Core samples examined from the Mission Canyon Formation, McKenzie County, North Dakota were subjected to Scanning Electron Microscopy/Energy Dispersive Spectroscopy (SEM/EDS) analysis. The interval of the core samples studied from well "A" were 9122–9125 feet, 9140–9143 feet and 9171–9174 feet. Those samples studied from well "B" were taken from intervals 9471–9474 feet and 9556–9559 feet. This preliminary study was carried out to evaluate the Mission Canyon formation for a successful stimulation treatment.

The Mission Canyon formation is predominantly fractured dense carbonate of the lower middle Mississippian and a member of the Madison group, see fig. 1. Problems have been encountered in stimulating the Mission Canyon due to a variety of factors. Out of many, a few important ones are the release of fines and their migration due to acid reaction, the presence of clay minerals and the availability of various other acid insoluable mineral assemblages.

A limited number of Mission Canyon cores were available for this study. This paper will discuss the in depth SEM/EDS analysis. Information is now available to aid in the selection of a more effective system to stimulate the Mission Canyon Formation. The effectiveness of a high strength, crosslinked hydrochloric acid system in various counties namely, Billings, Williams and McKenzie in North Dakota has been studied. Scrutiny of the crosslinked acid jobs pumped indicates that small volume jobs (1000-5000 gallons) in the Dickinson area using high strength (15%–20%) crosslinked hydrochloric acid at low rates, (4 to 8 barrels per minute) have been more successful, wheras large volume jobs have not produced encouraging results.

This paper will provide insight for optimizing acidizing systems that suspends fines and prevents their migration thus making stimulation in the Mission Canyon Formation more successful.

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