Six-mode screw drill universal shaft

Abstract

The utility model 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. 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 has the advantages that the anti-shearing face is greatly enlarged, the torque transmission capacity is remarkably improved, and the universal shaft can better adapt to the large-torque operation environment through a face-face contact mode.

Description

Technical Field

[0001] This utility model belongs to the field of roller cone drill bit technology, specifically relating to a six-way screw drill universal joint. Background Technology

[0002] In oil and gas drilling, screw drill strings play a crucial role, providing drilling power to the drill bit and adjusting the wellbore trajectory. They are widely used in oil and gas development drilling operations. As oil and gas resource extraction moves towards deeper wells, oilfield clients increasingly demand faster and more efficient drilling, placing higher demands on the service life of screw drill strings. However, during drilling, high drilling pressure and high displacement conditions often lead to premature failure of the screw drill string's universal joint.

[0003] Early screw universal joints were mostly petal-shaped, operating under mud lubrication conditions. The universal joint's movable shaft transmitted torque and speed through point-to-line contact. Under the erosive action of mud, the universal joint wore out severely, increasing clearance and shortening its service life, thus reducing the overall lifespan of the screw shaft. Later, ball-and-pin sealed universal joints appeared. Although these used 12 balls to connect the movable shaft and connecting rod, with line contact between the balls and the shaft and connecting rod, in actual downhole operations, when the screw was subjected to unstable torque, the balls were often sheared, causing the universal joint to fail. This failed to meet the reliability and service life requirements of actual drilling operations. Utility Model Content

[0004] The purpose of this invention is to provide a six-way universal joint for screw drills to solve the problems existing in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a hexagonal universal joint for a screw drill bit, comprising an upper auger, 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 auger; the ball seat is embedded in the upper auger; 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 auger through a hexagonal connection; the transmission key is disposed between the hexagonal connecting rod and the upper auger; the upper locking sleeve is connected to the upper auger 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 operates under sealed grease conditions; the connection structure at the lower end is the same as that at the upper end.

[0006] Preferably, the hexagonal connection between the hexagonal link and the upper hinge is a face-to-face contact to increase the shear resistance surface and improve the torque transmission capability.

[0007] Preferably, the rubber sealing sleeve forms a sealing structure to prevent impurities such as mud from entering the transmission parts and extend the service life of the universal joint.

[0008] Preferably, the ball seat is tightly fitted with the upper hinge to ensure accurate ball seat positioning and secure installation.

[0009] Preferably, the ball cap fits tightly with the top of the hexagonal connecting rod, and the ball cap makes 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 hinge.

[0011] Preferably, the upper locking sleeve is connected to the upper hinged sleeve by a thread, which serves to fasten the internal structure.

[0012] Preferably, the connection structure and connection method of the lower retractable sleeve, lower hinge and hexagonal connecting rod at the lower end are the same as the connection structure and connection method of the upper hinge, upper locking sleeve and other components at the upper end and hexagonal connecting rod.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model adopts a hexagonal connection structure. Compared with the point-to-line contact of the traditional petal-type universal joint and the line-to-line contact of the ball-and-column type sealed universal joint, this universal joint greatly increases the shear resistance surface through surface-to-surface contact, significantly improves the torque transmission capability, and can better adapt to high torque working environments.

[0014] The hexagonal connection significantly increases the contact area of ​​the universal joint, resulting in a marked reduction in wear under the same operating conditions and effectively extending its service life. Simultaneously, the sealing structure prevents the intrusion of mud and other impurities, further improving the reliability and lifespan of the universal joint. This better meets the requirements of high-torque screw drilling, reduces drilling operation interruptions due to universal joint failure, and improves drilling efficiency.

[0015] The hexagonal connection method makes the transmission of torque and speed more stable, reduces transmission fluctuations caused by poor contact, and helps to improve the stability of drilling operations and the rock-breaking effect of the drill bit. Attached Figure Description

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

[0017] Figure 2 This is a front view of the hexagonal connecting rod in this utility model;

[0018] Figure 3 This is a perspective view of the hexagonal connecting rod in this utility model;

[0019] Figure 4 This is a perspective view of the transmission key in this utility model;

[0020] Figure 5This is a diagram showing the positions of the hexagonal connecting rod and the transmission key in this utility model. Detailed Implementation

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0022] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing this invention 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, and therefore should not be construed as a limitation on this invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0023] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixed connection," and "fixed connection" 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 of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] The present invention will be further described below with reference to specific embodiments and accompanying drawings.

[0025] like Figure 1-5 As shown, a hexagonal universal joint for a screw drill includes an upper auger 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 retractable sleeve 8, and a lower auger 9. The ball seat is embedded in the upper auger; 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 auger through a hexagonal connection; the transmission key is located between the hexagonal connecting rod and the upper auger; the upper locking sleeve is connected to the upper auger 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 sealed grease conditions; the connection structure at the lower end is the same as that at the upper end.

[0026] In the actual assembly process, the ball seat is first precisely embedded in the upper hinge to ensure a secure and accurate installation. Next, the ball cap is inserted into the top of the hexagonal connecting rod, ensuring good contact between the cap and the ball seat's spherical surface for smooth torque transmission. Then, the transmission key is installed between the hexagonal connecting rod and the upper hinge to further enhance the connection stability and torque transmission efficiency. Afterward, the upper locking sleeve is installed on the upper hinge via a threaded connection to secure the internal structure. Finally, a rubber sealing sleeve is installed between the hexagonal connecting rod and the upper locking sleeve, and sealing grease is injected to ensure the transmission operates in a sealed environment. The lower connection is installed following the same steps as the upper connection.

[0027] During operation, when the screw drill motor generates planetary motion, torque and speed are transmitted to the hexagonal connecting rod through the ball seat and ball cap. Because the hexagonal connecting rod is hexagonally connected to the upper auger, it stably converts planetary motion into fixed-axis motion and reliably transmits torque and speed to the drive shaft, driving the drill bit to break rock. Throughout the operation, the sealing structure effectively prevents impurities such as mud from entering the transmission parts, reducing wear and ensuring the normal operation of the universal joint.

[0028] It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

Claims

1. A six-mode screw downhole motor universal shaft, characterized in that, It comprises upper live winding, ball seat, ball cap, transmission key, upper locking sleeve, rubber sealing sleeve, hexagonal connecting rod, lower retraction sleeve and lower live winding; the ball seat is embedded in the upper live winding; the ball cap is inserted into the top end of the hexagonal connecting rod, and the ball cap and the ball seat are in spherical surface contact; the top of the hexagonal connecting rod is connected with the upper live winding through hexagonal connection; the transmission key is arranged between the hexagonal connecting rod and the upper live winding; the upper locking sleeve is connected with the upper live winding 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 sealed grease condition; the connecting structure at the lower end is the same as that at the upper end.

2. The six-mode screwdown universal shaft according to claim 1, characterized in that, The hexagonal connecting mode of the hexagonal connecting rod and the upper live winding is face-to-face contact.

3. The six-mode screwdown universal shaft according to claim 1, characterized in that, The rubber sealing sleeve forms a sealing structure.

4. The six-mode screw- downhole motor universal shaft of claim 1, wherein, The ball seat is closely embedded with the upper live winding.

5. The six-mode screwdown universal shaft as claimed in claim 1, wherein, The ball cap is closely matched with the top end of the hexagonal connecting rod.

6. The six-mode screw- downhole motor universal shaft of claim 1, wherein, The upper locking sleeve is connected with the upper live winding through threads.

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