Anti-falling mechanism for transmission shaft shell 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 shell falling prevention mechanism which comprises a transmission shaft, a lower TC bearing movable sleeve, a lower TC bearing static sleeve, a thrust bearing set, a transmission shaft upper shell, a transmission shaft lower falling prevention shell, an upper TC bearing static sleeve and an upper TC bearing movable sleeve. The transmission shaft upper shell and the transmission shaft lower anti-falling shell are connected together, the lower TC bearing movable sleeve and the transmission shaft are connected together through threads, the transmission shaft shell and the lower TC bearing static sleeve are connected through threads, and the thrust bearing set is installed between the transmission shaft upper shell and the transmission shaft. The upper TC bearing static sleeve is installed between the transmission shaft shell and the thrust bearing set, and the upper TC bearing movable sleeve is connected to the transmission shaft in a threaded mode. According to the device, the transmission shaft upper shell and the transmission shaft lower anti-falling shell are connected and then are matched with the transmission shaft head, so that the failure part does not fall off without additional components, and the underground safety is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of petroleum drilling equipment, and particularly relates to a screw drill transmission shaft housing anti-drop mechanism. Background Art

[0002] In oil and gas drilling, screw drill tools are primarily used for drilling specialized wells, but can also be used to drill vertical wells. With the evolution of oil and gas exploration and development, drilling technology continues to advance, driving the continuous improvement and advancement of screw drill tools. Their development and trends can be broadly summarized as: long life, high torque, high speed, and multifunctionality. Currently, the drive shaft assembly of screw drill tools used in oil and gas drilling projects transmits motor power to the drill bit, and the life of the drive shaft assembly determines the life of the entire screw drill tool. The motor transmits power to the drive shaft via a universal joint. During drilling, the drive shaft assembly not only withstands the pressure on bit (WOB) but also transmits torque and speed. Due to the complex number of parts in the drive shaft assembly, prolonged downhole operation can lead to failure, resulting in downhole accidents. Drive shafts often break at the lower bearing, often resulting in failure due to a lack of safety measures. Utility Model Content

[0003] The purpose of the utility model is to provide a screw drill transmission shaft housing anti-drop mechanism to solve the problems existing in the prior art.

[0004] To achieve the above objectives, the present invention provides the following technical solutions: a screw drill drive shaft housing anti-drop mechanism, comprising a drive shaft, a lower TC bearing movable sleeve, a lower TC bearing static sleeve, a thrust bearing group, a drive shaft upper housing, a drive shaft lower anti-drop housing, an upper TC bearing static sleeve, and an upper TC bearing movable sleeve; the drive shaft upper housing and the drive shaft lower anti-drop housing are connected together, the lower TC bearing movable sleeve and the drive shaft are threaded together, the drive shaft housing and the lower TC bearing static sleeve are threaded together, the thrust bearing group is mounted between the drive shaft upper housing and the drive shaft, the upper TC bearing static sleeve is mounted between the drive shaft housing and the thrust bearing group, and the upper TC bearing movable sleeve is threadedly connected to the drive shaft.

[0005] Preferably, there is an annular shoulder on the upper part of the shaft head end of the transmission shaft, and the lower anti-drop shell of the transmission shaft is connected to the upper shell of the transmission shaft by the shaft head end of the transmission shaft shaft body, and the inner annular shoulder of the lower part of the anti-drop shell of the transmission shaft cooperates with the outer annular shoulder of the shaft head of the transmission shaft.

[0006] The beneficial effect of the utility model is that the upper shell of the transmission shaft and the lower anti-fall shell of the transmission shaft in the device are connected, and then cooperate with the shaft head of the transmission shaft. Without additional components, the failed part is prevented from falling, thereby ensuring underground safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is the main view of the utility model;

[0008] Figure 2 This is a cross-sectional view of the anti-drop housing under the transmission shaft in the utility model;

[0009] Figure 3 This is a cross-sectional view of the transmission shaft in the utility model;

[0010] In the figure: 1. Drive shaft, 2. Lower TC bearing movable sleeve, 3. Lower TC bearing static sleeve, 4. Drive shaft lower anti-drop housing, 5. Drive shaft upper housing, 6. Half ring, 7. Pressure sleeve, 8. Spacer, 9. Thrust bearing assembly, 10. Upper TC bearing static sleeve, 11. Upper TC bearing movable sleeve. DETAILED DESCRIPTION

[0011] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0012] 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 orientations or positional relationships 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 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" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second" and the like 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.

[0013] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," "fixedly connected," and "fixed connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art can understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0014] The specific implementation of the present invention is described in detail below with reference to the accompanying drawings and preferred embodiments.

[0015] like Figure 1 As shown, a screw drill drive shaft housing anti-drop mechanism includes a drive shaft 1, a lower TC bearing movable sleeve 2, a lower TC bearing static sleeve 3, a drive shaft lower anti-drop housing 4, a drive shaft upper housing 5, a half ring 6, a pressure sleeve 7, a spacer sleeve 8, a thrust bearing group 9, an upper TC bearing static sleeve 10 and an upper TC bearing movable sleeve 11; the drive shaft upper housing 5 and the drive shaft lower anti-drop housing 4 are connected together, and the two are connected together by threads, thereby preventing the drive shaft housing from falling.

[0016] The transmission shaft 1 cooperates with the transmission shaft lower anti-drop housing 4. Specifically, the transmission shaft lower anti-drop housing 4 is provided with an inner annular shoulder 12 inwardly. Figure 2 and the drive shaft head is provided with an outer annular shoulder 13 circumferentially outwardly, as shown Figure 3 As shown, the two cooperate with each other, so that the anti-drop housing 4 under the transmission shaft cannot fall from the transmission shaft.

[0017] The lower TC bearing movable sleeve and the transmission shaft are connected together by threads, the transmission shaft housing and the lower TC bearing static sleeve are connected by threads, the thrust bearing group is installed between the transmission shaft upper housing and the transmission shaft, the upper TC bearing static sleeve is installed between the transmission shaft housing and the thrust bearing group, and the upper TC bearing movable sleeve is threadedly connected to the transmission shaft.

[0018] The drive shaft head and the lower anti-drop housing are both shoulder-type. The drive shaft head has an annular shoulder on its upper end. The lower anti-drop housing is passed over the head end of the drive shaft body and connected to the upper housing. The inner annular shoulder on the lower portion of the lower anti-drop housing mates with the outer annular shoulder on the drive shaft head.

[0019] In this device, the upper housing of the transmission shaft and the lower anti-drop housing of the transmission shaft are connected, and then cooperate with the shaft head of the transmission shaft. Without additional components, the failed part is prevented from falling, ensuring underground safety.

[0020] It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications 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 screw drill transmission shaft housing anti-drop mechanism, characterized by: It includes a transmission shaft, a lower TC bearing movable sleeve, a lower TC bearing static sleeve, a thrust bearing group, a transmission shaft upper housing, a transmission shaft lower anti-drop housing, an upper TC bearing static sleeve, and an upper TC bearing movable sleeve; the transmission shaft upper housing and the transmission shaft lower anti-drop housing are connected together, the lower TC bearing movable sleeve and the transmission shaft are connected together through threads, the transmission shaft housing and the lower TC bearing static sleeve are connected through threads, the thrust bearing group is installed between the transmission shaft upper housing and the transmission shaft, the upper TC bearing static sleeve is installed between the transmission shaft housing and the thrust bearing group, and the upper TC bearing movable sleeve is threadedly connected to the transmission shaft.

2. The screw drill transmission shaft housing anti-drop mechanism according to claim 1, characterized in that: There is an annular shoulder on the upper part of the shaft head end of the transmission shaft, and the lower anti-drop shell of the transmission shaft is connected to the upper shell of the transmission shaft by the shaft head end of the transmission shaft shaft body, and the inner annular shoulder of the lower part of the anti-drop shell of the transmission shaft cooperates with the outer annular shoulder of the shaft head of the transmission shaft.

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