中文摘要：

连续油管无限级压裂是近几年出现的水力压裂新技术,其本质是在连续油管上携带井下工具组合,打开连续油管滑套进行压裂或者射孔压裂。连续油管可以连续上提、下放,有效解决了传统压裂方法中压裂级数受限、作业时间长的弊端,同时能够准确压裂地层、准确进行支撑剂充填,压裂所需泵排量以及化学药品的量较小。埃克森-美孚公司研发的连续管无限级压裂技术是利用远程逻辑控制阀以及水力阀门组成的逻辑控制系统,根据井底压力变化控制连续油管连接的井下工具的开合,对不同压裂层位进行射孔压裂作业;NCS公司研发的连续油管无限级压裂系统是将压裂滑套同套管一起固井,通过连续油管连接的井下工具组合中的滑套定位器嵌入压裂滑套打开压裂孔,对不同压裂层位进行水力压裂。但由于连续油管稳定性差、使用寿命较短、抗内压和外挤能力较差、成本高,制约了连续油管无限级压裂技术在国内的推广应用,如何克服这些问题将是未来研究的主要方向。

英文摘要：

Coiled-tubing multistage unlimited fracturing is a new technology of hydraulic fracturing in recent years,whose essence is to carry downhole tools assembly on the coiled tubing to open the sliding sleeve of the coiled tubing for fracturing or perforating and fracturing. Since the coiled tubing can be lifted or lowered continuously,the disadvantages of fracture stages being limited and long-time operation in traditional fracturing were avoided.It can exactly predict fracture location and sand placement at the same time.Moreover,when fracturing,it needs less theoretic displacement and fewer chemicals.The principle of the coiled-tubing multi-stage unlimited fracturing technology developed by Exxon-Mobil Corporation is logic control system consists of remote intervention logic valve and hydraulic valve,open and close of the downhole tool assembly connected by the coiled tubing were controlled according to the change of bottomhole pressure,and different fractured layers were perforated.The principle of coiled-tubing multistage unlimited fracturing system developed by NCS Company is to cement with fracturing slide sleeve and casing,and fracture hole my be opened when sleeve locator among the downhole tool assembly connected by the coiled tubing was embedded in fracturing slide sleeve and the hydraulic fracturing may be done in different fractured layers.But poor stability,short service life,less capacity of resisting internal pressure and external collapse and high cost and other defects of the coiled tubing restrict the domestic popularization and application of the coiled-tubing multistage unlimited fracturing technology.How to overcome these problems will become the main direction in the future research.