CNPC completes deepest onshore well in China

On 21 January, the Keshen-902 well was completed at a depth of 8038 m, 15 m deeper than Keshen-7 (8023 m) drilled in 2011 at the same structural belt. The drilling cycle of Keshen-902 was 368 days, 380 days shorter than that of Keshen-7, with the drilling rate up by 50.8%.

Drilling success

Keshen-902 is an appraisal well allocated at the southwest wing of Keshen-9 structural high in the Kelasu structural belt, which is 4.3 km from Keshen-7. It was drilled by the 90002 Drilling Crew of CNPC Chuanqing Drilling Engineering Company Limited by using the domestically developed 9000 m electrical drilling rig. During the drilling operation, ROP enhancing difficulties caused by high gravel content in post-salt formations and falling cuttings were addressed, and imported PDC and turbine plus impregnated bits were used at the target beds.

Keshen-902 has registered three records: by far the deepest onshore well in China, the largest completion depth in a 333.4 mm borehole, and the largest setting depth with 273 mm casings.

 

Adapted from press release by Cecilia Rehn

Published on 28/01/2015


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