冻胶阀完井技术研究与应用

Study and application of smart pack completion technology

胡挺 曾权先 李华磊 席岩

HU Ting ZENG Quanxian LI Hualei XI Yan

西部钻探钻井工程技术研究院，新疆鄯善　838202

Research Institute of Drilling Engineering and Technology, Western Drilling Engineering Company, Shanshan 838202, China

全过程欠平衡钻完井技术钻井环节容易实现欠平衡作业，而完井环节实现欠平衡比较困难。针对目前欠平衡完井技术中利用套管阀完井费用较高、裸眼完井技术适用范围有限等难题，提出了冻胶阀完井技术。该技术利用一种凝胶体系将上部压井液与储层有效隔离，从而达到保护油气层的目的。通过室内实验，优选出冻胶阀配方，并对冻胶阀配方的耐压性、强度、密封性、稳定性、成胶时间、破胶时间、施工工艺、返排工艺展开研究。牛东89-912、鸭940等10井次成功现场试验表明，该技术不仅解决了目前欠平衡完井方式比较单一的被动局面，同时还实现了高效低成本的目标。

The drilling part of the full term underbalanced drilling and completion technology is easy to achieve underbalanced operations, but the completion part is difficult. To solve the difficulties of high cost when using casing valves and limited application scope when using open-hole completion, smart pack completion technique was proposed. It uses some gel system to separate the upper killing fluid from the formation, so as to protect the formation. By a large number of experiments, optimal choice of smart pack recipe was selected, and the smart pack recipe was studied in view of pressure tolerance performance, strength, sealing performance, stability, gelation time, gel breaking time, operation technique, and flow-back technique. Field tests on ten wells, including Well Niudong89-912 and Well Ya940, showed the technology not only solves the passive situation of relatively simple underbalanced completion method, but also achieved the objectives of high effeciency and low cost.