Customer X used 1613BIM-1 mixed with imported cutters to make an 8.3inch drill with 6 blades, 3 pieces of BIM-1 were distributed on the No. 2 and No. 4 blades, and the others were mixed with imported cutters. The Pinghu Formation in the deep strata of the CNOOC East China Sea block near Shanghai is silt-bearing limestone. This formation has been drilled with imported XM53 before.

The specific drilling parameters are:

Well depth: 5632m (TVD4241)

Current well depth: 5967m (TVD4557)

Footage: 335m

Pure drilling time: 31.32h

Pump on time: 48.62h

Average speed: 10.69m/h

The drill bit is almost wear-free, rated 1-1-WT-A-X-I-NO-LOG;

The customer believes that the cutters wear very little.