A kind of oil washing agent for oil well fracturing and its preparation method and application

An oil washing agent and oil well technology, applied in chemical instruments and methods, drilling compositions, etc., to achieve high oil washing efficiency, good oil washing effect, and improved oil washing efficiency

Active Publication Date: 2019-06-14
北京斯迪莱铂油气技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the oil recovery technology is constantly developing and improving, there is no precedent for effectively combining the spontaneous imbibition phenomenon of tight oil reservoirs with fracturing technology, and there is still an urgent need for methods to improve oil washing efficiency and fracturing efficiency, especially For the development of unconventional oil wells

Method used

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  • A kind of oil washing agent for oil well fracturing and its preparation method and application
  • A kind of oil washing agent for oil well fracturing and its preparation method and application
  • A kind of oil washing agent for oil well fracturing and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0058] at 2m 3 Add 600kg of tap water, stir at room temperature, add 50kg of dihexadecyl dimethyl ammonium bromide (Yixing Chemical Factory) at one time, nonylphenol polyoxyethylene ether-10 (OP-10) (Guangzhou Ruiyang Surfactant Co., Ltd.) 50kg, after stirring for 30 minutes, add 300kg of sodium dodecyl benzene sulfonate (Guangzhou Ruiyang Surfactant Co., Ltd.), and continuously stir for 30 minutes to obtain the cleaning agent of the present invention. Oil products.

[0059] Take an appropriate amount of this oil washing agent product and add it to the fracturing fluid (containing hydroxypropyl guar: 0.05wt%-0.15wt%; clay stabilizer: 0.3wt%-1.2wt%; drainage aid: 0.3wt%- 1.0 wt%; and water), so that the concentration of the wash oil is 0.1 wt%. The interfacial tension of the fracturing fluid was measured by an automatic surface tensiometer K100C (KRUSS, Germany), which was 3 mN / m, and the contact angle was measured by a contact angle measuring instrument JC2000C (Shanghai Zho...

Embodiment 2

[0070] at 2m 3 In the reaction kettle of 500kg, add 500kg oil field re-injection water, stir at room temperature, add dihexadecyl dimethyl ammonium bromide 50kg at one time, OP-1050kg, stir after 40 minutes, add 300kg sodium petroleum sulfonate (Zhejiang Shaoxing County Nanfang Petrochemical Co., Ltd.), stirring continuously for 30 minutes to obtain the oil-washing agent product of the present invention.

[0071] The oil washing agent product is taken and added to the fracturing fluid, so that the concentration of the oil washing agent is 0.1 wt %. The interfacial tension of the fracturing fluid was measured to be 4.5 mN / m and the contact angle was 12°. The fracturing fluid was added to the oil washing device containing the same batch of saturated cores as in Example 1 (core parameters: sandstone, diameter 24.99mm, length 49.98mm, permeability 1.1346mD, porosity 12.83%), and after imbibition for one week The oil wash rate is 38%.

Embodiment 3

[0073] at 2m 3 Add 500kg of tap water, stir at room temperature, add 80kg of dihexadecyl dimethyl ammonium bromide at one time, fatty alcohol polyoxyethylene (7) ether (AEO-7) (Guangzhou Ruiyang) After 50kg of surfactant Co., Ltd. was stirred for 20 minutes, 300kg of octyl sulfonate (Guangzhou Ruiyang Surfactant Co., Ltd.) was added, and the mixture was continuously stirred for 40 minutes to obtain the oil-washing product of the present invention.

[0074] Take an appropriate amount of the oil washing agent product and add it to the fracturing fluid, so that the concentration of the oil washing agent is 0.12 wt %. The interfacial tension of the fracturing fluid was measured to be 5.2 mN / m and the contact angle was 18°. The fracturing fluid was added to the oil washing device containing saturated core (core parameters: carbonate rock, diameter 25.02 mm, length 50.33 mm, permeability 0.1637 mD, porosity 8.31%), and the oil washing rate after imbibition for one week was 31%.

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Abstract

The invention provides an oil washing agent for oil well fracturing. The oil washing agent comprises a sulfonate type anionic surfactant, a cationic Gemini surfactant, a polyoxyethylene ether type nonionic surfactant and water. The oil washing agent has the characteristics of simple formula, easy preparation, low surface tension, good compatibility with fracturing fluid, high economy and efficiency, and the like, and can achieve excellent oil washing effect by adding a small amount (about 0.1 wt%) to the fracturing fluid. The invention also provides a preparation method and application of the oil washing agent.

Description

technical field [0001] The invention relates to the technical field of petrochemical industry, in particular to an oil washing agent used in oil well fracturing and a preparation method and application thereof. Background technique [0002] my country is rich in unconventional oil and gas resources, and its exploration and development has attracted more and more attention. Unconventional reservoirs have small pores and large capillary force. In the process of waterflooding development of fractured low-permeability reservoirs, appropriate surfactants are usually added to reduce interfacial tension, wetting reversal, emulsifying and dispersing, etc. The water in the fracture replaces the crude oil in the matrix under the action of capillary force, which is called imbibition. [0003] For tight oil reservoirs, large-scale volume fracturing is one of the key technologies for the successful development of tight oil and gas reservoirs. During the process, a large amount of fractu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/584
CPCC09K8/584
Inventor 薛世杰李永平侯向前骆敏
Owner 北京斯迪莱铂油气技术有限公司
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