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Double-pipe wellhead device

A wellhead device and casing technology, which is applied in the direction of drill pipe, casing, drilling equipment, etc., can solve the problems of short service life, etc., and achieve the effect of solving short service life and avoiding the leakage of wellhead devices

Inactive Publication Date: 2019-11-19
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a double-pipe wellhead to solve the problem of short service life of the wellhead in the prior art

Method used

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  • Double-pipe wellhead device

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Embodiment Construction

[0028] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0029] In the prior art, the invention with the application publication number of CN102359355A discloses a concentric tube double-pipe steam injection wellhead device, which includes: a large four-way, which is provided with a cross-shaped transverse channel and a longitudinal channel, and in the longitudinal channel The upper end of the seal is provided with a heat-insulating pipe hanger, and the heat-insulating pipe hanger has a steam injection through hole; the double-pipe cross is connected to the upper part of the large cross, and the double-pipe cross has an internal steam injection channel, and the internal steam injection The outer steam injection channel is arranged on the periphery of...

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Abstract

The invention provides a double-pipe wellhead device. The double-pipe wellhead device is used for connecting an inner pipe column and an outer pipe column which externally sleeves the inner pipe column; the double-pipe wellhead device comprises an inner pipe tee provided with a first longitudinal passage communicating with an inner through hole of the inner pipe column and an outer tube cross provided with a second longitudinal passage communicating with the first longitudinal passage; a first annular gap is formed between the inner wall surface of the outer pipe column and the outer wall surface of the inner pipe column, and the first annular gap communicates with the second longitudinal passage. By applying the technical scheme, the problem that a wellhead device in the prior art is short in service life is solved.

Description

technical field [0001] The invention relates to the field of oil exploitation, in particular to a double-pipe wellhead device. Background technique [0002] In the prior art, the invention whose application publication number is CN104389544A discloses a different-diameter double-pipe oil production wellhead casing head, and specifically discloses a different-diameter double-pipe oil production wellhead casing head, which includes two oil pipes, casing Pipe head spool, Christmas tree, slab gate valve, threaded flange, pressure gauge stop valve assembly and throttle valve, casing head spool are connected to the integral flanged Christmas tree by bolts, and there are double-pipe suspensions with different diameters inside. Two oil pipes are fixed on the hanger, which can carry out oil production operations in two different areas at the same time. The hanger is also designed with a stop device, which has the function of preventing the lower casing from loosening when the cementi...

Claims

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Application Information

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IPC IPC(8): E21B33/03E21B33/04E21B17/18E21B43/00
CPCE21B17/18E21B33/03E21B33/04E21B43/00
Inventor 秦义李占省雷鹏飞游靖谢刚苑习之赵文秀
Owner PETROCHINA CO LTD
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