Enhancement of ROP in Well Bei-209 of the Longfengshan Gas Field

Drilling operations in the Longfengshan Gas Field are susceptible to borehole collapse in the upper formations, circulation lost in the lower formations, low ROP and prolonged drilling times. To enhance the ROP and to minimize the time in drilling operations, research and experiments on high-speed drilling technologies were carried out for Well Bei-209. Based on the analysis on geological information and the formation characteristics of the Longfengshan Gas Field, well casing program, combined drilling of PDC bit+0.5° single bend PDM, hydro-efflux hammer for gravel layers, mechanical wireless MWD, SMROP-1 fast drilling additives and other key technical measures were adopted to achieve safe and fast drilling of Well Bei-209. Under these conditions, the resulting ROP was 8.62 m/h, 53.28% higher than the average ROP previously achieved in the gas filed. At the same time, the drilling cycle was 40.98 d, 22.40 d shorter than designed. Research results showed that the proposed high-speed drilling techniques for Well Bei-209 could provide references for follow-up operations to enhance the ROP and efficiencies in the Longfengshan Gas Field.