连续管试油作业研究与应用

Study and Application of Coiled Tubing Testing Service

针对常规油管试油作业存在施工周期长、劳动强度大等难题,结合连续管作业不动管柱、不压井、施工设备少、作业时间短、成本低等特点,研究并形成了一套较为完整的连续管试油工艺与配套,包括新井的井筒准备(试、探、洗、替、提),为后期作业提供清洁、安全的井筒环境;完井后固井质量检测,为射孔、压裂选层提供技术支持;直井精确定位射孔,沟通产层、水平井首段射孔,为压裂泵送提供通道;带压封闭已试油层,实现上返、下返试油或进行分层压裂改造;压裂完毕后进行复合桥塞钻除,还原井筒全通径,减小流动摩阻;并在生产过程中分层测试以获取各层段温度、压力、流量、含水等相关资料。经过现场试验应用,连续管试油工艺有效缩短了试油周期,提高了作业效率,降低了安全环保风险,促进了低渗透与非常规储层的勘探开发进程。

Conventional oil tubing testing service has a long period of operation and a high intensity of labor.Coiled tugging service has a number of advantages,such as without moving the production string,snubbing,less service equipment,short service time and cost-effective.The company has developed a complete set of coiled tubing testing processes and equipment,including wellbore preparations for new wells.These preparations provide a clean and safe environment for lateron service.Cementing quality inspection after well completion provides technological support for perforation and layered fracturing services.Accurate perforation of straight well,channeling of horizons and perforation of the first segment of horizontal well provide channels for transmission by fracturing pump.The tested reservoir sealed with pressure is brought under layered fracturing stimulation.In the wake of fracturing service,the compound bridge plug is removed to restore the full path of wellbore and reduce flowing friction.In the process of production,the layers are tested one by one to acquire the relative data of each horizon,such as temperature,pressure,flow and water cut.Field application indicated that coiled tubing testing process can effectively reduce oil testing period,improve service efficiency,lower the risks for safety and the environment and accelerate the exploration and development process of low-permeability and non-conventional reservoirs.