Micro electro mechanical system addition meter capable of adjusting coaxiality

Abstract

The utility model discloses a micro electro mechanical system (MEMS) accelerometer capable of adjusting coaxiality, which is used for a while-drilling (MWD) directional sensor, and is characterized by comprising an accelerometer shell, a plurality of jackscrew mounting holes are formed in an end cover part of the accelerometer shell in a penetrating manner, and a plurality of jackscrew mounting holes are formed in the end cover part of the accelerometer shell; adjusting jackscrews coaxially corresponding to different sectors for adjusting the measurement direction of the micro-electro-mechanical system accelerometer are arranged in the jackscrew mounting holes. A micro-electro-mechanical system acceleration module is installed in an inner cavity of the accelerometer shell through a module positioning ring and a module supporting ring on the two sides, and a micro-electro-mechanical system acceleration chip used for measuring acceleration is installed in the micro-electro-mechanical system acceleration module. The other side of the module supporting ring is provided with a wave spring used for providing rebound force when the coaxiality is adjusted. And the tail end of the wave spring is provided with a meter adding cover which is matched with the meter adding shell for installation.

Description

Technical Field

[0001] This utility model relates to the field of orientation instruments in drilling measurement, and particularly to a microelectromechanical system (MEMS) gauge with adjustable coaxiality. Background Technology

[0002] Microelectromechanical systems (MEMS) accelerometer chips are small, highly accurate, and low-cost. When used in directional sensors for measurement while drilling, these chips provide acceleration values ​​along the X, Y, and Z axes to calculate wellbore inclination, tool face, and azimuth. In practical applications, the coaxiality of the X, Y, and Z axis gauges rotating around their own axes determines the basic accuracy of the directional sensor. Combined with parameters such as the mechanical angle difference calculated after calibration, the accurate wellbore inclination at a specific temperature point can be determined.

[0003] In the calibration coefficients of a orientation sensor, the mechanical angle difference value is fixed. However, the misalignment of the gauge makes the mechanical angle difference value no longer fixed, causing a deviation in the mechanical angle difference obtained after the orientation sensor is calibrated. This deviation in the mechanical angle difference leads to deviations in the calculated well inclination, tool face, and azimuth values. Therefore, to improve the measurement accuracy of the orientation sensor, it is necessary to improve the coaxiality index of the gauge itself. Utility Model Content

[0004] The purpose of this invention is to achieve high-precision measurement of orientation sensors in drilling measurement using a low-cost MEMS gauge. A secondary encapsulation is performed on the existing MEMS gauge chip, which cannot adjust coaxiality, thus achieving adjustable coaxiality. This MEMS gauge structure, combined with a simple coaxiality adjustment fixture, achieves high-coaxiality MEMS gauge application.

[0005] To achieve the aforementioned objectives, this utility model provides an adjustable coaxiality microelectromechanical system (MEMS) gauge, comprising:

[0006] A measuring instrument housing has several set screw mounting holes through the end cap of the measuring instrument housing. Adjusting set screws corresponding to the sectors of different adjustment microelectromechanical systems measuring directions are provided in the set screw mounting holes.

[0007] A microelectromechanical system (MEMS) accelerometer module is installed in the internal cavity of the accelerometer housing via module positioning rings and module support rings on both sides. The MEMS accelerometer module contains a MEMS accelerometer chip for measuring acceleration.

[0008] A wave spring is provided on the other side of the module support ring to provide a rebound force when adjusting coaxiality;

[0009] An accelerator cover is provided at the end of the wave spring to cooperate with the accelerator housing.

[0010] In a preferred embodiment of this utility model, the adjusting set screw is

[0011] The first adjusting screw is coaxial with the first sector that adjusts the measurement direction of the microelectromechanical system.

[0012] The second adjusting screw is coaxial with the second sector that adjusts the measurement direction of the microelectromechanical system.

[0013] The third adjusting screw is coaxial with the third sector corresponding to the direction of the meter measurement of the microelectromechanical system;

[0014] The fourth adjusting screw is coaxial with the fourth sector that adjusts the direction of the microelectromechanical system's meter measurement.

[0015] In a preferred embodiment of this utility model, the module positioning ring is used for one-sided support and positioning during the installation of the microelectromechanical system acceleration module.

[0016] In a preferred embodiment of this utility model, the module support ring is used for support on the other side during the installation of the microelectromechanical system acceleration module.

[0017] In a preferred embodiment of this utility model, the gauge cover is used to fix the internal structure of the gauge and is installed in conjunction with the gauge housing through a cold pressing process.

[0018] Compared with existing direct fixing installation methods, the advantages of this utility model are as follows:

[0019] This invention provides an adjustable coaxiality microelectromechanical system (MEMS) gauge applied to a drilling MWD orientation sensor, which improves the measurement accuracy of the MWD orientation sensor while reducing its production cost. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a microelectromechanical system with adjustable coaxiality according to the present invention.

[0021] Figure 2 This is a schematic diagram of the sector surface for adjusting the set screw of this utility model.

[0022] Figure 3 This is a schematic diagram of the structure of the microelectromechanical system with added gauges, which is adjusted using a simple coaxiality adjustment tool according to this utility model. Detailed Implementation

[0023] To make this utility model more apparent and understandable, the present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0024] like Figure 1 The adjustable coaxiality microelectromechanical system (MEMS) measuring instrument shown includes a measuring instrument housing 5. A plurality of set screw mounting holes 51 are provided through the end cap of the measuring instrument housing 5. Adjusting set screws corresponding to the sectors of different adjustable MEMS measuring directions are provided in the set screw mounting holes 51. Specifically, the first adjusting set screw 1 corresponds to the first sector 100 of the adjustable MEMS measuring direction.

[0025] The second adjusting screw 2 is coaxial with the second sector 200 of the microelectromechanical system (MEMS) measuring direction. The third adjusting screw 3 is coaxial with the third sector 300 of the MEMS measuring direction. The fourth adjusting screw 4 is coaxial with the fourth sector 400 of the MEMS measuring direction.

[0026] The microelectromechanical system acceleration module 7 is installed in the internal cavity of the accelerator housing 5 via module positioning rings 6 and module support rings 8 on both sides. Specifically, the module positioning rings 6 are used for one-sided support and positioning of the microelectromechanical system acceleration module 7 during installation.

[0027] The module support ring 8 is used for support on the other side when installing the microelectromechanical system acceleration module 7.

[0028] The microelectromechanical system acceleration module 7 contains a microelectromechanical system acceleration chip 71 for measuring acceleration.

[0029] A wave spring 9 is provided on the other side of the module support ring 8 to provide a rebound force when adjusting the coaxiality;

[0030] An accelerator cover 10 is provided at the end of the wave spring 9, which is installed in conjunction with the accelerator housing 5.

[0031] The gauge cover 10 is used to fix the internal structure of the gauge and is installed in conjunction with the gauge housing through a cold pressing process.

[0032] Thanks to the above technical solution, this utility model can adjust the coaxiality of the microelectromechanical system gauge after being installed on a simple coaxiality adjustment fixture.

[0033] When adjusting coaxiality, place the simple coaxiality adjustment fixture on a horizontal table. Rotate the fixture to 0°, 45°, 90°, 135°, 180°, 225°, 270°, and 315° respectively, and record the output value of the microelectromechanical system (MEMS) gauge. Based on the calculated average acceleration, repeatedly adjust the first adjusting screw 1, the second adjusting screw 2, the third adjusting screw 3, and the fourth adjusting screw 4 until the coaxiality fixture rotates one full revolution and the output value of the MEMS gauge is the same.

[0034] like Figure 2The first adjusting screw 1, the second adjusting screw 2, the third adjusting screw 3, and the fourth adjusting screw 4 shown act on four sectors respectively. When adjusting the coaxiality of the microelectromechanical system (MEMS) meter, the corresponding adjusting screws are adjusted according to the obtained output value of the MEMS meter.

[0035] like Figure 3 The microelectromechanical system (MEMS) gauge shown is installed on a simple coaxiality adjustment fixture for adjustment. The MEMS gauge is fixed on the adjusting rod 500, and the adjusting rod is placed on the V-groove 600.

[0036] The first adjusting screw 1 is aligned with the tooling reference line 501. The tooling reference line 501 is rotated and adjusted to 0°. The output data value of the microelectromechanical system is recorded.

[0037] Rotate the tooling baseline 501 to 45° and record the output data value of the microelectromechanical system (MEMS) meter. Continue rotating the tooling baseline to 315° and recording all the output data values ​​of the MEMS meter. Find the maximum and minimum values ​​of the output values ​​and calculate the target value. Target value = maximum value - (maximum value - minimum value) / 2.

[0038] The details are shown in Table 1 below.

[0039] Table 1

[0040]

[0041] After calculating the target value, rotate and adjust the reference line of the tooling equipped with the microelectromechanical system (MEMS) gauge to 0°, 90°, 180°, and 270°. Adjust the first adjusting screw 1, the second adjusting screw 2, the third adjusting screw 3, and the fourth adjusting screw 4 so that the output value of the MEMS gauge signal is equal to the target value.

[0042] Although the present invention has been described in detail through the above embodiments, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above content. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A microelectromechanical system (MEMS) gauge with adjustable coaxiality, characterized in that, include: A measuring instrument housing has several set screw mounting holes through the end cap of the measuring instrument housing. Adjusting set screws corresponding to the sectors of different adjustment microelectromechanical systems measuring directions are provided in the set screw mounting holes. A microelectromechanical system (MEMS) accelerometer module is installed in the internal cavity of the accelerometer housing via module positioning rings and module support rings on both sides. The MEMS accelerometer module contains a MEMS accelerometer chip for measuring acceleration. A wave spring is provided on the other side of the module support ring to provide a rebound force when adjusting the coaxiality; An accelerator cover is provided at the end of the wave spring to cooperate with the accelerator housing.

2. The adjustable coaxiality microelectromechanical system (MEMS) gauge as described in claim 1, characterized in that, The adjusting set screw is The first adjusting screw is coaxial with the first sector that adjusts the measurement direction of the microelectromechanical system. The second adjusting screw is coaxial with the second sector that adjusts the measurement direction of the microelectromechanical system. The third adjusting screw is coaxial with the third sector corresponding to the direction of the meter measurement of the microelectromechanical system; The fourth adjusting screw is coaxial with the fourth sector that adjusts the direction of the microelectromechanical system's meter measurement.

3. The adjustable coaxiality microelectromechanical system (MEMS) gauge as described in claim 1, characterized in that, The module positioning ring is used for one-sided support and positioning during the installation of the microelectromechanical system acceleration module.

4. The adjustable coaxiality microelectromechanical system (MEMS) gauge as described in claim 1, characterized in that, The module support ring is used for support on the other side during the installation of the microelectromechanical system acceleration module.

5. The adjustable coaxiality microelectromechanical system (MEMS) gauge as described in claim 1, characterized in that, The gauge cover is used to fix the internal structure of the gauge and is installed in conjunction with the gauge housing through a cold pressing process.

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