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Well cementation material for medium and deep layer geothermal well, preparation method of well cementation material, and geothermal well

A technology for geothermal wells and well cementing, which is applied in wellbore/well components, chemical instruments and methods, earthwork drilling and production, etc. It can solve the problems of poor thermal conductivity of cement and affect the utilization efficiency of geothermal energy, etc., so as to increase fluidity and prolong The initial setting time and the effect of improving utilization efficiency

Pending Publication Date: 2019-10-29
中国煤炭地质总局水文地质局
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) The technical problem to be solved by the present invention is: existing medium and deep geothermal wells adopt cement as well cementing material, and the thermal conductivity of cement is poor, which affects the utilization efficiency of geothermal energy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] This embodiment provides a cementing material for medium-deep geothermal wells, comprising the following components in parts by weight: 30-40 parts of water, 40-60 parts of cement, 10-25 parts of graphite powder, 5-15 parts of metal powder, 0.3-0.7 parts of water reducer, 0.2-0.5 parts of retarder.

[0023] The cementing material provided in this embodiment is mixed with cement, water, graphite powder, metal powder, water reducer and retarder, and the mixing of graphite powder, cement and water can increase the thermal conductivity of the cementing material. The embodiment of the present invention provides The thermal conductivity of the cementing material can reach 2.21-2.81W / m.k, which is about 2-5 times that of the existing cement. In this way, the thermal conductivity layer made of the cementing material can conduct heat better and improve the utilization efficiency of geothermal energy; at the same time Doping metal powder in the cementing material can improve the ...

example 1

[0028] The cementing material provided in this example includes 30 parts by weight of water, 40 parts by weight of cement, 10 parts by weight of graphite powder, 5 parts by weight of metal powder, 0.3 parts by weight of water reducer and 0.2 parts by weight of retarder; this example The preparation method of medium cementing material comprises the steps: S1, take 30 parts by weight of water and 40 parts by weight of cement, mix and stir evenly to form cement mortar; S2, take 10 parts by weight of graphite powder and 5 parts by weight of metal powder and add In cement mortar; S3, take 0.3 parts by weight of water reducer and 0.2 parts by weight of retarder and add them to the mixed solution in step S2 and stir evenly to form a cementing material.

[0029] The graphite powder mesh number described in this example is 200 mesh, and described metal powder is iron powder, and iron powder mesh number is 200 mesh, and described retarder is citric acid, and described cement is G grade o...

example 2

[0031] The cementing material provided in this example includes 35 parts by weight of water, 50 parts by weight of cement, 20 parts by weight of graphite powder, 10 parts by weight of metal powder, 0.3 parts by weight of water reducer and 0.5 parts by weight of retarder; this example The preparation method of medium cementing material comprises steps: S1, take 35 parts by weight of water and 50 parts by weight of cement, mix and stir evenly to form cement mortar; S2, take 20 parts by weight of graphite powder and 10 parts by weight of metal powder and add In cement mortar; S3, take 0.3 parts by weight of water reducer and 0.5 parts by weight of retarder and add them to the mixed liquid in step S2 and stir evenly to form a cementing material.

[0032] In this example, the graphite powder has a mesh size of 500 mesh, the metal powder is a mixture of aluminum powder and copper powder, the iron powder has a mesh size of 400 mesh, the retarder is tartaric acid, and the cement is gra...

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Abstract

The invention relates to the technical field of geothermal equipment, in particular to a well cementation material for a medium and deep layer geothermal well, a preparation method of the well cementation material, and the geothermal well. The well cementation material for the medium and deep layer geothermal well is prepared from water, cement, graphite powder, metal powder, a water reduction agent and a retarder which are in appropriate proportion. The well cementation material has good strength, thus the well cementation need can be met, meanwhile, the retarder is added in the well cementation material, thus the initial setting time of the well cementation material can be prolonged, and the construction requirements are met; flowability of the well cementation material can be optimizedthrough the water reduction agent, and thus liquidity is improved; and the strength, liquidity and initial setting time of the well cementation material meet the construction requirements, meanwhile,the heat conductivity coefficient of the well cementation material is 5-20 times that of the cement, and thus the utilization efficiency of geothermal energy can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of geothermal equipment, in particular to a cementing material for mid-deep geothermal wells, a preparation method thereof, and a geothermal well. Background technique [0002] As a renewable and clean energy, geothermal energy has the advantages of wide distribution, low cost, easy exploitation, cleanness and direct utilization. With the increasing awareness of environmental protection and the increasing shortage of energy, the rational development and utilization of geothermal resources has become more and more popular; at present, geothermal power generation is a relatively common way of utilization, and at the same time, geothermal energy is directly used for heating and heating. And hot water supply has become more and more attention to the direction of geothermal utilization; my country's use of geothermal heating and hot water development is also very rapid, and the mid-deep geothermal heating needs to...

Claims

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Application Information

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IPC IPC(8): C04B28/00C09K8/467E21B33/13
CPCC04B28/00C09K8/467E21B33/13C04B14/024C04B14/34C04B2103/302C04B2103/22
Inventor 宫萍萍李振兴刘岩陈印虎
Owner 中国煤炭地质总局水文地质局
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