A kind of fracturing fluid based on non-metal ion crosslinking agent and its preparation method and application

Abstract

The invention provides a fracturing fluid based on a nonmetallic ion crosslinking agent as well as a preparation method and application of the fracturing fluid. The fracturing fluid comprises the following components by weight percent: 0.07%-0.1% of a synthetic polymer, 0.1%-0.5% of a crosslinking agent, 0.01%-0.2% of a crosslinking promoter, 0.01%-0.2% of a pH regulator, 0.1%-1.0% of dodecyl ammonium chloride, 0.1%-0.3% of a demulsifier SP169, 0.01%-0.1% of ammonium persulfate, 0.1%-0.8% of formaldehyde and the balance of water. According to the fracturing fluid, the cost and the residue content of the fracturing fluid can be reduced; the fracturing fluid has the characteristics of high temperature resistance, shear resistance and complete gel breaking.

Description

technical field [0001] The invention relates to a fracturing fluid based on a non-metallic ion crosslinking agent, a preparation method and application thereof, and belongs to the technical field of petroleum exploitation additives. Background technique [0002] In the field of oil and gas exploitation, in the prior art, hydraulic fracturing is an important technical measure for increasing production of oil and gas wells and increasing injection of water wells. When the surface high-pressure pump group injects high-viscosity liquid into the well with a displacement that greatly exceeds the absorption capacity of the formation, and accumulates a pressure near the bottom of the well that exceeds the formation stress near the well wall and the tensile strength of the rock, cracks will form in the formation . As the high-viscosity liquid with proppant is injected into these fractures, these fractures will gradually extend forward, thus forming a plurality of sand-filled fractur...

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Problems solved by technology

[0005] (1) Guar gum is a natural polymer compound with a high content of water-insoluble substances and the market price of guar gum fluctuates greatly, and the source is limited, so it is gradually difficult to meet the requirements of low cost and low damage of fracturing fluid;

[0006] (2) The concentration of the thickener used is relatively high, which increases the operating cost on the one hand and increases the residue content on the other hand;

[0007] (3) At present, inorganic metal or organometallic compounds are mainly used as cross-linking agents and cross-linked under alkaline conditions, which inevitably introduces high-valent metal ions into the formation and causes secondary damage to the formation;

[0008] (4) Reduce the concentration of the thickener, and the temperature and shear resistance of the fracturing fluid will deteriorate

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