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数值试井技术在南海油气田中的应用 被引量:11

Application of numerical well-testing technology in oil/gas fields in South China Sea
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摘要 针对南海油气田存在的邻井干扰试井问题、多相流试井问题及非均质油气藏试井问题,开发了新型的数值试井技术——Voronoi数值试井技术。首先以渗流力学理论和物质平衡理论为基础,建立油气水三相渗流数学模型;然后利用Voronoi网格技术将数学模型进行空间及时间离散化,将油气藏离散为多个网格单元;最后采用迭代求解,得到各网格单元压力分布及各种物性参数。该技术以精细的Voronoi网格刻画了油气藏的实际地质情况,实现了精细的试井解释;与常规技术相比较,能将局部精细网格和基本粗化网格结合在一起,做到井筒、断层等附近采用精细网格,而离井较远的地方采用稀疏的基本网格,这样既能真实刻画油气藏地质特征,又可以最大限度地减少网格数据,提高了试井运算速度和精度。在南海油气田的实际应用效果表明,该技术能很好地解决多相流等疑难试井问题,为南海复杂油气田的试井分析提供了依据和方向。 A new numerical well-testing technology- Voronoi was developed to solve the various well testing problems associated with adjacent well interference, multiphase flow, and heterogeneous oil/gas reservoirs in oil and gas fields in South China Sea. First, a three-phase (oil, gas and water) seepage mathematical model was established according to the theories of seepage mechanics and ma- terial balance. Second, time and spatial discretization was done on this model with the Voronoi network technology so that oil and gas reservoirs were dispersed into multiple grid cells. Finally, the iteration method was used for computing the pressure distribution on each grid cell and physical property parameters. As a result, actual geological conditions of oil and gas reservoirs were presented with delicate Voronoi grids in this technology, which turned out to be an elaborate testing interpretation. Compared with the conven tional technologies, Voronoi bound both local fine grids and basic coarse grids together by using numerical fine grids at peripheries of well shaft and faults while sparse basic grids at the areas relatively distant from the well. In this way, geological characteristics of oil/gas reservoirs were definitely described and grid data was minimized as well, resulting in an increased arithmetic speed and preci sion in well testing. Actual application in oil and gas fields in South China Sea indicates that this numerical well-testing technology is a good solution to testing difficulties (e. g. multiphase flow) and provides a reference for well-testing data analysis in complex oil and gas fields in South China Sea.
出处 《天然气工业》 EI CAS CSCD 北大核心 2013年第4期52-55,共4页 Natural Gas Industry
基金 中海石油(中国)有限公司综合科研课题(编号:YXKY-2010-ZJ-02)
关键词 南海 油气田 数值试井 多相流试井 干扰试井 非均质油气藏 试井 应用 South China Sea oil/gas field numerical testing multiphase flow testing interference testing heterogeneous oil/gasreservoir well testing application
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