迪那2气田测射联作完井工艺评价与优化

Evaluation and optimization on the well completion technology of combined testing and perforating in Dina 2 Gasfield

胡素明 王好 肖香姣 陈宝新 张永宾

HU Suming WANG Hao XIAO Xiangjiao CHEN Baoxin ZHANG Yongbin

中国石油塔里木油田分公司天然气事业部 中国石油塔里木油田分公司勘探开发研究院

Natural Gas Business Dividion, PetroChina Tarim Oilfield Company, Korla841000, Xinjiang, China Exploration and Development Research Institute, PetroChina Tarim Oilfield Company, Korla841000, Xinjiang, China

测射联作工艺具有减少起下管柱作业、降低储层污染、提高油气井完井效率等优点，因此在迪那2气田产能建设早期，普遍采用测射联作并且不丢枪的完井工艺，但投产后逐渐暴露出井筒堵塞、井下动态监测受限等问题，因此有必要对该工艺进行评价及优化。调研统计，产建早期测射联作完井的生产井75%出现油压急剧波动下降的异常现象；结合气藏工程理论及修井实践分析，油压异常的根本原因在于，堵漏剂返排、地层出砂等堵塞了测射联作管柱末端的生产筛管（即打孔油管）孔眼。对此，产能建设中后期采用射孔、测试分步实施的完井工艺，显著减少了井筒堵塞的现象，并为生产动态监测的开展创造了有利条件。迪那2气田的完井工艺实践对于类似气田具有较好的借鉴意义，在选用测射联作完井工艺之前，应进行充分的适用性评价或针对性的改造优化。

Combined testing and perforating technology is advantageous for it can diminish tripping operation, reduce reservoir damage and improve oil and gas well construction efficiency.The well completion technology of combined logging and perforating without releasing the gun was commonly used in the early stage of productivity construction in Dina 2 Gas Field.After its commissioning, however, some problems occurred gradually, such as wellbore plugging and restricted downhole performance monitoring, so it is necessary to evaluate and optimize this technology.Investigation and statistics show that the abnormal phenomenon of sharp tubing pressure drop appears in 75% of production wells which are completed by means of combined logging and perforating technology in the early stage of productivity construction.This abnormal tubing pressure was analyzed based on gas reservoir engineering theories and workover practices.And it is indicated that its essential cause is that the holes of production screens (i.e., holed tubing) at the end of combined testing and perforating string are blocked due to plugging agent flowback and formation sand production.To solve this problem, perforating and testing is carried out by stages in the middle and late period of productivity construction.Consequently, thephenomenon of wellbore plugging is reduced, and it is favorable for the implementation of production performance monitoring.The application of this optimized well completion technology in Dina 2 Gas Field can be used as the reference for similar gas fields.Before the well completion technology of combined testing and perforating, it is necessary to carry out sufficient adaptability evaluation and specific modification and optimization.

10.13639/j.odpt.2017.02.015