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Multi-layer heat preservation structure of sleeve of one-opening shaft of hydrothermal type geothermal well and implementation process

A multi-layer thermal insulation, geothermal well technology, applied in casings, wellbore/well components, drilling pipes, etc., can solve the problems of temperature reduction and dissipation, and achieve the effect of ensuring efficient utilization

Pending Publication Date: 2021-04-09
陕西省煤田地质集团有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiencies of the existing technical solutions, the present invention proposes a multi-layer thermal insulation structure and construction method of a hydrothermal geothermal well-opening shaft casing, the purpose of which is to overcome the problem of temperature reduction caused by heat loss during the water extraction process of the hydrothermal geothermal well. problems, effectively guarantee the productivity of geothermal wells and the efficient comprehensive utilization of geothermal systems

Method used

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  • Multi-layer heat preservation structure of sleeve of one-opening shaft of hydrothermal type geothermal well and implementation process
  • Multi-layer heat preservation structure of sleeve of one-opening shaft of hydrothermal type geothermal well and implementation process
  • Multi-layer heat preservation structure of sleeve of one-opening shaft of hydrothermal type geothermal well and implementation process

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Effect test

Embodiment 1

[0049] Such as figure 1 Shown, a kind of hydrothermal type geothermal well-wellbore casing multi-layer thermal insulation structure, comprises inner layer casing 3 and the outer layer casing 4 that is coated with nano airgel layer 5 outside, and described inner layer casing 3 The annular gap between the outer casing 4 and the outer casing 4 is a vacuum interlayer 15, and the outer casing 4 is provided with a vacuum gauge 8 for detecting the vacuum degree of the vacuum interlayer, and the outer casing 4 is provided with a vacuum pumping The hole 6 is reserved for injecting hydrogen absorbing agent into the vacuum interlayer 15, the bottom of the vacuum interlayer 15 is provided with a diversion groove 11, and the heat preservation cement 19 enters the inner and outer casing vacuum interlayer 15 from the diversion groove. The heat-retaining cement 19 enters the vacuum interlayer 15 and returns to a height of 70m to seal the bottom of the inner casing 3 and the outer casing 4 to ...

Embodiment 2

[0060] Such as Figure 4 Shown, a kind of hydrothermal type geothermal well-open wellbore casing multi-layer thermal insulation structure implementation process, comprises the following steps:

[0061] Step 100, as soon as the geothermal well is started and drilled, the inner casing and the outer casing with the nano-airgel layer pre-coated on the outer layer and the suspension device are sequentially lowered in sections according to the pipe arrangement sequence;

[0062] Step 200, after opening the inner and outer casings and running them down, cement the well with insulating cement, and control the annular space of the inner and outer casings to return to the height of the insulating cement;

[0063] Step 300, put hydrogen absorbing agent in the vacuum interlayer between the inner casing and the outer casing in the first well opening section, vacuumize to reach the standard, and seal the reserved hole;

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Abstract

The invention relates to the technical field of geothermal shaft heat preservation, and discloses a multi-layer heat preservation structure of a sleeve of a one-opening shaft of a hydrothermal type geothermal well. The multi-layer heat preservation structure comprises an inner-layer sleeve and an outer-layer sleeve, wherein the outer surface of the outer-layer sleeve is coated with a nano aerogel layer; an annular gap between the inner-layer sleeve and the outer-layer sleeve is a vacuum interlayer; a vacuum meter is arranged on the outer-layer sleeve; a vacuumizing reserved hole is formed in the outer-layer sleeve; and a flow guide groove is formed in the bottom end of the vacuum interlayer; and heat preservation cement enters the vacuum interlayer from the flow guide groove. The invention further discloses an implementation process of the heat preservation structure. According to the first-layer heat preservation structure of the sleeve of the multi-layer heat preservation structure, the interlayer of the well sleeve which is through inside and outside at the one-opening shaft of the geothermal well is vacuumized, so that vacuum heat insulation and insulation are realized; and according to the second-layer heat preservation structure, the outer surface of a vacuum pipe is coated with nano aerogel for heat insulation and heat preservation, and the outer-layer heat preservation structure adopts heat preservation cement mortar for well cementation, so that the full-size multi-layer long-acting heat insulation and heat preservation effects of the one-opening shaft are achieved, and comprehensive-grade efficient utilization of high-grade geothermal resources is guaranteed.

Description

technical field [0001] The invention relates to the technical field of geothermal wellbore heat preservation, in particular to a hydrothermal geothermal well-open wellbore casing multi-layer heat preservation structure and an implementation process thereof. Background technique [0002] At present, in geothermal development, high-grade geothermal resources can be utilized cascade and comprehensively, that is, according to the water temperature requirements of the purpose, they are used in order from high to low for power generation, industrial drying, geothermal heating; medical treatment, bathing, greenhouse, breeding, Planting, agricultural irrigation, mineral spring reference, etc., in order to maximize the utilization of geothermal resources, rationalize energy utilization, and diversify demand. Therefore, efforts should be made to ensure the extraction of high-temperature geothermal resources in geothermal development. [0003] Affected by the natural temperature gradi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/00E21B33/13E21B36/00
CPCE21B17/00E21B33/13E21B36/003
Inventor 张晓宏罗娜宁张廷会陈娅鑫李静琴韩元红赵真
Owner 陕西省煤田地质集团有限公司
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