CN2178783Y

CN2178783Y - Wrapped sand filtering pipe with metal filter cover

Info

Publication number: CN2178783Y
Application number: CN 93235611
Authority: CN
Inventors: 吕从容; 王德新
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-12-23
Filing date: 1993-12-23
Publication date: 1994-10-05
Anticipated expiration: 2003-12-23

Abstract

The utility model relates to a wrapped sand filtering pipe with a metal filter cover, which is an underground sand filtering device for the exploitation of petroleum, natural gas and water well to prevent sands carried by fluid during an exploiting process from entering into exploitation pipe columns. The utility model is composed of a central pipe, a filtering sleeve, a top end cover, a bottom end cover, a sealing ring, wire windings, a supporting rib and gravels. The utility model descends into wells to directly face an exploitation horizon during application, and the fluid enters into the exploitation pipe column from a hole or a slot arranged on the central pipe through the wire windings, the gravels and the filtering sleeve. Sands with coarse particles carried by the fluid are blocked out of the wire winding layer, and sands with fine particles are blocked out of the filtering sleeve. The gravels can prevent the fine particles from blocking the sand filtering pipe and keep the passing ability of the fluid.

Description

Wrapped sand filtering pipe with metal filter cover

The present invention is a kind of filter sand device, is used in the recovery well of oil, natural gas and water, prevents that the fine grained sand that above-mentioned fluid carries in recovery process from entering in the mining tubular column.

At present, used multiple filter sand device in oil, natural gas and the well, these down-hole filter sand devices are effectively for preventing that the sand grains of diameter greater than 0.15 millimeter from entering mining tubular column, but not good less than 0.15 millimeter fine grained sand result of use for diameter.

The wrapping wire sand screen purpose that has metal filtration cover is to prevent that diameter from entering in the mining tubular column and the down-hole filter sand device of invention less than 0.15 millimeter fine grained sand.

Sand screen is made up of central tube＜1 〉, mistake filter ruffle＜2 〉, upper end cover＜3 〉, sealing ring＜4 〉, wrapping wire layer＜5 〉, bottom end cover＜6 〉, brace rod＜7〉and gravel＜8 〉, sees accompanying drawing.

Central tube＜1〉is a steel pipe, and two ends are threaded, and is convenient to connect with the other parts of mining tubular column.The middle part has circular hole or oblong groove, and the fluid after the filtration is entered in the mining tubular column along these holes or groove.Be with filtration cover＜2〉in the outside of central tube＜1 〉, it can shelter from whole circular holes or the oval-shaped slot of being opened on the central tube＜1 〉.Crossing filter ruffle＜2〉is metallic sheath thin-walled, that have micropore, uses stainless steel material to make with powder sintering method.Cross filter ruffle＜2〉is fixed on central tube＜1〉by upper end cover＜3〉and bottom end cover＜6〉and sealing ring＜4〉middle part.Upper end cover of steel＜3〉and bottom end cover＜6〉are fixed on the two ends of central tube＜1 〉.Sealing ring＜4〉is made with rubber, seals between central tube＜1〉and mistake filter ruffle＜2 〉.The outside crossing filter ruffle＜2〉is furnished with steel brace rod＜7〉equably between upper end cover＜3〉and bottom end cover＜6 〉, its two ends and upper end cover＜3〉and bottom end cover＜6〉are fixed together.In the outside of brace rod＜7〉wrapping wire＜5〉is arranged, with the stainless steel wire of trapezoid cross section with certain pitch between full upper end cover＜3〉and bottom end cover＜6 〉., all there is equal gap at the big end of trapezoid cross section towards the sand screen outside between the two adjacent rings wrapping wire.Each contact point of wrapping wire＜5〉and brace rod＜7〉is firm welding all.Fill up gravel＜8〉by the space of the hole on the upper end cover＜3〉between separated wrapping wire of supported muscle＜7〉＜5〉and mistake filter ruffle＜2 〉.Gravel＜8〉can be by quartz sand, also can be made up of haydite etc., and its external surface scribbles thermohardening lacquer.

The minimum diameter that fluid carries sand is D, and the micro-pore diameter of then crossing filter ruffle＜2〉should be (0.85～0.95) D, and the diameter of gravel＜8〉should be (8～9) D, and the gap between wrapping wire＜5〉two adjacent rings should be (5～6) D.

The length of sand screen can be associated in together to adapt to thicker mined bed by several sand screens by the thickness decision of mined bed.

Sand screen is connected on G.I.H in the exploitation pipe, makes it over against mined bed.Sand screen absorbs the stratum heat solidifies the thermohardening lacquer on the gravel＜8 〉, and gravel is joined together.Fluid can and be crossed filter ruffle＜2〉by wrapping wire＜5〉gravel＜8〉and be entered in the mining tubular column by hole or the groove left in the middle of the central tube＜1 〉.Thicker particle is blocked in the outside of wrapping wire＜5〉in the entrained sand of fluid, and thinner class grain was blocked in the outside of filter ruffle.Owing to the existence of gravel＜8〉is arranged, makes sand screen extremely do not kept the handling capacity of fluid by the fine sand sand plug.

Claims

1, have the wrapping wire sand screen of metal filtration cover, it is characterized in that by central tube＜1 〉, cross filter ruffle＜2, wrapping wire＜5 and gravel＜8 form.

2, filter sand device according to claim 1 is characterized in that filter ruffle＜2〉is the metallic sheath of the band micropore made with powder sintering by stainless steel material, was fixed on the central tube＜1〉with upper end cover＜3 〉, bottom end cover＜6〉and sealing ring＜4 〉.

3, filter sand device according to claim 1 is characterized in that wrapping wire＜5〉is that the stainless steel wire of trapezoid cross section is around in the outside that is contained in the brace rod＜7〉between upper end cover＜3〉and the bottom end cover＜6 〉.

4, filter sand device according to claim 1 is characterized in that gravel＜8〉is to be filled in the separated wrapping wire of supported muscle＜7〉＜5〉and to be crossed in the space between the filter ruffle＜2〉by quartz sand or haydite.Quartz sand and haydite external surface scribble thermohardening lacquer.