Isolating liquid for front acid sand fracturing and preparation method thereof

Abstract

The invention relates to an isolating liquid for front acid sand fracturing and a preparation method thereof. The isolating liquid comprises the following components in parts by weight: 20-100 parts of organic ester, 0-1 part of water-in-oil emulsifying agent, 0-1 part of clay stabilizer and 0-100 parts of water, wherein the organic ester is a conventional ester substance such as ethyl acetate, butyl acetate or tributyl phosphate and the like; the water-in-oil emulsifying agent is one or a mixture of more than two of polyethylene glycol sorbitan oleate, sorbitan monostearate polyoxyethylene ether and sorbitan oleate ester; and the clay stabilizer is one or a mixture of two of dodecylamine acetic acid ammonia and chloridized dodecyl trimethylamine. On the premise of meeting the requirement of each engineering performance on innovation for increasing yield, the single well yield of an oil gas well is increased by performing front acid sand fracturing. The preparation method is easy and convenient to operate, raw materials have low costs, and the problem of gel breakage of fracturing fluid in the front acid sand fracturing process of an oil gas field is effectively solved.

Description

Technical field: [0001] The invention relates to a spacer fluid used in pre-acid sand fracturing stimulation measures in oil and gas fields and a preparation method thereof. Background technique: [0002] Sand fracturing has been widely used by major oil companies at home and abroad as a main technical means to increase single well production in oil and gas fields for a long time. However, there are a series of problems in the high-viscosity water-based fracturing fluid and proppant propping fractures used in conventional sand fracturing, which restrict the effect of increasing single well production: [0003] (1) There is damage to the reservoir and propped fractures caused by incomplete gel breaking of the fracturing fluid; [0004] (2) There are fracturing fluid residues remaining in support fractures or natural fractures and blocking damage to seepage channels in reservoir pores; [0005] (3) There is fracturing fluid leaking into the reservoir and causing damage to th...

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Problems solved by technology

[0019] Another object of the present invention is to provide a method for preparing spacer fluid for pre-acid sand fracturing, which is easy to operate and has low cost of raw materials, effectively solving the problem of gel breaking of fracturing fluid during pre-acid sand fracturing in oil and gas fields The problem

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