CN201090202Y

CN201090202Y - Heat insulation pipe without coupling

Info

Publication number: CN201090202Y
Application number: CNU2007200146691U
Authority: CN
Inventors: 刘文科; 潘耀庆; 朱进礼; 李茂勇
Original assignee: Liaohe Petroleum Exploration Bureau
Current assignee: Liaohe Petroleum Exploration Bureau
Priority date: 2007-09-24
Filing date: 2007-09-24
Publication date: 2008-07-23
Anticipated expiration: 2017-09-24

Abstract

The utility model relates to an oil well steam injection heat insulated pipe, in particular to a heat insulated pipe having no coupling connection. The utility model is composed of external pipes, internal pipes and a thermal insulation system; a heat insulated protective casing is arranged between the external pipes, and welding seams between the internal pipes and the external pipes are disposed at the outer layer of a steam injection channel. The heat insulated pipes are connected together by buttress screw threads. The utility model adopts the direct connecting structure with simple operations in underground and safety and reliability, the welding seams are positioned at the outside of the heat insulated pipe for injecting the steam to the inner cavity of the heat insulated pipe without blockage, therefore the down hole operation can be carried out smoothly, as well as reducing the heat loss, guaranteeing the quality of steam injection and extending the service life of the heat insulated pipe. The utility model can save energy and reduce costs.

Description

A kind of instlated tubular that does not have the box cupling connection

Technical field:

The utility model relates to a kind of oil well steam injection instlated tubular, especially a kind of instlated tubular that does not have the box cupling connection.

Background technology:

Employed instlated tubular all adopts the vacuum heat-insulation technology in the oil well steam injection process, because being in, annotates in the vapour passage girth joint between interior pipe and the outer tube, and connection is again to rely on the screw thread box cupling to realize between the instlated tubular, this structure is the thread seal poor performance in use, in addition since between the inner and outer pipes weld seam in annotating the vapour passage, easily cause tube corrosion through long-term the notes after vapour uses, not only reduce the application life of instlated tubular, the vapour losses in the time of can increasing thickened oil recovery again in the commissure.

The utility model content:

The utility model purpose is in order to overcome above-mentioned shortcoming, and provide a kind ofly do not have an instlated tubular that box cupling connects, can when vapour is annotated in thickened oil recovery, reduce vapour losses, reduce the corrosion of steam butt welded seam, thereby can the prolong insulation pipe application life, the saving cost.

The technical scheme that its technical problem that solves the utility model adopts is: it is made up of outer tube, interior pipe, insulation system; The thermal insulation protection cover is housed between the described outer tube, and the weld seam between interior pipe, the outer tube is being annotated vapour passage skin.

Link together by inclined to one side buttress thread between the described instlated tubular.

The utility model compared with prior art has remarkable result:

Owing between the outer tube of the present utility model the thermal insulation protection cover is housed; can prevent preferably that the steam injection string heat scatters and disappears; in addition, the boxing knot seam between the inner and outer pipe makes the following well tool by the instlated tubular inner chamber can not stopped when G.I.H not annotating vapour passage the inside like this; can be safely from wherein being lowered to; can prevent the corrosion of steam again, can improve instlated tubular application life undoubtedly, reduce heat waste tubing; and then guarantee to annotate the vapour quality, make its instlated tubular bring into play superior heat-proof quality.

Description of drawings:

Accompanying drawing is the utility model structural representation.

Among the figure, 1, outer tube, 2, interior pipe, 3, the thermal insulation protection cover, 4, insulation system.

The specific embodiment:

Among the figure; outer tube 1 forms for N80 grade steel pipe or 13 straight-chromiun stainless steel material; at the outer tube two ends is the pipe that has screw thread; interior pipe 2 two ends are different-diameter and the pipe that has screw thread; thermal insulation protection cover 3 is housed between described outer tube 1; outer tube 1; the insulation system 4 that useful aluminium foil or glass wool cloth material are twined between the interior pipe 2; can make instlated tubular play insulation effect; the outer position of vapour passage is being annotated in the commissure of outer tube and interior pipe junction during assembling; welding procedure can make tubing string have stable welding performance thus, and formed thus notes vapour passage can reduce the corrosiveness of high-temperature steam to the steam injection pipeline passage again.The instlated tubular of being made up of outer tube 1, interior pipe 2, thermal insulation protection cover 3 and insulation system 4 is to finish by inclined to one side buttress thread to each other when connecting in addition.

Claims

1. an instlated tubular that does not have the box cupling connection is made up of outer tube (1), interior pipe (2), insulation system (4); It is characterized in that: thermal insulation protection cover (3) is housed between the described outer tube, and the weld seam between interior pipe (2), the outer tube (1) is being annotated vapour passage skin.

2. a kind of instlated tubular that box cupling connects that do not have according to claim 1 is characterized in that: link together by inclined to one side buttress thread between the described instlated tubular.