关键词: 单筒双井, 预斜扩眼, 钻井技术, 经济效益, 渤海油田

Abstract: In twin hole drilling, traditional technology only allows achieving an initial depth in twin hole due to limitations imposed by tools, processes and technologies. At the same time, there are some drawbacks, such as having two wells in one hole, making another hole when reaming and poor cementing quality. All these conditions make it impossible to meet demands of some wells. To solve these problems, based on the analysis of the advantages and disadvantages of the existing technology, combing the technological difficulties and technical limitations, the key points such as surface pretilt, reaming, casing down, cementing and cementing, and two hole separation are optimized. Finally, a set of practical, safe and efficient single barrel and double well preoblique reaming technology is obtained.

Key words: Twin hole in monobore, Preventive oblique and reaming, Drilling technology, Economic benefits, Bohai oilfield