HYDRAULIC OPTIMIZATION OF 8 ½” OH ONE PHASE WELL DRILLING IN LA-428 WELL

Abstract

One Phase Well (OPW) is one of the drilling innovations in the marginal field to increase the ratio of profit over well cost by eliminating 9 5/8” surface casing to reduce the well cost. The use of 9 ½” open hole in OPW has the effect of high fluid costs due to the higher volume compared to the previous well architecture. Hence, a smaller open hole is considered to reduce fluid volume which results in reduced fluid cost. This research is about to determine whether the OPW drilling with 8 ½” open hole is feasible or not by considering the hydraulic technical and economic aspect. The technical analysis is carried out to determine the hydraulic optimization using WellPlan Halliburton Landmark. The hydraulic optimization is carried out by choosing the optimum flow rate and total flow are of bit. The economic analysis is carried out by comparing the drilling fluid and cement cost as the controllable parameter with the 9 ½” open hole. Based on the simulation, the optimum flow rate and the optimum TFA give the result of good hole cleaning and all drilling operations fulfill the limitation. For economics, the drilling of 8 ½” open hole OPW able to reduce drilling fluid and cement cost.