Composite osmotic acid liquor and preparation method thereof

A technology of acid liquid and penetrating agent, which is applied in the field of compound penetrating acid liquid and its preparation, can solve the problems of high friction resistance and low permeability, etc., and achieve the effects of increasing service life, improving permeability performance, and increasing construction displacement

Pending Publication Date: 2022-05-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem solved by the present invention is to overcome the disadvantages of low permeability and high friction of the existing acid solution, and provide a composite osmotic acid solution that can improve permeability and reduce friction during construction pumping

Method used

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  • Composite osmotic acid liquor and preparation method thereof
  • Composite osmotic acid liquor and preparation method thereof
  • Composite osmotic acid liquor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] The content of thickener is 0.1%, the content of penetrating agent is 0.3%, the content of retarder is 1%, the content of corrosion inhibitor is 3%, the content of iron ion stabilizer is 1%, the content of demulsification and drainage aid is 1%, The HCl concentration of the hydrochloric acid solution used to prepare the composite osmotic acid solution of this embodiment is 15%.

Embodiment 2

[0059] The content of thickener is 0.1%, the content of penetrating agent is 1%, the content of retarder is 1%, the content of corrosion inhibitor is 3%, the content of iron ion stabilizer is 1%, the content of demulsification and drainage aid is 1%, The HCl concentration of the hydrochloric acid solution used to prepare the composite osmotic acid solution of this embodiment is 15%.

[0060] When the liquid permeates in one direction, the hydrophilic layer is more hydrophilic, and when the thickness is larger, the driving force is greater, and it tends to have one-way permeation performance, and the difference in osmotic pressure between the forward and reverse directions is large, and the permeation speed is fast. When the hydrophobicity of the hydrophobic layer is weak and the thickness is thin, the permeation resistance is small, which is beneficial to one-way permeation. The enlarged pore size makes one-way permeation easier and faster. Investigate the composite osmotic a...

Embodiment 3

[0081] The content of thickener is 0.15%; the content of retarder is 10%; the content of penetrant is 1%, the content of corrosion inhibitor is 3%; the content of iron ion stabilizer is 1%; The HCl concentration of the hydrochloric acid solution used to prepare the composite osmotic acid in this embodiment is 10%.

[0082] The sample of Example 3 and 3 test coupons were taken, and the indoor coupon experiment was carried out according to the requirement of reservoir temperature, which was 120°C in this embodiment. According to the oil and gas industry standard "SY / T 5405- 1996 Performance Test Methods and Evaluation Indexes of Corrosion Inhibitors for Acidification" evaluated the corrosion inhibition performance of the system. The corrosion rate is calculated according to the formula:

[0083]

[0084] In the formula: v i —Single piece corrosion rate, g / (m 2 h);

[0085] Δt—reaction time, h;

[0086] Δm 1 —corrosion vector of the slice, g;

[0087] A i —The surface ...

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Abstract

The invention discloses a composite osmotic acid solution and a preparation method thereof, and the composite osmotic acid solution comprises: hydrochloric acid with a content of 5-20%; the content of the thickening agent is 0.1%-3.0%; the content of the penetrating agent is 0.3 percent to 5.0 percent; the content of the retarder is 1.0%-20%; the content of the corrosion inhibitor is 1.0%-10.0%; the content of the iron ion stabilizer is 1.0%-3.0%; the content of the demulsification cleanup additive is 0.5%-3.0%; the composite permeable acid liquor can overcome the problems of low acid liquor permeability, high acid liquor injection friction and high acid rock reaction speed in deep fracture-vuggy carbonate rock acid fracturing yield increase construction in the oil and gas development process.

Description

technical field [0001] The invention relates to the field of oil and gas development. Specifically, it is a composite osmotic acid solution and a preparation method thereof. Background technique [0002] In the process of oil and gas development, acid fracturing stimulation technology is the main production stimulation and production stabilization measure for carbonate reservoirs and complex lithology reservoirs and other oil wells to increase single well production. Effective measure of water injection volume. When the acid liquid is injected into the formation, the acid liquid can dissolve and create artificial fractures to reduce the drainage resistance, increase the formation permeability, and improve the oil and gas well recovery. The permeability of the acid solution is an important indicator, the better the permeability, the easier it is to create artificial fractures and increase the permeability of the formation. In addition, in the acid fracturing stimulation co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/54C09K8/72C09K8/74C09K8/88C08F220/34C08F220/56C08F226/10
CPCC09K8/74C09K8/725C09K8/54C09K8/882C09K8/885C09K8/887C08F220/34C09K2208/32C09K2208/10C09K2208/28C08F220/56C08F226/10
Inventor 罗攀登崔佳方裕燕张雄李永寿安娜赵兵张俊江耿宇迪宋志峰房好青马馨悦侯帆甄建伟
Owner CHINA PETROLEUM & CHEM CORP
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