The objective of most acid stimulation treatments in Saudi Arabia’s Khuff carbonate formations is to remove drilling induced damage and achieve maximum well productivity. Open hole and multilateral completed wells, present several challenges that prevent an optimum intervention and placement of fluids with coiled tubing (CT). Traditional stimulation practices of these types of producers usually involve spotting fluid systems comprising multiple stages of pre-flushes, acid, and chemical diverting agents along the horizontal section of a well without adequate control over treating fluids’ placement and displacement.

An innovative approach, combining fiber optic enabled coiled tubing (FOECT) and distributed temperature survey (DTS) recorded data with reservoir data to selectively place stimulation fluids in targeted formation sections, was successfully field tested in a dual-lateral horizontal gas well completed open hole in Saudi Arabia.

This paper describes the job design, the operations performed to access the desired lateral, and the stimulation treatment performed combining the two technologies. Details on how the DTS technology was used to identify thief zones during the actual stimulation treatment, and how the placement of treatment fluids was optimized along the horizontal section, are also provided. The successful implementation of the first field trial has provided a strong incentive to utilize a similar approach in other gas producers currently scheduled.

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