Coiled-Tubing-Deployed Shutoffs in Alaska With a Polymer Gel and Microfine Cement

A common problem in oil and gas wells is excess free gas or water production from only certain portions of the completed interval. A coiled-tubing-deployed profile-modification technique was developed primarily to shut off excess free-gas production from the heel of cased-and-perforated horizontal oil wells. The technique has also been used for water and gas shutoff in both vertical and horizontal wells in a variety of lower-completion types.

Introduction

Coiled-tubing work has a well-established track record in North Slope of Alaska oil fields involving several thousand interventions of various types. Fig.