CN2898282Y

CN2898282Y - Packer with penetrating hole

Info

Publication number: CN2898282Y
Application number: CN 200520123841
Authority: CN
Inventors: 王强; 曹爱丽
Original assignee: Tianjin University of Technology
Current assignee: Tianjin University of Technology
Priority date: 2005-12-06
Filing date: 2005-12-06
Publication date: 2007-05-09
Anticipated expiration: 2015-12-06

Abstract

The utility model relates to a packer with a plurality of infiltration holes, comprising a tubular hollow shaft, which is characterized in that a connecting thread is arranged at both ends of the hollow shaft; one or a plurality of radial expansion guide rings are axially fixed on the external diameter of the hollow shaft; a plurality of infiltration holes communicating the inside and outside are distributed on the pipe wall of the hollow shaft axially and radially; a plurality of expansive rubber plugs are arranged at the outside of the hollow shaft for packing the radial expansion guide rings inside. The utility model does not have assemblies and strengthened layer and has a simple production process; the infiltration holes arranged on the hollow shaft can make the oil in the hollow shaft contact with the plug rapidly through the infiltration hole so as to increase the expanding speed. In additional, no auxiliary associated facility is required for packer operation, so the utility model has the advantages of energy saving, easy installation, low operation cost and applicability to underground working environment.

Description

The packer that has permeability hole

[technical field]

The utility model relates to oil field underground equipment parts, particularly a kind of packer that has permeability hole in the oil well plugging process.

[background technology]

To be oil well producing or during well workover the oil well plugging packer, isolates the device of the interval or well cementation in stratum.Only retrieve China's recent two decades patent documentation, oil well plugging technology-specific instrument packer, multinomial above 300.Various ways such as mechanical type, waterpower formula, hydraulic formula, self-sealing are arranged.U.S.6073692, the corrugated axle causes the cross sectional shape change with waterpower or mechanical force and expands.U.S.4886117 has complicated multilayer to give stress metal netting between inside and outside elastomer layer, expands when causing by borehole fluid pressure.U.S.4753444, sealing ring is made up of poly-aryl ketones etc., and when executing longitudinal pressure, the sealing ring footpath is outwards buckled and is sealed.U.S.4781249 realizes gradual expansion by valving.CN2242332Y is made up of reducing central tube and fluorine, lead-tight ring, seals by upper and lower the moving of tubing string.CN2617919Y makes the packing element expansion by the sliding metal cover.The CN1236857A water-based fluid activates packing element and realizes shutoff under the guider effect.CN2386189Y is made up of joint, lining, packing element etc., shutoff after the water inlet.Above-mentioned these packers De Que Dian is that structure is comparatively complicated.

[utility model content]

The purpose of this utility model is in order to overcome the deficiencies in the prior art, a kind of packer product that has permeability hole to be provided, and this packer does not have movable part, and manufacturing process is simple, and cost is low.

The scheme that the utility model adopted is a kind of packer that has permeability hole of design, it comprises the hollow mandrel of tubulose, the two ends that it is characterized in that said hollow mandrel are provided with the connection screw thread, the external diameter of hollow mandrel is fixed with one or more expanded radially guide rings vertically, on the hollow mandrel tube wall vertically and be radially distributed with a plurality of inside and outside permeability holes that connect; The outside of said hollow mandrel is provided with the expanded radially guide ring is enclosed in the stifled core of interior expanded rubber.

The utility model compared with prior art, the packer of making does not have assembled component, does not have back-up coat, manufacturing process is simple; Permeability hole is set on hollow mandrel, be more conducive to the fluid in the hollow mandrel, contact with stifled core rapidly by permeability hole, increase its speed of expansion 10-20%, can activate stifled core after meeting oil or water when making this packer work, toroidal cavity between the oil pipe of shutoff oil-water well and sleeve pipe or the borehole wall voluntarily quickly is to realize isolating selectively the purpose of the interval or well cementation in stratum.Expansion guide ring on hollow mandrel can be given and axial restraint when the stifled core of expanded rubber expands, and it is radially expanded; Simultaneously, also can improve the ability of the stifled core opposing of expanded rubber axial compression.In addition, without the auxiliary ligand complete equipment, energy conservation is installed simply during this packer work, and operating cost is low, is suitable for the underground work environment.

[description of drawings]

Fig. 1 is the packer front view that has permeability hole;

Fig. 2 is the packer vertical view that has permeability hole.

Be described in detail with reference to accompanying drawing below in conjunction with embodiment of the present utility model.

[specific embodiment]

As shown in drawings, the utility model packer is sulfided into one by the stifled core (4) of the expanded rubber of hollow mandrel (1) and hollow mandrel outside by bonding.Its hollow mandrel length is not limit, and decides according to actual needs, can be 2-8m, or longer.For ease of processing and transportation, the preferred 3-4m of suitable length can be together in series during use as required.

The uniform inside and outside permeability hole (8) that connects of hollow mandrel, the hole collar extension is covered with the filter screen (not shown).Fluid in the hollow mandrel can contact with stifled core by permeability hole, thereby increases stifled core speed of expansion.

There is the connection screw thread of suitable length at the hollow mandrel two ends, are welded with some expanded radially guide rings (3) in the hollow mandrel outside vertically, overlook vertically, and the interior circle of expansion guide ring matches with the axle external diameter, and outside diameter then is slightly less than the stifled core external diameter of expanded rubber.Match with flow string in the inside and outside footpath of hollow mandrel, the size of the stifled core external diameter of expanded rubber is by toroidal cavity size decision between flow string and the sleeve pipe or the borehole wall.

Claims

1, a kind of packer that has permeability hole, the hollow mandrel that comprises tubulose, the two ends that it is characterized in that said hollow mandrel are provided with the connection screw thread, the external diameter of hollow mandrel is fixed with one or more expanded radially guide rings vertically, on the hollow mandrel tube wall vertically and be radially distributed with a plurality of inside and outside permeability holes that connect; The outside of said hollow mandrel is provided with the expanded radially guide ring is enclosed in the stifled core of interior expanded rubber.

2, packer according to claim 1 is characterized in that the permeability hole collar extension on the said hollow mandrel is covered with filter screen.

3, packer according to claim 1 is characterized in that the stifled core of the outside bonding sulfuration of said hollow mandrel expanded rubber.

4, packer according to claim 1 is characterized in that the length 3-4m of said hollow mandrel.