CN2135644Y - Automatic liquid feeding telescopic floating hoop - Google Patents

Abstract

The utility model relates to an automatic liquid filling type bushing floating hoop in the process that a bushing is arranged after well drilling is finished in an oilfield. The problem that well liquid needs to be stopped to be filled in the bushing in the process that the bushing is arranged is solved. An inner sliding sleeve 8 is arranged inside a short connecting outer shell 1 which is connected with a lower part bushing in series. A positioning cutting pin 4, a clamping spring ring 5, an annular cavity D, a clamping spring ring 5, and a positioning annular groove 10 which downwards moves to be released are arranged between the short connecting outer shell 1 and the lower part bushing. Communicating holes C and E are arranged on the wall of the inner sliding sleeve, and a blind plate 7 is welded between the two communicating holes C and E. When the bushing is arranged, the completion well fluid outside the bushing passes through a lower port to flow into a bushing cavity through the communicating holes E and C, and the pressure of an inner liquid post and an outer liquid post is balanceable. When the well is fixed, A, B, C, E, and F are accepted as the flow directions of cement pulp, and the speed of bushing arrangement can be improved.

Description

Automatic liquid feeding telescopic floating hoop

The utility model relates to a kind of oil field drilled well automatic liquid feeding type casing float collar in the setting of casing process.

After present oil gas well finishing drilling in the setting of casing process, because of the bunch tube bottom connected the float collar of single current valve effect (completion fluid can not on return) and look in guide shoe, no liquid in setting of casing process middle sleeve influences cased speed like this; For this reason, every descended will to connect behind tens sleeve pipes irritate completion fluid in the pouring pipe alignment sleeve pipe, continue setting of casing after filling again, irritate completion fluid again after following tens, owing to increased the process of irritating completion fluid, some down-hole accidents prolonged the cased activity duration, owing to may take place activity duration length.

The purpose of this utility model is to overcome shortcoming part in the above-mentioned prior art, and the automatic liquid feeding type casing float collar that provides the drilled well of a kind of oil field not need manually to irritate liquid in the setting of casing process can shorten activity duration and the generation of avoiding down-hole accident.

The purpose of this utility model can reach by the following technical programs: connect short circuit 1 on the bunch tube of bottom, inner sliding sleeve 8 is housed in the short circuit shell, discharge positioning ring groove 10 when having position shearing pin 4, jump ring ring 5, annular chamber D and jump ring ring to move down between the two, intercommunicating pore C, E are arranged on the inner sliding sleeve wall, and between two holes, be welded with blind plate 7; Convex ring body 9 is arranged at the outer casing inner wall bottom simultaneously.

Sealing ring (3,6) can be arranged between above-mentioned shell and inner sliding sleeve, and the inner sliding sleeve upper port can be welded the bruising ring.The utility model is compared above-mentioned prior art can have following effect:

1, owing to is to adopt inner sliding sleeve formula structure, in the setting of casing process, completion fluid can enter in the sleeve pipe by this float collar in the well, make the inside and outside head of liquid of sleeve pipe remain balance, like this, just can not squeeze distortion to sleeve pipe, also need not interrupt setting of casing and in sleeve pipe worn-out the pressure irritate completion fluid, can not make sleeve pipe downstream rate in well slow because of no liquid in the sleeve pipe yet.But improved the safety factor of sleeve pipe in well, and shortened the activity duration, improve setting of casing speed.

2, adopt multistage seal by elastomeric O-ring, closely do not lose efficacy, because the sealing vi have high safety, thoroughly cut off the annular space cement paste and flow backwards or be penetrated into possibility in the sleeve pipe, and cement plug returns high phenomenon after having stopped solid completion and can bear to seal greater than 20 MPa pressure.

Figure is that the utility model partly cuts open configuration diagram.

Below in conjunction with accompanying drawing will the utility model is described in further detail:

Shown in accompanying drawing, begin down the 1st with the 2nd sleeve pipe between is connected short circuit shell 1, upward for being pin thread under the box; Shell is equipped with inner sliding sleeve 8 for 1 li, top has that annular chamber D is arranged at the bottom between position shearing pin 4, jump ring ring 5 and the two (1,8) between the two (1,8), can be on outer casing inner wall, on the inner sliding sleeve wall, there are through hole C, E that D is communicated with central passage, hole more than 2 pairs can be arranged; And be welded with blind plate 7(shutoff central passage plate in the inner sliding sleeve between hole C, the E), making flow liquid is passage by hole C, E; Discharge positioning ring groove 10 when between shell and inner sliding sleeve, also having the jump ring ring to move down; Inner sliding sleeve lower limit pallet convex ring body 9 is arranged at the outer casing inner wall bottom.

Sealing ring (3,6) can be housed between above-mentioned shell 1 and the inner sliding sleeve 8, and its operating pressure was not for losing efficacy greater than 20 MPas; Bruising ring 2 in the welding of inner sliding sleeve 8 upper ends, its ring internal diameter should be less than well cementation bruising plug external diameter.Well cementation is annotated and under high pressure is pressed into plug energy shear pin 4 in the grey rear sleeve, inner sliding sleeve 8 is displaced downwardly on the inner sliding sleeve lower limit pallet convex ring body 9 along outer casing inner wall, jump ring ring 5 discharges the location with moving down on the cannelure 10, two hole C, E are sealed to be communicated with by outer casing inner wall and sealing ring 6 the outer cement paste of sleeve pipe can not be returned in the sleeve pipe.

After grey finishing annotated in well cementation, be pre-installed in the cementing head on the well head plug under pressure, be pressed in the sleeve pipe, begin for completion fluid, plug is under the completion fluid pressure-driven, descending along internal surface of sleeve pipe, in the time of in walking to float collar, plug just collides with the bruising ring, cut off its connection of liquid up and down, make the pressure of liquid in the sleeve pipe all act on the sliding sleeve, under the effect of shearing force, the shear pin 4 that is fixed on inner sliding sleeve and the housing is cut off, and inner sliding sleeve is under the effect of pressure, move down and sit and bump on the position of inner sliding sleeve lower limit pallet convex ring body 9,3 road pressure-bearing O RunddichtringOs 6 on the inner sliding sleeve have formed with the inner walls bottom and have born the sealing state that did not lose efficacy greater than 20 MPa wiper seals here.Because the outer head of liquid of sleeve pipe is greater than head of liquid in the sleeve pipe, like this inner sliding sleeve is produced a back pressure, the driving inner sliding sleeve moves up, but because the location jump ring 5 between inner sliding sleeve and the outer casing inner wall is stuck on the positioning ring groove 10, so, sit when inner sliding sleeve and to bump after on the lower limit dish convex ring body 9, though under the effect of back pressure, but inner sliding sleeve only has a small up displacement, this does not influence the sealing effectiveness of outer casing inner wall bottom and inner sliding sleeve, because sealing effectiveness is very good, just stopped the annular space cement paste and entered by float collar inside and form cement plug in the sleeve pipe and return high phenomenon.

Claims (3)

1, a kind of oil field drilled well automatic liquid feeding type casing float collar in the setting of casing process, it is constituting in the short circuit on the bunch tube of bottom, its feature: the short circuit shell is equipped with inner sliding sleeve 8 for 1 li, the release positioning ring groove 10 that position shearing pin 4, jump ring ring 5, annular chamber D and jump ring ring 5 are arranged between the two, intercommunicating pore C, E are arranged on the inner sliding sleeve wall, and between two holes, be welded with blind plate 7; Convex ring body 9 is arranged at the outer casing inner wall bottom simultaneously.

2, float collar as claimed in claim 1, its feature: sealing ring (3,6) can be arranged between shell and inner sliding sleeve (1,8).

3, float collar as claimed in claim 1, its feature: can be at inner sliding sleeve 8 upper port weldering bruising ring 2.

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