Choice of Well Structure Design Parameters under Deepwater Drilling Condition

Environmental issues,narrow drilling window and large hole size,which lead to more casing points and less casing size,present difficult challenges in well structure design,so it is imperative to develop a better well structure design method in engineer practice. Since well structure design parameters used in offshore drilling manual are empirical values of onshore drilling and take scarce consideration of deepwater drilling characters,it is of great importance to choose competent design parameters which can be used in deepwater drilling to avoid down-hole accidents and problems. Based on the full consideration of deepwater drilling characters,parameter selection measures and recommendations are given. Compare to common well structure design method,deepwater well structure design must take account of the influence of riser margin,equivalent circulating density,kick margin. This research achievement has also provided references to the design and application of the onshore and shallow water well well structure design in the future.