底水油藏水平井临界产量确定新方法
New Method for Determination of Horizontal Well Critical Output in Bottom-water Reservoir
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- 引用格式:
-
袁淋,李晓平,延懿宸.底水油藏水平井临界产量确定新方法[J].天然气与石油,2015,33(1):0.doi:
Yuan Lin, Li Xiaoping, Yan Yichen.New Method for Determination of Horizontal Well Critical Output in Bottom-water Reservoir[J].Natural Gas and Oil,2015,33(1):0.doi:
- DOI:
- 作者:
- 袁 淋1 李晓平1 延懿宸 2
Yuan Lin, Li Xiaoping, Yan Yichen
- 作者单位:
- 1.西南石油大学“油气藏地质及开发工程国家重点实验室”，2.中国石油长庆油田分公司第十采油厂
1.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University; 2.PetroChina Changqing Oilfield Company Oil Production Plant 10
- 关键词:
- 底水油藏；水平井；临界产量；底水脊进；椭圆流
Bottom-water reservoir; Horizontal well; Critical output; Cresting of bottom water; Elliptical flow
- 摘要:
- 底水油藏水平井临界产量作为确定油井合理生产制度、延长无水采油期、提高水平井开发效果的重要参考依据，是控制油井过早见水的一个重要指标，准确计算其大小在底水油藏开发中至关重要。以底水油藏底水脊进机理为基础，借助底水油藏直井底水锥进渗流理论，考虑水平井筒周围椭球形等压面，利用椭圆流原理以及发展矩形族方法推导了底水油藏水平井临界产量计算新方法。通过实例计算与对比，新公式计算结果与修正Chaperon模型临界产量计算结果相对误差较小，说明新公式准确性较高，而Giger-Karcher模型、程林松-范子菲模型、窦宏恩模型由于假设条件与底水油藏实际渗流模式不符，最终导致临界产量计算结果偏差较大。敏感性分析表明临界产量随着油层厚度、井筒位置与油层厚度之比的增大而增大，而随着各向异性系数的增大而减小。
Horizontal well critical output in bottom-water reservoir is an important basis for determining reasonable production system of oil well, prolonging water-free oil production period and improve horizontal well development effect and also an important indicator for controlling too early water occurrence in oil well. Accurate calculation of horizontal well critical output is critical in bottom-water reservoir exploitation. Based on the bottom-water cresting mechanism of bottom-water reservoir, with the help of the theory of seepage flow of bottom water coning in bottom-water reservoir vertical well, considering the constant pressure surfaces of the ellipsoid around horizontal wellhole, the principle of elliptical flow and method of family of the rectangle are applied to deduce a new formula for calculating horizontal well critical output in bottom-water reservoir. Analysis results of actual calculation examples show that there are smaller errors between calculation results obtained from the new formula and those of correction Chaperon model critical output calculation, which indicates that the new formula has good accuracy. Due to unconformity of actual seepage flow pattern of the bottom-water reservoir between the assumed conditions of Giger-Karcher model, Cheng Linsong-Fan Zifei model and Dou Hongen model, critical output calculation results have large deviation from each other. Sensitivity analysis shows that critical output increases along with increase of reservoir thickness and the ratio of wellbore location and reservoir thickness, and decreases along with increase of anisotropy coefficient.
