摘要
针对轮南油田JⅢ（6＋7）油组的实际油藏地质条件，利用相图判别法研究了该油藏的流体类型，并确定了油环的大小。在此基础上提出利用水平井开发此类油藏，并进行了优化设计研究。研究结果表明：JⅢ（6＋7）油组的油环原油地层流体样品为挥发油体系，并且油环的体积远大于凝析气顶。本油组适合水平井开发，水平段长度为350-400m较好，在相同压差下，其产量是直井产量的4．5倍，若考虑底水锥进的影响，则水平井的水平段应位于油水界面之上0．7～0．9倍油层厚度的位置较好；若不考虑底水锥进情况，则水平井的水平段位于油层中部位置产量最大。
According to the actual geological conditions of Sand Group JⅢ （6 ＋ 7） in Lunnan Oilfield, the fluid type and the scale of oil ring have been defined by phase diagram criterion in this paper. The optimization for design development has also been studied. The paper proposed that such reservoirs should be developed by horizontal wells. The study results show that the composition of condensate samples is of higher levels of heavy hydrocarbons and exhibits a larger loss of retrograde condensation, while the original oil sample taken from the oil ring of Sand Group JⅢ（6＋） is volatile oil and the volume of oil ring is much larger than the volume of condensate gas cap. The horizontal well is perfect for the development of the Sand Group, with the length of horizontal section ranging from 350 m to 400 m and production rate 4.5 times that of vertical well under the same pressure difference. The location of horizontal section should be at 0.7-0.9 times of the thickness of formation over the oil-water contact if the impact of bottom water coning is considered. If not, the location of horizontal section should be at middle of the formation where it has the largest production rate.
出处
《地质科技情报》
CAS
CSCD
北大核心
2011年第4期93-97,114,共6页
Geological Science and Technology Information
基金
国家重点基础研究发展计划项目"中国西部叠合盆地油气藏分布规律与有利区预测专项专题"(2006CB202308)
关键词
凝析气顶
挥发性油藏
流体类型
水平井
底水锥进
condensate gas cap
volatile oil reservoir
fluid type
horizontal well
bottom water coning
