底水油藏多分支水平井水脊规律

Laws of water cone of multilateral horizontal well in bottom water reservoir

 常元昊 2 乐平 姜汉桥 刘传斌 高亚军 王依诚

中国石油大学（北京）石油工程学院，北京 102249 西南石油大学石油与天然气工程学院，四川 成都 610500）

College of Petroleum Engineering, China University of Petroleum, Beijing 102249, China School of Oil and Natural Gas Engineering, Southwest Petroleum University, Chengdu 610500, China)

 多分支水平井技术在延缓底水和气顶的脊进速度、提高油气井产量等方面作用明显，但在底水油藏开发中水脊问题仍然不可避免。文中利用数值模拟方法，建立了底水油藏多分支水平井模型，并分析了底水突破位置与发展情况的变化规律。研究结果表明：分支水平井底水突破位置主要为主支跟端附近以及处于中间的汇点部位附近，具体位置主要取决于分支角度、分支位置以及避水高度。合理产量随着分支数目与分支长度的增加而增加，且两者的影响程度较大；而分支位置与分支角度对合理产量的影响程度较小，其中合理产量随分支角度的增大先增加后减少。

 Multilateral horizontal well have obvious effects on delaying the speed of water coning for bottom-water and gas-cap and raising the production, but water coning is still an inevitable problem during the exploitation. Using numerical simulation methods, the model of multilateral horizontal well with bottom-water reservoir is built, and the changings of the bottom-water breakthrough position and developing situation are analyzed. The results show that bottom-water breakthrough position for multilateral horizontal well is mainly near the heel of main branch or near the middle sinks, the exact position is decided by branch angle, branch position and the height of water avoidance. Branch number and branch length share a positive correlation with reasonable output, and these two factors have great influence; branch angle and branch position have less effects, and with increase of branch angle, the reasonable output increases first and then decreases.

10.6056/dkyqt201604020