暂堵转向结合高排量体积重复压裂技术

Volume re-fracturing technology of temporary plugging and diverting with high displacement

蔡卓林 赵续荣 南荣丽 陈华生 李秀辉 梁天博

中国石油新疆油田分公司工程技术研究院，新疆 克拉玛依 834000 中国石油大学（北京）油气资源与探测国家重点实验室，北京 102249

Engineering Research Institute of Xinjiang Oilfield Company, PetroChina, Karamay 834000, China State Key Laboratory of Oil and Gas Resources and Exploration, China University of Petroleum, Beijing 102249, China

新疆油田503井区下乌尔禾组油藏老区重复压裂技术主要面临2个挑战：一是地层压力下降明显，平均压力系数由原始的1.30降至0.83，地层能量累计亏空110.37×10⁴ m³；二是油水关系复杂，水驱后平面上形成水线，侧翼驱替程度有限。针对老区油田开发中存在的问题，开展了暂堵转向结合高排量体积重复压裂技术的研究与应用。利用暂堵转向技术，使用高强度水溶性暂堵剂，达到了有效层内、层间多次转向的效果，形成了复杂体积缝网；采用高排量、低黏度滑溜水体系沟通人工裂缝周边的天然裂缝，提升了人工裂缝控制面积。暂堵转向结合高排量体积重复压裂技术为老井难动用储层的开发提供了新的模式。

The re-fracturing of the old Lower Wuerhe Formation reservoir in the 503 well area of Xinjiang Oilfield mainly faces two challenges: firstly, the formation pressure decreases obviously, the average pressure coefficient decreases from 1.30 to 0.83, and the cumulative deficit is 110.37×104 m3; secondly, the relationship between oil and water is complicated. Water lines are formed on the plane after water flooding, and the degree of flank displacement is limited. Given the problems existing in the development of old oilfields, the research and application of volume re-fracturing technology of temporary plugging and diverting with high displacement were carried out. Temporary plugging and diverting technology and high-intensity water-soluble temporary plugging agent is used to achieve effective multiple-diverting in intra-layers and inter-layers, thus to form complex volumetric fracture networks; a high-displacement and low-viscosity slippery water system is adopted to communicate natural fractures around artificial fractures, so as to improve the controlled area of artificial fractures. Volume re-fracturing technology of temporary plugging and diverting with high displacement provides a new model for the development of hard-to-produce reservoirs in old wells.

10.6056/dkyqt202005023