低压稠油出砂油田防砂完井方式的优选

绥中36-1油田属于低压稠油油田,目的层位为东营组下段,储层岩石胶结疏松,孔渗性极大。根据现场观察法、经验法及力学计算法等防砂判据综合判断,油井出砂将成为贯穿开发生产过程的主要问题,防砂则为开发生产及油层保护的重点和核心。由于绥中36-1油田具有地层纵向层系多、含夹层(泥岩夹层、含水夹层)等特殊情况,经研究后决定采用下套管注水泥固井并在射孔套管内进行井下砾石充填完井方案。国内外的经验和我们的理论研究表明:压裂充填不仅能消除射孔压实表皮系数,而且能消除全部或大部分钻井损害,同时还具有增产作用;压裂充填完井产能基本上能恢复到天然产能,且比常规砾石充填提高约2～4倍,效果非常明显。由此可见,压裂充填完井是低压稠油出砂油田较好的防砂完井方式。

Optimization of Sand Control for Low Pressure Viscous Oil Field

SZ 36 - 1 oil field is categorized as a low pressure viscous oil field with its objective zone as the lower part of Dongying formation. The reservoir is un-consolidated and very permeable. According to field observation, experience and dvnamic calculation, sand production will be the key problem throughout the life of the field. sand oontrol and reservoir protection should be the focus issues in the development and production. Due to rnultiple kyers and inter-bedded feature(shale and water barriers), it is decided to use downhole gravel packing in the perforated casing and cementing after running casing. It is found that fracturing and gravel packing not only can eliminate the skin effects,but also can eliminate largelv the formation damage during drilling. It also has the function of stimulation to ensure the wells to come back to natural energy. The productivity would be 2 - 4 times higher than normai gravel packing. Thus it can be seen that gravel packing after fracturing is a good completion method for low pressure and viscous oil fields.