Clean crushing liquid system

Abstract

The invention provides a clean crushing liquid system fit for prolonging the low-temperature and low-permeability reservoir of oil field. The clean crushing liquid system comprises the following components by weight percent: 0.3%-0.4% of thickening agent, 0.15%-0.2% of synergist, 0.5%-1.0% of anti-swelling agent, 0.1%-0.3% of gel breaker and the balance of water, wherein the hydrophobic group modified polyacrylamide and / or derivatives thereof is served as the thickening agent. Compared with the prior art, the clean crushing liquid system has the advantages that the clean crushing liquid is not cross-linked and belongs to non-cross-linking crushing liquid; the construction friction resistance is low; the anti-shearing ability is strong; the content of the residues after the gel breaking is low; the harm to the floor layer is small; the formula of the crushing liquid is simple; the preparation process is simple and convenient; a large amount of manpower and material resources can be saved during a crushing construction process.

Description

technical field [0001] The invention belongs to the technical field of oil and gas reservoir fracturing reconstruction, and in particular relates to a clean fracturing fluid system. Background technique [0002] Hydraulic fracturing is an effective method to stimulate oil and gas reservoirs, and it is an important measure to increase production and injection of oil and gas wells and water injection wells. Hydraulic fracturing is the use of ground fracturing vehicles to inject liquid with a certain viscosity into oil and gas layers along the wellbore with sufficient pressure and large enough displacement. When the pressure and the liquid entering the oil and gas layer cause the stress on the rock somewhere on the well wall to exceed the strength of the rock, the oil and gas layer will begin to rupture and form fractures here. After the fracture has been extended for a period of time, continue to inject the sand-mixing fluid carrying proppant to expand and extend the crack an...

AI Technical Summary

Problems solved by technology

However, guar gum fracturing fluid belongs to the cross-linking system, and the content of guar gum insolubles is high, so the gel breaking is not complete and the residue content is high, which will cause great damage to the formation after flowback. Including guar gum thickeners, cross-linking agents, pH regulators, drainage aids, bactericides, clay stabilizers, gel breakers, etc., making guar gum fracturing fluids costly and complicated to prepare

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