‘Level-off’ cement plugging method to cure lost circulation verified with case studies
نویسندگان
چکیده
Abstract Controlling lost circulation during drilling operations in a reservoir prone to fluid losses is typically remedied by cement squeezing or plug setting as the last resort. The aim being minimize stop and regain full returns at surface, maintain wellbore integrity. Different placement methods of plugs have been discussed detail literature, except for ‘level-off’ method, which can be effective curing complete loss cases. Following modeling calculations this its design execution procedures are discussed, together with two successful field cases highly fractured carbonate reservoirs Middle East. Using drill pipe Retrievable-Test-Treat-Squeeze (RTTS) packer, set some spacing from zone, method entails that slurry allowed drop gravity order cure circulation. As column fluid, mud well exceeds formation pore pressure, i.e., overbalanced conditions, volume acid-soluble slowly freely penetrate formation, through fractures caverns. During penetration viscous into fracture fissure openings plugged. Presented detailed level-off technique, determination required displacement volumes, recommended RTTS packer depths. expected depth top estimated. parameters compared explanations given possible discrepancies. Success operation terms final after plugging Non-Productive Time mitigation. Detailed also presented. job already practiced industry, but it not published they different causing errors. To best authors’ knowledge, first description stepwise calculation technique literature.
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ژورنال
عنوان ژورنال: Journal of Petroleum Exploration and Production Technology
سال: 2021
ISSN: ['2190-0566', '2190-0558']
DOI: https://doi.org/10.1007/s13202-021-01177-3