Centralizer and MWD directional probe system

Abstract

The utility model belongs to directional drilling technical field discloses a centralizer and while drilling surveying directional probe pipe system. The centralizer includes centralizer framework, rotating sleeve and centralizer wing plate. Among them, the outer wall of centralizer framework is provided with first limit step, and the upper end of centralizer framework is connected with compression cylinder, and the lower end of centralizer framework is connected with surveying probe pipe. Rotating sleeve is rotatably arranged on the outer wall of centralizer framework, and one end of rotating sleeve is in abutment with first limit step, and the other end of rotating sleeve is in abututment with surveying probe pipe. The centralizer wing plate is provided with at least three, three centralizer wing plates are spaced apart and arranged on the outer wall of rotating sleeve along the circumferential direction of rotating sleeve, and the centralizer wing plate is used for abutting with the well wall, so that the centralizer and while drilling surveying directional probe pipe system are centered in the well. When the centralizer contacts with the cuttings bed or sand bridge in the well, the resistance of centralizer wing plate can be realized by rotating sleeve, and then the advancing resistance of while drilling surveying directional probe pipe system in the well is reduced.

Description

Technical Field

[0001] This utility model relates to the field of directional drilling technology, and in particular to a centralizer and a directional drilling 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] To ensure the directional drilling system remains centered within the well, a centralizer is typically installed. In existing technologies, the centralizer generally includes a centralizer frame and centralizer flanges fixed to the outer wall of the frame. These flanges contact the wellbore to maintain the overall centeredness of the directional drilling system. However, when the measurement-while-drilling (MWD) equipment encounters cuttings beds formed by sediment deposition in the low-velocity annulus or sand bridges formed by the accumulation of large rock fragments after shale absorbs water and expands, the centralizer flanges come into contact with these cuttings beds and sand bridges, increasing the MWD equipment's travel resistance. Utility Model Content

[0004] The present invention provides a stabilizer and a drilling measurement-while-drilling directional probe system, which can reduce forward resistance.

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

[0006] central stabilizers, including:

[0007] The frame is straightened, and a first limiting step is provided on the outer wall of the frame.

[0008] A rotating sleeve is rotatably fitted onto the outer wall of the straightening frame, with one end of the rotating sleeve abutting against the first limiting step and the other end being limited by a measuring probe connected to the lower end of the straightening frame.

[0009] At least three straightening wing plates are provided, and the three straightening wing plates are spaced apart along the circumferential direction of the rotating sleeve on the outer wall of the rotating sleeve.

[0010] In one embodiment, the straightening wing includes a straightening connecting part and a straightening abutting part connected to each other, the straightening abutting part being used to abut against the well wall;

[0011] The outer wall of the rotating sleeve is provided with at least three snap-fit ​​grooves that correspond one-to-one with the straightening wing plate, and the straightening connection part snaps into the corresponding snap-fit ​​groove.

[0012] In one embodiment, the cross-sectional area of ​​the straightening connection and the cross-sectional area of ​​the snap-fit ​​groove gradually increase in the direction from the straightening wing plate to the rotating sleeve.

[0013] In one embodiment, the snap-fit ​​groove is filled with adhesive, and the straightening connection is bonded to the snap-fit ​​groove by the adhesive.

[0014] In one embodiment, the straightener further includes at least two first sealing rings disposed between the rotating sleeve and the straightening frame, with the two first sealing rings respectively located inside the two ends of the rotating sleeve.

[0015] In one embodiment, the upper end of the straightening frame is connected to a pressure-resistant cylinder;

[0016] The straightener also includes a second sealing ring disposed between the pressure-resistant cylinder and the straightening frame, the second sealing ring being located inside the end of the pressure-resistant cylinder facing the straightening frame; and

[0017] A third sealing ring is disposed between the measuring probe and the straightening frame, the third sealing ring being located inside the end of the measuring probe facing the straightening frame.

[0018] In one embodiment, both the second sealing ring and the third sealing ring are provided in multiples.

[0019] In one embodiment, the straightening wing is made of rubber.

[0020] In one embodiment, the straightening frame is provided with an axial through hole;

[0021] The centralizer also includes a sealing connector disposed within the axial through hole, the sealing connector being configured to secure the cable and seal the axial through hole.

[0022] The measurement-while-drilling directional probe system includes the centralizer described in any of the above schemes.

[0023] The beneficial effects of this utility model are as follows:

[0024] The centralizer provided by this utility model allows the centralizer blades to rotate by rotating the sleeve when they come into contact with the cuttings bed or sand bridge in the well. This better adapts to the well environment and reduces the travel resistance of the measurement-while-drilling directional pipe system in the well. In addition, by setting a first limiting step on the outer wall of the centralizer frame, the first limiting step, in conjunction with the measurement pipe, achieves axial limiting of the rotating sleeve, allowing the rotating sleeve to only rotate. The structure is simple and the overall cost is low. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the straightening device provided in this embodiment of the utility model;

[0026] Figure 2 This is a cross-sectional view of the straightening device provided in this embodiment of the utility model;

[0027] Figure 3 This is a cross-sectional view of the straightening wing plate involved in the embodiment of this utility model;

[0028] Figure 4 This is a cross-sectional view of the rotating sleeve involved in the embodiment of this utility model.

[0029] In the picture:

[0030] 1. Straighten the frame; 11. Axial through hole; 12. First limiting step; 13. Second limiting step;

[0031] 2. Rotate the sleeve; 21. Engage the groove;

[0032] 3. Straighten the wing plate; 31. Straighten the connecting part; 32. Straighten the abutment part;

[0033] 4. First sealing ring;

[0034] 5. Second sealing ring;

[0035] 6. Third sealing ring;

[0036] 7. Sealed connector;

[0037] 8. Secure the nuts;

[0038] 9. Aviation socket. Detailed Implementation

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] like Figures 1-2 As shown, this embodiment of the invention provides a centralizer and a measurement-while-drilling (MWD) directional pipe system. The centralizer is used to center the MWD directional pipe system within the well. The MWD directional pipe system includes the aforementioned centralizer, a pressure-resistant cylinder connected to the upper end of the centralizer, and a measurement pipe connected to the lower end of the centralizer. The MWD directional pipe system reduces travel resistance by incorporating a centralizer.

[0044] Specifically, the centralizer includes a centralizing frame 1, a rotating sleeve 2, and centralizing wing plates 3. The outer wall of the centralizing frame 1 is provided with a first limiting step 12, and a pressure-resistant cylinder is connected to the upper end of the centralizing frame 1, while a measuring probe is connected to the lower end. The rotating sleeve 2 is rotatably mounted on the outer wall of the centralizing frame 1, with one end abutting against the first limiting step 12 and the other end abutting against the measuring probe. The first limiting step 12 and the measuring probe limit the rotating sleeve on the centralizing frame 1, preventing axial movement and allowing the rotating sleeve 2 to rotate only. At least three centralizing wing plates 3 are provided, spaced apart along the circumference of the rotating sleeve 2 on its outer wall. The centralizing wing plates 3 abut against the wellbore to center the measurement-while-drilling directional drilling system within the well.

[0045] When the centralizer comes into contact with the cuttings bed or sand bridge in the well, the centralizer blade 3 is resisted and can rotate by rotating sleeve 2 to better adapt to the well environment, thereby reducing the travel resistance of the measurement-while-drilling directional pipe system in the well. In addition, by setting a first limiting step 12 on the outer wall of the centralizer frame 1, the first limiting step 12, together with the measurement pipe, realizes the axial limitation of the rotating sleeve 2, so that the rotating sleeve 2 can only rotate, and the structure is simple and the overall cost is low.

[0046] It is understandable that by setting the straightening wing plate 3 on the rotating sleeve 2 and rotating the rotating sleeve 2 to the straightening frame 1, the straightening wing plate 3 and the rotating sleeve 2 are more convenient to disassemble, and the replacement and maintenance are more convenient and quick.

[0047] Optionally, such as Figures 3-4 As shown, the straightening wing plate 3 includes a straightening connecting part 31 and a straightening abutting part 32 connected to each other. The straightening abutting part 32 is used to abut against the well wall. The outer wall of the rotating sleeve 2 is provided with at least three snap-fit ​​grooves 21, each corresponding to one of the straightening wing plates 3. The straightening connecting part 31 snaps into the corresponding snap-fit ​​groove 21. This structure achieves the connection between the straightening wing plate 3 and the rotating sleeve 2 through snap-fit, making the installation of the straightening wing plate 3 simple and convenient.

[0048] Furthermore, in order to ensure a firm connection between the straightening connection 31 and the locking groove 21, both the longitudinal section of the straightening connection 31 and the longitudinal section of the locking groove 21 are trapezoidal. Moreover, from the direction of the straightening wing plate 3 to the rotating sleeve 2, the cross-sectional area of ​​the straightening connection 31 and the cross-sectional area of ​​the locking groove 21 gradually increase. That is, the opening area of ​​the locking groove 21 is smaller than the bottom area of ​​the locking groove 21. When the straightening connection 31 is locked in the locking groove 21, the small opening area of ​​the locking groove 21 can effectively limit the straightening connection 31, thereby reducing the probability of the straightening connection 31 coming off.

[0049] Optionally, when the straightening connector 31 engages with the locking groove 21, adhesive can be filled into the locking groove 21. The straightening connector 31 engages within the locking groove 21, and the adhesive can further bond the straightening connector 31 and the locking groove 21 together, thereby achieving simultaneous engagement and bonding of the straightening connector 31 and the locking groove 21, further improving the connection strength between the straightening wing plate 3 and the rotating sleeve 2. Alternatively, the straightening connector 31 can also be connected to the locking groove 21 by vulcanization.

[0050] To prevent mud and other particles from entering between the rotating sleeve 2 and the straightening frame 1, such as Figure 2 As shown, the centralizer also includes at least two first sealing rings 4 disposed between the rotating sleeve 2 and the centralizing frame 1. The two first sealing rings 4 are respectively located inside the two ends of the rotating sleeve 2, so that the two first sealing rings 4 respectively seal the two ends of the rotating sleeve 2, preventing mud and other particles from entering between the rotating sleeve 2 and the centralizing frame 1, thus avoiding abnormal wear of the rotating sleeve 2 and the centralizing frame 1. Of course, more than one first sealing ring 4 can be disposed inside each end of the rotating sleeve 2; the number of first sealing rings 4 is not limited here.

[0051] In this embodiment, to prevent mud and other particles from entering the pressure-resistant cylinder or the measuring probe, the centralizer also includes a second sealing ring 5 and a third sealing ring 6. The second sealing ring 5 is disposed between the pressure-resistant cylinder and the centralizer frame 1, and is located at the end of the pressure-resistant cylinder facing the centralizer frame 1. The second sealing ring 5 effectively prevents mud particles from entering the pressure-resistant cylinder, avoiding abnormal wear. The third sealing ring 6 is disposed between the measuring probe and the centralizer frame 1, and is located at the end of the measuring probe facing the centralizer frame 1. The third sealing ring 6 effectively prevents mud and other particles from entering the measuring probe, avoiding abnormal wear.

[0052] Furthermore, multiple second sealing rings 5 ​​and multiple third sealing rings 6 can be provided. Providing multiple second sealing rings 5 ​​inside the pressure-resistant cylinder can further improve the sealing performance of the pressure-resistant cylinder, and providing multiple third sealing rings 6 inside the measuring probe can further improve the sealing performance of the measuring probe. In this embodiment, two of each of the second sealing rings 5 ​​and the third sealing rings 6 are provided.

[0053] Optionally, the straightening wing 3 is a rubber component made of rubber. The rubber component can avoid hard collision with the well wall and reduce the probability of failure.

[0054] In this embodiment, the straightening frame 1 is provided with an axial through hole 11. When the lower end of the straightening frame 1 enters the mud, in order to prevent the mud from passing through the axial through hole 11, the straightening device also includes a sealing connector 7 disposed in the axial through hole 11. The sealing connector 7 is disposed in the axial through hole 11 and is used to block the axial through hole 11. The cable passing through the axial through hole 11 can also pass through the sealing connector 7 so that the sealing connector 7 can fix the cable to avoid damage to the cable due to force transmission.

[0055] Furthermore, a second limiting step 13 is provided inside the axial through hole 11, and an internal thread is also provided on the inner wall of the axial through hole 11. The sealing connector 7 is disposed inside the axial through hole 11 and abuts against the second limiting step 13. The straightener includes a fixing nut 8 that is screwed into the internal thread of the axial through hole 11. The fixing nut 8 can press against the side of the sealing connector 7 away from the second limiting step 13 to achieve the fixed installation of the sealing connector 7.

[0056] In this embodiment, the straightener also includes an aviation socket 9 disposed at the lower end of the straightening frame 1. The aviation socket 9 is disposed inside the measuring probe and is used for communication connection with the instrument inside the measuring probe.

[0057] 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.

[0058] 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 centralizer, characterized in that, include: The straightening frame (1) is provided with a first limiting step (12) on its outer wall; Rotary sleeve (2) is rotatably fitted on the outer wall of the straightening frame (1), and one end of the rotating sleeve (2) abuts against the first limiting step (12), while the other end is limited by a measuring probe connected to the lower end of the straightening frame (1). At least three straightening wing plates (3) are provided, and the three straightening wing plates (3) are spaced apart on the outer wall of the rotating sleeve (2) along the circumferential direction.

2. The centralizer according to claim 1, characterized in that, The straightening wing plate (3) includes a straightening connecting part (31) and a straightening abutting part (32) connected to each other, and the straightening abutting part (32) is used to abut against the well wall; The outer wall of the rotating sleeve (2) is provided with at least three snap-fit ​​grooves (21) that correspond one-to-one with the straightening wing plate (3), and the straightening connection part (31) is snapped into the corresponding snap-fit ​​groove (21).

3. The centralizer according to claim 2, characterized in that, From the straightening wing plate (3) to the rotating sleeve (2), the cross-sectional area of ​​the straightening connection part (31) and the cross-sectional area of ​​the snap-fit ​​groove (21) gradually increase.

4. The centralizer according to claim 3, characterized in that, The snap-fit ​​groove (21) is filled with glue, and the straightening connection part (31) is bonded to the snap-fit ​​groove (21) by the glue.

5. The centralizer according to claim 1, characterized in that, The straightener also includes at least two first sealing rings (4) disposed between the rotating sleeve (2) and the straightening frame (1), with the two first sealing rings (4) located at the two ends of the rotating sleeve (2).

6. The centralizer according to claim 1, characterized in that, The upper end of the straightening frame (1) is connected to a pressure-resistant cylinder; The straightener also includes a second sealing ring (5) disposed between the pressure-resistant cylinder and the straightening frame (1), the second sealing ring (5) being located inside the end of the pressure-resistant cylinder facing the straightening frame (1); and A third sealing ring (6) is disposed between the measuring probe and the straightening frame (1), the third sealing ring (6) being located inside the end of the measuring probe facing the straightening frame (1).

7. The centralizer according to claim 6, characterized in that, Both the second sealing ring (5) and the third sealing ring (6) are provided in multiples.

8. The centralizer according to any one of claims 1-7, characterized in that, The straightening wing plate (3) is made of rubber.

9. The centralizer according to any one of claims 1-7, characterized in that, The straightening frame (1) is provided with an axial through hole (11); The centralizer also includes a sealing connector (7) disposed within the axial through hole (11), the sealing connector (7) being configured to secure the cable and seal the axial through hole (11).

10. A directional drilling measurement-while-drilling system, characterized in that, The corrective device includes any one of claims 1-9.

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