摘要：In order to solve the problem that how far the offshore extended-reach well (ERW) can extend, the open hole extended-reach limit theory is used to establish the open hole extended-reach limit model for three offshore drilling modes including offshore conventional drilling and two dual gradient-drilling (DGD) modes, and the corresponding case study is analyzed. The results show that, water depth has great influence on the open hole extended-reach limit of ERW due to the particularity of offshore drilling; there is a decrease of the open hole extended-reach limit as the water depth is increased, and in general, the open hole extended-reach limit adopted two kinds of DGD modes are greater than that of offshore conventional drilling mode. Specifically, under the condition given by this article, the horizontal section limit of offshore conventional drilling is 4318 m, while both the two limits of DGD modes are close to 4500 m; as a contrast, the limit of onshore drilling is 7157 m. According to the sensitivity analysis of parameters in above models, the open hole extended-reach limit is decreased with the increase of mud density and mud flow rate, and the mud weight window of DGD mode is wider than that of offshore conventional drilling, which is one of the advantages of DGD; at the same time, there is an optimal eccentricity which can be used to improve the open hole extended-reach limit. (C) 2016 Elsevier B.V. All rights reserved.

关键字：Open hole extended-reach limit Offshore drilling Dual gradient-drilling Sensitivity analysis Fracture pressure

ISSN号：0920-4105

卷、期、页：卷: 146 页: 400-408

发表日期：2016-10-01

期刊分区（SCI为中科院分区）：三区

收录情况：SCI（科学引文索引印刷版）,ESI（基本科学指标数据库）,EI（工程索引）,SCIE（科学引文索引网络版）

发表期刊名称：JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING

参与作者：周英操

通讯作者：李鑫

第一作者：高德利,张辉

论文类型：期刊论文

论文概要：李鑫,高德利,周英操,张辉，A model for extended-reach limit analysis in offshore horizontal drilling based on formation fracture pressure，JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING，2016，卷: 146 页: 400-408

论文题目：A model for extended-reach limit analysis in offshore horizontal drilling based on formation fracture pressure