CN201843556U

CN201843556U - Hydraulic withdrawable overshot

Info

Publication number: CN201843556U
Application number: CN2010205683420U
Authority: CN
Inventors: 赵公利; 艾教银; 张国良; 吕丰; 史健搏; 李艳秋; 李悦
Original assignee: Daqing Oilfield Co Ltd
Current assignee: Daqing Oilfield Co Ltd
Priority date: 2010-10-20
Filing date: 2010-10-20
Publication date: 2011-05-25
Anticipated expiration: 2020-10-20

Abstract

The utility model relates to an underground fishing tool, in particular to a hydraulic withdrawable overshot, which can withdraw smoothly when continuous oil pipe construction tubular columns are in complex conditions under a shaft or cannot realize jam release, and guarantees safety of the tubular columns. The lower end of an upper joint is inserted in the upper end of an upper body, the lower end of the upper joint is in threaded connection with the upper end of the upper body, the lower end of the upper body is inserted in the upper end of a lower body, the lower end of the upper body is in threaded connection with the upper end of the lower body, a piston is mounted in the upper body, the outer side wall of the upper end of the piston contacts with the inner wall of the lower end of the upper joint, the lower end of the piston contacts with the inner wall of the upper body, a first spring is mounted in an annular cavity between the upper body and the piston, a draw bar is disposed in the lower body, the upper end of the draw bar is in threaded connection with the lower end of the piston, a second spring is mounted in an annular cavity between the upper body and the draw bar and sleeved with a retaining ring, a standby cap is sleeved at the lower end of the draw bar and is in threaded connection with the lower end of the draw bar, and slips are mounted in the lower body. The hydraulic withdrawable overshot is mainly applicable to continuous oil pipe jam release and fishing tubular columns for realizing falling object jam release and fishing.

Description

Hydraulic pressure can move back dipper

Technical field

The utility model relates to a kind of down-hole fishing tool, is specifically related to a kind of hydraulic pressure and can moves back dipper.

Background technology

At present, the moved back dipper that uses when the junk body is salvaged in conventional well workover, salvaging junk can't unfreezing the time, must withdraw from by tube post rotation back-off, but incompatibility when being applied to horizontal well coiled tubing unfreezing fishing, mainly showing as coiled tubing unfreezing fishing tubing string can not rotate, can't unfreezing the time, can not withdraw from by the mode of rotation tubing string, construction risk is big.Therefore say that the existing dipper that moves back can't guarantee that the coiled tubing operating tool string runs into complex situations or can't can withdraw from smoothly during unfreezing in the down-hole

The utility model content

The purpose of this utility model provides a kind of hydraulic pressure can move back dipper, runs into complex situations in the down-hole or can't can withdraw from assurance tubing string safety during unfreezing smoothly to realize the coiled tubing operating tool string.

The utility model is to solve the problems of the technologies described above the technical scheme of taking to be:

Hydraulic pressure described in the utility model can move back dipper and comprise top connection, upper body, piston, first spring, pull bar, second spring, back-up ring, screw, be equipped with cap, following body and slips, the lower end of top connection is inserted in the upper end of upper body and the two is threaded, the lower end of upper body is inserted into down in the upper end of body and the two is threaded, piston is installed in the upper body and the upper end lateral wall of piston contacts with the lower end inwall of top connection, the lower end of piston contacts with the inwall of upper body, toroidal cavity between upper body and piston is equipped with first spring, pull bar is arranged on down in the body and the upper end of pull bar is threaded with the lower end of piston, toroidal cavity between upper body and the pull bar is equipped with second spring, be set with back-up ring on second spring, be equipped with cap sleeve on the lower end of pull bar and the two be threaded, slips is installed in down in the body, and the upper surface of slips is with cap is affixed fully.

The beneficial effects of the utility model are: the utility model has overcome the conventional dipper tube post when the salvaging junk is withdrawed from by card that can move back and has rotated the inadaptability that withdraws from, realized not rotating tubing string, by transferring tubing string, suppress the purpose that withdraws from then, realized withdrawing from transformation, and had simple to operate, safe and practical, high reliability features to the hydraulic pressure withdrawing mode by machinery.Hydraulic pressure of the present invention can move back dipper and be applicable to that mainly coiled tubing unfreezing fishing tubing string carries out the application of junk unfreezing fishing.

Description of drawings

Fig. 1 is the structural representation (among the figure: the 1-top connection 2-upper body 3-cushion rubber 4-piston 5-first spring 6-cushion rubber 7-cushion rubber 8-pull bar 9-second spring 10-back-up ring 11-screw 12-is equipped with body 15-slips under the cap 13-cottor pin 14-) that hydraulic pressure described in the utility model can move back dipper.

The specific embodiment

The specific embodiment one: as shown in Figure 1, the described hydraulic pressure of present embodiment can move back dipper and comprise top connection 1, upper body 2, piston 4, first spring 5, pull bar 8, second spring 9, back-up ring 10, screw 11, be equipped with cap 12, following body 14 and slips 15, the lower end of top connection 1 is inserted in the upper end of upper body 2 and the two is threaded, the lower end of upper body 2 is inserted into down in the upper end of body 14 and the two is threaded, piston 4 is installed in the upper body 2 and the upper end lateral wall of piston 4 contacts with the lower end inwall of top connection 1, the lower end of piston 4 contacts with the inwall of upper body 2, toroidal cavity between upper body 2 and piston 4 is equipped with first spring 5, pull bar 8 is arranged on down in the body 14 and the upper end of pull bar 8 is threaded with the lower end of piston 4, toroidal cavity between upper body 2 and the pull bar 8 is equipped with second spring 9, be set with back-up ring 10 on second spring 9, be equipped with on the lower end that cap 12 is enclosed within pull bar 8 and the two is threaded, slips 15 is installed in down in the body 14, and the upper surface of slips 15 is with cap 12 is affixed by screw 11 fully.

The specific embodiment two: as shown in Figure 1, the described hydraulic pressure of present embodiment can move back dipper and also comprise first cushion rubber 3, second cushion rubber 6 and the 3rd cushion rubber 7, described first cushion rubber 3 is arranged between the upper end lateral wall of the lower end inwall of top connection 1 and piston 4, described second cushion rubber 6 is arranged between the respective inside wall of the lower end lateral wall of piston 4 and upper body 2, and described the 3rd cushion rubber 7 is arranged between the respective outer wall of the lower end inwall of upper body 2 and pull bar 8.A plurality of cushion rubbers are set, can improve the sealing performance that hydraulic pressure can move back dipper greatly.Other composition and annexation are identical with the specific embodiment one.

The specific embodiment three: as shown in Figure 1, the described hydraulic pressure of present embodiment can move back dipper and also comprise cottor pin 13, and described cottor pin 13 is arranged on the lower surface of pull bar 8.13 fixed operations of cottor pin prevent to emit fully the possible effect that comes off.Other composition and annexation are identical with the specific embodiment one or two.

Operating principle:

As shown in Figure 1.When instrument drags for when obtaining junk and can't separate calorie requirement and withdraw from, at first transfer tubing string, make instrument not be subjected to tension, suppress on ground then, this moment, pressure acted on piston 4, and piston 4 pushing drawing rods 8 move downward, and then produce the gap between fishing slip 15 and the following body 14, then slips 15 and quilt are dragged between the junk and are become flexible, and the upper lifting pipe post is realized withdrawing from.

Hydraulic pressure can move back dipper and cooperate coiled tubing unfreezing fishing tubing string that junk is implemented to salvage, and is connected tubing string bottom.At first instrument is introduced and carried out normal unfreezing fishing in the fish chamber; If tubing string is then transferred in not unfreezing, junk is stressed slightly; Then, in coiled tubing, suppress 25-30MPa, on carry and withdrawing from.

According to the borehole size of salvaging the junk body dimension and implementing to salvage, the present invention has different specifications, to realize the unfreezing fishing to the different specification size junk, can make the series of tools of different size according to actual needs.

Claims

1. a hydraulic pressure can move back dipper, described hydraulic pressure can move back dipper and comprise top connection (1), upper body (2), piston (4), first spring (5), pull bar (8), second spring (9), back-up ring (10), screw (11), be equipped with cap (12), following body (14) and slips (15), it is characterized in that: the lower end of top connection (1) is inserted in the upper end of upper body (2) and the two is threaded, the lower end of upper body (2) is inserted into down in the upper end of body (14) and the two is threaded, piston (4) is installed in the upper body (2) and the upper end lateral wall of piston (4) contacts with the lower end inwall of top connection (1), the lower end of piston (4) contacts with the inwall of upper body (2), toroidal cavity between upper body (2) and piston (4) is equipped with first spring (5), pull bar (8) is arranged on down in the body (14) and the upper end of pull bar (8) is threaded with the lower end of piston (4), toroidal cavity between upper body (2) and the pull bar (8) is equipped with second spring (9), be set with back-up ring (10) on second spring (9), be equipped with on the lower end that cap (12) is enclosed within pull bar (8) and the two is threaded, slips (15) is installed in down in the body (14), and the upper surface of slips (15) is with cap (12) is affixed fully.

2. hydraulic pressure according to claim 1 can move back dipper, it is characterized in that: described hydraulic pressure can move back dipper and also comprise first cushion rubber (3), second cushion rubber (6) and the 3rd cushion rubber (7), described first cushion rubber (3) is arranged between the upper end lateral wall of the lower end inwall of top connection (1) and piston (4), described second cushion rubber (6) is arranged between the respective inside wall of the lower end lateral wall of piston (4) and upper body (2), and described the 3rd cushion rubber (7) is arranged between the respective outer wall of the lower end inwall of upper body (2) and pull bar (8).

3. hydraulic pressure according to claim 2 can move back dipper, it is characterized in that: described hydraulic pressure can move back dipper and also comprise cottor pin (13), and described cottor pin (13) is arranged on the lower surface of pull bar (8).