A high-precision dynamic continuous inclinometer while drilling

Abstract

This invention belongs to the field of measurement-while-drilling (MWD) technology and discloses a high-precision dynamic continuous inclinometer. It includes a drill collar, a flow channel connector assembly, a probe assembly, and a rigid connection assembly, all sequentially arranged and connected within the drill collar. The probe assembly includes a probe housing and a probe frame assembly and a quick-rotation structure assembly sequentially arranged within it, connected by a semi-adhesive interlocking structure. The probe frame assembly houses a main control power circuit board, a data acquisition circuit board, three orthogonally arranged quartz flexible accelerometers, a fluxgate processing circuit, and a fluxgate sensor. The quick-rotation structure assembly includes a shaft, a quick-rotation nut, and a helical damper. The upper end of the shaft is connected to a semi-adhesive adapter via the helical damper, and the lower end is fitted with a quick-rotation nut, which is threaded into the probe housing. When screwed on, the nut pushes the shaft shoulder, causing the probe frame assembly to move linearly within the probe housing. This invention enables high-precision, high-reliability dynamic continuous measurement under complex drilling conditions.

Description

Technical Field

[0001] This invention relates to the field of measurement while drilling technology, and specifically to a high-precision dynamic continuous inclinometer for drilling. Background Technology

[0002] Measurement While Drilling (MWD) technology is one of the core technologies of modern drilling operations. It is used to measure downhole parameters in real time during drilling, such as inclination angle, azimuth angle, and tool face angle, to achieve precise control of the wellbore trajectory and geological guidance. Among them, the MWD instrument is a key component of the MWD system, and its measurement accuracy, reliability, and operational efficiency directly affect drilling safety, economy, and ultimate oil and gas recovery.

[0003] Existing measurement-while-drilling (MWD) instruments mainly employ the following technical solutions: 1) Traditional drill collar structure: In existing technologies, drill collars typically use slotted, through-hole, or gun-drilled structures to arrange internal cables. Connecting wires require external conduits or dedicated channels for connection, resulting in complex structures and poor sealing performance. 2) Probe support method: Existing probe assemblies are typically supported inside the drill collar using simple centralizer structures. The probe is prone to circumferential rotation inside the drill collar, affecting measurement accuracy. Some existing technologies use keyway fittings or pin fixing methods, but these are complex to install and have low reliability. 3) Flow channel joint structure: Existing flow channel joints mostly adopt an integral structure, which is difficult to manufacture, time-consuming, and costly. They also have low integration of grounding and vibration damping functions, insufficient mud sealing performance, and are prone to mud intrusion into electrical connection points, causing short circuits or signal interference. 4) Probe Installation Method: Existing probe frames are typically installed into the probe housing by direct push-in or rotation. This generates significant frictional torque between the shock-absorbing O-rings on the probe frame and the inner wall of the probe housing, leading to severe wear of the O-rings. The helical shock absorber also bears additional torsional stress, affecting its service life and measurement reliability. 5) Sensor Configuration: Existing inclinometers often use a combination of a triaxial accelerometer and a triaxial fluxgate magnetometer. In environments with magnetic interference (such as near ferromagnetic materials like drill collars or casing), the accuracy of azimuth measurement is severely affected. While existing inclinometers can also measure drill rod rotation speed using fluxgate sensors, measurements outside the measurement area are greatly affected by magnetic interference, limiting dynamic measurement capabilities.

[0004] The existing technologies described above have the following main drawbacks: First, the drill collar structure is complex: the slotted, through-hole, and gun-drilled structures weaken the structural strength of the drill collar, and the external wiring is easily damaged by the harsh downhole environment, resulting in poor sealing reliability. Second, the anti-rotation effect is poor: the existing anti-rotation structure is complex and difficult to install, requiring high precision in the fit between the anti-rotation ring and the drill collar. In downhole vibration environments, it is prone to loosening, leading to circumferential movement of the probe and affecting measurement accuracy. Third, the mud sealing performance is poor: the integral flow channel joint cannot simultaneously meet the multiple requirements of vibration reduction, grounding, and sealing, and mud can easily intrude into electrical connection points, causing equipment failure. Fourth, the probe installation is difficult: direct pushing or rotating installation methods subject the vibration-damping O-ring and helical vibration damper to additional friction and torsional torque, accelerating wear and reducing reliability and service life. Fifth, the anti-magnetic interference capability is weak: traditional fluxgate sensors experience decreased measurement accuracy in environments with magnetic interference and cannot measure drill pipe rotation speed, limiting the application of dynamic continuous measurement. Sixth, the internal locking is unreliable: the existing locking structure is prone to loosening under the high pressure, high temperature and strong vibration environment downhole, which can cause the probe to move axially and affect the stability of the measurement. Summary of the Invention

[0005] In view of the problems existing in the prior art, the present invention proposes a high-precision dynamic continuous surveying instrument that can achieve high precision and high reliability under complex and harsh drilling conditions, so as to improve the efficiency, safety and trajectory control level of drilling operations.

[0006] The high-precision dynamic continuous surveying instrument for drilling according to the present invention includes: a drill collar, a flow channel connector assembly, a probe assembly, and a rigid connection assembly sequentially arranged and connected within the drill collar. The probe assembly includes a probe housing connected between the flow channel connector assembly and the rigid connection assembly, a probe skeleton assembly and a quick-rotation structure assembly sequentially arranged within the probe housing and connected to the probe skeleton assembly via a half-locking structure. The half-locking structure includes a connecting half-lock located at the rear end of the probe skeleton assembly and a half-locking adapter located at the front end of the quick-rotation structure assembly. The device includes a frame, a main control power circuit board fixedly mounted on the frame, a data acquisition circuit board, three quartz flexible accelerometers arranged orthogonally in pairs, a fluxgate processing circuit, and a fluxgate sensor. A connecting half-button is located at the rear end of the frame. The quick-rotation structure assembly includes a shaft, a quick-rotation nut, and a helical damper. The upper end of the shaft is connected to the helical damper, and the helical damper is connected to the half-button adapter. The lower end of the shaft is fitted with a quick-rotation nut, which is threaded into the probe housing. When the quick-rotation nut is screwed on, it pushes the shoulder of the shaft to drive the probe frame assembly to move linearly within the probe housing.

[0007] Furthermore, an anti-rotation ring is fixedly installed on the inner wall of the drill collar, and a guide key is provided on the anti-rotation ring. The flow channel connector assembly includes a flow channel connector body, which is provided with a keyway. The guide key and the keyway cooperate to form an interlocking structure, thereby achieving circumferential fixation of the probe assembly inside the drill collar.

[0008] Furthermore, the flow channel connector assembly also includes a flow channel connector transition piece that is inserted and mated with the flow channel connector body. A locking nut is provided at the end of the flow channel connector assembly away from the probe assembly. The locking nut is threadedly connected to the inner wall of the drill collar and is used to press the flow channel connector body and achieve axial fixation of the probe assembly inside the drill collar.

[0009] Furthermore, a grounding bead assembly is installed on the outer peripheral wall of the flow channel connector body. The grounding bead assembly is used to achieve vibration reduction and reliable electrical grounding of the flow channel connector assembly.

[0010] Furthermore, the fast-rotating structure assembly also includes a gyroscope circuit board fixedly mounted on the semi-adjustable adapter and a gyroscope cover for pressing the gyroscope circuit board. The gyroscope circuit board is a single-axis MEMS gyroscope used to measure the drill rod rotation speed in environments with magnetic interference.

[0011] Furthermore, the half-button adapter is also equipped with an MDM15 female plug, and the connecting half-button is also equipped with an MDM15 male plug for electrical connection by mating with the MDM15 female plug.

[0012] Furthermore, the quick-turn assembly also includes a washer and a fastening screw. The washer is fitted onto the end of the shaft and locked by the fastening screw to limit its axial displacement when the quick-turn nut is engaged.

[0013] Furthermore, a surge protection circuit is connected between the probe skeleton assembly and the flow channel connector assembly. The surge protection circuit is electrically connected to the main control power circuit board to prevent transient voltage from damaging the circuit.

[0014] Furthermore, the probe assembly also includes multiple centralizers axially spaced around the outer periphery of the probe housing. The centralizers contact the inner wall of the drill collar and are used to support the probe assembly.

[0015] Furthermore, multiple damping O-rings are axially spaced around the outer periphery of the probe skeleton assembly. These damping O-rings are in elastic contact with the inner wall of the probe housing to achieve radial damping of the probe skeleton assembly. A locking nut and a locking O-ring are provided at one end of the probe housing near the flow channel connector assembly. The locking O-ring is fitted onto the end of the probe skeleton assembly. By tightening the screw on the locking nut, it is screwed to the end of the probe skeleton assembly, causing the locking O-ring to bulge under the pressure of the locking nut and come into contact with the probe housing. This achieves locking and damping of the left end of the probe skeleton assembly inside the probe housing.

[0016] Compared with the prior art, the high-precision dynamic continuous inclinometer of the present invention has the following significant advantages:

[0017] 1) Advantages in structural reliability and lifespan: The unique fast-rotation structure ensures that the probe frame with interference-fit damping O-rings does not rotate during assembly, preventing damage to the O-rings from tangential friction, while protecting the helical damper from torsional torque, greatly improving component lifespan; the radial damping O-ring assembly, axial helical damper, and grounding bead assembly form an elastic structure to provide all-round damping protection; the anti-rotation ring and keyway achieve circumferential fixation, and the locking nut achieves axial fixation, ensuring the instrument's stable position within the drill collar; the surge protection circuit protects sensitive electronic components from transient voltage damage.

[0018] 2) Measurement accuracy advantages: Seven-axis sensor fusion: a three-axis high-precision quartz flexible accelerometer (high accuracy and good stability), a three-axis fluxgate magnetometer, and a single-axis MEMS gyroscope, to achieve sensor redundancy and complementarity, effectively suppress downhole broadband vibration noise, and improve the signal-to-noise ratio; the MEMS gyroscope is used to accurately measure the drill pipe rotation speed, and the accelerometer is scaled and phase compensated to eliminate dynamic errors caused by rotational motion; the MEMS gyroscope provides independent rotation speed measurement in magnetic interference environments, ensuring the accuracy of azimuth angle calculation.

[0019] 3) On-site maintainability advantages: Modular design (probe skeleton assembly and quick-rotation structure assembly are connected by half-fastening), which facilitates on-site disassembly, testing and maintenance replacement; quick-rotation structure simplifies the assembly process, requires no special tools, and reduces the difficulty of on-site operation.

[0020] In summary, this invention solves the problems of weak anti-interference ability, complex structure, assembly damage and insufficient reliability in existing dynamic measurement technologies, and realizes uninterrupted, high-precision and high-reliability wellbore trajectory measurement during drilling. Attached Figure Description

[0021] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0022] Figure 1 This is a schematic diagram of the structure of a high-precision dynamic continuous inclinometer while drilling according to an embodiment of the present invention;

[0023] Figure 2 for Figure 1 A three-dimensional structural schematic diagram of the probe frame assembly shown;

[0024] Figure 3 for Figure 1A cross-sectional schematic diagram of the probe frame assembly shown;

[0025] Figure 4 for Figure 1 A three-dimensional structural schematic diagram of the fast-rotating structure assembly shown;

[0026] Figure 5 for Figure 4 The diagram shows a front view of the fast-rotating structure assembly.

[0027] Figure 6 for Figure 5 The cross-sectional view shown is along the AA direction;

[0028] Figure 7 for Figure 5 The cross-sectional view shown is along the BB direction;

[0029] Figure 8 for Figure 6 The diagram shown is along direction C.

[0030] Figure 9 for Figure 1 The schematic front sectional view of the flow channel connector assembly shown;

[0031] Figure 10 for Figure 1 The diagram shows a front sectional view of the hard-connection assembly.

[0032] Figure 11 This is a flowchart of the signal processing of a high-precision dynamic continuous inclinometer while drilling according to an embodiment of the present invention.

[0033] Among them, 1-shaft; 2-quick-turn nut; 3-washer; 4-fastening screw; 5-probe housing; 6-locking nut; 7-locking O-ring; 9-main control power circuit board; 10-acquisition circuit board; 11-quartz flexible accelerometer; 12-magnetic fluxgate processing circuit; 13-magnetic fluxgate sensor; 14-MDM15 male connector; 15-connecting half-thread; 16-surge protection circuit; 17-drill collar; 18-anti-rotation ring; 19-locking nut; 20-spiral damper; 21-first screw; 22-gyroscope cover; 23-gyroscope circuit board; 24-MDM15 female connector; 25-half-thread adapter; 26-copper nut; 27-second screw; 2 8-Third screw; 29-First single-core male pin; 30-First sealing O-ring; 31-First retaining ring; 32-Positioning pin; 33-Center; 34-Grounding plate; 35-Fourth screw; 36-Flow channel connector body; 37-Flow channel connector transition piece; 38-Single-core female pin; 39-Second single-core male pin; 40-Grounding bead assembly; 41-Second sealing O-ring; 42-Third sealing O-ring; 43-Second retaining ring; 44-Grantment; 47-Rigid connection connector; 48-Shock-damping O-ring assembly; 100-Probe skeleton assembly; 200-Quick-rotation structure assembly; 300-Flow channel connector assembly; 400-Rigid connection assembly; 500-Rigid connection connector assembly. Detailed Implementation

[0034] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0035] Figure 1 The structure of a high-precision dynamic continuous inclinometer 1000 for drilling, according to an embodiment of the present invention, is shown. For example... Figure 1 As shown, the high-precision dynamic continuous inclinometer 1000 for drilling may include: a drill collar 17, which is an integral structure without grooves, through holes, or gun holes; a flow channel connector assembly 300, a probe assembly, and a rigid connection assembly 400, which are sequentially arranged and connected within the drill collar 17 (see details). Figure 10 As shown), the flow channel connector assembly 300 is used to achieve the flow channel transition, electrical connection transition, and axial support and positioning of the probe assembly between the internal flow channel of the drill collar 17 and the probe assembly; the rigid connection assembly 400 is used to achieve the mechanical rigid connection and electrical connection between the probe assembly and the lower instrument; the rigid connection assembly 400 is connected to the probe assembly through the rigid connection connector assembly 500. Among these, combined with... Figure 2 and Figure 4As shown, the probe assembly may include a probe housing 5 connected between the flow channel connector assembly 300 and the rigid connection assembly 400, a probe skeleton assembly 100 and a quick-turn structure assembly 200 sequentially disposed within the probe housing 5, and connected to the probe skeleton assembly 100 via a semi-fastening structure. The semi-fastening structure includes a connecting semi-fastening 15 disposed at the rear end of the probe skeleton assembly 100 and a semi-fastening adapter 25 disposed at the front end of the quick-turn structure assembly 200. Wherein, as... Figure 2 As shown, the probe frame assembly 100 may include a frame, a main control power circuit board 9 fixedly mounted on the frame, a data acquisition circuit board 10, three quartz flexible accelerometers 11 arranged orthogonally in pairs, a fluxgate sensor 13, and a fluxgate processing circuit 12, with a connecting half-button 15 located at the rear end of the frame. Figures 4 to 8 As shown, the quick-rotation structure assembly 200 may include a shaft 1, a quick-rotation nut 2, and a helical damper 20. The upper end of the shaft 1 is connected to the helical damper 20, and the helical damper 20 is connected to the half-lock adapter 25. The lower end of the shaft 1 is fitted with the quick-rotation nut 2, which is threadedly engaged with the probe housing 5. When the quick-rotation nut 2 is screwed on, it pushes the shoulder of the shaft 1 to drive the probe frame assembly 100 to make linear motion within the probe housing 5.

[0036] In the assembly stage of the high-precision dynamic continuous inclinometer 1000 for drilling according to this embodiment of the invention, the probe frame assembly 100 and the quick-rotation structure assembly 200 are first connected by a half-locking structure, wherein the connecting half-lock 15 and the half-locking adapter 25 are engaged, and the MDM15 male plug 14 mentioned later (e.g.) Figure 2 (as shown) and MDM15 female connector 24 (as shown) Figure 5 (As shown) Synchronous docking enables simultaneous mechanical and electrical connection. Then, the assembled probe frame assembly 100 and quick-rotation structure assembly 200 are installed into the probe housing 5. At this point, the quick-rotation nut 2 is rotated to engage with the internal thread of the probe housing 5. As the quick-rotation nut 2 rotates, it pushes the shoulder of shaft 1, converting rotational motion into linear motion, driving the probe frame assembly 100 smoothly forward in a straight line within the probe housing 5 until it reaches the predetermined position. Finally, the position of the quick-rotation nut 2 is locked. After assembly, the probe assembly is installed into the drill collar 17 and sequentially connected to the flow channel connector assembly 300 and the rigid connection assembly 400 to form a complete measurement system. During drilling, the triaxial quartz flexible accelerometer 11 and the triaxial fluxgate sensor 13 measure the gravitational field and geomagnetic field components in real time. The data is acquired by the acquisition circuit board 10 and processed by the main control power circuit board 9 to calculate the well inclination angle and azimuth angle in real time.

[0037] The high-precision dynamic continuous inclinometer 1000 for drilling in this embodiment of the invention forms a complete measurement-while-drilling system by sequentially arranging the flow channel connector assembly 300, the probe assembly, and the rigid connection assembly 400 within the drill collar 17. This system is compact, has high space utilization, and is suitable for limited downhole spaces. It employs three pairwise orthogonal triaxial quartz flexural accelerometers 11 and a triaxial fluxgate sensor 13 to achieve precise measurement of the triaxial gravity field and geomagnetic field, laying the foundation for high-precision attitude calculation. The quick-turn nut 2, threaded into the probe housing 5, converts rotational motion into linear motion, ensuring that the probe skeleton assembly 100 remains non-rotating when installed in the probe housing 5. This completely avoids the problem of twisting and tearing of the damping O-ring due to tangential friction in traditional rotary assembly, while also protecting the helical damper 20 from torsional torque damage, greatly improving assembly quality and component lifespan. During assembly, the probe frame assembly 100 does not rotate, ensuring that the helical vibration damper 20 only bears axial compressive force and not torsional torque, significantly improving its lifespan and reliability. Furthermore, the probe frame assembly 100 and the quick-rotation structure assembly 200 are quickly connected via a semi-locking structure, simplifying assembly, ensuring accurate positioning, and facilitating simultaneous mechanical and electrical integration. This also aids in on-site disassembly and maintenance. The modular design of the semi-locking structure enhances system interchangeability and facilitates module testing and fault location.

[0038] In such Figure 1 In the preferred embodiment shown, an anti-rotation ring 18 can be fixedly installed on the inner wall of the drill collar 17. The anti-rotation ring 18 is provided with a guide key, which, in conjunction with... Figure 9 As shown, the flow channel connector assembly 300 may include a flow channel connector body 36, which is provided with a keyway. The guide key and the keyway cooperate to form an interlocking structure, thereby achieving circumferential fixation of the probe assembly within the drill collar 17. In this embodiment, the interlocking cooperation of the guide key and the keyway ensures that the probe assembly cannot rotate within the drill collar 17, guaranteeing the consistency between the measurement coordinate system and the drill string coordinate system, and avoiding measurement errors caused by instrument rotation. Furthermore, this embodiment eliminates the need for complex anti-rotation grooves on the drill collar 17; circumferential fixation is achieved solely through the internal anti-rotation ring 18, without affecting the strength and sealing performance of the drill collar.

[0039] Preferably, the anti-rotation ring 18 and the drill collar 17 are interference fit, and the anti-rotation ring 18 can be installed into the drill collar 17 after being cooled by liquid nitrogen.

[0040] In such Figure 1 and Figure 9In the preferred embodiment shown, the flow channel connector assembly 300 may further include a flow channel connector transition piece 37 that inserts into the flow channel connector body 36. A locking nut 19 may be provided at the end of the flow channel connector assembly 300 furthest from the probe assembly. The locking nut 19 is threadedly connected to the inner wall of the drill collar 17, used to press the flow channel connector body 36 and axially fix the probe assembly within the drill collar 17. In this embodiment, the locking nut 19 presses the flow channel connector body 36 through a threaded connection, achieving axial fixation of the probe assembly within the drill collar and preventing downhole vibration from causing axial displacement of the instrument. The insertion and engagement of the flow channel connector body 36 and the transition piece facilitates manufacturing and assembly adjustments. The combination of circumferential fixation (anti-rotation ring 18) and axial fixation (locking nut 19) ensures the stability of the instrument's position within the drill collar and improves measurement reliability.

[0041] In such Figure 9 In the preferred embodiment shown, a grounding bead assembly 40 can be installed on the outer peripheral wall of the flow channel connector body 36. The grounding bead assembly 40 is used to achieve vibration damping and electrical grounding of the flow channel connector assembly 300. In this embodiment, the grounding bead assembly 40 simultaneously achieves the dual functions of vibration damping and grounding, simplifying the structural design and saving space. The grounding bead assembly 40 enables reliable grounding of the instrument bus return current, avoiding ground loop interference and improving signal quality. The elastic structure of the grounding bead assembly can absorb some vibration energy, in conjunction with the vibration damping O-ring group 48 mentioned later (such as...). Figure 1 As shown, this forms multiple layers of shock absorption protection.

[0042] Preferably, such as Figure 9 As shown, a second sealing O-ring 41 can be respectively provided on the outer peripheral wall of the flow channel connector body 36 in the areas on both sides of the grounding bead assembly 40 to prevent downhole mud from entering the grounding bead assembly 40.

[0043] In such Figure 5 and Figure 6 In the preferred embodiment shown, the fast-rotating structure assembly 200 may further include a gyroscope circuit board 23 fixedly mounted on the semi-adjustable connector 25 and a gyroscope cover 22 for pressing the gyroscope circuit board 23. The gyroscope circuit board 23 may be a single-axis MEMS gyroscope used to measure drill pipe rotation speed in environments with magnetic interference. In this embodiment, the single-axis MEMS gyroscope is not affected by electromagnetic field interference and can accurately measure drill pipe rotation speed in complex electromagnetic environments downhole, compensating for the shortcomings of fluxgate velocimetry. Together with the three-axis quartz flexural accelerometer 11 and the three-axis fluxgate sensor 13, it constitutes a seven-axis measurement system, achieving sensor redundancy and complementarity, and improving system reliability and measurement accuracy. The gyroscope circuit board 23 is fixed on the semi-adjustable connector 25 and pressed tightly by the gyroscope cover, ensuring a firm installation and good shock resistance.

[0044] In such Figure 5In the preferred embodiment shown, an MDM15 female plug 24 may also be installed on the half-button adapter 25, such as... Figure 2 As shown, the connecting half-button 15 is also equipped with an MDM15 male plug 14 for electrical connection with the MDM15 female plug 24. The MDM series plugs are high-reliability military connectors with good shock resistance and low contact resistance, suitable for downhole vibration environments. The half-button structure achieves electrical connection through simultaneous mating, resulting in high assembly efficiency and avoiding the cumbersome and error-prone process of separate wiring. The probe frame assembly 100 and the quick-rotation structure assembly 200 can be independently tested and assembled, facilitating troubleshooting and maintenance / replacement.

[0045] In such Figure 6 and Figure 8 In the preferred embodiment shown, the quick-rotor assembly 200 may further include a washer 3 and a fastening screw 4. The washer 3 is fitted onto the end of the shaft 1 and locked by the fastening screw 4, used to limit the axial displacement of the quick-rotor nut 2 when it is screwed on. During use, the fastening screw 4 on the washer 3 should be loosened appropriately, but not fall off, to ensure that the quick-rotor nut 2 can rotate relative to the shaft 1. In this embodiment, the washer 3 limits the axial displacement range of the quick-rotor nut 2 on the shaft, ensuring that the quick-rotor nut 2 effectively pushes the shoulder of the shaft 1 when it rotates. After assembly, tighten the fastening screw 4 to lock the quick-rotor nut 2 onto the shaft 1, preventing loosening during subsequent use. The washer and screw limiting method has a simple structure, is easy to process, and has high reliability.

[0046] In such Figure 1 In the preferred embodiment shown, a surge protection circuit 16 may be connected between the probe frame assembly 100 and the flow channel connector assembly 300. The surge protection circuit 16 is electrically connected to the main control power circuit board 9 and is used to prevent transient voltage damage to the circuit. The surge protection circuit can absorb transient high voltage spikes generated by downhole equipment startup, lightning induction, etc., protect sensitive electronic components, effectively prevent circuit damage caused by accidental voltage surges, and extend the service life of the instrument. Its placement between the probe frame assembly 100 and the flow channel connector assembly 300, close to the power input terminal, provides the best protection effect.

[0047] In such Figure 1 In the preferred embodiment shown, the probe assembly may further include a plurality of centralizers 33 axially spaced around the outer periphery of the probe housing 5. The centralizers 33 contact the inner wall of the drill collar 17 and support the probe assembly. The contact between the centralizers 33 and the inner wall of the drill collar 17 provides radial support to the probe assembly, ensuring that the probe assembly is centered within the drill collar 17. The elastic structure of the centralizers 33 can absorb some radial vibrations, forming multiple layers of protection with the internal damping structure. The axially spaced centralizers 33 provide multi-point support, improving the stability of the probe assembly.

[0048] In such Figure 1In the preferred embodiment shown, a plurality of damping O-ring assemblies 48 are axially spaced around the outer periphery of the probe skeleton assembly 100. These damping O-ring assemblies 48 elastically contact the inner wall of the probe housing 5, providing radial damping for the probe skeleton assembly 100. The elastic contact between the damping O-ring assemblies and the inner wall of the probe housing absorbs radial vibration energy, protecting the internal sensors and circuit boards. The axially spaced multiple damping O-ring assemblies form multi-point elastic support, improving vibration resistance. Combined with the quick-rotation structure assembly 200, this ensures that the damping O-ring assemblies are not damaged by tangential friction during assembly, maintaining their original elastic properties. The damping O-rings also have an auxiliary sealing function, preventing mud and impurities from entering the probe.

[0049] Furthermore, in such Figure 1 and Figure 3 In the preferred embodiment shown, a locking nut 6 and a locking O-ring 7 may be provided at one end of the probe housing 5 near the flow channel connector assembly 300. The locking O-ring 7 is sleeved on the end of the probe skeleton assembly 100. By tightening the screw on the locking nut 6, it is made to be screwed to the end of the probe skeleton assembly 100, so that the locking O-ring 7 protrudes under the compression of the locking nut 6 and comes into contact with the probe housing 5, thereby realizing the locking and shock absorption of the left end of the probe skeleton assembly 100 inside the probe housing 5.

[0050] When the high-precision dynamic continuous inclinometer 1000 for drilling in this embodiment of the invention is working, it first forms the internal core component by half-locking the quick-rotation structure assembly 200 and the probe frame assembly 100. The rotational motion is converted into linear motion by the threaded engagement of the quick-rotation nut 2 and the probe housing 5, allowing the probe frame assembly 100 to be installed linearly into the probe housing 5 without rotation, thus avoiding rotational friction from the damping elements. Then, the assembled probe assembly is installed into the drill collar 17, with the keyway of the flow channel connector assembly 300 engaging with the guide key of the anti-rotation ring 18 fixed to the inner wall of the drill collar 17 to achieve circumferential fixation. Finally, the flow channel connector assembly 300 is screwed into the rigid connection assembly by the threaded engagement of the locking nut 19. The probe assembly is axially fixed between the flow channel connector assembly 300 and the rigid connection assembly 400 by a 400-degree clamping mechanism. During operation, three orthogonal quartz flexible accelerometers 11 measure the gravitational acceleration component, the fluxgate sensor 13 measures the geomagnetic field component, and the single-axis MEMS gyroscope measures the drill pipe rotation speed. The seven-axis data is transmitted via the acquisition circuit board 10 to the main control power circuit board 9 for processing, achieving high-precision dynamic continuous measurement of well inclination, azimuth, and tool face. At the same time, the grounding bead assembly 40 provides vibration damping and electrical grounding, the surge protection circuit 16 protects the electrical system from transient voltage damage, and the centralizer 33 and the damping O-ring group 48 work together to attenuate downhole vibration and ensure measurement stability.

[0051] In such Figure 11In the preferred embodiment shown, the high-precision dynamic continuous inclination meter 1000 of this invention employs a combination of measurement and control technology using a three-axis accelerometer, a three-axis fluxgate magnetometer, and a single-axis MEMS gyroscope. Its signal processing flow is shown in the figure: First, 11 variables are simultaneously acquired, including the three-axis accelerometer measurements Gx, Gy, and Gz and their temperatures Tx, Ty, and Tz; the three-axis fluxgate magnetometer measurements Hx, Hy, and Hz and their temperature TH; and the circuit board temperature Tb. These multi-channel signals are converted by an AD converter and sent to a DSP. The DSP first performs dynamic filtering on the raw data to eliminate downhole vibration noise, then divides it by a scaling factor to convert it into standard physical quantities. When the instrument rotates, the gyroscope output Gyo is used to calculate the real-time drill pipe rotation speed, and the accelerometer is compensated for the scaling factor (to eliminate temperature effects) and the phase (to correct dynamic response errors) based on this rotation speed. Finally, based on the compensated acceleration and fluxgate magnetometer data, the dynamic well inclination angle and dynamic azimuth angle are calculated in real time, enabling high-precision continuous measurement without stopping drilling during the drilling process.

[0052] In this embodiment, comprehensive sensor data is acquired by collecting 11 variables, providing a complete data foundation for subsequent high-precision calculations. Acquiring accelerometer temperature, fluxgate temperature, and circuit board temperature allows for temperature drift compensation in subsequent processing, eliminating the impact of downhole temperature variations on measurement accuracy. The DSP performs dynamic filtering on the raw data, effectively suppressing broadband vibration noise during drilling and improving the signal-to-noise ratio. Dividing the raw data by a scaling factor converts it into standard physical quantities, eliminating individual sensor differences and ensuring measurement consistency. MEMS gyroscopes are used to accurately measure drill pipe rotation speed, and scaling factor and phase compensation are applied to the accelerometer to eliminate dynamic errors such as centrifugal force and Coriolis force generated by rotational motion. Based on the compensated data, wellbore inclination and azimuth are calculated in real time, meeting the data update rate requirements of continuous dynamic measurement while drilling and providing real-time parameters for closed-loop trajectory control.

[0053] Compared with existing technologies, the high-precision dynamic continuous directional drilling instrument 1000 of this invention solves the technical problems of traditional directional drilling instruments, such as complex drill collar structure, easy rotation of probe tube, severe wear during installation, and weak anti-magnetic interference capability, through innovative grooveless drill collar structure, guide key-keyway anti-rotation structure, fast-rotation linear loading mechanism, and seven-axis sensor configuration. It realizes reliable three-dimensional fixation of probe tube assembly inside drill collar 17, wear-free and quick installation, and high-precision dynamic continuous measurement in complex environments, which significantly improves the reliability, service life and measurement accuracy of the equipment. It is particularly suitable for harsh drilling environments with high temperature, high pressure, strong vibration and magnetic interference.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A high-precision dynamic continuous inclinometer while drilling, characterized in that, include: The system comprises a drill collar, a flow channel connector assembly, a probe assembly, and a rigid connection assembly, sequentially arranged within the drill collar and connected in sequence. The probe assembly includes a probe housing connected between the flow channel connector assembly and the rigid connection assembly, a probe skeleton assembly sequentially arranged within the probe housing, and a quick-turn structure assembly connected to the probe skeleton assembly via a half-locking structure. The half-locking structure includes a connecting half-lock located at the rear end of the probe skeleton assembly and a half-locking adapter located at the front end of the quick-turning structure assembly. The probe frame assembly includes a frame, a main control power circuit board fixedly mounted on the frame, a data acquisition circuit board, three quartz flexible accelerometers arranged orthogonally in pairs, a fluxgate sensor, and a fluxgate processing circuit. The connecting half-fastener is located at the rear end of the frame. The quick-rotation assembly includes a shaft, a quick-rotation nut, and a helical damper. The upper end of the shaft is connected to the helical damper, and the helical damper is connected to the half-lock adapter. The lower end of the shaft is fitted with the quick-rotation nut, which is threaded into the probe housing. When the quick-rotation nut is screwed on, it pushes the shoulder of the shaft to drive the probe frame assembly to move linearly within the probe housing. The drill collar is equipped with an anti-rotation ring fixedly installed on its inner wall. The anti-rotation ring is provided with a guide key. The flow channel connector assembly includes a flow channel connector body, which is provided with a keyway. The guide key and the keyway cooperate to form an interlocking structure, thereby achieving circumferential fixation of the probe assembly within the drill collar. The flow channel connector assembly also includes a flow channel connector transition piece that is inserted into and mates with the flow channel connector body. A locking nut is provided at the end of the flow channel connector assembly away from the probe assembly. The locking nut is threadedly connected to the inner wall of the drill collar and is used to press the flow channel connector body and achieve axial fixation of the probe assembly within the drill collar. Multiple damping O-rings are axially spaced around the outer periphery of the probe skeleton assembly. These damping O-rings elastically contact the inner wall of the probe housing to achieve radial damping of the probe skeleton assembly. A locking nut and a locking O-ring are provided at one end of the probe housing near the flow channel connector assembly. The locking O-ring is fitted onto the end of the probe skeleton assembly. By tightening the screw on the locking nut, the O-ring is made to bulge under the pressure of the locking nut and come into contact with the probe housing, thus achieving locking and damping of the left end of the probe skeleton assembly within the probe housing.

2. The high-precision dynamic continuous inclinometer while drilling according to claim 1, characterized in that, A grounding bead assembly is installed on the outer peripheral wall of the flow channel connector body. The grounding bead assembly is used to achieve vibration reduction and electrical grounding of the flow channel connector assembly.

3. The high-precision dynamic continuous surveying instrument for drilling as described in claim 1 or 2, characterized in that, The fast-rotating structure assembly also includes a gyroscope circuit board fixedly mounted on the semi-adjustable connector and a gyroscope cover for pressing the gyroscope circuit board. The gyroscope circuit board is a single-axis MEMS gyroscope used to measure the drill rod rotation speed in environments with magnetic interference.

4. The high-precision dynamic continuous inclinometer while drilling according to claim 3, characterized in that, The half-button adapter is also equipped with an MDM15 female plug, and the connecting half-button is also equipped with an MDM15 male plug for electrical connection by interlocking with the MDM15 female plug.

5. The high-precision dynamic continuous inclinometer while drilling according to claim 3, characterized in that, The quick-rotor assembly also includes a washer and a fastening screw. The washer is fitted onto the end of the shaft and locked by the fastening screw to limit its axial displacement when the quick-rotor nut is engaged.

6. The high-precision dynamic continuous inclinometer while drilling according to claim 1 or 2, characterized in that, A surge protection circuit is connected between the probe skeleton assembly and the flow channel connector assembly. The surge protection circuit is electrically connected to the main control power circuit board to prevent transient voltage from damaging the circuit.

7. The high-precision dynamic continuous inclinometer while drilling according to claim 1 or 2, characterized in that, The probe assembly also includes a plurality of centralizers axially spaced around the outer periphery of the probe housing. The centralizers contact the inner wall of the drill collar and are used to support the probe assembly.

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