Salt sequences that occur in the Williston Basin pose numerous drilling and completion problems. Probably the most severe of these is the collapse of the casing caused by the plastic flow of the salt. Over the years it has been observed that a high percentage of these collapse problems have occurred in the top part of the washed out salt section. In these cases, a typical bond log showed good-to-excellent bond across the salt with poor-to-no bonding at the top of the salt section where collapse occurred.

This paper describes work done in the Stony Creek Field of North Dakota with the objective of eliminating the area of poor bonding at the top of the washed out salt sections. The Stony Creek Field was discovered in 1987 with the Mission Canyon formation being the primary producing horizon. A new cement system is described which was placed across the primary sections of three wells. Bond logs were run comparing the results of the new cement system to that of a conventionally cemented well. The results showed the new system to be successful in eliminating the bonding problems in the top of the salt zone. To date, the wells have not experienced collapse problems.

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