复杂致密油藏开发的关键技术

鄂尔多斯盆地延长统超低渗储层具有岩性致密、物性差、孔喉细小、启动压力梯度大、易伤害等特点。在储层差异性研究基础上，通过低伤害压裂体系液、前置酸、改性注入剂、井网形式等优化技术，可降低对储层的伤害，改善孔隙结构，提高渗流面积，达到增产效果。直井小排距、五点井网可初步建立有效压力驱替系统，提高单井产量。垂直于主应力方向水平井，采用水力喷射压裂技术可初步实现致密油藏的有效开发。

Key Technology of Development of Complex Tight Oil Reservoirs

Extra-low permeability Yanchang Formation reservoirs of Ordos Basin have characteristics of tight lithology, poor physical properties, small pore throat, high starting pressure gradient, easy to be damaged. Based on the reservoir difference study, we can reduce the harm to the reservoir to improve the pore structure, increase the percolation area, and achieve the production improvement through optimization technologies such as low damage fracturing fluid systems, spearhead acid, modified injection agent, and well patterns etc. Vertical wells in small row spacing, five-spot pattern can be used to set up effective pressure displacement system and enhance individual production rate. Horizontal wells perpendicular to direction of the principal stress, hydraulic jetting fracturing technology can be used to achieve preliminarily the efficient development of the tight reservoirs.