Movable wall repairing device while drilling

Abstract

The utility model relates to a movable wall repairing device while drilling, which is used in petroleum, natural gas and geological well drilling. According to the technical scheme, the movable wall repairing device while drilling is composed of a body, a rotating resistance reducing layer, a well repairing friction and torque reducing sleeve and a plug. The rotating resistance-reducing layer is installed on the body, the well repairing friction-reducing and torque-reducing sleeve is installed outside the rotating resistance-reducing layer, one ends of the rotating resistance-reducing layer and the well repairing friction-reducing and torque-reducing sleeve are positioned through a shaft shoulder of the body, the other ends of the rotating resistance-reducing layer and the well repairing friction-reducing and torque-reducing sleeve are positioned through threaded connection of the plug and the body, and hard alloy is welded on the outer surface of the well repairing friction-reducing and torque-reducing sleeve which is provided with a diversion trench. The friction-reducing and torsion-reducing sleeve for well repair is simple in structure, rubber materials used by the rotary resistance-reducing layer have the advantages of being good in abrasion resistance, low in friction coefficient and the like, the friction-reducing and torsion-reducing sleeve for well repair can correct well walls and reduce friction and torsion, and the friction-reducing and torsion-reducing sleeve for well repair can be used for deflecting operation and bent borehole drilling in vertical wells, horizontal wells and large-displacement directional wells and can reduce friction and torsion and trim well walls in the drilling process. The power transmission loss of the drill column is reduced.

Description

Technical Field

[0001] The utility model relates to a movable under-reamer for oil, natural gas and geological drilling, which is particularly suitable for reducing downhole friction and torque in vertical wells, horizontal wells and extended reach directional wells. Background Art

[0002] With the continuous deepening of oil and gas exploration and development, the drilling workload of deep wells, ultra-deep wells and extended reach wells is increasing day by day. There are problems such as cuttings accumulation, irregular wellbore and rough wellbore wall in the drilling of complex wellbores. This problem increases the downhole friction, making downhole tools prone to wear and scrapping during use. Moreover, cuttings accumulation, irregular wellbore and rough wellbore wall will also lead to low drill pressure transmission efficiency and drag pressure phenomenon, affecting the improvement of drilling speed and efficiency. This problem has always been one of the main problems restricting the improvement of drilling speed and efficiency and safe production in complex well drilling.

[0003] In recent years, domestic and foreign attention to this problem has been increasing day by day. In-depth research has been carried out both theoretically and experimentally, and a series of friction and torque reduction tools and wellbore trimming tools have been proposed. However, at present, related products at home and abroad have the problem of single functions of friction and torque reduction and wellbore trimming. The simultaneous use of these two types of tools will lead to a complex drill string assembly.

[0004] To solve the problem that existing tools have single functions and cannot simultaneously meet the functions of friction and torque reduction and wellbore trimming, on the basis of existing research, this patent proposes a rotary drag reduction layer workover friction and torque reduction tool, which can reduce friction and torque and trim the wellbore during the drilling process, reduce the loss of drill string power transmission, and achieve the improvement of drilling efficiency. Summary of the Invention

[0005] The purpose of the utility model is: in order to effectively reduce the frictional torque and drag pressure phenomenon during the drilling process, improve the drill pressure transmission efficiency and the service life of drill tools, a movable under-reamer is provided.

[0006] To achieve the above purpose, the technical solution adopted by the utility model to solve this problem is: a movable under-reamer mainly consists of a body, a rotary drag reduction layer, a workover friction and torque reduction sleeve, and a plug; its characteristics are: the rotary drag reduction layer is installed on the shaft of the body, and the workover friction and torque reduction sleeve is installed outside; the rotary drag reduction layer and the workover friction and torque reduction sleeve are positioned with the body through the shoulder and plug of the body, and the outer surface of the workover friction and torque reduction sleeve is welded with hard alloy and provided with a diversion groove.

[0007] The workover friction and torque reduction sleeve includes an integral workover friction and torque reduction sleeve and a split workover friction and torque reduction sleeve.

[0008] One side of the split workover friction and torque reduction sleeve is connected by a hinge, and the other side is connected by a screw.

[0009] The outer surface of the workover friction and torque reduction sleeve is spray-welded with 10-20 mm thick cemented carbide, and diversion grooves are opened in the cemented carbide layer. 4-6 diversion grooves are axially opened, and 3-5 diversion grooves are helically opened circumferentially, with a helix angle of 30°-45°.

[0010] One type of the rotation resistance reduction layer is a synthetic rubber of polytetrafluoroethylene and polyurethane, and the other type is cemented carbide.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows: 1) The rotating components of the tool are composed of a rotation resistance reduction layer, a workover friction and torque reduction sleeve, or a workover friction and torque reduction sleeve with a sintered cemented carbide layer, with a low friction coefficient and good wear resistance. The outer surface of the workover friction and torque reduction sleeve is welded with cemented carbide, having good wear resistance; 2) A nickel-based alloy with high wear resistance, low hardness and certain self-lubricating effect is spray-welded on the surface of the body shaft and the inner hole of the workover friction and torque reduction sleeve, which can effectively reduce the rotational friction resistance of the tool, reduce tool wear and prevent the workover friction and torque reduction sleeve from getting stuck. Description of the Drawings

[0012] Figure 1 is a schematic structural diagram of the first embodiment of a movable whipstock of the present utility model;

[0013] Figure 2 is a schematic structural diagram of the rotating component of the first embodiment of a movable whipstock of the present utility model;

[0014] Figure 3 is a schematic external three-dimensional structural diagram of the first embodiment of a movable whipstock of the present utility model;

[0015] Figure 4 is a schematic structural diagram of the second embodiment of a movable whipstock of the present utility model;

[0016] Figure 5 is a schematic structural diagram of the split workover friction and torque reduction sleeve of the second embodiment of a movable whipstock of the present utility model;

[0017] In the figure: 1. Body, 2. Rotation resistance reduction layer, 3. Workover friction and torque reduction sleeve, 4. Plug Detailed Embodiments

[0018] According to Figure 1 — Figure 5As shown in the figure, the rotating drag reduction layer 2 is composed of a cemented carbide layer and a composite material layer according to different materials. The composite material layer is a synthetic rubber of polytetrafluoroethylene and polyurethane; the workover friction and torque reduction sleeve 3 is divided into an integral workover friction and torque reduction sleeve and a split workover friction and torque reduction sleeve. One side of the split workover friction and torque reduction sleeve is connected by a hinge, and the other side is connected by screws; the body 1 is divided into a single shoulder body and a double shoulder body. The single shoulder body and the plug 4 are axially fixed to the rotating drag reduction layer 2 and the integral workover friction and torque reduction sleeve through threaded connection; the double shoulder body realizes axis fixation by the two end shoulders.

[0019] As Figures 1-3 shown. A movable drill-through wall repair tool of the present invention is composed of a body 1, a rotating drag reduction layer 2, a workover friction and torque reduction sleeve 3, and a plug 4; characterized in that: a nickel-based alloy with high wear resistance, low hardness and certain self-lubricating effect is spray-welded on the shaft surface of the body 1; the rotating drag reduction layer 2 is installed on the shaft of the body 1, and the workover friction and torque reduction sleeve 3 installed outside is an integral workover friction and torque reduction sleeve. One end of the rotating drag reduction layer 2 and the workover friction and torque reduction sleeve 3 is positioned by the shoulder of the body 1 shaft, and the other end is positioned by the threaded connection between the plug 4 and the body 1. The outer surface of the workover friction and torque reduction sleeve 3 is welded with cemented carbide and provided with a diversion groove;

[0020] As Figures 4-5 shown, the second embodiment thereof is composed of a body 1, a rotating drag reduction layer 2, and a workover friction and torque reduction sleeve 3; the workover friction and torque reduction sleeve 3 is a split workover friction and torque reduction sleeve, with a cemented carbide layer sintered on the inner surface, cemented carbide welded on the outer surface, and provided with a diversion groove, and is connected to the shaft of the body 1 by screws; the body 1 is a double shoulder body, and both ends of the workover friction and torque reduction sleeve 3 are positioned by the shoulders of the body 1 shaft, and a cemented carbide layer is sintered on the outer surface of the body 1 that cooperates with the workover friction and torque reduction sleeve 3.

[0021] The outer surface of the workover friction and torque reduction sleeve 3 is spray-welded with a 10-20 mm thick cemented carbide, and diversion grooves are opened in the cemented carbide layer. 4-6 diversion grooves are axially opened, and 3-5 diversion grooves are spirally opened circumferentially, with a spiral angle of 30°-45°. The diversion grooves are used to discharge crushed rock chips. A nickel-based alloy with high wear resistance, low hardness and certain self-lubricating effect is spray-welded on the inner hole of the workover friction and torque reduction sleeve 3; when the workover friction and torque reduction tool of the rotating drag reduction layer is working, the workover friction and torque reduction sleeve 3 and the body 1 can rotate relative to each other, reducing the friction between the drill string and the wellbore wall. At the same time, the cemented carbide on the outer surface of the workover friction and torque reduction sleeve 3 can repair the wellbore wall, further reducing the friction resistance.

[0022] The rotating component of the utility model is composed of a composite material layer or a cemented carbide layer and a workover friction and torque reduction sleeve, with low friction coefficient and good wear resistance. The outer surface of the workover friction and torque reduction sleeve is welded with cemented carbide, having good wear resistance; a nickel-based alloy with high wear resistance, low hardness and certain self-lubricating effect is spray-welded on the surface of the body shaft and the inner hole of the workover friction and torque reduction sleeve, which can effectively reduce the rotational friction resistance of the tool, reduce tool wear and prevent the workover friction and torque reduction sleeve from being stuck; using this tool can effectively reduce the friction resistance between the drill string and the well wall and the loss of drill string power transmission.

Claims

1. A movable under-reamer while drilling, mainly composed of a body (1), a rotating drag reduction layer (2), a workover friction and torque reduction sleeve (3), and a plug (4); characterized in that: The rotating drag reduction layer (2) is installed on the shaft of the body (1), and the workover friction and torque reduction sleeve (3) is installed on the outside; the rotating drag reduction layer (2) and the workover friction and torque reduction sleeve (3) are positioned with the body (1) through the shoulder and plug (4) of the body (1). The outer surface of the workover friction and torque reduction sleeve (3) is welded with hard alloy and provided with diversion grooves; the workover friction and torque reduction sleeve (3) has an integral workover friction and torque reduction sleeve and a split workover friction and torque reduction sleeve. One side of the split workover friction and torque reduction sleeve is connected by a hinge, and the other side is connected by screws.

2. The movable while-drilling hole wall repairing device according to claim 1, characterized in that: The outer surface of the workover friction and torque reduction sleeve (3) is spray-welded with 10-20 mm thick hard alloy, and diversion grooves are opened in the hard alloy layer. 4-6 diversion grooves are axially opened, and 3-5 diversion grooves are spirally opened circumferentially, with a spiral angle of 30°-45°.

Images