CN2078793U

CN2078793U - Thermal expansion packer

Info

Publication number: CN2078793U
Application number: CN 90219566
Authority: CN
Inventors: 吴德华; 梁振民; 嵇泽石
Original assignee: Liaohe Petroleum Exploration Bureau
Current assignee: Liaohe Petroleum Exploration Bureau
Priority date: 1990-10-24
Filing date: 1990-10-24
Publication date: 1991-06-12

Abstract

The utility model relates to a thermal expansion type metal thermal recovery packer used for a steam injection well of a high-viscosity oil field, which is composed of a thermal expansion body 1, a central pipe 2, a bearing pad 3, a sealing piece 4, a supporting sleeve 5 and a joint 6. The thermal expansion packer is lifted and lowered with a steam injecting pipe column. The packer is sealed automatically after expanded by that the heat energy of steam has action on expansion agent filled in the thermal expansion body 1. Thereby, compared with the other thermal packers, the thermal expansion packer is easy to operate and control construction quality. The utility model has the advantages of novel structure and favorable performance. By utilizing the thermal expansion packer, the long-term seal and the normal steam injection of the steam injecting pipe column can be ensured under the condition that the pressure difference is 25 MPa and the temperature is 360 DEG.

Description

Thermally expansive metal thermal packer

The utility model relates to a kind of downhole hardware that is used for high-viscosity oil field exploitation via steam injection viscous crude---hot swollen formula metal thermal packer.

The exploitation via steam injection viscous crude proves a kind of effective process by practice at home and abroad, and thermal packer then is a main downhole hardware of realizing this process.At present, the various thermal packers that are used for steamed well generally produce composite seals such as axial force compression asbestos, graphite, various fibers and realize its sealing performance by machinery or waterpower mode.Because the influence of factors such as form of structure and material, above-mentioned packer exists complex structure, the breakage rate height of going into the well, heat seal unstable properties, be difficult to deficiencies such as control construction quality, especially when downhole temperature reaches more than 340 ℃, be difficult to guarantee to annotate the vapour quality.

Task of the present utility model provides a kind of novel thermally expansive metal packer, utilize this kind packer to be no more than under the condition that 25MPa, temperature be not higher than 360 ℃ at pressure reduction, guarantee steam injection tubing string long term seal, guarantee the long-time normal stable vapour of annotating, improve the thickened oil recovery effect.

The utility model is to realize like this.It is made up of thermal expansion body 1, central tube 2, pressure-bearing pad 3, seal 4, splicing sleeve 5 and joint 6.Its number of assembling steps is as follows: according to a certain volume expander (thermal expansion agent) is charged into the annular space chamber of thermal expansion body 1, with welding the annular space chamber is sealed subsequently; Central tube 2 is inserted splicing sleeve 5, its outer step is matched with the latter's interior step, again seal 4 is enclosed within central tube 2 outsides; With pressure-bearing pad 2 thereon, central tube 2 is linked to each other with thermal expansion body 1 lower end by screw thread from central tube 2 ends of thread cover; Joint 6 is linked to each other with splicing sleeve 5 lower end internal threads by the upper end screw thread.Then this packer assembling finishes.This packer that assembling is finished removes also in company with steam injection string one, and its lower end is connected to the tail pipe of certain-length, and tail pipe is partly with instruments such as screen casing and plug; Behind the precalculated position, rely on the supporting role of tail pipe and the weight compressive seal 4 of steam injection string under the packer, make it again that moulding causes initial sealing, to accelerate the rising of down-hole vapor (steam) temperature; Then, well head is installed and is begun to annotate vapour, annotate vapour after 20 minutes, downhole temperature raises, and thermal expansion body 1 expands rapidly, and its external surface is compressed in to annotate on the vapour casing wall and causes sealed-for-life.After packer is finished above-mentioned whole envelope actions, can carry out normal steam injection.When needing the packer deblocking, can reduce downhole temperature in advance behind long-term notes vapour, make and produce negative pressure in the thermal expansion body 1, its external surface is kept to zero to the normal pressure of sleeve pipe wall; Then, on carry steam injection string splicing sleeve 5 moved down, seal 4 is regained, then packer just and steam injection string be suggested well head together.

The utility model novel structure utilizes it to be no more than at pressure reduction and guarantees steam injection tubing string long term seal and the normal vapour of annotating under the condition that the 25MPa temperature is not higher than 360 ℃.Because seat envelope voluntarily after this packer and steam injection string together remove and can rely on steam thermal energy to make it to expand, thereby than the more easy to operate and control construction quality of other heating power packers.

Accompanying drawing is the utility model general structure schematic diagram.

Below in conjunction with accompanying drawing enforcement of the present utility model is described further.

Thermal expansion body 1 of the present utility model is the outstanding hollow Cylinder in middle part, inside and outside footpath is respectively ∮ 62 and ∮ 152mm, the annular space chamber that the gap is 20mm (in order to fill expander) is left at the middle part, and two ends are all 21/2 " common plain end oil well pipe screw thread, its material is the carbon element alloy steel; Central tube 2 is a garden pipe, an end band step, the other end is 21/2 " and common plain end oil well pipe screw thread, material 35CrMb; Pressure-bearing pad 3 usefulness 45# steels are done, and its external diameter is 152mm, internal diameter 110mm, thick 15mm; Seal 4 is formed by the umbrella shape seal combination of multistage ∮ 150 * ∮ 110 * 10, also can adopt ∮ 150 * 110 garden tubular oil resistant butadiene-acrylonitrile glue; Splicing sleeve 5 usefulness 45# steels are done, one end band M140 internal thread, other end band step; Joint 6 one ends are the M140 external screw thread, and the other end is 21/2 " common plain end oil well pipe screw thread, material is the 45# steel.

Claims

1, a kind of thermally expansive metal thermal packer that is used for high-viscosity oil field steamed well is made up of thermal expansion body 1, central tube 2, pressure-bearing pad 3, seal 4, splicing sleeve 5 and joint 6, it is characterized in that:

A) thermal expansion body 1 lower end that is filled with expander in the annular space chamber links to each other with central tube 2 by screw thread;

B) central tube 2 outsides are with pressure-bearing pad 3 and seal 4, and splicing sleeve 5 is inserted in its lower end, and both steps match;

C) splicing sleeve 5 lower ends link to each other with joint 6 upper ends by screw thread.

2, thermally expansive metal thermal packer according to claim 1, it is characterized in that, thermal expansion body 1 is the outstanding hollow Cylinder in middle part, inside and outside footpath is respectively ∮ 62 and ∮ 152mm, the annular space chamber that the gap is 20mm is left at the middle part, wherein fill with expander, two ends are 21/2 " common plain end oil well pipe screw thread, its material is the carbon element alloy steel.

3, thermally expansive metal thermal packer according to claim 1 is characterized in that, central tube 2 is a garden pipe, an end band step, the other end is 21/2 " and common plain end oil well pipe screw thread, material 35CrMb.

4, thermally expansive metal thermal packer according to claim 1 is characterized in that, seal 4 is formed by the umbrella shape seal combination of multistage ∮ 150 * ∮ 110 * 10, also can adopt ∮ 150 * ∮ 110 garden tubular oil resistant butadiene-acrylonitrile glue.