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• W2022758667 abstract "Abstract Short radius re-entries are very common in Saudi Aramco. Short radius is the fastest and generally most cost effective way to deliver reentry wells whenever vertical wells are converted into horizontal wells. A casing leak across Arab-C formations is a common problem in some onshore fields. Arab-C formation is a high-pressure water bearing zone. Arab-C is located right above the cap rock of the pay zone. When leaks develop, water starts to flow from the high pressure zone to the pay zone (downhole cross flow) and the well will stop producing oil. This paper will describe the use of expandable casing clad to repair wells with casing leaks across the high-pressure zone. In such wells, the leak was located across Arab-C in production liner. Then, the leak was squeezed off with cement. After that, the casing window was milled below the leak and a short radius curve section was drilled without penetrating the pay zone (Arab-D). Next, the expandable casing clad was utilized to enable drilling the low-pressure pay zone with low mud weight. Utilizing this technique enabled Saudi Aramco to drill short radius sidetracks while insuring integrity of the well, provide Geosteering in the pay zone and facilitate the option to run flow control/isolation systems. By drilling such wells as short radius re-entries, long radius sidetracks with open hole expandable liner option were avoided. Consequently, significant rig time and cost savings were achieved. After the success of this technique, short radius drilling was still carried out with wells that had casing leaks, and the leaks were stopped. Introduction Saudi Aramco has been drilling short radius re-entry horizontal sidetracks since 1994 to revive dead vertical wells in the giant Ghawar field and recover upswept oil at the top of Arab-D producing limestone reservoir. Arab-D reservoir is capped with anhydrite layer that separates it from the abnormally pressured Arab-C formation. The differential pressure between Arab-C and Arab-D varies across the field and can be as high as 2,000 psi. Recent short radius re-entries are performed only in the parts of the field where the anhydrite cap rock thickness is enough to allow a build up rate less than ± 60 deg/100'. This build up rate will allow rotating the drill string while drilling the horizontal section, geo-steering with full LWD suite, and will also allow running completion optimization equipment like ICDs (Inflow Control Devices) and fracture isolation systems to optimize production, increase recovery and prolong the life of the well. The practice is to complete the short radius wells as a bare foot if no fractures are encountered while drilling. Wells are completed with ICDs and/or fracture isolation systems when fractures are encountered 1." @default.
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• W2022758667 date "2009-05-09" @default.
• W2022758667 modified "2023-09-27" @default.
• W2022758667 title "Utilizing Expandable Casing Clad Enabled Short Radius Sidetrack in Wells with Casing Leaks" @default.
• W2022758667 doi "https://doi.org/10.2118/126050-ms" @default.
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