CN201778716U

CN201778716U - Sealed spear

Info

Publication number: CN201778716U
Application number: CN2010202825152U
Authority: CN
Inventors: 周新华; 张高峰; 张康卫; 赵海军; 焦海中; 张淑平; 崔振启; 彭军; 杜新港
Original assignee: Dagang Oilfield Group Co Ltd
Current assignee: Dagang Oilfield Group Co Ltd
Priority date: 2010-08-05
Filing date: 2010-08-05
Publication date: 2011-03-30
Anticipated expiration: 2020-08-05

Abstract

The utility model provides a sealed spear which solves the problems that the conventional spear fails to seal the fishing area of the fishing chamber after the fishing operation, and fails to clean the captured material at the lower part on a sealed condition. The sealed fishing spear comprises an upper adapter, a retractable device, a fishing spear clamp, a core shaft and a guide cone head, wherein the retractable device is mounted on the outer circumference at the lower end of the upper adapter; the fishing spear clamp is mounted inside the corresponding clamp slot on the outer circumference of the core shaft; the upper adapter, the core shaft, a connecting sleeve, a sealing component and the guide cone head are fixedly connected in sequence; a non-return valve is arranged in the inner cavity of the upper adapter; axial liquid flow through-holes are formed on the core shaft, the sealing component and the guide cone head, which are positioned below the non-return valve; and an axial water trough is formed on the conical surface of the guide cone head. The sealed fishing spear has the benefits of reasonable structure and reliable seal performance, can complete the fishing operation and simultaneously clean the fishing chamber at the lower part, and effectively avoids the complex conditions of the well bore.

Description

Sealed fishing spear

Affiliated technical field

The utility model relates to a kind of well workover fishing instrument fishing spear, especially relates to a kind of sealed fishing spear.

Background technology

In the oil-water well heavy repair task,, in time salvage trouble of lost tool in hole and can prevent effectively that the pit shaft situation is further complicated because pit shaft technology status more complicated sleeve pipe may occur damaging or form trouble of lost tool in hole.One of trouble of lost tool in hole kind is the tubing junk, fishing spear is a conventional instrument of salvaging the tubing junk, for example: Chinese utility model patent " a kind of trouble of lost tool in hole drags for lance " (publication number CN201100112), by top connection, mandrel, slips is formed, mandrel top is cylindrical, the bottom is a cone, uniform three shoulders on the cone face of the bottom of mandrel, slips directly is enclosed within on the mandrel, the bottom of slips is provided with three uniform slip grooves that shoulder matches on three bottom cone faces with mandrel, it can realize activity unfreezing energetically, but not only back-off but also can withdraw from is safely avoided junk is fallen to loose, do not open the generation of the complicated accidents of down-hole situation such as button.Drag for lance behind this fishing spear engaging fish and can not salvage position formation sealing at the fish inner chamber, pressure in the tubing string leaks from the gap generation of dragging between lance tooth and the fish chamber contact surface, can't seal cleaning to the bottom fish, can not stop high pressure in the fish chamber, bottom to external leakage.

The utility model content

To drag for lance behind the existing fishing spear engaging fish and can not form sealing salvaging the position in order to overcome at the fish inner chamber, can't seal the deficiency of cleaning to the bottom fish, the utility model provides a kind of sealed fishing spear, sealing formula fishing spear can realize dragging for the sealing of a lance and a fish inner chamber behind fishing string, prevent that the high pressure in the tubing string from leaking, and can wash operation fish chamber, bottom.

The technical scheme that its technical problem that solves the utility model adopts is: but sealed fishing spear comprises the top connection unloading device, drags for the lance slips, mandrel, leading cone head, but unloading device is installed on the excircle of top connection lower end, drag for the lance slips and be installed on the mandrel excircle in the corresponding slip groove, top connection, mandrel, adapter sleeve, black box, leading cone head are fixedly connected sequentially; In the inner chamber of top connection ball-and-seat is installed; On the mandrel of ball-and-seat below, black box, the leading cone head axial liquid opening is arranged; On the cone surface of leading cone head axial tank is arranged.On the cylindrical of the sealing mandrel of black box middle part leather cup is installed, sealing mandrel middle part cylindrical is greater than the diameter of axle at both ends up and down; The leather cup back-off is sleeved on the sealing mandrel cylindrical, and the inner convex platform of leather cup upper end is fixedly mounted between adapter sleeve lower end and the sealing mandrel stepped end face.The top connection endoporus is installed with baffle plate, and baffle plate has centre bore and axial flowing hole; The inner convex platform of top connection endoporus baffle plate top is the ball-and-seat valve seat; The spool of ball-and-seat is fixedlyed connected with righting rod, and the righting rod lower end is installed in its centre hole, on the righting rod body of rod between baffle plate and the spool spring is installed.

The beneficial effects of the utility model are that rational in infrastructure, sealing is reliable, when finishing fishing operation is washed in fish chamber, bottom, prevents that effectively the pit shaft situation is further complicated.

Description of drawings

Fig. 1 is the structural representation of the sealed fishing spear of the utility model.

Among the figure: 1. top connection, 2. ball-and-seat, 3. mandrel, but 4. unloading device, 5. adapter sleeve, 6. black box, 7. leading cone head, 8. sealing mandrel, 9. leather cup 10. drags for the lance slips, 11. guide finger, 12. sliding sleeves, 13. axial flowing holes, 14. baffle plate, 15. righting rods, 16. springs, 17. spool, 18. axial liquid openings, 19. tanks.

The specific embodiment

The utility model is described in further detail below in conjunction with drawings and Examples.

But the sealed fishing spear of the utility model comprises top connection 1, ball-and-seat 2, mandrel 3 unloading devices 4, drags for lance slips 10, adapter sleeve 5, black box 6, leading cone head 7 etc., and top connection 1, mandrel 3, adapter sleeve 5, black box 6, leading cone head 7 are fixedly connected sequentially; Ball-and-seat 2 is installed in the inner chamber of top connection 1.

But unloading device 4 is installed on the excircle of top connection 1 bottom, but on the sliding sleeve 12 of unloading device 4 L type rail groove is arranged, and the guide finger 11 that is fixedly mounted in the top connection 1 can slide along L type rail groove.Drag for lance slips 10 and be installed on mandrel 3 excircles in the corresponding slip groove, fixedly connected with the sliding sleeve 12 of unloading device 4 but drag for lance slips 10 upper ends; The mandrel 2 that drags for lance slips 10 belows is up-small and down-big cone, drags for lance slips 10 lower ends and can open along cone.Axial liquid opening 18 is arranged on the mandrel 3 of ball-and-seat 2 belows, black box 6, the leading cone head 7.Axial tank 19 is arranged on the cone surface of leading cone head 7.

Black box 6 comprises sealing mandrel 8 and leather cup 9, fixedlys connected with adapter sleeve 5 in sealing mandrel 8 upper ends, and fixedlying connected with leading cone head 7 in the lower end, adopts usually to be threaded.The sealing mandrel 8 middle part diameters of axle are greater than the diameter of upper/lower terminal connecting thread, leather cup 9 is installed in sealing mandrel 8 middle parts, back-off is sleeved on the sealing mandrel 8 middle part cylindricals, the inner convex platform of leather cup 9 upper ends is between adapter sleeve 5 lower ends and sealing mandrel 8 ladder end faces, and the connecting thread that passes through to adjust adapter sleeve 5 and seal mandrel 8 is installed the leather cup axial restraint.

Ball-and-seat 2 is installed in the inner chamber of top connection 1.Top connection 1 is a valve body, and the inner convex platform of screw thread below, top connection 1 endoporus upper end is ball-and-seat 2 valve seats; Valve seat below is installed with baffle plate 14, adopt usually be threaded or welding manner fixedly connected; One segment distance is arranged between baffle plate 14 and the valve seat.Centre bore and axial flowing hole 13 are arranged on the baffle plate 14; The spool 17 of ball-and-seat 2 is fixedlyed connected with righting rod 15 or is one, righting rod 5 lower ends are installed in the centre bore of baffle plate 14, on righting rod 15 bodies of rod between baffle plate 14 and the spool 17 spring 16 is installed, the body of rod can slide up and down in the centre bore of baffle plate 14.

The sealed fishing spear of the utility model has salvaging, sealflushes, is with operations such as pressing the tubing string that makes a trip, the assembling of sealed fishing spear finished be installed in the lower end of fishing string, at this moment, guide finger 11 is positioned at the level trough of L type on the sliding sleeve 12, the parts relative fixed of sealed fishing spear, it is as follows to implement operation process:

Sealing: at first fishing string is lowered in the pit shaft, leading cone head 7 with leather cup assembly 6, drag for lance slips 10 and introduce the fish inner chambers; Rotate tubing string then, make guide finger 11 be positioned at the vertical channel of L type rail groove on the sliding sleeve 12; The upper lifting pipe post, mandrel 3 moves up, and drags for the cone of lance slips 10 lower ends along mandrel 3 lower ends and opens, and drags for lance slips 10 fish is dragged for; The tank 19 that leading cone head 9 sides distribute, the pressure in the fish chamber can make progress pressure transmission to sealing cup 9 by tank 19, makes leather cup 9 swellings, is close to the fish cavity wall, thereby realizes sealing; Axially liquid opening 18 interior wells press and walk to ball-and-seat 2 simultaneously, and in the effect of well pressure and spring 16, the spool 17 of ball-and-seat 2 goes upward to valve seat and realizes sealing.

Sealflush: the liquid that injects in the oil pipe of fishing string top, overcome the resistance of ball-and-seat 2 medi-springs 16, promotion spool 17 moves down opens ball-and-seat 2, the flushing liquid that injects enters the fish chamber by axial liquid opening 18, the tank 19 that partially liq distributes along leading cone head 9 sides upwards flows, make leather cup 9 further swelling sealings, injection liquid can only be flowed downward, and can not leak from top of fish.

Band has been pressed lower tubular column: situation about stopping up in can't implementing for tubing string in the Operating Pressure process, can utilize the sealed fishing spear of the utility model to close down, by the mode of the airtight salvaging of well head, upper lifting pipe post, hydraulic pressure gate slips chucking, tubing string back-off tubing string be pursued root and trip out in the blowout preventer assembly.

Salvage: guide finger 11 is placed in the L type rail groove vertical track, after leading cone head 7 will drag for lance slips 10 introducing fish inner chambers, at the effect lower seal assembly 6 of pressurization and drag for lance slips 10 and enter the fish chamber, on carry fishing string, mandrel 3 is up thereupon, drags for lance slips 10 and keeps motionless with the fish inwall under the frictional force effect, by up conical section distending, external diameter increases, and is stuck on the tube inner wall tightly.

Withdraw from: to top of fish pressurization, mandrel 3 is descending thereupon, drag for lance slips 10 be subjected to its root can move back ring restriction (can move back ring contact with the fish end face) can not be descending, so and mandrel 3 cone maximum gauges partly throw off, while guide finger 11 comes downwards to L type rail groove bottom; At this moment, positive tube post, top connection 1 drive guide finger 11 be transferred to L type track groove level trough in, it is fixing to drag for lance slips 10, can not move up and down, and continues the upper lifting pipe post, sealed fishing spear can withdraw from fish.

It should be noted that the foregoing description is example and unrestricted the present invention, those skilled in the art can design a lot of alternate embodiments and not break away from the scope of claims.

Claims

1. sealed fishing spear, but comprise the top connection unloading device, drag for the lance slips, mandrel, leading cone head, but unloading device is installed on the excircle of top connection lower end, drag for the lance slips and be installed on the mandrel excircle in the corresponding slip groove, it is characterized in that: top connection (1), mandrel (3), adapter sleeve (5), black box (6), leading cone head (7) are fixedly connected sequentially; Ball-and-seat (2) is installed in the inner chamber of top connection (1); On the mandrel (3) of ball-and-seat (2) below, black box (6), the leading cone head (7) axial liquid opening (18) is arranged; Axial tank (19) is arranged on the cone surface of leading cone head (7).

2. according to the described sealed fishing spear of claim 1, it is characterized in that: on the cylindrical of the sealing mandrel (8) of described black box (6) middle part leather cup (9) is installed, sealing mandrel (8) middle part cylindrical is greater than the diameter of axle at both ends up and down; Leather cup (9) back-off is sleeved on sealing mandrel (8) cylindrical, and the inner convex platform of leather cup (9) upper end is fixedly mounted between adapter sleeve (5) lower end and sealing mandrel (8) the ladder end face.

3. according to the described sealed fishing spear of claim 2, it is characterized in that: described top connection (1) endoporus is installed with baffle plate (14), and baffle plate (14) has centre bore and axial flowing hole (13); The inner convex platform of top connection (1) endoporus baffle plate (14) top is ball-and-seat (a 2) valve seat; The spool (17) of ball-and-seat (2) is fixedlyed connected with righting rod (15), and righting rod (15) lower end is installed in the centre bore of baffle plate (14), is positioned on righting rod (15) body of rod between baffle plate (14) and the spool (17) spring (16) is installed.