 20, second strain gauge 30, and third strain gauge 40. Detailed Implementation

[0041] To better understand the purpose, structure, and function of this invention, a drilling stress testing system of this invention will be described in further detail below with reference to the accompanying drawings.

[0042] like Figure 1 As shown, a three-dimensional XYZ coordinate system is established for the drill collar. For the drill collar 10 placed with its axis vertical, the positive X-axis points horizontally to the right, the positive Z-axis points vertically upwards, and the positive Y-axis points inwards perpendicular to the plane containing the X and Z axes. For the drill collar 10 positioned vertically, the positive X-axis points horizontally to the right, the positive Z-axis points vertically upwards, and the positive Y-axis points inwards perpendicular to the plane containing the X and Z axes. Figure 1 The drill collar 10 in the XYZ three-dimensional coordinate system is subjected to drilling pressure P during actual operation. 压 Drilling fluid pressure P 液 Torque T, second bending moment W about the X-axis X and the first bending moment W about the Y-axis Y The bending moment on the drill collar can be calculated based on the first and second bending moments. By understanding the magnitude of the above forces in a timely manner, the downhole stress on the drill collar 10 can be comprehensively measured.

[0043] like Figure 1 The diagram illustrates a drilling stress testing system according to an embodiment of the present invention, comprising a first mounting hole 01, a second mounting hole 02, a third mounting hole 03, and a fourth mounting hole 04 formed on the sidewall of a drill collar 10; wherein: the first mounting hole 01 and the second mounting hole 02 are located in a first cross-section perpendicular to the axial direction of the drill collar 10, and the included angle between the axis of the first mounting hole 01 and the axis of the second mounting hole 02 is 180 degrees; the third mounting hole 03 and the fourth mounting hole 04 are located in a second cross-section perpendicular to the axial direction of the drill collar 10. Within two cross-sections, the first cross-section and the second cross-section do not coincide, and the angle between the axis of the third mounting hole 03 and the axis of the fourth mounting hole 04 is 180 degrees, while the angle between the axis of the first mounting hole 01 and the axis of the third mounting hole 03 is 90 degrees. A sensor module is installed in each of the first mounting hole 01, the second mounting hole 02, the third mounting hole 03, and the fourth mounting hole 04. The sensor modules are used to measure the torque T of the drill collar 10 and the first bending moment W around the axis of the first mounting hole 01. YThe second bending moment W about the axis of the third mounting hole 03 X and the drilling pressure P experienced by the drill collar 10 压 Then, the bending moment on the drill collar can be calculated based on the first bending moment and the second bending moment.

[0044] In this embodiment, the mounting holes on the drill collar 10 for mounting the sensor module are arranged in two rows of four holes, that is: the first mounting hole 01 and the second mounting hole 02 are located in one row, and the axes of the first mounting hole 01 and the second mounting hole 02 coincide; the third mounting hole 03 and the fourth mounting hole 04 are located in one row, and the axes of the third mounting hole 03 and the fourth mounting hole 04 coincide; in addition, the axis of the first mounting hole 01 is perpendicular to the axis of the third mounting hole 03. Figure 1 As shown, the axes of the first mounting hole 01 and the second mounting hole 02 are located in the Y-axis direction, while the axes of the third mounting hole 03 and the fourth mounting hole 04 are located in the X-axis direction. Furthermore, a sensor module is installed in each mounting hole. This sensor module is used to measure the torque T of the drill collar 10 and the first bending moment W about the axis of the first mounting hole 01. Y The second bending moment W about the axis of the third mounting hole 03 X The drill collar 10 is subjected to drilling pressure P, and the magnitude of the bending moment can be calculated based on the first bending moment and the second bending moment, so as to have a more comprehensive understanding of the downhole stress on the drill collar 10.

[0045] Example 1: As Figure 2 As shown, each sensor module includes a sensor substrate, two first strain gauges 20, two second strain gauges 30, and two third strain gauges 40; wherein: each first strain gauge 20 is attached to the corresponding sensor substrate at a 45-degree angle, and the attachment directions of the two first strain gauges 20 on the same sensor substrate are perpendicular to each other, and the first strain gauges 20 are used to form a bridge to measure the torque of the drill collar 10; of the two second strain gauges 30 on the same sensor substrate, one of the second strain gauges 30 is aligned with the axis of the drill collar 10. One of the second strain gauges 30 is a horizontal strain gauge perpendicular to the axis of the drill collar 10, and the other is a vertical strain gauge parallel to the axis of the drill collar 10. The second strain gauges 30 are used to connect to form a bridge to measure the first bending moment and the second bending moment. Of the two third strain gauges 40 on the same sensor substrate, one third strain gauge 40 is a horizontal strain gauge perpendicular to the axis of the drill collar 10, and the other third strain gauge 40 is a vertical strain gauge parallel to the axis of the drill collar 10. The third strain gauges 40 are used to connect to form a bridge to measure the drilling pressure on the drill collar 10.

[0046] In this embodiment, the sensor module adopts a modular design. Each sensor module includes a sensor substrate, a first strain gauge 20, a second strain gauge 30, and a third strain gauge 40. When it is necessary to understand the stress condition of the drill collar 10, the corresponding strain gauge can be selected and connected to a bridge circuit to measure the stress condition. Specifically, the first strain gauge 20 is used to measure the torque on the drill collar 10, the second strain gauge 30 is used to measure the first bending moment and the second bending moment, and the third strain gauge 40 is used to measure the drilling pressure. Due to the different forces being measured, the relative positions of the first strain gauge 20, the second strain gauge 30, and the third strain gauge 40 are different. In this embodiment, the sensor module adopts a modular design. In specific use, the specific strain gauge bridge circuit can be selected according to the different forces to be measured, thereby facilitating the mounting of the first strain gauge 20 and the second strain gauge 30 and the installation of the sensor module, and reducing the difficulty of strain gauge installation.

[0047] Each sensor module includes two first strain gauges 20, two second strain gauges 30, and two third strain gauges 40, as follows: Figure 2 As shown, an X2-Y2 coordinate system is established for the sensor module. The angle between each first strain gauge and the negative Y2 direction is 45 degrees. The two first strain gauges on each sensor module are perpendicular to each other. Alternatively, each first strain gauge can be set to have an angle of 45 degrees with the positive Y2 direction. The angle between the two second strain gauges is 90 degrees, and one of the second strain gauges is parallel to the X2 axis. The two third strain gauges are set in the same way.

[0048] During the specific installation, such as Figure 3 As shown, the Z-axis direction of each mounting hole is first determined based on the Z-axis direction of the drill collar. Then, the X1 direction, perpendicular to the Z-axis, is determined based on the Z-axis direction of each mounting hole, thus establishing the X1-Z coordinate system for each mounting hole. During the specific welding process from the sensor substrate to the drill collar, the Y2 direction of the sensor module is first adjusted to coincide with the Z-axis direction of the mounting hole, and then the X2 direction of the sensor module is adjusted to coincide with the X1 direction of the mounting hole. Therefore, using modular sensor modules facilitates the installation of strain gauges. During installation, the coordinates of the sensor module are matched with the coordinates of each mounting hole to complete the installation of all strain gauges. Compared to installing each strain gauge individually, this avoids the tedious process of positioning and installing each strain gauge separately.

[0049] In one specific embodiment, each of the first strain gauge 20, each of the second strain gauge 30 and each of the third strain gauge 40 are connected to the sensor substrate by thin film sputtering, and the sensor substrate is made of the same material as the drill collar 10, and the sensor substrate is welded to the drill collar 10.

[0050] In the embodiment, the sensor substrate is made of the same material as the drill collar 10, and the sensor substrate is welded on the drill collar 10; the first strain gauges 20, the second strain gauges 30 and the third strain gauges 40 are connected on the sensor substrate by a thin film sputtering method, the thin film sputtering method is more convenient and has higher reliability than the high-temperature strain sensor pasting method, and is closer to the real deformation of the material and has high precision.

[0051] In an embodiment, as known from the foregoing, the first strain gauges 20 can be used to measure the torque received by the drill collar 10. Specifically, the torque measurement full-bridge circuit is used to measure the torque. The bridge connection mode of the torque measurement full-bridge circuit is as follows: one of the first strain gauges 20 in the first mounting hole 01 and the corresponding first strain gauge 20 in the second mounting hole 02 are connected in series to form a first bridge arm, and the other first strain gauge 20 in the first mounting hole 01 and the other first strain gauge 20 in the second mounting hole 02 are connected in series to form a second bridge arm; one of the first strain gauges 20 in the third mounting hole 03 and the corresponding first strain gauge 20 in the fourth mounting hole 04 are connected in series to form a third bridge arm, and the other first strain gauge 20 in the third mounting hole 03 and the other first strain gauge 20 in the fourth mounting hole 04 are connected in series to form a fourth bridge arm; the first bridge arm, the second bridge arm, the third bridge arm and the fourth bridge arm form a torque measurement full-bridge circuit, and the torque measurement full-bridge circuit is used to measure the torque of the drill collar 10.

[0052] The bridge connection mode of the embodiment can offset the effects of the drilling pressure, bending moment, temperature and drilling fluid on the torque measurement, and realize the decoupling of the coupling effect between the loads.

[0053] Specifically, in the torque measurement full-bridge circuit, under the action of the torque T, the torque strain and the output voltage have a linear relationship, so that the linear constant can be obtained through calibration, and the size of the torque strain can be measured according to the linear constant, the output voltage and the power supply, so that the size of the torque can be obtained.

[0054] In the torque measurement, the strain in the 45-degree direction is the maximum value. The 8 strain gauges are pasted in the 45-degree direction, two resistance strain gauges spaced 90 degrees apart are connected in series to form a bridge arm, 8 first strain gauges 20 are connected in the full-arm bridge working mode to increase the output signal and reduce the influence of temperature changes on the measurement results.

[0055] In an embodiment, the two second strain gauges 30 in the third mounting hole 03 form two bridge arms, the two second strain gauges 30 in the fourth mounting hole 04 form two bridge arms, and the four bridge arms form a first bending moment measurement full-bridge circuit, and the first bending moment measurement full-bridge circuit is used to measure the first bending moment.

[0056] In this embodiment, the positive and negative signs of the bending moment determine the shape of the bending deformation caused by the bending moment, and the downward bending in the bending plane is positive, and the upward bending is negative. In the first bending moment W Y Under the action of the bending moment, the strain values generated by the two strain gauges at 90 degrees on the circumference and the two strain gauges at 270 degrees on the circumference are equal in size and opposite in direction, wherein, as shown in Figure 1 , the intersection of the X-axis positive direction and the circumference of the drill collar 10 at 90 degrees on the circumference, and the intersection of the X-axis negative direction and the circumference of the drill collar 10 at 270 degrees on the circumference, the strain values generated by the two strain gauges at 90 degrees on the circumference are taken as ε WY , and the bending moment W Y Under the action of the bending moment, the output voltage U WY and the strain value are linearly related, and the linear coefficient between them can be obtained through calibration, and the size of the first bending moment can be obtained according to the measurement through the linear coefficient. According to the experimental stress analysis, this bridge mode can offset the influence of drilling pressure, torque, temperature and drilling fluid on the bending moment measurement, and realize the coupling effect between decoupled loads.

[0057] In an embodiment, two of the second strain gauges 30 in the first mounting hole 01 form two bridge arms, and two of the second strain gauges 30 in the second mounting hole 02 form two bridge arms, and four of the bridge arms form a second bending moment measurement full-bridge circuit, and the second bending moment measurement full-bridge circuit is used to measure the second bending moment.

[0058] In this embodiment, under the action of the second bending moment W X , when the bending moment acts on the measurement main shaft, the strain values generated by the two strain gauges at 0 degrees on the circumference and the two strain gauges at 180 degrees on the circumference are equal in size and opposite in direction. Wherein, as shown in Figure 1 , the intersection of the Y-axis negative direction and the circumference of the drill collar 10 at 0 degrees on the circumference, and the intersection of the Y-axis positive direction and the circumference of the drill collar 10 at 180 degrees on the circumference, the strain values generated by the two strain gauges at 0 degrees on the circumference are taken as ε WX , and the bending moment W X Under the action of the bending moment, the output voltage U WX and the strain value are linearly related, and the linear coefficient between them can be obtained through calibration, and the size of the second bending moment can be obtained according to the measurement through the linear coefficient. According to the experimental stress analysis, this bridge mode can offset the influence of drilling pressure, torque, temperature and drilling fluid on the bending moment measurement, and realize the coupling effect between decoupled loads.

[0059] Secondly, according to the bending moments W X and W Y in the X and Y directions, the bending moment W

[0060] In one embodiment, the transverse strain gauges of the third strain gauge 40 in the first mounting hole 01 and the third strain gauge 40 in the second mounting hole 02 are connected in series to form a first bridge arm; the transverse strain gauges of the third strain gauge 40 in the third mounting hole 03 and the third strain gauge 40 in the fourth mounting hole 04 are connected in series to form a second bridge arm opposite to the first bridge arm; another third strain gauge 40 in the first mounting hole 01 and another third strain gauge 40 in the second mounting hole 02 are connected in series to form a third bridge arm; another third strain gauge 40 in the third mounting hole 03 and another third strain gauge 40 in the fourth mounting hole 04 are connected in series to form a fourth bridge arm; the first bridge arm, the second bridge arm, the third bridge arm, and the fourth bridge arm constitute a full-bridge circuit for measuring drilling pressure, which is used to measure the drilling pressure.

[0061] In this embodiment, the use of an eight-strain gauge full-bridge connection increases signal output and facilitates measurement. In this connection, four transverse gauges form the first bridge arm and the second bridge arm opposite to it. These four transverse gauges provide temperature compensation, offsetting the effect of temperature on the third strain gauge 40. They also offset the effects of the first and second bending moments on the measurement. Similarly, under the action of drill pressure, the output voltage and strain of the full-bridge circuit for drill pressure measurement exhibit a linear relationship. Calibration can yield the linear coefficient between them, which, based on the measurement, allows the determination of the drill pressure magnitude. This bridge configuration effectively eliminates the influence of temperature, torque, bending moment, and pressure.

[0062] Example 2: Figure 4 As shown, the drill collar 10 is provided with a fifth mounting hole 05 and a sixth mounting hole 06 on its side wall. The fifth mounting hole 05 and the sixth mounting hole 06 are located in a third cross section perpendicular to the axis of the drill collar 10, and the angle between the axis of the fifth mounting hole 05 and the axis of the sixth mounting hole 06 is 180 degrees. The third cross section does not coincide with the first cross section, nor with the second cross section. The axis of the fifth mounting hole 05 is parallel to the axis of the first mounting hole 01. The sensor module is provided in both the fifth mounting hole 05 and the sixth mounting hole 06.

[0063] In this embodiment, the drill collar 10 is further provided with a fifth mounting hole 05 and a sixth mounting hole 06, and the axes of the fifth mounting hole 05 and the sixth mounting hole 06 coincide. The axis of the fifth mounting hole 05 is parallel to the axis of the first mounting hole 01. With the addition of the fifth mounting hole 05 and the sixth mounting hole 06, plus the aforementioned four mounting holes, the drill collar 10 has a total of six mounting holes, arranged in three rows. Each mounting hole is provided with the sensor module described in Embodiment 1. The sensor modules in the six mounting holes are used for bridging and measuring the aforementioned forces.

[0064] Based on Embodiment 2, in this embodiment, the transverse strain gauge 40 in the third mounting hole 03 and the transverse strain gauge 40 in the fourth mounting hole 04 are connected in series to form a first bridge arm; the transverse strain gauge 40 in the fifth mounting hole 05 and the transverse strain gauge 40 in the sixth mounting hole 06 are connected in series to form a second bridge arm corresponding to the first bridge arm; the other third strain gauge 40 in the third mounting hole 03 and the other third strain gauge 40 in the fourth mounting hole 04 are connected in series to form a third bridge arm; the other third strain gauge 40 in the fifth mounting hole 05 and the other third strain gauge 40 in the sixth mounting hole 06 are connected in series to form a fourth bridge arm; the first bridge arm, the second bridge arm, the third bridge arm and the fourth bridge arm form a full-bridge circuit for measuring drilling pressure, which is used to measure the drilling pressure received by the drill collar 10.

[0065] In this embodiment, due to the presence of the fifth mounting hole 05 and the sixth mounting hole 06, the strain gauge assembly method of the sensor module is different. Specifically, the drilling pressure is measured by bridging the strain gauges in the third mounting hole 03, the fourth mounting hole 04, the fifth mounting hole 05 and the sixth mounting hole 06, and the bridging method is the same, with four transverse gauges connected to two opposite bridge arms.

[0066] Based on Embodiment 2, in this embodiment, the vertical strain gauges in the second strain gauge 30 in the first mounting hole 01, the vertical strain gauges in the second strain gauge 30 in the second mounting hole 02, the vertical strain gauges in the second strain gauge 30 in the fifth mounting hole 05, and the vertical strain gauges in the second strain gauge 30 in the sixth mounting hole 06 each form a bridge arm. The four bridge arms form a second bending moment measurement full-bridge circuit, which is used to measure the second bending moment.

[0067] In this embodiment, due to the presence of the fifth mounting hole 05 and the sixth mounting hole 06, the strain gauges used to measure the second bending moment are arranged in a different way. Specifically, the second bending moment is measured by a bridge of strain gauges in the first mounting hole 01, the second mounting hole 02, the fifth mounting hole 05 and the sixth mounting hole 06.

[0068] The first mounting hole 01, the second mounting hole 02, the third mounting hole 03, the fourth mounting hole 04, the fifth mounting hole 05 and the sixth mounting hole 06 of the above-mentioned embodiments of the application are all circular holes. And through the simulation analysis of the structure of the two arrangement modes of three rows of six holes and two rows of four holes of the embodiments of the application, and using the numerical simulation method, the correctness of the load identification strategy is tested respectively, and the results show that the above-mentioned two arrangement modes meet the functional requirements, and the arrangement mode of three rows of six holes has higher precision than the arrangement mode of two rows of four holes, and the mechanical structure can be designed according to the actual requirements during design.

[0069] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the present application should be understood as the general meanings understood by the skilled person in the field to which the present application belongs.

[0070] In addition, the terms "one", "two" and the like are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implying the number of the technical features indicated. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0071] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0072] Finally, it should be pointed out that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered in the scope of the claims and the description of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A system for stress testing while drilling, characterized by, The first mounting hole (01), the second mounting hole (02), the third mounting hole (03) and the fourth mounting hole (04) are arranged on the sidewall of the drill collar (10), wherein: The first mounting hole (01) and the second mounting hole (02) are located in a first cross section perpendicular to the axis direction of the drill collar (10), and the included angle between the axis of the first mounting hole (01) and the axis of the second mounting hole (02) is 180 degrees; The third mounting hole (03) and the fourth mounting hole (04) are located in a second cross section perpendicular to the axis direction of the drill collar (10), the first cross section and the second cross section do not coincide, and the included angle between the axis of the third mounting hole (03) and the axis of the fourth mounting hole (04) is 180 degrees, and the included angle between the axis of the first mounting hole (01) and the axis of the third mounting hole (03) is 90 degrees; A sensor module is arranged in each of the first mounting hole (01), the second mounting hole (02), the third mounting hole (03) and the fourth mounting hole (04), and the sensor module is used to measure the torque received by the drill collar (10), the first bending moment around the axis direction of the first mounting hole (01), the second bending moment around the axis direction of the third mounting hole (03), and the drilling pressure received by the drill collar (10). Each sensor module comprises a sensor substrate, two first strain gauges (20), two second strain gauges (30) and two third strain gauges (40), wherein: each first strain gauge (20) is connected to the corresponding sensor substrate in a 45-degree direction patch manner, the patch directions of the two first strain gauges (20) on the same sensor substrate are perpendicular to each other, and the first strain gauges (20) are connected to form a bridge to measure the torque received by the drill collar (10); Among the two second strain gauges (30) on the same sensor substrate, one second strain gauge (30) is a transverse patch perpendicular to the axis direction of the drill collar (10), and the other second strain gauge (30) is a vertical patch parallel to the axis direction of the drill collar (10), and the second strain gauges (30) are connected to form a bridge to measure the first bending moment and to form a bridge to measure the second bending moment; Among the two third strain gauges (40) on the same sensor substrate, one third strain gauge (40) is a transverse patch perpendicular to the axis direction of the drill collar (10), and the other third strain gauge (40) is a vertical patch parallel to the axis direction of the drill collar (10), and the third strain gauges (40) are connected to form a bridge to measure the drilling pressure received by the drill collar (10).

2. The system of claim 1, wherein, Each first strain gauge (20), each second strain gauge (30) and each third strain gauge (40) are connected to the sensor substrate by a thin film sputtering method, and the sensor substrate is made of the same material as the drill collar (10), and the sensor substrate is welded to the drill collar (10).

3. The system of claim 1, wherein, One of the first strain gauges (20) in the first mounting hole (01) and the corresponding first strain gauge (20) in the second mounting hole (02) are connected in series to form a first bridge arm, and the other first strain gauge (20) in the first mounting hole (01) and the other first strain gauge (20) in the second mounting hole (02) are connected in series to form a second bridge arm; One of the first strain gauges (20) in the third mounting hole (03) and the corresponding first strain gauge (20) in the fourth mounting hole (04) are connected in series to form a third bridge arm, and the other first strain gauge (20) in the third mounting hole (03) and the other first strain gauge (20) in the fourth mounting hole (04) are connected in series to form a fourth bridge arm; The first bridge arm, the second bridge arm, the third bridge arm and the fourth bridge arm form a torque measurement full-bridge circuit, and the torque measurement full-bridge circuit is used to measure the torque.

4. The system of claim 1, wherein, Two second strain gauges (30) in the third mounting hole (03) form two bridge arms, and two second strain gauges (30) in the fourth mounting hole (04) form two bridge arms, and four bridge arms form a first bending moment measurement full-bridge circuit, and the first bending moment measurement full-bridge circuit is used to measure the first bending moment.

5. The system of claim 1, wherein, Two second strain gauges (30) in the first mounting hole (01) form two bridge arms, and two second strain gauges (30) in the second mounting hole (02) form two bridge arms, and four bridge arms form a second bending moment measurement full-bridge circuit, and the second bending moment measurement full-bridge circuit is used to measure the second bending moment.

6. The system of claim 1, wherein, The transverse piece in the third strain gauge (40) in the first mounting hole (01) and the transverse piece in the third strain gauge (40) in the second mounting hole (02) are connected in series to form a first bridge arm, and the transverse piece in the third strain gauge (40) in the third mounting hole (03) and the transverse piece in the third strain gauge (40) in the fourth mounting hole (04) are connected in series to form a second bridge arm opposite to the first bridge arm; The other third strain gauge (40) in the first mounting hole (01) and the other third strain gauge (40) in the second mounting hole (02) are connected in series to form a third bridge arm; The other third strain gauge (40) in the third mounting hole (03) and the other third strain gauge (40) in the fourth mounting hole (04) are connected in series to form a fourth bridge arm; The first bridge arm, the second bridge arm, the third bridge arm and the fourth bridge arm form a drilling pressure measurement full-bridge circuit, and the drilling pressure measurement full-bridge circuit is used to measure the drilling pressure.

7. The system of claim 1, wherein, The fifth mounting hole (05) and the sixth mounting hole (06) are located in a third cross section perpendicular to the axis direction of the drill collar (10), and the included angle between the axis of the fifth mounting hole (05) and the axis of the sixth mounting hole (06) is 180 degrees, the third cross section does not coincide with the first cross section, and the third cross section does not coincide with the second cross section. The axis of the fifth mounting hole (05) and the axis of the first mounting hole (01) are parallel to each other. The fifth mounting hole (05) and the sixth mounting hole (06) are provided with the sensor module.

8. The system of claim 7, wherein, The transverse pieces in the third strain gauges (40) in the third mounting hole (03) and the transverse pieces in the third strain gauges (40) in the fourth mounting hole (04) are connected in series to form a first bridge arm, and the transverse pieces in the third strain gauges (40) in the fifth mounting hole (05) and the transverse pieces in the third strain gauges (40) in the sixth mounting hole (06) are connected in series to form a second bridge arm corresponding to the first bridge arm. Another third strain gauge (40) in the third mounting hole (03) and another third strain gauge (40) in the fourth mounting hole (04) are connected in series to form a third bridge arm. Another third strain gauge (40) in the fifth mounting hole (05) and another third strain gauge (40) in the sixth mounting hole (06) are connected in series to form a fourth bridge arm. The first bridge arm, the second bridge arm, the third bridge arm and the fourth bridge arm form a full-bridge circuit for measuring the drilling pressure.

9. The system of claim 7, wherein, The vertical pieces in the second strain gauges (30) in the first mounting hole (01), the vertical pieces in the second strain gauges (30) in the second mounting hole (02), the vertical pieces in the second strain gauges (30) in the fifth mounting hole (05) and the vertical pieces in the second strain gauges (30) in the sixth mounting hole (06) respectively form a bridge arm, and four bridge arms form a full-bridge circuit for measuring the second bending moment.

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