This paper was a repeat presentation at the SPE Middle East Oil Technical Conference and Exhibition held in Bahrain, 3-6 April, 1993.


During 1991 ADMA-OPCO planned to drill two horizontal producers. It was also planned to measure the petrophysical properties of the horizontal sections by Logging While Drilling (LWD) and by conveying conventional open hole logs on drill-pipe under Tough Logging Conditions (TLC). Each well was suggested to be logged by different LWD contractor.

Bullheading the acid into the formation is very inefficient and not expected to stimulate more than a few feet of the horizontal section as the acid tends to spend near the top when it contacts the limestone formation. Thus, to allow uniform distribution of the acid in the horizontal sections, the coiled tubing was used to pump the acid into the formation while pulling ft out.

Batches of foam diverters were pumped at regular intervals to ensure proper diversion of the acid. During the pumping sequence, a diesel oil was pumped down the coiled tubing X production tubing annulus to prevent the injected fluids from travelling up the hole by creating a back pressure on the upper sections.

Part one of this paper reviewed the logging operations and compared the results of the two LWDs with the open hole logs and with the core analysis results.

Part two discussed the operational and efficiency aspects of stimulating an offshore horizontal well.

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