Adjustable drilling centralizer

Abstract

The utility model relates to the technical field of well drilling, in particular to an adjustable well drilling centralizer which comprises a supporting body, an upper shaft body is arranged at the top end of the supporting body, a lower shaft body is arranged at the bottom end of the supporting body, and a movable cavity is formed in the supporting body. A plurality of vertical linear openings are evenly formed in the surface of the movable cavity in the circumferential direction at intervals, and a centralizing fin is arranged in each opening in a sliding mode. The extension length of the centralizing fins is adjusted by rotating the lead screw, so that the diameter of the centralizer can be flexibly adjusted according to different well sizes, the centralizer is suitable for various wells of different specifications, the time and cost for replacing equipment are reduced, and the operation efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of drilling, especially to adjustable drilling centralizer. BACKGROUND

[0002] In the exploitation process of oil, natural gas and geothermal resources, drilling operation is one of the key links. In order to ensure that the drill bit advances along the predetermined trajectory and reduce the wear and tear on the well wall, drilling centralizers are widely used in drilling pipe columns. With the progress of technology, modern drilling centralizers not only need to have basic functions, but also need to meet higher requirements, such as adjustable diameter to adapt to different sizes of wellways, enhanced wear resistance, and simplified operation and maintenance process. These improvements are of great significance to improve the overall efficiency of drilling operations, reduce costs and ensure operation safety.

[0003] The patent with the patent authorization announcement number CN217999510U discloses a centralizer for oil drilling. The centralizer is fixedly connected with the connecting screw pipe through the lower shaft body, and the connecting screw pipe is threadedly connected with the upper shaft body, realizing the stable combination between the components. The chuck is arranged on the lower shaft body and the upper shaft body, and the opposite side surfaces of the chuck are provided with rotating grooves. The support is rotatably clamped through the two rotating grooves. This design allows the centralizer to be inserted into the well after being installed into the drill pipe column for use. The support contacts and remains stable with the well wall and does not rotate with the drill pipe column, thereby reducing the wear and tear caused by the sliding friction between the support and the well wall. In addition, when the support needs to be replaced or repaired, the support can be easily taken out for replacement by rotating the lower shaft body to release the threaded connection between the lower shaft body and the upper shaft body. This can effectively maintain the worn parts of the centralizer, improve its service life and reduce the use cost. However, although the patent improves the functionality of the centralizer in some aspects, it has the limitation of fixed diameter, which is only suitable for wellways of specific sizes, resulting in the need to replace different centralizers when facing wellways of different diameters or directional drilling requirements, thereby increasing the operation cost and prolonging the operation period.

[0004] Therefore, it is urgent to provide a drilling centralizer with adjustable diameter function. UTILITY MODEL CONTENT

[0005] In order to overcome the shortcomings of the existing patent that the diameter of the centralizer is fixed and only suitable for wellways of specific sizes, the utility model provides a drilling centralizer with adjustable diameter function.

[0006] To achieve the above problems, the utility model discloses the following technical scheme: a adjustable well drilling centralizer, including the support body, the support body top is provided with the upper shaft body, the support body bottom is provided with the lower shaft body, the support body inside is equipped with an activity cavity, the activity cavity surface is evenly spaced apart and is provided with a plurality of vertical one word opening along the circumference, each opening is slidably provided with the centralizing fin, the centralizing fin middle position is equipped with the wedge structure, the activity cavity is screw -threaded and is provided with the lead screw in the upper portion, the lead screw bottom is installed with the extrusion head, the extrusion head is directly on the wedge structure of centralizing fin, each centralizing fin both sides position is provided with the guide rod, the guide rod one end is fixed in the activity cavity inner wall, and the other end is slidably connected with the centralizing fin, and the spring is set on each guide rod, and the spring both ends are connected respectively with the centralizing fin and the activity cavity inner wall.

[0007] Further, the support body is designed as a shuttle structure.

[0008] Further, the upper shaft body and the lower shaft body are internally provided with a threaded structure.

[0009] Further, the support body and the centralizing fin surface are coated with a wear-resistant coating.

[0010] Further, the lead screw top end is provided with a clamping groove, the clamping groove is clamped with a clamping block, the clamping block is fixedly connected with a connecting rod, and the connecting rod top end is fixedly connected with a rotating disc.

[0011] Further, the support body surface is fixedly installed with a plurality of connecting blocks through screws, the plurality of connecting blocks are located in the gap between the centralizing fins, the connecting blocks are provided with scrapers on both sides, and the scrapers are in close contact with the adjacent centralizing fins.

[0012] Further, the lower end edge of each centralizing fin is provided with a crushing blade.

[0013] Further, the rotating disc top is provided with an anti-skid handle.

[0014] Compared with the prior art, the utility model has the following technical effects: 1, by rotating the lead screw to adjust the extension length of the centralizing fin, so that the centralizer can be flexibly adjusted in diameter according to different well size, suitable for various different specifications of well, reduces the time and cost of replacing equipment, improves the operation efficiency.

[0015] 2, through the clamping block, the connecting rod and the rotating disc, a connecting lead screw assembly is formed, which facilitates the operator to operate the lead screw to debug the size of the centralizer, and such design not only reduces the operation difficulty, but also improves the convenience and efficiency of operation.

[0016] 3. By increasing the setting of the scraper, the surface adhered soil and other impurities can be automatically removed in the process of each extension or retraction of the righting wing piece, the accumulation of sand and other impurities is prevented, the abrasion is reduced and the functional effectiveness of the righting wing piece is maintained, so that the service life of the equipment is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a three-dimensional structure schematic view of the utility model.

[0018] Figure 2 It is a three-dimensional sectional view of support body, upper shaft body and lower shaft body and other parts of the utility model.

[0019] Figure 3 It is a three-dimensional structure schematic view of the utility model screw rod and extrusion head parts.

[0020] Figure 4 It is a partial sectional view of the utility model guide rod, spring and righting wing piece and other parts.

[0021] Figure 5 It is a three-dimensional structure schematic view of the utility model clamping block, connecting rod and rotating disc and other parts.

[0022] Figure 6 It is a three-dimensional sectional view of the utility model connecting block, screw and scraper and other parts.

[0023] In the above drawing: 1, support body, 2, upper shaft body, 201, lower shaft body, 3, screw rod, 4, extrusion head, 5, guide rod, 6, spring, 7, righting wing piece, 8, threaded structure, 9, clamping block, 10, connecting rod, 11, rotating disc, 12, connecting block, 13, screw, 14, scraper, 15, crushing blade, 16, anti-skid handle. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the utility model more clear and obvious, the utility model is further described in detail below in combination with specific implementation manners and with reference to the drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the utility model. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concept of the utility model.

[0025] Example 1: please refer to Figures 1-4The application discloses an adjustable drilling centralizer, which comprises a supporting body 1, the top end of the supporting body 1 is provided with an upper shaft body 2 for connecting a drill rod, the bottom end of the supporting body 1 is provided with a lower shaft body 201 for connecting a drill bit and other drilling equipment, the inside of the supporting body 1 is provided with a movable cavity, the surface of the movable cavity is uniformly and circumferentially spaced apart to be provided with four vertical one-letter openings, each opening is slidably provided with a centralizing wing piece 7, the centralizing wing piece 7 can be extended outwards along the vertical one-letter opening or be retracted inwards into the movable cavity, so that the size of the centralizer is adjusted, the middle position of each centralizing wing piece 7 is provided with a wedge structure, the upper part of the movable cavity is screwedly provided with a lead screw 3, the bottom end of the lead screw 3 is provided with a pressing head 4, the pressing head 4 directly acts on the wedge structure on the centralizing wing piece 7, the pressing head 4 can be moved up and down by rotating the lead screw 3, so as to control the extension and retraction of the centralizing wing piece 7, the both sides of each centralizing wing piece 7 are provided with guide rods 5, one end of the guide rod 5 is fixed to the inner wall of the movable cavity, the other end of the guide rod 5 is slidably connected with the centralizing wing piece 7, so as to provide a guiding effect and ensure that the centralizing wing piece 7 can only move in a predetermined direction, the guide rod 5 is provided with a spring 6, the both ends of the spring 6 are connected with the centralizing wing piece 7 and the inner wall of the movable cavity respectively, so as to provide a rebound force for the centralizing wing piece 7 and help the centralizing wing piece 7 to be automatically retracted without external pressure, the lower end edge of each centralizing wing piece 7 is provided with a broken blade 15, the broken blade 15 is mainly designed to cut and break small obstacles or hard deposits encountered in the drilling process, so as to reduce the influence of the obstacles on the normal work of the centralizing wing piece 7.

[0026] In the preparation stage, the size of the centralizer is adjusted according to the specific size of the shaft, the pressing head 4 is moved downwards by rotating the lead screw 3, the centralizing wing piece 7 is expanded outwards by the pressing head 4, the centralizing wing piece 7 is moved horizontally along the guide rod 5 under the pressure of the pressing head 4 and the spring 6 is compressed, when the centralizing wing piece 7 reaches the appropriate expanded position, the rotation of the lead screw 3 is stopped, at this moment, the pressing head 4 keeps the pressure on the wedge structure and prevents the centralizing wing piece 7 from retracting, after the size adjustment is completed, the overall installation of the centralizer is completed by the threaded connection between the upper shaft body 2 and the drill rod and the lower shaft body 201 and the drill bit, in the actual operation, the centralizing wing piece 7 stabilizes the direction of the drill rod by contacting the shaft wall, and provides a fulcrum and increases the friction force, so that the drill bit can work in a more stable state.

[0027] Example 2: on the basis of example 1, please refer to Figure 5 , the top end of the lead screw 3 is provided with a clamping groove, the clamping groove is clamped with a clamping block 9, the clamping block 9 is fixedly connected with a connecting rod 10, the top end of the connecting rod 10 is fixedly connected with a rotating disc 11, the top of the rotating disc 11 is provided with an anti-skid handle 16, the anti-skid handle 16 provides a safer and more comfortable holding point for the operator.

[0028] When the size of the centralizer is adjusted, the connecting rod 10 with the clamping block 9 is clamped into the clamping groove at the top end of the screw rod 3, and the stable connection between the connecting rod 10 and the screw rod 3 is ensured, and after the connecting rod 10 is installed, the operator drives the connecting rod 10 to rotate by rotating the rotating disc 11 at the top end of the connecting rod 10, and then drives the screw rod 3 to rotate, so that the operator can conveniently operate the screw rod 3, and the convenience and efficiency of operation are improved, and after the adjustment of the centralizer is completed, the connecting rod 10 needs to be disassembled from the screw rod 3.

[0029] Please refer to Figure 6 The four connecting blocks 12 are fixedly installed on the surface of the support body 1 through screws 13, and the four connecting blocks 12 are located in the gaps between the centralizing wings 7, respectively, and the scraping knives 14 are arranged on the left and right sides of the connecting blocks 12, and the scraping knives 14 are in close contact with the adjacent centralizing wings 7.

[0030] Since the centralizing wings 7 are in contact with the scraping knives 14, the scraping knives 14 can automatically remove the dirt and other impurities attached to the surface of the centralizing wings 7 during the extension or retraction of the centralizing wings 7 each time, so that the accumulation of dirt and other impurities is prevented, and the centralizing wings 7 can always keep clean, thereby ensuring the effectiveness of the function.

[0031] Please refer to Figure 1 and Figure 2 The support body 1 is designed as a shuttle-shaped structure, the shuttle-shaped support body 1 can better adapt to the requirements of fluid dynamics and reduce the moving resistance in the drilling fluid, the screw thread structure 8 is arranged in the upper shaft body 2 and the lower shaft body 201, the design of the screw thread structure 8 facilitates the quick and stable connection between the device and the drill pipe, the drill bit and the like, and the support body 1 and the centralizing wings 7 are coated with a wear-resistant coating, thereby increasing the service life of the device and reducing the wear caused by friction during use.

[0032] The embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge range of those skilled in the art without departing from the purpose of the utility model.

Claims

1. An adjustable drilling centralizer, comprising a support body (1), the top end of the support body (1) is provided with an upper shaft body (2), the bottom end of the support body (1) is provided with a lower shaft body (201), the inside of the support body (1) is provided with a movable cavity, the surface of the movable cavity is uniformly and circumferentially spaced apart to be provided with a plurality of vertical one-letter openings, each opening is slidably provided with a centralizing fin (7), and the middle position of each centralizing fin (7) is provided with a wedge structure, characterized in that, The upper part of the movable cavity is provided with a screw rod (3) in a threaded manner, the bottom end of the screw rod (3) is provided with an extrusion head (4), the extrusion head (4) directly acts on a wedge structure on a righting fin (7), both sides of each righting fin (7) are provided with a guide rod (5), one end of the guide rod (5) is fixed to the inner wall of the movable cavity, the other end is in sliding connection with the righting fin (7), a spring (6) is sleeved on each guide rod (5), and both ends of the spring (6) are connected with the righting fin (7) and the inner wall of the movable cavity respectively.

2. An adjustable drilling centralizer according to claim 1, wherein, The support body (1) is designed as a shuttle-shaped structure.

3. An adjustable drilling centralizer according to claim 2, wherein, The upper shaft body (2) and the lower shaft body (201) are both internally provided with a threaded structure (8).

4. An adjustable drilling centralizer according to claim 3, wherein, The surface of the support body (1) and the righting fin (7) is coated with a wear-resistant coating.

5. An adjustable drilling centralizer according to claim 4, wherein, The top end of the screw rod (3) is provided with a clamping groove, a clamping block (9) is clamped in the clamping groove, the clamping block (9) is fixedly connected with a connecting rod (10), and the top end of the connecting rod (10) is fixedly connected with a rotating disc (11).

6. An adjustable drilling centralizer according to claim 5, wherein, A plurality of connecting blocks (12) are fixedly installed on the surface of the support body (1) through screws (13), the plurality of connecting blocks (12) are located in the gaps between the righting fins (7) respectively, scraping knives (14) are arranged on both sides of the connecting block (12), and the scraping knives (14) are in close contact with the adjacent righting fins (7).

7. An adjustable drilling centralizer according to claim 6, wherein, The lower end edge of each righting fin (7) is provided with a crushing blade (15).

8. An adjustable drilling centralizer according to claim 7, wherein, The rotating disc (11) is provided with an anti-skid handle (16) on the top.

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