A kind of oilfield measurement while drilling rotation calibration device and method

Abstract

This invention relates to the field of measurement while drilling (MWD) technology, specifically disclosing an oilfield MWD rotary calibration device and method. The device includes a fixed frame, and further comprises: a rotating cylinder for fixing a directional probe, the directional probe being coaxially disposed inside the rotating cylinder; a positioning mechanism for supporting the rotating cylinder, the rotating cylinder being rotatably disposed within the positioning mechanism; a rotary drive mechanism, connected to the rotating cylinder for driving the rotating cylinder to rotate around its own axis; a conductive slip ring, coaxially disposed on the outer wall of the rotating cylinder for connecting the signal cable of the directional probe; and an inclination adjustment mechanism for supporting and fixing the positioning mechanism and adjusting the inclination angle of the positioning mechanism. All components of the oilfield MWD rotary calibration device are made of non-magnetic materials. This invention can simulate the movement state of the directional probe during actual downhole operations and can calibrate the output signal of the directional probe at different inclination angles during rotation.

Description

Technical Field

[0001] This invention relates to the field of measurement while drilling technology, and specifically to a rotary calibration device and method for measurement while drilling in oilfields. Background Technology

[0002] In oilfield drilling, the Measurement While Drilling (MWD) system is an instrument for measuring the drilling trajectory of an oil well. The directional probe within the MWD system is one of the crucial measuring instruments for detecting information such as wellbore inclination and location. The directional probe contains a triaxial accelerometer consisting of three accelerometers with two orthogonal measurement directions, and also includes three fluxgate magnetometers with two orthogonal axes. Based on the gravitational acceleration and Earth's magnetic field data measured by the triaxial accelerometers and the three fluxgate magnetometers, the directional probe determines information such as wellbore inclination, azimuth, and tool face.

[0003] The triaxial accelerometer, as the core of the measurement system, has its own errors. These errors include non-orthogonal errors, scaling factor errors, and zero-point deviations. Therefore, the directional probe needs to be calibrated. The calibration results are used to correct various systematic errors in the sensors inside the directional probe, ensuring that it can output high-precision measurement data in the downhole operating environment.

[0004] CN217872761U, a calibration device for directional probes, also relates to the calibration of directional probes in a measurement-while-drilling system. The disclosed calibration device is made of magnetic material to eliminate magnetic interference and avoid affecting the accuracy of signal detection. CN217872761U simulates the state of the directional probe at three different inclination angles by calibrating three calibration surfaces. However, directional probes have varying inclination angles and are in a rotating state during downhole operations. CN217872761U cannot calibrate the different inclination angles and rotation states of the directional probe, and therefore cannot simulate the movement state of the directional probe during actual downhole operations.

[0005] CN114382462B, a rotating measurement test apparatus and method, discloses a method for mounting a rotating measurement unit onto a rotating shaft, where a rotating drive mechanism can drive the rotating measurement unit to rotate axially. It also discloses the use of an indexing plate and a locking plate to adjust the angle between the rotating shaft, the rotating measurement unit, and the horizontal line of the ground, enabling measurements under different well inclination angles. In CN114382462B, the rotating shaft is mounted on a support plate via a bearing seat, achieving relative rotation of the rotating shaft relative to the support. However, in a rotating system supported by bearings, radial runout occurs due to inherent bearing clearance, machining and assembly coaxiality errors, etc. Radial runout refers to the radial offset of the rotating shaft, which relies on bearing support, during rotation, causing the axial direction of the rotating shaft to be different from its stationary position. Therefore, the inclination angle of the simulated inclined well (the angle between the rotating measurement unit and the horizontal line of the ground) has errors during rotation. Summary of the Invention

[0006] The purpose of this invention is to provide an oilfield measurement-while-drilling (DWD) rotation calibration device and method that can simulate the motion state of the directional probe during actual downhole operations. It can not only calibrate the output signal of the directional probe at different inclination positions during the rotation process, but also correct the radial runout during the rotation process to ensure that the output of the directional probe during the rotation process is synchronized with the expected attitude.

[0007] This invention is achieved through the following technical solution: A rotary calibration device for oilfield measurement while drilling includes a fixed frame and further includes: A rotating cylinder is used to fix the directional probe, which is coaxially arranged inside the rotating cylinder; A positioning mechanism is used to support the rotating cylinder, which is rotatably mounted within the positioning mechanism via a first bearing; the first bearing supports the rotating cylinder and allows the rotating cylinder to rotate relative to the positioning mechanism. A rotary drive mechanism, connected to the rotary cylinder drive, is used to drive the rotary cylinder to rotate around its own axis; A conductive slip ring, coaxially mounted on the outer wall of the rotating cylinder, is used to connect the signal cable of the directional probe. The tilt adjustment mechanism is used to support the fixed positioning mechanism and adjust the tilt angle of the positioning mechanism. The correction unit is used to correct the radial runout during the rotation of the rotating cylinder. The correction unit includes a radial displacement sensor, a positioning sleeve, an adjustable clamping mechanism, a radial offset calculation module, and a controller. At least two radial displacement sensors are arranged along the axial direction of the rotating cylinder. The radial displacement sensors are used to collect the radial offset during the rotation of the rotating cylinder. The radial offset calculation module calculates the axial angle deviation of the rotating cylinder relative to the initial state based on the radial offset. Positioning sleeves are coaxially arranged at both ends of the rotating cylinder. The adjustable clamping mechanism includes at least two clamping members arranged symmetrically. The tilt angle of the directional probe is corrected by the radial extension and retraction of the clamping members. All components of the oilfield drilling measurement rotary calibration device are made of non-magnetic materials.

[0008] This invention achieves coaxial fixation of the directional probe through a rotating cylinder, ensuring that the directional probe and the rotating cylinder have the same posture. The posture of the directional probe can be adjusted by adjusting the posture of the rotating cylinder. The positioning mechanism and tilt adjustment mechanism allow the rotating cylinder to be mounted on the fixed frame without affecting its rotation. Furthermore, the tilt adjustment mechanism allows for adjustment of the tilt angle of the rotating cylinder (the angle between the central axis of the rotating cylinder and the horizontal direction). A rotation drive mechanism drives the rotating cylinder to rotate, thereby moving the directional probe to simulate the movement of the directional probe during downhole operations.

[0009] All components are made of non-magnetic materials, which avoids interference from magnetic materials on signal acquisition. The conductive slip ring of this invention is existing technology and mainly includes a rotor and a stator. The rotor is fixed to the outer wall of the rotating cylinder and rotates synchronously with the rotating cylinder. The rotor typically includes a spindle, conductive ring, insulating layer and bearing. The stator is fixed and has an internal brush device. The signal cable of the directional probe is connected to the rotor. The signal transmission process is as follows: the data exported from the signal cable of the directional probe is output sequentially through the rotor wire, conductive ring, brush and stator wire. The signal output of the directional probe can be obtained by acquiring the output of the conductive slip ring. Since the stator is fixed during the rotation of the directional probe, stable signal transmission (current, electrical signal and data) is achieved. The non-magnetic design avoids interference and ensures smooth and safe rotation.

[0010] The above-described structure of the present invention adjusts the tilt angle of the positioning mechanism through a tilt angle adjustment mechanism. Theoretically, the directional probe, rotating cylinder, and positioning mechanism remain coaxial regardless of whether they are in a static state or the rotating cylinder is in a rotating test state. The tilt angle of the directional probe adjusted by the tilt angle adjustment mechanism can accurately reflect the tilt angle of the directional probe in the rotating test state. However, in reality, since the rotating cylinder is rotatably mounted in the positioning mechanism through the first bearing, the rotating cylinder experiences radial runout during rotation, which in turn causes the directional probe, which is coaxially connected to it, to deviate axially from the static state, resulting in the inability to accurately simulate the tilt state of the directional probe.

[0011] This invention incorporates a correction unit that utilizes a radial displacement sensor to collect the radial runout (radial offset) of the rotating cylinder during rotation testing. A radial offset calculation module calculates the axial offset of the rotating cylinder relative to its stationary state during rotation testing based on the radial runout at different axial positions. The stationary axial position is defined as the tilt state of the directional probe during downhole operations. The controller, based on the calculation results from the radial offset calculation module, controls the clamping components in the clamping mechanisms at both ends of the rotating cylinder. Specifically, it corrects the tilt angle of the directional probe by controlling the radial extension and retraction of two symmetrically arranged clamping components, ensuring that the tilt angle of the directional probe matches the set value during rotation testing and avoiding simulated attitude errors caused by the radial runout of the rotating cylinder during rotation testing.

[0012] In summary, this invention can simulate the motion state of directional probes during actual downhole operations. It can not only calibrate the output signals of directional probes at different inclination angles during rotation, but also correct radial runout during rotation to ensure that the output of the directional probe during rotation is synchronized with the expected attitude.

[0013] In a preferred embodiment, the tilt adjustment mechanism includes a rotating shaft, a seated bearing, and a second motor. The seated bearing is mounted on a fixed frame, the rotating shaft is rotatably disposed within the seated bearing, and one end of the rotating shaft is fixedly connected to a positioning mechanism. The second motor is used to drive the rotating shaft to rotate. The rotating shaft is arranged perpendicularly to the rotating cylinder. In a preferred embodiment, a first rotary phase encoder is coaxially mounted on the outer wall of the rotating cylinder, and a second rotary phase encoder is coaxially mounted on the outer wall of the rotating shaft. The first and second rotary phase encoders are communicatively connected to the controller.

[0014] The first rotary phase encoder of the present invention is coaxially connected to the rotating cylinder and is used to output the actual circumferential phase of the rotating cylinder. The first rotary phase encoder can reflect the circumferential attitude of the rotating cylinder during rotation. The second rotary phase encoder is coaxially connected to the rotating shaft and is used to output the actual circumferential phase of the rotating shaft. The tilt angle of the rotating cylinder can be calculated by the actual circumferential phase output by the second rotary phase encoder. Compared with directly calculating the tilt angle of the rotating cylinder by the rotation angle of the second motor, it can avoid the tilt angle calculation error of the rotating cylinder caused by the error of the second motor and the transmission error of the connection between the second motor and the rotating shaft.

[0015] In a preferred embodiment, the positioning mechanism includes a housing that is cylindrical in shape, and a first bearing for supporting the rotating cylinder is disposed inside the housing.

[0016] In a preferred embodiment, the outer wall of the rotating cylinder protrudes radially outward to form an annular protrusion, and both ends of the annular protrusion form a first step that mates with the first bearing.

[0017] The first bearing is fixed to the inner wall of the outer casing. The present invention sets a first step, and the two first bearings are respectively installed at the two first steps. The first steps limit the axial displacement of the positioning mechanism to ensure the stability of the rotating cylinder installed in the positioning mechanism.

[0018] In a preferred embodiment, the outer wall of the housing is provided with a groove, and one end of the rotating shaft is provided with a connecting part, which is fixed in the groove.

[0019] The present invention enables a fixed connection between the rotating shaft and the outer casing.

[0020] In a preferred embodiment, the drive end of the rotary drive mechanism is connected to the housing via a connector.

[0021] The present invention enables the rotary drive mechanism and the outer shell to move synchronously through the connecting parts. When the positioning mechanism is adjusted to different tilt angles, the rotary drive mechanism and the outer shell move synchronously to ensure that the relative positional relationship between the rotary drive mechanism and the rotating cylinder does not change, thereby ensuring the rotary drive mechanism's control effect on the rotation of the rotating cylinder.

[0022] In a preferred embodiment, the connector includes a connecting plate, a fixed cylinder, and a second bearing. The fixed cylinder is disposed outside the power output shaft of the first motor of the rotary drive mechanism via the second bearing. The connecting plate is used to connect the housing and the fixed cylinder.

[0023] In a preferred embodiment, the positioning sleeve includes a sleeve coaxially fixed to the outer wall of the rotating cylinder, and one end of the sleeve is provided with an annular protrusion for mounting an adjustable clamping mechanism.

[0024] In a preferred embodiment, the clamping element includes a telescopic element and an arc-shaped clamping plate, the telescopic end of the telescopic element being connected to the outer wall of the arc-shaped clamping plate, and the arc-shaped clamping plate cooperating with the directional probe.

[0025] In a preferred embodiment, a protective cover is also provided on the outside of the rotary drive mechanism.

[0026] The above-described configuration of the present invention helps to protect the rotary drive mechanism and ensure the stability of the transmission drive.

[0027] In a preferred embodiment, a dial is fixed on the rotating shaft.

[0028] The dial provided in this invention facilitates intuitive observation of the tilt angle of the directional probe.

[0029] In a preferred embodiment, the bottom of the fixed frame is provided with telescopic wheels and support legs, or the bottom of the fixed frame is provided with locking casters.

[0030] The above-described configuration of the present invention facilitates the movement of various calibration devices.

[0031] In a preferred embodiment, a control box for automatically controlling the oilfield drilling measurement rotary calibration device is mounted on the mounting frame.

[0032] A method for using a rotary calibration device for oilfield measurement while drilling includes the following steps: S1. Coaxially install the directional probe inside the rotating cylinder; S2. Adjust the tilt angle of the rotating cylinder through the tilt angle adjustment mechanism so that the rotating cylinder forms an angle of 0-90° with the horizontal direction, and record the initial tilt angle V0 of the rotating cylinder. S3. Drive the rotary drive mechanism to make the rotating cylinder rotate 360° around its own axis. During the rotation, the radial displacement sensor collects the radial offset of the rotating cylinder. The radial offset calculation module calculates the axial angle deviation V of the rotating cylinder relative to the initial tilt angle V0 based on the radial offset. p ; S4. The rotating cylinder stops rotating and returns to the initial circumferential position. The controller uses the adjustable clamping mechanism to radially extend and retract to correct the inclination angle of the directional probe based on the axial angle deviation. S5. Drive the rotary drive mechanism to make the rotating cylinder rotate 360° around its own axis, and calculate the axial angle deviation V. p Repeat steps S3-S5 until V rotates. p The value is zero to ensure that the tilt rotation process of the directional probe is consistent with the initial state; S6. During the rotation process, the difference between the data output of the directional probe and the standard data output is determined by collecting the signal exported by the conductive slip ring, so as to perform the calibration process of the directional probe; By adjusting the tilt angle of the rotating drum through operation step S2, the rotation of the directional probe at different tilt angles can be simulated.

[0033] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. This invention utilizes a rotating cylinder, a positioning mechanism, and an inclination adjustment mechanism, which work together. The rotating cylinder and positioning mechanism rotate relative to each other, while the inclination adjustment mechanism supports and fixes the positioning mechanism and adjusts the inclination angle of the rotating cylinder. This enables the installation of the directional probe and allows the directional probe to rotate around its own axis at different inclination angles. The conductive slip ring ensures stable signal output from the directional probe during rotation. The non-magnetic design avoids interference and ensures smooth and safe rotation. In other words, this invention can simulate the movement state of the directional probe during actual downhole operations and can achieve signal output from the directional probe at different inclination angles during rotation. The output signal is used for calibration. This invention uses a correction unit to collect the radial offset of the rotating cylinder during the rotation test using a radial displacement sensor. The radial offset calculation module calculates the axial offset of the rotating cylinder in a relatively stationary state during the rotation test based on the radial runout of the rotating cylinder at different axial positions. The controller controls the clamping parts in the clamping mechanism at both ends of the rotating cylinder based on the calculation results of the radial offset calculation module. Specifically, the tilt angle of the directional probe is corrected by controlling the radial extension and retraction of the two symmetrically arranged clamping parts, so as to ensure that the tilt angle of the directional probe is consistent with the set value during the rotation test and avoid the simulated attitude error caused by the radial runout of the rotating cylinder during the rotation test.

[0034] 2. The present invention achieves the connection between the rotary drive mechanism and the outer shell through the set connecting parts, and the rotary drive mechanism and the outer shell move synchronously to ensure that the relative positional relationship between the rotary drive mechanism and the rotating cylinder does not change, thereby ensuring the rotary drive mechanism's control effect on the rotation of the rotating cylinder. Attached Figure Description

[0035] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the oilfield drilling measurement rotary calibration device of the present invention; Figure 2 for Figure 1 The right view; Figure 3 This is a top view showing the connection between the tilt adjustment mechanism and the positioning mechanism of the present invention; Figure 4 for Figure 3 Sectional view along the BB direction; Figure 5 This is a schematic diagram of the structure of the rotating cylinder of the present invention; Figure 6 for Figure 5 A magnified view of a section at point A in the middle; Figure 7 This is a schematic diagram showing the connection between the outer shell and the rotating cylinder of the present invention; Figure 8This is a schematic diagram of the rotating cylinder of the present invention in a stationary state; Figure 9 This is a schematic diagram showing the radial runout of a rotating cylinder during rotation. Figure 10 for Figure 1 A magnified view of a section at point C.

[0036] The attached diagram shows the markings and corresponding component names: 1-Fixed frame; 2-Positioning mechanism; 3-Conductive slip ring; 4-Rotating cylinder; 5-Tilting angle adjustment mechanism; 6-Protective cover; 7-Rotation drive mechanism; 8-Positioning sleeve; 9-Adjustable clamping mechanism; 10-Connecting piece; 11- Telescopic wheels; 12-Outriggers; 13-Crossbar; 21-Outer casing; 22-First bearing; 211-Groove; 41-Annular protrusion; 42-First step; 43-Second step; 51-Shaft; 52-Bearing with seat; 53-Connecting part; 54-Digital dial; 71-Driven pulley; 72-Belt; 73-Drive pulley; 74-First motor; 81-Sleeve; 82-Annular protrusion; 91-Telescopic component; 92-Arc-shaped clamp; 101-Connecting plate; 102-Fixing cylinder; 103-Second bearing; 100 - Directional probe; 200 - Control box; 300 - First rotary phase encoder; 400 - Second rotary phase encoder; 500 - Radial displacement sensor; 600 - First detection section; 700 - Second detection section. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. The illustrative embodiments and descriptions of this invention are for illustrative purposes only and are not intended to limit the invention. The embodiments described below are some, but not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0038] In the following description, numerous specific details are set forth to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that these specific details are not necessary to practice the invention. In other embodiments, well-known structures, materials, or methods are not specifically described to avoid obscuring the invention. Unless otherwise specified, the materials, instruments, and reagents used in the following embodiments are commercially available. Unless otherwise specified, the techniques used in the embodiments are conventional methods well known to those skilled in the art.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0040] Example 1: like Figures 1-9 As shown, an oilfield measurement-while-drilling (MWD) rotary calibration device includes a fixed frame 1, which can be any support bracket. In this embodiment, the inclination angle of the directional probe 100 needs to be adjusted. Therefore, as... Figure 1 , Figure 2 As shown, the top of the fixed frame 1 is provided with two crossbars 13 arranged in a stacked manner, and the space between the two crossbars 13 can meet the tilt angle adjustment of the directional probe 100. In a preferred embodiment, in order to facilitate the movement of the oilfield drilling measurement rotation calibration device, telescopic wheels 11 and support legs 12 are provided at the bottom of the fixed frame 1. The telescopic wheels 11 are existing technology, and the height of the rollers is adjustable. When it is necessary to move the fixed frame 1, the telescopic wheels 11 are extended so that the rollers contact the ground. At this time, the support legs 12 are away from the ground; or the bottom of the fixed frame 1 is provided with locking moving rollers.

[0041] The oilfield drilling measurement-while-drilling rotary calibration device in this embodiment also includes: Rotating cylinder 4 is used to fix directional probe 100, which is coaxially arranged inside rotating cylinder 4.

[0042] The positioning mechanism 2 is used to support the rotating cylinder 4, which is rotatably disposed within the positioning mechanism 2. Specifically, the positioning mechanism 2 includes a housing 21, which has a cylindrical shape to facilitate the coaxial installation of the rotating cylinder 4. A first bearing 22 for supporting the rotating cylinder 4 is provided inside the housing 21. In this embodiment, the first bearing 22 is provided at both ends inside the housing 21, and the rotating cylinder 4 is rotated relative to the housing 21 through the first bearing 22.

[0043] In a preferred embodiment, in order to avoid relative displacement between the rotating cylinder 4 and the outer casing 21 in the axial direction, the outer wall of the rotating cylinder 4 protrudes outward in the radial direction to form an annular protrusion 41. Both ends of the annular protrusion 41 are formed with a first step 42 that cooperates with the first bearing 22. The first bearing 22 blocks the annular protrusion 41, thus preventing the rotating cylinder 4 from making axial displacement within the outer casing.

[0044] A rotary drive mechanism, connected to the rotating cylinder 4, drives the rotating cylinder 4 to rotate around its own axis. The rotary drive mechanism can be any existing technology. In one specific example, the rotary drive mechanism includes a driven wheel 71, a belt 72, a driving wheel 73, and a first motor 74. The driven wheel 71 is coaxially mounted on the outer wall of one end of the rotating cylinder 4. The driven wheel 71 is connected to the driving wheel 73 via the belt 72. The driving wheel 73 is fixed on the power output shaft of the first motor 74. Preferably, one end of the outer wall of the rotating cylinder 4 is provided with a second step 43, and the driven wheel 71 is mounted on the outer wall of the smaller end corresponding to the second step 43.

[0045] In this embodiment, the tilt angle of the directional probe 100 needs to be adjusted, that is, the tilt angle of the rotating cylinder 4 needs to be adjusted. In order to prevent the rotating drive mechanism from driving the rotating cylinder 4 to rotate even after the tilt angle of the rotating cylinder 4 is adjusted, it is necessary to limit the rotating drive mechanism to move synchronously with the tilt angle adjustment of the rotating cylinder 4. This can be achieved in the following way: The drive end of the rotary drive mechanism is connected to the housing 21 via connector 10, specifically, as follows: Figure 4 As shown, the connector 10 includes a connecting plate 101, a fixed cylinder 102, and a second bearing 103. The fixed cylinder 102 is disposed outside the power output shaft of the first motor 74 of the rotary drive mechanism via the second bearing 103. The connecting plate 101 is used to connect the housing 21 and the fixed cylinder 102. Preferably, it also includes a protective cover 6 disposed outside the rotary drive mechanism.

[0046] A conductive slip ring 3 is coaxially mounted on the outer wall of the rotating cylinder 4 and is used to connect the signal cable of the directional probe 100. The conductive slip ring 3, the outer shell 21, and the driven wheel 71 are arranged sequentially along the axial direction of the rotating cylinder 4. The conductive slip ring 3 is existing technology. The stationary part (stator) and the rotating part (rotor) of the conductive slip ring 3 are connected to the circuit through the sliding contact between the brush and the conductive ring. The specific structure will not be described in detail here. In this embodiment, by setting the conductive slip ring 3, the signal output of the directional probe 100 can be obtained by collecting the output of the conductive slip ring 3. Since the stator of the conductive slip ring 3 remains stationary during the rotation of the directional probe 100, stable signal transmission is achieved. The conductive slip ring 3 is made of non-magnetic material. The design of non-magnetic material avoids interference and ensures smooth and safe rotation.

[0047] The tilt adjustment mechanism 5 is used to support the fixed positioning mechanism 2 and adjust the tilt angle of the positioning mechanism 2. Specifically, the tilt adjustment mechanism 5 includes a rotating shaft 51, a bearing 52 with a seat, and a second motor. The bearing 52 is mounted on the crossbar 13 at the top of the fixed frame 1. The tilt adjustment mechanism 5 is provided on both sides of the outer shell 21 along its length, which is the axial direction of the directional probe 100. The rotating shaft 51 is rotatably mounted inside the bearing 52, and one end of the rotating shaft 51 is fixedly connected to the outer wall of the outer shell 21 of the positioning mechanism 2. The second motor is used to drive the rotating shaft 51 to rotate. The rotating shaft 51 is arranged perpendicularly to the rotating cylinder 4. By rotating the shaft 51, the tilt angle of the outer shell 21 can be adjusted, thereby adjusting the tilt angle of the rotating cylinder 4 and the directional probe 100. There is a corresponding relationship between the circumferential rotation of the shaft 51 and the tilt angle of the outer shell 21. This relationship can be obtained by testing several sets of data. For example, when the tilt angle of the outer shell 21 is 0°, the circumferential rotation of the shaft 51 is 0°. When the circumferential rotation of the shaft 51 is 10°, the tilt angle of the outer shell 21 is recorded as V1. When the circumferential rotation of the shaft 51 is 20°, the tilt angle of the outer shell 21 is recorded as V2, and so on. In this way, several sets of data can be obtained to show that there is a corresponding relationship between the circumferential rotation of the shaft 51 and the tilt angle of the outer shell 21.

[0048] In a preferred embodiment, the outer wall of the housing 21 is provided with a groove 211, and one end of the rotating shaft 51 is provided with a connecting part 53. The connecting part 53 is fixed in the groove 211 by bolts. The connecting part 53 can be an annular protrusion, a disc, or a fixing block.

[0049] The correction unit is used to correct the radial runout of the rotating cylinder 4 during rotation. The correction unit includes a radial displacement sensor 500, a positioning sleeve 8, an adjustable clamping mechanism 9, a radial offset calculation module, and a controller. At least two radial displacement sensors 500 are arranged along the axial direction of the rotating cylinder 4. The radial displacement sensors 500 are used to collect the radial offset during the rotation of the rotating cylinder 4. The radial offset calculation module calculates the axial angular deviation V of the rotating cylinder 4 relative to its initial state based on the radial offset. p The rotating cylinder 4 has positioning sleeves 8 coaxially arranged at both ends. The adjustable clamping mechanism 9 includes at least two clamping members arranged symmetrically. The tilt angle of the directional probe 100 is corrected by the radial extension and retraction of the clamping members.

[0050] In a specific case, such as Figures 5-6As shown, the adjustable clamping mechanism 9 includes two clamping members arranged symmetrically. In the initial state, the two clamping members are located at the lowest and highest points of the rotating cylinder 4 in the vertical direction, respectively. The positioning sleeve 8 includes a sleeve 81. The inner diameter of the sleeve 81 is equal to the outer diameter at the position where it is fixed to the rotating cylinder 4. The sleeve 81 is coaxially fixed to the outer wall of the rotating cylinder 4 by bolts. One end of the sleeve 81 is provided with an annular protrusion 82 for installing the adjustable clamping mechanism 9. The radial width of the annular protrusion 82 is greater than the radial width of the sleeve 81, and the inner and outer walls of the annular protrusion 82 protrude from the inner and outer walls of the sleeve 81, respectively. The inner wall of the annular protrusion 82 is flush with the inner wall of the end of the rotating cylinder 4. The clamping component includes a telescopic component 91 and an arc-shaped clamping plate 92. The telescopic end of the telescopic component 91 is connected to the outer wall of the arc-shaped clamping plate 92. The arc-shaped clamping plate 92 cooperates with the directional probe 100. The directional probe 100 is clamped and fixed by the two arc-shaped clamping plates 92. The telescopic component 91 is an existing linearly telescopic structure, which can be a hydraulic cylinder, etc.

[0051] like Figure 7 As shown, in this embodiment, two radial displacement sensors 500 are arranged along the axial direction of the rotating cylinder 4. The two radial displacement sensors 500 are fixed on the outer shell 21, and the radial sections where the two radial displacement sensors 500 are located are respectively denoted as the first detection section 600 and the second detection section 700.

[0052] like Figure 8 , Figure 9 As shown, a specific correction process in this embodiment is as follows: Assuming we need to simulate the tilt angle of the directional probe 100 relative to the horizontal direction as V0 (e.g., 102°), the second motor controls the rotation of the shaft 51 until the rotating cylinder 4 rotates from a horizontal state to a tilt angle of V0. At this point, since the directional probe 100 is coaxially fixed inside the rotating cylinder 4, the tilt angle of the directional probe 100 is V0. At this time, the radial distance R detected by the two radial displacement sensors 500 is... 01 and R 02 They are equal because at this time, the rotating cylinder 4 is at rest and the outer shell 21 is coaxial.

[0053] In actual operation, when the rotary drive mechanism drives the rotating cylinder 4 to rotate, the rotating cylinder 4 will experience radial runout (radial offset). One type of runout is as follows: Figure 9 As shown, this embodiment uses... Figure 9 The radial runout shown illustrates the specific correction process; other runout patterns are similar. At this point, the two radial displacement sensors 500 respectively detect the radial distance R... 11 and R 12 The axes are not equal. At this point, the central axis of the rotating cylinder 4 shifts relative to its initial state (stationary state) by an angle of V. p V p Through R11 and R 12 The calculation is obtained using the formula: tanθ = (R 11 - R 12 ) / D, where θ is V p D is the straight-line distance between the first detection section 600 and the second detection section 700, and R 11 and R 12 The radial displacements collected by the radial displacement sensors 500 corresponding to the first detection section 600 and the second detection section 700 are respectively. When the radial offset calculation module calculates the result as V... p A value greater than 0 indicates that the rotating cylinder 4 has undergone radial displacement during rotation, meaning the tilt angle of the directional probe 100 during rotation is no longer the initially set tilt angle V0, and it cannot accurately simulate the attitude at tilt angle V0. Therefore, the tilt angle of the directional probe 100 during rotation needs to be corrected. When the rotating cylinder 4 stops rotating and returns to its initial state (the two clamping members are located at the lowest and highest points of the rotating cylinder 4 in the vertical direction, respectively), the controller controls the extension and retraction of the telescopic members 91 of the adjustable clamping mechanisms 9 at both ends of the rotating cylinder 4 to adjust the tilt angle of the directional probe 100 in the initial state, so that the directional probe 100 in the initial state (stationary state) is not coaxial with the rotating cylinder 4. Specifically, the tilt angle of the directional probe 100 is adjusted in opposite directions. Figures 8 to 9 The state is equivalent to the central axis of the rotating cylinder 4 shifting upwards in a clockwise direction by V as shown in the diagram. p Therefore, in the stationary state, the central axis of the directional probe 100 needs to be offset downwards by V in the counterclockwise direction relative to the rotating cylinder 4 as shown in the figure. p At this time, the specific operation of the telescopic member 91 of the adjustable clamping mechanism 9 at both ends is as follows: the controller controls the top telescopic member 91 of the adjustable clamping mechanism 9 corresponding to the first detection section 600 to extend and the bottom telescopic member 91 to retract, so that the directional probe 100 is offset downward on the left side (on the side of the first detection section 600) in the direction shown in the figure, and the specific offset amount is R. 11 - R 01 Simultaneously, the controller controls the top telescopic member 91 of the adjustable clamping mechanism 9 corresponding to the second detection section 700 to retract and the bottom telescopic member 91 to extend, causing the directional probe 100 to shift upward on the right side (on the side of the second detection section 700) in the direction shown in the figure, with a specific offset amount of R. 12 - R 02 This ensures that the tilt angle of the directional probe 100 in the rotating state is consistent with the set V0.

[0054] All components of the oilfield drilling measurement rotary calibration device are made of non-magnetic materials.

[0055] In this embodiment, a control box 200 is provided on the fixed frame 1 for automatic control of the oilfield drilling measurement rotary calibration device. The control box 200 is used to control the start and stop of the first motor 74 and the second motor and to perform speed regulation control.

[0056] This embodiment utilizes a rotating cylinder 4, a positioning mechanism 2, and an inclination adjustment mechanism 5, which work together. The rotating cylinder 4 and the positioning mechanism 2 rotate relative to each other, while the inclination adjustment mechanism 5 supports and fixes the positioning mechanism 2 and adjusts the inclination angle of the rotating cylinder 4. This enables the installation of the directional probe 100 and allows the directional probe 100 to rotate around its own axis at different inclination angles. The conductive slip ring 3 ensures that the directional probe 100 outputs a stable signal during rotation. The non-magnetic design avoids interference and ensures smooth and safe rotation. In other words, this embodiment can simulate the movement state of the directional probe 100 during actual downhole operations and can calibrate the output signal of the directional probe 100 at different inclination angles during rotation.

[0057] The method of using the oilfield measurement-while-drilling rotary calibration device in this embodiment includes the following steps: S1. Coaxially install the directional probe 100 inside the rotating cylinder 4; S2. Adjust the tilt angle of the rotating cylinder 4 by means of the tilt angle adjustment mechanism 5 so that the rotating cylinder 4 forms an angle of 0-90° with the horizontal direction, and record the initial tilt angle V0. S3. Drive the rotary drive mechanism to make the rotating cylinder 4 rotate 360° around its own axis. During the rotation, the radial displacement sensor 500 collects the radial offset of the rotating cylinder 4. The radial offset calculation module calculates the axial angle deviation V of the rotating cylinder 4 relative to the initial tilt angle V0 based on the radial offset. p ; S4. The rotating cylinder 4 stops rotating and returns to the initial circumferential position. The controller controls the adjustable clamping mechanism 9 to perform radial extension and retraction correction of the tilt angle of the directional probe 100 based on the axial angle deviation. The purpose is to ensure that the tilt angle rotation process of the directional probe 100 is consistent with the initial state. S5. Drive the rotary drive mechanism to make the rotating cylinder 4 rotate 360° around its own axis, and calculate the axial angle deviation V. p Repeat steps S3-S5 until V rotates. p It is zero; S6. During the rotation process, the difference between the data output of the directional probe 100 and the standard data output is determined by collecting the signal exported from the conductive slip ring 3, so as to perform calibration processing of the directional probe 100. By adjusting the tilt angle of the rotating drum 4 through operation step S2, the rotation of the simulated directional probe 100 at different tilt angles can be achieved.

[0058] Example 2: This embodiment is based on embodiment 1. In order to avoid the calculation error of the tilt angle of the rotating cylinder 4 caused by the error of the second motor and the transmission error of the connection between the second motor and the rotating shaft 51, the outer wall of the rotating cylinder 4 in this embodiment is coaxially provided with a first rotating phase encoder 300, and the outer wall of the rotating shaft 51 is coaxially provided with a second rotating phase encoder 400. The first rotating phase encoder 300 and the second rotating phase encoder 400 are communicatively connected to the controller.

[0059] Example 3: This embodiment is based on Embodiment 1 or Embodiment 2. In this embodiment, to more intuitively observe the tilt angle of the rotating cylinder 4, such as... Figure 10 As shown, a scale 54 is fixed on the rotating shaft 51. The tilt angle of the directional probe 100 can be observed through the scale 54. The structure of the scale 54 is as follows: Figure 9 As shown, the dial 54 has graduations from 0° to 90°, arranged on a quarter-circle arc. When the tilt angle of the rotating cylinder 4 is 0°, the 0° graduation on the dial is parallel to the axis of the rotating cylinder 4, and the 90° graduation on the dial is perpendicular to the axis of the rotating cylinder 4.

[0060] The above specific embodiments further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0061] It should be noted that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

Claims

1. A rotary calibration device for oilfield measurement while drilling, comprising a fixed frame (1), characterized in that, Also includes: A rotating cylinder (4) is used to fix a directional probe (100), the directional probe (100) being coaxially arranged inside the rotating cylinder (4); A positioning mechanism (2) is used to support the rotating cylinder (4), which is rotatably mounted in the positioning mechanism (2) via a first bearing (22); A rotary drive mechanism is connected to the rotary cylinder (4) for driving the rotary cylinder (4) to rotate around its own axis; A conductive slip ring (3) is coaxially disposed on the outer wall of the rotating cylinder (4) for connecting the signal cable of the directional probe (100); An angle adjustment mechanism (5) is used to support and fix the positioning mechanism (2) and adjust the angle of the positioning mechanism (2); A correction unit is used to correct the radial runout of the rotating cylinder (4) during rotation. The correction unit includes a radial displacement sensor (500), a positioning sleeve (8), an adjustable clamping mechanism (9), a radial offset calculation module, and a controller. At least two radial displacement sensors (500) are provided along the axial direction of the rotating cylinder (4). The radial displacement sensors (500) are used to collect the radial offset during the rotation of the rotating cylinder (4). The radial offset calculation module calculates the axial angle deviation of the rotating cylinder (4) relative to the initial state based on the radial offset. The positioning sleeve (8) is coaxially provided at both ends of the rotating cylinder (4). The adjustable clamping mechanism (9) includes at least two clamping members arranged symmetrically. The tilt angle of the directional probe (100) is corrected by the radial extension and retraction of the clamping members. All components of the oilfield drilling measurement rotary calibration device are made of non-magnetic materials.

2. The oilfield drilling measurement rotating calibration device according to claim 1, characterized in that, The tilt adjustment mechanism (5) includes a rotating shaft (51), a seated bearing (52), and a second motor. The seated bearing (52) is mounted on the fixed frame (1). The rotating shaft (51) is rotatably disposed within the seated bearing (52), and one end of the rotating shaft (51) is fixedly connected to the positioning mechanism (2). The second motor is used to drive the rotating shaft (51) to rotate. The rotating shaft (51) is perpendicular to the rotating cylinder (4).

3. The oilfield drilling measurement rotating calibration device according to claim 2, characterized in that, The outer wall of the rotating cylinder (4) is coaxially provided with a first rotary phase encoder (300), and the outer wall of the rotating shaft (51) is coaxially provided with a second rotary phase encoder (400). The first rotary phase encoder (300) and the second rotary phase encoder (400) are communicatively connected to the controller.

4. The oilfield drilling measurement rotating calibration device according to claim 2, characterized in that, The positioning mechanism includes a housing (21), a first bearing (22) for supporting the rotating cylinder (4) is provided inside the housing (21), a groove (211) is provided on the outer wall of the housing (21), and a connecting part (53) is provided at one end of the rotating shaft (51), the connecting part (53) is fixed in the groove (211).

5. The oilfield drilling measurement rotating calibration device according to claim 4, characterized in that, The drive end of the rotary drive mechanism is connected to the housing (21) via a connector (10).

6. The oilfield drilling measurement rotating calibration device according to claim 5, characterized in that, The connector (10) includes a connecting plate (101), a fixed cylinder (102), and a second bearing (103). The fixed cylinder (102) is disposed outside the power output shaft of the first motor (74) of the rotary drive mechanism via the second bearing (103). The connecting plate (101) is used to connect the outer shell (21) and the fixed cylinder (102).

7. The oilfield drilling measurement rotating calibration device according to claim 2, characterized in that, A dial (54) is fixed on the rotating shaft (51).

8. The oilfield drilling measurement rotating calibration device according to claim 1, characterized in that, The outer wall of the rotating cylinder (4) protrudes outward along the radial direction to form an annular protrusion (41), and the two ends of the annular protrusion (41) form a first step (42) that cooperates with the first bearing (22).

9. The oilfield drilling measurement rotating calibration device according to claim 1, characterized in that, The clamping component includes a telescopic component (91) and an arc-shaped clamping plate (92). The telescopic end of the telescopic component (91) is connected to the outer wall of the arc-shaped clamping plate (92), and the arc-shaped clamping plate (92) cooperates with the directional probe (100).

10. The oilfield drilling measurement rotating calibration device according to claim 1, characterized in that, It also includes a protective cover (6) disposed on the outside of the rotary drive mechanism.

11. A rotary calibration device for oilfield measurement while drilling according to any one of claims 1-10, characterized in that, The bottom of the fixed frame (1) is provided with telescopic walking wheels (11) and support legs (12), or the bottom of the fixed frame (1) is provided with locking moving rollers.

12. A rotary calibration device for oilfield measurement while drilling according to any one of claims 1-10, characterized in that, The fixed frame (1) is equipped with a control box (200) for automatically controlling the oilfield drilling measurement rotary calibration device.

13. The method of using the oilfield drilling measurement rotating calibration device as described in any one of claims 1-12, characterized in that, Includes the following steps: S1. The directional probe (100) is coaxially installed inside the rotating cylinder (4); S2. Adjust the tilt angle of the rotating cylinder (4) by means of the tilt angle adjustment mechanism (5) so that the rotating cylinder (4) forms an angle of 0-90° with the horizontal direction, and record the initial tilt angle V0 of the rotating cylinder (4); S3. Drive the rotary drive mechanism to make the rotating cylinder (4) rotate 360° around its own axis. During the rotation, the radial displacement sensor (500) collects the radial offset of the rotating cylinder (4). The radial offset calculation module calculates the axial angle deviation V of the rotating cylinder (4) relative to the initial tilt angle V0 based on the radial offset. p ; S4. The rotating cylinder (4) stops rotating and returns to the initial circumferential position. The controller controls the adjustable clamping mechanism (9) to perform radial extension and retraction correction of the tilt angle of the directional probe (100) based on the axial angle deviation. S5. Drive the rotary drive mechanism to make the rotating cylinder (4) rotate 360° around its own axis, and calculate the axial angle deviation V. p Repeat steps S3-S5 until V rotates. p It is zero; S6. During the rotation process, the difference between the data output of the directional probe (100) and the standard data output is determined by collecting the signal exported by the conductive slip ring (3) in order to perform calibration processing of the directional probe (100); By adjusting the tilt angle of the rotating drum (4) through operation step S2, the rotation of the directional probe (100) at different tilt angles can be simulated.

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