Sealing and blocking device and method for geothermal holes only extracting heat rather than water

A plugging device and geothermal technology, applied in earthwork drilling, sealing/isolation, wellbore/well parts, etc., can solve problems such as drinking water pollution, achieve good fluidity, good plugging effect, and good construction performance Effect

Pending Publication Date: 2017-10-24
李建峰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] To sum up, the problem existing in the prior art is: if no effective plugging and other protection measures are taken during the drilling process, the underground hot water ...

Method used

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  • Sealing and blocking device and method for geothermal holes only extracting heat rather than water
  • Sealing and blocking device and method for geothermal holes only extracting heat rather than water
  • Sealing and blocking device and method for geothermal holes only extracting heat rather than water

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preparation example Construction

[0057] As a preferred embodiment of the present invention, the preparation method of the plugging material includes:

[0058] Step 1: Take 60-80 parts of Portland cement clinker, 10-20 parts of sulphoaluminate cement, 3-6 parts of bentonite, 0.2-0.5 parts of hydroxyethyl cellulose ether, and 30-20 parts of polymer emulsion according to mass percentage. 40 parts, 3-5 parts of plasticizer, 2-3 parts of defoamer, 0.5-1 part of thickener PRM-300, 20-25 parts of 8# quartz sand; mix and stir evenly to obtain an inorganic precipitation system for use ;

[0059] Step 2, in parts by mass, take 50-90 parts of resin, 0.5-4 parts of accelerator, 10-30 parts of first filler, and 10-30 parts of second filler; mix and stir evenly to obtain a polymer jelly system for use ;

[0060] Step 3: Take the inorganic precipitation system and the polymer jelly system at a ratio of 1:2 to 3.5 by volume.

[0061] As a preferred embodiment of the present invention, after the plugging material is prepar...

Embodiment 1

[0086] The plugging material includes an inorganic precipitation system and a polymer jelly system; the volume ratio of the inorganic precipitation system to the polymer jelly system is 1:2;

[0087] The inorganic precipitation system consists of 60 parts of Portland cement clinker, 10 parts of sulphoaluminate cement, 3 parts of bentonite, 0.2 parts of hydroxyethyl cellulose ether, 30 parts of polymer emulsion, plasticizer Agent 3, defoamer 2, thickener PRM-3000.5 parts, 8# quartz sand 20 parts;

[0088] The polymer jelly system is composed of a resin, an accelerator and a filler; the filler is composed of a first filler and a second filler; in parts by mass, 50-90 parts of a resin, 0.5-4 parts of an accelerator, and 0.5-4 parts of a first filler. 10-30 parts, 10-30 parts of the second filler.

Embodiment 2

[0090] The plugging material includes an inorganic precipitation system and a polymer jelly system; the volume ratio of the inorganic precipitation system to the polymer jelly system is 1:3.5;

[0091] The inorganic precipitation system consists of 80 parts of Portland cement clinker, 20 parts of sulphoaluminate cement, 6 parts of bentonite, 0.5 parts of hydroxyethyl cellulose ether, 40 parts of polymer emulsion, plasticizer 5 parts of agent, 3 parts of defoamer, 1 part of thickener PRM-300, 2025 parts of 8# quartz sand;

[0092] The polymer jelly system is composed of a resin, an accelerator and a filler; the filler is composed of a first filler and a second filler; in parts by mass, 50-90 parts of a resin, 0.5-4 parts of an accelerator, and 0.5-4 parts of a first filler. 10-30 parts, 10-30 parts of the second filler.

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Abstract

The invention belongs to the technical field of heat exchange of geothermal holes only extracting heat rather than water, and discloses a sealing and blocking device and method for the geothermal holes only fetching heat rather than water. A drilling slurry layer is arranged and fills the outer side of a casing pipe inside a drilled well, and the upper end of the drilling slurry layer is filled with a spacer fluid layer; the upper end of the spacer fluid layer is filled with a blocking material, and the upper end of the blocking material is filled with a spacer fluid layer; the blocking material can highly fill the annular gaps, and cement is low in flowing resistance and not prone to being leaked; the blocking material and drilling fluid are hardly mixed; and the thickening time of the blocking material is long and the mobility of the blocking material is good. As for the blocking method, the certain quantity of blocking material is injected to a certain portion of a hole with a drilling tool; the drilling tool is lifted out; and a casing pipe string is placed downhole into the blocking material to wait for solidification. The sealing and blocking device and method are more effective specific to small annular gaps or large annular gaps, are particularly suitable for sealing holes of guide pipes and casing pipes, meet the technical requirement of the heat supply technique of the geothermal holes only fetching heat rather than water, and effectively protect the blocking material for sealing holes and blocking water for pressure-bearing drinking water within 600 m underground.

Description

technical field [0001] The invention belongs to the technical field of heat exchange in geothermal holes that only take heat but not water, and in particular relate to a geothermal hole solid hole plugging device and method for only taking heat but not water. Background technique [0002] At present, the drilling depth of the geothermal hole heating technology that only takes heat and does not take water is 2100-3000m underground, and the geothermal hole heating technology that only takes heat and does not take water will penetrate the above different water layers during the drilling process. However, if protection measures such as effective sealing are not taken during the drilling process, the underground hot water in the hot water layer and other corrosive minerals will rush up to the drinking water layer along the borehole under the action of pressure, thereby causing drinking water pollution. In view of this situation, it is necessary to study and adopt scientific and e...

Claims

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Application Information

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IPC IPC(8): E21B33/13C04B28/06
CPCE21B33/13C04B28/06C04B7/02C04B14/104C04B24/383C04B24/24C04B2103/30C04B2103/50C04B2103/44C04B14/06C04B24/42C04B2103/0068
Inventor 李建峰
Owner 李建峰
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