Shaft body anti-falling mechanism for transmission shaft of screw drill

Abstract

The utility model belongs to the technical field of petroleum drilling equipment, and particularly relates to a screw drill transmission shaft body anti-falling mechanism which comprises a transmission shaft, a lower TC bearing movable sleeve, a lower TC bearing static sleeve, an anti-falling ball, a spacer bush, a semi-ring pressure-bearing sleeve, a thrust bearing set, a transmission shaft shell, an upper TC bearing static sleeve and an upper TC bearing movable sleeve. The lower TC bearing movable sleeve is connected with the transmission shaft through threads, and the transmission shaft shell is connected with the lower TC bearing static sleeve through threads; the upper end of the lower TC bearing movable sleeve is provided with six positioning grooves for the anti-falling balls, the anti-falling balls are arranged between the lower TC bearing movable sleeve and the spacer bush and matched with the positioning grooves, the semi-ring is connected with the upper end of the lower TC bearing movable sleeve, and the pressure-bearing sleeve is pressed on one side of the semi-ring and arranged on the transmission shaft in a sleeving mode. According to the device, the lower TC bearing movable sleeve is connected with the lower TC bearing through the six anti-falling balls, and the lower TC bearing is connected with the lower part of the transmission shaft through the threads, so that the failure part does not fall off, and the underground safety is ensured.

Description

Technical Field

[0001] This utility model belongs to the technical field of oil drilling equipment, specifically relating to a screw drill drive shaft anti-drop mechanism. Background Technology

[0002] In oil and gas drilling, screw drills are mainly used for drilling special process wells, and can also be used for drilling vertical wells. With the development of oil and gas exploration and development methods, drilling technology is constantly evolving, driving the continuous improvement and advancement of screw drills. Looking at its development process and trends, its direction can be summarized as: long lifespan, high torque, high speed, and multi-functionality. Currently, in oil and gas drilling projects, the purpose of the drive shaft assembly of screw drills is to transmit the motor's power to the drill bit; the lifespan of the drive shaft assembly determines the overall lifespan of the screw drill. The motor transmits power to the drive shaft through a universal joint. During drilling, the drive shaft assembly not only bears the drilling pressure but also transmits torque and speed. The drive shaft assembly has many parts, and after prolonged downhole operation, drive shaft assembly failure can occur, leading to downhole accidents. Drive shaft breakage at the lower bearing often results in the shaft falling into the well due to lower anti-fall failure. Utility Model Content

[0003] The purpose of this utility model is to provide a mechanism to prevent the screw drill drive shaft from falling off, so as to solve the problems existing in the prior art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a screw drill drive shaft assembly anti-drop mechanism, comprising a drive shaft, a lower TC bearing moving sleeve, a lower TC bearing stationary sleeve, anti-drop balls, a spacer, a semi-ring bearing sleeve, a thrust bearing assembly, a drive shaft housing, an upper TC bearing stationary sleeve, and an upper TC bearing moving sleeve; the lower TC bearing moving sleeve and the drive shaft are connected together by threads, the drive shaft housing and the lower TC bearing stationary sleeve are connected by threads, the thrust bearing assembly is installed between the drive shaft housing and the drive shaft, the upper TC bearing stationary sleeve is installed between the drive shaft housing and the thrust bearing assembly, and the upper TC bearing moving sleeve is threaded onto the drive shaft; the upper end of the lower TC bearing moving sleeve has six anti-drop ball positioning grooves, the anti-drop balls are placed between the lower TC bearing moving sleeve and the spacer and cooperate with the positioning grooves, the semi-ring is connected to the upper end of the lower TC bearing moving sleeve, and the bearing sleeve presses against one side of the semi-ring and is sleeved on the drive shaft.

[0005] Preferably, the cross-section of the positioning groove is hemispherical.

[0006] The beneficial effects of this utility model are: in this device, the lower TC bearing moving sleeve is connected to the lower TC bearing by 6 anti-drop balls, and the lower TC bearing is connected to the lower part of the drive shaft by threads, so that the failed part will not fall off and the safety of the well is guaranteed. Attached Figure Description

[0007] Figure 1 This is the front view of this utility model;

[0008] Figure 2 This is a cross-sectional view of the moving sleeve of the lower TC bearing in this utility model;

[0009] Figure 3 This is an enlarged view of the anti-falling part in this utility model;

[0010] In the diagram: 1. Drive shaft, 2. Lower TC bearing moving sleeve, 3. Lower TC bearing stationary sleeve, 4. Anti-ball drop, 5. Half ring, 6. Pressure sleeve, 7. Spacer, 8. Drive shaft housing, 9. Thrust bearing assembly, 10. Upper TC bearing stationary sleeve, 11. Upper TC bearing moving sleeve. Detailed Implementation

[0011] It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0012] In the description of this utility model, 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 orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model 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 utility model. 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 utility model, unless otherwise stated, "a plurality of" means two or more.

[0013] In the description of this utility model, 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 can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0014] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings and preferred embodiments.

[0015] like Figure 1 As shown, a screw drill drive shaft assembly anti-drop mechanism includes a drive shaft 1, a lower TC bearing moving sleeve 2, a lower TC bearing stationary sleeve 3, an anti-drop ball 4, a half ring 5, a pressure-bearing sleeve 6, a spacer 7, a drive shaft housing 8, a thrust bearing assembly 9, an upper TC bearing stationary sleeve 10, and an upper TC bearing moving sleeve 11.

[0016] The lower TC bearing moving sleeve 2 and the drive shaft 1 are connected together by threads. The drive shaft housing 8 and the lower TC bearing stationary sleeve 3 are connected by threads. The thrust bearing assembly 9 is installed between the drive shaft housing 8 and the drive shaft 1. The upper TC bearing stationary sleeve 10 is installed between the drive shaft housing 8 and the thrust bearing assembly 9. The upper TC bearing moving sleeve 11 is threaded onto the drive shaft 1.

[0017] As an improvement to this utility model, the upper end of the lower TC bearing moving sleeve 2 has six anti-drop ball positioning grooves 12, the cross-section of which is hemispherical. The anti-drop balls 4 are placed between the lower TC bearing moving sleeve 2 and the spacer 7 and cooperate with the positioning grooves. The semi-ring 5 is connected to the upper end of the lower TC bearing moving sleeve, and the pressure sleeve 6 presses on one side of the semi-ring and is sleeved on the drive shaft. The lower TC bearing moving sleeve connects the lower TC bearing through the six anti-drop balls, and the lower TC bearing connects the lower part of the drive shaft through threads, thereby preventing the failed part from falling off and ensuring downhole safety.

[0018] 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 mechanism to prevent the screw drill drive shaft from falling off, characterized in that: The assembly includes a drive shaft, a lower TC bearing moving sleeve, a lower TC bearing stationary sleeve, anti-ball bearings, a spacer, a semi-ring bearing sleeve, a thrust bearing assembly, a drive shaft housing, an upper TC bearing stationary sleeve, and an upper TC bearing moving sleeve. The lower TC bearing moving sleeve and the drive shaft are connected together by threads. The drive shaft housing and the lower TC bearing stationary sleeve are also connected by threads. The thrust bearing assembly is installed between the drive shaft housing and the drive shaft. The upper TC bearing stationary sleeve is installed between the drive shaft housing and the thrust bearing assembly. The upper TC bearing moving sleeve is threaded onto the drive shaft. The upper end of the lower TC bearing moving sleeve has six anti-ball bearing positioning grooves. The anti-ball bearings are placed between the lower TC bearing moving sleeve and the spacer and engage with the positioning grooves. The semi-ring is connected to the upper end of the lower TC bearing moving sleeve. The bearing sleeve presses against one side of the semi-ring and is fitted onto the drive shaft.

2. The anti-drop mechanism for the screw drill drive shaft body according to claim 1, characterized in that: The cross-section of the positioning groove is hemispherical.

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