Well deviation measuring device and method suitable for strong vibration environment

Abstract

The invention belongs to the technical field of exploration, development and measurement, and particularly relates to a well deviation measuring device and method suitable for a strong vibration environment, and the well deviation measuring device mainly comprises a hollow cylindrical compression-resistant cylinder, a circuit framework, an acceleration measuring module and a main control module. The whole circuit framework is of a cylindrical structure and is arranged in the hollow cylindrical compression-resistant cylinder, and the side face of the circuit framework is hollowed out and provided with a layout plane. The acceleration measurement module and the main control module are fixedly installed on the layout plane of the circuit framework, and the acceleration measurement module is electrically connected with the main control module through a conductive cable. According to the technical scheme, the acceleration measurement module and the main control module are separately designed, different characteristics and working requirements of the acceleration measurement module and the main control module in a strong vibration environment are fully considered, and the method plays an important role in improving the overall anti-seismic performance and maintainability of the well deviation measurement device.

Description

Technical Field

[0001] The invention belongs to the technical field of exploration and development measurement, and in particular relates to a well deviation measurement device and method suitable for a strong vibration environment. Background Art

[0002] Accurate and reliable inclination measurement while drilling data is crucial to drilling operations. It is the basis for ensuring the quality of drilling trajectory control, safely and efficiently drilling to geological targets, and improving single well production and oil and gas reservoir recovery. With the development of drilling technology and the demand for rapid production of oil and gas fields, in order to increase the drilling speed of drilling machinery, when drilling in formations with poor drillability and interlaced soft and hard formations widely distributed in Sichuan, Chongqing, Xinjiang and other regions, aggressive drilling parameters such as high drilling pressure and high drilling speed are widely used, resulting in continuous vibration downhole up to 20g (g is the acceleration of gravity, g=9.81m / s²) and above, and instantaneous impact vibration up to 200g and above.

[0003] However, the electronic components of the inclination measurement module have limited anti-vibration capabilities. In such a strong downhole vibration environment, the module faces many problems, such as increased measurement errors, reduced stability, shortened life, and even rapid failure and damage. These problems lead to frequent trips and drilling, which seriously affect the drilling time and drilling cycle.

[0004] In order to reduce the vibration level of the electronic circuit of the downhole inclination measurement module while drilling, extend the module life and reduce the failure rate, the industry usually adopts the following three main methods: First, 4-6 vibration-damping rubber gaskets are installed at the connection between the electronic circuit module of the well inclination measurement and the circuit frame screw. However, since the conventional well inclination measurement module needs to continuously measure in real time during drilling and ensure the inclination measurement accuracy, its vibration displacement needs to be strictly controlled, which limits the overall vibration reduction ability of this method.

[0005] The second is to add damping or energy absorption and vibration reduction tools to the drilling tool assembly. However, such tools have poor adaptability and have their own failure risks.

[0006] Third, optimize the drilling tool assembly and monitor the downhole vibration during drilling. When the vibration exceeds the standard, adjust the drilling parameters to reduce the downhole vibration. However, due to the limitation of the downhole data transmission rate, there is a lag of 3-10 minutes, and the adjustment of drilling parameters often requires multiple attempts to achieve the vibration reduction effect, which further prolongs the duration of the downhole measurement circuit module to withstand strong vibration.

[0007] In current field applications, the actual vibration resistance of the well deviation measurement module under the above method is less than 10g, and the measurement data distortion and failure problems caused by strong vibrations underground are still very prominent, and urgently need to be improved. Summary of the invention

[0008] The purpose of the present invention is to solve the problem that the well inclination measurement module of the inclination measurement while drilling tool is prone to failure in a strong vibration environment underground, and to propose a well inclination measurement device and method suitable for a strong vibration environment. Through technical and method innovation, the vibration resistance of the well inclination measurement module is greatly improved, which is of great significance for reducing the well failure rate, ensuring the quality of the wellbore trajectory and improving the drilling efficiency.

[0009] To achieve the above object, the present invention adopts the following technical solutions: A well inclination measurement device for a strong vibration environment comprises a hollow cylindrical compression tube, a circuit skeleton, an acceleration measurement module and a main control module; the circuit skeleton is in an overall cylindrical structure and is arranged in the hollow cylindrical compression tube, and a layout plane is hollowed out on its side; the acceleration measurement module is fixedly mounted on the layout plane of the circuit skeleton and is used to detect acceleration data at its location; the main control module is fixedly mounted on the layout plane of the circuit skeleton and is electrically connected to the acceleration measurement module through a conductive cable, and is used to control the operation and power supply of the acceleration measurement module, receive and process acceleration data, and upload the well inclination data after obtaining it; the acceleration data is the gravity acceleration components of the three axes of X, Y and Z.

[0010] Preferably, the acceleration measurement module includes a PCB board I and an accelerometer; the PCB board I is fixed to the layout plane of the circuit skeleton by fastening screws, and a vibration-damping silicone layer is arranged between the PCB board I and the circuit skeleton; the accelerometer is fixedly mounted on the PCB board I.

[0011] Preferably, the thickness of the vibration-damping silicone layer is 0.2-0.6 mm.

[0012] Preferably, a fixed frame is provided on the PCB board I, and the accelerometer is potted in the fixed frame by silicone.

[0013] Preferably, the silica gel filling thickness in the fixed frame is 2-5 mm.

[0014] Preferably, the accelerometer is a MEMS accelerometer based on capacitance effect.

[0015] Preferably, the main control module includes a PCB board II and a main control circuit, and the main control circuit is arranged on the PCB board II; the PCB board II is fixed to the layout plane of the circuit skeleton by a plurality of screw assemblies, and a vibration-damping rubber gasket is arranged between the PCB board I and the circuit skeleton.

[0016] Preferably, all screw assemblies are arranged in parallel and at intervals along the length direction of PCB board II, and the interval between adjacent screw assemblies is 40 to 60 mm.

[0017] Preferably, the screw assembly includes a compacted vibration-damping gasket and at least two screw bodies. The screw bodies pass through the compacted vibration-damping gasket, PCB board II and the vibration-damping rubber gasket in sequence and are then fastened to the circuit skeleton.

[0018] Preferably, the thickness of the vibration-damping gasket and the vibration-damping rubber gasket are both 2-3 mm.

[0019] Preferably, the PCB board II includes 4 to 6 stacked wiring layers, and the glass fiber reinforced polypropylene material is tightly bonded between adjacent wiring board layers.

[0020] Preferably, the glass fiber reinforced polypropylene material consists of 2 to 3 layers of glass fiber cloth and 50% to 70% by volume of polypropylene resin.

[0021] Preferably, a plurality of radial vibration-damping structures are arranged on the circuit skeleton at intervals along the axial direction; each radial vibration-damping structure comprises a vibration-damping sealing ring, and PEK annular retaining rings are respectively arranged on both axial sides of the vibration-damping sealing ring.

[0022] Preferably, axial vibration-damping rubber blocks are respectively embedded at both ends of the circuit skeleton.

[0023] Preferably, let the length of the conductive cable be N, let the contact distance between the acceleration measurement module and the main control module be M, then 1.1M≤N≤1.5M.

[0024] A method for measuring well deviation in a strong vibration environment comprises the following steps: S1, selecting an acceleration measurement module with a suitable range, and participating in assembling the above-mentioned well inclination measurement device for a strong vibration environment; S2, installing the well inclination measuring device on the drilling tool and lowering it into the well together with the drilling tool; S3, when measuring the well inclination, the main control module in the well inclination measuring device controls the acceleration measuring module to collect acceleration data at the location; the acceleration data is the gravity acceleration components of the three axes X, Y, and Z at the location of the well inclination measuring device; S4, the main control module decodes and settles the acceleration data to obtain the well deviation data; S5, uploading the well inclination data to the ground receiving equipment through the upper transmission device.

[0025] Preferably, in step S2, the installation position of the well inclination measuring device is 1.2-1.8 m away from the drill bit.

[0026] Preferably, in step S4, decoding and settling the acceleration data includes: obtaining 50 to 200 sets of gravity acceleration component data of the three axes X, Y, and Z respectively; subjecting all gravity acceleration component data to normal distribution in units of axes; and taking the average value of the data with a distribution frequency interval of 50% for calculating the well deviation data.

[0027] Beneficial effects of the present invention: 1) The well inclination measurement device for strong vibration environment in this technical solution forms a relatively complete and stable structure by setting the circuit skeleton in the hollow cylindrical pressure-resistant tube and reasonably arranging and installing the acceleration measurement module and the main control module. This structure can effectively resist the impact of strong vibration on the measurement device in the well. Compared with the existing methods in the background technology, it can better ensure the accurate measurement of the X, Y, and Z three-axis gravity acceleration components in a high vibration environment and the acquisition and uploading of subsequent well inclination data, providing a more reliable data basis for accurately controlling the wellbore trajectory and improving drilling efficiency, etc., and greatly improving the overall adaptability and reliability of the well inclination measurement module in a strong vibration environment.

[0028] 2) The acceleration measurement module is connected to the circuit skeleton through PCB board I, and a vibration-damping silicone layer is provided. This design not only enables the acceleration measurement module to be stably installed when connected to the circuit skeleton, but also effectively absorbs and disperses the vibration energy transmitted from the circuit skeleton with the help of the vibration-damping silicone layer, reducing the impact of vibration on the acceleration measurement module. Compared with the conventional vibration reduction method in the background technology, it can more accurately detect the acceleration data at the location, thereby improving the accuracy of well inclination measurement and extending the service life of the module.

[0029] 3) The thickness of the vibration-damping silicone layer is specified to be 0.2-0.6mm, and this thickness range is carefully considered. Without occupying too much space, it can ensure that the silicone layer has enough material to absorb and disperse the energy generated by the downhole vibration, effectively buffer vibrations of different frequencies and amplitudes, and avoid the stability problem of PCB board I that may be caused by the excessive thickness of the silicone layer. Compared with some vibration reduction measures in the background technology that have limited vibration reduction capabilities due to overall design limitations, the setting of this thickness range further optimizes the vibration reduction performance of the acceleration measurement module and improves its working stability and measurement accuracy in a strong vibration environment.

[0030] 4) A fixed frame is set on PCB board I and the accelerometer is potted in it with silicone. The fixed frame provides stable physical support and positioning for the accelerometer, ensuring its accurate placement on PCB board I to avoid displacement or shaking caused by factors such as vibration. Silicone potting further enhances the vibration reduction effect of the accelerometer, while providing sealing protection to prevent the intrusion of external impurities and strengthening electrical insulation. Compared with the existing methods in the background technology, it more comprehensively guarantees the stable operation of the accelerometer in a strong vibration environment, effectively improves its measurement performance, reliability and service life, and thus improves the performance of the entire well inclination measurement device.

[0031] 5) The thickness of the silicone filling in the fixed frame is 2-5mm, and this thickness range can provide more significant vibration reduction, sealing and electrical insulation effects. Compared with the conventional vibration reduction methods in the background technology, it can better cope with the complex strong vibration environment underground, more effectively absorb and disperse the impact of strong vibration on the accelerometer, more strictly block external impurities such as water vapor and dust, and more strongly isolate electrical interference, thereby ensuring that the accelerometer works in a relatively stable, clean, dry and well-insulated environment, laying a solid foundation for accurately measuring acceleration data and improving the adaptability and reliability of the well inclination measurement device in harsh environments.

[0032] 6) The use of MEMS accelerometers based on the capacitive effect has the advantages of light weight, small size, and vibration resistance up to 20g, which is far superior to the limited vibration resistance of the electronic components of the well inclination measurement module mentioned in the background technology. Its light weight makes the inertia small under strong vibration, and the stress impact on the welding pins is small, which greatly reduces the risk of poor contact and breakage due to loose pins. It can work more stably in the strong vibration environment underground, accurately measure acceleration data, and provide a more reliable acceleration measurement method for the well inclination measurement device, improving the stability and measurement accuracy of the entire device in a strong vibration environment.

[0033] 7) The main control module is connected to the circuit skeleton through PCB board II, and a vibration-damping rubber gasket is provided. This design can effectively absorb and disperse the vibration energy transmitted from the circuit skeleton, reducing the impact of vibration on the main control module. Compared with some methods in the background technology, such as only adding a limited number of vibration-damping rubber gaskets to the screw connection between the well inclination measurement electronic circuit module and the circuit skeleton and the vibration-damping capacity is limited, this technical solution can more comprehensively guarantee the stable operation of the main control module in a strong vibration environment, ensure its control of the acceleration measurement module, data processing, well inclination data upload and other functions are normally executed, and improve the reliability and stability of the entire well inclination measurement device.

[0034] 8) The screw components are arranged in parallel and spaced apart along the length direction of PCB board II, and the adjacent intervals are between 40-60mm. This arrangement can make PCB board II receive uniform fixing force in the length direction, avoid deformation of PCB board II due to concentrated fixing force, and also facilitate installation and operation. Compared with some situations in the background technology that may affect the stability of the module due to unreasonable installation methods, this design ensures the stable installation of PCB board II on the circuit skeleton, guarantees the stability of the main control module, and thus improves the reliability and maintainability of the entire well inclination measurement device in a strong vibration environment.

[0035] 9) The screw assembly includes a compacted vibration-damping gasket and at least two screw bodies. The compacted vibration-damping gasket can further enhance the vibration-damping effect and protect the surface of PCB board II, while at least two screw bodies can provide a more stable connection and evenly disperse the pressure. Compared with the conventional screw connection method in the background technology, this design comprehensively considers multiple factors such as vibration reduction, connection stability, and protection of PCB board II, effectively improving the stability, reliability, and maintainability of the main control module in a strong vibration environment, and better adapting to the working environment of strong vibration underground.

[0036] 10) The thickness of the vibration-damping gasket and the vibration-damping rubber gasket are both 2-3mm. This thickness range ensures that the vibration-damping function can be exerted without occupying too much internal space of the device, and can cooperate well with other components. Compared with the situation in the background technology that some vibration-damping measures may affect the overall performance due to inappropriate gasket thickness, the setting of this thickness range optimizes the vibration-damping effect, improves the stability and durability of the main control module in a strong vibration environment, and ensures the normal operation of the entire well inclination measurement device.

[0037] 11) PCB board II includes 4-6 stacked wiring layers and the adjacent wiring board layers are tightly bonded with glass fiber reinforced polypropylene material. This multi-layer wiring layer design can improve the circuit's anti-interference ability and stability, effectively deal with possible electromagnetic interference underground, and ensure the normal operation of the main control circuit. Compared with some situations in the background technology where the accuracy of the measurement data is affected due to insufficient circuit anti-interference ability, this technical solution optimizes the structure of PCB board II to better ensure the stable operation of the main control module in a strong vibration environment, and improve the measurement accuracy and reliability of the entire well inclination measurement device.

[0038] 12) The glass fiber reinforced polypropylene material is composed of 2-3 layers of glass fiber cloth and 50%-70% polypropylene resin by volume. This material composition can effectively reduce the stress on the connection points between the circuit board layers when the circuit board is bent under strong vibration. Compared with the situation in the background technology that the connection points between the layers may be susceptible to stress due to unreasonable circuit board structure design, this technical solution ensures the structural integrity of PCB board II in a strong vibration environment through reasonable selection of materials, ensures the stability of the electrical connection of the main control circuit, and improves the stability and reliability of the entire well inclination measurement device.

[0039] 13) Several radial vibration-damping structures are arranged at intervals along the axial direction on the circuit skeleton, and each radial vibration-damping structure includes a vibration-damping sealing ring and PEK annular retaining rings on both sides of the axial direction. This design can comprehensively reduce vibration and protect the circuit skeleton. The vibration-damping sealing ring can absorb and disperse vibration energy, and the PEK annular retaining ring can limit its excessive deformation and protect it from external damage. Compared with the situation in the background technology that some vibration-damping measures may have poor vibration-damping effects due to limited coverage or incomplete protection, this technical solution improves the vibration resistance of the circuit skeleton in a strong vibration environment by setting up a complete radial vibration-damping structure, ensures the normal operation of the electronic components installed thereon, and thereby improves the stability and reliability of the entire well inclination measurement device.

[0040] 14) Axial vibration-damping rubber blocks are embedded at both ends of the circuit skeleton, which mainly reduce the vibration of the circuit skeleton in the axial direction. Working in conjunction with the radial vibration-damping structure, it can fully cope with the complex vibration conditions underground. Compared with some background technologies that may only focus on vibration reduction in a single direction and ignore other directions, this technical solution improves the vibration resistance of the circuit skeleton in a strong vibration environment by setting an axial vibration-damping rubber block in conjunction with the radial vibration-damping structure, ensuring the normal operation of the entire well inclination measurement device in a strong vibration environment, and improving its stability and reliability.

[0041] 15) The length N of the conductive cable is specified to meet 1.1M≤N≤1.5M. This range takes into account both the problem of avoiding the contact point being pulled up due to the cable being too short and affecting the connection reliability, and the problem of increasing stress on the contact point due to thermal expansion of the cable being too long at high temperature. Compared with the background technology, which may cause unstable connection or affected signal transmission due to the failure to reasonably consider the cable length factor, this technical solution ensures the reliability of the connection while ensuring the signal transmission quality and speed by reasonably determining the length range of the conductive cable, thereby improving the stability and maintainability of the entire well inclination measurement device.

[0042] 16) The method for measuring well inclination under strong vibration environment in this technical solution can accurately measure well inclination under strong vibration environment underground by a series of steps such as reasonably selecting the range of acceleration measurement module, installing well inclination measurement device at a suitable position, accurately collecting and processing acceleration data, and effectively uploading and displaying well inclination data. Compared with the existing methods in the background technology, it can obtain accurate well inclination data more efficiently, provide strong support for ensuring the quality of wellbore trajectory and improving drilling efficiency, and effectively solve the problems of inaccurate well inclination measurement and low efficiency caused by various limitations of the existing methods.

[0043] 17) By acquiring a large amount of gravity acceleration component data of the X, Y, and Z axes, normal distribution processing is performed and the average value of the data with a distribution frequency interval of 50% is taken to calculate the well inclination data. This processing method can more comprehensively and accurately reflect the actual well inclination situation underground. Compared with the situation in the background technology that may cause large measurement errors due to imperfect data processing methods, this technical solution improves the accuracy and stability of well inclination data calculation by optimizing the data processing method, providing a strong guarantee for accurate measurement of well inclination. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a schematic diagram of the structure of the plane side of the circuit skeleton layout in the well deviation measurement device; Figure 2 It is a schematic diagram of the side cross-sectional structure of the acceleration measurement module; Figure 3 This is a side sectional structural diagram of the main control module installation.

[0045] In the figure: 1. Circuit skeleton; 1.1. Layout plane; 2. Acceleration measurement module; 2.1. PCB board I; 2.2. Accelerometer; 2.3. Fixed frame; 2.4. Silicone; 3. Main control module; 3.1. PCB board II; 3.2. Main control circuit; 4. Conductive cable; 5. Screw assembly; 5.1. Compacted vibration damping gasket; 5.2. Screw body; 6. Axial vibration damping rubber block; 7. Radial vibration damping structure; 7.1. Vibration damping sealing ring; 7.2. PEK annular retaining ring; 8. Vibration damping rubber gasket. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0047] Therefore, the following detailed description of the invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the invention. 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.

[0048] Example 1 This embodiment discloses a well deviation measurement device for use in a strong vibration environment, as a preferred embodiment of the present invention. Figure 1 As shown, it includes a hollow cylindrical compression tube (not shown in the figure), a circuit skeleton 1, an acceleration measurement module 2 and a main control module 3.

[0049] The hollow cylindrical compression tube provides physical protection for the entire measuring device in a strong vibration environment, can resist strong external impact and pressure, and ensure the safety of the internal circuit skeleton 1 and circuit components. Its hollow cylindrical shape design not only ensures the compression resistance, but also helps to reduce the overall weight.

[0050] The circuit skeleton 1 is a cylindrical structure as a whole and is arranged in a hollow cylindrical compression tube. On the one hand, the internal space of the compression tube can be fully utilized for reasonable layout. On the other hand, the cylindrical structure is relatively stable and has good structural integrity in a strong vibration environment, reducing the risk of displacement or damage of internal components caused by vibration. The layout plane 1.1 is hollowed out on the side of the circuit skeleton 1, which provides a stable and specific installation position for the acceleration measurement module 2 and the main control module 3, so that each module is distributed in an orderly manner in space, which is convenient for electrical connection and signal transmission.

[0051] The acceleration measurement module 2 is fixedly mounted on the layout plane 1.1 of the circuit skeleton 1 to detect the acceleration data at its location. This fixing method can reduce its shaking during strong vibration, thereby improving the accuracy and stability of the measurement.

[0052] The main control module 3 is fixedly mounted on the layout plane 1.1 of the circuit skeleton 1 and is electrically connected to the acceleration measurement module 2 through a conductive cable 4. It is used to control the operation and power supply of the acceleration measurement module 2, receive and process acceleration data, and upload the well inclination data after obtaining it.

[0053] In this technical solution, the main control module 3 assumes the control and data processing functions. Its reasonable layout is conducive to efficiently powering and exchanging data with the acceleration measurement module 2, quickly processing acceleration data to obtain well inclination data and uploading it, and ensuring the real-time and accuracy of the entire measurement system. The circuit structure involved in the main control module 3 is existing, and its main principle is: the acceleration measurement module 2 can accurately detect the gravity acceleration components of the X, Y, and Z axes. In well inclination measurement, the well inclination angle can be calculated by a specific algorithm according to the component changes of gravity acceleration in different axial directions. For example, in a vertical well, the gravity acceleration is mainly along the Z axis. When the well is tilted, corresponding gravity acceleration components will appear on the X and Y axes. Through the analysis of these components and mathematical methods such as trigonometric operations, the direction and angle of the well inclination can be obtained. The main control module 3 plays a core control and data processing role in this process. It controls the startup, sampling frequency and other working parameters of the acceleration measurement module 2 according to the preset program and timing to ensure stable and accurate acquisition of acceleration data. The received X, Y, and Z three-axis gravity acceleration component data are then preprocessed by filtering, calibration, and other means to remove measurement errors and noise interference, and the well inclination data is obtained using the well inclination calculation algorithm. Finally, the well inclination data is uploaded to the ground monitoring system or other data storage and analysis equipment through a suitable communication interface.

[0054] In addition, the present technical solution takes into account the tolerance of the acceleration measurement module 2 and the main control module 3 to vibration. Specifically: the acceleration measurement module 2 has high requirements for measurement accuracy, and even tiny vibration displacements may cause measurement errors. In a strong vibration environment, the inertia of the module structure will have a significant impact on the measurement results. Since the acceleration measurement module 2 is small in size and low in weight, the inertia is extremely small when installed alone, which reduces the relative displacement caused by the inertial force, thereby being able to more accurately detect the acceleration data at the location. The main control module 3 has a large overall inertia, and its sensitivity to vibration displacement is relatively low compared to the acceleration measurement module 2. Under strong vibration, even if there is a certain amplitude of low-amplitude vibration displacement, it will not have a serious impact on its working performance. Therefore, the present technical solution separates the acceleration measurement module 2 and the main control module 3 for their different vibration tolerance performance, ensures the high accuracy of the acceleration measurement, and ensures the stable operation of the main control module 3, thereby improving the measurement accuracy and reliability of the entire well inclination measurement device.

[0055] In addition, the separation design makes the acceleration measurement module 2 and the main control module 3 relatively independent during maintenance and upgrading. If the acceleration measurement module 2 fails or requires maintenance operations such as precision calibration, it can be handled separately without affecting the normal operation of the main control module 3. Similarly, when the main control module 3 needs to upgrade the software or replace the hardware to improve the data processing capability, it can also be operated conveniently without large-scale disassembly and reassembly of the entire measurement device, which reduces the maintenance cost and difficulty and improves the maintainability and scalability of the system.

[0056] In summary, this design of separating the acceleration measurement module 2 from the main control module 3 fully considers the different characteristics and working requirements of the two in a strong vibration environment. Only through targeted vibration reduction and installation measures can the overall performance, reliability and maintainability of the well inclination measurement device be effectively improved. It is a reasonable design that adapts to the measurement needs of a strong vibration environment.

[0057] Example 2 This embodiment discloses a well inclination measurement device for strong vibration environment, as a preferred implementation scheme of the present invention, that is, based on Example 1, its acceleration measurement module 2 includes a PCB board Ⅰ2.1 and an accelerometer 2.2, and the accelerometer 2.2 is fixedly mounted on the PCB board Ⅰ2.1.

[0058] The PCB board I2.1 is fixed to the layout plane 1.1 of the circuit skeleton 1 by fastening screws. This mechanical connection method provides a stable and reliable installation basis. The fastening screws can ensure that the PCB board I2.1 will not easily move or loosen in a strong vibration environment, thereby ensuring the stability of the overall structure of the acceleration measurement module 2.

[0059] A vibration-damping silicone layer is provided between the PCB board Ⅰ2.1 and the circuit skeleton 1. The vibration-damping silicone layer is one of the key factors to improve the vibration resistance of the acceleration measurement module 2. It has good elasticity and damping characteristics and can effectively absorb and disperse the vibration energy transmitted from the circuit skeleton 1. When external vibration impact acts on the circuit skeleton 1, the vibration-damping silicone layer will undergo elastic deformation, converting the vibration energy into heat energy and other forms for consumption, thereby reducing the vibration amplitude transmitted to the PCB board Ⅰ2.1. This is crucial for the accelerometer 2.2 installed on the PCB board Ⅰ2.1, because the accelerometer 2.2 is extremely sensitive to vibration, and even a small vibration disturbance may affect its measurement accuracy.

[0060] To sum up, in the present technical solution, the structural design of the acceleration measurement module 2 effectively improves its measurement accuracy, stability and reliability in a strong vibration environment through a reasonable fixing method of the PCB board Ⅰ2.1, the application of the vibration-damping silicone layer and the precise installation of the accelerometer 2.2 on the PCB board Ⅰ2.1. It is an important design feature that meets the working requirements of well inclination measurement in harsh environments.

[0061] Example 3 This embodiment discloses a well inclination measurement device for a strong vibration environment. As a preferred embodiment of the present invention, based on Example 2, the thickness of the vibration-damping silicone layer is 0.2-0.6 mm. When the thickness of the vibration-damping silicone layer is 0.2 mm, it can provide a certain degree of vibration reduction effect without occupying too much space; the thickness of 0.6 mm is based on the balance between the elasticity and stability of the vibration-damping silicone layer itself. Generally speaking, the vibration reduction performance of the vibration-damping silicone layer is positively correlated with the thickness. Within the range of 0.2-0.6 mm, as the thickness increases, the vibration-damping silicone layer can absorb and disperse more vibration energy. However, this positive correlation is not linear and is also affected by other factors such as the elastic modulus of the silicone material. In addition, multiple factors such as the frequency and direction of the vibration need to be considered. For example, for vibrations of certain specific frequencies, a 0.4 mm thick vibration-damping silicone layer may exhibit better vibration reduction effects than a 0.6 mm thick vibration-damping silicone layer due to its resonance characteristics with the vibration frequency.

[0062] The thickness of the vibration-damping silicone layer of 0.2~0.6mm is coordinated with the structural design of the PCB board Ⅰ2.1 and the circuit skeleton 1. Its thickness is determined based on the size and weight of the PCB board Ⅰ2.1 and the vibration characteristics of the circuit skeleton 1. For example, when the size of the PCB board Ⅰ2.1 is large, a thicker vibration-damping silicone layer may be required to ensure a uniform vibration-damping effect and prevent excessive local vibration. At the same time, the material and structure of the circuit skeleton 1 will also affect the transmission mode of vibration, thereby affecting the selection of the thickness of the vibration-damping silicone layer. If the circuit skeleton 1 uses a material with good damping characteristics, the thickness of the silicone layer can be appropriately reduced.

[0063] Example 4 This embodiment discloses a well inclination measurement device for a strong vibration environment. As a preferred implementation of the present invention, based on Embodiment 2 or 3, considering that the pins of the accelerometer 2.2 are relatively fragile in a vibration environment, Figure 2 As shown, a fixing frame 2.3 is provided on the PCB board I 2.1, and the accelerometer 2.2 is potted in the fixing frame 2.3 by means of silica gel 2.4.

[0064] The fixed frame 2.3 provides a clear installation position and physical support structure for the accelerometer 2.2, thereby preventing the accelerometer 2.2 from being displaced or shaken on the PCB board I 2.1 due to external vibration or other factors.

[0065] The accelerometer 2.2 is potted in the fixed frame 2.3 through the silicone 2.4. The silicone itself has good elasticity and damping characteristics, which can further enhance the vibration reduction performance of the accelerometer 2.2. In a strong vibration environment, when the vibration wave is transmitted to the area where the accelerometer 2.2 is located, the silicone can absorb and disperse a large amount of vibration energy through its own elastic deformation, thereby reducing the direct impact of the vibration on the accelerometer 2.2.

[0066] In addition, the silicone 2.4 potting also provides sealing protection for the accelerometer 2.2. The underground environment is usually harsh, and there may be impurities such as water vapor, dust, and corrosive gases. If these impurities enter the interior of the accelerometer 2.2, they are likely to damage the precision components of the accelerometer 2.2 and affect its measurement performance. The sealed environment formed by the silicone 2.4 potting can effectively block the intrusion of these impurities, ensuring that the accelerometer 2.2 works in a relatively clean and dry environment and extending its service life. For example, in a humid underground environment, the silicone 2.4 potting can prevent water vapor from condensing on the surface of the accelerometer 2.2 or entering its interior, maintaining the normal working state of the accelerometer 2.2.

[0067] In summary, the design of setting a fixed frame 2.3 on the PCB board I 2.1 and encapsulating the accelerometer 2.2 with silicone 2.4 comprehensively considers various factors such as the stability, protection requirements and electrical performance of the accelerometer 2.2 in a strong vibration environment, effectively improves the working performance, reliability and service life of the accelerometer 2.2, and provides a strong guarantee for the well inclination measurement device to accurately obtain acceleration data.

[0068] Example 5 This embodiment discloses a well inclination measurement device for a strong vibration environment. As a preferred embodiment of the present invention, based on Example 4, the thickness of the silicone filling in the fixed frame 2.3 is 2-5 mm. Furthermore, before the silicone filling, it is necessary to adjust the thermal expansion coefficient of the silicone to be consistent with that of the PCB board I 2.1 through experiments to avoid stress damage to the accelerometer 2.2 caused by the difference in thermal expansion coefficient.

[0069] When the thickness of the silicone filling is 2mm, it can provide a certain degree of vibration reduction and buffering. In the strong vibration environment underground, this thickness of silicone can effectively absorb and disperse part of the vibration energy.

[0070] The 5mm thick silicone filling can provide a more significant vibration reduction effect. When faced with low-frequency, large-amplitude vibrations that may occur underground (such as sudden strong shaking of the drill pipe), the thicker silicone has more material to consume vibration energy. These strong vibrations can be absorbed through a greater degree of elastic deformation, reducing the impact of vibration on the accelerometer 2.2. At the same time, the 5mm thickness can also cope with complex and changeable vibration directions to a certain extent, because the thicker silicone can buffer vibrations from multiple directions, creating a relatively stable working environment for the accelerometer 2.2.

[0071] Different vibration reduction and installation strategies are adopted to optimize the overall vibration reduction performance of the system. This differentiated design enables the entire well inclination measurement device to work better in a strong vibration environment, ensuring both high-precision acceleration measurement and stable operation of the main control module 3, thereby improving the measurement accuracy and reliability of the entire well inclination measurement device.

[0072] The selection of this thickness range is also the result of considering the space and weight factors of the device. In the well deviation measurement device, the space is limited, and the thickness of the silicone filling cannot be increased indefinitely. The range of 2-5mm ensures that the silicone can play the above-mentioned multiple functions while not occupying too much space on the PCB board Ⅰ2.1, nor making the entire device too heavy due to the silicone filling. If the silicone filling thickness is too large, it will not only increase the size of the device, which is not conducive to underground installation and operation, but also may affect the overall performance of the device due to the increase in weight, such as causing new unstable factors due to increased inertia in a strong vibration environment.

[0073] Example 6 This embodiment discloses a well inclination measurement device for use in a strong vibration environment. As a preferred implementation scheme of the present invention, that is, based on any one of Embodiments 2 to 5, the accelerometer 2.2 is a MEMS accelerometer based on the capacitance effect.

[0074] First, MEMS accelerometers are light and small in size. They weigh only about 1g, which is significantly different from the quartz flexure accelerometer, which weighs about 80g. In applications such as well inclination measurement devices that have certain requirements for space and weight, the small and light characteristics of MEMS accelerometers make it easier to lay out and install.

[0075] Secondly, the MEMS accelerometer itself can withstand vibrations up to 20g, and this vibration resistance is excellent in strong vibration environments. During operations such as downhole drilling, strong vibrations are often generated, and the MEMS accelerometer can withstand vibration accelerations of up to 20g, which means that it can still maintain a relatively stable working state in such a harsh vibration environment and continue to accurately measure acceleration data.

[0076] Third, because the MEMS accelerometer is extremely light, its inertia is small under strong vibration. When there is strong external vibration, the inertial force will affect the accelerometer 2.2 and its soldering pins. The small inertia of the MEMS accelerometer makes it produce less relative displacement and shaking during vibration, thereby reducing the stress impact on the soldering pins.

[0077] Finally, precisely because of the small stress impact on the welding pins, the risk of poor contact and breakage due to loose pins in MEMS accelerometers is greatly reduced. In underground measurement operations in a strong vibration environment for a long time, the stability of the pins is crucial to whether the accelerometer 2.2 can continue to work properly. Quartz flexible accelerometers are heavier, so they may be more likely to have loose pins, poor contact, or even breakage when vibrating, which will affect the accuracy and stability of the measurement data. MEMS accelerometers, with their advantages of light weight and low inertia, greatly reduce these risks and ensure the smooth progress of measurement work.

[0078] In summary, the MEMS accelerometer based on the capacitive effect has obvious advantages over the quartz flexible accelerometer in terms of weight, volume, vibration resistance and protection of welding pins, making it very suitable for use in such devices that need to measure well inclination in a strong vibration environment, and can effectively improve the stability and reliability of the measuring device and the accuracy of the measured data.

[0079] Example 7 This embodiment discloses a well inclination measurement device for a strong vibration environment, as a preferred implementation scheme of the present invention, that is, based on any one of embodiments 2 to 6, its main control module 3 includes a PCB board II 3.1 and a main control circuit 3.2. The main control circuit 3.2 is arranged on the PCB board II 3.1, and its specific circuit structure can adopt the existing technology.

[0080] The PCB board II 3.1 is fixed to the layout plane 1.1 of the circuit skeleton 1 by a plurality of screw assemblies 5. This fixing method provides a stable and reliable mechanical connection. The screw assembly 5 can withstand large tensile and shear forces, and effectively prevent the PCB board II 3.1 from displacement or loosening in a strong vibration environment.

[0081] A vibration-damping rubber gasket 8 is provided between the PCB board Ⅰ2.1 and the circuit skeleton 1, which is the key to improving the vibration resistance of the main control module 3. The vibration-damping rubber gasket 8 has good elasticity and damping characteristics. When the vibration wave is transmitted from the circuit skeleton 1 to the vibration-damping rubber gasket 8, the vibration-damping rubber gasket 8 will undergo elastic deformation, converting the vibration energy into heat energy and other forms of consumption, thereby significantly reducing the vibration amplitude transmitted to the PCB board Ⅱ3.1. For the main control module 3, although its overall inertia is large and it can still work under a certain degree of vibration displacement, the vibration-damping rubber gasket 8 can further reduce the impact of vibration on the precision components in the main control circuit 3.2. In addition, a stable working environment is crucial for the normal operation of the main control circuit 3.2. The vibration-damping rubber gasket 8 reduces vibration interference, which helps the main control circuit 3.2 to accurately control the work of the acceleration measurement module 2, perform data processing, and upload data. For example, in the data processing process, the main control circuit 3.2 needs to accurately calculate and analyze the X, Y, and Z three-axis gravity acceleration component data transmitted by the acceleration measurement module 2. If it is disturbed by strong vibration, it may cause calculation errors or data transmission interruption. The vibration reduction effect provided by the vibration-damping rubber gasket 8 can reduce this risk, ensure that the main control circuit 3.2 stably performs various tasks, and ensure the measurement accuracy of the entire well inclination measurement device and the continuity of data transmission.

[0082] In summary, the structural design of the main control module 3, through a reasonable PCB board II 3.1 fixing method, the application of the vibration-damping rubber gasket 8 and the main control circuit 3.2 using the prior art, effectively improves the stability, reliability and maintainability of the main control module 3 in a strong vibration environment, and provides a strong guarantee for the normal operation of the entire well inclination measurement device.

[0083] In combination with the above-mentioned embodiments including Embodiment 2, the present technical solution adopts different vibration reduction and installation strategies according to the different characteristics of the acceleration measurement module 2 and the main control module 3, thereby optimizing the overall vibration reduction performance of the system. This differentiated design enables the entire well inclination measurement device to work better in a strong vibration environment, ensuring both the high accuracy of the acceleration measurement and the stable operation of the main control module 3, thereby improving the measurement accuracy and reliability of the entire well inclination measurement device.

[0084] Example 8 This embodiment discloses a well deviation measurement device for a strong vibration environment, as a preferred embodiment of the present invention, that is, based on Example 7, as shown in FIG. Figure 3 As shown, all the screw components 5 are arranged in parallel and spaced apart along the length direction of the PCB board II 3.1. This enables the PCB board II 3.1 to be subjected to uniform fixing force in the length direction. When the PCB board II 3.1 is fixed to the layout plane 1.1 of the circuit skeleton 1, each screw component 5 applies a certain pulling force or pressure to ensure its stability. This parallel and spaced arrangement avoids the fixing force being concentrated in certain local areas, so that the PCB board II 3.1 as a whole can remain flat and stable on the circuit skeleton 1.

[0085] In addition, the parallel and spaced arrangement also facilitates installation operations for installers. In underground working environments, the installation space may be relatively limited and the operating conditions may be poor. This regular arrangement allows installers to more clearly determine the installation position of each screw assembly 5 and install them in a certain order, thereby improving installation efficiency. At the same time, in subsequent maintenance or overhaul, it is also easier to locate and remove or replace specific screw assemblies 5, which facilitates related operations on PCB board II 3.1 and main control circuit 3.2.

[0086] Furthermore, the interval between adjacent screw assemblies 5 is 40-60 mm.

[0087] The 40mm spacing is sufficient to ensure that the PCB board II 3.1 is firmly fixed while avoiding some problems caused by too dense screws. If the spacing is too small, on the one hand, the PCB board II 3.1 may be partially deformed during installation due to too many screw installation points, because the force applied by each screw during installation may affect each other; on the other hand, too dense screws may limit the normal deformation of the PCB board II 3.1 under conditions such as thermal expansion or cold contraction to a certain extent, thereby increasing the internal stress of the PCB board II 3.1, affecting its service life and the normal operation of the main control circuit 3.2. The 40mm spacing can provide sufficient fixing force while giving the PCB board II 3.1 a certain deformation space to ensure the stability of its physical state.

[0088] When the interval between adjacent screw components 5 reaches 60mm, while ensuring that PCB board Ⅱ3.1 has a certain deformation space, it can still maintain its sufficient fixing strength. This distance takes into account that in a strong vibration environment, PCB board Ⅱ3.1 needs to have sufficient support to resist the displacement risk caused by vibration. If the interval is too large, some areas of PCB board Ⅱ3.1 may not get enough support during the vibration process, resulting in shaking or loosening, affecting the normal operation of the main control circuit 3.2. The 60mm interval distance not only gives PCB board Ⅱ3.1 appropriate deformation space, but also ensures the stability of PCB board Ⅱ3.1 in a strong vibration environment through a reasonable number of screw components 5 (arranged along the length direction), ensuring the stability and reliability of the main control circuit 3.2.

[0089] In summary, the design in which the screw assemblies 5 are arranged in parallel and spaced apart along the length direction of the PCB board II 3.1 with adjacent intervals between 40 and 60 mm takes into account various factors such as the fixing firmness of the PCB board II 3.1, the deformation space requirement, and the convenience of installation and operation, and effectively improves the stability and maintainability of the main control module 3 in a strong vibration environment, providing a strong guarantee for the normal operation of the entire well inclination measurement device.

[0090] Example 9 This embodiment discloses a well deviation measurement device for a strong vibration environment, as a preferred embodiment of the present invention, that is, based on Example 7 or 8, as shown in FIG. Figure 3 As shown, the screw assembly 5 includes a compacted vibration-damping gasket 5.1 and at least two screw bodies 5.2. The screw bodies 5.2 pass through the compacted vibration-damping gasket 5.1, the PCB board II 3.1 and the vibration-damping rubber gasket 8 in sequence and are then fastened to the circuit skeleton 1.

[0091] First, the setting of the compacted vibration-damping gasket 5.1 further improves the vibration-damping performance of the entire screw assembly 5. In a strong vibration environment, when the vibration is transmitted from the circuit skeleton 1, it will first act on the vibration-damping rubber gasket 8. However, due to the complex vibration situation, the vibration-damping rubber gasket 8 alone may not be able to completely eliminate the impact of the vibration on the PCB board II. The compacted vibration-damping gasket 5.1 can play an additional buffering role between the screw body 5.2 and the PCB board II, and can absorb and disperse part of the vibration energy through its own elastic deformation, thereby reducing the vibration amplitude transmitted to the PCB board II, creating a more stable working environment for the PCB board II and the main control circuit 3.2. For example, during downhole drilling, the high-frequency vibration generated by the drill bit may be transmitted to the screw assembly 5 through the circuit skeleton 1. At this time, the compacted vibration-damping gasket 5.1 can effectively reduce the impact of this high-frequency vibration on the PCB board II.

[0092] Secondly, the screw body 5.2 may cause certain damage to the surface of PCB board II during the tightening process, such as scratches and indentations, which may affect the electrical connection of electronic components on PCB board II or damage the structural integrity of PCB board II. The compaction damping gasket 5.1 is located between the screw body 5.2 and PCB board II, which can play a protective role and prevent the screw body 5.2 from directly contacting the surface of PCB board II, thereby preventing the above-mentioned damage from occurring and ensuring the normal use of PCB board II and the safety of electronic components on its surface.

[0093] Third, the design of using at least two screw bodies 5.2 can provide a more stable mechanical connection between PCB board II and circuit skeleton 1. In a strong vibration environment, a single screw may not be able to withstand the large vibration shear force and tension, which can easily cause PCB board II to loosen or shift. The evenly distributed multiple screw bodies 5.2 (combined with the aforementioned parallel and spaced arrangement along the length direction of PCB board II) can share these forces together to ensure that the fixed position of PCB board II on the circuit skeleton 1 remains unchanged, thereby ensuring the stability of the main control circuit 3.2. For example, when strong vibration occurs underground, two or more screw bodies 5.2 can work together to firmly fix PCB board II on the circuit skeleton 1 like multiple "anchor points" to prevent it from moving out of the correct position due to vibration.

[0094] Fourth, multiple screw bodies 5.2 can also evenly distribute the pressure generated during the tightening process to the PCB board II and the vibration-damping rubber gasket 8. When the screw body 5.2 is tightened, pressure will be applied to the PCB board II and the vibration-damping rubber gasket 8. If there is only one screw, the pressure may be concentrated on one point, causing local deformation or excessive compression. At least two screw bodies 5.2 can make the pressure more evenly distributed on the PCB board II and the vibration-damping rubber gasket 8, avoiding the situation of local excessive pressure, protecting the structural integrity of the PCB board II and the vibration-damping rubber gasket 8, and helping to maintain their normal functions, thereby ensuring the normal operation of the main control module 3.

[0095] Therefore, the overall structure of this technical solution has the following collaborative working effects: Comprehensive vibration reduction guarantee: The entire screw assembly 5 achieves effective vibration suppression through the coordinated work of the compacted vibration-damping gasket 5.1, the vibration-damping rubber gasket 8, and the multiple screw bodies 5.2. The vibration transmitted from the circuit skeleton 1 will first be partially absorbed by the vibration-damping rubber gasket 8, and the remaining vibration will be further buffered by the compacted vibration-damping gasket 5.1, while the multiple screw bodies 5.2 ensure that the connection between the PCB board II and the circuit skeleton 1 is stable during the vibration process and will not loosen due to vibration. This comprehensive vibration reduction measure enables the PCB board II and the main control circuit 3.2 to maintain a relatively stable working state in a strong vibration environment, reducing the possibility of measurement errors and main control circuit 3.2 failures caused by vibration.

[0096] Stable connection and protection: On the one hand, the tight connection between the screw body 5.2 and the circuit skeleton 1 ensures the fixed position of the PCB board II and provides stable physical support for the main control circuit 3.2. On the other hand, the compacted vibration damping gasket 5.1 protects the surface of the PCB board II, preventing the screw body 5.2 from damaging it, and also enhances the vibration damping effect. This structural design not only achieves a stable connection, but also provides the necessary protection, making the main control module 3 more perfect in structure, and can better adapt to the working requirements in a strong vibration environment, providing a strong guarantee for the normal operation of the entire well inclination measurement device.

[0097] In summary, the design of the screw assembly 5, which includes a compacted vibration-damping gasket 5.1 and at least two screw bodies 5.2, fully considers multiple factors such as vibration reduction, connection stability, and protection of PCB board II, and effectively improves the stability, reliability, and maintainability of the main control module 3 in a strong vibration environment.

[0098] Example 10 This embodiment discloses a well inclination measurement device for use in a strong vibration environment. As a preferred implementation scheme of the present invention, based on Example 9, the thickness of the vibration-damping gasket and the vibration-damping rubber gasket 8 are both 2-3 mm.

[0099] When the thickness of the vibration-damping gasket and the vibration-damping rubber gasket 8 is 2 mm, they can already play a certain role in vibration reduction. A vibration-damping gasket and a vibration-damping rubber gasket 8 with a thickness of 3 mm can provide a more significant vibration reduction effect. In the face of low-frequency, large-amplitude vibrations that may occur underground (such as sudden and strong shaking of the drill pipe), thicker gaskets have more material to consume vibration energy.

[0100] In the design of the well inclination measuring device, space is a factor that needs to be considered. For the vibration-damping gasket and the vibration-damping rubber gasket 8, the thickness range of 2~3mm ensures that they can play the vibration-damping function while not occupying too much valuable space inside the device. They can not only meet the vibration-damping requirements, but also coexist reasonably with other components in the device, ensuring the compactness and functionality of the entire well inclination measuring device. In addition, the 2~3mm thick gasket will not affect the tightening effect of the screw body 5.2 due to being too thick, nor will it be unable to effectively play the vibration-damping and protective role due to being too thin. While ensuring the realization of its own functions, it can adapt to the surrounding components.

[0101] From the perspective of durability, 2~3mm thick vibration-damping gaskets and vibration-damping rubber gaskets 8 have better performance. In a long-term strong vibration environment, the gasket needs to continuously withstand the impact and consumption of vibration energy. Gaskets in this thickness range can still maintain relatively stable physical properties after multiple elastic deformations, and will not easily experience material fatigue, cracking, etc. From the perspective of stability, the appropriate thickness of 2~3mm ensures that the gasket can function stably during the vibration process. It will not be too thick to cause excessive deformation, displacement and other unstable phenomena during the vibration process, nor will it be too thin to effectively buffer vibration.

[0102] In summary, the design of the vibration-damping gasket and the vibration-damping rubber gasket 8 with a thickness of 2 to 3 mm takes into account multiple factors such as vibration reduction effect, space and structural compatibility, durability and stability. It is a reasonable design that can effectively meet the working requirements of the well inclination measurement device in a strong vibration environment.

[0103] Embodiment 11 This embodiment discloses a well inclination measurement device for use in a strong vibration environment. As a preferred implementation scheme of the present invention, based on Embodiment 8, 9 or 10, its PCB board II3.1 includes 4 to 6 stacked wiring layers, and the glass fiber reinforced polypropylene material is tightly bonded between adjacent wiring board layers.

[0104] The multi-layer structure of PCB board II 3.1 helps to improve the anti-interference ability of the circuit. In the working environment of the well inclination measurement device, there may be a variety of electromagnetic interference sources, such as the electromagnetic field generated by other electrical equipment underground. The multi-layer wiring layer can distribute circuits with different functions in different layers through reasonable wiring planning, and use the shielding effect between layers to reduce the impact of external electromagnetic interference on the internal circuit. For example, the sensitive signal transmission line is arranged in the inner layer, and the relatively less sensitive power supply line is arranged in the outer layer, so as to effectively isolate the electromagnetic interference, ensure that the main control circuit 3.2 can accurately receive and process the signal from the acceleration measurement module 2, and improve the accuracy of the measurement data.

[0105] In addition, the multi-layer wiring layer of PCB board II 3.1 can also improve the stability of the circuit. In a strong vibration environment, a circuit board with a single wiring layer may have problems such as loose lines and short circuits due to vibration. The multi-layer wiring layers can disperse the impact of vibration on the circuit to a certain extent through close connection and collaborative work with each other. For example, when encountering strong vibrations caused by downhole drilling, even if a certain wiring layer has local line changes, other wiring layers can still maintain normal circuit connectivity, ensure the stable operation of the main control circuit 3.2, reduce the risk of circuit failures caused by vibration, and ensure that the well inclination measurement device can continue to and accurately perform measurement work.

[0106] Glass fiber reinforced polypropylene material is used to tightly bond adjacent wiring board layers, and this material plays a key role in connection and reinforcement. In the PCB board II structure with multiple wiring layers, the firm connection between adjacent wiring board layers is the basis for ensuring the normal operation of the entire circuit board. Glass fiber reinforced polypropylene material can fill the gaps between adjacent wiring board layers to form a tight bond, preventing adjacent wiring board layers from delamination and loosening in a strong vibration environment. For example, during downhole operations, the vibration of the drill pipe will be transmitted to the well inclination measurement device. If the adjacent wiring board layers are not firmly bonded, it may cause damage to the internal structure of the circuit board and affect the normal operation of the main control circuit 3.2. The tight bonding effect of glass fiber reinforced polypropylene material effectively avoids the occurrence of such problems.

[0107] Furthermore, the glass fiber reinforced polypropylene material is composed of 2 to 3 layers of glass fiber cloth and 50% to 70% by volume of polypropylene resin. This material composition can effectively reduce the stress on the connection points between the layers of the circuit board when the circuit board is bent by strong vibration. Under strong vibration conditions, the circuit board will inevitably bend and deform, which will exert certain stress on the connection points between the layers. The glass fiber cloth has high strength and rigidity and can resist this bending deformation to a certain extent, while the polypropylene resin has good flexibility and adhesion and can tightly combine the glass fiber cloth with the adjacent cloth board layers. When the circuit board is bent, the glass fiber reinforced polypropylene material can disperse the stress to a larger area through its own characteristics, thereby reducing the impact on the connection points between the layers, protecting the connection points between the layers from damage, ensuring the stability of the electrical connection of the main control circuit 3.2, and maintaining the normal operation of the circuit.

[0108] In summary, the design of PCB board II improves the anti-interference ability and stability of the circuit through multi-layer stacked wiring layers. At the same time, it uses glass fiber reinforced polypropylene material to tightly bond adjacent wiring layers and reduce the influence of stress on the connection points between layers, so that PCB board II can better adapt to work requirements in a strong vibration environment, providing a strong guarantee for the normal operation of the entire well inclination measurement device.

[0109] Example 12 This embodiment discloses a well inclination measurement device for use in a strong vibration environment. As a preferred implementation scheme of the present invention, based on any one of embodiments 1 to 11, a plurality of radial vibration damping structures 7 are arranged on the circuit skeleton 1 at intervals along the axial direction; each radial vibration damping structure 7 includes a vibration damping sealing ring 7.1, and PEK annular retaining rings 7.2 are respectively arranged on both axial sides of the vibration damping sealing ring 7.1.

[0110] The vibration-damping seal ring 7.1 is one of the core components of the radial vibration-damping structure 7. In a strong vibration environment, when the vibration wave is transmitted from the outside (hollow cylindrical pressure-resistant tube) to the circuit frame 1, the vibration-damping seal ring 7.1 can absorb and disperse part of the vibration energy through its own elastic deformation.

[0111] The PEK annular retaining ring is arranged on both sides of the axial direction of the vibration damping sealing ring 7.1, playing an important auxiliary and protective role. On the one hand, it can limit the excessive deformation of the vibration damping sealing ring 7.1 in the axial direction. On the other hand, the PEK annular retaining ring can also protect the vibration damping sealing ring 7.1 from damage by external factors. Specifically: PEK material has excellent high temperature resistance, good mechanical strength and high dimensional stability. In a high temperature environment, PEK material can still maintain its physical properties and chemical stability. This PEK annular retaining ring is arranged on both sides of the vibration damping sealing ring 7.1. When the vibration damping sealing ring 7.1 is squeezed and expanded at high temperature, it wraps and restricts the vibration damping sealing ring 7.1 to prevent the vibration damping sealing ring 7.1 from expanding to direct contact with the metal of the circuit skeleton 1 and being scratched to reduce the sealing performance; the PEK annular retaining ring has a certain flexibility, and the gap with the external pressure-resistant cylinder is smaller after installation. When the sealing ring expands, it will not be plastically deformed and stuck and damaged.

[0112] A plurality of radial vibration reduction structures 7 are arranged at intervals along the axial direction of the circuit frame 1. This arrangement can more comprehensively reduce vibration and protect the circuit frame 1. The radial vibration reduction structures 7 at different positions can respectively process vibrations from different directions and different parts.

[0113] Furthermore, axial vibration-damping rubber blocks 6 are respectively embedded at both ends of the circuit skeleton 1. During underground operations, in addition to radial vibration, there is also axial vibration. The two axial vibration-damping rubber blocks 6 mainly reduce the vibration of the circuit skeleton 1 in the axial direction.

[0114] In an actual strong vibration environment, the vibration is often complex, with both radial vibration and axial vibration. The axial vibration-damping rubber block 6 and the radial vibration-damping structure 7 work together to build a relatively complete vibration-damping system. The radial vibration-damping structure 7 mainly handles the vibration of the circuit skeleton 1 in the radial direction, while the axial vibration-damping rubber block 6 is responsible for the vibration treatment in the axial direction. Through the coordinated cooperation of these two vibration-damping structures, the circuit skeleton 1 can be fully vibration-damped, so that the entire circuit skeleton 1 and its internal components can be effectively protected from vibration in various vibration directions, thereby improving the vibration resistance of the entire well inclination measurement device and ensuring the normal operation of the measurement device and the accuracy of the measurement data.

[0115] In summary, the radial vibration damping structure 7 and the axial vibration damping rubber block 6 arranged on the circuit skeleton 1, through their respective vibration damping functions and mutual cooperation, effectively improve the vibration resistance of the circuit skeleton 1 in a strong vibration environment, and provide a strong guarantee for the normal operation of the entire well inclination measurement device.

[0116] Embodiment 13 This embodiment discloses a well inclination measurement device for a strong vibration environment, as a preferred implementation scheme of the present invention, that is, based on any one of embodiments 1 to 12, while the acceleration measurement module 2 and the main control module 3 are relatively independently arranged, it is necessary to consider the interference and loss in the signal transmission process. Through a tight layout, the distance between the two in space can be minimized as much as possible, thereby reducing the length of the conductive cable 4. This tight layout is designed by comprehensively considering the structural characteristics of the entire well inclination measurement device and the functional requirements of each module. For example, on the layout plane 1.1 of the circuit skeleton 1, the installation positions of the acceleration measurement module 2 and the main control module 3 are reasonably planned so that their connection contacts can be relatively close, creating conditions for shortening the length of the conductive cable 4.

[0117] When the length of the conductive cable 4 is reduced, the interference and loss during signal transmission can be significantly reduced. During signal transmission, the cable itself will cause certain attenuation and interference to the signal, such as electromagnetic interference, resistance loss, etc. A shorter cable means that the length of the medium through which the signal passes during transmission is shorter, and the impact of these adverse factors is relatively small. This helps to ensure the quality of data transmission, so that the acceleration data transmitted from the acceleration measurement module 2 to the main control module 3 can be received more accurately and completely, and at the same time it can also increase the speed of data transmission, meeting the needs of the well inclination measurement device to obtain and process data in real time.

[0118] Let the length of the conductive cable 4 be N, let the contact distance between the acceleration measurement module 2 and the main control module 3 be M, then 1.1M≤N≤1.5M. The length N of the conductive cable 4 is required to meet 1.1M≤N, which is mainly considered to avoid problems caused by the cable being too short. If the cable length is too short, during installation or in subsequent use, due to some minor position changes or vibrations and other factors, the cable may pull up the connection contacts, causing the connection points to bear additional tension. This additional tension may destroy the stability of the connection point, causing problems such as poor contact, and thus affecting the reliability of signal transmission. At the same time, setting N≤1.5M takes into account the impact of thermal expansion and contraction on the cable and the connection point. Under different temperature environments, the conductive cable 4 will expand and contract. If the cable length is too long, in a high temperature environment, the cable may add additional stress to the connection points at both ends when it expands thermally. This additional stress will also affect the reliability of the connection point, which may cause the connection point to loosen or be damaged, thereby affecting signal transmission.

[0119] Although a rough range of 1.1M≤N≤1.5M is specified, the cable length is not particularly critical overall. This is because in the actual design and manufacturing process, the impact of cable length on signal transmission has been minimized through tight layout and other means. Moreover, within this range, even if the cable length fluctuates to a certain extent, the reliability of the connection and the quality and speed of signal transmission can still be guaranteed through reasonable installation technology and some auxiliary measures (such as strengthening the connection points). Therefore, this range is more of a relatively reasonable range of values ​​given after comprehensive consideration of various factors, so that in different actual application scenarios, it can better meet the requirements of the well inclination measurement device for signal transmission.

[0120] In summary, when the acceleration measurement module 2 and the main control module 3 are relatively independently arranged, the design of the length of the conductive cable 4 fully considers various factors such as interference and loss in the signal transmission process, the influence of thermal expansion and contraction on the connection point, etc. By reasonably determining the value range, while ensuring the signal transmission quality and speed, the reliability of the connection is also ensured, providing a strong guarantee for the normal operation of the entire well inclination measurement device.

[0121] Embodiment 14 This embodiment discloses a well inclination measurement device for use in a strong vibration environment. As a preferred implementation scheme of the present invention, Examples 1 to 13 are combined to apply the well inclination measurement device in practice. Experiments show that its ability to resist downhole vibrations reaches 30 to 50 g, and its ability to resist transient impact vibrations reaches more than 1000 g, which is significantly improved compared with the conventional well inclination measurement module's ability to resist downhole vibrations of 10 g and transient impact vibrations of 200 to 500 g.

[0122] In addition, the inclination measurement tool while drilling using this well inclination measurement device can work normally in a strong vibration environment with a downhole vibration of 15g and an instantaneous maximum impact vibration of 291g in field applications.

[0123] In the field application, the inclination measurement device used in the drilling while drilling inclination measurement tool does not need to consider the vibration failure of the drilling while drilling in the case of aggressive drilling parameters, which is conducive to drilling speed increase. At the same time, it can be installed within 1.5m of the drill bit to shorten the zero length of inclination measurement. The fault interval of the module in the well is greater than 750h, which is more than 3 times higher than the fault interval of the conventional module.

[0124] Embodiment 15 This embodiment discloses a method for measuring well deviation in a strong vibration environment, which, as a preferred implementation scheme of the present invention, comprises the following steps: S1, select an acceleration measurement module 2 with a suitable range, and participate in assembling a well inclination measurement device as described in any one of Examples 1 to 12.

[0125] The accelerometer 2.2 in the acceleration measurement module 2 has the characteristic that the accuracy decreases as the range increases. This is because accelerometers 2.2 of different ranges have different focuses in design and manufacturing. Generally speaking, in order to measure larger acceleration values, accelerometers 2.2 of larger ranges may make certain compromises in sensitivity and accuracy. For example, for an accelerometer 2.2 with a range of ±50g, it may not be able to capture subtle differences as accurately as an accelerometer 2.2 with a range of ±2g when measuring small acceleration changes.

[0126] This technical solution performs buffering and vibration reduction treatment on the well inclination measurement device, so that the dynamic vibration value transmitted to the acceleration measurement module 2 is reduced to less than 10g. In this case, in order to ensure the well inclination measurement accuracy of ±0.1°, the accelerometer 2.2 range needs to be carefully selected. The selection between ±2g and ±10g is a comprehensive consideration of many factors. On the one hand, this range can meet the actual acceleration conditions that may be encountered after the vibration reduction treatment. It will not cause measurement overflow when encountering slightly larger vibrations due to the small range, nor will it cause a serious decrease in accuracy due to the large range, affecting the well inclination measurement accuracy. For example, if a range of ±20g is selected, although larger vibrations can be measured, for well inclination measurements with higher precision requirements, it may be impossible to accurately obtain the accurate value of the well inclination data within the range of ±0.1° due to insufficient accuracy.

[0127] S2, install the well inclination measuring device on the drilling tool and lower it into the well together with the drilling tool. Preferably, the installation position of the well inclination measuring device is 1.2~1.8m away from the drill bit. This distance is selected mainly to consider the impact of the strong vibration generated by the drill bit when it is working on the well inclination measuring device. If it is too close to the drill bit, the high-frequency and high-intensity vibration of the drill bit will be directly transmitted to the well inclination measuring device. Even if the device has certain vibration reduction measures, the measurement accuracy may be affected due to excessive vibration, and even the electronic components inside the device may be damaged. For example, if the installation distance is within 0.5m, the vibration of the drill bit may cause the vibration value received by the acceleration measurement module 2 to far exceed the expected 10g after vibration reduction treatment, resulting in inaccurate measurement. If it is too far away from the drill bit, it may not be possible to accurately obtain the well inclination information of the area near the drill bit, because the well inclination may change more significantly near the drill bit, and as the distance increases, the real-time and correlation of the measurement may decrease. For example, if it is installed 3m away from the drill bit, some rapid changes in well inclination near the drill bit may be missed, which is not conducive to accurate monitoring of well inclination during the entire drilling process.

[0128] S3, when measuring the well inclination, the main control module 3 in the well inclination measuring device controls the acceleration measuring module 2 to collect the acceleration data at the location; the acceleration data is the gravity acceleration components of the three axes X, Y, and Z at the location of the well inclination measuring device. This acquisition method is based on the principle of well inclination measurement. By obtaining the gravity acceleration components in different axes, the well inclination angle can be calculated using existing mathematical algorithms. For example, when the well inclination measuring device is in a vertical state, the gravity acceleration is mainly along the Z axis. When the well is tilted, corresponding gravity acceleration components will appear on the X and Y axes. The specific situation of the well inclination can be obtained by analyzing and calculating these components.

[0129] S4, the main control module 3 decodes and settles the acceleration data to obtain the well inclination data. The decoding process involves parsing the signal transmitted by the acceleration measurement module 2 and restoring it to the actual acceleration value. The settlement process uses a specific algorithm to calculate the well inclination angle and other related data based on the collected gravity acceleration components of the X, Y, and Z axes. For example, mathematical tools such as trigonometric functions may be used, combined with known gravity acceleration constants, to calculate the direction and angle of the well inclination and other accurate information through the calculation of each axis component, so as to obtain well inclination data that meets the accuracy requirements.

[0130] S5, upload the well inclination data to the ground receiving device through the upper transmission device. The upper transmission device here adopts a variety of transmission methods such as wired or wireless, depending on the actual situation and technical requirements of the downhole operation. For example, in some shallow wells, wired transmission can be used to stably transmit the well inclination data to the ground through cables; while in some deep wells or complex geological conditions, wireless transmission methods can be used, such as using electromagnetic waves for data transmission, to overcome some limitations of wired transmission over long distances and in complex environments.

[0131] The ground receiving equipment reads and displays the well inclination data. The purpose of this link is to allow ground staff to intuitively understand the well inclination situation. Through visual display methods, such as presenting well inclination angle, direction and other information in the form of charts, numbers, etc. on the display screen, staff can timely grasp the well inclination changes during the drilling process, so as to adjust the drilling process and parameters in time according to this information, to ensure the smooth progress of drilling operations and the quality control of the well.

[0132] In summary, this method for measuring well inclination in a strong vibration environment can accurately measure well inclination in a strong vibration environment by reasonably selecting the range of the acceleration measurement module 2, determining the installation position of the well inclination measurement device, accurately collecting and processing acceleration data, and effectively uploading and displaying well inclination data. It can provide important well inclination information for drilling projects and ensure the quality and efficiency of drilling operations.

[0133] Example 16 This embodiment discloses a method for measuring well deviation in a strong vibration environment. As a preferred implementation of the present invention, based on Embodiment 15, in step S4, decoding and settling the acceleration data includes: 50 to 200 sets of gravity acceleration component data are obtained for the X, Y, and Z axes respectively. The selection of this data range is reasonable, and sufficient data can more comprehensively and accurately reflect the acceleration state of the well inclination measurement device at different times. In a strong vibration environment, the vibration conditions downhole are complex and changeable, and only a few sets of data may not accurately capture the true law of acceleration changes. For example, if only 10 sets of data are obtained, the overall acceleration situation may be misjudged due to accidental factors (such as a short abnormal vibration). 50-200 sets of data can avoid this situation to a certain extent. Through the accumulation of a large amount of data, it is more likely to cover various possible vibration situations, thereby providing a reliable basis for subsequent accurate processing and well inclination calculation.

[0134] All gravity acceleration component data are processed with normal distribution in units of axes. This step is mainly to normalize and extract features from the large amount of data obtained. In the actual downhole environment, the distribution of acceleration data is often irregular due to the influence of various factors (such as drill bit vibration, formation changes, etc.). Through normal distribution processing, these irregular data can be converted into a distribution form with certain rules, making the data easier to analyze and process. For example, after normal distribution processing, the originally chaotic data may present a distribution feature similar to a bell curve, so that important information such as the concentration trend and dispersion degree of the data can be more clearly seen. This processing method is helpful for the subsequent calculation of well deviation data. Because the normal distribution has some known mathematical properties, statistics such as mean and standard deviation can be easily obtained from the data of normal distribution. These statistics are very important for understanding the overall characteristics of the data, and can serve as an important basis for the subsequent calculation of well deviation data. For example, by analyzing the mean and standard deviation of the data after normal distribution processing, the average level and fluctuation of acceleration in a certain axis can be determined, and then the well deviation angle can be accurately calculated by combining the data of other axes.

[0135] The average value of the data with a distribution frequency interval of 50% is taken to calculate the well deviation data. This step comprehensively considers the representativeness and stability of the data. In the normally distributed data, different intervals contain different amounts of information and data characteristics. Selecting the 50% interval means selecting the part where the data distribution is more concentrated, and this part of the data is relatively more representative of the typical acceleration situation in the axis. For example, in the normal distribution curve, the 50% interval usually covers the middle part of the curve, that is, the part where the data is relatively concentrated and the fluctuation is relatively small. By taking the average value of this part of the data, the impact of individual extreme data (such as occasional extremely large or extremely small acceleration values) on the well deviation calculation can be reduced, thereby improving the accuracy and stability of the calculation results.

[0136] After obtaining the data averages of the 50% intervals of the X, Y, and Z axes after the above processing, these averages can be used in combination with specific mathematical algorithms to calculate the well deviation data. For example, according to the trigonometric function relationship, the average values ​​of the three axes are substituted into the corresponding formula, and the angle size and direction of the well deviation and other information are obtained by calculation. The specific calculation method is the existing technology.

[0137] In summary, the series of operations of decoding and settling the acceleration data in step S4 can effectively improve the accuracy and stability of well inclination data calculation by obtaining a sufficient amount of data, performing normal distribution processing, and selecting the average value of data in a suitable interval, thereby providing a strong guarantee for accurate measurement of well inclination in a strong vibration environment.

Claims

1. A well inclination measurement device for strong vibration environment, characterized by: The invention comprises a hollow cylindrical pressure-resistant tube, a circuit skeleton (1), an acceleration measurement module (2) and a main control module (3); the circuit skeleton (1) is in an overall cylindrical structure and is arranged in the hollow cylindrical pressure-resistant tube, and a layout plane (1.1) is hollowed out on its side; the acceleration measurement module (2) is fixedly mounted on the layout plane (1.1) of the circuit skeleton (1) and is used to detect acceleration data at its location; the main control module (3) is fixedly mounted on the layout plane (1.1) of the circuit skeleton (1) and is electrically connected to the acceleration measurement module (2) via a conductive cable (4) and is used to control the operation and power supply of the acceleration measurement module (2), receive and process acceleration data, and upload the acquired well inclination data; the acceleration data is the gravitational acceleration components of the three axes of X, Y and Z.

2. A well inclination measurement device for use in a strong vibration environment as claimed in claim 1, characterized in that: The acceleration measurement module (2) comprises a PCB board I (2.1) and an accelerometer (2.2); the PCB board I (2.1) is fixed to the layout plane (1.1) of the circuit skeleton (1) by means of fastening screws, and a vibration-damping silicone layer is provided between the PCB board I (2.1) and the circuit skeleton (1); and the accelerometer (2.2) is fixedly mounted on the PCB board I (2.1).

3. A well deviation measurement device for use in a strong vibration environment as claimed in claim 2, characterized in that: The thickness of the vibration-damping silicone layer is 0.2-0.6 mm.

4. A well deviation measurement device for use in a strong vibration environment as claimed in claim 2, characterized in that: A fixed frame (2.3) is provided on the PCB board I (2.1), and the accelerometer (2.2) is potted in the fixed frame (2.3) by means of silica gel (2.4).

5. A well deviation measurement device for use in a strong vibration environment as claimed in claim 4, characterized in that: The thickness of the silica gel filling in the fixed frame (2.3) is 2 to 5 mm.

6. A well inclination measurement device for use in a strong vibration environment as claimed in claim 2, characterized in that: The accelerometer (2.2) is a MEMS accelerometer based on the capacitance effect.

7. A well inclination measurement device for use in a strong vibration environment as claimed in claim 1, characterized in that: The main control module (3) comprises a PCB board II (3.1) and a main control circuit (3.2), wherein the main control circuit (3.2) is arranged on the PCB board II (3.1); the PCB board II (3.1) is fixed to the layout plane (1.1) of the circuit skeleton (1) by means of a plurality of screw assemblies (5), and a vibration-damping rubber gasket (8) is arranged between the PCB board I (2.1) and the circuit skeleton (1).

8. A well deviation measurement device for use in a strong vibration environment as claimed in claim 7, characterized in that: All the screw assemblies (5) are arranged in parallel and spaced apart along the length direction of the PCB board II (3.1), and the interval between adjacent screw assemblies (5) is 40 to 60 mm.

9. A well deviation measurement device for use in a strong vibration environment as claimed in claim 7, characterized in that: The screw assembly (5) comprises a compacted vibration-damping gasket (5.1) and at least two screw bodies (5.2); the screw bodies (5.2) sequentially pass through the compacted vibration-damping gasket (5.1), the PCB board II (3.1) and the vibration-damping rubber gasket (8) and are then fastened to the circuit frame (1).

10. A well deviation measurement device for use in a strong vibration environment as claimed in claim 9, characterized in that: The thickness of the vibration-damping gasket and the vibration-damping rubber gasket (8) are both 2-3 mm.

11. A well deviation measurement device for use in a strong vibration environment as claimed in claim 8, characterized in that: The PCB board II (3.1) includes 4 to 6 stacked wiring layers, and the glass fiber reinforced polypropylene material is tightly bonded between adjacent wiring board layers.

12. A well inclination measurement device for use in a strong vibration environment as claimed in claim 11, characterized in that: The glass fiber reinforced polypropylene material is composed of 2 to 3 layers of glass fiber cloth and 50% to 70% by volume of polypropylene resin.

13. A well deviation measurement device for use in a strong vibration environment as claimed in claim 1, characterized in that: A plurality of radial vibration reduction structures (7) are arranged at intervals along the axial direction on the circuit frame (1); each radial vibration reduction structure (7) comprises a vibration reduction sealing ring (7.1), and PEK annular retaining rings (7.2) are respectively arranged on both axial sides of the vibration reduction sealing ring (7.1).

14. A well deviation measurement device for use in a strong vibration environment as claimed in claim 1, characterized in that: Axial vibration-damping rubber blocks (6) are respectively embedded at both ends of the circuit frame (1).

15. A well inclination measurement device for use in a strong vibration environment as claimed in claim 1, characterized in that: Let the length of the conductive cable (4) be N, and let the contact distance between the acceleration measurement module (2) and the main control module (3) be M, then 1.1M≤N≤1.5M.

16. A method for measuring well deviation in a strong vibration environment, characterized in that: The following steps are involved: S1, selecting an acceleration measurement module (2) of a suitable range, and participating in assembling a well inclination measurement device as claimed in any one of claims 1 to 15; S2, installing the well inclination measuring device on the drilling tool and lowering it into the well together with the drilling tool; S3, when measuring the well inclination, the main control module (3) in the well inclination measuring device controls the acceleration measuring module (2) to collect acceleration data at the location; the acceleration data is the gravity acceleration components of the three axes X, Y, and Z at the location of the well inclination measuring device; S4, the main control module (3) decodes and settles the acceleration data to obtain well deviation data; S5, uploading the well inclination data to the ground receiving equipment through the upper transmission device.

17. A method for measuring well deviation in a strong vibration environment as claimed in claim 16, characterized in that: In step S2, the installation position of the well inclination measuring device is 1.2-1.8 m away from the drill bit.

18. A method for measuring well deviation in a strong vibration environment as claimed in claim 16, characterized in that: In step S4, decoding and settling the acceleration data includes: Obtain 50~200 sets of gravity acceleration component data for the X, Y, and Z axes respectively; Taking the axis as the unit, all gravity acceleration component data are processed into normal distribution; The average value of the data with a distribution frequency interval of 50% is taken to calculate the well deviation data.

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