Cam type underground power device

Abstract

The utility model discloses a cam type underground power device which comprises an upper connector and an oscillation device outer shell, the right end of the upper connector is connected with the left end of a middle shell through pipe threads, and the middle shell is connected with a lower connector through pipe threads. An upper end cover and an oscillation device outer shell are placed in the middle shell; the oscillation device outer shell is connected with the lower bearing end cover in a through hole shaft clearance fit mode, a static cam is further connected into the middle shell in a threaded mode, and the drill bit connector is connected with the movable cam in a threaded mode. The cam type underground power device is a composite tool which is provided with a high-frequency pulse oscillation load and a high-frequency axial pulse load so as to assist rock breaking; according to the cam type underground power device, the problems of poor drillability, low mechanical rotating speed, long drilling period and the like in the drilling process of a deep well hard formation can be well solved, the drilling speed is increased, and meanwhile the stick-slip phenomenon of a PDC drill bit is effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of downhole power device, concretely to a cam type downhole power device. BACKGROUND

[0002] Downhole power can be provided by screw drill or turbine drill, or can be obtained by using electric motor. However, electric drill is almost not used in China, and the other two downhole drills have their own shortcomings: screw drill is not suitable for high-density and deep well operation, and turbine drill is long, complex in structure, troublesome in installation and adjustment of axial gap, high in rotating speed and low in torque.

[0003] There are many types of existing downhole power devices, but there are certain deficiencies in use. The common practice of the existing downhole power device is to connect in series, lengthen screw motor or improve the structure and shape of turbine drill. Screw drill and turbine drill are two different types of devices, and their advantages and disadvantages are complementary. In order to solve the above-mentioned defects, reference can be made to the flow channel type downhole power device disclosed in the prior art (Chinese patent with application number CN200720082098.5 and publication date 2008-09-03). The downhole power device is simple in structure, full of metal elements, low in rotating speed, large and stable in torque, suitable for directional well and horizontal well operation. The cross-sectional area of the flow channel is large and there is no rubber element, which is suitable for high-density, high-temperature deep well and complex well operation.

[0004] Although the above-mentioned device can solve the above-mentioned problems, it still has problems of poor drillability, low mechanical rotating speed, long drilling period and the like in the process of drilling hard formation in deep well, and the existing circumferential oscillation load device has unsatisfactory effect in deep well.

[0005] Therefore, the cam type downhole power device can well solve the above-mentioned problems. CONTENT OF THE UTILITY MODEL

[0006] The utility model aims at providing a cam type downhole power device to solve the problems of poor drillability, low mechanical rotating speed, long drilling period and the like in the process of drilling hard formation in deep well, and the unsatisfactory effect of the existing circumferential oscillation load device in deep well.

[0007] To achieve the above object, the utility model provides the following technical scheme: a cam type downhole power device, including upper joint and oscillation device shell body, the right end of upper joint is connected through pipe thread connection with the left end of intermediate casing, the intermediate casing is connected together with lower joint through pipe thread connection, the inside of intermediate casing is placed with upper end cover and oscillation device shell body, the upper end cover and oscillation device shell body are connected through hole shaft clearance fit, the one side of upper end cover and filter unit are connected together through hole shaft clearance fit and then welded, the oscillation device shell body and lower supporting end cover are connected through hole shaft clearance fit, the inside position of lower supporting end cover is also connected in the inside position of throttling water nozzle through thread, the outside of oscillation device shell body is connected with thrust bearing through hole shaft clearance fit, the oscillation device shell body and thrust bearing are placed in the inside of intermediate casing and contact with casing step surface, the oscillation device shell body and drill bit joint are connected together through pipe thread connection, the inside of intermediate casing is also connected with static cam through thread, the drill bit joint and dynamic cam are connected through thread.

[0008] As the preferred technical scheme of the application, the outside of the oscillation device shell body is connected with a thrust bearing through hole shaft clearance fit, the oscillation device shell body and the thrust bearing are placed in the inside of the intermediate casing and contact with the casing step surface, the outside of the oscillation device shell body is connected with the drill bit joint through pipe thread connection, the inside of the intermediate casing is also connected with a static cam through thread, and the drill bit joint and the dynamic cam are connected through thread.

[0009] As the preferred technical scheme of the application, the inside of the oscillation device shell body is also placed with a fluid reversing unit and a fluid oscillation device, and the fluid reversing unit and the fluid oscillation device are connected through hole shaft clearance fit, and the side surface of the fluid reversing unit and the side surface of the lower supporting end cover are in contact with each other.

[0010] As the preferred technical scheme of the application, the fluid reversing unit can rotate freely at the side position of the lower supporting end cover.

[0011] As the preferred technical scheme of the application, the upper end cover and the oscillation device shell body are connected together through hole shaft clearance fit and then fixed together by screws.

[0012] As the preferred technical scheme of the application, non-uniformly distributed sawteeth are arranged between the static cam and the dynamic cam, the static cam and the dynamic cam are disengaged to generate downward axial pulse load, and the static cam and the dynamic cam are engaged to generate upward axial pulse load.

[0013] Compared with the prior art, the cam type downhole power device has the following beneficial effects: the cam type downhole power device has a composite tool with high-frequency pulse oscillation load and high-frequency axial pulse load to assist in rock breaking; the cam type downhole power device can better solve the problems of poor drillability, low mechanical rotation speed and long drilling cycle in the drilling process of deep well hard formation, improve the drilling speed, effectively reduce the occurrence of PDC drill bit stick-slip phenomenon, and protect the drill bit.

[0014] 1. The fluid oscillation device generates high-frequency circumferential oscillation load, and the oscillation device drives the dynamic cam to move in a circumferential direction, so that the dynamic cam and the static cam alternately disengage and engage to generate axial pulse load.

[0015] 2. The static cam and the dynamic cam are provided with non-uniformly distributed sawteeth at the position where they contact each other, axial pulse load in different directions can be generated through the disengagement and engagement between the static cam and the dynamic cam, thereby solving the problems of poor drillability, low mechanical rotation speed and long drilling cycle in the drilling process of deep well hard formation, improving the drilling speed, effectively reducing the occurrence of PDC drill bit stick-slip phenomenon, and achieving the purpose of protecting the drill bit. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a front view structural schematic diagram of the utility model;

[0017] Figure 2 It is a front view structural schematic diagram of the utility model Figure 1 It is an enlarged structural schematic diagram of position A in the utility model;

[0018] Figure 3 It is an exploded structural schematic diagram of the static cam and the dynamic cam of the utility model;

[0019] Figure 4 It is a schematic diagram of the disengagement state of the cam and the static cam of the utility model;

[0020] Figure 5 It is a schematic diagram of the engagement state of the static cam and the dynamic cam of the utility model.

[0021] In the drawing: 1, upper joint; 2, middle shell; 3, filtering unit; 4, upper end cover; 5, fluid reversing unit; 6, fluid oscillation device; 7, oscillation device outer shell; 8, lower supporting end cover; 9, throttling nozzle; 10, thrust bearing; 11, lower joint; 12, drill bit joint; 13, static cam; 14, dynamic cam. DETAILED DESCRIPTION

[0022] Clearly and completely, the technical solutions in the embodiments of the present application will be described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor belong to the scope of protection of the present application.

[0023] Please refer to Figures 1-5 The present application provides the following technical solutions:

[0024] Embodiments

[0025] In order to solve the problems of poor drillability, low mechanical rotation speed, long drilling cycle and other problems in the drilling process of deep well hard formation on the market at present, and the problem of unsatisfactory use effect of the existing circumferential oscillation load device in deep well, reference can be made to the accompanying drawings Figure 1 -Appendix Figure 4, including the upper joint 1 and the oscillation device shell 7, the right end of the upper joint 1 is connected with the left end of the intermediate shell 2 through pipe thread, the intermediate shell 2 and the lower joint 11 are connected together through pipe thread; the inside of the intermediate shell 2 is placed with the upper end cover 4 and the oscillation device shell 7, the upper end cover 4 and the oscillation device shell 7 are connected through hole shaft gap fit, one side of the upper end cover 4 and the filter unit 3 are connected through hole shaft gap fit and then welded; the oscillation device shell 7 and the lower supporting end cover 8 are connected through hole shaft gap fit, the inside of the lower supporting end cover 8 is also threadedly connected with the inside of the throttling water nozzle 9; the outside of the oscillation device shell 7 is connected with the thrust bearing 10 through hole shaft gap fit, the oscillation device shell 7 and the thrust bearing 10 are placed in the inside of the intermediate shell 2 and contact with the shell step surface, the oscillation device shell 7 and the drill bit joint 12 are connected together through pipe thread, the inside of the intermediate shell 2 is also threadedly connected with the static cam 13, the drill bit joint 12 and the dynamic cam 14 are also connected through thread; the outside of the oscillation device shell 7 is connected with the thrust bearing 10 through hole shaft gap fit, the oscillation device shell 7 and the thrust bearing 10 are placed in the inside of the intermediate shell 2 and contact with the shell step surface, the outside of the oscillation device shell 7 is connected with the drill bit joint 12 through pipe thread, the inside of the intermediate shell 2 is also threadedly connected with the static cam 13, the drill bit joint 12 and the dynamic cam 14 are also connected through thread; the inside of the oscillation device shell 7 is also placed with the fluid reversing unit 5 and the fluid oscillation device 6, and the fluid reversing unit 5 and the fluid oscillation device 6 are connected through hole shaft gap fit, one side of the fluid reversing unit 5 and one side of the lower supporting end cover 8 are in contact with each other; the fluid reversing unit 5 can rotate freely at one side of the lower supporting end cover 8; the upper end cover 4 and the oscillation device shell 7 are connected together through hole shaft gap fit and then fixed together by screw; the static cam 13 and the dynamic cam 14 are provided with non-uniformly distributed sawteeth, the static cam 13 and the dynamic cam 14 are disengaged, generating downward axial pulse load, the static cam 13 and the dynamic cam 14 are engaged, generating upward axial pulse load.

[0026] In the working process of the cam type downhole power device, drilling fluid flows into the central pipe, under the action of the throttling water nozzle 9, the drilling fluid pressure rises, and the pressure difference is generated before and after the throttling water nozzle 9, the upper end of the throttling water nozzle 9 is a high-pressure flow channel, and the lower end is a low-pressure flow channel; under the adjustment of the fluid reversing unit 5, the two end pressure cavities of the fluid oscillation device 6 are periodically alternately connected with the high-pressure flow channel and the low-pressure flow channel, and the pressure difference in the high-pressure and low-pressure cavities drives the fluid oscillation device 6 to reciprocate in the circumferential direction, generating circumferential oscillation load; as follows Figure 2As shown, the static cam 13 is connected to the middle casing 2 by screwing, the dynamic cam 14 is connected to the drill bit joint 12 by screwing, the static cam 13 and the dynamic cam 14 have non-uniformly distributed sawteeth; when the fluid oscillation device 6 oscillates, the drill bit joint 12 is driven to rotate, and in turn the dynamic cam 14 and the sawteeth of the static cam 13 alternately appear disengaged and engaged; when the dynamic cam 14 and the static cam 13 are disengaged, downward axial pulse load is generated, when the static cam 13 and the dynamic cam 14 are engaged, upward axial pulse load is generated; the fluid oscillation device 6 generates a torsional oscillation load and an axial pulse load once per oscillation, both have the same frequency, the tool with the circumferential oscillation load and the axial pulse load is called a cam downhole power device; the cam downhole power device can better solve the problems of poor drillability, low mechanical rotation speed, long drilling period and the like in the process of drilling in deep hard formation, improve the drilling speed, effectively reduce the occurrence of PDC drill bit stick-slip phenomenon, and protect the drill bit.

[0027] The contents not described in detail in the specification belong to the prior art known to those skilled in the art.

[0028] Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features, any modification, equivalent replacement, improvement and the like made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A cam type downhole power device, comprising an upper joint (1) and an oscillation device outer shell (7), the right end of the upper joint (1) and the left end of an intermediate shell (2) are connected by pipe thread, the intermediate shell (2) and a lower joint (11) are connected by pipe thread; characterized in that The inside of the intermediate shell (2) is placed with an upper end cover (4) and an oscillation device outer shell (7), the upper end cover (4) and the oscillation device outer shell (7) are connected by hole shaft gap fit, one side of the upper end cover (4) and the filter unit (3) are connected by hole shaft gap fit and then welded; The oscillation device outer shell (7) and the lower supporting end cover (8) are connected by hole shaft gap fit, the inside of the lower supporting end cover (8) is also threadedly connected to the inside of the throttling nozzle (9); The outside of the oscillation device outer shell (7) is connected with a thrust bearing (10) by hole shaft gap fit, the oscillation device outer shell (7) and the thrust bearing (10) are placed in the inside of the intermediate shell (2) and contact with the shell step surface, the oscillation device outer shell (7) and the drill bit joint (12) are connected by pipe thread, the intermediate shell (2) is also threadedly connected with a static cam (13), the drill bit joint (12) and a dynamic cam (14) are also connected by thread.

2. A cammed downhole power device according to claim 1, wherein: The outside of the oscillation device outer shell (7) is connected with a thrust bearing (10) by hole shaft gap fit, the oscillation device outer shell (7) and the thrust bearing (10) are placed in the inside of the intermediate shell (2) and contact with the shell step surface, the outside of the oscillation device outer shell (7) is connected with the drill bit joint (12) by pipe thread, the intermediate shell (2) is also threadedly connected with a static cam (13), the drill bit joint (12) and a dynamic cam (14) are also connected by thread.

3. A cam type downhole power device according to claim 1, characterized in that: The inside of the oscillation device outer shell (7) is also placed with a fluid reversing unit (5) and a fluid oscillation device (6), and the fluid reversing unit (5) and the fluid oscillation device (6) are connected by hole shaft gap fit, one side of the fluid reversing unit (5) and one side of the lower supporting end cover (8) are in contact with each other.

4. A cam type downhole power device according to claim 3, characterized in that: The fluid reversing unit (5) can rotate freely at one side of the lower supporting end cover (8).

5. A cammed downhole power device according to claim 1, wherein: The upper end cover (4) and the oscillation device outer shell (7) are connected by hole shaft gap fit and then fixed together by screws.

6. A cam type downhole power device according to claim 1, characterized in that: The static cam (13) and the dynamic cam (14) are provided with non-uniformly distributed sawteeth, the static cam (13) and the dynamic cam (14) are disengaged to generate downward axial pulse load, the static cam (13) and the dynamic cam (14) are engaged to generate upward axial pulse load.

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