CN202000943U - Spirally-guided retrievable salvaging spear - Google Patents

Abstract

The utility model discloses a spirally-guided retrievable salvaging spear, which comprises a catch hoop, a spindle and a slip. The slip is equipped on the outside of the spindle. The bottom end of the spindle is provided with a guiding shoe. The guiding shoe which has a diameter gradually decreasing from up to bottom has a conical structure. The guiding shoe is provided with a threaded guide groove. The spindle part below the slip is provided with limiting steps. The spirally-guided retrievable salvaging spear in the utility model aims to salvage underground fallen objects with top peripheries covered by wire-shaped hindrances. By converting the driving force of the wire-shaped hindrances from axial force into radial force and then separating the wire-shaped hindrances, the spear in the utility model is then enabled to reach a chamber of underground fallen objects and salvage the fallen objects. The spirally-guided retrievable salvaging spear in the utility model has the characteristics of easy retrieval of fallen objects, simple structure, flexible operation, good concertedness, high working success rate, fallen object top damaging difficulty, high tension load, big impact resistance load, cyclic fallen object top flushing capability and low cost, etc.

Description

The spirally-guided reversible drags for lance

Technical field

The utility model relates to the fishing tool of junk in the oil gas well well, specifically is that a kind of spirally-guided reversible drags for lance, and it can be applicable to the fish salvaging of various complicated down-holes, particularly salvages the top and reach the fish that is coated with the wire barrier on every side in well.

Background technology

The existing most of oil of China, the natural gas well enter the middle and later periods exploitation in succession, along with increasing of the increase of the prolongation of production time, construction well depth and construction times makes hole condition variation day by day, well in operation and big well workover are also increasing year by year, the tool kind that is used to handle down-hole accident now is various, the diversity of workover tool, reliability, validity, practicality and popularity have determined the success rate of this well operations and ageing to a great extent, various workover tools use and research and develop the attention that more and more causes underground operators.

At the salvaging of fish in the well, the instrument of present domestic use has a lot, drags for lance, saves to bind round and drag for lance etc., their each have their own scope of application and advantages such as slide block slips fishing spear, waterpower.But TOF and when having the overcover of a large amount of steel wires or linear structure on every side in well, none can really use above-mentioned fishing tool, because the residual steel wire of breaking in fish head top is that sub-thread is netted, under the effect of self-characteristic, formula is Texturized in the shape of a spiral, in disorder coiling, the serious fish fishing tool that hinders enters the fish chamber, if adopt outer method of dragging for, female coupling tap is salvaged, just in case can not propose well after catching, can only take an unnecessary way, open from safety joint, this will consider to have salvaged safety joint; If adopting dipper salvages, owing to hinder engagement with the fish after having the broken end steel wire to thrust track, after not at all easy the catching, the invar silk thrusts track influence transition, the fishing tool jam can not propose well, if take out fishing tool, just must pounce on the fish of grasping and return, yet present fishing tool can not be realized this function.

At fishing tool after salvaging runs into jam, can not withdraw from this defective of fish automatically, the correlative study mechanism of oil-gas mining instrument and manufacturer have also carried out a large amount of research and development, " petroleum machinery " 1989 08 phases disclosed " structural principle and the use of reversible back-off dipper " (author: summer Yunzhi) for example, this technology belongs to outer vatman's tool, combines the strong point that can move back dipper, slips dipper.Chinese patent literature also discloses a kind of name and has been called " high angle hole reversible slips fishing spear " (publication number: CN 2721861Y, open day: on August 31st, 2005), it designs at high angle hole, solved salvage run into jam after, withdraw from this defective of fish automatically.

Though above-mentioned two technology all solved salvage run into jam after, withdraw from this technical barrier of fish automatically, they can't at the top and around be coated with the fish of wire barrier and salvage; Moreover their structure also is different from the utility model.

Summary of the invention

The purpose of this utility model is: at above-mentioned the deficiencies in the prior art, provide a kind of can avoid TOF and around be coated with the wire barrier and the spirally-guided reversible of salvaging fish drags for lance, it can withdraw from automatically after salvaging is hampered and pounce on the fish that catches, makes to drag for lance and withdraw from well smoothly.

Mentality of designing of the present utility model is: there is under the situation of a large amount of rounds or irregularity wire barrier slowly the swinging head string in top of fish top and transfers in well, make the wire overcover under the effect of the utility model axial force, produce radial load, make the wire overcover to around scatter, the utility model enters fish chamber endoporus smoothly and salvages fish, the obstruction of its both penetrable wire overcover, if exist under the situation of a large amount of irregular wire barriers and also can stir the wire barrier, the wire barrier is bundled on the utility model takes it out of, tubing string under the free state of also can holding or card tubing string also can be by its different job requirements and safety joints, top jar, accelerator, pipe cutter, casing section mills etc. are used in combination.

The concrete technical scheme that the utility model adopts is:

A kind of spirally-guided reversible drags for lance, comprises clip, mandrel and slips, and slips is located at the mandrel outside, and the bottom of described mandrel is a guide shoe, and the diameter of this guide shoe dwindles from top to bottom gradually, is cone structure, is provided with the screw thread gathering sill on guide shoe; The mandrel of described slips below is provided with limited step.

The bottom face of described mandrel is provided with hydrophthalmia.

The excircle of described slips is provided with saw-tooth thread.

The upper end of described mandrel and slips through clamp connection on positive and negative wire connection head.

Described positive and negative wire connection head connects by the trapezoidal joint of twin-stage and draws tube or casing section mill, operation together.

The beneficial effects of the utility model are: at the top and around be coated with the fish of wire barrier and salvage, make the wire barrier under the ordering about of axial force, be converted into radial load and separate, finally make and drag for lance and arrive the fish chamber smoothly, with its salvaging, this has reduced and uses outer hook to the removing of steel wire salvaging and drilling tool repeatedly, has saved a large amount of manpowers and material resources; It can withdraw from automatically and pounce on the fish that catches after salvaging is hampered, and makes to drag for lance and withdraw from well smoothly.Characteristics such as it has that junk easily withdraws from, simple in structure, flexible operation, concertedness is good, job success ratio is high, not fragile top of fish, tension load height, big, the capable of circulation flushing top of fish of anti-shock loading, cost are low.

Description of drawings

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.

Fig. 2 is the utility model parts-positive and negative wire connection header structure schematic diagram.

Fig. 3 is a kind of user mode schematic diagram of the present utility model.

Code name implication among the figure: 1-clip; The 2-slips; The 3-guide shoe; The 4-limited step; The 5-mandrel; The 6-hydrophthalmia; The positive and negative wire connection head of 7-; The trapezoidal joint of 8-twin-stage; 9-draws tube.

The specific embodiment

Referring to Fig. 1, Fig. 2 and Fig. 3: top of the present utility model is drilling rod or tubing thread, links to each other with the utility model or tubing string, and positive and negative button sign groove is arranged on drilling rod or the tubing thread.The utility model comprises clip 1, mandrel 5 and slips 2, and slips 2 is located at mandrel 5 outsides for circular configuration, and the bottom of mandrel 5 is a guide shoe 3, the diameter of this guide shoe 3 dwindles from top to bottom gradually, be cone structure, the obtuse angle structure that it is original changes acuter angles into, is provided with the screw thread gathering sill on guide shoe 3.The mandrel 5 of slips 2 belows is provided with limited step 4, and the bottom face of mandrel 5 is provided with flushable top of fish and carries out the hydrophthalmia 6 of mud circulation.The upper end of mandrel 5 and slips 2 is connected in the positive and negative wire connection 7 through clip 1, and positive and negative wire connection 7 connects by the trapezoidal joint 8 of twin-stage and draws tube 9 operations together, and this draws tube 9 and can also be replaced by casing section mill.

Operating principle of the present utility model is: (1) is generally dragged for lance and will be rotated after going into fish and drag for lance and make slips enter duty, can't enter the salvaging state but block slips when often having a large amount of overcover at the top of fish place, might fall into a dilemma.But the design of originally dragging for lance be better than other drag for lance focus on drag for lance front end guide shoe 3 and be designed to screw thread gathering sill structure, can be used for sweeping out the overburden on the top of fish, so slips 2 can be put in the salvaging position when transferring the pipe string is lowered to, swinging head string when running into overcover, slips 2 can not rotate, and can be salvaged directly into fish in case overcover pushes aside.Generally dragging for of also can being told forward enters the salvaging state after the such grade of lance is gone into fish again; The external diameter of slips 2 is slightly larger than the fish internal diameter when (2) salvaging, and when originally dragging for lance and enter the fish chamber, slips 2 is compressed, and produces certain outer expansion force, makes slips 2 be adjacent to the fish inwall.Up and lift the increase gradually of power with mandrel 5, the saw-tooth thread on the slips 2 is fitted with the fish inwall, and slips 2 produces radial loads, makes it bite fish and realizes salvaging; (3) in case the direct upper lifting pipe post of engaging fish get final product; (4) in case fish is stuck, can't pull out and need withdraw from when dragging for lance, make it get back to normal position can easily to withdraw from fish as long as transfer mandrel 5 swinging head strings; (5) wait that proposing originally to drag for lance maintains, and selects a good opportunity and salvages once more.

Claims (5)

1. a spirally-guided reversible drags for lance, comprise clip (1), mandrel (5) and slips (2), slips (2) is located at mandrel (5) outside, it is characterized in that: the bottom of described mandrel (5) is guide shoe (3), the diameter of this guide shoe (3) dwindles from top to bottom gradually, be cone structure, on guide shoe (3), be provided with the screw thread gathering sill; The mandrel (5) of described slips (2) below is provided with limited step (4).

2. spirally-guided reversible according to claim 1 drags for lance, it is characterized in that: the bottom face of described mandrel (5) is provided with hydrophthalmia (6).

3. spirally-guided reversible according to claim 1 drags for lance, it is characterized in that: the excircle of described slips (2) is provided with saw-tooth thread.

4. spirally-guided reversible according to claim 1 drags for lance, it is characterized in that: the upper end of described mandrel (5) and slips (2) is connected on the positive and negative wire connection head (7) through clip (1).

5. spirally-guided reversible according to claim 4 drags for lance, it is characterized in that: described positive and negative wire connection head (7) connects by the trapezoidal joint of twin-stage (8) and draws tube (9) or casing section mill, operation together.

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