Non-pitching type safe releasing tool

Abstract

The utility model discloses a non-pitching type safety releasing tool which comprises an upper spline body, a lower spline body, a connecting shaft, a bypass short section, a spring rod, a spring, a pressure conductor, a belleville spring, a transmission body and a transmission connector. The connecting shaft is connected with the spring rod and installed in the lower spline body and an upper inner cavity of the bypass short section respectively, and the spring rod is sleeved with the spring. The belleville spring and the transmission body are sequentially arranged on the transmission connector in a sleeving mode from top to bottom, the pressure conduction body is connected to the upper end of the transmission connector, and the two ends of the belleville spring are connected with the pressure conduction body and the transmission body respectively. As the last means for handling drill jamming accidents, the tool is controlled through mechanical hydraulic pressure, the tool is a while-drilling tool which finally achieves releasing of the drilling tool by lifting the drilling tool to the designed tonnage, controlling the designed displacement circulation and conducting right-handed rotation and unscrewing, the structure is simple, the control method is simple, convenient and flexible, multiple times of activation can be achieved, and the drilling tool is convenient to use. And the method has very high application value.

Description

Technical Field

[0001] The utility model relates to a non-ball throwing type safety releasing tool, belonging to the technical field of oil drilling and completion operations. Background Art

[0002] During drilling and completion operations, drill bit stuck accidents often occur due to factors such as formation and drilling parameters. With the development of rapid drilling technology, the lower drill string assembly contains more and more expensive downhole drilling tools and ancillary instruments. When a drill bit stuck accident occurs, it is inevitable that the lower drill string and expensive downhole drilling tools and ancillary instruments will be buried or milled.

[0003] In view of the above problems, existing technologies for handling stuck drill accidents mostly use methods such as reverse cutting, explosive loosening, and downhole cutting, which are difficult to ensure that all the fallen fish can be salvaged to the greatest extent.

[0004] How to accurately remove the drilling tools (including downhole drilling tools and auxiliary instruments) above the stuck point and reduce the accident time and asset loss is a problem that needs to be solved urgently by technical personnel in this field. Utility Model Content

[0005] The utility model aims to provide a non-ball throwing type safe hand-release tool to solve the problems existing in the prior art.

[0006] The utility model provides a technical solution to solve the above technical problems: a non-ball throwing type safety hand-release tool, comprising an upper spline body, a lower spline body, a connecting shaft, a bypass short section, a spring rod, a spring, a pressure conductor, a butterfly spring, a transmission body, and a transmission joint;

[0007] The inner cavity of the bypass sub includes an upper inner cavity, a middle inner cavity, and a lower inner cavity, and the inner cavity diameters of the upper inner cavity and the lower inner cavity are both larger than the inner cavity diameter of the middle inner cavity;

[0008] The upper half of the outer wall of the connecting shaft is provided with a spline, and the upper spline body and the lower spline body are both provided with a spline groove matching the spline;

[0009] The connecting shaft is connected to the spring rod and is respectively installed in the upper inner cavity of the lower spline body and the bypass short section. The spring is sleeved on the spring rod, and the spring rod presses the spring on the end surface of the middle inner cavity of the bypass short section.

[0010] The upper spline body, the lower spline body, and the bypass short section are connected in sequence, and the upper half of the connecting shaft extends into the spline groove of the upper spline body;

[0011] The butterfly spring and the transmission body are sequentially sleeved on the transmission joint from top to bottom, the pressure conductor is connected to the upper end of the transmission joint, and the two ends of the butterfly spring are respectively connected to the pressure conductor and the transmission body; the upper end of the transmission joint is installed in the lower inner cavity of the bypass short section, and the upper end surface of the pressure conductor is closely attached to the lower end surface of the inner cavity of the bypass short section; the upper end of the transmission body is connected to the lower inner cavity of the bypass short section;

[0012] A pressure relief hole is axially provided in the bypass nipple, and the two ends of the pressure relief hole are respectively connected with the upper inner cavity and the lower inner cavity. A bypass hole connected with the lower inner cavity is radially provided in the bypass nipple, and the bypass hole is located between the pressure conductor and the transmission body; a pressure transmission hole is radially provided at the upper end of the spring rod; and an annular groove connected with the pressure relief hole is provided at the upper end of the pressure conductor.

[0013] A further technical solution is that threaded connections are formed between the upper spline body and the lower spline body, between the lower spline body and the bypass short section, between the connecting shaft and the spring rod, between the transmission body and the bypass short section, and between the pressure conductor and the transmission joint.

[0014] A further technical solution is that the upper and lower ends of the lower spline body are respectively provided with a left-handed female thread and a right-handed male thread.

[0015] A further technical solution is that the upper and lower ends of the upper spline body are respectively provided with a right-handed female thread and a left-handed male thread.

[0016] A further technical solution is that the upper and lower ends of the bypass nipple are respectively provided with right-handed female threads and right-handed female threads.

[0017] A further technical solution is that a right-handed male thread is provided on the outer wall of the upper end of the transmission body.

[0018] A further technical solution is that the pressure conductor has a protrusion extending to the central inner cavity.

[0019] A further technical solution is that an O-ring for sealing the gap between the pressure conductor and the inner cavity of the bypass nipple is provided on the pressure conductor, and the O-ring is located between the annular groove and the bypass hole.

[0020] A further technical solution is that the number of the splines is six and they are evenly distributed on the outer wall of the connecting shaft.

[0021] A further technical solution is that the number of splines on the connecting shaft corresponds to and is equal to the number of spline grooves on the upper spline body and the lower spline body.

[0022] The utility model has the following beneficial effects: when the utility model is in normal working state, the pressure needs to be in a self-locking state, the spring and the disc spring are in a pre-compressed state, the bypass hole on the bypass short section is isolated from the pressure chamber, and the spring rod is always in the original state by using the principle of liquid incompressibility. When the lower drilling tool is stuck, the stuck point is located below the device of the utility model, and pressure relief is required, so that when the spring rod and the spring are compressed, the lifting drilling tool is greater than the designed disc spring tonnage, overcoming the disc spring compression load, the disc spring is in a compressed state, and the compression displacement is connected with the bypass hole to the annular groove of the pressure conductor, so that the pressure chamber is connected with the annulus, the drilling fluid displacement is greater than the designed displacement, and the thrust generated by the pressure drop pushes the spring rod downward.

[0023] The utility model is a last resort for handling drill stuck accidents. The tool is controlled by mechanical hydraulics, and finally achieves the release of the drill tool by pulling the drill tool to the designed tonnage, controlling the designed displacement cycle, and rotating the button in right direction. The utility model has a simple structure, a simple and flexible control method, can be activated multiple times, and has a high application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the initial state structure of the utility model;

[0025] Figure 2 for Figure 1 Schematic diagram of the cross section in the middle BB direction;

[0026] Figure 3 for Figure 1 Schematic diagram of the cross section in the CC direction;

[0027] Figure 4 It is a schematic diagram of the structure of the utility model in a separated state;

[0028] Figure 5 for Figure 3 Schematic diagram of the cross section in the EE direction;

[0029] Figure 6 for Figure 3 Schematic diagram of the cross section in the FF direction.

[0030] As shown in the figure: 1-upper spline body, 2-lower spline body, 3-connecting shaft, 4-bypass short section, 5-spring rod, 6-spring, 7-pressure conductor, 8-butterfly spring, 9-transmission body, 10-transmission joint, 11-O-ring. DETAILED DESCRIPTION

[0031] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0035] like Figure 1-Figure 6 As shown, the utility model provides a non-ball throwing type safety hand-release tool, comprising an upper spline body 1, a lower spline body 2, a connecting shaft 3, a bypass short section 4, a spring rod 5, a spring 6, a pressure conductor 7, a butterfly spring 8, a transmission body 9, and a transmission joint 10;

[0036] The connecting shaft 3, the spring rod 5, the pressure conductor 7, and the transmission joint 10 all have hollow flow passages; the upper spline body 1, the lower spline body 2, and the bypass short section 4 all have cavities;

[0037] The inner cavity of the bypass sub 4 includes an upper inner cavity, a middle inner cavity, and a lower inner cavity, and the inner cavity diameters of the upper inner cavity and the lower inner cavity are both larger than the inner cavity diameter of the middle inner cavity;

[0038] The upper half of the outer wall of the connecting shaft 3 is provided with a spline, and the upper spline body 1 and the lower spline body 2 are both provided with a spline groove matching the spline;

[0039] The spring rod 5 includes a threaded connection section, a middle section, and a lower section, wherein the diameter of the middle section is larger than that of the lower section; the connecting shaft 3 is connected to the spring rod 5 and is respectively installed in the upper inner chambers of the lower spline body 2 and the bypass short section 4, wherein the lower section of the spring rod 5 extends into the middle inner chamber, and the spring 6 is sleeved on the lower section of the spring rod 5, and the middle section end face of the spring rod 5 presses the spring 6 onto the middle inner chamber end face of the bypass short section 4; the upper spline body 1, the lower spline body 2, and the bypass short section 4 are connected in sequence, and the upper half of the connecting shaft 3 extends into the spline groove of the upper spline body 1; the upper inner chamber portion between the upper end face of the middle section and the lower end face of the lower spline body 2 is the first pressure chamber; the upper inner chamber portion between the lower end face of the middle section and the upper end face of the middle inner chamber in the bypass short section 4 is the second pressure chamber;

[0040] The butterfly spring 8 and the transmission body 9 are sequentially sleeved on the transmission joint 10 from top to bottom, the pressure conductor 7 is connected to the upper end of the transmission joint 10, and the two ends of the butterfly spring 8 are respectively connected to the pressure conductor 7 and the transmission body 9; the upper end of the transmission joint 10 is installed in the lower inner cavity of the bypass short section 4, and the upper end surface of the pressure conductor 7 is in close contact with the lower end surface of the middle inner cavity of the bypass short section 4; the upper end of the transmission body 9 is connected to the lower inner cavity of the bypass short section 4; the pressure conductor 7 has a protrusion extending to the middle inner cavity;

[0041] A pressure relief hole is axially provided in the bypass nipple 4, and the two ends of the pressure relief hole are respectively connected with the second pressure chamber and the lower inner chamber. A bypass hole connected with the lower inner chamber is radially provided in the bypass nipple 4, and the bypass hole is connected with the annulus. The bypass hole is located between the pressure conductor 7 and the transmission body 9; a pressure transmission hole is radially provided at the upper end of the spring rod 5, and the pressure transmission hole is connected with the first pressure chamber; an annular groove connected with the pressure relief hole is provided at the upper end of the pressure conductor 7.

[0042] The initial state of the utility model is as follows Figure 1-3 As shown, the upper and lower spline bodies are connected externally by a left-hand thread, and are connected in series internally by a connecting shaft 3, and the rotation torque is transmitted by the connecting shaft 3 to realize normal rotation drilling; the connecting shaft 3 is connected to the spring rod 5, and the spring preload is applied to ensure that the connecting shaft 3 always handles the state of the upper and lower spline bodies in series; the bypass nipple 4 is threadedly connected to the transmission body 9, and the transmission body 9 is connected to the transmission joint 10 by a plug-in key type, and a large-tonnage disc spring 8 is installed between the pressure conductor 7 and the transmission body 9, and the tonnage of the disc spring 8 can be adjusted according to the actual requirements of the drilling tool structure, the wellbore size, the drilling lifting load, etc.

[0043] When the lower drilling tool is stuck, the stuck point is below the device of the utility model, and pressure relief is required, so that when the spring rod 5 and the spring 6 are compressed, the lifting drilling tool is greater than the designed disc spring tonnage, overcoming the disc spring compression load, and the disc spring is in a compression state. The compression displacement is connected to the annular groove from the bypass hole to the pressure conductor 7, so that the second pressure chamber is connected to the annulus.

[0044] The displacement of drilling fluid is greater than the designed displacement, and the thrust generated by the pressure drop pushes the spring rod 5 and the connecting shaft 3 downward.

[0045] The formula for calculating the driving force is:

[0046] F=ΔP*π(D 2 -d 2 ) / 4

[0047] Where: F is the driving force, KN; ΔP is the drill bit pressure drop, MPa; D is the major diameter of the pressure chamber, mm; d is the minor diameter of the pressure chamber, mm;

[0048] like Figure 4 As shown, the connecting shaft 3 moves downward and disengages from the keyway of the upper spline body 1, and the drill bit is rotated right-handed, so that the upper drill bit can be decoupled from the left-handed thread of the lower spline body of the upper spline body, thereby realizing separation of the upper and lower parts of the drill bit when handling special operations such as drill sticking accidents, and lifting the upper drill bit and other downhole drilling tools and auxiliary instruments out of the well.

[0049] In this embodiment, the preferred connection method is that the upper spline body 1 and the lower spline body 2, the lower spline body 2 and the bypass short section 4, the connecting shaft 3 and the spring rod 5, the transmission body 9 and the bypass short section 4, and the pressure conductor 7 and the transmission joint 10 are all threaded connections, and the upper and lower ends of the lower spline body 2 are respectively provided with a left-handed female thread and a right-handed male thread, the upper and lower ends of the upper spline body 1 are respectively provided with a right-handed female thread and a left-handed male thread, the upper and lower ends of the bypass short section 4 are respectively provided with a right-handed female thread and a right-handed female thread, the upper end outer wall of the transmission body 9 is provided with a right-handed male thread; the upper and lower ends of the transmission joint 10 are both provided with a right-handed male thread; the inner wall of the inner cavity of the pressure conductor 7 is provided with a right-handed female thread.

[0050] In this embodiment, in order to improve the sealing effect, a preferred implementation is that a sealing ring 11 for sealing the gap between the pressure conductor 7 and the inner cavity of the bypass nipple 4 is provided on the pressure conductor 7, and the sealing ring 11 is located between the annular groove and the bypass hole.

[0051] In this embodiment, if Figure 2 and 5 As shown, the number of the splines is six and is evenly distributed on the outer wall of the connecting shaft 3 . The number of splines on the connecting shaft 3 corresponds to and is equal to the spline grooves of the upper spline body 1 and the lower spline body 2 .

[0052] The above description does not impose any form of limitation on the present invention. Although the present invention has been disclosed through the above embodiments, it is not used to limit the present invention. Any technician familiar with the profession can make some changes or modify the technical contents disclosed above into equivalent embodiments with equivalent changes without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A non-ball throwing safety tool, characterized in that: It comprises an upper spline body (1), a lower spline body (2), a connecting shaft (3), a bypass short section (4), a spring rod (5), a spring (6), a pressure conductor (7), a butterfly spring (8), a transmission body (9), and a transmission joint (10); The inner cavity of the bypass short section (4) comprises an upper inner cavity, a middle inner cavity and a lower inner cavity, and the inner cavity diameters of the upper inner cavity and the lower inner cavity are both larger than the inner cavity diameter of the middle inner cavity; The upper half of the outer wall of the connecting shaft (3) is provided with a spline, and the upper spline body (1) and the lower spline body (2) are both provided with a spline groove matching the spline; The connecting shaft (3) is connected to the spring rod (5) and is respectively installed in the upper inner cavity of the lower spline body (2) and the bypass short section (4); the spring (6) is sleeved on the spring rod (5), and the spring rod (5) presses the spring (6) against the end surface of the middle inner cavity of the bypass short section (4); The upper spline body (1), the lower spline body (2), and the bypass short section (4) are connected in sequence, and the upper half of the connecting shaft (3) extends into the spline groove of the upper spline body (1); The butterfly spring (8) and the transmission body (9) are sequentially sleeved on the transmission joint (10) from top to bottom; the pressure conductor (7) is connected to the upper end of the transmission joint (10); the two ends of the butterfly spring (8) are respectively connected to the pressure conductor (7) and the transmission body (9); the upper end of the transmission joint (10) is installed in the lower inner cavity of the bypass short section (4); the upper end surface of the pressure conductor (7) is in close contact with the lower end surface of the inner cavity of the bypass short section (4); the upper end of the transmission body (9) is connected to the lower inner cavity of the bypass short section (4); A pressure relief hole is axially provided in the bypass nipple (4), and the two ends of the pressure relief hole are respectively connected to the upper inner cavity and the lower inner cavity. A bypass hole connected to the lower inner cavity is radially provided in the bypass nipple (4), and the bypass hole is located between the pressure conductor (7) and the transmission body (9); a pressure transmission hole is radially provided at the upper end of the spring rod (5); and an annular groove connected to the pressure relief hole is provided at the upper end of the pressure conductor (7).

2. A non-ball throwing safety tool according to claim 1, characterized in that: The upper spline body (1) and the lower spline body (2), the lower spline body (2) and the bypass short section (4), the connecting shaft (3) and the spring rod (5), the transmission body (9) and the bypass short section (4), and the pressure conductor (7) and the transmission joint (10) are all threadedly connected.

3. A non-ball throwing safety tool according to claim 2, characterized in that: The lower and upper ends of the lower spline body (2) are respectively provided with a left-handed female thread and a right-handed male thread.

4. A non-ball throwing safety tool according to claim 3, characterized in that: The upper and lower ends of the upper spline body (1) are respectively provided with a right-handed female thread and a left-handed male thread.

5. A non-ball throwing safety tool according to claim 3, characterized in that: The upper and lower ends of the bypass nipple (4) are respectively provided with a right-handed female thread and a right-handed female thread.

6. A non-ball throwing safety tool according to claim 3, characterized in that: The outer wall of the upper end of the transmission body (9) is provided with a right-handed male thread.

7. A non-ball throwing safety tool according to claim 1, characterized in that: The pressure conductor (7) has a protrusion extending to the central inner cavity.

8. A non-ball throwing safety tool according to claim 1, characterized in that: The pressure conductor (7) is provided with an O-ring (11) for sealing the gap between the pressure conductor (7) and the inner cavity of the bypass nipple (4); the O-ring (11) is located between the annular groove and the bypass hole.

9. A non-ball throwing safety tool according to claim 1, characterized in that: The number of the splines is six and they are evenly distributed on the outer wall of the connecting shaft (3).

10. A non-ball throwing safety tool according to claim 1, characterized in that: The number of splines on the connecting shaft (3) corresponds to and is equal to the number of spline grooves on the upper spline body (1) and the lower spline body (2).

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