文中-文东油田低压高含水油井增产技术研究与应用

Research and Application of Increasing Production Technology for Low Pressure and High Water-cut oil Well in the WenZhong-WenDong Oilfield

随着油田注水开发时间的延长,地层能量不断下降,主力油层水淹严重,部分油水井间形成水窜导致低压高含水油井逐年增多,剩余油分布零散,油井原油采收率无法提高,为此对低压高含水油井产生原因进行调查分析,并在室内用岩芯进行实验研究,2010年开发了适合文中-文东油田的低压高含水油井增产技术,并进行了先导试验。2011年通过对该技术配方和施工工艺不断完善,现场实施了9口井,平均单井日增油1.7t/d,年累增油1528.9t。该增产技术的实施,不仅降低了油井无效产液量,而且减缓了油层压力递减速度,提高单井产油量,还促进油田综合经济效益提升。

Along with the extension of oilfield water-flooding development,the formation energy has dropped ceaselessly and the main oil layer has been water-flooded seriously.Moreover,the water breakthrough between partial oil and water wells result in the yearly increasing oil wells with low pressure and high water-cut,scattered residual oil and stagnation of crude oil recovery,therefore we investigated and analyzed the possible reasons causing the oil well with low pressure and high water cut,and then performed interior experimental study with core,eventually developed the increasing production technology of low pressure and high water-cut oil well for WenZhong-WenDong oilfield in 2010and conducted a pilot test.Through the continuous improvement of technical formula and construction technology in 2011,this technology has been implemented field application in 9wells,which averagely raises the daily oil production 1.7tand annual cumulative oil output 1528.9t.The conduction of this technology not only has reduced the invalid liquid production but also has slowed down the reservoir pressure decline rate,improved single well oil production and promoted comprehensive economic benefits in WenZhong-WenDong oilfield.