对称多分支井压力动态及流率分布

PRESSURE PERFORMANCE AND FLOW DISTRIBUTION OF SYMMETRIC MULTILATERAL WELL

多分支井技术是水平井技术的一种延伸，具有广阔的应用前景。在实空间均匀流率解析模型的基础上，利用划分节点的方法，对对称三分支井、对称四分支井、对称六分支井的压力动态及流率分布进行了计算，研究了分支数、无因次总井筒长度以及分支干扰的影响。结果表明，在总井筒长度、总产量与单支水平井相同的情况下，对称多分支井的压力动态出现了与水平井不同的特征。多分支井的流率分布强烈受到分支干扰的影响，分支数越多，井间干扰越严重，流率分布越不均匀，出现了不对称“U”型分布直至单调分布的特征。

Multilateral well technology is an extension of horizontal well technology and has broad application pros- pect. On the basis of analytical solution of uniform-flux in real space, node division method was used to calculate the pressure performance and flow distribution of symmetric multilateral wells, including three-branch, four-branch and six-branch. The influences of branch numbers, non-dimensional total well-bore length and branch interfer- ences were researched. The results indicated that under the condition that the total well-bore length and total pro- duction are identical with that of single horizontal well, the pressure performance of multilateral well has different characteristics. The flow distribution of multilateral well was strongly influenced by branch interferences. The more the branches, the stronger the branch interferences would be, and the more uneven the flow distribution would be, which presents asymmetric U-type distribution and monotonic distribution.