Formula for preparing fracturing liquid by utilizing biological enzyme preparation

Abstract

The invention relates to a formula for preparing fracturing liquid by utilizing a biological enzyme preparation, and the biological enzyme is prepared by 0.2-0.5 percent of biological enzyme de-plugging agent by weight, a thickening agent, i.e. hydroxypropyl guar, a cross linking agent, i.e. borax, or an organic boron cross linking agent and a biological gel breaker, wherein the cross linking ratio of the cross linking agent is 100:5 or 100:0.25. The preparation has the advantages of good environment protection property, super activity and catalytic force, small usage amount, convenient use, enhanced efficiency, no residue after gel breaking, long action time under a stratum, good recovery and stability function on stratum rock cores, water-solubility, good wetting effect, simple and convenient operation, simple field construction equipment, and the like, is suitable for an oil well with a pH value from 4 to 10, and is favorable to accelerating the movement of water molecules.

Description

technical field [0001] The invention relates to a formula of chemical reagents, in particular to a formula for preparing fracturing fluid by utilizing biological enzyme preparation. Background technique [0002] At present, in order to improve the ultimate recovery of oilfields, many production stimulation measures are taken in the development, among which oil reservoir fracturing to improve the porosity and permeability of oil reservoirs is one of the main production stimulation measures, especially in low permeability oilfields, due to the porosity and permeability of rock formations If the fracturing rate is low, it cannot be put into production without fracturing. The fracturing stimulation method is feasible, but different fracturing techniques have different effects and defects. For example, fracturing and acidification have a certain stimulation effect, but Corrosion of the oil well pipe string is relatively large, which reduces the service life of the oil casing, cau...

AI Technical Summary

Problems solved by technology

[0003] The original gel breaking system is ammonium persulfate, potassium persulfate, etc. Additives include drainage aids, demulsifiers, active agents and bactericides, etc. The existing problems are: slow speed, not environmentally friendly, many residues, large damage, and types of agents Many, poor coordination

After our research and demonstration, there may be three major damage problems in fracturing in Yanchang Oilfield: cold damage, water damage and residue damage, which restrict the efficiency of fracturing stimulation

[0006] 3. Residue damage: Guar gum breaks slowly, incompletely, and has many residues