复杂断块油藏精细分层化学防砂技术与应用

Research and Application of Fine Layered Chemical Sand Control in Complicated Fault-block Reservoir

李建达 钱 钦 曹功泽 李 鹏 王国强 韩 宏

LI Jianda QIAN Qin CAO Gongze LI Peng WANG Guoqiang HAN Hong

针对疏松砂岩断块油藏非均质性强、化学防砂剂注入不均匀的问题，制备了水溶性低黏活性剂固砂体系，考察了固砂体系的注入性能及固砂性能影响因素。开展了“层内低黏活性剂固砂+层间分层管柱防砂”精细分层防砂技术研究。室内试验表明，低黏活性剂固砂体系具有黏度低、伤害小、固结强度高的特点。改性环氧树脂含量为10%、乙二胺含量为1%时，低黏活性剂固砂体系的黏度仅为4.5 mPa·s，流动性较好。固砂体系适用油藏温度为 50～90 ℃，固砂体系与石英砂所形成的胶结岩心的渗透率＞1 μm2，抗压强度＞5 MPa，且具有良好的动态耐冲刷性能。同时，基于分层化学防砂工艺管柱，实现一趟管柱分层选择性注入固砂剂，克服了防砂药剂注入不均匀的难题。矿场试验表明，精细分层化学防砂技术应用效果良好，典型措施井累产2700 d后，产液量为52.4 m3/d，产油量为5.3 t/d，有效期大幅提升，对于复杂断块油藏防砂井延寿增效具有重要意义。

To solve the problem of the uneven injection of sand consolidating agents in strong heterogeneous reservoir，a water-soluble low-viscosity surfactant sand consolidation system was prepared，and the injection performance and the influencing factors of the sand consolidation performance of the system were investigated. A fine layered chemical sand control technology was carried out based on the intralayer low viscosity active agent sand consolidation and interlayer selective separate-layer sand control. Indoor tests showed that the low viscosity active sand consolidation system was characterized by the good injectability，low damage and high consolidation strength. The viscosity of the sand consolidation system with 10% modified epoxy resin and 1%ethylenediamine content was 4.5 mPa s，exhibiting good flowability. The sand consolidation system was suitable for the reservoir temperature of 50—90 ℃. The permeability of the cemented core formed by the sand consolidation system and quartz sand was higher than 1 μm2，and the compressive strength was higher than 5 MPa，and it had good dynamic erosion resistance. The selective seperate-layer chemical sand control string was complemented based on the injection parameter optimization，which could implement the selective injection of sand consolidation agents. The fine layered chemical sand control performed well in field tests. After a cumulative production of 2700 days，the liquid production of the test well was 52.4 m3/d，and the oil production was 5.3 t/d. The effective period had been significantly improved. It is of great significance to prolong the lifespan and increase the efficiency of sand control wells in complex fault-block reservoir.

10.19346/j.cnki.1000-4092.2025.01.016