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首页> 外文会议>Technology advances >Performance of Horizontal Wells in Gas-Condensate Reservoirs, Djebel Bissa Field,Algeria
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Performance of Horizontal Wells in Gas-Condensate Reservoirs, Djebel Bissa Field,Algeria

机译：阿尔及利亚Djebel Bissa油田凝析气藏水平井的性能

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Properties of gas-condensate reservoirs are particularlyrndifficult to study due to the composition and phase changes ofrnlight components that occur during the reservoir depletion. Atrnthe first stage of their discovery, these reservoirs behave likerngas reservoirs during depletion. Once the dew point pressure isrnreached at reservoir conditions of pressure and temperature arnretrograde condensation phase develops in the reservoir.rnLiquid condensation in the formation can result in severe lossrnof well deliverability and therefore of gas and condensaternrecovery, which will certainly lead to a loss of income.rnIn this study, the performance of horizontal wells andrnvertical wells in gas condensate reservoirs is investigatedrnunder various depletion schemes. The expected low drawdownrnpressure for horizontal well, compared to vertical well for thernsame flow rate, considerably reduces retrograde condensation.rnA reservoir simulator is used to compare liquid saturationrnprofiles for horizontal and vertical wells in gas condensaternreservoirs. The influence of the horizontal well length sectionrnand reservoir thickness on horizontal well productivity, andrncondensate recovery were also studied. Another factorrninvestigated in this study is the effect of drilling a horizontalrnwell in a gas condensate reservoir that has already beenrndeveloped by vertical wells.rnTo illustrate the productivity increase due to the use ofrnhorizontal wells in gas condensate reservoirs, Djebel Bissarnfield (Figs. 1 and 2) data are presented and discussed using arncompositional single well model (VIP simulator). The mainrnresults of this investigation are as follows: A smaller pressurerndrawdown for a horizontal well compared to that of a verticalrnwell, eliminates or reduces liquid condensation in thernreservoir.rnLayers with higher capacity (kh) values contain the mostrnliquid accumulations.
机译：由于储层枯竭过程中发生的轻组分的组成和相变，使得凝析气藏的性质特别难以研究。在发现的第一阶段，这些油藏在枯竭过程中的行为类似于天然气藏。一旦在储集层压力和温度条件下达到露点压力，储集层就会发生逆向凝结相。地层中的液体凝结会导致井的可采性严重损失，从而导致天然气和凝析油的回收，这肯定会导致收入损失。在这项研究中，在各种耗竭方案下研究了凝析气藏中水平井和垂直井的性能。与相同流量的垂直井相比，水平井的预期低压降压力大大降低了逆凝结。储层模拟器用于比较天然气凝析油藏水平井和垂直井的液体饱和度曲线。研究了水平井长度段和储层厚度对水平井产能和凝析油回收率的影响。这项研究中研究的另一个因素是在已经由垂直井开发的凝析气藏中水平井的钻进效果。为了说明由于在凝析气藏中使用水平井，Djebel Bissarnfield带来了生产率的提高（图1和图2）。使用arncompositional单井模型（VIP模拟器）展示和讨论了数据。该研究的主要结果如下：与垂直井相比，水平井的压降较小，从而消除或减少了储层中的液体凝结。容量（kh）值较高的层所含的液体最多。

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