Measurement-while-drilling directional probe system

Abstract

The utility model belongs to directional drilling technical field discloses a kind of while drilling survey directional probe system, including centralizer, shock absorber, gravimeter, magnetometer and directional probe skeleton.Shock absorber is connected between centralizer and directional probe skeleton.Gravimeter and magnetometer are all arranged on directional probe skeleton.The utility model can effectively reduce high-frequency vibration transmission to directional probe skeleton by setting shock absorber, and then reduce the influence of vibration on gravimeter and magnetometer measurement result, improve the accuracy of measurement result;And by gravimeter and magnetometer are all arranged on directional probe skeleton, magnetometer can measure the change of direction, gravimeter can also extract real gravity measurement value by the change of magnetometer reading, to improve the accuracy of gravimeter measurement;In addition, by magnetometer being arranged between gravimeter and shock absorber, so that magnetometer can more sensitively detect the change of direction, and gravimeter can reduce the adverse effects of vibration on it.

Description

Technical Field

[0001] This utility model relates to the field of directional drilling technology, and in particular to a directional probe system for measurement while drilling. Background Technology

[0002] The directional drilling system in measurement-while-drilling (MWD) equipment is mainly used to measure the spatial attitude of the drill string within the well. Its core function is to acquire key parameters such as the azimuth, dip angle, and tool face angle of the drill bit in three-dimensional space in real time, providing accurate guidance data for directional drilling. In the exploration and development of resources such as oil and natural gas, directional drilling technology is widely used because it enables precise control of wells with complex trajectories.

[0003] As a core component of measurement-while-drilling (MWD) equipment, the directional probe system measures changes in the Earth's gravitational and magnetic fields using high-precision sensors such as gravimeters, magnetometers, and gyroscopes, thereby calculating the real-time spatial attitude of the drill string. However, the downhole environment is harsh, and the directional probe system also vibrates during drilling, which can adversely affect the accuracy of the gravimeter readings. Vibration may cause changes in the gravimeter's acceleration, or changes in direction that alter the gravitational component and centrifugal force, leading to inaccurate data from the gravimeter and consequently affecting gravity measurements. Utility Model Content

[0004] The present invention provides a directional probe system for measurement while drilling, which can improve the accuracy of gravity detection.

[0005] The above-mentioned technical problems are solved by the following technical solutions:

[0006] The measurement-while-drilling directional pipe system includes a centralizer, a vibration damper, a gravimeter, a magnetometer, and a directional pipe frame. The gravimeter and the magnetometer are both mounted on the directional pipe frame. The vibration damper is connected between the centralizer and the directional pipe frame. The magnetometer is mounted between the gravimeter and the vibration damper.

[0007] In one embodiment, the gravimeter is disposed on the end of the directional probe frame away from the vibration damper.

[0008] In one embodiment, the magnetometer is disposed on the end of the directional probe frame near the damper.

[0009] In one embodiment, the measurement-while-drilling directional pipe system further includes a directional casing fitted over the directional pipe skeleton;

[0010] Multiple sets of rings spaced apart along the axial direction of the directional probe frame are sandwiched between the outer wall of the directional probe frame and the directional sleeve.

[0011] In one embodiment, the measurement-while-drilling directional probe system further includes two first circuit board assemblies and second circuit board assemblies spaced apart on the directional probe frame, both the first circuit board assembly and the second circuit board assembly being located between the gravimeter and the magnetometer;

[0012] The rings are arranged in five groups, which are spaced apart and form an installation area between any two adjacent groups of rings. The gravimeter, the first circuit board assembly, the second circuit board assembly and the magnetometer are respectively arranged in four installation areas.

[0013] In one embodiment, the outer wall of the end of the directional probe frame away from the vibration damper has two first mounting grooves, and the end face of the directional probe frame away from the vibration damper has a second mounting groove. The axis of the second mounting groove coincides with the axis of the directional probe frame, and the axes of the two first mounting grooves are perpendicular to each other and both perpendicular to the axis of the directional probe frame.

[0014] The gravimeter is provided in three parts: two of the gravimeters are installed in the two first mounting slots respectively, and the remaining gravimeter is installed in the second mounting slot.

[0015] In one embodiment, a pressure ring is provided in the first mounting groove, the pressure ring being connected to the directional probe frame and used to fix the gravimeter located in the first mounting groove;

[0016] The second mounting groove is provided with a connector and a bushing. The connector is inserted into the second mounting groove and fixedly connected to the directional probe frame. The bushing is provided in the second mounting groove and sandwiched between the connector and the gravimeter located in the second mounting groove.

[0017] In one embodiment, the directional probe frame has a third mounting groove on its end face near the vibration damper, and the magnetometer is disposed in the third mounting groove;

[0018] The directional probe frame has a curved cable routing groove on the outer wall of the end near the vibration damper, and the bottom of the cable routing groove has a second cable passage hole that communicates with the third mounting groove.

[0019] In one embodiment, the outer wall of the directional probe skeleton is further fitted with a first protective sleeve and a second protective sleeve for protecting the gravimeter and the magnetometer.

[0020] In one embodiment, the vibration damper includes:

[0021] A vibration damping sleeve, wherein the inner wall of the vibration damping sleeve is provided with a first annular partition;

[0022] A vibration damping core tube, wherein a second annular partition is provided on the outer wall of the vibration damping core tube, the vibration damping core tube is disposed inside the vibration damping sleeve, and the first annular partition and the second annular partition are staggered.

[0023] The gap between the damping sleeve and the damping core tube is filled with a damping medium, which solidifies in the gap to form a damping core with elastic properties.

[0024] The beneficial effects of this utility model are as follows:

[0025] The directional drilling measurement system provided by this invention can effectively reduce the transmission of high-frequency vibrations to the directional drilling frame, thereby reducing the impact of vibrations on the measurement results of the gravimeter and magnetometer and improving the accuracy of the measurement results. Furthermore, by placing both the gravimeter and magnetometer on the directional drilling frame, the magnetometer can measure changes in direction, and the gravimeter can extract the true gravity measurement value by utilizing changes in the magnetometer reading, thus improving the accuracy of the gravimeter measurement. Additionally, by placing the magnetometer between the gravimeter and the vibration damper, the magnetometer is closer to the vibration damper than the gravimeter, allowing the magnetometer to more sensitively detect changes in direction, while the gravimeter is further away from the vibration damper than the magnetometer, thus reducing the adverse effects of vibration on the gravimeter. Attached Figure Description

[0026] Figure 1 This is a first-view structural diagram of the directional probe frame, gravimeter, and magnetometer involved in the embodiments of this utility model;

[0027] Figure 2 This is a schematic diagram of the structure of the shock absorber and the stabilizer involved in the embodiments of this utility model;

[0028] Figure 3 yes Figure 1 Cross-sectional view of AA;

[0029] Figure 4 This is a second-view structural schematic diagram of the directional probe frame, gravimeter, and magnetometer involved in the embodiments of this utility model;

[0030] Figure 5 yes Figure 2 Enlarged view of the structure at point B.

[0031] In the picture:

[0032] 1. Stabilizer;

[0033] 2. Vibration damper; 21. Vibration damping sleeve; 211. First annular partition; 22. Vibration damping core tube; 221. Second annular partition;

[0034] 3. Gravimeter;

[0035] 4. Magnetometer;

[0036] 5. Directional probe frame; 51. Pressure ring; 52. Connector; 53. Bushing; 54. Cable tray;

[0037] 6. Ring;

[0038] 7. First circuit board assembly;

[0039] 8. Second circuit board assembly. Detailed Implementation

[0040] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0041] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0042] 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. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0043] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0044] like Figures 1-5As shown, this embodiment of the present invention provides a measurement-while-drilling (MWD) directional pipe system, which includes a stabilizer 1, a vibration damper 2, a gravimeter 3, a magnetometer 4, and a directional pipe frame 5. The vibration damper 2 is connected (either by a ball joint or a hinge) between the stabilizer 1 and the directional pipe frame 5, that is, the vibration damper 2 is located at the lower end of the directional pipe frame 5, and the stabilizer 1 is connected to the lower end of the vibration damper 2. During drilling, the stabilizer 1 is used to center the MWD directional pipe system within the well, and the stabilizer 1 is the main source of axial vibration; the vibration damper 2 is located at the upper end of the stabilizer 1 to reduce the impact of vibration on the directional pipe frame 5.

[0045] Both the gravimeter 3 and the magnetometer 4 are mounted on the directional probe frame 5. The directional probe frame 5 is an integral structure with relatively uniform rigidity. When the drill bit is drilling, the gravimeter 3 and the magnetometer 4 located on the directional probe frame 5 have the same vibration frequency. Moreover, the changes in the magnetometer 4 reading caused by vibration are different in nature from the changes in the gravimeter 3 reading caused by vibration. The magnetometer 4 truly reflects the change in the measurement direction, while the change in the gravimeter 3 may be a change in acceleration caused by vibration, or a change in the gravitational component and centrifugal force caused by the change in direction. Therefore, the true gravity measurement value can be extracted from the measurement results of the gravimeter 3 by using the changes in the magnetometer 4 reading.

[0046] This directional drilling measurement system, by incorporating a vibration damper 2, effectively reduces the transmission of high-frequency vibrations to the directional drilling frame 5, thereby reducing the impact of vibrations on the measurement results of the gravimeter 3 and magnetometer 4 and improving the accuracy of the measurement results. Furthermore, by placing both the gravimeter 3 and magnetometer 4 on the directional drilling frame 5, the magnetometer 4 can measure changes in direction, and the gravimeter 3 can extract the true gravity measurement value by utilizing changes in the magnetometer 4 reading, thus improving the accuracy of the gravimeter 3's measurement. Additionally, by placing the magnetometer 4 between the gravimeter 3 and the vibration damper 2, the magnetometer 4 is closer to the vibration damper 2 relative to the gravimeter 3, allowing the magnetometer 4 to more sensitively detect changes in direction, while the gravimeter 3 is further away from the vibration damper 2 relative to the magnetometer 4, thus reducing the adverse effects of vibration on the gravimeter 3.

[0047] It should be explained that in the prior art, the magnetometer 4 is generally placed between the vibration damper 2 and the centralizer 1 so that the magnetometer 4 can more sensitively sense the directional changes caused by vibration. However, in this design, the electronic system consisting of the magnetometer 4, gravimeter 3, and circuit module is divided by the vibration damper 2, which is not conducive to circuit layout, easily generates additional noise, and affects the correlation of the responses of the magnetometer 4 and gravimeter 3, making it difficult to process the measurement signals of the magnetometer 4 and gravimeter 3 using a fusion method. Therefore, in this embodiment, the magnetometer 4 is not placed between the vibration damper 2 and the centralizer 1, but both the magnetometer 4 and the gravimeter 3 are placed on the directional probe frame 5 to solve the above problems.

[0048] In this embodiment, the gravimeter 3 is disposed on the end of the directional probe frame 5 away from the vibration damper 2. By disposing of the gravimeter 3 on the end of the directional probe frame 5 away from the vibration damper, the influence of vibration on the gravimeter 3 can be reduced, so that the gravimeter 3 can measure the corresponding interference components and eliminate adverse effects.

[0049] In this embodiment, the magnetometer 4 is disposed at the end of the directional probe frame 5 near the vibration damper 2. By placing the magnetometer 4 near the vibration damper 2, the magnetometer 4 can more sensitively detect the directional changes caused by vibration, thereby improving the directional sensitivity of the magnetometer 4 and thus improving the accuracy of gravity measurement.

[0050] In this embodiment, the measurement-while-drilling directional pipe system also includes a directional casing fitted outside the directional pipe skeleton 5. The directional casing is used to prevent impurities such as drilling mud in the well from corroding the directional pipe skeleton 5.

[0051] To further reduce the impact of vibration on the directional probe frame 5, multiple sets of rings 6 are spaced apart along the axial direction of the directional probe frame 5 between the directional probe frame 5 and the directional sleeve. The rings 6 can be O-rings. By setting multiple sets of rings 6, the overall vibration reduction effect of the directional probe frame 5 can be increased, thereby reducing the transmission of non-axial vibration to the gravimeter 3 and reducing the impact of vibration on the gravimeter 3.

[0052] In this embodiment, the measurement-while-drilling directional probe system also includes a circuit module, which includes a first circuit board assembly 7 and a second circuit board assembly 8 spaced apart on the directional probe frame 5. Both the first circuit board assembly 7 and the second circuit board assembly 8 are located between the gravimeter 3 and the magnetometer 4.

[0053] Optionally, five sets of rings 6 are provided, with the five sets of rings 6 spaced apart and forming installation areas between any two adjacent sets of rings 6. The gravimeter 3, the first circuit board assembly 7, the second circuit board assembly 8, and the magnetometer 4 are respectively installed in four installation areas. This structure, along the axial direction of the directional probe frame 5, reduces the impact of vibration on the gravimeter 3, the first circuit board assembly 7, the second circuit board assembly 8, and the magnetometer 4 by providing rings 6 on both sides of the gravimeter 3, both sides of the first circuit board assembly 7, both sides of the second circuit board assembly 8, and both sides of the magnetometer 4.

[0054] Optionally, each group of rings 6 contains at least three rings 6 to improve vibration damping. It is understood that, space permitting, the more rings 6 in each group, the better the vibration damping effect. In this embodiment, each group of rings 6 contains three rings 6.

[0055] In this embodiment, as Figures 3-4 As shown, three gravimeters 3 (which can be either quartz gauges or accelerometers) are provided, distributed along three axes. Two mutually perpendicular first mounting slots are formed on the outer wall of the end of the directional probe frame 5 furthest from the vibration damper 2. A second mounting slot is formed on the end face of the directional probe frame 5 furthest from the vibration damper 2, with the axis of the second mounting slot coinciding with the axis of the directional probe frame 5. The axes of the two first mounting slots are perpendicular to the axis of the directional probe frame 5. Two gravimeters 3 are installed in the two first mounting slots, and the remaining gravimeter 3 is placed in the second mounting slot, thus achieving a triaxial distribution of the three gravimeters 3.

[0056] Optionally, the first mounting groove includes a groove and a mounting hole disposed on the bottom surface of the groove. The gravimeter 3 is disposed in the mounting hole and the end of the gravimeter 3 extends into the groove. A pressure ring 51 is disposed in the first mounting groove. The pressure ring 51 has a first central hole for avoiding the gravimeter 3. The pressure cap is connected to the directional probe frame 5 by screws, that is, the pressure cap is connected to the bottom surface of the groove by screws. The gravimeter 3 extends out through the first central hole and is fixed in the mounting hole by the pressure cap, so as to realize the installation of the gravimeter 3 and the first mounting groove, and the first central hole does not affect the wiring of the gravimeter 3.

[0057] Optionally, a connector 52 and a bushing 53 are provided in the second mounting groove. The connector 52 is inserted into the second mounting groove and fixedly connected to the directional probe frame 5 by a set screw. The bushing 53 is disposed in the second mounting groove and sandwiched between the connector 52 and the gravimeter 3 located in the second mounting groove, so that the gravimeter 3 can be installed in the second mounting groove. In this embodiment, the outer wall of the directional probe frame 5 has a first wire-passing hole communicating with the second mounting groove. The gravimeter 3 can be wired through the first wire-passing hole and the second center hole of the bushing 53.

[0058] In this embodiment, the end face of the directional probe frame 5 near the vibration damper 2 is provided with a third mounting groove, and the magnetometer 4 is set in the third mounting groove and connected by screws and set screws.

[0059] Optionally, the outer wall of the directional probe frame 5 near the vibration damper 2 is provided with a curved wiring groove 54. The wiring groove 54 is connected to the third mounting groove through a second wire through hole, and the magnetometer 4 is connected to the wire through the wiring groove 54 and the second wire through hole. By setting the curved wiring groove 54 in this structure, the structural strength of the directional probe frame 5 can be improved.

[0060] Optionally, the directional probe frame 5 further includes a first protective sleeve and a second protective sleeve fitted at both ends of the directional probe frame 5. The first protective sleeve is fitted on the outer wall of the end of the directional probe frame 5 away from the vibration damper 2 to protect the gravimeter 3 from damage or impurities affecting the accuracy of the gravimeter 3. The second protective sleeve is fitted on the outer wall of the end of the directional probe frame 5 close to the vibration damper 2 to protect the magnetometer 4 from damage or impurities affecting the accuracy of the magnetometer 4.

[0061] Optionally, such as Figure 5 As shown, the vibration damper 2 includes a vibration damping sleeve 21 and a vibration damping core tube 22. The vibration damping sleeve 21 is connected to the centralizer 1, and the vibration damping core tube 22 is connected to the directional probe frame 5. The inner wall of the vibration damping sleeve 21 is provided with a first annular partition 211; the outer wall of the vibration damping core tube 22 is provided with a second annular partition 221. The vibration damping core tube 22 is disposed inside the vibration damping sleeve 21, and the first annular partition 211 and the second annular partition 221 are staggered.

[0062] When the damping core tube 22 is placed inside the damping sleeve 21, there is a gap between the damping core tube 22 and the damping sleeve 21. By filling the gap with damping medium, the damping medium can form a damping core with elastic properties after solidification.

[0063] The outer wall of the vibration damping core forms a first annular groove covering the first annular partition 211 in the area corresponding to the first annular partition 211, and the inner wall of the vibration damping core forms a second annular groove covering the second annular partition 221 in the area corresponding to the second annular partition 221. The vibration damping core is engaged with the first annular partition 211 through the first annular groove to achieve an elastic connection between the vibration damping core and the vibration damping sleeve 21, and the vibration damping core is engaged with the second annular partition 221 through the second annular groove to achieve an elastic connection between the vibration damping core and the vibration damping core tube 22.

[0064] The vibration damper 2, by setting a first annular baffle 211 on the inner wall of the vibration damping sleeve 21 and a second annular baffle 221 on the outer wall of the vibration damping core tube 22, enables the vibration damping core to be elastically connected between the vibration damping sleeve 21 and the vibration damping core tube 22, avoiding the use of traditional limiting structures for connection; in addition, the first annular baffle 211 and the second annular baffle 221 are staggered, so that the inner and outer walls of the formed vibration damping core form a wave-like curve, which can increase the flexibility of the vibration damping core, avoid stress concentration in the vibration damping core, make the vibration damping core uniformly stressed, and improve vibration damping performance and service life.

[0065] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0066] The specific embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A directional drilling measurement-while-drilling system, characterized in that, The device includes a centralizer (1), a vibration damper (2), a gravimeter (3), a magnetometer (4), and a directional probe frame (5). The gravimeter (3) and the magnetometer (4) are both mounted on the directional probe frame (5). The vibration damper (2) is connected between the centralizer (1) and the directional probe frame (5). The magnetometer (4) is located between the gravimeter (3) and the vibration damper (2).

2. The directional drilling measurement-while-drilling system according to claim 1, characterized in that, The gravimeter (3) is located on the end of the directional probe frame (5) away from the vibration damper (2).

3. The directional drilling measurement-while-drilling system according to claim 1, characterized in that, The magnetometer (4) is mounted on the directional probe frame (5) at the end near the vibration damper (2).

4. The directional drilling measurement-while-drilling system according to claim 1, characterized in that, The measurement-while-drilling directional probe system also includes a directional casing fitted outside the directional probe frame (5); Multiple sets of annular rings (6) are spaced apart along the axial direction of the directional probe frame (5) between the outer wall of the directional probe frame (5) and the directional sleeve.

5. The directional drilling measurement-while-drilling system according to claim 4, characterized in that, The measurement while drilling directional probe system also includes two circuit board assemblies (7 and 8) spaced apart on the directional probe frame (5), with the first circuit board assembly (7) and the second circuit board assembly (8) located between the gravimeter (3) and the magnetometer (4). The rings (6) are arranged in five groups, and the five groups of rings (6) are distributed at intervals and form an installation area between any two adjacent groups of rings (6). The gravimeter (3), the first circuit board assembly (7), the second circuit board assembly (8) and the magnetometer (4) are respectively arranged in four installation areas.

6. The directional drilling measurement-while-drilling system according to claim 2, characterized in that, The directional probe frame (5) has two first mounting grooves on the outer wall of the end away from the vibration damper (2), and a second mounting groove is provided on the end face of the directional probe frame (5) away from the vibration damper (2). The axis of the second mounting groove coincides with the axis of the directional probe frame (5), and the axes of the two first mounting grooves are perpendicular to each other and both perpendicular to the axis of the directional probe frame (5). There are three gravimeters (3), two of which are installed in the two first mounting slots respectively, and the remaining one is installed in the second mounting slot.

7. The directional drilling measurement system according to claim 6, characterized in that, A pressure ring (51) is provided in the first mounting groove. The pressure ring (51) is connected to the directional probe frame (5) and is used to fix the gravimeter (3) located in the first mounting groove. The second mounting groove is provided with a connector (52) and a bushing (53). The connector (52) is inserted into the second mounting groove and fixedly connected to the directional probe frame (5). The bushing (53) is provided in the second mounting groove and sandwiched between the connector (52) and the gravimeter (3) located in the second mounting groove.

8. The directional drilling measurement system according to claim 3, characterized in that, The directional probe frame (5) has a third mounting groove on its end face near the vibration damper (2), and the magnetometer (4) is installed in the third mounting groove; The directional probe frame (5) has a curved cable routing groove (54) on the outer wall of the end near the vibration damper (2), and the bottom of the cable routing groove (54) has a second cable passage hole that communicates with the third mounting groove.

9. The directional drilling measurement-while-drilling system according to any one of claims 1-8, characterized in that, The outer wall of the directional probe frame (5) is also fitted with a first protective sleeve and a second protective sleeve for protecting the gravimeter (3) and the magnetometer (4).

10. The directional drilling measurement-while-drilling system according to any one of claims 1-8, characterized in that, The vibration damper (2) includes: Vibration damping sleeve (21), the inner wall of which is provided with a first annular partition (211); The vibration damping core tube (22) has a second annular partition (221) on its outer wall. The vibration damping core tube (22) is disposed inside the vibration damping sleeve (21). The first annular partition (211) and the second annular partition (221) are staggered. The gap between the damping sleeve (21) and the damping core tube (22) is filled with a damping medium, which solidifies in the gap to form a damping core with elastic properties.

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