CN2929164Y - Fishable cement transfer device for branch well and horizontal well - Google Patents

Abstract

The utility model relates to a salvageable cement retainer for a branching well and a horizontal well, belonging to the well fixing device for the branching well and the horizontal well. The utility model applies the structure that comprises an upper connector center tube, a cylinder liner and a fishing pipe for an outer thimble, a tee is arranged in the center tube, the upper end of the spheroid and the tee is provided with a conical sealing surface matching with the spheroid and the axial direction of the tee is provided with an elongated slot, a limiting dowel is clamped in the elongated slot at the lower portion of the center tube, a caulking ring, a rubber cylinder and a limit ring are arranged on the surfaces of the fishing pipe and the sliding bush. The application of the utility model can protect the cement from polluting the upper reservoirs when the cement is squeezed and after the cement is squeezed, the well doesn't need to be closed to wait for the solidification and no bridging plug needs to be drilled, but to salvage the well casing after the work. The utility has the advantages of a simple structure and a convenient operation that can be applied in the workover treatment of the branching well and the horizontal well in oil fields.

Description

A kind of salvagable cement carry-over apparatus that is used for Multilateral Wells, horizontal well

Technical field:

The utility model relates to a kind of salvagable cement carry-over apparatus that is used for Multilateral Wells, horizontal well, belongs to Multilateral Wells, horizontal cementing device class.

Background technology:

The oil field is in well workover formation testing operation, need in oil well, clamp-on the cement leak stopping, seal and scurry or well cementation again, ordinary production for old well, the notes in new well formation testing and oil field are adopted all significant, squeeze method shutoff widespread usage in the existing technology, can bore bridging plug formula and drillable cement retainer, use above-mentioned instrument to carry out job execution, technology is comparatively simple, but risk is very big, pollutes the top oil reservoir again easily, and squeezes back cement and need wait with fixed attention by closing well, can cause long shortcoming duty cycle, above-mentioned in addition technology also can only be carried out in the less oil well of straight well or hole deviation.

The utility model content:

The purpose of this utility model is in order to overcome above-mentioned shortcoming; and a kind of salvagable cement carry-over apparatus that is used for Multilateral Wells, horizontal well that provides; this instrument can protect the top oil reservoir not contaminated in Multilateral Wells, horizontal well cement squeeze work process; wait with fixed attention without closing well behind the squeeze method, without drilling out.

The utility model implementation is such.

For the utility model that achieves the above object by top connection by the cylinder sleeve that is threaded and cylinder sleeve lower end with central tube that is threaded and the outer sleeve on the fluid cylinder external surface and salvage pipe and form, in described central tube, be provided with ball seat, the conical seal (contact) face that the ball seat upper end has spheroid to cooperate, axially have 2-4 elongated slot at the ball seat lower end edge, central tube has a position-limitting pin to be stuck in the elongated slot bottom.

Position, described salvaging pipe its underpart has one to be fixed at sliding sleeve and with shear pin, is set with split ring, spacer ring, packing element, cone, slips, catch retainer ring, lower rubber cylinder and packing element baffle ring from top to bottom salvaging pipe and sliding sleeve external surface.

The inner surface of described split ring has the gingival cyst of mucous gland in the newborn screw thread and matches with the gingival cyst of mucous gland in the newborn button of salvaging pipe upper end external surface.

The utility model working method is:

During the utility model work, top connection is connected with drilling rod or oil pipe by screw thread, pressurize in well on ground, fluid cylinder drives central tube under pressure and moves up, since central tube with salvage pipe and salvage manage with sliding sleeve between all be connected by shear pin, therefore, when central tube upwards moves in pit shaft, can drive that sliding sleeve moves up and sliding sleeve drives and moves on the packing element baffle ring, the packing element that is positioned at the device bottom is outwards expanded, and the promotion catch moves upward, be positioned at catch retainer ring on the catch and drive catch and slips along moving on the cone, make the slips distending, till being stuck on the internal surface of sleeve pipe, when continuing to be forced into 15MPa then, the shear pin of top is cut off, move on continuing after central tube and salvaging pipe are broken away from, when pressure reaches 20MPa, middle shear pin is also cut off, the interior release of device this moment, make ball seat descending and be stuck on the position-limitting pin of central tube bottom, at this moment, beginning just can be carried out cementing job, cement paste is after release, passage between ball seat and the central tube flows into downwards, after opening one way valve, cement paste enters in the pit shaft from the spring base through hole again, this the packing element that is arranged in the bottom is played stop on the pit shaft cement paste and return the slips place, can't carry out deblocking after preventing to cause slips to be fixed, after treating that cementing job is finished, the upper lifting pipe post, with fluid cylinder, cylinder sleeve, central tube, outer sleeve proposes pit shaft, being lowered to reversible then drags for and gives, make and drag for the lance slips on the salvaging inside pipe wall, the upper lifting pipe post is cut off the bottom shear pin, at this moment, it is up again to salvage the moving split ring of pipe racks, with the packing element and the slips deblocking of distending,, salvage the sliding sleeve and the packing element of the moving down-hole of pipe racks when sliding pin runs on the sliding sleeve groove behind the summit, the component of slips and down-hole are salvaged pit shaft together.

The utility model compared with prior art has distinguishing feature:

Because this device has adopted the structure that the cylinder sleeve that connected by top connection and central tube, outer sleeve, fishing socket form and be provided with ball seat in central tube; and there are banking pin and fixing salvaging pipe, split ring, spacer ring, the upper and lower packing element of shear pin in the central tube lower end; in being lowered to horizontal well, Multilateral Wells, carry out cement squeeze work; wait with fixed attention also without drilling out without closing well after the completion; directly instrument being salvaged pit shaft gets final product; can protect the upper wellbore oil reservoir not contaminated like this; can shorten oil well duty cycle again, very convenient.

Description of drawings:

Accompanying drawing is this practical new construction schematic diagram.

Among the figure by 1, top connection, 2, trip bolt, 3, " O " type circle, 4, cylinder sleeve, 5, fluid cylinder, 7, outer sleeve, 8, central tube, 9, shear pin, 10, spheroid, 11, salvage pipe, 13, ball seat, 15 split rings, 16, spacer ring, 17, packing element, 19, position-limitting pin, 20, cone, 21, slips, 22, slips screw, 23, the slips catch, 24, sliding pin, 26, the catch retainer ring, 27, sliding sleeve, 29, unidirectional valve pocket, 30, packing element baffle ring, 32, spring, 33, spring base, 34, spool forms.

The specific embodiment:

The utility model is provided by following examples, is illustrated below in conjunction with accompanying drawing.

Among the figure, this device is tubular structure, and top connection 1 upper end is drilling rod or tubing thread, and the lower end is connected with cylinder sleeve 4 by screw thread, and trip bolt 2 plays the effect that prevents that top connection and cylinder sleeve 4 from threading off.Insert in the top connection 1 fluid cylinder 5 upper ends, seal by O RunddichtringO 3 between them, and fluid cylinder 5 external surfaces can slide realization hydraulic pressure power transmission effect at top connection inner surface, cylinder sleeve 4 inner surfaces.The lower end of fluid cylinder 5 is threaded with central tube 8, and cylinder sleeve 4 lower end inner surfaces are enclosed within on the central tube 8 upper end external surfaces simultaneously, and between the two equally by 3 sealings of O RunddichtringO, and central tube 8 can upwards slide along cylinder sleeve 4 lower end inner surfaces under fluid cylinder 5 drives.Outer sleeve 7 upper ends be enclosed within cylinder sleeve 4 lower end external surfaces on, connect by trip bolt 2 between the two, prevent the outer sleeve slippage.Design has ball seat 13 in the central tube, the design of ball seat 13 upper ends has the conical seal (contact) face that cooperates with spheroid 10, and be connected with central tube 8 lower ends by shear pin 19, ball seat 13 lower end edges axially have 2 or 4 elongated slots, the elongated slot top is the arc face, central tube position-limitting pin 19 bottom just is stuck among the elongated slot, cut off shear pin 9 when suppressing, after central tube moves down certain distance, this moment, elongated slot nose-circle cambered surface just was stuck on the position-limitting pin 19, make central tube 8 can not continue to influence the operate as normal of one way valve to lower slider.Between central tube and outer sleeve 7, manage 11 for salvaging, salvaging pipe 11 upper ends is connected with central tube 8 by shear pin 9, the lower end is provided with sliding pin 24 and shear pin 9, sliding pin 24 ends stretch in the axial elongated slot that sliding sleeve 27 external surfaces are provided with, salvage pipe 11 lower ends and be enclosed within sliding sleeve 27 upper ends, and be fixed by shear pin 19.And salvage pipe 11 and sliding sleeve 27 outsides from top to bottom suit the fixing slips 21 of split ring 15, spacer ring 16, upper and lower packing element 17 and packing element baffle ring 30, cone 20, slips screw 22, slips catch 23, catch retainer ring 26 and packing element baffle ring 30.Split ring 15 inner surfaces are the gingival cyst of mucous gland in the newborn button, cooperate with the gingival cyst of mucous gland in the newborn button of salvaging pipe 11 upper end external surfaces, only allow to move on the split ring, and can not rollback, thereby can prevent that upper and lower packing element distending from occurring moving down the deblocking phenomenon again after slips tightens.Slips 21 is a block structure, 4 slip segments of circumference uniform distribution, and slips 21 and catch retainer ring 26 are coupled together by slips screw 22 with 4 catch.Cone 20 moves down and can make slips 21 outer expanding, and is stuck on the internal surface of sleeve pipe.Being connected with the one way valve external screw thread by internal thread bottom of sliding sleeve 27, constituted one way valve by unidirectional valve pocket 29, spring 32, spring base 33 and spool 34.Fluid is by pipe in the salvagable cement carry-over apparatus, and when flowing into one way valve, spring 32 is compressed under the fluid action of gravity, and spool 34 moves downward, and this moment, fluid flowed in the pit shaft by annular space between spool 34 and the unidirectional valve pocket 29 and the through hole on the spring base 33.

Claims (2)

1, a kind of salvagable cement carry-over apparatus that is used for Multilateral Wells, horizontal well, by top connection (1) by the cylinder sleeve (4) that is threaded and fluid cylinder cover (5) lower end with central tube (8) that is threaded and the outer sleeve (7) on cylinder sleeve (4) external surface and salvage and manage (11) and form; It is characterized in that: be provided with ball seat (13) in the described central tube (8), and there is the conical seal (contact) face of spheroid cooperation the ball seat upper end, axially have 2-4 elongated slot at the ball seat lower end edge, there is a sliding sleeve (27) its described salvaging pipe (11) lower end, and be fixed with shear pin (9), be set with split ring (15), spacer ring (16), packing element (17), cone (20), slips (21), catch retainer ring (26) and packing element baffle ring (30) from top to bottom salvaging pipe (11) and sliding sleeve external surface.

2, a kind of salvagable cement carry-over apparatus that is used for Multilateral Wells, horizontal well according to claim 1 is characterized in that: the inner surface of described split ring (15) has the gingival cyst of mucous gland in the newborn screw thread and matches with the gingival cyst of mucous gland in the newborn button of salvaging pipe (11) upper end external surface.

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