摘要
宋家垛油田周43断块K2t1为一天然能量充足的疏松砂岩底水油藏,因底水锥进和储层出砂双重影响,高含水开发期剩余油分布相对复杂。该断块自1996年投入开发以来,经历过2次加密调整,但由于储层出砂、底水锥进等因素影响,油井无水采油期短、见水后含水上升快。截至2010年4月,区块采油速度下降到0.58%,含水上升到90.9%,阶段采出程度仅为13.49%。针对周43断块高含水期采油速度低、出砂严重、含水上升率快等问题,通过剩余油定量化描述研究,应用短水平段水平井整体开发调整、化学堵水,以及优化避水厚度和临界产量参数等防砂控水技术,采取防治结合的思路,日产油水平从调整前的40.7t/d最高上升到132t/d,综合含水由90.7%下降到80.3%,目前日产油水平为117t/d,综合含水为83.8%,采收率从调整前的24%提高到29.7%,采收率提高5.7%。
K2t1 oil reservoir of Zhou 43 fault block in Songjiaduo oilfield is a loose standstone bottom water one with strong natural energy.Due to the double influence of bottom water coning and sand production,the distribution of residual oil is relatively complicated in the high water cut period.Since the fault block put into production in 1996,there has been two infill adjustment,but water free oil production period is short and wa- ter cut rises quickly after water breakthrough in the oil wells for influencing by the sand production and bot- tom water coning.By the end of April of 2010,oil production rate dropped to 0.58% and water cut rose to 90.9% and degree of interval reserve recovery is only 13.49%.In order to solve the problems of the low oil production rate ,more sand production and high speed of water cut rise in the high water cut period,a lot of sand control and water control technologies ,such as integral production adjustment for the horizontal wells with short horizontal section ,chemical water plugging,optimization of water avoidance thickness and critical produc- tion are applied to the development and adjustment of the reservoir based on quantitative description of the residual oil.After that,the daily oil production increased to 132t/d from 40.7t/d before the adjustment,and to- tal water cut dropped to 80.3% from 90.7%.Now daily oil production is 117t/d and total water cut is 83.8%. The oil recovery of the oil reservoir increased 5.7 percent from 24% before to 29.7%.
出处
《中外能源》
CAS
2013年第11期51-54,共4页
Sino-Global Energy
关键词
周43断块
疏松砂岩
底水油藏
剩余油
水平井
防砂控水
采收率
Zhou 43 fault block
loose sandstone
bottom water reservoir
residual oil
horizontal well
sand con- trol and water control
recovery efficiency
