中国石油大学学报（自然科学版）2016，Vol.40Issue(5)：87-95,9.DOI:10.3969/j.issn.1673-5005.2016.05.010
连续油管带筛管双重管柱岩屑运移模型研究
Slotted liner sheathing coiled tubing-a dual-pipe model for cuttings transport
摘要
Abstract
Drilling with slotted liner sheathing coiled tubing ( SLSCT) is a new technique for multilateral jetting, which is designed to synchronize the jet drilling and liner tube running in one trip. Its drilling assembly includes dual-pipes, thus the cuttings transport efficiency in a dual-pipe mode needs special analysis. In this study, laboratory experiments were con-ducted to investigate the cuttings transport mechanisms in a dual-pipe system. A Monte Carlo algorithm was proposed to de-termine the amounts of cuttings entering the annulus between the coiled tubing and slotted liner, and it was also used to es-timate the critical pumping rate and drilling rate for the case of cutting blocking. A four-layer model for cuttings transport with the SLSCT multilateral jetting was established, including suspension layer, moving bed layer, stationary layer and cut-ting blocking layer, which exist in the annulus between the coiled tubing and slotted liner. The cuttings carrying capability of a dual-pipe system is higher than that of the conventional coiled tubing drilling due to the smaller flow area thus the high-er annular pumping velocity. Under the experiment conditions of this research, the critical condition for no cutting blocking is that, in the case the slot size smaller than the cutting particle size, the pumping rate is higher than 0. 98 L/s, or the ROP is smaller than 40. 09 km/h, and the wider the slot size, the lower the ROP. In the case of the slot size larger than the cutting particle size, the pumping rate is recommended to be higher than 0. 88 L/s, or the ROP is smaller than 5. 74 km/h.关键词
多分支井/连续油管/割缝筛管/岩屑运移/蒙特卡洛方法Key words
multilateral well/coiled tubing/slotted liner/cuttings transport/Monte Carlo method分类
能源科技引用本文复制引用
杨睿月,黄中伟,李根生,沈忠厚,韩树,许争鸣..连续油管带筛管双重管柱岩屑运移模型研究[J].中国石油大学学报（自然科学版）,2016,40(5):87-95,9.基金项目
国家科技重大专项(2011ZX05037-001) （2011ZX05037-001）
