The Model and Application in Determining the Vertical Position of Horizontal Well in Gas Cap and Bottom Water Reservoirs
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摘要: 为了控制油井气窜和水锥，提高油藏开发效果，需要准确判断不同类型气顶底水油藏水平井合理的垂向位置。在分析不同类型气顶底水油藏生产特征的基础上，利用气体状态方程、物质平衡方程将气顶能量和底水能量与油环中水平井垂向位置建立联系，推导出水平井垂向位置关于气顶指数、水体倍数和油藏压力的数学模型。该模型能够利用气顶指数、水体倍数的相对大小来确定水平井合理的垂向位置，同时为了便于钻完井施工，给出了不同气顶底水油藏的最合理的水平井垂向位置。数值模拟试验及实例验证结果表明，根据气顶指数和水体倍数的相对大小来确定水平井在油环中垂向位置的方法对油藏具体几何形状没有限制和要求，具有较好的适用性。Abstract: To control gas channeling and water coning, and to enhance development effect in oil reservoir, it is necessary to determine vertical positions of horizontal well accurately in gas cap and bottom water reservoirs. Based on the analysis of production characteristics of reservoirs with different bottom water and gas caps, a mathematical model has been derived for determining the vertical positions of horizontal wells that related to gas cap index, water volumes and reservoir pressures by using gas state equation and material balance equation, so as to establish the relationship among gas cap energy, bottom water energy and vertical positions of horizontal well in oil rim. The mathematical model can determine the reasonable vertical position of horizontal well in different gas cap and the bottom water reservoir to facilitate drilling operations. Numerical simulation and field application results showed that the technique had no restriction and requirement to the geometry of reservoir in determining vertical positions of horizontal wells in the oil rim in accordance with the gas cap index and water volumes, which possess a good adaptability for field applications.
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Keywords:
- gas cap /
- bottom water oil reservoir /
- horizontal well /
- vertical location /
- oil rim
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