大庆外围特低渗透油田开发试验

Experiment for Development of the Peripheral Ultra-low Permeability Oilfield in Daqing

大庆外围油田已开发20多年,扶杨油层还有3.7×108t的难采储量未动用。为了经济有效开发这部分难采储量,在州201区块开展了特低渗透扶杨油层有效开发工业化矿场试验,采用大井距、小排距矩形井网大型压裂注水开发,通过人工压裂裂缝与井网优化配置,建立有效驱动体系,形成了一套适合特低渗透油层的开发配套技术,提高了单井产量和储量动用程度,为特低渗透扶杨油层的有效动用提供了新的开发手段。统计25口采油井资料,初期平均单井日产液4.4t/d,日产油3.9t/d,采油强度0.49t/(d·m),截至2007年6月,已累计产油14866t,累计注水97153m3。

The peripheral oilfields in Daqing have been developed for over 20 years.There are still 370 million ton reserves difficult to produce in Fuyang oil layer.In order to develop these reserves,we carry out a lot of field experiments for ultra-low permeability reservoirs in Fuyang oil layer at Block Zhou 201 and use long well spacing and short row spacing rectangular pattern for fracturing and waterflooding development.An effective drive system is built up from artificial slit and well pattern disposal.A set of matching technologies fitting for development of ultra-low permeability reservoirs are formed.Using these technologies,the single well productivity and degree of producing reserves can be increased.Based on the statistical data of 25 production wells,the average daily liquid production of individual well is 4.4t,the daily oil production is 3.9t,and the production strength is 0.49t/（d·m） at initial stage.Up to June 2007,the cumulative oil production reaches at 14866t and the cumulative injection rate reaches at 97153m^3.