CN214035593U

CN214035593U - Self-protection type back-off fishing spear

Info

Publication number: CN214035593U
Application number: CN202022173279.7U
Authority: CN
Inventors: 于游洋; 刘国振; 桂鹏; 张帅; 胡秉磊; 左凯; 许清海; 王同辉; 熊燃; 刘世岩
Original assignee: CNOOC Energy Technology and Services Ltd
Current assignee: CNOOC Energy Technology and Services Ltd
Priority date: 2020-09-28
Filing date: 2020-09-28
Publication date: 2021-08-24
Anticipated expiration: 2030-09-28

Abstract

The utility model discloses a self-protection type back-off fishing spear, which comprises an upper joint, a connecting sleeve, a spear and a spear tile; the tool can change and maintain the states of salvaging and releasing hands by rotating the drilling tool; in the fish falling process, the tiles are ensured not to be inserted out of the fish top; in the fishing process, the stress condition between the fallen fish and the spear tile can be improved, and tools and the fallen fish are prevented from being damaged; the problem that the lance tile gradually descends relative to the lance rod until the lance cannot be disengaged due to the additional friction force between the lance rod and the lance tile caused by impurities in the well can be solved; and the operation risk is reduced.

Description

Self-protection type back-off fishing spear

Technical Field

The utility model relates to an oil and natural gas development field, concretely relates to lance is dragged for to self preservation protects formula back-off.

Background

With the development of the petroleum industry, many oil fields step into a stable production period, the scale of the well repair industry is continuously enlarged, and the fishing operation amount is further improved. Along with the time continuation, the aging problem of the oil-water well gradually becomes prominent, and the corrosion, scaling, deformation and fragmentation of the oil casing are increased year by year. Some old-fashioned fishing tools are difficult to deal with new conditions, not only influence the fishing of the fallen fish, but also cause the damage of the tools to the well, and form new complex conditions.

In the current fishing operation, the back-off is a very key technology. And as the back-off fishing spear of specialized tool, there are some problems of oneself: firstly, when the fish top with thinner wall thickness is introduced, the tile is easy to be inserted out of the fish top; secondly, in the fishing process, the spear tiles are easy to break and fall into the well; thirdly, when the oil pipe is corroded, the fish is easily extruded and expanded and even broken; fourthly, under the condition that impurities in the well are more, when the long-time activity unfreezing is unsuccessful, the tool is difficult to release the hand. Once the problems occur, the difficulty of fishing is increased, the operation time is reduced, the operation cost is increased, and the recovery period of the oil-water well is prolonged.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art not enough, provide a self preservation protects formula back-off and drags for lance.

The utility model aims at providing an intensity is higher, can stably introduce the fish top, protects the fish head to can avoid the back-off of unable hand risk to drag for lance and supporting lance tile. The tool can change and maintain the states of salvaging and releasing hands by rotating the drilling tool; in the fish falling process, the tiles are ensured not to be inserted out of the fish top; in the fishing process, the stress condition between the fallen fish and the spear tile can be improved, and tools and the fallen fish are prevented from being damaged; the problem that the lance tile gradually descends relative to the lance rod until the lance cannot be disengaged due to the additional friction force between the lance rod and the lance tile caused by impurities in the well can be solved; and the operation risk is reduced.

The utility model discloses a realize through adopting following technical scheme:

a self-protection type back-off fishing spear comprises an upper joint, a connecting sleeve, a spear rod and a spear tile;

the lower end of the upper joint is provided with an opening, and a lug structure is formed at the lower end of the upper joint;

the upper end of the spear is connected and installed with the upper joint through threads, a side circumferential key is formed on the side surface of the rod body, a conical surface is formed at the lower part of the rod body, and a conical surface circumferential key is formed on the conical surface;

the connecting sleeve is arranged at the lower end of the upper joint through a groove structure, an inner key groove on the inner side of the connecting sleeve is matched with a side circumferential key of the lance, and an inner hexagonal positioning screw for fixing is arranged on the side part of the connecting sleeve;

the lance tile is sleeved on the outer side of the conical surface of the lance, the lower conical surface of the lance tile is matched with the conical surface of the lance, and the separation seams among the tiles correspond to the circumferential keys of the conical surface of the lance.

In the technical scheme, the inner diameter of the spear tile is close to the outer diameter of the spear, so that the tile cannot be inserted into a thin fish top.

In above-mentioned technical scheme, when the spear tile grabs the fish, the contained angle between the salvage screw thread face of spear tile and the fish is less than 1, guarantees that spear tile and fish atress are even, and is not fragile.

In the technical scheme, the lance rod and the lance tile are provided with interacting stop steps, the maximum opening size of the lance tile is limited, and the lance tile and fish falling are prevented from being broken.

In the technical scheme, the upper part of the lance tile is provided with the limiting step, the lance tile can move upwards relative to the lance by means of the supporting force of the fish top, and the fishing spear can be prevented from disengaging from the hand.

The utility model discloses an advantage and beneficial effect do:

the utility model discloses a lance is dragged for to self preservation formula back-off, including top connection, spear, adapter sleeve, lance tile and set screw. The upper joint and the lance are connected through threads; the lance rod and the lance tile are matched in conical surface; three grooves at the upper end of the connecting sleeve are matched with three lugs at the lower part of the upper joint, three key grooves in the connecting sleeve are matched with three keys at the upper circumference of the lance, and the connecting sleeve is fixed by an inner hexagonal positioning screw; the spear tile is matched with the key groove on the circumference of the conical surface at the lower part of the spear through three tiles. The tool can prevent the fish head and the spear tile from being damaged, and effectively reduces the secondary risk of fishing operation.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic view of the upper joint structure.

Fig. 3 is a schematic view of the lance structure.

Fig. 4 is a schematic view of the structure of the connecting sleeve.

Fig. 5 is a schematic view of a spear tile structure.

Fig. 6 is a schematic diagram of the working principle.

Wherein, 1 is an upper joint, 2 is a lance, 3 is a connecting sleeve, 4 is a spear tile, and 5 is an inner hexagon positioning screw;

1-1 is a bump;

2-1 is a lower conical surface, 2-2 is a side circumferential key, and 2-3 is a conical surface circumferential key;

3-1 is a groove, and 3-2 is an internal key groove;

4-1 is a lower conical surface of the lance tile, and 4-2 is a tile;

101 is a shaft, 102 is a fish, 103 is a self-protection type reversing fishing spear, and 104 is a conveying drilling tool.

For a person skilled in the art, other relevant figures can be obtained from the above figures without inventive effort.

Detailed Description

In order to make the technical field person understand the solution of the present invention better, the technical solution of the present invention is further described below with reference to the specific embodiments.

Examples

As shown in fig. 1 to 5, a self-protection type back-off fishing spear comprises an upper connector 1, a connecting sleeve 3, a spear 2 and a spear tile 4;

the lower end of the upper joint is provided with an opening, and the lower end of the upper joint is provided with a lug 1-1 structure;

the upper end of the spear is connected and installed with the upper joint through threads, a side circumferential key 2-2 is formed on the side surface of the rod body, a conical surface 2-1 is formed at the lower part of the rod body, and a conical surface circumferential key 2-3 is formed on the conical surface;

the connecting sleeve is arranged at the lower end of the upper joint through a groove 3-1 structure, an inner key groove 3-2 on the inner side of the connecting sleeve is matched with a side circumferential key of the lance, and an inner hexagonal positioning screw 5 for fixing is arranged on the side part of the connecting sleeve;

the lance tile is sleeved on the outer side of the conical surface of the lance, the lower conical surface 4-1 of the lance tile is matched with the conical surface of the lance, and the separation seams among the tiles correspond to the circumferential keys of the conical surface of the lance.

The inside diameter of the spear tile is close to the outside diameter of the spear, so that the tile cannot be inserted into a thin fish top.

When the spear tile catches the fish, the included angle between the fishing thread face of the spear tile and the fish is smaller than 1 degree, the spear tile and the fish are guaranteed to be stressed evenly and are not easy to damage.

The lance and the lance tile are provided with interacting stop steps to limit the maximum opening size of the lance tile and prevent the lance tile and fish from breaking.

The lance tile upper portion is equipped with spacing step, relies on the fish top holding power to make the relative lance of lance tile can shift up, guarantees to drag for the lance and can break away from the hand.

As shown in fig. 6, the self-protection type back-off fishing spear of the present embodiment is lowered along with the fishing string, and the spear shoe 4 is in a free state during the lowering process; the upper joint 1, the spear 2 and the connecting sleeve 3 integrally move downwards, and the connecting sleeve 3 pushes the spear tile 4 to move downwards to enter the top of the fish; the spear tile is kept in a fixed circumferential direction, the upper connector 1 drives the spear 2 to reversely rotate through the connecting sleeve 3, and the spear tile 4 is positioned above the torque key slot of the spear 2. The spear tile 4 is longitudinally kept immovable, the upper joint 1, the spear 2 and the connecting sleeve 3 are integrally moved upwards, the spear tile 4 enters the torque key groove of the spear 2, the spear tile 4 is pushed to be opened through the conical surface of the spear 2, the grabbing action is realized, the spear tile 4 and the spear 2 are matched with a stop step, and the condition that the opened maximum size of the spear tile 4 cannot burst and fall fish is ensured. The top connection 1 drives the lance 2 to rotate reversely through the connecting sleeve 3, and then drives the spear tile 4 through the key of the torque key groove of the lance 2 so as to drive the fish to rotate reversely, so that the reverse buckling is realized. The upper joint 1, the spear 2 and the connecting sleeve 3 integrally move downwards, the spear tile 4 is supported by the fish top to limit the step, and the spear tile 4 is ensured to be longitudinally fixed and separated from the conical surface of the spear to be contracted; after the spear tile 4 leaves the spear torque keyway, the upper joint 1 drives the spear 2 to rotate forwards through the connecting sleeve 3, so that the spear tile 4 is positioned above the key of the torque keyway and cannot enter the spear conical surface, and the purpose of disengaging is achieved.

The tool can change and keep the salvaging and releasing state by rotating the drilling tool; in the fish falling process, the tiles are ensured not to be inserted out of the fish top; in the fishing process, the stress condition between the fallen fish and the spear tile can be improved, and tools and the fallen fish are prevented from being damaged; the problem that the lance tile gradually descends relative to the lance rod until the lance cannot be disengaged due to the additional friction force between the lance rod and the lance tile caused by impurities in the well can be solved; the operation risk is reduced.

The invention has been described above by way of example, and it should be noted that any simple variants, modifications or other equivalent substitutions by a person skilled in the art without spending creative effort may fall within the scope of protection of the present invention without departing from the core of the present invention.

Claims

1. The utility model provides a lance is dragged for to self preservation protection formula back-off which characterized in that: comprises an upper joint, a connecting sleeve, a lance and a spear tile;

2. The self-protecting back-off spear of claim 1, wherein: the inside diameter of the spear tile is close to the outside diameter of the spear, so that the tile cannot be inserted into a thin fish top.

3. The self-protecting back-off spear of claim 1, wherein: when the spear tile catches the fish, the included angle between the fishing thread face of the spear tile and the fish is smaller than 1 degree, the spear tile and the fish are guaranteed to be stressed evenly and are not easy to damage.

4. The self-protecting back-off spear of claim 1, wherein: the lance and the lance tile are provided with interacting stop steps to limit the maximum opening size of the lance tile and prevent the lance tile and fish from breaking.

5. The self-protecting back-off spear of claim 1, wherein: the lance tile upper portion is equipped with spacing step, relies on the fish top holding power to make the relative lance of lance tile can shift up, guarantees to drag for the lance and can break away from the hand.