Complete technology for ROP improvement for Well PZ-115 in Pengzhou Gas Field

Abstract:

There are some difficulties in drilling in Pengzhou Gas Field in Longmen Piedmont. In the upper strata, gas drilling technology is limited and prone to deviation. The middle part of the Xujiahe Formation and the Xiaotangzi Formation is featured of strong abrasiveness and poor drillability. In the lower Leikoupo Formation, the strata are relatively broken, prone to bit sticking and easy to leak. ROP is low and the drilling duration is long. Based on the analysis of geological data and formation characteristics in Pengzhou Gas Field, the research and application of complete technologies for ROP improvement, such as optimizing the well bore structure, hydraulic WOB, vertical drilling technology, PDC bit optimization technology, high-efficiency drilling fluid technology and torsion impactor, were carried out in Well PZ115. Safe and fast drilling was achieved with the average drilling speed at 2.62m/h and the drilling duration 265.75d. Compared with the shortest drilling duration of Well YS1 in the same block, the drilling depth and the ROP increased by 454m and 24.17% respectively, creating the record of the deepest drilling depth and the shortest drilling duration in the fourth member of the Leikoupo gas reservoir in the West Sichuan area. Research results show that the proposed high-speed drilling techniques for Well PZ115 can provide references for coming operations to enhance the ROP and efficiencies in Pengzhou Gas Field.