低压稠油出砂油田防砂完井方式的优选

THE OPTIMAL SELECTION OF SAND CONTROL METHODS FOR LOW PRESSURE HEAVY OIL FIELD WITH SAND PRODUCING PROBLEM

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油田地层纵向上层系多、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。结合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的钻井损害 ,同时还具有增产作用 ,使得压裂充填完井产能基本上能恢复到天然产能 ,效果非常明显。由此可见 。

Sui Zhong 36-1 oil field is a low-pressure heavy oil field with high porosity and high permeability and unconsolidated payzones. According to the sand control criteria of on-site observation, experience, and mechanics calculation et al, the sand production will be the main problem of oil exploitation, and the sand control will be thekeypoints of oil development and formation damage control, As the Sui Zhong 36-1 oil field have multiple payzones with interbedded shale and water, the well completion method of inside casing gravel packing was selected finally. Our theoretical research and the experience at home and abroad shown that frac-pack can remove not only the skin factor of perforating crushed-zone damage but also all or most all drilling damage, at the same time, have the role of stimulation. So, the productivity of frac-pack completion is almost near to that of original one without damage. Thus it can be seen that frac-pack completion is the better sand control completion method for low-pressure heavy oil field with sand producing problem.