Chemical Process Seals Leaks In Injection Wells
R. Clay Cole, Dwyann Dalrymple, C.H. McDuff, & Mark Jones, Halliburton Services
A chemical gel has been developed to plug leaks in injection wells to provide effective zone isolation and casing protection. Since it is a gel material, the sealant can easily be removed from the casing-tubing annulus for workover operations. This chemical forms a thick gel after placement in seal casing leaks, (2) protect fresh water aquifers from the annulus which helps (1) steel casing from corrosion, and (4) can be removed from contamination, (3) protect the casing-tubing annulus by rotating and reciprocating the tubing and washing out. Chemicals used in this process are nontoxic and are compatible with fresh water aquifers. Field case histories are presented to show operational procedures and injection pressures before and after treatment and to illustrate effectiveness of the treatment.