CN204960862U - Fluid pressure type can move back and drag for lance - Google Patents

Abstract

The utility model discloses a fluid pressure type can move back and drag for lance, including lance pole and slips, the upper portion and the upper portion of lance pole connect built -up connection, just the axial oilhole and radial oilhole of mutual switch -on are seted up to the upper portion of lance pole, are equipped with the sleeve through return spring set on the lance pole outer wall more than radial oilhole, the lower part of lance pole has the conical nose to down slips hole enlargement, on the lance pole of slips suit more than the conical nose, the top of the upper portion of slips and telescopic lower part built -up connection and slips is less than the radial oilhole on the lance pole, makes up into the biography pressure hydraulic cylinder that the annular space was described between the top of this slips and lance pole outer wall and the sleeve inner wall. The utility model discloses the effect that utilizes in the hydraulic cylinder hydraulic pressure and reset spring realizes the reciprocating action of slips, and it has effectively compromise tensile and antitorque with simple construct in use, and then effectively is applicable to multiple complicated hole condition, makes the salvage flexibility of fish in the well, and is reliable practical.

Description

Fluid pressure type returnable fishing spear

Technical field

The utility model relates to oil well falling-matter fishing tool, specifically a kind of fluid pressure type returnable fishing spear.

Background technology

Dragging for lance is for salvaging the conventional fishing tool of fish in well in oil mining, and its difference according to down-hole fish (such as fish is divided into tubing junk, bar class junk, rope class junk and small falling object etc.) is and of a great variety.So according to its architectural characteristic, at present, the conventional lance that drags for is divided into the non-returnable fishing spear of slide block type and screw type returnable fishing spear.

But find through the structural analysis of these being dragged for lance, the use general character of the non-returnable fishing spear of slide block type is: in use can only tension but not antitorque; The use general character of spiral returnable fishing spear is: in use can only antitorque but not tension.Thus, existing predominate architecture drags for lance and limits because of its structure, in use there is applicable elements is single, limit salvaging measure technical problem, practicality and poor reliability.

Technical problem existing for lance is dragged in order to effectively solve existing predominate architecture, various fluid pressure type returnable fishing spear is have developed in industry, disclosed " retreating hydraulic slip spear " (publication number: CN201068764, the publication date: on June 4th, 2008) of such as Chinese patent literature.This technology utilizes the structural principle of hydraulic system, and shaft is formed can the fluid cylinder of topping up force feed and slips in the form of piston, thus utilizes the conical nose in shaft to drag for the expanding card of descending slips, utilizes the reset of fluid cylinder release and back-moving spring to receive footpath to exit.But this technology is unreasonable because of its structure design, is being used in existence: 1. slip travel very critical and easily occur jam phenomenon in reseting procedure, practicality and poor reliability; 2. overall structure is too complicated, and the problem of fluid seepage easily occurs fluid cylinder, have impact on reliability further.

Summary of the invention

Goal of the invention of the present utility model is: for above-mentioned existing deficiency of dragging for lance, provide a kind of structure simple, reliable and practical, take into account tension and antitorque fluid pressure type returnable fishing spear.

The technical scheme that the utility model adopts is: a kind of fluid pressure type returnable fishing spear, comprise shaft and slips, top and the top sub of described shaft are connected, and the top of described shaft offers the axial oilhole and radial direction oil hole mutually connected, shaft outer wall more than radial direction oil hole is set with sleeve by back-moving spring, and the bottom of described shaft has the conical nose expanding to descending slips; Described slip sleeve is contained in the shaft of more than conical nose, the top of slips and the bottom of sleeve be connected and the top of slips lower than the radial direction oil hole in shaft, the top of this slips and be combined into the pressure transmission fluid cylinder of annular space shape between shaft outer wall and sleeve lining.

Further, the outer wall of described shaft is provided with the boss of outwardly convex, and this boss is in above the radial direction oil hole in shaft.

Further, described shaft is formed primarily of the expanding cone of central upper portion pipe and bottom of one; Or described shaft forms primarily of the expanding cone Connecting groups conjunction of central upper portion pipe and bottom of split.

Further, the external wall of upper portion of described shaft is up-small and down-big variable-diameter structure, and this reducing length range in shaft corresponds to the sliding stroke of sleeve, and the tapering of shaft external wall of upper portion is 0.5 ~ 3 °.

Further, the conical nose peripheral outer wall tapering of described shaft is 5 ~ 15 °.

Further, the bottom surface of the conical nose of described shaft is the cone structure to lower convexity.

Further, the bottom surface tapering of described conical nose is 15 ~ 75 °.

Further, on described sleeve, radial direction is provided with pressure relief vent.

Further, the outer wall of described shaft is provided with the sealing ring be slidably matched with sleeve; The inwall of described slips is provided with the sealing ring be slidably matched with shaft.

The beneficial effects of the utility model are:

1. the above-mentioned lance that drags for is according to Hydraulic System Principle, shaft defines fluid cylinder and using slips as piston, thus utilize the effect of hydraulic pressure and back-moving spring in fluid cylinder to realize the reciprocating action of slips, this drags for lance and has in use effectively taken into account tension and antitorque with simple structure, and then be effectively applicable to Various Complex hole condition, make the salvaging flexibility of fish in well, reliability is high, practical;

2. above-mentioned shaft, especially conical nose structure of dragging for lance, ensureing under the prerequisite of salvaging intensity, effectively prevent stress and concentrate and destruction to fishing tool, the occlusion of slips to fish of outer is effective simultaneously.

Accompanying drawing explanation

Below in conjunction with accompanying drawing, the utility model is further described.

Fig. 1 is a kind of structural representation of the present utility model.

Code name implication in figure: 1-top sub; 2-central tube; 3-back-moving spring; 4-sleeve; 5-sealing ring; 6-pressure transmission fluid cylinder; 7-boss; 8-slips; 9-expanding cone; 10-axial oilhole; 11-pressure relief vent; 12-radial direction oil hole.

Detailed description of the invention

embodiment 1

See Fig. 1: the utility model comprises shaft and slips 8.Wherein, shaft primarily of split central upper portion pipe 2 and the expanding cone 9 in bottom threadably (or welding) is connected and combines, be i.e. central tube 2 and the linking of expanding cone 9 axial order.

The external wall of upper portion of central tube 2 and the inwall of top sub 1 are connected threadably, and top sub 1 enters well casing string for connecting other; Central tube 2 offers the axial oilhole 10 passing to middle and lower part, and offer radial direction oil hole 12 on the central tube 2 corresponding to the end of axial oilhole 10, axial oilhole 10 and radial direction oil hole 12 are connected mutually; Central tube 2 outer wall at the upper side of radial direction oil hole 12 is provided with outwardly convex one circle boss 7, namely this boss 7 miss radial direction oil hole 12 position can, must not shutoff.The middle and upper part outer wall of central tube 2 is set with back-moving spring 3, and namely the bottom of this back-moving spring 3 is sitting on the boss 7 of central tube 2, and top is towards top sub 1; Foregoing reset spring 3 is covered by the sleeve 4 be sleeved on central tube 2, namely the top of back-moving spring 3 is connected to the inner top of sleeve 4, this sleeve 4 slip cap is contained on central tube 2, the aperture, top of sleeve 4 and the central tube 2 outer wall matched in clearance of boss more than 7, boss 7 outer wall snug fit on the bottom larger caliber of sleeve 4 and central tube 2, in order to ensure the two tight ness rating coordinated, the periphery wall of boss 7 is provided with the sealing ring 5 contacted with sleeve 4 inner tight, the bottom extend through boss 7 of sleeve 4; On aforementioned sleeves 4, radial direction offers multiple pressure relief vent 11, the compression travel of offering position corresponding back-moving spring 3 of these pressure relief vents 11 on sleeve 4.

Expanding cone 9 is made up of columnar part integrally and conical nose, and the outline of columnar part corresponds to the outline of central tube 2, and conical nose is in the bottom of expanding cone 9, for expanding to following descending slips 8.The tapering span of the peripheral outer wall (i.e. the descending guide wall of slips 8) of aforementioned conical nose is 5 ~ 15 °, this is worth too small meeting and is unfavorable for descending slips 8 expanding, this value crosses the structural stress that conference increases expanding cone 9, and then affect working strength, thus preferred median in aforementioned range, such as 7 °, 9 ° or 13 ° etc., specifically depending on concrete fish situation.In use can effectively snap in fish to make the utility model, the bottom surface of aforementioned conical nose is also pyramidal structure, concrete, the bottom surface of conical nose is the cone structure to lower convexity, the concrete tapering span of its bottom surface is 15 ~ 75 °, this value is too small, excessive all can be affected snap in reliability, thus preferred median in aforementioned range in fish, such as 25 °, 35 °, 50 ° or 60 ° etc.

The upper inside wall of slips 8 is close to the columnar part outer wall (i.e. central tube 2 outer wall of boss less than 7 and the columnar part outer wall of expanding cone 9) of shaft, in order to ensure the cooperation tight ness rating of the two, slips 8 upper inside wall is provided with sealing ring 5, and slips 8 is by sealing ring 5 and corresponding columnar part close contact, the external wall of upper portion of slips 8 threadedly Connecting groups is combined in the bottom (being in boss less than 7) of sleeve 4, under original state, the bottom of slips 8 is not expanding by the conical nose of expanding cone 9, thus slips 8 is closely sleeved in the shaft of more than conical nose, the top of slips 8 and the bottom of sleeve 3 are connected, and the top of slips 8 is lower than the radial direction oil hole 12 in shaft, and then make the top of slips 8 and between shaft outer wall (comprising boss 7 bottom surface) and sleeve 4 inwall, be combined into the annular clearance of annular space shape, this annular clearance communicates with the radial direction oil hole 12 on central tube 2, annular clearance is made to form the pressure transmission fluid cylinder 6 of acting.

With this, during use, hydraulic oil injects pressure transmission fluid cylinder 6 by the axial oilhole 10 on central tube 2 and radial direction oil hole 12, thus it is descending and block fish by the conical nose of expanding cone 9 is expanding to promote slips 8, meanwhile, slips 8 is with moving sleeve 4 descending, and back-moving spring 3 is compressed; When needs exit fish, by giving pressure transmission fluid cylinder 6 release, thus back-moving spring 3 is resetted, pull slips 8 up, up slips 8 bore reduces, exits fish.

Based on this, reliable guarantee sleeve 4 slides to can reset on central tube 2, can consider central tube 2 outer wall of boss more than 7 that certain pyramidal structure is set, namely central tube 2 outer wall of boss more than 7 is up-small and down-big low-angle variable-diameter structure (this reducing length range corresponds to the sliding stroke of sleeve 4), the tapering span of central tube 2 outer wall is herein 0.5 ~ 3 °, this value is too small is unfavorable for that sleeve 4 reliably slides, this value crosses conference affects the reliability and stability coordinated between sleeve 4 and central tube 2, therefore preferred median in aforementioned range, such as 1 °, 1.5 ° or 2 ° etc.

embodiment 2

Other structure of the present embodiment is identical with embodiment 1, and difference is: the structure of shaft.Concrete, shaft is designed to integrative-structure, namely the central tube on top and the expanding cone of bottom are formed in one structure, be equivalent to by constant for the conical nose of the expanding cone in embodiment 1, columnar part extended form integrative-structure shaft with this, axial oilhole now from backing down in the middle part of shaft, radial direction oil hole offers in the middle part of shaft.Though this kind of structure is more tending towards simplifying.

The various embodiments described above only in order to the utility model to be described, are not intended to limit.Although be described in detail the utility model with reference to the various embodiments described above, those of ordinary skill in the art is to be understood that: it still can be modified to the concrete technical scheme in the various embodiments described above, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of technical solutions of the utility model.

Claims (9)

1. a fluid pressure type returnable fishing spear, comprise shaft and slips (8), it is characterized in that: the top of described shaft and top sub (1) are connected, and the top of described shaft offers the axial oilhole (10) and radial direction oil hole (12) mutually connected, shaft outer wall more than radial direction oil hole (12) is set with sleeve (4) by back-moving spring (3), and the bottom of described shaft has the conical nose expanding to descending slips (8); Described slips (8) is sleeved in the shaft of more than conical nose, the top of slips (8) and the bottom of sleeve (3) be connected and the top of slips (8) lower than the radial direction oil hole (12) in shaft, the top of this slips (8) and be combined into the pressure transmission fluid cylinder (6) of annular space shape between shaft outer wall and sleeve (4) inwall.

2. fluid pressure type returnable fishing spear according to claim 1, is characterized in that: the outer wall of described shaft is provided with the boss of outwardly convex (7), and this boss (7) is in radial direction oil hole (12) top in shaft.

3. fluid pressure type returnable fishing spear according to claim 1 or 2, is characterized in that: described shaft is formed primarily of the central upper portion pipe (2) and bottom expanding cone (9) of one; Or described shaft to be connected with the expanding cone in bottom (9) primarily of the central upper portion pipe (2) of split and to combine.

4. fluid pressure type returnable fishing spear according to claim 3, it is characterized in that: the external wall of upper portion of described shaft is up-small and down-big variable-diameter structure, this reducing length range in shaft corresponds to the sliding stroke of sleeve (4), and the tapering of shaft external wall of upper portion is 0.5 ~ 3 °.

5. fluid pressure type returnable fishing spear according to claim 1, is characterized in that: the conical nose peripheral outer wall tapering of described shaft is 5 ~ 15 °.

6. fluid pressure type returnable fishing spear according to claim 1 or 5, is characterized in that: the bottom surface of the conical nose of described shaft is the cone structure to lower convexity.

7. fluid pressure type returnable fishing spear according to claim 6, is characterized in that: the bottom surface tapering of described conical nose is 15 ~ 75 °.

8. fluid pressure type returnable fishing spear according to claim 1, is characterized in that: the upper radial direction of described sleeve (4) is provided with pressure relief vent (11).

9. fluid pressure type returnable fishing spear according to claim 1 or 2, is characterized in that: the outer wall of described shaft is provided with the sealing ring (5) be slidably matched with sleeve (4); The inwall of described slips (8) is provided with the sealing ring (5) be slidably matched with shaft.