Efficient low-temperature gel breaker for polymer fracturing fluid and preparation method thereof

Abstract

The invention relates to the technical field of gel breakers for fracturing fluids, and particularly discloses an efficient low-temperature gel breaker for a polymer fracturing fluid. The efficient low-temperature gel breaker comprises an agent A and an agent B. The agent A comprises 35-45 parts of a gel breaking main agent, 3-5 parts of a gel breaking main agent stabilizer, 45-65 parts of mineral oil, 1-2 parts of polyamide and 0.3-0.5 part of hydrogenated castor oil, and the gel breaking main agent is peroxide; the agent B comprises the following components in parts by weight: 5-10 parts of a gel breaking activator, 1-2 parts of an activation stabilizer, 15-20 parts of a gel breaking auxiliary agent, 5-10 parts of a gel breaking retarder, 3-5 parts of an emulsifier, 30-40 parts of white oil and 20-30 parts of water. Compared with a conventional gel breaker system, the low-temperature gel breaker has the advantages that the performance of gel breaking liquid is not reduced during construction, gel breaking is rapid and thorough after construction is completed, the low-temperature gel breaker has the dual functions of liquid construction performance protection and efficient gel breaking, and the problem of gel breaking at the low temperature of 0-50 DEG C is solved.

Description

technical field [0001] The invention relates to the technical field of gel breakers for fracturing fluids, in particular to a high-efficiency low-temperature gel breaker for polymer fracturing fluids and a preparation method thereof. Background technique [0002] The fracturing stimulation of low temperature oil and gas reservoirs has always been one of the important problems in the development of oil and gas fields. When the conventional water-based fracturing fluid gel breaker is used to break the fracturing fluid, due to the limitation of the formation temperature, it is difficult to break the gel after fracturing, and the viscosity of the hydration fluid is high, resulting in a low flowback rate of the liquid and damage to the formation. Severe, resulting in poor fracturing effect. However, when adopting the traditional technology, it is necessary to increase the amount of gel breaker, which not only increases the cost, but also tends to cause the fracturing fluid to br...

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Problems solved by technology

[0007] The invention provides a high-efficiency low-temperature gel breaker for polymer fracturing fluid and its preparation method to solve the problem that in the prior art, when the temperature is lower than 50°C, the gel-breaking effect of peroxide is obviously reduced, and it cannot be used as a gel-breaker. The problem

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