Resistance reduction agent for oil well fracturing and preparation method of resistance reduction agent

Abstract

The invention provides a resistance reduction agent for oil well fracturing. The resistance reduction agent for oil well fracturing comprises components A and components B., and the ratio of the components A to the components B is 20:80. The components A comprise 25-37.5 parts of acrylamide, 5-50 parts of hydrophilic monomers, 2.5-10 parts of sodium hydroxide, 1.25 parts of persulfate and 150.25-215.25 parts of water. The components B comprise 450-880 parts of hydrophobic monomers, 100-400 parts of spans, 10-100 parts of alkylphenol ethoxylates and 10-50 parts of alcohol amine salt type anionic fluorocarbon surfactants. Raw materials of the resistance reduction agent are easy to obtain, the preparation technology is simple, water solubility is good, friction resistance is reduced by more than 60%, the interface tension is below 10-2 mN / m after gel breaking, when the resistance reduction agent is used, fast flowback can be achieved while no discharge adding agent needs to be added, and wide application prospects are achieved.

Description

technical field [0001] The invention belongs to the research field of chemical agents for deep well and low permeability fracturing, and in particular relates to a drag reducing agent for oil well fracturing and a preparation method thereof. Background technique [0002] In stratum reconstruction, fracturing is generally adopted in order to increase the expansion of channels and seepage area. With the development of oilfields, more and more deep wells and low-permeability wells are reconstructed. Due to deep burial and compact formation, fracturing During the transformation, the flow resistance of the liquid in the pipeline is relatively high, resulting in excessive pressure, which reduces the construction efficiency and affects the normal construction. In order to reduce the friction of the fracturing fluid in the pipe string and achieve the purpose of effective fracturing, Add drag reducing agent in fracturing; the prior art generally utilizes the thickening effect of high...

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Problems solved by technology

[0002] In stratum reconstruction, fracturing is generally adopted in order to increase the expansion of channels and seepage area. With the development of oilfields, more and more deep wells and low-permeability wells are reconstructed. Due to deep burial and compact formation, fracturing During the transformation, the flow resistance of the liquid in the pipeline is relatively high, resulting in excessive pressure, which reduces the construction efficiency and affects the normal construction. In order to reduce the friction of the fracturing fluid in the pipe string and achieve the purpose of effective fracturing, Add drag reducing agent in fracturing; the prior art generally utilizes the thickening effect of high molecular weight polymer to achieve drag reducing effect. In summary, the current drag reducing agents all have the following disadvantages: , the interfacial tension is high, which is not conducive to flowback. In order to improve the flowback efficiency of the gel breaking solution, it is often necessary to add a drainage aid

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