A kind of degradable fiber and its fracturing fluid and preparation method of the fracturing fluid

Abstract

The invention provides a degradable fiber, fracturing fluid with the same and a method for preparing the fracturing fluid. 50%-70% polyacid and 30%-50% polyhydric alcohol are subjected to polymerization reaction on the basis of the total weight of the degradable fiber at the temperature of 160-180 DEG C for 3-5 hours to obtain a polymer, and the polymer is subjected to jet flow, winding, wire drawing, secondary winding and shearing to obtain the degradable fiber. The fracturing fluid contains 0.10wt%-0.18wt% of the degradable fiber. The method for preparing the fracturing fluid with the degradable fiber includes the following steps of adding thickening agents and other reagents into water to obtain thickening agent aqueous solution; adding the degradable fibers into the thickening agent aqueous solution; and adding gel breakers and cross-linking agents into the thickening agent aqueous solution to obtain the fracturing fluid. The degradable fiber, the fracturing fluid and the method have the advantages that the degradable fiber can be used for preparing the fracturing fluid, accordingly, the sand carrying performance of the fracturing fluid can be improved, usage of the thickening agents for the fracturing fluid can be decreased, and formation damage can be reduced.

Description

technical field [0001] The invention relates to a degradable fiber, a fracturing fluid containing the same and a preparation method of the fracturing fluid, belonging to the technical field of petrochemical industry. Background technique [0002] The U.S. Energy Information Administration (EIA) predicts that the recoverable reserves of shale gas in China are 36.1×10 12 m 3 , far surpassing the United States, which ranks second in the world; the Ministry of Land and Resources announced in March 2012 that China's onshore shale gas geological reserves were 134.4×10 12 m 3 , the recoverable reserves are greater than 25.1×10 12 m 3 (excluding the Qinghai-Tibet region), the development prospect is attractive. [0003] Fracturing technology is the core technology of shale gas development. The performance of fracturing fluid is the most critical factor for the success of fracturing. At present, the commonly used fracturing fluid at home and abroad is water-based fracturing fl...

AI Technical Summary

Problems solved by technology

However, the common problems of this fracturing fluid include: 1. The width of the fracture is not enough, and it is difficult for the proppant to penetrate; 2. The sand-carrying capacity of the fracturing fluid is insufficient, and the proppant quickly precipitates in the mixed fluid and gathers at the bottom of the fracture near the wellbore; 3. 1. The amount of fracturing fluid thickener used is large, resulting in incomplete gel breaking of the fracturing fluid, more residues remaining in the formation, causing serious damage to the formation, etc., seriously affecting the fracturing effect

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