A top drive drill string anti-loose device

Abstract

The application discloses a top drive drilling string anti-loose device, which comprises a lower drilling string, a top end of the lower drilling string being in the shape of a circular truncated cone; a threaded connection surface, the threaded connection surface being arranged on the outer surface of the top end of the lower drilling string; an upper drilling string, a bottom end of the upper drilling string being screwed on the threaded connection surface and being matched with the circular truncated cone of the lower drilling string; and an anti-loose mechanism, the anti-loose mechanism being arranged outside the outer wall of the upper drilling string and the lower drilling string. The top drive drilling string anti-loose device can avoid the disadvantages of the prior art, such as easy slippage, easy failure, complex structure, narrow application range and the like, and can ensure that the drilling string threads of other parts are not loosened when the top drive is used to release the buckle, thereby meeting the drilling process requirement of the top drive drilling device. The device has the advantages of simple structure, small number of parts, adjustable drilling string thread loosening through a rotating adjusting bolt, easy replacement of the blocking pin, reduced safety hazards of the drilling string loosening and greatly improved safety of the device.

Description

Technical Field

[0001] The invention relates to the technical field of oil drilling and geological drilling equipment, in particular to a top drive drill string anti-loosening device. Background Art

[0002] During the implementation of drilling operations, when the top drive drilling device is unbuckled, a drill string anti-loosening device is required to ensure that the threads between the drill pipe and the protection joint can be loosened, and to prevent the threads between the top drive main shaft and the internal blowout preventer, and between the internal blowout preventer and the protection joint from loosening. The device is generally composed of a tooth plate, an upper buckle, a lower buckle and a disassembly bolt. The tooth pattern of the tooth plate is a sharp device, and the tooth pattern arrangement has a certain arc shape. The back of the tooth plate is beveled. Multiple tooth plates are symmetrically installed in the bevel grooves of the inner rings of the upper buckle and the lower buckle. The upper buckle and the lower buckle are connected by the disassembly bolts. By adjusting the disassembly bolts, the tooth plate is moved toward the center of the drill string along the radial direction of the drill string. The depth of the tooth plate tooth pattern embedded in the outer peripheral surface of the joint can be adjusted to increase the friction force to achieve the purpose of preventing loosening. There is also an internal and external tooth anti-loosening device, which is connected through a gear drum and gear sleeve. First, the upper inner ten-square of the inner ten-square gear sleeve is connected to the outer ten-square of the upper part of the drill string thread, and the inner ten-square of the inner ten-square gear drum is connected to the outer ten-square of the lower part of the drill string thread. The inner sleeve with internal and external teeth is inserted into the lower half of the inner ten-square gear sleeve and the inner ten-square gear drum, so that the inner teeth of the inner ten-square gear sleeve are meshed with the outer teeth of the inner sleeve of the internal and external teeth, and the outer teeth of the inner ten-square gear drum are meshed with the inner teeth of the inner sleeve of the internal and external teeth, thereby preventing loosening by means of tooth meshing;

[0003] 1. The friction force of the tooth pattern of the tooth plate is unstable. When the shackle torque is large, the tooth plate and the outer surface of the structure are prone to slipping, resulting in loosening and failure.

[0004] 2. Short service life. In the case of sticking of the drill pipe, the large breakout torque may cause the bolts to loosen or break.

[0005] 3. The internal and external tooth anti-loosening device has a complex structure and high processing precision, but is not very versatile and has a narrow application range. In summary, how to provide a drill string anti-loosening device with a simple structure, easy disassembly and assembly, not easy to loosen, and easy to adjust the tightness is an urgent problem to be solved in this technical field. Summary of the Invention

[0006] The purpose of the present invention is to provide a top drive drill string anti-loosening device to solve the problems in the prior art that the friction force of the tooth plate teeth is unstable, the tooth plate and the outer peripheral surface of the structure are prone to slip when the unfastening torque is large, thereby loosening and failing; the service life is short, and in the case of drill rod sticking, the large unfastening torque causes the bolts to loosen or break; the internal and external tooth anti-loosening device has a complex structure, high processing precision, low versatility, and a narrow range of applicability.

[0007] To achieve the above-mentioned object, the present invention provides the following technical solution: a top drive drill string anti-loosening device, comprising:

[0008] a lower drill string, wherein the top end of the lower drill string is truncated cone-shaped;

[0009] A threaded connection surface, the threaded connection surface being provided on the outer surface of the top end of the lower drill string;

[0010] An upper drill string, the bottom end of which is screwed to the threaded connection surface and matches the frustum of the lower drill string;

[0011] The anti-loosening mechanism is arranged on the outer side of the outer wall of the upper drill string and the lower drill string.

[0012] In some feasible implementations, a circular through hole is provided in the middle portion of the upper drill string and the lower drill string.

[0013] In some feasible embodiments, the anti-loosening mechanism includes: upper hole ears, one ends of several upper hole ears are respectively fixedly connected to the outer side of the outer wall of the bottom end of the upper drill string; lower hole ears, one ends of several lower hole ears are respectively fixedly arranged on the outer side of the outer wall of the top end of the lower drill string; and a locking structure, the locking structure is arranged on several of the upper hole ears and several of the lower hole ears.

[0014] In some feasible implementations, a threaded through hole is respectively formed at the right end of several of the lower hole ears.

[0015] In some feasible implementations, a plurality of the upper hole ears and the lower hole ears are circumferentially arranged around the upper drill string and the lower drill string respectively.

[0016] In some feasible embodiments, the locking structure includes: square through holes, several of the square through holes are respectively opened on several of the upper hole ears and several of the lower hole ears; stop pins, multiple stop pins are respectively inserted in several of the square through holes; and adjustment bolts, several of the adjustment bolts are respectively screwed in several of the threaded through holes.

[0017] In some feasible implementations, the retaining pin is composed of a circular cap and a cube.

[0018] In some feasible implementations, one side of the cube is provided with an inclined surface.

[0019] Compared with the prior art, the present invention has the following beneficial effects: the top drive drill string anti-loosening device can avoid the shortcomings of the prior anti-loosening device, such as easy slipping, easy failure, complex structure, and narrow application range. When the top drive is broken out, it ensures that the threads of the drill string at other parts are not loosened, thereby meeting the drilling process requirements of the top drive drilling device.

[0020] The retaining pin of the top drive drill string anti-loosening device is inserted as a whole into the square through hole of the upper hole ear and the square through hole of the lower hole ear, and the square body of the retaining pin cooperates with the square through hole to prevent the relative loosening of the drill string thread connection surface, replacing the small area contact or tooth engagement between the original tooth plate and the anti-loosening part, and using the shear and extrusion force of the square body and the square through hole to replace the original friction force, thereby increasing the contact stress, transmitting greater torque, avoiding the loosening of the drill string thread, and improving the anti-loosening effect of the drill string thread. When replacing the protective joint, the drill string thread can be loosened by withdrawing the adjusting bolt and pulling out the retaining pin. The operation difficulty is very low and the labor intensity is also reduced.

[0021] The device has a simple structure and a small number of parts. The loosening of the drill string thread can be adjusted by rotating the adjustment bolt, the stop pin is easy to replace, the safety hazard of the loose drill string is reduced, and the safety of the device is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the main structure of the present invention;

[0024] Figure 3 This is a schematic diagram of the main cross-sectional structure of the present invention

[0025] Figure 4 It is a schematic diagram of the top view of the structure of the present invention;

[0026] Figure 5 It is a bottom view structural schematic diagram of the present invention;

[0027] Figure 6 It is a schematic diagram of a top cross-sectional structure of the present invention;

[0028] Figure 7 It is a schematic diagram of the three-dimensional structure of the stop pin of the present invention;

[0029] Figure 8 It is a schematic diagram of the main structure of the stop pin of the present invention.

[0030] In the figure: 1. lower drill string, 2. threaded connection surface, 3. upper drill string, 4. anti-loosening mechanism, 5. circular through hole, 41. upper hole ear, 42. lower hole ear, 43. locking structure, 44. threaded through hole, 431. square through hole, 432. stop pin, 433. adjustment bolt, 434. inclined surface. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] See also Figure 1-8 The present invention provides a technical solution: a top drive drill string anti-loosening device, comprising: a lower drill string 1, a threaded connection surface 2, an upper drill string 3 and an anti-loosening mechanism 4, wherein the top end of the lower drill string 1 is truncated cone-shaped; the threaded connection surface 2 is provided on the outer surface of the top end of the lower drill string 1; the bottom end of the upper drill string 3 is screwed onto the threaded connection surface 2 and matches the truncated cone of the lower drill string 1; the anti-loosening mechanism 4 is arranged on the outer side of the outer wall of the upper drill string 3 and the lower drill string 1.

[0033] In some examples, a circular through hole 5 is formed in the middle of the upper drill string 3 and the lower drill string 1 .

[0034] In some examples, the anti-loosening mechanism 4 includes: upper hole ears 41, lower hole ears 42 and a locking structure 43, one end of several upper hole ears 41 is respectively fixedly connected to the outer side of the outer wall of the bottom end of the upper drill string 3; one end of several lower hole ears 42 is respectively fixedly arranged on the outer side of the outer wall of the top end of the lower drill string 1; the locking structure 43 is placed on several upper hole ears 41 and several lower hole ears 42.

[0035] In some examples, a threaded through hole 44 is respectively defined at the right end of each of the lower hole ears 42 .

[0036] In some examples, a plurality of upper hole ears 41 and lower hole ears 42 are circumferentially arranged around the upper drill string 3 and the lower drill string 1 , respectively.

[0037] In some examples, the locking structure 43 includes: square through holes 431, stop pins 432 and adjustment bolts 433, and several square through holes 431 are respectively opened on several upper hole ears 41 and several lower hole ears 42; multiple stop pins 432 are respectively inserted in several square through holes 431; and several adjustment bolts 433 are respectively screwed on several threaded through holes 44.

[0038] In some examples, the retaining pin 432 has a circular cap and a square body.

[0039] In some examples, an inclined surface 434 is formed on one side of the cube.

[0040] Specifically, when in use, the upper drill string 3 and the lower drill string 1 that need to be prevented from loosening are connected through the threaded connection surface 2 and tightened to the value required by the process, and then the square body is inserted into the square through hole 431 of the upper hole ear 41 and the square through hole 431 of the lower hole ear 42 to form a square through hole 431 channel that passes through the top surface of the upper hole ear 41 to the bottom surface of the lower hole ear 42. At this time, after the square body is inserted into the square through hole 431 of the upper hole ear 41 and the lower hole ear 42, The threaded through hole 44 at the right end of the hole ear 42 is installed with an adjusting bolt 433 and tightened so that the threaded end surface of the adjusting bolt 433 itself presses the outer square body at the lower part of the stop pin 432. It should be noted that when installing the stop pin 432, the bottom surface of the circular cap of the stop pin 432 fits with the top surface of the upper hole ear 41, the vertical surface of the outer square body cooperates with the adjusting bolt 433, and the inclined surface 434 of the square body forms a gap with the square hole of the lower hole ear 42, that is, the entire stop pin 432 is When the screw thread is loosened, the adjusting bolt 433 is rotated to adjust the screw thread, so that the stop pin 432 is easily replaced. The safety hazard of loose drill string 3 and lower drill string 1 is reduced, and the safety of the device is greatly improved. At the same time, in order to achieve the fastening effect of upper drill string 3 and lower drill string 1, a threaded hole is opened at the left end of the upper hole ear 41, and the adjusting bolt is screwed into the threaded hole of the upper hole ear 41. The bolts on the upper hole ear 41 and the lower hole ear 42 are in relative directions, which makes the connection between the upper drill string 3 and the lower drill string 1 more stable.

[0041] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "two ends" and the like to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation; at the same time, unless otherwise clearly specified and limited, the terms "setting", "installation", "connection", "fixed installation" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be internal communication between two elements or an interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to specific circumstances.

[0042] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A top drive drill string anti-loosening device, characterized in that: include: A lower drill string (1), wherein the top end of the lower drill string (1) is truncated cone-shaped; A threaded connection surface (2), the threaded connection surface (2) being provided on the outer surface of the top end of the lower drill string (1); An upper drill string (3), the bottom end of which is screwed onto the threaded connection surface (2) and matches the frustum of the lower drill string (1); An anti-loosening mechanism (4), the anti-loosening mechanism (4) being arranged on the outer side of the outer wall of the upper drill string (3) and the lower drill string (1); A circular through hole (5) is provided in the middle of the upper drill string (3) and the lower drill string (1); The anti-loosening mechanism (4) comprises: Upper hole ears (41), one end of a plurality of the upper hole ears (41) is respectively fixedly connected to the outer side of the outer wall of the bottom end of the upper drill string (3); Lower hole ears (42), one end of a plurality of the lower hole ears (42) is respectively fixedly arranged on the outer side of the outer wall of the top end of the lower drill string (1); A locking structure (43), wherein the locking structure (43) is disposed on a plurality of the upper hole ears (41) and a plurality of the lower hole ears (42); The right ends of the plurality of lower hole ears (42) are respectively provided with threaded through holes (44); A plurality of upper hole ears (41) and lower hole ears (42) are respectively arranged circumferentially around the upper drill string (3) and the lower drill string (1); The locking structure (43) comprises: Square through holes (431), wherein a plurality of the square through holes (431) are respectively provided on a plurality of the upper hole ears (41) and a plurality of the lower hole ears (42); Stop pins (432), wherein a plurality of the stop pins (432) are respectively inserted into a plurality of the square through holes (431); Adjusting bolts (433), wherein a plurality of the adjusting bolts (433) are respectively screwed on a plurality of the threaded through holes (44); The stop pin (432) is composed of a circular cap and a square body; An inclined surface (434) is provided on one side of the cube.

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