CN2536786Y

CN2536786Y - Self-adjusting sandcontrol pipe

Info

Publication number: CN2536786Y
Application number: CN 02224612
Authority: CN
Inventors: 蔡亚西; 岳仲喜
Original assignee: Deyang Huadi Petroleum Equipment Co ltd; Xi'an Nate Petroleum Technology Co ltd
Current assignee: Deyang Huadi Petroleum Equipment Co ltd; Xi'an Nate Petroleum Technology Co ltd
Priority date: 2002-03-12
Filing date: 2002-03-12
Publication date: 2003-02-19
Anticipated expiration: 2012-03-12

Abstract

The utility model relates to a self-regulating sand-proof tube, belonging to the oil, gas and water wells completion technical field of the petroleum engineering and the water conservancy. The prior art has the disadvantages as follow: 1, the gaps can be easily plugged or even stopped by the sand grains; 2, since the whole sand-proof device can not be backwashed and reused flushing out the sand grains and removing the plugging, the service life is short. The technical proposal is that: the self-regulating sand-proof tube comprises a base tube with through holes, a protecting sleeve with pores and the fastening device of the two ends of the protecting sleeve. The utility model is characterized in that: a support sleeve with slits and a filling net are orderly arranged between the base tube and the protecting sleeve. The filling net is an elastic body with capillary porosity and is made from pressed metal wire.

Description

A kind of self-interacting type is prevented sandpipe

Affiliated technical field:

The utility model relates to oil, gas, the well completion technique field in petroleum works, the hydraulic engineering, specifically is the anti-sandpipe of a kind of self-interacting type.

Background technology:

The sand control installation that is adopted in the completion engineering of existing oil, gas, well as the ceramic capillary sand filter, all is based on the principle of slit or fracture filtration, allows formation fluid, flows through this sand control installation face and sand grains is blocked in outside the pit shaft as oil, gas, water etc.But because in recovery process, the sand production rate on the production fluid amount of every mouthful of well, the swabbing pressure of mining equipment and stratum, the size distribution of sand grains are the processes of a dynamic change, and the size of the slit of such sand control installation or hole immobilizes, can't regulate, thereby prior art exists following deficiency: 1, sand grains stops up the slit easily, and very easily blocks; 2, whole sand control installation can't carry out backwash, reuse after sand grains is gone out de-plugging, so the life-span is shorter.More than these two reasons all can cause oil, gas, well parking well workover, even shorten effective production life of well of oil, gas, well, reduce output, the reduction economic benefit.

Summary of the invention

The purpose of this utility model provides the anti-sandpipe of a kind of self-interacting type, and overcoming prior art can not the adjustment apertures size, sand grains easily stops up, and can not carry out backwash de-plugging operation, thus application life short defective.

For achieving the above object; technical solution of the present utility model is: a kind of self-interacting type is prevented sandpipe; include the fastener at the parent tube 1 of through hole, the protective sleeve 8 that hole is arranged and protective sleeve 8 two ends, it is characterized in that: the support set 10 and the fill-net 9 that are provided with slit 11 between described parent tube 1 and the protective sleeve 8 successively.

Above-mentioned fill-net 9 is the elastic bodys that have capillary channel.

Above-mentioned fill-net 9 is to be formed by the wire compacting.

Above-mentioned fastener comprises upper and

lower baffle ring

4,3 and upper and lower plug 6,2; described upper and

lower baffle ring

4,3 is positioned at the two ends of protective sleeve 8; upper and

lower baffle ring

4,3 is respectively arranged with upper and lower plug 6,2 along the parent tube 1 axial outside, have respectively on described upper and

lower baffle ring

4,3 and the upper and lower plug 6,2 can be mutually chimeric protruding eaves of ring-type and the ring-type cavity that caves in.

The above-mentioned cavity cross section of caving in is a wedge shape, and protruding eaves cross section is can chimeric with it wedge shape.

Advantage of the present utility model is as follows:

1, sand control capability is good: the utility model is constituted the multiple sand control structure in the parent tube outside, so is had sand control capability preferably by outer layer protective sleeve, variable fill-net and the support set in aperture;

2, adhere to sand grains few, can effectively prevent stifled husky: fill-net is that elastic body is as fill-net, the capillary channel that has variable aperture in it, capillary channel can change along with the swabbing pressure fluctuation, the sand grains that adheres to is few, thereby difficult stifled sand, and when a small amount of sand grains enters in the capillary channel, can form secondary sand bridge filtration beds automatically, so the filter effect raising, thereby the sand control function further improved;

3, can carry out backwash de-plugging operation: the utility model has added elastic body as fill-net, but the reducing that utilizes its capillary channel carries out anti-flushing well sand washing operation, fill-net is under the anti-flushing well punching press in this process, it is big that the aperture can become, the sand grains that stops up just is easy to be flushed away, thereby finishes the de-plugging operation; The support set that adds in the utility model can protect fill-net indeformable, to increase the service life;

4, applied widely: applicable to the output liquid of acid, alkali, hot environment and different viscosities and the different modes of production;

5, fastener is simple in structure, and easy construction is safe and reliable, requires low to operating condition.

Because above-mentioned advantage is arranged, so the utility model can prolong effective productions life-span of oil, gas, well, and the saving operating cost is increased economic efficiency.

The explanation of accompanying drawing drawing:

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is the A portion structure for amplifying schematic diagram of Fig. 1.

Mark is described as follows among the figure:

The 1-parent tube, 2-lower end cap, 3-lower baffle ring, 4-upper baffle ring, 5-trip bolt, 6-upper plug head, 7-box cupling, 8-protective sleeve, 9-fill-net, 10-support set, 11-slit.

The specific embodiment:

Below in conjunction with drawings and Examples the utility model is further described:

Referring to Fig. 1,2, the utility model will be drilled with the stainless steel of through hole as parent tube 1, at parent tube 1 two ends the external screw thread that cooperates with box cupling 7 be arranged, and the surface of parent tube 1 is disposed with support set 10, fill-net 9, protective sleeve 8 from inside to outside; Said support set 10 is that stainless steel is trembled, and the slit of making through slot 11 is arranged on it, and fill-net 9 is elastic bodys of being suppressed the band capillary channel that forms by stainless steel wire; Said support set 10, fill-net 9 and 8 liang of protective sleeves are auspicious by upper and

lower baffle ring

4,3 location; upper and

lower baffle ring

4,3 along parent tube 1 axially the ring-type wedge shape cavity that caves in the outside be enclosed within on the protruding eaves of upper and lower plug 6,2 in its outside; both are chimeric mutually, and last lower end cap 6,2 is located and is fixed on the parent tube 1 by trip bolt 5.

When using the utility model; when the output liquid of oil, gas, well flows through this anti-sandpipe under the effect of down-hole swabbing pressure; outer layer protective sleeve 8 will be blocked in greater than the sand grains of slot size outside the anti-sandpipe; the filtration of flexible capillary channel can change the aperture of capillary channel along with the fluctuation of swabbing pressure in the fill-net 9; to block greater than the sand grains of minimum-value aperture, make it not enter pit shaft.Simultaneously, because the aperture of capillary channel constantly changes, the sand grains that is blocked within it is unlikely to stop up the duct, causes the appearance of stifled sand accident.

Behind long-term use the utility model, can carry out anti-flushing well sand washing de-plugging operation.Fill-net 9 is under the effect of anti-flushing well punching press, and it is big that the aperture becomes, and the sand grains that is blocked in fill-net 9 ducts is easy to be flushed away, thereby finishes the de-plugging operation.The support set 10 that is arranged on fill-net 9 internal layers can protect fill-net 9 indeformable when the anti-flushing well operation.

Claims

1, the anti-sandpipe of a kind of self-interacting type; include the fastener at the parent tube (1) of through hole, the protective sleeve (8) that hole is arranged and protective sleeve (8) two ends, it is characterized in that: the support set (10) and the fill-net (9) that are provided with slit (11) between described parent tube (1) and the protective sleeve (8) successively.

2, the anti-sandpipe of a kind of self-interacting type as claimed in claim 1, it is characterized in that: described fill-net (9) is the elastic body that has capillary channel.

3, the anti-sandpipe of a kind of self-interacting type as claimed in claim 2 is characterized in that: described fill-net (9) is to be formed by the wire compacting.

4, as claim 2 or the anti-sandpipe of 3 described a kind of self-interacting types; it is characterized in that: described fastener comprises upper and lower baffle ring (4), (3) and upper and lower plug (6), (2); described upper and lower baffle ring (4), (3) are positioned at the two ends of protective sleeve (8); upper and lower baffle ring (4,3) is respectively arranged with upper and lower plug (6,2) along the axial outside of parent tube (1), have respectively on described upper and lower baffle ring (4,3) and the upper and lower plug (6,2) can be chimeric mutually protruding eaves of ring-type and the ring-type cavity that caves in.

5, the anti-sandpipe of a kind of self-interacting type as claimed in claim 4, it is characterized in that: the described cavity cross section of caving in is a wedge shape, protruding eaves cross section is can chimeric with it wedge shape.