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CNPC completes deepest onshore well

By  Monday, 26 January 2015 09:53
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China National Petroleum Corp. (CNPC) completed the onshore Keshen-902 appraisal well in China at a total depth of 8038m.

Image from CNPC.

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

Keshen-902 is located at the southwest wing of the Kelasu structural belt, 4.3km from Well Keshen-7.  

CNPC reported the well is 15m deeper than the Keshen-7 well, drilled in 2011 in the same structural belt. The drilling cycle for Keshen-902 was 368 days, 380 days shorter than that of Well Keshen-7, with the drilling rate up by 50.8%.

The well was drilled by the 90002 Drilling Crew of CNPC Chuanqing Drilling Engineering, using the domestically developed 9000m electrical drilling rig.

CNPC says that 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.

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