CN102900385A - Over-clamping distance steel wire operation slip plug - Google Patents

Abstract

The invention relates to a slip plug special for over-clamping distance steel wire operation in oil extraction injection well under-pressure operation. The blanking plug comprises a fishing cap and a fixed supporting seat, wherein the fishing cap is connected with a central rod, and the outer wall of the central rod is sequentially sleeved with a positioning supporting seat, a locking ring outer cylinder, a slip upper seat, a slip and a slip lower seat; the lower side of the slip lower seat is provided with two rubber cylinder sheaths and a supporting seat; an outer rubber cylinder and an inner rubber cylinder are arranged between the two rubber cylinder sheaths. The outer diameter of the plug is smaller than the inner diameter of an eccentric water distributor used by a water injection well, the plug can realize tail pipe plugging through a clamping distance section under the conditions that the original well pipe column is seriously scaled and the drift diameter is reduced, and the internal plugging of the part below a tubing coupling with the specified depth can be realized by performing mechanical shock operation on the plug through a steel wire operation tool string underground.

Description

Cross card apart from steel wire operation slips blanking plug

Technical field

Crossing of water injection well Operating Pressure special use blocked apart from the tail pipe capping tools in the present invention relates to recover the oil, and a kind of card of crossing is apart from steel wire operation slips blanking plug specifically.

Background technology

In the water injection well in oil fields Operating Pressure, need to carry out the inner shutoff of oil pipe apart from section with below the card distance section to former well tubing clamp.The general eccentric injection mandrel minimum diameter of water injection well in oil fields is 46mm, and existing capping tools is bigger than normal because of the fouling endoporus of the relatively former well casing post of external diameter, therefore can not realize that card was apart from shutoff.

Summary of the invention

In order to address the above problem, the invention provides a kind of card of crossing apart from steel wire operation slips blanking plug.The eccentric injection mandrel internal diameter that this blanking plug external diameter uses less than water injection well, can pass through card and realize a tail pipe shutoff apart from section, by the steel wire operation tool string it be carried out mechanical jarring in the down-hole and operate the inside shutoff that can realize at the following position of designated depth tubing coupling.

Technical scheme of the present invention is: a kind of card of crossing comprises and drags for cap and fixed supporting seat apart from steel wire operation slips blanking plug, the described cap connection center-pole that drags for, and the center-pole outer wall is set with lower of positioning supports seat, lock ring urceolus, the slips seat of honour, slips and slips successively; The lower bottom of described slips is two packing element sheath and supporting seats; Be equipped with outer packing element and interior packing element between described two packing element sheaths.

The upper surface of described positioning supports seat connects torsionspring and positioning support support claw by cottor pin; The ring cavity of described center-pole and lock ring urceolus is built-in with the lock ring spring and pushes down lock ring, and it is withstood on the slips seat of honour; Described slips circumferentially distributes around center-pole, fixed by the slips fixing spring, and lower of the upper and lower side of slips and slips seat of honour slips contacts for the conical surface; Described outer packing element and interior packing element are two groups up and down, and the centre is separated by spacer ring.

The invention has the beneficial effects as follows: since said structure cross card apart from the diameter of the steel wire operation slips blanking plug external diameter less than existing blanking plug, can it can be smoothly fouling endoporus by tail pipe card distance, lower mistake is sat in advance card position tail pipe is better stopped up, made card apart from shutoff success rate 94.8%, seal and pressure bearing 21MPa, operating temperature is normal temperature ~ 120 ℃; Obtain sufficient checking in using at the scene, obtained good result of use.

Description of drawings

Fig. 1 is structural representation of the present invention.

1-drags for cap among the figure, 2-limited screw, 3-center-pole, 4-positioning support support claw, the 5-torsionspring, 6-positioning supports seat, 7-lock ring spring, 8-lock ring, 9-lock ring urceolus, the 10-slips seat of honour, 11-slips fixing spring, the 12-slips, lower of 13-slips, 14-packing element sheath, the 15-glue tube base, the outer packing element of 16-, packing element in the 17-, the 18-spacer ring, 19-supporting seat, 20-limited screw.

The specific embodiment

The invention will be further described below in conjunction with accompanying drawing:

By shown in Figure 1, this crosses card apart from steel wire operation slips blanking plug, comprise and drag for cap 1 and fixed supportingseat 19, described cap 1 center-pole 3 that is threaded that drags for, and will drag for cap 3 bylimited screw 2 and be limited on the center-pole 3, center-pole 3 outer walls are set with lower 13 of positioning supports seat 6,lock ring urceolus 9, the slips seat ofhonour 10,slips 12 and slips successively, wherein are between positioning supports seat 6,lock ring urceolus 9, the slips seat ofhonour 10 to be threaded; Lower 13 bottoms of described slips are that twopacking element sheaths 14 reach the supportingseat 19 that is connected with center-pole 3 end thread; 14 of described two packing element sheaths are equipped withouter packing element 16 and interior packing element 17.And the external diameter of this blanking plug can be smoothly by the fouling endoporus of card distance less than the fouling endoporus of former well casing post, and lower mistake is sat in advance card position tail pipe is better stopped up.

The upper surface of described positioning supports seat 6 connects torsionspring 5 and positioning support support claw 4 by cottor pin, and positioning support support claw 4 can rotate take cottor pin as axle, and the power that torsionspring 5 is outwards opened positioning support support claw 4 makes in its annular groove that is stuck in box cupling.

The ring cavity of described center-pole 3 andlock ring urceolus 9 is built-in with somelock rings 8 and embraces center-pole 3, and lock ring spring 7 is also pushed downlock ring 8, and it is withstood on the slips seat ofhonour 10.

Describedslips 12 is some, and circumferentially distributes around center-pole 3, and is circumferentially fixing by slips fixing spring 11, and lower 13 of the upper and lower side ofslips 12 and the slips seat ofhonour 10 and slips contact for theconical surface.Slips 12 is 4 in the present embodiment, and lower 13 of slips,packing element sheath 14,glue tube base 15,outer packing element 16,interior packing element 17 be enclosed within on the center-pole 3, can axially be free to slide along center-pole 3.

Describedouter packing element 16 andinterior packing element 17 are two groups up and down, middlely separated byspacer ring 18, and twoouter packing elements 16 place in twoglue tube bases 15, andglue tube base 15 places in thepacking element sheath 14.

When going into the well, to cross card with steel wire operation running tool string first carried on steel wire operation slips blanking plug descends after the pre-seat card position, its positioning support support claw 4 is positioned in the annular groove of box cupling, realizes initial alignment, repeatedly hit down the slips blanking plug by running tool again and drag for cap, makeslips 12 distendings prop up tube inner wall, realize slips anchoring, squeeze simultaneously swollen packing element (16,17) and realize shutoff, at this moment, the lock ring spring 7 on the center-pole 3, lockring 8, lockring urceolus 9 and the slips seat ofhonour 10 will keep it to set state.Hit under the steel wire operation tool string and make the running tool string and drag for cap and separate, trip out the running tool string, finish setting.After oil pipe plays ground, be rotated counterclockwise fishing head, can unfreezing from oil pipe, take out blanking plug.

Because the eccentric injection mandrel internal diameter that this blanking plug external diameter of this blanking plug uses less than water injection well, serious in the fouling of former well casing post, also can realize the tail pipe shutoff apart from section by card in the situation that latus rectum reduces, by the steel wire operation tool string it is carried out mechanical jarring in the down-hole and operate the inside shutoff that can realize at the following position of designated depth tubing coupling, made card apart from shutoff success rate 94.8%, seal and pressure bearing 21MPa, operating temperature is normal temperature ~ 120 ℃; Obtain sufficient checking in using at the scene, obtained good result of use.

Claims (5)

1. cross card apart from steel wire operation slips blanking plug for one kind, comprise and drag for cap (1) and fixed supporting seat (19), it is characterized in that: the described cap (1) that drags for connects center-pole (3), and center-pole (3) outer wall is set with positioning supports seat (6), lock ring urceolus (9), the slips seat of honour (10), slips (12) and lower of slips (13) successively; Lower (13) bottom of described slips is two packing element sheaths (14) and supporting seat (19); Be equipped with outer packing element (16) and interior packing element (17) between described two packing element sheaths (14).

2. the card of crossing according to claim 1 is apart from steel wire operation slips blanking plug, and it is characterized in that: the upper surface of described positioning supports seat (6) connects torsionspring (5) and positioning support support claw (4) by cottor pin.

3. the card of crossing according to claim 1 is characterized in that apart from steel wire operation slips blanking plug: described center-pole (3) is built-in with lock ring spring (7) and pushes down lock ring (8) with the ring cavity of lock ring urceolus (9), and it is withstood on the slips seat of honour (10).

4. the card of crossing according to claim 1 is apart from steel wire operation slips blanking plug, it is characterized in that: described slips (12) circumferentially distributes around center-pole (3), fixing by slips fixing spring (11), and the upper and lower side of slips (12) contacts for the conical surface with the slips seat of honour (10) and slips lower (13).

5. the card of crossing according to claim 1 is characterized in that apart from steel wire operation slips blanking plug: described outer packing element (16) and interior packing element (17) are two groups up and down, and the centre is separated by spacer ring (18).

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