Lessons learned from CT stimulation of sour gas-producing wells at Ghawar field ///

Coiled tubing (CT), acid stimulation interventions in openhole, multilateral wells represent one of the industry’s most challenging scenarios. Factors, such as a corrosion, CT limitations, steering tool assemblies and fluid placement, all require innovative solutions to maximize well productivity. In recent years, the number of openhole, multilateral wells drilled in Saudi Arabia has increased significantly. Consequently, this initiative has also increased the requirements for performing acid stimulations, and for enhancing well productivity. A solution to this problem needs to address the corrosion challenges associated with pumping high acid concentrations, in sour and high-temperature environments; reaching target depths, in multiple laterals, with complex well architectures; the use of effective steering tool assemblies to access multiple laterals; and the placement of acid stimulation fluid systems in target zones, across the open holes, to maximize well productivity. This article documents the engineering solutions developed to address these specific challenges.

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