Water production is a major problem for any oil and gas field. If not properly managed, unwanted water production will seriously impact the economics of a project through lost hydrocarbon production, reserves recovery and ever increasing treatment costs. It may cause major economic and operational problems for several reasons. It requires increased capacity of water separation and handling facilities, decreases hydrocarbon production, and results in large amounts of produced water that need to be disposed in an environmentally friendly manner. Some fields in Saudi Arabia use water injection for reservoir pressure maintenance, which makes water production and handling a necessity even at a relatively early stage of some of these fields life cycle. As drilling technology advanced in the past years, horizontal wells became the norm in many fields managed by Saudi Aramco, especially in the giant Ghawar filed, the largest oil filed in the world. Some of these wells started cutting water, and as the water cut increased the need to perform rigless water shutoff was needed due to the high demand and high cost of workover rigs.

This paper will highlight the methodology, equipment and procedure used in the first rigless horizontal WSO in South Ghawar area by Coiled Tubing (CT) intervention to isolate the water producing zone at the toe of the well with a through tubing inflatable packer and a cement cap topped with mud push and high viscosity gel to reduce the cement slumping effect.

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