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| 裂缝性气藏分支水平井试井模型及井底压力动态 |
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郭晶晶1,王海涛1,张烈辉1,刘启国1,冯焱昀2,李成全3
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(1.西南石油大学油气藏地质及开发工程国家重点实验室,四川成都 610500;2.中石化西北油田分公司,新疆乌鲁木齐 830011;3.西南油气田分公司低效油气开发事业部,四川成都 610017)
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| 摘要: |
| 综合运用渗流力学、数学物理方法、计算数学基础理论,基于严格的数学推导,建立裂缝性气藏分支水平井不稳定试井模型,并求得模型的Laplace空间解,利用Stehfest数值反演结合计算机编程,绘制出裂缝性气藏鱼骨型分支水平井的典型曲线。结果表明:裂缝性气藏鱼骨型分支水平井不稳定渗流过程可能出现早期纯井储段、井储后过渡段、裂缝系统第一径向流段、裂缝系统线性流阶段、裂缝系统第二拟径向流段、分支干扰过渡段、裂缝系统第三拟径向流阶段、窜流段和总系统拟径向流段9个流动阶段;水平井分支长度越短或分支间距越长,第二拟径向流段越明显。 |
| 关键词: 裂缝性气藏 分支水平井 试井模型 压力动态 典型曲线 |
| DOI：10.3969/j.issn.1673-5005.2014.06.016 |
| 分类号::TE 353 |
| 基金项目:国家自然科学基金项目 (51304165);国家杰出青年科学基金项目(51125019);中央财政支持地方高校发展专项(YC311) |
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| Well testing model and pressure dynamics for multilateral horizontal wells in naturally fractured gas reservoirs |
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GUO Jingjing1, WANG Haitao1, ZHANG Liehui1, LIU Qiguo1, FENG Yanyun2, LI Chengquan3
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(1.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China;2.Northwest Company of SINOPEC, Urumqi 830011, China;3.PetroChina Southwest Oil and Gas Field Company, Low-Efficiency Oil and Gas Development Affairs, Chengdu 610017, China)
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| Abstract: |
| A well testing model for multilateral horizontal wells in naturally fractured gas reservoirs was established based on the theory of fluid flow in porous media, and its analytical solution in Laplace domains was obtained. The characteristic curves for flows in commonly applied fishbone-type wells were plotted using a Stehfest numerical inversion algorithm. Nine different flow regimes can be identified and classified from the characteristic curves, including an early pure wellbore flow, a transitional flow, the first radial flow of the natural fracture system, a linear flow of the natural fracture system, the second pseudo-radial flow of the natural fracture system, an interference flow between the multiple well branches, the third pseudo-radial flow of the natural fracture system, an inter-porosity flow and a compound pseudo-radial flow. A parametric analysis shows that the shorter the fishbone-type branches or the longer the interspacing, the longer the duration of the second pseudo-radial flow. |
| Key words: naturally fractured gas reservoirs multilateral horizontal wells well testing model pressure dynamics characteristic curves |
