CN115538968A - A Vibrating Internal Thread Fishing Tool - Google Patents

Abstract

The invention discloses a jarring type internal thread fishing tool which comprises a throttler, a fishing main body, a plurality of connecting buckles, a clamping block and an impact stop block, wherein the connecting buckles are connected with the main body; the upper end of the throttler is provided with a mounting hole, and an internal thread buckle is arranged on the mounting hole; a cavity is arranged in the salvaging main body, a plurality of flow guide ports are arranged on the lower side wall of the salvaging main body in a surrounding manner and are separated to form a claw structure; the connecting buckles are arranged on the claw structure and are circumferentially provided with mounting openings, one end of each connecting buckle is provided with an arc convex buckle, and the side wall of each connecting buckle is provided with an external thread buckle; the cross section of the clamping block is I-shaped, the clamping block is slidably clamped in the mounting opening, the bottom of a protruding part at the upper end of the clamping block is provided with an annular clamping groove, and the plurality of arc-shaped convex buckles are clamped in the annular clamping groove; the striking dog is fixed in the installing port. The fishing main body adopts a hollow structure with a cavity arranged inside, so that the descending speed is not slowed down when the fishing main body contacts the liquid level, and the external thread buckle can rapidly enter the mounting hole of the downhole choke holder to be occluded.

Description

A Vibrating Internal Thread Fishing Tool

technical field

The invention relates to the technical field of downhole operation tools, in particular to a jarring type internal thread fishing tool.

Background technique

With the continuous development of gas fields, the limited success rate of choke fishing has become an important factor restricting the production capacity of gas wells. Especially when the gas well enters the low production stage, the wellbore fluid accumulation gradually increases, which adds a greater burden to choke fishing. Difficulties seriously affect the production of gas wells, and an effective fishing plan is urgently needed.

At present, it can be seen from the cases of choke fishing failure that because the service time of the choke in the wellbore exceeds the design period, the metal surface of the choke will undergo corrosion, hydrogen embrittlement and other chemical phenomena in the downhole environment. During operation, the weak position of the fishing neck of the choke is broken, or the threaded connection is tripped, resulting in the failure of the salvage operation, and the choke after structural damage is more difficult to salvage.

Aiming at the situation that the threads of the choke are tripped after fishing fails, the current common method is to use the fishing tool in the form of an undercut to probe into the tripping position. The conventional fishing tool is a solid tool. When the fishing tool is lowered to the liquid It will be affected by obvious buoyancy when it is on the surface, which will slow down the lowering speed of the fishing tool, and cannot be well connected with the tripping point of the downhole choke, which will affect the fishing effect. Therefore, in the case of fluid accumulation in the wellbore, the The applicability of this salvage process is limited, and the undercut method is difficult to play a role.

Contents of the invention

The object of the present invention is to provide a vibrating internal thread fishing tool to solve the above-mentioned problems in the background technology.

The technical solution of the present invention is: comprising a flow restrictor, a salvage main body, a plurality of connection buckles, a block and an impact block; The main body is arranged above the restrictor, and the interior of the salvage main body is provided with a cavity, and the lower side wall of the salvage main body is surrounded by a plurality of diversion openings, and the lower end of the salvage main body is separated by a plurality of diversion ports to form claws Structure; a plurality of connection buckles are correspondingly arranged on the claw structure at the lower end of the salvage body, and a mounting opening is formed around a plurality of connection buckles, and one end of each connection buckle located in the cavity is provided with an arc-shaped convex buckle , each connecting buckle is located on the side wall of one end outside the cavity, and an external thread buckle matching the internal thread buckle is provided; the cross section of the clamping block is I-shaped, and the middle part of the clamping block is slidingly clamped on the described In the installation port and can move vertically in the installation port, the bottom of the upper protrusion of the clamping block is provided with an annular clamping groove, and the plurality of arc-shaped convex buckles are all clamped in the circular clamping groove, and the lower end of the clamping block is provided with a convex clamping groove. The starting part; the impact block is fixed in the installation opening.

Preferably, the guide port is strip-shaped and longitudinally arranged along the side wall of the fishing body.

Preferably, the connecting buckle is integrally formed with the lower end of the fishing main body.

Preferably, the distance between the top of the protrusion provided at the lower end of the block and the lower end of the connecting buckle is greater than the height of the ring-shaped buckle.

Preferably, the fishing body is made of elastic steel.

Preferably, the upper end of the fishing body is connected with a wire rope.

Compared with prior art, the beneficial effect of the present invention is:

1. The salvage body of the present invention adopts a hollow structure with a cavity inside. Compared with the conventional upside-down fishing tool, when it touches the liquid surface, the speed of lowering the salvage body of the present invention will not slow down significantly. Moreover, the plurality of drainage openings can reduce the contact surface, and the resistance received is small, which is beneficial for the external thread buckle to quickly enter into the installation hole of the downhole choke to be salvaged for engagement.

2. Through the cooperation between the multiple connecting buckles, arc-shaped convex buckles, clamping blocks, annular clamping grooves and impact blocks provided in the present invention, when the restrictor is not in contact, the multiple connecting clamps are connected by the clamping blocks. The buckles are gathered together so that they can be easily inserted into the restrictor. When the raised portion of the lower end of the clamping block collides with the impact block, the clamping block will expand the multiple connecting buckles, and the external buckle provided on the connecting buckle will be used to The threaded buckle fits with the internal threaded buckle provided on the mounting hole of the restrictor, so that the restrictor is salvaged.

Description of drawings

Fig. 1 is the front view sectional structure schematic diagram of the present invention;

Fig. 2 is a schematic diagram of a partially enlarged structure at A in Fig. 1 of the present invention;

Fig. 3 is a schematic diagram of the front view structure of the salvage body of the present invention;

FIG. 4 is a schematic top view of a plurality of connecting buckles of the present invention.

detailed description

The specific implementation manner of the present invention will be described in detail below in conjunction with accompanying drawings 1 to 4 . In describing the invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", " The orientations or positional relationships indicated by "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the It should not be construed as limiting the invention that a device or element must have a particular orientation, be constructed, and operate in a particular orientation.

The terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of these features; in the description of the invention, unless otherwise specified, the meaning of "plurality" means one or more.

Example 1

As shown in FIGS. 1 to 4 , an embodiment of the present invention provides a jarring type internal thread fishing tool, including a restrictor 10 , a fishing body 1 , a plurality of connecting buckles 4 , a clamping block 5 and an impact stopper 9 ; The upper end of the restrictor 10 is provided with an installation port 11, and the inner wall of the installation port 11 is provided with an internal thread buckle 7; the salvage main body 1 is arranged above the restrictor 10, and the interior of the salvage main body 1 is provided with a cavity 3, and the salvage main body The lower side wall of 1 is surrounded by a plurality of diversion openings 2, which can reduce the contact area between the salvage body 1 and the liquid surface, reduce the contact surface, reduce the resistance it receives, and salvage the lower end of the body 1. A claw structure is formed by separating a plurality of diversion openings 2; a plurality of connection buckles 4 are correspondingly arranged on the claw structure at the lower end of the salvage body 1, and a plurality of connection buckles 4 are surrounded by an installation port, and each connection buckle 4 One end located in the cavity 3 is provided with an arc-shaped convex buckle 41, and each connecting buckle 4 is provided with an external threaded buckle 6 on the side wall of one end outside the cavity 3; the cross section of the clamping block 5 is I-shaped, The middle part of the clamping block 5 is slidingly clamped in the installation opening and can move vertically in the installation opening. The bottom of the upper end protrusion of the clamping block 5 is provided with a ring-shaped groove 51, and a plurality of arc-shaped convex buckles 41 are all clamped in the ring clamp. In the slot 51 , the lower end of the clamping block 5 is provided with a raised portion 8 ; the impact block 9 is fixed in the installation opening 11 .

The working principle of the present invention is as follows:

Lowering of the fishing tool: the fishing tool is lowered into the oil pipe of the gas well by steel wire operation. The overall weight of the fishing tool is 1.45kg, the transverse elastic potential energy of the connecting buckle 4 is 163N, and the annular locking groove 51 set on the locking block 5 is connected with the connecting buckle 4 The relative contact length of the arc-shaped convex buckle 41 provided on the top is 20mm. When the raised part 8 provided at the lower end of the clamping block 5 receives an upward impact force of 200N from the impact block 9, the clamping block 5 will be disconnected from the connecting buckle 4 so that the tool In a state of expanded salvage.

Fishing tool bite: the external thread buckle 6 connected to the lower end of the buckle 4 is 50mm in total. When the fishing tool is triggered to expand, the external thread buckle 6 connected to the lower end of the buckle 4 will quickly contact with the fished underground under the action of the expansion of the tail end of the tool. The internal thread buckle 7 of the restrictor is fitted, and under the action of the steel wire lifting, the engaged thread buckle can bear the lifting force of 1200N-1500N of the steel wire operation.

Fishing tool recovery: After the tool is pulled out from the tubing, use a steel wire or other occlusal tool to tighten the tail end of the connecting buckle 4 inwardly to 163N or more, so that the downhole choke is released from the fishing tool.

Further, as shown in FIG. 3 , in order to reduce the contact resistance with the liquid and facilitate the discharge of the added liquid, the guide port 2 is strip-shaped and arranged longitudinally along the side wall of the fishing body 1 .

Further, in order to facilitate processing and installation, the connecting buckle 4 is integrally formed with the lower end of the fishing main body 1 .

Furthermore, in order to make the clip 5 completely disengage from the connection buckle 4 after the bump 8 provided at the lower end of the clip 5 collides with the bump block 9, the bottom bump 8 of the clip 5 The distance from the top to the lower end of the connecting buckle 4 is greater than the height of the annular convex buckle 51.

Further, in order to be able to be used repeatedly, the material of the salvage body 1 is selected as elastic steel.

The above disclosures are only some preferred specific embodiments of the present invention, however, the embodiments of the present invention are not limited thereto, and any changes conceivable by those skilled in the art shall fall within the protection scope of the present invention.

Claims (6)

1. A jarring type internal thread fishing tool, comprising a throttle (10), the upper end of the throttle (10) is provided with a mounting port (11), and the inner wall of the mounting port (11) is provided with an internal thread buckle ( 7), is characterized in that, also includes: The salvage main body (1) is arranged above the restrictor (10), the interior of the salvage main body (1) is provided with a cavity (3), and the lower side wall of the salvage main body (1) is surrounded by a plurality of guiding guides. The orifice (2), the lower end of the salvage body (1) is separated by a plurality of diversion ports (2) to form a claw structure; A plurality of connection buckles (4) are correspondingly arranged on the claw structure at the lower end of the fishing main body (1), and a mounting opening is formed around the plurality of connection buckles (4), and each connection buckle (4) is located at One end in the cavity (3) is provided with an arc-shaped convex buckle (41), and each connecting buckle (4) is located on the side wall of one end outside the cavity (3) and is provided with a button corresponding to the internal thread buckle (7). Matching external thread buckle (6); Block (5), the cross section of which is I-shaped, the middle part of block (5) is slidingly clamped in the installation opening and can move vertically in the installation opening, the bottom of the upper end protrusion of block (5) An annular locking groove (51) is provided, and the plurality of arc-shaped convex buttons (41) are all clamped in the annular locking groove (51), and the lower end of the locking block (5) is provided with a raised portion (8); The impact block (9) is fixed in the installation port (11). 2 . The jarring type internal thread fishing tool according to claim 1 , characterized in that, the diversion opening ( 2 ) is in the shape of a strip and is arranged longitudinally along the side wall of the fishing main body ( 1 ). 3 . 3 . The jarring type internal thread fishing tool according to claim 1 , characterized in that, the connecting buckle ( 4 ) is integrally formed with the lower end of the fishing main body ( 1 ). 4 . 4. A jarring type internal thread fishing tool according to claim 1, characterized in that, the top of the raised part (8) provided at the lower end of the block (5) is connected to the lower end of the buckle (4). The distance between them is greater than the height of the annular convex button (51). 5. A jarring type internal thread fishing tool according to claim 1, characterized in that the material of the fishing main body (1) is elastic steel. 6. A jarring type internal thread fishing tool according to claim 1, characterized in that the upper end of the fishing main body (1) is connected with a wire rope.

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