China National Petroleum Corp. (CNPC) reported Monday that well Keshen-902 in China's Tarim Oilfield was completed Jan. 21 at a depth of 26,371 feet (8,038 meters), 49 feet (15 meters) deeper than Well Keshen-7 (26,322 feet or 8,023 meters) drilled in 2011 at the same structural belt. The drilling cycle of Well Keshen-902 was 368 days, 380 days shorter than that of Well Keshen-7, with the drilling rate up by 50.8 percent.
Well Keshen-902 is an appraisal well allocated at the southwest wing of Keshen-9 structural high in the Kelasu structural belt, which is 2.67 miles (4.3 kilometers) from Well Keshen-7. It was drilled by the 90002 Drilling Crew of CNPC Chuanqing Drilling Engineering Company Limited by using the domestically developed 29,528 feet (9,000 meters) electrical drilling rig.
During the drilling operation, ROP (Rate of Penetration) enhancing difficulties caused by high gravel content in post-salt formations and falling cuttings were addressed, and imported PDC (Polycrystalline Diamond Composite) and turbine plus impregnated bits were used at the target beds. Well Keshen-902 has registered three records: by far the deepest onshore well in China, the largest completion depth in a 13.1 inch (333.4 millimeter) borehole, and the largest setting depth with 10.74 inch (273 millimeter) casings.
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