Fracturing process in oil and water well by means of biological enzyme preparation

Abstract

The invention discloses an oil field oil-water well fracturing craft method of biological enzyme agent, which is characterized by the following: building the mixed biological enzyme agent and water or biological acid or antisludging agent or liquid nitrogen as fracturing fluid; forcing the fracturing fluid into the oil well or water well through the fracturing vehicle; pressing the fracturing fluid into the crack; opening the well after 72 hours. The biological enzyme agent penetrates the hole throat then enters into the microscopic hole gap, which attaches the rock surface and denudes the raw oil to improve the earth penetration factor. The method improves the water wet effect and washes the spalling oil film, which improves the recovery factor of raw oil.

Description

1. Technical field

[0001] The invention relates to a method for fracturing oil-water wells in oilfield development, in particular to a process for fracturing oil-water wells in oilfields using biological enzyme preparations. 2. Background technology

[0002] At present, in order to improve the ultimate recovery of oilfields, many stimulation measures are taken in the development, among which oil layer fracturing to improve the porosity and permeability of the oil layer is one of the main production stimulation measures. The fracturing stimulation method is feasible, but different fracturing methods The process has different effects and also has different defects, such as fracturing and acidizing, which has a certain effect of increasing production, but the corrosion of the oil well string is relatively large, which reduces the service life of the oil casing, causes collapse of the formation, and causes old formation plugging The effect of fracturing and sand squeezing is als...