Oilfield exploitation screw drill

Abstract

The utility model relates to the technical field of oil fields, in particular to an oil field exploitation screw drill which comprises a transmission shaft, an upper universal joint shell, a sealing piece and a second ball angle shaft, one end of the transmission shaft is sleeved with the upper universal joint shell, a reducing coupling is arranged in one end of the upper universal joint shell, and the other end of the upper universal joint shell is sleeved with a second ball angle shaft. A second ball angle shaft is arranged on the outer side of the reducing coupling, a ball seat is arranged on the inner side of the end, away from the transmission shaft, of the upper universal joint shell, the periphery of the ball seat is connected with a second ball angle pressing cap through threads, the second ball angle pressing cap is connected with the second ball angle shaft in a sleeving mode, and a second steel ball is arranged between the ball seat and the second ball angle shaft. A sealing piece is arranged in a groove in the convex spherical surface of the second spherical angle shaft in a sleeving manner; the requirement for a large bending point of a large-displacement well can be met, meanwhile, due to the hinged structural design, circumferential torsion at the hinged position is effectively enhanced, the total length of a drilling tool is not shortened, power needed by the drilling tool is guaranteed, and therefore the using effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil fields, and particularly relates to a screw drill for oil field exploitation. Background Art

[0002] Oil exploitation refers to the act of excavating and extracting oil in places where oil is stored. During the process of oil exploitation, the driving mode of oil and gas flowing from the reservoir into the bottom of the well and then rising from the bottom of the well to the wellhead. When conducting oil field exploitation operations, it is usually necessary to operate with a screw drill in cooperation with exploitation equipment, and the quality and effect of the use of the screw drill determine the exploitation efficiency.

[0003] Currently, when using exploitation drills, in many oil and gas wells in China, the exploitation has reached the later stage, with a low exploitation volume and a large exploitation difficulty. For the existing screw drills, the maximum single-bend angle can only reach 3°, and the maximum coaxial double-bend angle reaches 3 + 1.5°. They can no longer meet the exploitation requirements of extended-reach wells. Moreover, as the bend angle increases, the total length of the drill needs to be shortened - the inner diameter of the wellbore is fixed and cannot be enlarged. At the same time, with the increase of the bend angle, the risk of the drill being twisted off is greater. At the same time, it is also necessary to ensure the torque required for drilling. Therefore, a screw drill for oil field exploitation is proposed, which can not only meet the requirements of a large bend point in extended-reach wells, but also the articulated structure design effectively enhances the circumferential torsion force at the articulated part, and the total length of the drill is not shortened, ensuring the power required for the drill, thereby improving the use effect. Content of the Utility Model

[0004] Aiming at the problems in the prior art, the utility model provides a screw drill for oil field exploitation, which can meet the requirements of a large bend point in extended-reach wells, and at the same time, the articulated structure design effectively enhances the circumferential torsion force at the articulated part, thereby improving the use effect.

[0005] The technical solution adopted by the utility model to solve its technical problems is a screw drill for oil field exploitation, which includes a transmission shaft, an upper universal joint housing, a seal, and a second spherical angular shaft. One end of the transmission shaft is sleeved with the upper universal joint housing. A reduced-diameter collar is arranged inside one end of the upper universal joint housing. A second spherical angular shaft is arranged outside the reduced-diameter collar. A ball seat is arranged inside the end of the upper universal joint housing far from the transmission shaft. The periphery of the ball seat is connected with a second spherical angular pressure cap by threads, and the second spherical angular pressure cap is sleeved and connected with the second spherical angular shaft. A second steel ball is arranged between the ball seat and the second spherical angular shaft. The seal is sleeved in the groove on the convex spherical surface of the second spherical angular shaft;

[0006] A spherical angular shaft is arranged on the periphery of one end of the transmission shaft inside the upper universal joint housing. A spherical angular pressure cap is sleeved on the periphery of the spherical angular shaft at the other end of the upper universal joint housing. A steel ball is arranged between the spherical angular pressure cap and the spherical angular shaft.

[0007] By adopting the above technical solutions, not only can the requirements of large displacement wells with large bending points be met, but also the articulated structure design effectively enhances the circumferential torsion force at the hinge, and the total length of the drill string is not shortened, ensuring the required power of the drill string.

[0008] Specifically, the transmission shaft includes a combined water cap. An outer universal joint housing is arranged around the combined water cap. A connecting rod is rotatably connected to the inner side of the transmission shaft. A lower lock nut is arranged at one end of the combined water cap inside the outer universal joint housing. A ball pad is arranged at the bottom of the connecting rod inside the outer universal joint housing and the transmission shaft. A rubber sleeve is arranged between the lower lock nut and the combined water cap.

[0009] By adopting the above technical solutions, the outer universal joint housing can be articulated to the rotating shaft, improving the flexibility of use.

[0010] Specifically, a check screw corresponding to the steel ball is arranged on the outer side of the ball angle compression cap through a reserved hole. A sealing ring is sleeved in the groove on the convex spherical surface of the ball angle shaft. A pin is arranged on the outer side of the transmission shaft and penetrates through the upper universal joint housing. The outer side of the upper universal joint housing is connected to a second pin through a slot, and the second pin penetrates through the ball seat.

[0011] By adopting the above technical solutions, it can not only play a positioning role but also enhance the axial torsion force of the hinge.

[0012] Specifically, a stator is arranged around the upper universal joint housing. A corresponding rotor is arranged inside the stator. A live hinge is arranged on one side of the rotor. A steel ball is arranged at the bottom of the live hinge. A second ball pad is arranged around the steel ball. An upper lock nut is arranged on one side of the live hinge. A pressure ring is arranged between the upper lock nut and the live hinge.

[0013] By adopting the above technical solutions, it is convenient to carry out articulated connection treatment at the connection of the upper universal joint housing, thereby improving the flexibility of use. And there is a ball-type universal shaft in the articulated inner hole at this place. The function of the ball-type universal shaft is to transmit the torque and speed generated by the motor to the transmission shaft of the bearing assembly and the drill bit, and it converts the planetary motion of the rotor into the fixed-axis rotation of the transmission shaft.

[0014] Specifically, a transmission shaft housing is sleeved around the transmission shaft. A lower inner TC is arranged on the outer surface of the transmission shaft inside the transmission shaft housing. A lower TC outer ring is sleeved around the lower inner TC. A spacer sleeve is arranged on one side of the lower inner TC inside the transmission shaft housing. A middle lock nut is arranged between the lower inner TC and the spacer sleeve.

[0015] By adopting the above technical solutions, it is convenient to connect the transmission shaft to the transmission shaft housing for use, improving the convenience and stability of use.

[0016] Specifically, a series bearing group is arranged on one side of the spacer sleeve on the inner side of the transmission shaft housing, an upper inner TC is arranged on one side of the series bearing group, and an upper outer TC is arranged on the periphery of the upper inner TC.

[0017] By adopting the above technical solution, it is easy to install the transmission shaft housing.

[0018] Beneficial effects of the utility model:

[0019] The utility model discloses an oilfield exploitation screw drill, which, by means of a ball seat, a ball angle shaft, a ball angle pressure cap and a steel ball, utilizes three bending points in the same direction to meet the larger bending point requirements of large displacement wells; while the bending angle is increased, the length of the drill motor assembly is not shortened, thereby ensuring that the torque of the drill is not reduced; an articulated type is adopted, and the bending angle is adjusted with steel balls at the bending point, thereby effectively ensuring the torsion resistance of the drill, thereby reducing the risk of the drill being twisted off. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0022] In the figure: 1, transmission shaft; 2, lower TC outer ring; 3, middle lock nut; 4, spacer; 5, transmission shaft housing; 6, series bearing group; 7, upper inner TC; 8, upper outer TC; 9, one-piece water cap; 10, ball pad; 11, connecting rod; 12, rubber sleeve; 13, lower lock nut; 14, lower universal joint housing; 15, ball angle shaft; 16, ball angle pressure cap; 17, stop screw; 18, steel ball; 19, sealing ring; 20, pin; 21, upper lock nut; 22, pressure ring; 23, steel ball; 24, upper universal joint housing; 25, second ball pad; 26, live hinge; 27, stator; 28, rotor; 29, ball seat; 30, sealing element; 31, second steel ball; 32, second ball angle pressure cap; 33, second pin; 34, second ball angle shaft; 35, reducer coupling; 36, lower inner TC. DETAILED DESCRIPTION

[0023] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0024] In order to meet the needs of large bending points in large displacement wells, the articulated structure design effectively enhances the circumferential torque at the articulation, thereby improving the use effect. Figure 1As shown, an oilfield exploitation screw drill described in the utility model comprises a transmission shaft 1, an upper universal joint housing 24, a sealing member 30 and a second ball angle shaft 34, one end of the transmission shaft 1 is sleeved with an upper universal joint housing 24, one end of the upper universal joint housing 24 is provided with a reducer coupling 35, the outer side of the reducer coupling 35 is provided with a second ball angle shaft 34, a ball seat 29 is provided on the inner side of one end of the upper universal joint housing 24 away from the transmission shaft 1, the outer periphery of the ball seat 29 is connected to a second ball angle pressure cap 32 by a thread, and the second ball angle pressure cap 32 is sleeved and connected to the second ball angle shaft 34, a second steel ball 31 is provided between the ball seat 29 and the second ball angle shaft 34, and a sealing member 30 is sleeved in a groove on the convex spherical surface of the second ball angle shaft 34;

[0025] A ball angle shaft 15 is arranged on the periphery of one end of the transmission shaft 1 and located inside the upper universal joint housing 24 . A ball angle pressure cap 16 is sleeved on the periphery of the ball angle shaft 15 at the other end of the upper universal joint housing 24 . A steel ball 18 is arranged between the ball angle pressure cap 16 and the ball angle shaft 15 .

[0026] When in use, it can not only meet the needs of large bending points in large displacement wells, but also the articulated structural design effectively enhances the circumferential torque at the articulation point. The total length of the drill bit is not shortened, ensuring the power required by the drill bit.

[0027] To improve, exemplary, Figure 1 As shown, the utility model also includes that the transmission shaft 1 includes a one-piece water cap 9, a lower universal joint housing 14 is arranged on the periphery of the one-piece water cap 9, a connecting rod 11 is rotatably connected to the inner side of the transmission shaft 1, one end of the one-piece water cap 9 is located on the inner side of the lower universal joint housing 14 and a lower locking nut 13 is arranged, the lower universal joint housing 14 and a ball pad 10 are arranged at the bottom of the connecting rod 11 in the transmission shaft 1, and a rubber sleeve 12 is arranged between the lower locking nut 13 and the one-piece water cap 9.

[0028] When in use, the lower universal joint housing 14 can be hingedly connected to the rotating shaft 1 through the connecting rod 11, the lower locking nut 13, the ball pad 10 and the rubber sleeve 12, thereby improving the flexibility of use.

[0029] For example, Figure 1 As shown, the utility model also includes that a retaining screw 17 corresponding to the steel ball 18 is provided on the outer side of the ball angle pressure cap 16 through a reserved hole, a sealing ring 19 is sleeved in the groove on the convex spherical surface of the ball angle shaft 15, a pin 20 is provided on the outer side of the transmission shaft 1, and the pin 20 passes through the upper universal joint housing 24, the outer side of the upper universal joint housing 24 is connected to the second pin 33 through a slot, and the second pin 33 passes through the ball seat 29.

[0030] In use, through the anti-backward screw 17, pin 20 and second pin 33 provided, it can not only play a positioning role, but also enhance the axial torsion of the hinge.

[0031] Exemplarily, as Figure 1 shown, the present utility model further includes that a stator 27 is arranged on the periphery of the upper universal joint housing 24, a corresponding rotor 28 is arranged on the inner side of the stator 27, a live hinge 26 is arranged on one side of the rotor 28, a steel ball 23 is arranged at the bottom of the live hinge 26, a second ball pad 25 is arranged on the periphery of the steel ball 23, a lock nut 21 is arranged on one side of the live hinge 26, and a retainer ring 22 is arranged between the lock nut 21 and the live hinge 26.

[0032] In use, through the lock nut 21, live hinge 26 and steel ball 23, it is convenient to carry out hinge connection treatment at the connection of the upper universal joint housing 24, thereby improving the flexibility of use, and there is a ball-type universal shaft in the hinge inner hole at this place. The function of the ball-type universal shaft is to transmit the torque and speed generated by the motor to the transmission shaft and drill bit of the bearing assembly, and it converts the planetary motion of the rotor into the fixed-axis rotation of the transmission shaft.

[0033] Exemplarily, as Figure 1 shown, the present utility model further includes that a transmission shaft housing 5 is sleeved on the periphery of the transmission shaft 1, a lower inner TC36 is arranged on the outer surface of the transmission shaft 1 inside the transmission shaft housing 5, a lower TC outer ring 2 is sleeved on the periphery of the lower inner TC36, a spacer sleeve 4 is arranged on one side of the lower inner TC36 inside the transmission shaft housing 5, and a middle lock nut 3 is arranged between the lower inner TC36 and the spacer sleeve 4.

[0034] In use, through the lower inner TC36, TC outer ring 2, spacer sleeve 4 and middle lock nut 3, it is convenient to connect the transmission shaft 1 to the transmission shaft housing 5 for use, improving the convenience and stability of use.

[0035] Exemplarily, as Figure 1 shown, the present utility model further includes that a series bearing group 6 is arranged on one side of the spacer sleeve 4 inside the transmission shaft housing 5, an upper inner TC7 is arranged on one side of the series bearing group 6, and an upper outer TC8 is arranged on the periphery of the upper inner TC7.

[0036] In use, through the series bearing group 6, upper inner TC7 and upper outer TC8, it is convenient to install the transmission shaft housing 5.

[0037] When in use, the utility model can form an articulated coaxial three-bend screw drill by means of the provided ball seat 29, ball angle shaft 15, second ball angle shaft 34, ball angle gland 16, second ball angle gland 32, steel balls 18, second steel balls 31 and seal 30, realizing three coaxial bend points and meeting the requirements of large displacement wells with larger bend points. Moreover, while the bend angle increases, the total length of the drill motor is not shortened, thus ensuring that the torque of the drill does not decrease. By adopting the articulated type and using 18 steel balls and 31 second steel balls to adjust the bend angle at the bend point, the anti-torsion ability of itself is effectively guaranteed, thereby reducing the risk of the drill being twisted off. This coaxial three-bend drill can not only meet the requirements of large displacement wells with larger bend points, but also the articulated structure design effectively enhances the circumferential torsion force at the articulated part, and the total length of the drill is not shortened, ensuring the power required by the drill.

[0038] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model will have various changes and improvements, and all these changes and improvements fall within the scope of protection required by the utility model. The scope of protection required by the utility model is defined by the appended claims and their equivalents.

Claims

1. An oilfield exploitation screw drill, characterized in that: The invention comprises a transmission shaft (1), an upper universal joint housing (24), a sealing member (30) and a second ball angle shaft (34); one end of the transmission shaft (1) is sleeved with the upper universal joint housing (24); one end of the upper universal joint housing (24) is provided with a reducer coupling (35); the outer side of the reducer coupling (35) is provided with a second ball angle shaft (34); the inner side of the end of the upper universal joint housing (24) away from the transmission shaft (1) is provided with a ball seat (29); the outer periphery of the ball seat (29) is connected to a second ball angle pressure cap (32) by a thread; the second ball angle pressure cap (32) is sleeved and connected to the second ball angle shaft (34); a second steel ball (31) is provided between the ball seat (29) and the second ball angle shaft (34); and a sealing member (30) is sleeved in a groove on the convex spherical surface of the second ball angle shaft (34); A ball angle shaft (15) is arranged on the periphery of one end of the transmission shaft (1) and located inside the upper universal joint housing (24); a ball angle pressure cap (16) is sleeved on the periphery of the ball angle shaft (15) at the other end of the upper universal joint housing (24); and a steel ball (18) is arranged between the ball angle pressure cap (16) and the ball angle shaft (15).

2. The oilfield exploitation screw drill according to claim 1, characterized in that: The transmission shaft (1) comprises a one-piece water cap (9), a lower universal joint housing (14) is arranged on the periphery of the one-piece water cap (9), a connecting rod (11) is rotatably connected to the inner side of the transmission shaft (1), one end of the one-piece water cap (9) is located on the inner side of the lower universal joint housing (14) and a lower locking nut (13) is arranged, the lower universal joint housing (14) and the transmission shaft (1) are provided with a ball pad (10) at the bottom of the connecting rod (11), and a rubber sleeve (12) is arranged between the lower locking nut (13) and the one-piece water cap (9).

3. The oilfield exploitation screw drill according to claim 1, characterized in that: The outer side of the ball angle pressure cap (16) is provided with a stop screw (17) corresponding to the steel ball (18) through a reserved hole, a sealing ring (19) is sleeved in the groove on the convex spherical surface of the ball angle shaft (15), a pin (20) is provided on the outer side of the transmission shaft (1), and the pin (20) passes through the upper universal joint housing (24), the outer side of the upper universal joint housing (24) is connected to a second pin (33) through a slot, and the second pin (33) passes through the ball seat (29).

4. The oilfield exploitation screw drill according to claim 1, characterized in that: A stator (27) is disposed on the periphery of the upper universal joint housing (24), a corresponding rotor (28) is disposed on the inner side of the stator (27), a live hinge (26) is disposed on one side of the rotor (28), a steel ball (23) is disposed on the bottom of the live hinge (26), a second ball pad (25) is disposed on the periphery of the steel ball (23), a locking nut (21) is disposed on one side of the live hinge (26), and a pressure ring (22) is disposed between the locking nut (21) and the live hinge (26).

5. The oilfield exploitation screw drill according to claim 1, characterized in that: The outer sleeve of the transmission shaft (1) is provided with a transmission shaft housing (5); the outer surface of the transmission shaft (1) is provided with a lower inner TC (36) on the inner side of the transmission shaft housing (5); the outer sleeve of the lower inner TC (36) is provided with a lower TC outer ring (2); the inner side of the transmission shaft housing (5) is provided with a spacer sleeve (4) on one side of the lower inner TC (36); and a middle lock nut (3) is provided between the lower inner TC (36) and the spacer sleeve (4).

6. The oilfield exploitation screw drill according to claim 5, characterized in that: A series bearing group (6) is arranged on the inner side of the transmission shaft housing (5) and located on one side of the spacer sleeve (4); an upper inner TC (7) is arranged on one side of the series bearing group (6); and an upper outer TC (8) is arranged on the periphery of the upper inner TC (7).

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