多分支井电模拟试验研究

基于水电相似原理,引进高精度测量仪器,设计水平井和多分支井的电模拟试验,由带阻值的井模型证明了井筒内流体流动产生的摩擦压降导致油井产能下降。在此基础上,研究分支数目、分支角度、供给边界、完井段打开程度等参数对油井产能的影响,量化各个分支对多分支井产能的贡献度,描述多分支井等压线分布规律。结果表明,多分支井产能随着分支角度和分支数目的增加而增大,但增加趋势逐渐变缓;多分支井的分支与主井筒之间存在干扰,同侧分支之间也存在干扰;供给边界的大小及与油井的相对位置对油井产量影响较大;在完井段不完全打开时存在最优的完井段分布方式。试验结果为水平井和多分支井的产能计算和形态优化提供了依据。

Experimental Research of Electric Analogy for Multi-lateral Wells

Based on the water and electricity similarity principle,a series of electric analogy experiments were designed for the horizontal wells and multi-lateral wells by using high precision measuring instruments.The well models with resistance proved that the frictional pressure drop due to fluid flowing in the wellbore caused the productivity decrease.Then the effect of number and angle of branches,boundary conditions and perforated degree of completion segment on productivity was studied,and the contribution of each branch of the multi-lateral horizontal well to oil production was quantified and the equal pressure contour distribution rules of the multi-lateral well was described.The results show that the productivity increases with the increase of number and angle of branches,but the increasing trend slows down.There exists interference between branch holes and main holes and the lateral branches.The size of supply boundary and the relative position of oil wells have obviously effect upon the oil production.When the completion segment is not fully perforated,the optimal distribution mode of the completion segments can be obtained.The experimental result provides the basis for productivity calculation and morphology optimization of horizontal wells and multi-lateral wells.