Recyclable cleanout fluids

摘要

A method for treating a wellbore or a subterranean formation penetrated by a wellbore includes preparing a gelled oil at the surface, introducing the gelled oil into the wellbore, recovering the gelled oil at the surface, adding a base to the gelled oil to reduce the viscosity, allowing entrained solids to settle out, adding an acid to increase the viscosity, and re-injecting the gelled oil.

主权项

1. A method of treating a subterranean formation penetrated by a wellbore comprising:
preparing a gelled oil at the surface, performing a first cycle comprising injecting the gelled oil into a well through coiled tubing, recovering the gelled oil at the surface, reducing the viscosity of the recovered oil by adding a first pH-adjusting agent, treating the resulting fluid having reduced viscosity, increasing the viscosity of the treated fluid by adding a second pH-adjusting agent to reestablish the gel, and starting a second cycle by re-injecting the gelled oil into the well through coiled tubing.