Sleeving and fishing integrated female tap

Abstract

The invention discloses a casing and salvage integrated female tap which is used for salvaging underground fallen fish and comprises a connector, a female tap body, a casing milling barrel and a casing milling head, and the connector is detachably connected with an external drilling tool; one end of the female tap body is fixedly connected to one end of the connector, and a fishing thread is arranged in the female tap body; one end of the casing milling barrel is fixedly connected to the other end of the female tap body; and the casing milling head is arranged at the other end of the casing milling barrel. The device is simple in structure and convenient to operate, and compared with a traditional fishing technology that milling is conducted firstly and then fishing is conducted, efficiency is improved, time is saved, and cost is reduced.

Description

Technical Field

[0001] The invention relates to an underground complex processing salvage tool, in particular to a sleeve-fishing integrated female cone. Background Art

[0002] In general well repair and salvage construction, we often use the traditional method, that is, first milling to remove debris in the pipe string to provide conditions for subsequent salvage, and then salvage, salvage the fallen objects in the well one by one. This will lead to a longer construction period and increased salvage costs. In addition, for complex wellbores, if the fish top is severely damaged, the pipe string in the wellbore is deformed, covered with foreign objects, broken, buried in sand, etc., it may lead to multiple salvage failures and ultimately cannot be handled.

[0003] Therefore, how to provide a one-piece female cone that can bypass the problematic fish top and directly salvage a fallen fish body is a problem that technical personnel in this field urgently need to solve. Summary of the invention

[0004] In view of this, the present invention provides a one-piece female cone, which can salvage the fallen fish as a whole, shorten the salvage cycle, and improve the salvage efficiency.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: an integrated female cone for salvaging fish in a well, comprising a connecting head, a female cone body, a sleeve milling barrel and a sleeve milling head which are coaxially arranged in sequence and all have through holes in the axial direction, the connecting head being detachably connected to an external drilling tool; one end of the female cone body is fixedly connected to one end of the connecting head, and a salvage thread is provided in the female cone body; one end of the sleeve milling barrel is fixedly connected to the other end of the female cone body; the sleeve milling head is arranged at the other end of the sleeve milling barrel.

[0006] The beneficial effects of the present invention are as follows: a sleeve milling head and a sleeve milling barrel are arranged at the other end of the female cone body, and a connecting head is connected to an external drilling tool. Driven by the external drilling tool, the sleeve milling head clears obstacles at the fish-falling position in the well, and provides preparation conditions for the subsequent female cone to salvage the fallen fish. The fallen fish enters the female cone body, and is pressurized and rotated by the external drilling tool. The internal thread of the female cone body eats into the outer wall of the fallen fish to perform tapping and buckling, and the fallen fish is salvaged as a whole. Compared with the traditional salvage technology of first sleeve milling and then salvaging, the efficiency is improved, time is saved, and cost is reduced.

[0007] Preferably, the inner diameter of the salvage thread of the female cone body is gradually increased from one end to the other end, and the end with a smaller inner diameter of the salvage thread is close to the connector, and the end with a larger inner diameter of the salvage thread is close to the sleeve milling barrel.

[0008] Preferably, the salvage thread is 8 threads / 25.4 mm, and the thread taper is 1:16.

[0009] Preferably, the thread surface of the salvage thread is carburized and quenched, the depth of the carburized layer is 0.8 mm, and the surface hardness of the salvage thread is HRC60-65.

[0010] Preferably, the connector, the female cone body and the sleeve milling cylinder are integrally fixed and formed.

[0011] Preferably, the sleeve milling head is in the shape of an annular cutting tooth, is made of cemented carbide, and is welded to the other end of the sleeve milling barrel.

[0012] Preferably, the outer diameter of the milling barrel is 6-8 mm smaller than the inner diameter of the well.

[0013] Preferably, the length of the female cone body is 80-120 mm.

[0014] Preferably, the through holes of the connector gradually increase from close to the female cone body to the other end. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic cross-sectional view of the integrated female cone along the central axis of the present invention.

[0016] 1 connecting head, 2 female cone bodies, 3 sets of milling barrels, 4 sets of milling heads. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] See the attached Figure 1 According to an embodiment of the present invention, a one-piece female cone for salvaging fish in a well includes a connector 1, a female cone body 2, a sleeve milling barrel 3 and a sleeve milling head 4 which are coaxially arranged in sequence and all have through holes in the axial direction, wherein the connector 1 is detachably connected to an external drilling tool; one end of the female cone body 2 is fixedly connected to one end of the connector 1, and a salvage thread 5 is provided in the female cone body 2; one end of the sleeve milling barrel 3 is fixedly connected to the other end of the female cone body 2; and the sleeve milling head 4 is arranged at the other end of the sleeve milling barrel 3.

[0019] In some specific embodiments, the inner diameter of the salvage thread of the female cone body 2 is gradually increased from one end to the other, and the end with a smaller inner diameter of the salvage thread is close to the connector 1 , and the end with a larger inner diameter of the salvage thread is close to the sleeve milling tube 3 .

[0020] Specifically, the salvage thread 5 is 8 turns / 25.4 mm, and the thread taper is 1:16.

[0021] In other embodiments, the thread surface of the salvage thread 5 is carburized and quenched, the carburized layer depth is 0.8 mm, and the surface hardness of the salvage thread 5 is HRC60-65, thereby improving the salvage stability of the salvage tool.

[0022] In other specific embodiments, the connector 1, the female cone body 2 and the sleeve milling barrel 3 are integrally fixed and formed. The integral casting is made by turning and milling at one time, which has higher reliability and safety.

[0023] In some other embodiments, the sleeve milling head 4 is in the shape of an annular cutting tooth, is made of cemented carbide, and is welded to the other end of the sleeve milling cylinder 3 .

[0024] Specifically, advanced oxygen welding technology is used to weld special cutting teeth and hard alloy on the periphery of the sleeve milling head, which is strong and wear-resistant, and improves the sleeve milling ability of the tool.

[0025] In some other specific embodiments, the outer diameter of the milling barrel 3 is 6-8 mm smaller than the inner diameter of the well, so that the fish can be effectively introduced into the milling barrel without damaging the fish during the milling process, thereby ensuring effective cleaning of the annulus stuck points.

[0026] In some other specific embodiments, the length of the female cone body 2 is 80-120 mm.

[0027] Specifically, the connector is processed according to the on-site drilling tool size, and the sleeve milling barrel is determined according to the on-site fish drop size and wellbore size.

[0028] More specifically, the outer diameter of the female cone body is machined according to the inner diameter of the wellbore, and the outer diameters of the female cone body and the connection between the sleeve milling barrel are the same.

[0029] Furthermore, the through hole of the connector 1 increases gradually from the vicinity of the female cone body 2 to the other end.

[0030] By adopting the integrated female cone of the present invention, the milling and salvaging operation can be carried out in one trip, which saves time and reduces risks; and the tool structure is simple, convenient and fast to use.

[0031] The specific operation process of the integrated female cone and the external drilling tool for fishing fish in the present invention is as follows:

[0032] The upper end thread of the connector 1 is connected to the drill bit. Before entering the well, accurately measure the dimensions of each part, lower the pipe string to a predetermined depth, and slowly lower it. After the sleeve milling head 4 touches the upper end of the fish head, observe the changes in the hanging weight indicator and the pump pressure gauge, slowly start the turntable, observe the changes in the hanging weight and torque, indicating that the tool is introduced, and continue to lower the pipe string. If there is an obstruction or the hanging weight changes, use a small drilling pressure sleeve milling. Combine the measured and recorded end face dimensions of the sleeve milling head 4 and the female cone body 2, and compare the lowering distance of the pipe string. When the lowering footage of the pipe string is equal to the sum of the sleeve milling head 4 and the sleeve milling barrel 3, observe the changes in the parameter instrument. When the fish enters the salvage cavity of the female cone body 2, appropriately increase the drilling pressure. Under the action of the drilling tool pressure and torque, the sleeve and salvage integrated female cone eats into the outer wall of the fallen object to make a buckle. When the buckle can withstand a certain lifting tension and torque, lift the drill bit, and the salvage thread is fixedly connected to the salvaged object to catch the fallen object and complete the salvage operation.

[0033] The integrated female cone tool for salvaging has a simple structure, is convenient and quick to use, can complete the milling and salvaging operations in one drilling trip, saves time and reduces risks, is safe and reliable, and is suitable for wide promotion and use.

[0034] As for the device and the method of use disclosed in the embodiment, since they correspond to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0035] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The integrated female cone is used to salvage fish in the well, and its characteristics are: The invention comprises a connecting head (1), a female cone body (2), a sleeve milling cylinder (3) and a sleeve milling head (4) which are coaxially arranged in sequence and all have through holes in the axial direction; the connecting head (1) is detachably connected to an external drilling tool; one end of the female cone body (2) is fixedly connected to one end of the connecting head (1); a fishing thread (5) is provided in the female cone body (2); one end of the sleeve milling cylinder (3) is fixedly connected to the other end of the female cone body (2); and the sleeve milling head (4) is fixedly connected to the other end of the sleeve milling cylinder (3).

2. The integrated female cone according to claim 1, characterized in that: The inner diameter of the salvage thread of the female cone body (2) is gradually increased from one end to the other end, and the end with a smaller inner diameter of the salvage thread is close to the connector (1), while the end with a larger inner diameter of the salvage thread is close to the sleeve milling cylinder (3).

3. The integrated female cone according to claim 1, characterized in that: The salvage thread (5) is 8 threads / 25.4 mm, and the thread taper is 1:

16.

4. The integrated female cone according to claim 3, characterized in that: The thread surface of the salvage thread (5) is carburized and quenched, the carburized layer depth is 0.8 mm, and the surface hardness of the salvage thread (5) is HRC60-65.

5. The integrated female cone according to claim 1, characterized in that: The connecting head (1), the female cone body (2) and the sleeve milling cylinder (3) are integrally fixed and formed.

6. The integrated female cone according to claim 1, characterized in that: The sleeve milling head (4) is in the shape of an annular cutting tooth, is made of hard alloy, and is welded to the other end of the sleeve milling cylinder (3).

7. The integrated female cone according to claim 1, characterized in that: The outer diameter of the sleeve milling cylinder (3) is 6-8 mm smaller than the inner diameter of the well.

8. The integrated female cone according to claim 1, characterized in that: The length of the female cone body (2) is 80-120 mm.

9. The integrated female cone according to claim 1, characterized in that: The through hole of the connector (1) gradually increases from close to the female cone body (2) to the other end.

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