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Heat-insulated well completion device and heat-insulated well completion method

A heat-insulating cavity and hot zone technology, applied in drilling equipment and methods, wellbore/well components, drilling equipment, etc., can solve the problems of poor heat insulation effect, achieve cost saving, low manufacturing cost, and easy replacement The effect of the inner casing

Active Publication Date: 2017-12-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For these wellbore heat insulation devices, due to the existence of couplings, after multiple rounds of steam stimulation, the heat insulation effect will become poor and the heat loss will be serious

Method used

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  • Heat-insulated well completion device and heat-insulated well completion method
  • Heat-insulated well completion device and heat-insulated well completion method
  • Heat-insulated well completion device and heat-insulated well completion method

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Experimental program
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Embodiment Construction

[0025] The present invention will be further described below in conjunction with accompanying drawing.

[0026] figure 1 A schematic structural view of the thermal insulation well completion device 10 according to the present invention is shown. Such as figure 1 As shown, the insulated completion device 10 includes an outer casing 20 and an inner casing 30 . In use, the inner sleeve 30 fits inside the outer sleeve 20, ie coaxially nests together. The outer sleeve 20 and the inner sleeve 30 will be described in detail below respectively.

[0027] figure 2 A schematic view of the structure of the outer sleeve 20 according to the present invention is shown. Such as figure 2 As shown, the outer sleeve 20 is a cylindrical structure, which includes a thermal insulation area 21 at the upstream part, a buckle area 22 at the middle part, and an installation area 23 at the downstream part. The inner diameter D21 of the heat insulation area 21 is greater than the inner diameter ...

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Abstract

The invention relates to a heat insulation well completion device and a heat insulation well completion method. The heat-insulated well completion device includes an outer casing, the outer casing includes a thermal insulation zone at its upstream part and a stabbing zone adjacent to the thermal insulation zone and downstream of the thermal insulation zone, and an inner casing arranged inside the outer casing, The inner sleeve includes a stab-fitting area at its downstream portion that is matched with the stabbing area and a heat-insulating matching area upstream of the stab-fitting area. A continuous thermal insulation cavity is formed between the thermal insulation matching zone and the thermal insulation zone. This insulated completion is well insulated and easy to replace.

Description

technical field [0001] The invention relates to the field of oil and gas wells, in particular to a thermal insulation well completion device. The invention also relates to a method of thermally insulated well completion using such an insulated well completion device. Background technique [0002] Geothermal development and heavy oil thermal recovery wells usually need to inject steam into the wellbore, which requires the wellbore to have a good heat insulation effect. A well-insulated wellbore can reduce the heat loss of steam along the wellbore wall, ensure the dryness and enthalpy of the steam injected into the formation, and improve the thermal recovery effect. Studying the relationship between the recovery factor and the bottom hole dryness shows that: to obtain a higher recovery factor, the bottom hole steam dryness must be kept above 40%. [0003] The current wellbore heat insulation devices can be broadly divided into two categories: one is oil pipe heat insulation;...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B17/00E21B43/24E21B7/20
Inventor 岳慧段友智庞伟姚志良侯倩吴俊霞朱明李晓益
Owner CHINA PETROLEUM & CHEM CORP