Gel-Cement Combination Squeezes For Gas Shutoff

摘要

Gel-Cement Combination Squeezes have been successfully used for gas shutoff applications. Coupled with coiled tubing selective placement, gels and cements exhibit a synergistic gas shutoff effect. Gels provide an indepth block to gas production by forming a crosslinked polymer network withinrnthe porous media. Cements are able to fill voids and cavities to block gas production and provide a strong near wellbore block. Thirteen treatments have been performed to date with an economic success rate of 850/o. Implementation of the technology required the use of a well-controlled gel system,rnconsideration of possible contanunation issues and modification of current coiled tubing placement strategies.