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Thermal stimulation and chemical stimulation combined process for hot dry rock thermal reservoir

A technology of chemical stimulation and combined process, applied in drilling compositions, chemical instruments and methods, wellbore/well components, etc., can solve the problem of fast reaction between chemical stimulants and rock mass minerals, and enhance metal corrosion of chemical stimulants To solve problems such as corrosion, underground wells, casing string damage, etc., to achieve good stimulation effect, slow response speed, and weaken the effect of corrosion

Inactive Publication Date: 2018-04-20
JILIN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the high-temperature environment of thermal reservoirs, chemical stimulants react quickly with rock mass minerals and disappear near the wellbore, making it impossible to penetrate deep into thermal reservoirs
Moreover, high temperature will enhance the metal corrosion of chemical stimulants, which will easily cause damage to underground wells, casing strings, etc.

Method used

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  • Thermal stimulation and chemical stimulation combined process for hot dry rock thermal reservoir

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A. Inject the clean water from the reservoir 1 into the hot dry rock reservoir rock mass through the high-pressure pipeline 9 and the injection well 10. The injection pressure at the bottom of the construction pump well does not exceed the minimum principal stress of the rock mass, and the time is controlled to 2 days. The construction environment is 10°C;

[0031] B. Inject the clean water from reservoir 1, the HCl from HCl supply tanker 2 and the additive from additive tanker 3 into sand mixer 4 through high-pressure pipeline 9 and mix them. Calculate the amount added per 100 milliliters of water: 5 grams of HCl, high-temperature acidification 1 gram of corrosion inhibitor, 1 gram of iron ion stabilizer, 1.5 grams of high temperature foam stabilizer, 20 grams of acid and alkali resistant high temperature foam agent and 1 gram of clay stabilizer. The prepared acid solution is injected into the foam generator 6 through the sand mixer 4, and then the carbon dioxide is in...

Embodiment 2

[0041] A. Inject the clean water from the reservoir 1 into the hot dry rock reservoir rock mass through the high-pressure pipeline 9 and the injection well 10. The injection pressure at the bottom of the construction pump well does not exceed the minimum principal stress of the rock mass, and the time is controlled to 3 days. The construction environment is 15°C;

[0042] B. Inject the clean water from reservoir 1, the HCl from HCl supply tank car 2 and the additive from additive tank car 3 through high-pressure pipeline 9 into sand mixer 4 and mix them. The amount added per 100 milliliters of water is calculated: 8 grams of HCl, high-temperature acidification 2 grams of corrosion inhibitor, 1.5 grams of iron ion stabilizer, 1.5 grams of high temperature foam stabilizer, 20 grams of acid and alkali resistant high temperature foam agent and 1.5 grams of clay stabilizer. The prepared acid solution is injected into the foam generator 6 through the sand mixer 4, and then the carbo...

Embodiment 3

[0052] A. Inject the clean water from the reservoir 1 into the hot dry rock reservoir rock mass through the high-pressure pipeline 9 and the injection well 10. The injection pressure at the bottom of the construction pump well does not exceed the minimum principal stress of the rock mass, and the time is controlled to 3 days. The construction environment is 20°C;

[0053] B. Inject the clean water from reservoir 1, the HCl from HCl supply tanker 2 and the additive from additive tanker 3 into sand mixer 4 through high-pressure pipeline 9 and mix them. The amount added per 100 milliliters of water is calculated: 12 grams of HCl, high-temperature acidification 3 grams of corrosion inhibitor, 2 grams of iron ion stabilizer, 1.5 grams of high temperature foam stabilizer, 20 grams of acid and alkali resistant high temperature foam agent and 2 grams of clay stabilizer. The prepared acid solution is injected into the foam generator 6 through the sand mixer 4, and then the carbon dioxi...

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Abstract

The invention relates to a novel modification system and process of a hot-dry-rock thermal reservoir, characterized by the combination of two stimulation measure processes, thermal stimulation and chemical stimulation. The process is characterized in that a naturally present fracture network is destructed by thermal stimulation to enhance permeability, partial minerals, scale and obstruction in shafts and fractures are dissolved by the chemical stimulation, and flow guiding capacity of the fractures is further improved. The repeating of the process enables a larger range of thermal reservoirs to be modified. By using the process, the problem of the prior art that after thermal stimulation, part of the fractures are closed along with the rise of the temperature of a cooling area and the problem that that a chemical stimulant disappears nearby an injection location during its excess speed of reacting with rock minerals at high temperature are solved, and the process enables greatly reduction in the risk of frequent microseism in a reservoir modification process when compared to traditional hydrofracturing. The process is widely applicable to the modification of hot-dry-rock thermal reservoirs.

Description

technical field [0001] The invention relates to a reforming technology for developing hot dry rock thermal reservoirs, in particular to a thermal stimulation-chemical stimulation combined reforming system and reforming process for hot dry rock thermal reservoirs. Background technique [0002] Due to its clean, renewable and wide spatial distribution, geothermal resources have become the renewable and clean energy that countries around the world focus on research and development. According to the existing form of geothermal heat, it is mainly divided into two types: hydrothermal type and dry hot rock type. Among them, the hydrothermal type is mainly steam and liquid water, which is the main geothermal resource developed and utilized in the world at present. Hot dry rock is a hot rock mass without water or steam, mainly metamorphic rock or crystalline rock mass buried at a depth of 3-10km, and its temperature range is between 150-650°C. At present, hot dry rock geothermal re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/26E21B43/27E21B37/06C09K8/74C09K8/70C09K8/52
CPCC09K8/52C09K8/703C09K8/74E21B37/06E21B43/26E21B43/283
Inventor 冯波雷宏武许天福侯兆云吴永东那金鲍新华
Owner JILIN UNIV
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