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A carbon dioxide acid fracturing method for ultra-deep well carbonate reservoir stimulation

A technology for carbonate rock reservoirs and carbon dioxide, applied in chemical instruments and methods, earthwork drilling, boreholes/well components, etc., can solve problems such as excessive consumption, reservoir damage to water resources, etc., and achieve low kinetic energy loss, High net pressure transmission efficiency and long-lasting effect of acid etching

Active Publication Date: 2022-07-19
新疆恒洲景业石油技术服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, conventional hydraulic fracturing technology also faces problems such as reservoir damage and excessive consumption of water resources, making it face great challenges and controversies in its promotion and application

Method used

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  • A carbon dioxide acid fracturing method for ultra-deep well carbonate reservoir stimulation
  • A carbon dioxide acid fracturing method for ultra-deep well carbonate reservoir stimulation
  • A carbon dioxide acid fracturing method for ultra-deep well carbonate reservoir stimulation

Examples

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Effect test

Embodiment 1

[0073] The above method was applied to acid fracturing a carbonate reservoir in a well in an oilfield in western China. The medium depth of the target reservoir is 6009.5m, the original formation pressure is 64.99MPa, and the latest static pressure test is 58.73MPa; the reservoir temperature is 143℃, and the average pore size is The average permeability is 0.33md; among them, the actual construction parameters of carbon dioxide acid fracturing in ultra-deep wells are as follows:

[0074] High viscosity fracturing fluid: liquid CO 2 +20%hydrochloric acid+2.5%CO 2 Thickening drag reducer + 1% atomization stabilizer;

[0075] Medium viscosity fracturing fluid: liquid CO 2 +20%hydrochloric acid+1.5%CO 2 Thickening drag reducer + 1% atomization stabilizer;

[0076] Low viscosity fracturing fluid: liquid CO 2 +20%hydrochloric acid+1%CO 2 Thickening drag reducer + 1% atomization stabilizer.

[0077] Actual construction parameters of carbon dioxide acid fracturing in ultra-deep...

Embodiment 2

[0084] The above method was applied to acid fracturing of a sandstone condensate gas reservoir in a well in an oilfield in western China. The target reservoir was 4320.8m deep. Some reservoirs were polluted due to the previous operation. Considering the characteristics of the condensate gas reservoir, the The technology of the invention carries out acid pressure deblocking operation on the target reservoir, so as to dredge the seepage channel, relieve the near-well pollution caused by the workover operation, and at the same time remove the oil plug of the near-well reverse condensate, so as to restore the production. Among them, the actual construction parameters of carbon dioxide acid fracturing in ultra-deep wells are as follows:

[0085] Medium viscosity fracturing fluid: liquid CO 2 +20%hydrochloric acid+1%CO 2 Thickening drag reducer + 1% atomization stabilizer;

[0086] Low viscosity fracturing fluid: liquid CO 2 +20%hydrochloric acid+0.6%CO 2 Thickening drag reducer...

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Abstract

The invention belongs to the technical field of carbon dioxide sequestration and oil and gas reservoir stimulation and reformation, and particularly relates to a carbon dioxide acid fracturing method for ultra-deep well carbonate rock reservoir reformation. The present invention adjusts CO by 2 The viscosity of the compound acid system is used to control the fluidity of the system. The concentration of 20% hydrochloric acid, CO 2 Thickening drag reducer and atomization stabilizer form acid solution, by adjusting CO 2 The amount of thickening and drag reducing agent is used to obtain acid solutions of different viscosities, high viscosity CO 2 The complex acid system is suitable for creating complex fractures at the end of the main fracture; medium viscosity CO 2 The compound acid system is suitable for creating complex fractures in the middle of the main fracture end; low viscosity CO 2 The composite acid system is suitable for creating complex fractures around main fractures in the near-well section. The method of the invention can effectively improve the complexity of the reservoir fractures, increase the volume of the fractures to meet the exploitation requirements, and at the same time, can further increase the effective action range of the artificial fractures, and can effectively improve the exploitation efficiency of oil and gas resources in carbonate reservoirs.

Description

technical field [0001] The invention belongs to the technical field of carbon dioxide sequestration and oil and gas reservoir stimulation and reformation, and particularly relates to a carbon dioxide acid fracturing method for ultra-deep well carbonate rock reservoir reformation. Background technique [0002] Acid fracturing reservoir stimulation technology has become one of the main technical means for exploration and development at home and abroad. With the deepening of the exploration and development process, the objects of acid fracturing are becoming more and more complex, such as ultra-low permeability / ultra-low permeability, special lithology, complex lithology, ultra-deep wells, etc., making acid fracturing more and more difficult and adaptable. is getting worse. At present, when acid pressing is carried out at home and abroad, the acid liquid system with hydrochloric acid as the main body is mostly used, and the H in the acid liquid is generally delayed by increasi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/27E21B43/16C09K8/74
CPCE21B43/26E21B43/164C09K8/74C09K8/725Y02P90/70
Inventor 罗攀登杨飞孟磊峰张杰贾巍然郭小合付美龙宋博余勇刚
Owner 新疆恒洲景业石油技术服务有限公司
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