CN212614609U

CN212614609U - Two-stage steel ball fisher

Info

Publication number: CN212614609U
Application number: CN202020171306.4U
Authority: CN
Inventors: 石庆平; 魏春秉; 马星; 陈金宏; 王晓强; 沙玉琢
Original assignee: Mudanjiang Tianqing Technology Co ltd
Current assignee: Mudanjiang Tianqing Technology Co ltd
Priority date: 2020-02-15
Filing date: 2020-02-15
Publication date: 2021-02-26
Anticipated expiration: 2030-02-15

Abstract

A two-stage steel ball fisher adopts a two-stage steel ball structure with 2 steel ball groups, and an upper joint, a first-stage fishing main body, a connecting sleeve, a second-stage fishing main body and a guide shoe are sequentially connected to form a fishing cylinder body; an annular separation blade is embedded between the primary salvaging main body and the connecting sleeve, 2-4 primary straight holes are formed in the primary salvaging main body, a primary steel ball is placed in each hole, 2-4 secondary straight holes are formed in the secondary salvaging main body, a secondary steel ball is placed in each hole, the lower end of the connecting sleeve is provided with a right-handed thread and a left-handed thread respectively, and a limit stop is arranged on the side wall of the connecting sleeve; be applied to salvaging of fish that falls in the pit, can realize improving clamp force and clamping stability to "doublestage" joint of fish that falls, the change in inner chamber aperture still can make the fisher be applicable to salvaging of different diameters fish that fall in the pit simultaneously, increase application scope improves the commonality, and further, the structural design of flexible cover positive-negative thread and limit stop can also conveniently salvage the dismantlement separation of fish, improves salvage efficiency.

Description

Two-stage steel ball fisher

Technical Field

The utility model relates to a steel ball fisher, in particular to doublestage steel ball fisher.

Background

The three-ball fisher is a special fishing tool for oil field logging headstall, sucker rod hooping and other inter-platform fish, the steel balls in the fisher reset through the falling under the action of the dead weight or the elastic force of a spring, and the steel balls are hooped on the circumferential side wall of the fish when the fisher is lifted, so that the underground fish is fished to the ground. The three-ball fisher in the prior art only comprises one steel ball group, wherein the steel ball group usually comprises 3 steel balls, and when fishing is carried out, the steel ball groups are distributed on the same circumference of a fallen fish in a well in a surrounding manner by hoops, so that the problem of insufficient clamping force on the fallen fish exists due to fewer stress points, the problem of large shaking amplitude of the fallen fish is caused due to smaller stability, and particularly, when the fallen fish is blocked or blocked in the lifting process, the phenomenon of falling off from the three-ball fisher is easily caused, so that fishing accidents are caused, and fishing failure is caused; meanwhile, the inner holes of the three-ball fisher in the prior art are all single fixed inner diameters and are steel balls with fixed diameters, so that the three-ball fisher of each type can only be suitable for fishing underground fish with corresponding diameter size ranges, the three-ball fisher of different types is required to be replaced for underground fish with different size ranges, fishing efficiency is obviously influenced, and the problem of poor product universality exists. Therefore, it is necessary to improve the three-ball fisher in the prior art, research and develop a multi-stage steel ball fisher with a plurality of steel ball groups, improve the stability of clamping and connecting the fallen fish and the universality of fishing the fallen fish, and further improve the fishing effect and the fishing efficiency.

Disclosure of Invention

The utility model aims at providing a doublestage steel ball fisher improves the steadiness of joint fish, salvages the commonality of fish and to the salvage effect and the salvage efficiency of the fish that falls in the pit.

A dual-stage steel ball fisher, comprising: top connection, one-level salvage main part, second grade salvage main part, adapter sleeve and guide shoe.

The top connection with both ends all have the internal thread about the adapter sleeve, the one-level salvage main part with both ends all have the external screw thread about the main part is salvaged to the second grade, the guide shoe upper end has the internal thread, from last to down, the top connection the one-level salvage main part the adapter sleeve the main part is salvaged to the second grade with the guide shoe threaded connection forms in proper order and salvages the barrel, wherein: the diameter phi of the inner cavity of the primary salvaging main body₁Are respectively smaller than the diameter phi of the inner cavity of the connecting sleeve₂And the diameter phi of the inner cavity of the secondary fishing main body₃The inner hole diameter and the diameter phi of the inner cavity of the first-stage salvaging main body are embedded at the connecting end of the first-stage salvaging main body and the connecting sleeve₁The same annular separation blade, set up 2-4 first-class straight holes communicating with cavity each other on the shoulder of upper portion of said first-class salvaging the main body separately, each place a diameter and said first-class straight hole aperture corresponding first-class steel ball and support the first-class reset spring of the said first-class steel ball in the said first-class straight hole, the said first-class steel ball is supported on the said annular separation blade connected to bottom of said first-class straight hole, is restrained by the said first-class straight hole and is always held in the said first-class straight hole, meanwhile, set up 2-4 second-class straight holes communicating with cavity each on the shoulder of upper portion of said second-class salvaging the main body, each place a diameter and said second-class steel ball corresponding to aperture of said second-class straight hole and support the second-class reset spring of the said second-class steel ball in each said second-class straight hole, the said second-class steel, and the steel ball is always contained in the secondary straight hole under the constraint of the secondary straight hole, and the aperture of the primary straight hole is preferably smaller than or equal to that of the secondary straight hole, namely the diameter of the primary steel ball is smaller than or equal to that of the secondary steel ball.

When the two-stage steel ball fisher is applied to fishing the fallen fishes in the well, the one-stage fishing main body can be independently used for fishing the fallen fishes in the well with smaller diameter, and the two-stage fishing main body can be independently used for fishing the fallen fishes in the well with larger diameter, so that the application range of the two-stage steel ball fisher is enlarged; meanwhile, the first-stage fishing main body and the second-stage fishing main body can be simultaneously utilized to salvage the underground fish with the changed diameter, the clamping force of the underground fish is increased through clamping and grabbing the underground fish on different circumferential lines by the double-steel-ball group, the clamping stability is enhanced, and the fishing effect and the fishing efficiency are improved.

Further, it is preferred the internal thread of adapter sleeve upper end is the thread-up internal thread, the internal thread of adapter sleeve lower extreme is the back-off internal thread to in the back of going out the well rotatory during the adapter sleeve, can make one-level salvage the main part with the second grade salvage the main part simultaneously respectively towards the pine take off the one-level steel ball with the direction of second grade steel ball is relative the adapter sleeve produces the motion or produces the motion trend, in order to avoid the one-level steel ball with the second grade steel ball continues to cramp, gives to salvage the well the dismantlement separation of fish that falls in the pit causes the difficulty.

Still further, a limit stop is arranged on the side wall of the connecting sleeve, so that a local reducing area is generated in the inner cavity of the connecting sleeve, and the diameter phi of the inner cavity of the reducing area₄The diameter of the inner cavity of the primary fishing main body is more than or equal to phi₁Is less than or equal to the diameter phi of the inner cavity of the secondary fishing main body₃Preferably, the limit stop blocks are symmetrically arranged in 2 blocks along the circumference of the same section of the connecting sleeve; the limit stop is arranged for properly limiting the degree of the underground fish entering the first-stage fishing main body in the fishing process, and when the underground fish is disassembled on the well, a certain upward displacement space is reserved in the first-stage fishing main body for the underground fish, after the two limit stops are disassembled, the underground fish can be stressed relatively to the first-stage fishing main body to move upwards, so that the first-stage steel ball is loosened, and the underground fish and the two-stage steel ball fisher are separated from each other.

The utility model has the advantages that: the two-stage steel ball fisher is provided, adopts a two-stage steel ball structure with 2 steel ball groups, can realize two-stage clamping on the underground fish, improves the clamping force and the clamping stability of the fish, and can be respectively applied to the fishing of the underground fish with different diameter ranges by utilizing the change of the internal control aperture of the fisher, thereby enlarging the application range and improving the universality; furthermore, still through the structural design of flexible cover positive and negative knot and limit stop, made things convenient for the dismantlement separation of salvaging the fish, when improving the effect of salvaging the fish in the pit and salvaging stability, also can improve salvage efficiency.

Drawings

Fig. 1 is a schematic cross-sectional structure diagram of a two-stage three-ball fisher.

Fig. 2, a partial side view of the connection sleeve.

Detailed Description

The claimed technical solution of the present invention is further described below with reference to the following specific embodiments and the accompanying drawings.

A two-stage three-ball overshot, as shown in fig. 1 and 2, comprising: the fishing device comprises an upper connector 1, a primary fishing main body 2, a secondary fishing main body 3, a connecting sleeve 4 and a guide shoe 5.

From last to lower, top connection 1 the one-level salvage main part 2 the adapter sleeve 4 the second grade salvage main part 3 with guide shoe 5 threaded connection forms salvage barrel in proper order, wherein: the diameter phi of the inner cavity of the primary salvaging main body 2₁Is 62 mm, the diameter phi of the inner cavity of the connecting sleeve 4₂And the diameter phi of the inner cavity of the secondary fishing main body 3₃Is 70 millimeters one-level salvage main part 2 with annular separation blade 6 has been inlayed to the connection end department of adapter sleeve 4 one-level salvage main part 2 is last to have seted up 3 one-level straight holes 11, one-level straight hole 11 is followed 2 circumference sections evenly distributed of one-level salvage main part every one-level straight hole 11 in respectively place a diameter for 16 millimeters one-level steel ball 12 with install in be provided with one-level reset spring between the one-level jackscrew on the 11 ports of one-level straight hole 3 has been seted up 3 second grade straight holes 13 on the second grade salvage main part 3, second grade straight hole 13 is followed 3 circumference sections evenly distributed of second grade salvage main part, every one diameter is respectively placed in the second grade straight hole 13For 20 millimeters second grade steel ball 14 with install in be provided with the second grade reset spring between the second grade jackscrew on the second grade straight hole 13 port the internal thread of adapter sleeve 4 upper end is the thread-up internal thread, and the internal thread of lower extreme is the thread-back internal thread, is provided with limit stop 7 on the lateral wall, limit stop 7 follows the symmetry sets up 2 on the same section circumference of adapter sleeve 4, limit stop 7 makes the inner chamber of adapter sleeve 4 produce local radius shrinkage region, the inner chamber diameter phi in the radius shrinkage region₄The diameter phi of the inner cavity of the primary salvaging main body 2₁Are equal.

When the two-stage three-ball fisher of the embodiment is applied to fishing the underground fallen fish with the diameter change, as the two-stage three-ball fisher descends in a shaft along with a drill rod, after the underground fallen fish enters the guide shoe 5, the part with the smaller diameter at the front end of the underground fallen fish passes through the second-stage fishing body 3 to enter the first-stage fishing body 2, and simultaneously, as the part with the larger diameter of the underground fallen fish enters the second-stage fishing body 3, the underground fallen fish pushes the first-stage steel balls 12 and the second-stage steel balls 14 to respectively ascend in the first-stage straight holes 11 and the second-stage straight holes 13, when the underground fallen fish relatively ascends and is limited by the limit stop 7, the downward conveying rotation is stopped to lift the two-stage three-ball fisher, and at the moment, the relative movement between the first-stage fishing body 2 and the second-stage fishing body 3 and the underground fallen fish, 3 first-

stage steel balls

12 and 3 second-stage steel balls 14 respectively descend in the first-stage straight hole 11 and the second-stage straight hole 13 and are respectively clamped on the circumference of the smaller-diameter part and the larger-diameter part of the underground fish in a clamping manner, so that the underground fish is firmly and stably clamped on the two-stage three-ball fisher and is lifted to the ground along with a drill stem. After the fishing well is fished out, firstly, two limit stoppers 7 are removed from the connecting sleeve 4, the limit restriction of the limit stoppers 7 on the upward movement of the underground fish is released, so that the underground fish can obtain a movable stroke distance H relative to the connecting sleeve 4, then, the connecting sleeve 4 is rotated, so that the first-stage fishing main body 2 and the second-stage fishing main body 3 can be respectively unscrewed and separated from the connecting sleeve 4 towards two ends simultaneously, in the process, the first-stage fishing main body 2 drives the underground fish to move upwards relative to the second-stage fishing main body 3, so that the second-stage steel balls 14 are loosened, the second-stage fishing main body 3 and the underground fish are separated from each other, and then, due to the limit of the limit stoppers 7, the first-stage fishing main body 2 can not move relative to the connecting sleeve 4, although the tendency of moving towards the direction of loosing and the steel balls 12 can be generated, the primary fishing body 2 and the fish falling downhole cannot be separated from each other at a first time; and then, exerting upward acting force on the underground fish, so that the underground fish moves upwards relative to the first-level fishing main body 2, loosening and loosening the first-level steel ball 12, separating the underground fish from the first-level fishing main body 2, and completing fishing operation and detachment separation of the underground fish.

Claims

1. A two-stage steel ball fisher, comprising: the fishing device comprises an upper connector (1), a primary fishing main body (2), a secondary fishing main body (3), a connecting sleeve (4) and a guide shoe (5);

top connection (1) with both ends all have the internal thread about adapter sleeve (4), one-level salvage main part (2) with both ends all have the external screw thread about second grade salvage main part (3), guide shoe (5) upper end has the internal thread, from last to down, top connection (1) one-level salvage main part (2) adapter sleeve (4) second grade salvage main part (3) with guide shoe (5) threaded connection forms the salvage barrel in proper order, wherein: the diameter phi of the inner cavity of the primary salvaging main body (2)₁Are respectively smaller than the diameter phi of the inner cavity of the connecting sleeve (4)₂And the diameter phi of the inner cavity of the second-stage fishing main body (3)₃The inner hole diameter and the diameter phi of the inner cavity of the primary salvaging main body (2) are embedded at the connecting end of the primary salvaging main body (2) and the connecting sleeve (4)₁The first-stage salvaging device comprises the same annular blocking piece (6), wherein 2-4 first-stage straight holes (11) communicated with an inner cavity are respectively formed in the shoulder on the upper part of the first-stage salvaging main body (2), and each first-stage straight hole isA first-stage steel ball (12) with the diameter corresponding to the aperture of the first-stage straight hole (11) and a first-stage return spring for supporting the first-stage steel ball (12) are respectively placed in the straight hole (11), the first-stage steel ball (12) is supported on the annular baffle (6) connected to the bottom of the first-stage straight hole (11), and is always contained in the first-stage straight hole (11) under the constraint of the first-stage straight hole (11), meanwhile, 2-4 second-stage straight holes (13) communicated with an inner cavity are respectively formed in the shoulder at the upper part of the second-stage salvaging main body (3), a second-stage steel ball (14) with the diameter corresponding to the aperture of the second-stage straight hole (13) and a second-stage return spring for supporting the second-stage steel ball (14) are respectively placed in each second-stage straight hole (13), and the second-stage steel ball (14) is supported on the guide shoe (5) connected to the bottom of the second-, is always contained in the secondary straight hole (13) under the constraint of the secondary straight hole (13).

2. The dual-stage steel ball fisher of claim 1, wherein: the aperture of the primary straight hole (11) is smaller than or equal to that of the secondary straight hole (13).

3. The dual-stage steel ball fisher of claim 1, wherein: the internal thread at the upper end of the connecting sleeve (4) is a right-handed internal thread, and the internal thread at the lower end of the connecting sleeve (4) is a left-handed internal thread.

4. The dual-stage steel ball fisher of claim 1, wherein: a limit stop (7) is arranged on the side wall of the connecting sleeve (4) to ensure that the inner cavity of the connecting sleeve (4) generates a local radial shrinkage area, and the diameter phi of the inner cavity of the radial shrinkage area₄Is more than or equal to the diameter phi of the inner cavity of the primary salvaging main body (2)₁Is less than or equal to the diameter phi of the inner cavity of the secondary fishing main body (3)₃。

5. The dual-stage steel ball fisher of claim 4, wherein: the limit stop blocks (7) are symmetrically arranged in 2 blocks along the circumference of the same section of the connecting sleeve (4).

6. A two-stage steel ball fisher as claimed in any one of claims 1 to 5, wherein: the number of the primary straight holes (11) on the primary fishing main body (2) is 3, and the primary straight holes are uniformly distributed along the circumferential section of the primary fishing main body (2); the secondary straight holes (13) in the secondary fishing main body (3) are provided in 3 numbers and are symmetrically distributed along the circumferential section of the secondary fishing main body (3).