摘要
报道了本课题中5个方面的研究结果。①将注水在炮眼附近的流场看作大空间内细支管的向外射流,简化为二维问题,数值求解注水的控制方程,得到了主管流速一定、支管流量比不同时的若干射流流场,指出了流场特点,表明此调剖方法是可行的。②给出了调剖球在注水中所受8种力的表达式,由力值量级比较认为,在实际条件下重力、惯性力、广义浮升力、附加质量力和粘性阻力是主要作用力,而Basset力、Magnus力和Saffman力可忽略。③剖析了调剖球在注水管、井筒、油套环空流动和被炮眼吸附时的运动状态。④讨论并计算了调剖球在注水中的运动轨迹,给出了球直径、密度、炮眼流量比、球初始位置影响封堵的二维图示。⑤简述了在包含3个吸水层、总质量流量为5t/h的模拟实验装置上测得的各层堵球数、堵球概率和分流量与投球数的关系,给出了一个调剖球封堵底层炮眼的实测运动轨迹,验证了该条件下炮眼附近的流场。图20参9。
The results of comprehensive researches on the subject are presented in 5 aspects. ① The flow field (FF) of injected water near a perforation (P) is considered as efflux through a narrow side tube from a large room and simplified to a 2 D problem, the digital solution of injection water (IW) flow controlling equations leads to the efflux FF obtained for given flow velocity and different flow rate ratio of primary and side streams (FRR), the characteristics of the FF are described and show the feasibility of this method of modifying injectivity profile in water injection wells. ② The mathematical expressions of the forces applied on a rigid ball in IW are presented and the comparison of their magnitude shows that the main, effective, forces are gravity, inertia, generalized buoyancy, force owing to extra mass, and viscous drag with Basset, Magnus, and saffman forces being ignored. ③ The motion of the balls in the pipe, borehole, and annulus and near the P is analysized. ④ The path of a moving ball in IW is discussed and calculated and some 2 D pictures showing the effects of the diameter, density, and initial location of the ball and the FRR upon closing a P is given. ⑤ The number and the probability of effectively closing balls and the partial flow rates for 3 layers in relation to the total number of balls put are measured on a simulative experimental installation with total flow rate 5 t/h, the real moving path of a ball closing a P at the low layer is illustrated, serving an evidence of the FF near a P calculated.
出处
《油田化学》
CAS
CSCD
北大核心
2003年第2期113-118,共6页
Oilfield Chemistry
关键词
油田
注水井
投球调剖工艺
吸水剖面调整
单向封闭
硬质塑料球
water injectivity profile modification
perforation
unidirectional close
rigid plastic balls
flow field analysis
analysis of acting forces
moving path
injection water
