STAGED GEL BREAKING TECHNOLOGY IN HYDRAULIC FRACTURING TREATMENT

Hydraulic Fracturing Treatment is one of the most effective stimulation for reservoir development.Because the postfracture response will be influenced by hydrated fluid viscosity,solving the gel breaking problem of fracture fluid in fracture treatment is paramount important.This paper introduces the effect of reservoir temperature,breaking time,breaker concentration and others on gel breaking effectiveness.Experimental study has focused on decrease of breaking time and hydrated fluid viscosity,increase of clean up rate and minimization of reservoir damage.Results shows the more breaker concentration,the higher breaking temperature,and the longer breaking time,the lower hydrated fluid viscosity.This paper introduces a novel staged breaking technique,Field application result shews,comparative to conventional breaking technique the shut in time is decreased by 8h,clean up circle is decreased to 10.6 d and clean up efficiency is increased by 38%.