Six-mode screw drill universal shaft

Abstract

The invention belongs to the technical field of roller bits, and particularly relates to a six-mode screw drill universal shaft which comprises an upper movable hinge, a ball seat, a ball cap, a transmission key, an upper locking sleeve, a rubber sealing sleeve, a hexagonal connecting rod, a lower indentation sleeve and a lower movable hinge. The ball seat is embedded in the upper movable hinge; the ball cap is inserted into the top end of the hexagonal connecting rod and makes contact with the ball seat through a spherical surface. The top of the hexagonal connecting rod is connected with the upper movable hinge through a hexagon; the transmission key is arranged between the hexagonal connecting rod and the upper movable hinge; the upper locking sleeve is connected with the upper movable hinge through threads; the rubber sealing sleeve is connected with the hexagonal connecting rod and the upper locking sleeve and is used for ensuring that the transmission part works under the condition of sealing grease; the connecting structure of the lower end is identical to that of the upper end. According to the universal shaft, a hexagonal connecting structure is adopted, compared with point-line contact of a traditional petal type universal shaft and line-line contact of a traditional ball-column type sealing universal shaft, the universal shaft greatly enlarges the anti-shearing face through a face-face contact mode, the torque transmission capacity is remarkably improved, and the universal shaft can better adapt to the large-torque operation environment.

Description

Technical Field

[0001] The invention belongs to the technical field of roller drill bits, and in particular relates to a six-way screw drill universal shaft. Background Art

[0002] In oil and gas drilling projects, screw drills play a vital role. They provide drilling power for the drill bit and are used to adjust the wellbore trajectory. They are widely used in oil and gas development drilling operations. As oil and gas resource exploitation develops towards deep wells, the oil field party's demand for speed and efficiency is increasing, and higher requirements are also placed on the service life of screw drills. However, during the drilling process, high drilling pressure and large displacement operating conditions often lead to premature failure of the universal shaft of the screw drill.

[0003] Early screw universal shafts were mostly petal-type universal shafts, which worked under mud lubrication conditions, and the universal shaft live joints transmitted torque and speed through point-line contact. Under the erosion of mud, the universal shaft was severely worn and the gap increased, which shortened the service life of the universal shaft and thus shortened the service life of the entire screw. The subsequent ball-column sealed universal shaft, although it used 12 ball columns to connect the live joint and the connecting rod together, and the ball column and the live joint and the connecting rod were in line-to-line contact, but in actual downhole operations, when the screw was subjected to unstable torque, the ball column was often sheared, causing the universal shaft to fail, and could not meet the requirements of actual drilling operations for the reliability and service life of the universal shaft. Summary of the invention

[0004] The object of the present invention is to provide a six-way screw drill universal shaft to solve the problems existing in the background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a six-way screw drill universal shaft, comprising an upper live hook, a ball seat, a ball cap, a transmission key, an upper locking sleeve, a rubber sealing sleeve, a hexagonal connecting rod, a lower retracting sleeve and a lower live hook; the ball seat is embedded in the upper live hook; the ball cap is inserted into the top of the hexagonal connecting rod, and the ball cap contacts the ball seat through a spherical surface; the top of the hexagonal connecting rod is connected to the upper live hook through a hexagon; the transmission key is arranged between the hexagonal connecting rod and the upper live hook; the upper locking sleeve is connected to the upper live hook through a thread; the rubber sealing sleeve is connected to the hexagonal connecting rod and the upper locking sleeve to ensure that the transmission part works under sealing grease conditions; the connection structure of the lower end is the same as that of the upper end.

[0006] Preferably, the hexagonal connection between the hexagonal connecting rod and the upper live hitch is in surface-to-surface contact, so as to increase the anti-shear surface and improve the ability to transmit torque.

[0007] Preferably, the rubber sealing sleeve forms a sealing structure to prevent mud and other impurities from invading the transmission part, thereby extending the service life of the universal shaft.

[0008] Preferably, the ball seat is tightly embedded with the upper live hook to ensure that the ball seat is accurately positioned and securely installed.

[0009] Preferably, the ball cap is tightly matched with the top end of the hexagonal connecting rod, and the ball cap is in good contact with the spherical surface of the ball seat to ensure smooth torque transmission.

[0010] Preferably, the transmission key enhances the connection stability and torque transmission efficiency between the hexagonal connecting rod and the upper live hitch.

[0011] Preferably, the upper locking sleeve is connected to the upper live hook via a thread, thereby fastening the internal structure.

[0012] Preferably, the connection structure and connection method between the lower retracting sleeve, the lower live hitch and the hexagonal connecting rod at the lower end are the same as the connection structure and connection method between the upper live hitch, the upper locking sleeve and other components at the upper end and the hexagonal connecting rod.

[0013] Compared with the prior art, the present invention has the following beneficial effects: the present invention adopts a hexagonal connection structure, and compared with the point-line contact of the traditional petal-type universal joint and the line-line contact of the ball-column sealed universal joint, the present universal joint greatly increases the shear resistance surface through surface-to-surface contact, significantly improves the ability to transmit torque, and can better adapt to the high-torque working environment.

[0014] The hexagonal connection method greatly increases the contact area of ​​the universal shaft, and under the same operating conditions, the degree of wear is significantly reduced, effectively extending the service life of the universal shaft. At the same time, with the sealing structure, the intrusion of impurities such as mud is avoided, further improving the reliability and service life of the universal shaft, and being able to better meet the use requirements of high-torque screws, reducing drilling interruptions caused by universal shaft failure, and improving drilling efficiency.

[0015] The hexagonal connection makes the transmission of torque and speed smoother, reduces transmission fluctuations caused by poor contact, and helps improve the stability of drilling operations and the rock breaking effect of the drill bit. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a cross-sectional view of the present invention;

[0017] Figure 2 It is a front view of the hexagonal connecting rod in the present invention;

[0018] Figure 3 is a three-dimensional diagram of a hexagonal connecting rod in the present invention;

[0019] Figure 4 is a three-dimensional diagram of the transmission key in the present invention;

[0020] Figure 5 It is a position diagram of the hexagonal connecting rod and the transmission key in the present invention. DETAILED DESCRIPTION

[0021] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0023] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fixed connection" and "fixed connection" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0024] The present invention will be further described below in conjunction with specific embodiments and drawings.

[0025] like Figure 1-5 As shown, a six-way screw drill universal shaft includes an upper live hook 1, a ball seat 2, a ball cap 3, a transmission key 4, an upper locking sleeve 5, a rubber sealing sleeve 6, a hexagonal connecting rod 7, a lower retracting sleeve 8 and a lower live hook 9; the ball seat is embedded in the upper live hook; the ball cap is inserted into the top of the hexagonal connecting rod, and the ball cap and the ball seat are in contact through a spherical surface; the top of the hexagonal connecting rod is connected to the upper live hook through a hexagon; the transmission key is arranged between the hexagonal connecting rod and the upper live hook; the upper locking sleeve is connected to the upper live hook through a thread; the rubber sealing sleeve is connected to the hexagonal connecting rod and the upper locking sleeve, so as to ensure that the transmission part works under sealing grease conditions; the connection structure of the lower end is the same as that of the upper end.

[0026] In the actual assembly process, first accurately embed the ball seat in the upper live hitch to ensure that the ball seat is firmly installed and accurately positioned. Next, insert the ball cap into the top of the hexagonal connecting rod so that the ball cap and the spherical surface of the ball seat are in good contact to ensure smooth torque transmission. Then, install the transmission key between the hexagonal connecting rod and the upper live hitch to further enhance the connection stability and torque transmission efficiency between the two. After that, install the upper locking sleeve on the upper live hitch by threaded connection to tighten the internal structure. Then install the rubber sealing sleeve between the hexagonal connecting rod and the upper locking sleeve, and inject sealing grease to enable the transmission part to work in a sealed environment. The lower end connection is installed according to the same steps as the upper end.

[0027] During use, when the screw drill motor generates planetary motion, the torque and speed are transmitted to the hexagonal connecting rod through the ball seat and ball cap. Since the hexagonal connecting rod and the upper live hook are connected by hexagonal connection, the planetary motion can be stably converted into fixed axis motion, and the torque and speed can be reliably transmitted to the transmission shaft to drive the drill bit to break the rock. During the entire operation process, the sealing structure effectively prevents mud and other impurities from entering the transmission part, reduces wear, and ensures the normal operation of the universal shaft.

[0028] It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A six-way screw drill universal shaft, characterized in that: It includes an upper live hitch, a ball seat, a ball cap, a transmission key, an upper locking sleeve, a rubber sealing sleeve, a hexagonal connecting rod, a lower retracting sleeve and a lower live hitch; the ball seat is embedded in the upper live hitch; the ball cap is inserted into the top end of the hexagonal connecting rod, and the ball cap contacts the ball seat through the spherical surface; the top of the hexagonal connecting rod is connected to the upper live hitch through a hexagon; the transmission key is arranged between the hexagonal connecting rod and the upper live hitch; the upper locking sleeve is connected to the upper live hitch through a thread; the rubber sealing sleeve is connected to the hexagonal connecting rod and the upper locking sleeve to ensure that the transmission part works under the condition of sealing grease; the connection structure of the lower end is the same as that of the upper end.

2. The six-way screw drill universal shaft according to claim 1, characterized in that: The hexagonal connection mode between the hexagonal connecting rod and the upper live hitch is surface-to-surface contact.

3. The six-way screw drill universal shaft according to claim 1, characterized in that: The rubber sealing sleeve forms a sealing structure.

4. The six-way screw drill universal shaft according to claim 1, characterized in that: The ball seat is tightly embedded with the upper live hook.

5. The six-way screw drill universal shaft according to claim 1, characterized in that: The ball cap is tightly matched with the top end of the hexagonal connecting rod.

6. The six-way screw drill universal shaft according to claim 1, characterized in that: The upper locking sleeve is connected with the upper movable hook through a thread.

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