Acidic polymer fracturing fluid and preparation method thereof

Abstract

The invention discloses an acidic polymer fracturing fluid and a preparation method thereof, and belongs to the technical field of fracturing fluids for oil and gas field development. The acidic polymer fracturing fluid comprises the following components in percentage by mass: 0.25 to 0.60 percent of a polymer thickening agent, 1.0 to 2.0 percent of an anti-swelling agent, 0.2 to 0.5 percent of a discharge aiding agent, 0.3 to 0.7 percent of a cross-linking agent and the balance of water, wherein the cross-linking agent is a mixture of an acidic polymer delayed cross-linking agent and an acidic polymer cross-linking agent, and the mass ratio of the acidic polymer delayed cross-linking agent and the acidic polymer cross-linking agent is 1:2 to 1:3. The cross-linking time of the acidic polymer fracturing fluid can be adjusted between 30 to 120s, the acidic polymer fracturing fluid is higher in anti-swelling rate and proppant carrying capacity, low in rock core damage rate and high in gel breaking performance, the preparation method is simple and convenient in process, and the requirement of revamp for capacity increasing of oil and gas fields can be met.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field development, and in particular relates to an acidic polymer fracturing fluid and a preparation method thereof. Background technique [0002] Fracturing technology is an important production stimulation measure in the exploitation of oil and gas fields. The purpose of fracturing is to form fractures with a certain size and conductivity in the formation. The choice of fracturing fluid is critical, and the commonly used fracturing fluid is water-based fracturing fluid. [0003] The fracturing fluid of the guar gum fracturing system satisfies the needs of low-permeability oilfield fracturing technology, but the system has problems such as high guar gum residue content and high damage rate to the reservoir. The polymer fracturing fluid system has better viscosity-temperature characteristics and strong thickening ability, no residue, less damage to the formation, good jelly stability, and str...

AI Technical Summary

Problems solved by technology

The publication number is CN104371699A "An organoaluminum-zirconium crosslinking agent, preparation method and low-molecular polymer fracturing fluid" disclosed in the technical scheme. The organoaluminum-zirconium crosslinking agent is prepared by reacting the following raw materials in parts by weight: zirconium 15-25 parts of salt, 15-25 parts of aluminum salt, 150-250 parts of polyol, 75-85 parts of organic acid, 15-25 parts of gluconate, 55-65 parts of water; the organoaluminum-zirconium crosslinking agent has excellent Excellent high temperature resistance, good cross-linking effect at high temperature and high salinity; the fracturing fluid compounded with the cross-linking agent and polymer has stable gel under high temperature conditions, and has excellent sand-carrying ability, Gel breaking performance and shear resistance; however, the technical proposal does not mention how to control the crosslinking time and the control range of the organoaluminum zirconium crosslinking agent

[0004] "A high-temperature-resistant acidic polymer thickener and its preparation method and application" disclosed in the prior art with the publication number CN104109219A discloses a technical solution. The fracturing fluid system recorded in the technical solution consists of the following mass percentages: Component composition: 1% mixture of high temperature resistant acidic cross-linked polymer thickener and cross-linking agent, 0.5% drainage aid, 1-3% KCl, and the balance is water. The fracturing fluid does not adjust the cross-linking time. Adjustment, if the cross-linking proceeds quickly, the jelly will be formed instantly, which will increase the friction of the fracturing fluid, and the jelly will be thinned by high-speed shear in the fracturing tube, and the fracture-making and sand-carrying ability will become poor. If the cross-linking progresses too slowly, and the bottom layer is still not cross-linked, there will be a phenomenon of sand-out, resulting in construction failure

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