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Fracturing method for transforming hot dry rock reservoir through nanometer emulsion

A nanoemulsion, dry hot rock technology, applied in chemical instruments and methods, earthwork drilling, drilling composition, etc., can solve the problem of reducing the complexity of artificial fractures, short-circuiting water injection wells and production wells, and enhancing plastic mechanical characteristics and other problems, to achieve the effect of improving heat recovery efficiency, increasing net pressure, and promoting the formation of branch fractures

Active Publication Date: 2019-08-27
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the deep burial of hot dry rock, its plastic mechanical characteristics are enhanced, which reduces the complexity of artificial fractures, which easily leads to the formation of short circuits between water injection wells and production wells, resulting in the phenomenon of "thermal breakthrough"

Method used

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  • Fracturing method for transforming hot dry rock reservoir through nanometer emulsion
  • Fracturing method for transforming hot dry rock reservoir through nanometer emulsion
  • Fracturing method for transforming hot dry rock reservoir through nanometer emulsion

Examples

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Comparison scheme
Effect test

Embodiment 1

[0040] The fracturing method of a nanoemulsion reformed hot dry rock reservoir in this embodiment comprises the following steps in sequence:

[0041] (1) choose hot dry rock development area, inject 100 cubic meters of slippery water fracturing fluid into described hot dry rock formation with a displacement of 0.5 cubic meters per minute in this area, to form main fractures;

[0042] (2) Injecting 100 cubic meters of nanoemulsions with a particle size of 50-200nm into the hot dry rock formation at a displacement of 0.5 cubic meters per minute, forming a plurality of microscopic fractures on the basis of the main fractures ; The nanoemulsion is formed by mixing and stirring the raw materials of the following parts by weight: 0.04 parts by weight of n-dodecane, 4 parts by weight of cetyltrimethylammonium chloride, 14 parts by weight of n-butanol and 40 parts by weight of water , the stirring rate is 300rpm, and the stirring time is 30min;

[0043] (3) Inject 30 cubic meters of ...

Embodiment 2

[0049] The fracturing method of a nanoemulsion reformed hot dry rock reservoir in this embodiment comprises the following steps in sequence:

[0050] (1) select the hot dry rock development area, inject 200 cubic meters of slick water fracturing fluid into the described hot dry rock formation with a displacement of 1.25 cubic meters per minute in this area, to form main fractures;

[0051] (2) Injecting 200 cubic meters of nanoemulsions with a particle size of 50-200nm into the hot dry rock formation at a displacement of 1.25 cubic meters per minute, forming a plurality of microscopic fractures on the basis of the main fractures ; The nanoemulsion is formed by mixing and stirring the raw materials of the following parts by weight: 0.06 parts by weight of n-dodecane, 5 parts by weight of cetyltrimethylammonium chloride, 16 parts by weight of n-butanol and 45 parts by weight of water , the stirring rate is 300rpm, and the stirring time is 35min;

[0052] (3) Inject 450 cubic me...

Embodiment 3

[0058] The fracturing method of a nanoemulsion reformed hot dry rock reservoir in this embodiment comprises the following steps in sequence:

[0059] (1) choose hot dry rock development area, inject 300 cubic meters of slippery water fracturing fluid into described hot dry rock formation with a displacement of 2.0 cubic meters per minute in this area, to form main fractures;

[0060] (2) injecting 300 cubic meters of nanoemulsions with a particle size of 50-200nm into the hot dry rock formation at a displacement of 2.0 cubic meters per minute, forming a plurality of microscopic fractures on the basis of the main fractures ; The nanoemulsion is formed by mixing and stirring the raw materials of the following parts by weight: 0.08 parts by weight of n-dodecane, 6 parts by weight of cetyltrimethylammonium chloride, 18 parts by weight of n-butanol and 50 parts by weight of water , the stirring rate is 300rpm, and the stirring time is 34min;

[0061] (3) Inject 60 cubic meters of ...

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Abstract

The invention relates to a fracturing method for transforming a hot dry rock reservoir through nanometer emulsion. The fracturing method comprises the following steps that fracturing fluid is poured to activate and communicate with a natural fracture system in hot dry rock at first, then, the nanometer emulsion is poured into the hot dry rock stratum, by utilizing the mesomechanics effect generated when the fine particles of the nanometer emulsion are poured into the hot dry rock, the rock generates a lot of microscomic fracture systems, and finally, temporary blocking steering fluid is poured, fractures are subjected to bridge blinding, and the fractures are forced to steer and divided into branch fractures; and the steps are performed by at least one time. According to the fracturing method, on the one hand, through the mesomechanics effect of the nanometer emulsion, the contact area of the nanometer emulsion and the natural fracture system in the hot dry rock is increased, and meanwhile, the new microscomic fracture systems are generated through the capillary force; and on the other hand, through the bridge blinding effect of the temporary material on the interiors of the fractures, the fracture interior net pressure is improved, the fractures are forced to steer, forming of the branch fractures is promoted, and by combining the two aspects, high-diversion multi-fracture forming can be facilitated.

Description

technical field [0001] The invention belongs to the technical field of petroleum and natural gas engineering exploitation, and in particular relates to a fracturing method for reforming hot dry rock reservoirs with nanoemulsions. Background technique [0002] Hot dry rock (HDR) refers to a dense and impermeable high-temperature rock mass with a buried depth of more than 3 km, an underground temperature of more than 150 °C, no water or a small amount of water. It is estimated that the thermal energy stored in hot dry rocks within 3-10 km of the earth's crust is equivalent to 30 times the energy stored in all oil, natural gas and coal in the world. The hot dry rock resources buried at a depth of 3-10 km can be equivalent to 856 trillion tons of standard coal. Therefore, hot dry rock energy is an efficient, low-carbon and clean energy recognized by the international community. [0003] Enhanced geothermal system (EGS) is an effective method to develop hot dry rock resources. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/267E21B33/13E21B49/00C09K8/508C09K8/66
CPCC09K8/508C09K8/66E21B33/13E21B43/267E21B49/00
Inventor 汪道兵秦浩李敬法韩东旭周福建孙东亮宇波
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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