CN210598893U - Sieve pipe fishing device and sieve pipe fishing system - Google Patents

Abstract

The utility model provides a screen pipe fishing device and a screen pipe fishing system, relating to the technical field of screen pipe fishing, wherein the screen pipe fishing device comprises a flushing pipe, a flow guide component and a fishing piece; the diversion assembly is fixedly sleeved on the outer wall of the flushing pipe and can be in sliding seal with the sieve pipe; the fishing piece is fixedly arranged on the outer wall of the flushing pipe, the fishing piece is positioned above the flow guide assembly, and the fishing piece can be connected with the sieve pipe. The screen fishing system includes a flushing assembly and a screen fishing device. The screen pipe fishing device and the screen pipe fishing system achieve the technical effect of high fishing efficiency.

Description

Sieve pipe fishing device and sieve pipe fishing system

Technical Field

The utility model relates to a screen pipe salvages technical field, particularly, relates to screen pipe fishing device and screen pipe fishing system.

Background

As the oil field is continuously developed and produced, the screen pipe in part of the cased well has sand control failure, so that the production of the oil well is stopped and the injection of the water injection well is stopped. In order to realize the production of the oil well and the normal water injection of the water well again, the secondary sand prevention operation needs to be carried out on the oil well and the water well. Before secondary sand control, the sieve tube in the oil well needs to be fished to the ground. Gravel and stratum sand filled between the screen pipe and the casing in the old well exist, and the gravel and the stratum sand between the screen pipe and the casing are cemented into blocks due to the long time of the screen pipe in the well, so that the screen pipe cannot be directly pulled out.

For conventional screen pipe fishing, a sleeve milling pipe can be adopted for sleeve milling, but the length of each sleeve milling is short, the sleeve milling efficiency is low, and the situation of blocking during sleeve milling exists. For the unconventional large-diameter sieve tube, because the annular space between the sieve tube and the sleeve is small, the sleeve milling operation cannot be carried out by adopting a sleeve milling tube, only the drilling and grinding mode can be adopted for fishing, and the fishing efficiency of the drilling and grinding mode is also very low.

Therefore, it is an important technical problem to be solved by those skilled in the art to provide a screen pipe fishing device and a screen pipe fishing system with high fishing efficiency.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a screen pipe fishing device and screen pipe fishing system to alleviate the technical problem of salvaging inefficiency among the prior art.

In a first aspect, an embodiment of the present invention provides a screen pipe salvaging device, which includes a wash pipe, a flow guiding component and a salvaging part;

the flow guide assembly is fixedly sleeved on the outer wall of the flushing pipe and can be in sliding seal with the sieve pipe;

the fishing part is fixedly arranged on the outer wall of the flushing pipe, the fishing part is positioned above the flow guide assembly, and the fishing part can be connected with the sieve pipe.

With reference to the first aspect, embodiments of the present invention provide a possible implementation manner of the first aspect, wherein the flow guiding assembly includes an elastic sealing element and a restraining element for limiting a position of the elastic sealing element;

one end of the elastic sealing element is fixedly connected with the flushing pipe, and the other end of the elastic sealing element is positioned in the restraint piece and always tends to be abutted against the inner wall of the sieve pipe;

the restraint piece is sleeved on the flushing pipe and connected with the flushing pipe through a first connecting piece, and the first connecting piece can be cut off by liquid pressure so that the restraint piece slides along the flushing pipe.

In combination with the first aspect, an embodiment of the present invention provides a possible implementation manner of the first aspect, wherein the constraint piece includes a constraint section, a first connection section, an annular section, and a second connection section, which are sequentially arranged, the constraint section is used for constraining the elastic sealing element, the annular section and the washpipe form a first annular space, and both the first connection section and the second connection section are in sliding seal with the washpipe; the first connecting piece is arranged at the first connecting section, and the flushing pipe is provided with a liquid injection port communicated with the first annulus;

when the flushing pipe is filled with liquid, the liquid can enter the first annular space from the liquid filling port and push the restraint piece to move towards the direction far away from the elastic sealing piece.

In combination with the first aspect, an embodiment of the present invention provides a possible implementation manner of the first aspect, wherein a limiting block for limiting a position of the constraining member is disposed on the washing pipe.

With reference to the first aspect, an embodiment of the present invention provides a possible implementation manner of the first aspect, wherein the sieve tube salvaging device further includes a sealing assembly, the sealing assembly is sleeved on the flushing tube and connected to the flushing tube through a second connecting member, and the sealing assembly is located above the flow guide assembly;

the sealing assembly is in a round table shape, the maximum outer diameter of the sealing assembly is larger than the inner diameter of the sieve tube, when fishing is carried out, the inner wall of the sealing assembly can be in sliding seal with the flushing pipe, and the outer wall of the sealing assembly can be in fixed seal with the sieve tube.

With reference to the first aspect, an embodiment of the present invention provides a possible implementation manner of the first aspect, wherein the seal assembly includes a base pipe, an outer seal ring, and an inner seal ring;

the base pipe is sleeved on the outer wall of the flushing pipe, and a limiting part for limiting the base pipe is arranged on the outer wall of the flushing pipe;

the inner seal ring is arranged on the inner wall of the base pipe, and the outer seal ring is sleeved on the outer wall of the base pipe.

With reference to the first aspect, embodiments of the present invention provide a possible implementation manner of the first aspect, wherein the sealing assembly further includes a thrust ring;

the thrust ring is sleeved on the outer wall of the base pipe, and the second connecting piece is arranged on the thrust ring.

In combination with the first aspect, an embodiment of the present invention provides a possible implementation manner of the first aspect, wherein a backstop is disposed between the thrust ring and the outer sealing ring, and the backstop is used to implement the backstop of the outer sealing ring.

With reference to the first aspect, an embodiment of the present invention provides a possible implementation manner of the first aspect, wherein the seal assembly further includes an anchor fixedly disposed at a bottom of the base pipe, and the anchor can abut against the limiting member;

the outer wall of the flushing pipe is sleeved with a switch ring for controlling the opening and closing of the anchoring piece, the switch ring is sleeved on the base pipe and connected with the base pipe through a third connecting piece, and a stop block for resetting the switch ring is arranged on the base pipe;

when the fishing tool is used for fishing, the switch ring and the flushing pipe can slide relatively after the third connecting piece is sheared under the action of hydraulic pressure.

In combination with the first aspect, an embodiment of the present invention provides a possible implementation manner of the first aspect, wherein the bottom of the washing pipe is provided with a screw motor, and an output end of the screw motor is connected with a knocking component for knocking an inner wall of the screen pipe.

With reference to the first aspect, embodiments of the present invention provide a possible implementation manner of the first aspect, wherein the knocking assembly includes a power shaft, a gear ring, and a knocking ball;

the power shaft is connected with the output end of the screw motor, the gear ring is fixedly connected with the screw motor, the gear is in eccentric transmission connection with the power shaft, and the gear is meshed with the gear ring;

the knocking ball is eccentrically arranged on the gear through a flexible rod.

With reference to the first aspect, an embodiment of the present invention provides a possible implementation manner of the first aspect, wherein a pressure relief pipe is connected between the flushing pipe and the screw motor;

a pressure relief hole is formed in the pipe body of the pressure relief pipe, and an elastic piece and a piston used for plugging the pressure relief hole are arranged in the pressure relief pipe;

the piston can move downwards along the axial direction of the pressure relief pipe under the action of hydraulic pressure so as to ensure that the pressure relief hole is unblocked;

the piston can move upwards along the axial direction of the pressure relief pipe under the action of the elastic piece so as to block the pressure relief hole.

In a second aspect, an embodiment of the present invention provides a screen pipe fishing system, which includes a flushing assembly and a screen pipe fishing device.

Has the advantages that:

the utility model provides a screen pipe fishing device, which comprises a washing pipe, a flow guide component and a fishing piece; the diversion assembly is fixedly sleeved on the outer wall of the flushing pipe and can be in sliding seal with the sieve pipe; the fishing piece is fixedly arranged on the outer wall of the flushing pipe, the fishing piece is positioned above the flow guide assembly, and the fishing piece can be connected with the sieve pipe.

When the screen pipe is used, the flushing pipe is inserted into the screen pipe to be salvaged, and the flow guide assembly arranged on the outer wall of the flushing pipe can be abutted against the inner wall of the screen pipe to form sealing. And then injecting water into the flushing pipe, wherein water flow is sprayed out from the bottom of the flushing pipe to inject water into the oil well, and after the oil well below the flushing pipe is filled with water, the water flow sprayed out from the flushing pipe can impact upwards along the annular space between the flushing pipe and the sieve pipe. Can be stopped when ascending rivers meet the water conservancy diversion subassembly, rivers can see through the sieve mesh on the screen pipe this moment and enter into the annular space between sleeve pipe and the screen pipe, strike the gravel between sleeve pipe and the screen pipe, make the knot board, closely knit gravel loose to make the gravel that bonds on the screen pipe outer wall drop, reduce or even eliminate the frictional force of gravel to the screen pipe, thereby reduce the resistance of salvaging the screen pipe.

And the wash pipe can continuously go deep into and strike the gravel between sleeve pipe and the screen pipe, after the wash pipe reached the setting position, set up this moment at the wash pipe outer wall and along with the wash pipe deep salvage the piece and be located the screen pipe top, and salvage the piece and can link together with the screen pipe, then the staff can relax propose the screen pipe, accomplish salvage work, need not to carry out the cover through such setting and mill work, very big improvement work efficiency.

The utility model provides a pair of sieve pipe fishing system, including flushing component and sieve pipe fishing device. The screen fishing system has the advantages over the prior art described above and will not be described in detail herein.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic view of a screen pipe fishing apparatus according to an embodiment of the present invention (wherein the fishing component is not shown);

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

FIG. 3 is an enlarged view of a portion of FIG. 1 at B;

FIG. 4 is an enlarged view of a portion of FIG. 1 at C;

FIG. 5 is a schematic view showing the connection between a thrust ring and a base pipe in the screen pipe fishing device according to the embodiment of the present invention;

FIG. 6 is a schematic structural view of a knocking assembly in the screen pipe fishing device according to an embodiment of the present invention;

FIG. 7 is a schematic view of the screen pipe fishing apparatus according to an embodiment of the present invention being run into a well;

FIG. 8 is an enlarged view of a portion of FIG. 7 at D;

fig. 9 is a movement track of the center of the hitting ball in the screen pipe fishing device according to the embodiment of the present invention.

Icon:

100-washing the pipe; 101-a fishing part; 102-liquid injection port; 110-a limiting block; 120-a switching loop; 130-a stop block; 140-a stop;

200-a flow guide assembly; 210-an elastomeric seal; 220-a restraint; 221-a confinement section; 222 — a first connection segment; 223-a ring empty section; 224-a second connecting segment;

300-a seal assembly; 310-a base pipe; 311-a chute; 320-outer sealing ring; 330-inner sealing ring; 340-a thrust ring; 350-a backstop; 360-an anchor;

400-screw motor;

500-a rapping assembly; 510-a power shaft; 520-a gear; 530-gear ring; 540-knock ball; 550-flexible rod;

600-pressure relief pipes; 610-pressure relief holes; 620-a spring; 630-a piston;

700-screen pipe; 800-gravel.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "length", "upper", "lower", "top", "bottom", "inner", "outer", "axial", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and simplification of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "connected" and "fixed" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection, or as an integral part; may be a mechanical connection; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

The present invention will be described in further detail below with reference to specific embodiments and with reference to the attached drawings.

Referring to fig. 1 and 7, the present embodiment provides a screen fishing device, including a washpipe 100, a flow guide assembly 200, and a fishing member 101; the guide assembly 200 is fixedly sleeved on the outer wall of the washing pipe 100, and the guide assembly 200 can be in sliding seal with the sieve pipe 700; the fishing part 101 is fixedly arranged on the outer wall of the washpipe 100, the fishing part 101 is positioned above the flow guide assembly 200, and the fishing part 101 can be connected with the sieve pipe 700.

In use, the washpipe 100 is inserted into the screen 700 to be salvaged, and the deflector assembly 200 disposed on the outer wall of the washpipe 100 abuts against the inner wall of the screen 700 to form a seal. Then, water is injected into the washpipe 100, water is ejected from the bottom of the washpipe 100 to inject water into the oil well, and when the oil well below the washpipe 100 is filled with water, the water ejected from the washpipe 100 strikes upwards along the annular space between the washpipe 100 and the screen pipe 700. When the upward water flow meets the diversion assembly 200, the water flow is blocked, at the moment, the water flow enters an annular space between the sleeve and the screen pipe 700 through the screen holes on the screen pipe 700, the gravel 800 between the sleeve and the screen pipe 700 is impacted, the knotted and compact gravel 800 is loosened, the gravel 800 bonded on the outer wall of the screen pipe 700 falls, the friction force of the gravel 800 on the screen pipe 700 is reduced or even eliminated, and the resistance of fishing the screen pipe 700 is reduced.

And the washpipe 100 can be lastingly gone deep into and assault the gravel 800 between sleeve pipe and screen pipe 700, after washpipe 100 reached the set position, the salvage 101 that sets up at the washpipe 100 outer wall and go deep along with washpipe 100 this moment is located the screen pipe 700 top, and salvage 101 can link together with screen pipe 700, then the staff can be relaxed proposes screen pipe 700, accomplishes salvage work, need not to carry out the milling work through such setting, very big improvement work efficiency.

The diversion assembly 200 can be in sliding seal with the inner wall of the screen 700, so that water flow discharged from the bottom of the washpipe 100 cannot flow upward from between the washpipe 100 and the screen 700 through the diversion assembly 200, and can only be guided by the diversion assembly 200 to be discharged from the side wall of the screen 700 to impact the gravel 800.

The fishing part 101 is fixedly arranged on the outer wall of the washpipe 100, namely, the fishing part 101 can be directly and fixedly connected with the outer wall of the washpipe 100 or can be in threaded connection with the washpipe 100, as long as the working part of the fishing part 101 is positioned outside the washpipe 100.

It should be noted that the fishing part 101 is an overshot, and the bottom of the overshot is provided with an internal thread, and the overshot can be connected with the top of the screen 700 by means of a threaded connection.

Referring to fig. 1 and 4, in an alternative of the present embodiment, the flow guide assembly 200 includes an elastic seal 210 and a restraining member 220 for restraining the position of the elastic seal 210; one end of the elastic sealing element 210 is fixedly connected with the washpipe 100, and the other end is positioned in the restraint element 220 and always tends to be abutted against the inner wall of the sieve pipe 700; the restriction member 220 is sleeved on the washpipe 100 and connected to the washpipe 100 through a first connecting member, and the first connecting member can be cut off by liquid pressure, so that the restriction member 220 slides along the washpipe 100.

Specifically, when the hydraulic pressure shears the first connection member for connecting the restraint member 220 and the wash pipe 100, the restraint member 220 can slide on the wash pipe 100 under the action of the hydraulic pressure, and when the restraint member 220 is displaced, the elastic sealing member 210 restrained by the restraint member 220 can be unfolded, and the elastic sealing member 210 can be abutted against the inner wall of the screen pipe 700, so that water cannot pass through, and the water flows from the screen hole of the screen pipe 700 to the position between the casing and the screen pipe 700, thereby performing impact operation on the gravel 800.

Wherein the elastic sealing member 210 is made of rubber cup or rubber shed, so that the elastic sealing member 210 tends to abut against the inner wall of the screen pipe 700.

It should be noted that the first connection is a shear pin, and when the hydraulic pressure reaches the set pressure, the driving force of the hydraulically driven restriction member 220 can shear the shear pin, so that the restriction member 220 can move relative to the washpipe 100, thereby releasing the restrained resilient seal 210.

Referring to fig. 4, in an alternative of the present embodiment, the restraint member 220 includes a restraint section 221, a first connection section 222, an annular section 223 and a second connection section 224, which are sequentially arranged, the restraint section 221 is used for restraining the elastic sealing member 210, the annular section 223 forms a first annular with the washpipe 100, and the first connection section 222 and the second connection section 224 are both in sliding seal with the washpipe 100; the first connecting piece is arranged at the first connecting section 222, and the washing pipe 100 is provided with a liquid injection port 102 communicated with the first annulus; upon filling the washpipe 100, liquid can enter the first annulus from the filling port 102 and urge the restriction member 220 to move away from the resilient seal member 210.

Specifically, the restriction member 220 is tubular, and the restriction member 220 can form a first annular space with the washpipe 100 through the annular space section 223 thereon, the liquid in the washpipe 100 can flow into the first annular space through the liquid injection port 102, and the liquid can cause the restriction member 220 to have a downward sliding tendency, and when the pressure applied to the restriction member 220 by the liquid is enough to cut off the first connection member, the first connection member can be cut off, and the liquid can drive the restriction member 220 to slide downward, so that the elastic sealing member 210 restrained by the restriction member 220 can be released and unfolded.

Wherein both the first connection section 222 and the second connection section 224 are capable of forming a sliding seal with the washpipe 100, avoiding fluid leakage in the first annulus.

Referring to fig. 1, in an alternative embodiment, the washpipe 100 is provided with a limiting block 110 for limiting the position of the restraining member 220.

Specifically, the position of the restraint member 220 is limited by the limiting block 110, so that the first annular space is prevented from being communicated with the annular space formed by the sleeve and the screen pipe 700, and liquid leakage is avoided.

Referring to fig. 1, in an alternative embodiment, the screen pipe fishing device further includes a sealing assembly 300, the sealing assembly 300 is sleeved on the wash pipe 100 and connected with the wash pipe 100 through a second connecting piece, and the sealing assembly 300 is located above the diversion assembly 200; the seal assembly 300 is in the shape of a truncated cone, and the maximum outer diameter of the seal assembly 300 is greater than the inner diameter of the screen 700.

Specifically, when the seal assembly 300 is inserted into the screen 700 along with the washpipe 100, a part of the seal assembly 300 enters the screen 700, but because the seal assembly 300 is in the shape of a truncated cone, a part of the seal assembly 300 is clamped with the screen 700, and at this time, the washpipe 100 continues to descend, and the descending force of the washpipe 100 shears the second connecting member, so that the seal assembly 300 completes the sealing work.

It should be noted that the second connector employs shear pins.

Referring to fig. 1 and 2, in an alternative version of the present embodiment, a seal assembly 300 includes a base pipe 310, an outer seal ring 320, and an inner seal ring 330; the base pipe 310 is sleeved on the outer wall of the washpipe 100, and the outer wall of the washpipe 100 is provided with a limiting piece 140 for limiting the base pipe 310; the inner sealing ring 330 is disposed on the inner wall of the base pipe 310, and the outer sealing ring 320 is sleeved on the outer wall of the base pipe 310.

Specifically, the outer sealing ring 320 can be in sealing connection with the inner wall of the screen pipe 700, and the inner sealing ring 330 can be in sealing connection with the washpipe 100, so that water flow is prevented from flowing out from between the washpipe 100 and the base pipe 310.

Referring to fig. 1, 3 and 5, in an alternative to the present embodiment, the seal assembly 300 further includes a thrust ring 340; thrust ring 340 is sleeved on the outer wall of base pipe 310, and the second connecting piece is arranged on thrust ring 340.

Specifically, when the sealing assembly 300 is stuck to the inner wall of the screen pipe 700, the washpipe 100 moves downwards to drive the thrust ring 340 to move downwards, so that the thrust ring 340 can push and press the outer sealing ring 320, and the outer sealing ring 320 is tightly abutted to the inner wall of the screen pipe 700.

After the washpipe 100 drives the thrust ring 340 to drive the outer sealing ring 320 to complete the sealing operation, the washpipe 100 does not move any more, then the washpipe 100 performs the washing operation on the gravel 800 at a single position, and then the gravel 800 above the position is washed loose, so that the fishing operation of the sieve pipe 700 with the set length is completed.

The outer wall of the base pipe 310 is provided with a sliding groove 311, and when the thrust ring 340 slides, the thrust member slides along the sliding groove 311.

Referring to fig. 1 and 2, in an alternative of the present embodiment, a backstop 350 is disposed between thrust ring 340 and outer sealing ring 320, and backstop 350 is used to realize backstopping of outer sealing ring 320.

Specifically, the thrust ring 340 pushes the backstop 350 to push the outer sealing ring 320 to complete the sealing work, and the backstop 350 can prevent the outer sealing ring 320 from restoring, so that the outer sealing ring 320 is kept tightly abutted against the inner wall of the screen pipe 700.

After the washpipe 100 drives the thrust ring 340 to press the outer sealing ring 320 to expand, the washpipe 100 will continue to move downwards, the thrust ring 340 is blocked by the outer sealing ring 320 and cannot move downwards continuously, the washpipe 100 will shear the second connecting piece, and the outer sealing ring 320 can be prevented from being reset through the arrangement of the non-return piece 350.

It should be noted that, after the thrust ring 340 presses the outer sealing ring 320 to complete the sealing operation, the flushing pipe 100 can move downward, so as to flush the sieve pipe 700 with a longer distance, so that the sieve pipe 700 with a longer length can be salvaged by one operation, and the working efficiency is improved.

Wherein, the backstop 350 is C-shaped and has a certain elasticity, the inner wall of the backstop 350 is provided with first latches, the outer wall of the base tube 310 is provided with second latches corresponding to the first latches, when the thrust ring 340 drives the backstop 350 to move down, the first latches can move down, when the thrust ring 340 is unpowered, the outer sealing ring 320 releases elastic potential energy to drive the backstop 350 to move up, the second latches of the base tube 310 can block the first latches of the backstop 350, so that the backstop 350 cannot move up.

Referring to fig. 1 and 3, in an alternative version of the present embodiment, the seal assembly 300 further comprises an anchor 360 fixedly disposed at the bottom of the base pipe 310, the anchor 360 being capable of abutting against the stop member 140; the outer wall of the flushing pipe 100 is sleeved with a switch ring 120 for controlling the opening and closing of the anchoring piece 360, the switch ring 120 is sleeved on the base pipe 310 and connected with the base pipe 310 through a third connecting piece, and a stop block 130 for resetting the switch ring 120 is arranged on the base pipe 310; in the fishing operation, the switch ring 120 and the washpipe 100 can slide relative to each other after the third connecting member is sheared by hydraulic pressure.

Specifically, the anchor 360 disposed at the bottom of the base pipe 310 enters the screen pipe 700 at the first time, and the anchor 360 contacts the inner wall of the screen pipe 700, and as the anchor 360 goes deep, the anchor 360 forms a large friction force with the inner wall of the screen pipe 700, and the friction force is greater than the shear stress of the second connector, so that when the washpipe 100 needs to wash a longer screen pipe 700, the washpipe 100 can cut the second connector to go deep, and the washpipe 100 goes down with the switch ring 120, at this time, the switch ring 120 will abut against the anchor 360, and as the washpipe 100 drives the switch ring 120 to go down continuously, the friction force between the switch ring 120 and the anchor 360 will increase (the switch ring 120 will spread the anchor 360, so that the anchor 360 abuts against the inner wall of the screen pipe 700), and when the friction force between the switch ring 120 and the anchor 360 is greater than the shear stress of the third connector, the third connection is sheared and the switch ring 120 continues to hold open the anchor 360 to anchor the seal assembly 300.

When the washpipe 100 finishes the flushing work and the worker cannot lift the screen pipe 700 out, the worker lifts the washpipe 100, in the process of lifting the washpipe 100, the stopper 130 on the washpipe 100 drives the switch ring 120 to move upwards, so that the switch ring 120 is separated from the anchor 360, the friction force between the anchor 360 and the inner wall of the screen pipe 700 is reduced, then the washpipe 100 is lifted continuously, the limiting part 140 on the washpipe 100 is abutted to the anchor 360, so that the anchor 360 is driven to move upwards, the sealing assembly 300 can be lifted out of the screen pipe 700, then the worker continues to lift the washpipe 100, and the washpipe 100 is lifted out of an oil well.

Referring to fig. 6 and 7, in an alternative embodiment, a screw motor 400 is provided at the bottom of the washpipe 100, and a striking assembly 500 for striking the inner wall of the screen pipe 700 is connected to the output end of the screw motor 400.

Specifically, the screen pipe 700 is knocked by the knocking assembly 500 driven by the screw motor 400, so that the gravel 800 on the outer wall of the screen pipe 700 becomes loose and the gravel 800 adhered to the outer wall of the screen pipe 700 can be separated.

Referring to FIGS. 6 and 7, in an alternative version of this embodiment, striking assembly 500 includes a power shaft 510, a gear 520, a gear ring 530, and a striking ball 540; the power shaft 510 is connected with the output end of the screw motor 400, the gear ring 530 is fixedly connected with the screw motor 400, the gear 520 is in eccentric transmission connection with the power shaft 510, and the gear 520 is meshed with the gear ring 530; the rattle ball 540 is eccentrically disposed on the gear 520 by a flexible shaft 550.

Specifically, when water impacts the screw motor 400 to make the screw motor 400 start to work, the screw motor 400 can drive the power shaft 510 to rotate, the power shaft 510 can drive the gear 520 to rotate, so that the gear 520 can be meshed with the gear ring 530 to rotate, the rotation center of the gear 520 is different from that of the power shaft 510, the gear 520 can drive the knocking ball 540 to rotate through the flexible rod 550, the rotation center of the flexible rod 550 is different from that of the gear 520, and therefore when the knocking ball 540 rotates around the power shaft 510, the knocking ball 540 can be realized: the movement process of approaching the inner wall of the screen pipe 700, colliding with the inner wall of the screen pipe 700, being far away from the inner wall of the screen pipe 700 and approaching the inner wall of the screen pipe 700, enables the knocking balls 540 to knock the screen pipe 700, and enables the gravel 800 outside the screen pipe 700 to be loosened, thereby reducing the friction force of the gravel 800 acting on the outer wall of the screen pipe 700, and enabling the worker to fish the screen pipe 700 out more quickly.

It should be noted that the flexible rod 550 may be made of a rod material with good elasticity, or may be a coil spring.

When the hitting ball 540 travels, the center travel path of the hitting ball 540 is shown in fig. 9, and when the hitting ball 540 travels to the outermost side, the hitting ball 540 can collide with the inner wall of the screen 700, thereby completing the hitting work on the screen 700.

Referring to fig. 7 and 8, in an alternative of the present embodiment, a pressure relief pipe 600 is connected between the wash pipe 100 and the screw motor 400; a pressure relief hole 610 is formed in the body of the pressure relief pipe 600, and an elastic part 620 and a piston 630 for blocking the pressure relief hole 610 are arranged in the pressure relief pipe 600; the piston 630 can move downwards along the axial direction of the pressure relief pipe 600 under the action of hydraulic pressure, so that the pressure relief hole 610 is unblocked; the piston 630 can move upward along the axial direction of the pressure relief pipe 600 under the action of the elastic member 620 to block the pressure relief hole 610.

In which the damage to the screw motor 400 caused by the excessive water flow pressure in the flushing pipe 100 can be reduced or even eliminated by the arrangement of the pressure relief pipe 600.

Specifically, when the hydraulic pressure in the washpipe 100 is greater than the elastic force of the elastic member 620, the liquid will press the elastic member 620 to contract, so that the piston 630 moves downward, and then the pressure relief hole 610 on the pressure relief pipe 600 is exposed, and the liquid in the washpipe 100 will flow out from the pressure relief hole 610 to reduce the pressure of the liquid in the washpipe 100. When the pressure of the fluid in the washpipe 100 is reduced, the elastic member 620 drives the piston 630 to move upwards, so that the piston 630 blocks the pressure relief hole 610.

The present embodiments provide a screen fishing system including a flushing assembly and a screen fishing device. The screen fishing system has the advantages over the prior art described above and will not be described in detail herein.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present invention.

Claims (10)

1. A screen fishing apparatus, comprising: the device comprises a washing pipe (100), a flow guide assembly (200) and a fishing piece (101);

the flow guide assembly (200) is fixedly sleeved on the outer wall of the flushing pipe (100), and the flow guide assembly (200) can be in sliding seal with the sieve pipe (700);

the fishing piece (101) is fixedly arranged on the outer wall of the flushing pipe (100), the fishing piece (101) is located above the flow guide assembly (200), and the fishing piece (101) can be connected with the sieve pipe (700).

2. The screen fishing device of claim 1, wherein the flow guide assembly (200) comprises an elastomeric seal (210) and a restraint (220) for limiting the position of the elastomeric seal (210);

one end of the elastic sealing element (210) is fixedly connected with the flushing pipe (100), the other end of the elastic sealing element is positioned in the restraint piece (220), and the elastic sealing element always has the tendency of abutting against the inner wall of the sieve pipe (700);

the restraint piece (220) is sleeved on the flushing pipe (100) and is connected with the flushing pipe (100) through a first connecting piece, and the first connecting piece can be sheared by liquid pressure so that the restraint piece (220) slides along the flushing pipe (100).

3. The screen fishing device according to claim 2, wherein the restraint (220) comprises a restraint section (221), a first connection section (222), an annular section (223) and a second connection section (224) which are arranged in sequence, the restraint section (221) is used for restraining the elastic sealing element (210), the annular section (223) forms a first annular space with the wash pipe (100), and the first connection section (222) and the second connection section (224) are both in sliding sealing with the wash pipe (100);

the first connecting piece is arranged on the first connecting section (222), and the flushing pipe (100) is provided with a liquid injection port (102) communicated with the first annular space;

when the flushing pipe (100) is filled with liquid, the liquid can enter the first annular space from the liquid filling port (102) and push the restraining piece (220) to move towards the direction away from the elastic sealing piece (210).

4. The screen fishing device according to claim 3, wherein the wash pipe (100) is provided with a stopper (110) for limiting the position of the restraint (220).

5. The screen fishing device of claim 1, further comprising a sealing assembly (300), wherein the sealing assembly (300) is sleeved on the wash pipe (100) and connected with the wash pipe (100) through a second connecting piece, and the sealing assembly (300) is positioned above the diversion assembly (200);

the sealing assembly (300) is in a circular truncated cone shape, the maximum outer diameter of the sealing assembly (300) is larger than the inner diameter of the sieve tube (700), when fishing is carried out, the inner wall of the sealing assembly (300) can be in sliding seal with the flushing tube (100), and the outer wall of the sealing assembly can be in fixed seal with the sieve tube (700).

6. The screen fishing device of claim 5, wherein the seal assembly (300) includes a base pipe (310), an outer seal ring (320), and an inner seal ring (330);

the base pipe (310) is sleeved on the outer wall of the washpipe (100), and a limiting piece used for limiting the base pipe (310) is arranged on the outer wall of the washpipe (100);

the inner sealing ring (330) is arranged on the inner wall of the base pipe (310), and the outer sealing ring (320) is sleeved on the outer wall of the base pipe (310).

7. The screen fishing device of claim 6, wherein the seal assembly (300) further comprises a thrust ring (340);

the thrust ring (340) is sleeved on the outer wall of the base pipe (310), and the second connecting piece is arranged on the thrust ring (340).

8. The screen fishing device according to claim 6, wherein the seal assembly (300) further comprises an anchor (360) fixedly disposed at the bottom of the base pipe (310), the anchor (360) being adapted to abut against the retainer (140);

the outer wall of the flushing pipe (100) is sleeved with a switch ring (120) used for controlling the anchoring piece (360) to be opened and closed, the switch ring (120) is sleeved on the base pipe (310) and connected with the base pipe (310) through a third connecting piece, and a stop block (130) used for enabling the switch ring (120) to reset is arranged on the base pipe (310);

during fishing, after the third connecting piece is sheared under the action of hydraulic pressure, the switch ring (120) and the wash pipe (100) can slide relatively.

9. The screen fishing device according to any one of claims 1 to 8, wherein a screw motor (400) is provided at the bottom of the wash pipe (100), and a knocking assembly (500) for knocking the inner wall of the screen (700) is connected to the output end of the screw motor (400);

the knocking assembly (500) comprises a power shaft (510), a gear (520), a gear ring (530) and a knocking ball (540);

the power shaft (510) is connected with the output end of the screw motor (400), the gear ring (530) is fixedly connected with the screw motor (400), the gear (520) is in eccentric transmission connection with the power shaft (510), and the gear (520) is meshed with the gear ring (530);

the knocking ball (540) is eccentrically arranged on the gear (520) through a flexible rod (550).

10. A screen fishing system comprising a flushing assembly and a screen fishing apparatus as claimed in any of claims 1 to 9.

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