渤海油田泡沫吞吐解堵技术研究与应用

稠油油藏由于储层胶结疏松,原油胶质、沥青质含量高,加上稠油中重质组分与细粉砂、泥质成分混在一起,往往在防砂管柱筛孔处形成堵塞,造成近井地带堵塞,影响了油井产能。常规的有机解堵或酸化增产措施很难解除这种复合堵塞,即使解堵后,效果也不理想。针对上述问题,提出了泡沫流体吞吐解堵技术,进行了室内实验和数值模拟计算。优选的高效清洗剂Po-Ca,在5%浓度时降黏率达到99.28%、对油砂的清洗效率达到94.6%,并通过在渤海油田一口稠油井首次成功应用后该井由停产井变为产量为28-30 m^3/d的高产井,取得了满意的效果。该技术为海洋稠油油藏低产低效井综合治理提供了一种新的技术手段,对渤海油田低产低效井的增产具有重要的意义。

Research and application of a plug removal technology through foam soaking in Bohai offshore oilfield

Blockage usually happens near the wellbore in heavy oil reservoirs due to unconsolidated cementation,high gum asphaltic content,especially when the sand-controlling strings were blocked by heavy constituents and fine silts as well as argillaceous sediments,which would reduce oil well productivity dramatically.It is very difficult to deal with this composite blockage by conventional organics plugging removal or acidization stimulation methods.A novel plugging removal technology has been developed by experiments and numerical simulation.The experiments and numerical simulation results indicate that the viscosity reduction rate can reach 99.28% and oil sands-cleaning efficiency can reach 94.6% for the selected detergent Po-Ca at the concentration of 5%.The technology has been successfully used in a shutdown well of Bohai oilfield for the first time,and the average oil production increases to 28～30 m^3/d.As a novel technology for improve the oil production of low efficient wells,this technology has a great application prospect in offshore heavy oil reservoirs.