针对注蒸汽热采稠油油藏非均质性严重、中低渗层动用状况差、高渗层汽窜干扰严重等问题,通过室内实验,向油田采出砂中加入固化剂(无机盐类)、分散剂(膨润土)、促凝剂(片碱),自主研制出新型KWF复合堵剂。其具有固化时间可调(3～300 h)、抗压大于6 MPa、耐温大于350 ℃的特点。该体系在注入高渗汽窜通道后与地层岩石胶结,封堵率大于85%,且不损害中低渗透层。现场应用表明,该体系可有效封堵大孔道,提高产油量,阶段累计增油可达1 057 t。采出砂调剖技术既解决了采出砂的环境污染问题,又降低了稠油热采开发成本,对提高油田最终采收率和经济效益具有重要意义。
In view of the severe heterogeneity of thermal stimulation with steam injection in heavy oil reservoirs, the poor development conditions of low-and medium-permeability layers, and the serious interference of steam channeling in high-permeability layers, a new KWF compound plugging agent was developed independently by indoor experiments where curing agent (inorganic salt), dispersant (bentonite) and coagulant (caustic soda) were added to the produced sand of the oilfield through. The new plugging agent was featured by adjustable curing time (3 to 300 h), and resistance to pressure of greater than 6 MPa and temperature of greater than 350 ℃. After the plugging agent was injected into the high-permeability steam channeling, the system was cemented with the formation rock and the sealing rate was more than 85%, without any damage to the low-and medium-permeability layers. The field application showed that the system effectively blocked the big pores and enhanced the oil production, and the cumulative oil production was increased by 1 057 t. The produced sand profile control technology not only solves the environmental pollution caused by produced sand, but also reduces the cost of thermal recovery of heavy oil, with great significance for improving the final recovery efficiency and commercial benefits of the oilfield.
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