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Concentric-tube double-tube steam injection wellhead device

A technology of wellhead devices and concentric pipes, which is applied in the direction of wellbore/well valve devices, wellbore/well components, and production fluids, can solve the problems of large volume of steam injection wellhead devices, difficult operation and complicated operation, etc., and achieve Ensure long-term sealing and stability, convenient construction, small size effect

Inactive Publication Date: 2012-02-22
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The steam injection wellhead device has a large volume and a high wellhead, making operation and construction difficult and complicated.

Method used

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  • Concentric-tube double-tube steam injection wellhead device
  • Concentric-tube double-tube steam injection wellhead device
  • Concentric-tube double-tube steam injection wellhead device

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Embodiment Construction

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0030] Such as figure 1 , 2 As shown, the present invention provides a concentric double-tube steam injection wellhead device, which includes a large cross 1 and a double-pipe cross 2 . Wherein, the large cross 1 is provided with a cross-shaped transverse passage 11 and a longitudinal passage 12, and a heat-insulated pipe hanger 3 is sealed at the upper end of the longitudinal passage 12, and the heat-insulated pipe hanger 3 has injection Steam through hole 31; t...

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Abstract

The invention discloses a concentric-tube double-tube steam injection wellhead device, which comprises a big cross fan and a double-tube cross fan, wherein a lateral path and a longitudinal path which are in cross arrangement are arranged in the big cross fan; the upper end of the longitudinal path is provided with a heat insulation tube hanger in a sealing mode; the heat insulation tube hanger is provided with a steam injection through hole; the double-tube cross fan is connected to the upper part of the big cross fan; the double-tube cross fan is provided with an inner steam injection path; an outer steam injection path is arranged on the periphery of the inner steam injection path; the lower end of the outer steam injection path extends radially and inwards to form a diffusion path; the diffusion path is positioned below the inner steam injection path; the lower end of the inner steam injection path is connected with an inner tube joint; the diffusion path is opposite to the steam injection through hole of the heat insulation tube hanger; and the oil tube joint extends into the steam injection through hole. The concentric-tube double-tube steam injection wellhead device has the advantages of simple structure, small volume, and reliable long-acting sealing and impact resistance in a long-term high-temperature and high-pressure condition in the steam injection process, and is convenient and flexible to operate.

Description

technical field [0001] The invention relates to a wellhead device, in particular to a concentric tube double-pipe steam injection wellhead device used in horizontal well steam injection production. Background technique [0002] At present, the steam injection wellhead device with concentric tubes and double tubes is an important part of the ground control equipment for steam injection in horizontal wells, and it is the key technical equipment to realize segmented steam injection in different oil layers or in different layers of the same oil layer without moving the string. . [0003] Existing steam injection wellhead devices generally include a large four-way, an outer pipe small four-way, an inner pipe small four-way and a wax removal gate valve. Among them, the side end of the large cross is fixedly installed with a casing gate valve, the top of the large cross is fixedly installed with the bottom end of the small cross of the outer pipe, and the side end of the small cro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/03E21B43/24E21B34/02
Inventor 关仲孙厚利王显荣杨淑英郭玉强何传兴杨忠德魏凯李广辉王斌杨凯赵旭亮杜晓雪孙香秋常鹏梅
Owner PETROCHINA CO LTD
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