氮气泡沫冲砂技术在稠油热采亏空井层的研究应用  

Study on Nitrogen Foam Sand Washing Technology in Heavy Oil Thermal Recovery Wells in Voidage Reservoirs and Its Application

作　　者：蔡汉文[1] 

机构地区：[1]长江大学石油工程学院,湖北武汉430100

出　　处：《长江大学学报（自科版）（中旬）》2016年第3期70-74,6,共5页Journal of Yangtze University(Nature Science Edition)

摘　　要：河南油田部分稠油热采井层经多轮次吞吐后,亏空严重,压力保持水平降低,出砂十分严重。针对常规冲砂技术无法满足施工要求的问题,提出了氮气泡沫冲砂工艺技术。采用筛选法优选出TFP-2起泡剂和TXP0401消泡剂,评价得到2种药剂分别具有较好的悬浮性能、携砂性能和消泡性能。在给定的地层压力、出砂粒径条件下,施工时应控制携砂平衡流速≤施工时泡沫流速≤漏失平衡流速。对氮气泡沫冲砂过程进行模拟,根据井筒泡沫流动模拟计算结果进行数据拟合,得到了井口施工参数简化计算公式。2014~2015年,在河南油田采油二厂采用氮气泡沫冲砂33井次,能够有效地冲出热采亏空井井筒沉砂,具有保护地层、延长检泵周期、降低油井排水期的作用。The reservoir deficit in part of heavy oil thermal recovery wells in Henan Oilfield was serious,pressure level was reduced and sand production was very serious after many rounds of steam drive.In consideration of the problem that the conventional sand washing technology could not meet the field operation requirements,a nitrogen foam sand washing technology was proposed.TFP-2foaming agent and TXP0401 defoaming agent were selected by using screening method,evaluation indicated that both two kinds of reagents had better suspension,sand carrying and defoaming performances.Under the given condition of formation pressure and sand particle size,the balance flow rate of sand carrying should be controlled to no greater than that of foam flow during the operation,and the foam flow rate should be controlled to no greater than the leakage balance flow rate.The process of nitrogen foam sand washing was simulated,data fitting was performed according to the wellbore bubble flow simulation result,a formula of simplified wellhead operation parameter was achieved.From 2014~2015,nitrogen foam sand washing has been used for 33 times in the Second Oil Production Plant of Henan Oilfield,the settled sand is effectively washed out from the thermal recovery wellbore,this technology has the function of protecting the bottom,extending pump inspection cycle and reducing the period of water drainage in oil wells.

关 键 词：稠油热采 亏空井层 冲砂 氮气泡沫 

分 类 号：TE345[石油与天然气工程—油气田开发工程] TE358.1