Supercritical carbon dioxide cracking technology

A carbon dioxide and supercritical technology, applied in the production of bulk chemicals, chemical instruments and methods, and production fluids, etc., can solve the problems affecting the physical properties of fracturing fluids and jet fracturing effects, and the complex laws of supercritical carbon dioxide fracturing fluid throttling effects. , temperature drop and other problems, to achieve the effect of good sand-carrying performance, low fracturing cost, and inhibition of clay expansion

Inactive Publication Date: 2017-08-18
新疆东大本源石油技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Supercritical carbon dioxide fracturing fluid is a mixture of viscosifiers dissolved in supercritical carbon dioxide; the fracturing fluid flowing through the jet fracturing device will produce a throttling effect, resulting in a drop in temperature, affecting the physical properties of the fracturing fluid and the jet fracturing effect
At present, affected by temperature,

Method used

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Examples

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preparation example Construction

[0024] The preparation method of described supercritical carbon dioxide fracturing fluid system, comprises the steps:

[0025] S101: Firstly, carbon dioxide is heated to above 31.3° C. and pressurized to above 7.38 MPa to obtain supercritical carbon dioxide.

[0026] S102: Mix the arachidic acid, the behenic acid, the lignin acid, the pearl fatty acid, the oleic acid, and the glycerin to obtain a mixture, and then add 1% to 3% of the mixture by mass % concentrated sulfuric acid, heated to 105°C-120°C under stirring conditions, and kept for 2h-4h, then centrifuged and filtered to obtain the filtrate.

[0027] S103: Mix the filtrate with the remaining raw material components and the supercritical carbon dioxide to obtain a supercritical carbon dioxide fracturing fluid system.

[0028] Another object of the present invention is to propose the jet fracturing method of the supercritical carbon dioxide fracturing fluid system.

[0029] The method for jet fracturing of the supercri...

Embodiment 1

[0036] Embodiment 1 proposes a supercritical carbon dioxide fracturing fluid system, including the following raw materials in parts by weight: 75 parts of supercritical carbon dioxide, 0.1 part of arachidic acid, 0.01 part of behenic acid, 0.01 part of lignin acid, and 0.01 part of pearlescent fatty acid 0.5 part of oleic acid, 1 part of glycerin, 0.01 part of cyclopentane, 0.001 part of cyclohexane, 0.1 part of dichloromethane, 0.001 part of chloroform, 0.1 part of 1,2-dibromobutane, 1-bromobutyl 0.01 part of alkane and 0.01 part of 2-chloropropane.

[0037] The preparation method of the supercritical carbon dioxide fracturing fluid system of embodiment 1 comprises the steps:

[0038](1) First, heat carbon dioxide to above 31.3°C and pressurize to above 7.38MPa to obtain supercritical carbon dioxide;

[0039] (2) Mix the arachidic acid, the behenic acid, the lignin acid, the pearlescent fatty acid, the oleic acid and the glycerin to obtain a mixture, and then add 1% of the m...

Embodiment 2

[0047] Embodiment 2 proposes a supercritical carbon dioxide fracturing fluid system, including the following raw materials in parts by weight: 95 parts of supercritical carbon dioxide, 0.01 part of arachidic acid, 0.5 part of behenic acid, 0.001 part of lignin acid, and 0.1 part of pearlescent fatty acid 0.01 part of oleic acid, 8 parts of glycerin, 0.001 part of cyclopentane, 0.01 part of cyclohexane, 0.01 part of dichloromethane, 0.01 part of chloroform, 0.01 part of 1,2-dibromobutane, 1-bromobutyl 0.5 part of alkane and 0.001 part of 2-chloropropane.

[0048] The preparation method of the supercritical carbon dioxide fracturing fluid system of embodiment 2, comprises the steps:

[0049] (1) First, heat carbon dioxide to above 31.3°C and pressurize to above 7.38MPa to obtain supercritical carbon dioxide.

[0050] (2) The arachidic acid, the behenic acid, the lignin acid, the pearlescent fatty acid, the oleic acid and the glycerin are mixed to obtain a mixture, and then 3% o...

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Abstract

The invention relates to a supercritical carbon dioxide cracking technology. A supercritical carbon dioxide cracking liquid system is prepared from the following raw materials of supercritical carbon dioxide, arachidic acid, behenic acid, lignoceric acid, heptadecanoic acid, oleic acid, glycerin, cyclopentane, cyclohexane, dichloromethane, trichloromethane, 1,2-dibromobutane, 1-bromobutane and 2-chloropropane. The supercritical carbon dioxide cracking liquid system has the advantages that the preparation technology is simple, the number of operation procedures is fewer, the cracking cost is low, the effect is good, the sand carrying property is good, the water phase is small, the cracking with small water amount is realized, the damage of water phase to reservoir layer is effectively reduced, and the clay expansion is inhibited to a great degree; the construction time is effectively shortened, and the working intensity is decreased; compared with the traditional cracking type, the liquid residue is greatly reduced, and the environment-friendly and green construction purpose is realized at high efficiency.

Description

technical field [0001] The invention relates to a supercritical carbon dioxide fracturing process. Background technique [0002] Supercritical carbon dioxide jet fracturing is to generate supercritical carbon dioxide jets through jet fracturing devices, shoot through casing and reservoir rocks, form perforation holes, and then perform fracturing. The characteristics of supercritical carbon dioxide jet fracturing are: no free water, transporting proppant to form support fractures, no free water and solid residue in the support fractures, it is completely suitable for water-sensitive reservoirs, and eliminates reservoir damage. Therefore, supercritical carbon dioxide jet fracturing can improve the conductivity of reservoirs and is one of the effective means to achieve high-efficiency commercial exploitation. Supercritical carbon dioxide fracturing fluid is a mixture of viscosifiers dissolved in supercritical carbon dioxide; the fracturing fluid flowing through the jet fractur...

Claims

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Application Information

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IPC IPC(8): C09K8/62E21B43/26E21B43/16
CPCC09K8/62E21B43/164E21B43/26Y02P20/54
Inventor 冯兴凯宝森磊李志东
Owner 新疆东大本源石油技术有限公司
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