METHOD FOR TEMPORARILY ISOLATING A WELL INTERVAL, METHOD FOR REPEATED HYDRAULIC FRACTURING OF A FORMATION AND METHOD FOR KILLING A WELL

摘要

A method is proposed for temporarily isolating a well interval comprising: injecting a first suspension into the well, said first suspension containing a viscous carrier fluid, degradable particles and degradable fibres until a first filtering layer is formed; injecting a second suspension into the well, said second suspension containing a viscous carrier fluid, non-degradable particles and degradable fibres until a second filtering layer is formed. The first suspension and the second suspension do not mix when injected into a well. For optimum isolation of an interval, the ratio of the volume of the first suspension to the volume of the second suspension is from 1:5 to 2:1. A method for repeated hydraulic fracturing in an interval having a plurality of hydraulic fractures, and a method for reduced-impact killing of a well are also proposed. The technical result is the absence of clogging of a well and degradation of the isolating layer.