CN205189797U - Open hole anchoring device - Google Patents

Abstract

The utility model provides a neotype open hole anchoring device adopts the slab bridge sub -assembly as the anchoring component, and increase and wall of a well area of contact had not only ensured that the anchoring was done all can but also the non -maleficence wall of a well. The vibration of adopting the folding spring of damping to subduct the tubular column prolonged when time effective anchoring time. Utilize rotatory lock tube, one -way catch, it is smooth that tie and the extension spring can be in once going into the well, - - - keeping the anchoring - - - changes in removing several kinds of states of anchoring conveniently to sit the anchor, has ensured the flexibility that open hole anchoring device used to the nimble various construction requirements and the unexpected condition deald with of constructor, rotatory lock tube can ensure the reliability of sitting the anchor each time according to pit shaft size location.

Description

Open hole well anchor

Technical field:

The utility model belongs to the downhole tool that petroleum gas exploits (comprising shale gas, coal bed gas) open hole well completion and makes field, is specifically related to a kind of anchor operating tool string, flow string being anchored to the open hole well borehole wall.

Background technology:

In many operations of open hole well, in order to ensure smooth construction, protecting packer and tubing string, need tubing string to be anchored on the open hole well borehole wall.For cased well, usually utilize hydraulic anchor or slips tubing string can be anchored on the cased well borehole wall.But for open hole well, because the annular space of tubing string and the open hole well borehole wall is comparatively large, its intensity of the rock of the open hole well borehole wall and toughness cannot compared with the steel of sleeve pipe, so existing hydraulic anchor or slips are all inapplicable." a kind of righting anchoring device being applied to horizontal bare hole well " given by utility model patent 2012206124574, there is following shortcoming in actual applications: 1, crab-bolt and borehole wall contact area too little, excessive to rock of borehole local pressure, cause the injury of the borehole wall.2, owing to not having vibration reducing measure, the vibration of tubing string directly acts on the borehole wall, makes the borehole wall destroy rapidly as hammer drill.Thus, the reliability of performance does not reach application requirement.The method of 3, disanchoring, adopt pitching to unlock lift to disanchor, implement cumbersome, ball that size is suitable and corresponding ball seat be selected, and their size will match with the pitching ball seat needed for whole other instrument of string tubing string; Lift tubing string relates to whole string tubing string is lifted out well and problem of again going into the well, and engineering quantity is very large.4,---chance of disanchoring, can not realize repeatedly sitting anchor---is disanchored, and is needed transformation state flexibly and easily in field use in once the entering down of tubing string, for once to sit anchor, as:

Thus, the flexibility of operation does not reach application requirement yet.

Utility model content:

The utility model is for existing product in practicality, and reliability and operating flexibility all do not reach the situation that field use requires, propose a kind of design being different from any one anchoring device in the past.Its concrete technical scheme is:

Open hole well anchor described in the utility model, by central tube 16, top connection 17, lower contact 1, hydraulic cylinder 14, piston 8, extension spring 15, slab bridge composite member: slab bridge 6, bridge post 4, bearing pin 5, vibration damping fold spring 3, rotate lock tube 10, ball 11, retainer 9, unidirectional lock ring 12, thrust ring 13, overcoat 2 form.

Described slab bridge composite member is the anchoring element of this anchor, does not adopt anchor post, slips, hinge.It is made up of 1 piece of bridge plate 6 and 4 (or more than 4) bridge posts 4, be connected by bearing pin 5 between bridge post, matsurface is processed into above bridge plate, it is made to improve with the frictional resistance of rock but not injure the borehole wall, the both sides of bridge plate are provided with shirt rim, shirt rim is respectively outputed two elongated slots, first and the 3rd bearing pin penetrate wherein and can slide wherein, head end and the tail end of bridge post all leave through hole.

Adopt vibration damping to fold the vibration that tubing string cut down by spring 3, alleviate the destruction of bridge plate to rock.One end of folding spring is processed into strip, to penetrate the through hole of bridge post.

The leading portion of described piston 8 is extension diameter sections, in order that splendid attire control to rotate lock tube 10, the front end of piston connects equal power ring 7, the effect of equal power ring be transmit piston slide force and fixing vibration damping folds spring, have sand block effect concurrently simultaneously.The rear end of piston connects extension spring 15, and during central tube pressurization, piston moves ahead and stretches out, and when central tube stops pressure, piston retreats retraction under extension spring effect.

Rotating lock tube 10 is that outer rim is with continuous length groove, ball, the rotatable moveable endless means again in lock ring chamber is left in inside, and it coordinates with unidirectional lock ring 12, thrust ring 13 and retainer 9, can form several functions: when piston stretches out, retainer arrives at the top dead centre of elongated slot, promote slab bridge composite member protuberance, when piston continues to stretch out, driven rotary lock tube moves ahead by retainer simultaneously, until the bridge plate contact borehole wall, till anchoring states, now, rotate lock tube and rest on appropriate location.If stop pressurization, retainer slips into short groove, and piston can not retreat, and still keeps anchoring states.As removed anchoring states, need only again pressurize, stop pressure, retainer slips into elongated slot, and piston retreats retraction under extension spring effect, pulls bridge post, and slab bridge composite member recovers installment state.Grappling next time, this anchor can according to borehole wall abrasion condition, and adjustment rotates lock tube position (such as move ahead 5mm) automatically, and it is all reliable for this guarantees each grappling.

From above description, the open hole well anchor that the utility model provides, operation is easily, no matter be grappling, keep grappling, remove grappling, all need only hydraulic control, State Transferring is relatively more flexible, is convenient to tackle the fortuitous event in construction, reaches in background technology by the state that the field use that block diagram is described is hoped.

Further illustrate below by way of accompanying drawing.

Accompanying drawing illustrates:

Fig. 1 is the utility model mechanical schematic diagram (sealing ring omits and do not mark).

Fig. 2 is length groove plane outspread drawing.

Fig. 3 is slab bridge composite member assembling schematic diagram, and 3a installs state, and 3b is protuberance state.

In figure: 1 lower contact, 2 overcoats, 3 vibration dampings fold spring, 4 bridge posts, 5 bearing pins, 6 bridge plates, 7 equal power rings, 8 pistons, 9 retainers, and 10 rotate lock tube, 11 balls, 12 unidirectional lock rings, 13 thrust rings, 14 hydraulic cylinders, 15 extension springs, 16 central tubes, 17 top connections.

Wherein, overcoat 2 leaves strip gap, to install bridge plate 6.One end that vibration damping folds spring 3 is screwed with on equal power ring 7 in lower contact 1, and the other end links on bridge post 4.Central tube 16 is provided with extraordinary thread segment, match with the extraordinary screw thread on unidirectional lock ring 12, make unidirectional lock ring can only accept a direction thrust, to beat in continuous folding advance, when being subject to other direction thrust, when especially acting on the conical surface of lock ring with the conical surface, lock ring will hug on central tube, in lock-out state.

The rear end of piston 8 is connected with extension spring 15, and concrete method of attachment is: output helicla flute at piston rear end, makes extension spring screw in wherein 1-2 circle, then to weld location.

The extension spring other end is connected with hydraulic cylinder 14, and concrete method of attachment is: on the inner headed face of hydraulic cylinder bottom, reserve spiral protrusion, and after piston loads hydraulic cylinder, with the extension spring of instrument tractive, rotating liquid cylinder pressure, makes extension spring enter in spiral protrusion.

Specific embodiment:

The present embodiment provides one and is applicable to 6-7, and " anchor of open hole well acid fracturing operation; its firm footpath φ 140mm; interior latus rectum φ 72mm; serviceability temperature≤220 DEG C; single hydraulic control can realize repeatedly grappling, keeps grappling and remove the various states of grappling and mutually change arbitrarily in once going into the well.

Assembling process is: extension spring 15 screwed in the helicla flute of piston 8 outer rim, make it fix with argon arc welding, upper sealing ring.Piston 8 is loaded hydraulic cylinder 14, tractive extension spring, rotating liquid cylinder pressure, make extension spring enter spiral protrusion in hydraulic cylinder.

On central tube 16, be inserted in thrust ring 13, unidirectional lock ring 12, rotate lock tube 10, thrust ring is screwed in lock tube.

Central tube is inserted hydraulic cylinder 14, when central tube step is stuck in hydraulic cylinder bottom surface, load onto joint 17.

Dress retainer 9.With screw, vibration damping is folded spring 3 to be fixed in lower contact 1, to be fixed on equal power ring 7.With screw, equal power ring is fixed on piston.

Dress overcoat 2, the vibration damping on the equal power ring of adjustment gap position alignment folds spring.

Load joint 1, adjustment vibration damping folds spring and aims at gap.

Bridge plate 6, bridge post 4 and bearing pin 5 are assembled into slab bridge composite member.

Finally slab bridge composite member and vibration damping are folded spring to link, load gap.

Start shear pin can establish on the coat, particular location can be located at and just block equal power ring place.

The theory of mechanics of this anchor can be checked, State Transferring and corresponding qualitative performance in laboratory.

This anchor bridge plate thickness 7mm, length 150mm, bridge column length 45mm.If the definition bridge post elevation angle is bridge post and axis angle, the outer contour that bridge plate face reaches is bridge plate outer rim, and so the association change in size of slab bridge composite member is:

Piston stretches out (mm)	0	48	84
				Bridge plate outer rim (mm)	135	170	185
Bridge post span (mm)	168	120	86
				The bridge post elevation angle (°)	20	47	63

Form above illustrates: during installation, bridge post has an initial elevation 20 °, and bridge post initial range is 168mm, and bridge plate face is lower than rigid body outer rim.When piston stretches out 48mm, the bridge post elevation angle increases to 47 °, and bridge plate outer rim reaches 170mm, and bridge post span narrows down to 120mm, and when piston stretches out 86mm, the bridge post elevation angle increases to 63 °, and bridge plate outer rim reaches 185mm, and bridge post span narrows down to 86mm.

Claims (5)

1. a novel open hole well anchor, by central tube (16), top connection (17), lower contact (1), hydraulic cylinder (14), piston (8), extension spring (15), slab bridge composite member: bridge plate (6), bridge post (4), bearing pin (5), vibration damping folds spring (3), rotates lock tube (10), ball (11), retainer (9), unidirectional lock ring (12), thrust ring (13) and overcoat (2) composition, wherein based on central tube, piston and hydraulic cylinder promote bridge plate composite member protuberance by hydraulic action.

2. open hole well anchor according to claim 1, is characterized in that, described slab bridge composite member is the anchoring element of this anchor, and it is made up of 1 piece of bridge plate (6) and 4 bridge posts (4), has bearing pin between bridge post

(5) be connected, be processed into matsurface above bridge plate, bridge plate both sides are provided with shirt rim, it are respectively outputed two elongated slots, and bearing pin interts wherein and can slide wherein.

3. open hole well anchor according to claim 1, is characterized in that, described vibration damping folds spring (3) and is arranged on bridge post two ends.

4. open hole well anchor according to claim 1, it is characterized in that, described rotation lock tube (10) outer rim is provided with continuous length groove, and retainer (9) can be slided wherein, under piston (8) slide force effect, be positioned short groove or elongated slot stop; Lock ring chamber is left so as to controlling unidirectional lock ring (12) in the inner edge rotating lock tube (10).

5. open hole well anchor according to claim 1, is characterized in that, described piston (8) provides retraction force by extension spring (15).