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Wellhead sealing device for downhole heating cable

A technology of sealing device and heating cable, which is applied in the directions of sealing/isolation, wellbore/well parts, earthwork drilling and production, etc. It can solve the problems of poor sealing performance and achieve the effect of enhancing the compression resistance and sealing effect

Active Publication Date: 2017-07-07
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a wellhead sealing device for downhole heating cables to solve the problem of poor sealing of downhole heating cables at the wellhead in the prior art

Method used

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  • Wellhead sealing device for downhole heating cable
  • Wellhead sealing device for downhole heating cable
  • Wellhead sealing device for downhole heating cable

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Embodiment Construction

[0027] It should be noted that, in the case of no conflict, the embodiments of the present invention 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.

[0028] In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is an embodiment of a part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0029] figure 1 Embodiment 1 of the wellhead s...

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Abstract

The invention provides a wellhead sealing device for a downhole heating cable. A sealing main pipe is fixed to a wellhead and used for penetrating of the cable, an upper gland is arranged inside the upper end of the sealing main pipe, a lower gland is arranged inside the lower end of the sealing main pipe, and the upper gland and the lower gland are each provided with a port which the cable can penetrate through. The wellhead sealing device further comprises an upper squeezing sealing member and a lower squeezing sealing member, wherein the upper squeezing sealing member is positioned in the sealing main pipe, located at the lower side of the upper gland and matched with the upper gland, and the lower squeezing sealing member is positioned in the sealing main pipe, located at the upper side of the lower gland and matched with the lower gland. A colloid injecting valve is arranged on the position, between the upper squeezing sealing member and the lower squeezing sealing member, of the sealing main pipe. The technical scheme of the wellhead sealing device for the downhole heating cable can effectively solve the problem that the airtightness of the downhole heating cable at a wellhead is poor.

Description

technical field [0001] The invention relates to the technical field of oil and gas production, in particular to a wellhead sealing device for downhole heating cables. Background technique [0002] During the production of oil and gas wells, when the bottom hole fluid is lifted to the surface through the wellbore, the high viscosity of crude oil or wax precipitation will lead to poor flow of wellbore production fluid or blockage of tubing, resulting in production reduction or even shutdown of oil and gas wells. When a problem arises, the downhole electric heating process will be used to solve this problem, that is, a heating cable is inserted into the oil production string, and controlled by the ground intermediate frequency power supply control cabinet, the liquid in the wellbore is heated to achieve heating, viscosity reduction, and solution. blocking purpose. [0003] In the process of heating the crude oil in the oil pipe with the heating cable, the circulation of the cr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/03
CPCE21B33/02E21B2200/01
Inventor 梁爱国史涛
Owner PETROCHINA CO LTD
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