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首页> 外文会议>SPE Asia Pacific improved oil recovery conference (APIORC 01) >Sensitivity Analysis of Horizontal Well Productivity under Steady-State Conditions
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Sensitivity Analysis of Horizontal Well Productivity under Steady-State Conditions

机译：稳态条件下水平井产能敏感性分析

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Many horizontal wells are being drilled allrnover the world to increase their productivity inrncomparison to that of vertical wells. Horizontalrnwells increase reservoir contact area and thusrnincrease productivity. Therefore, it is essential to bernable to predict the horizontal well productivity. Thernmajor objectives of this investigation are to: (1)rndevelop a comprehensive evaluation of currentlyusedrnsteady-state productivity equations ofrnhorizontal well, (2) investigate the effect ofrnhorizontal well length and pay zone thickness on thernproductivity ratio of horizontal well to vertical well,rnwhen both having the same drainage area and underrnidentical flow conditions, and (3) study therninfluence of pressure drop on production rate ofrnhorizontal wells using different steady-state flowrnequations.rnIn this study, six different steady-staternequations of the open-hole horizontal wells underrnidentical conditions of flow parameters andrnreservoir geometry are subjected to a wide ranges ofrnhorizontal well lengths (100 to 3,000 ft), pay zonernthickness (50 ft to 500 ft), and pressure drop (10 psirnto 200 psi). These horizontal wells were used torncalculate the productivity and to study therninfluences of flow rate and pressure drop on thernsensitivity of these equations.rnThe obtained results showed that all steadystaternequations provide similar horizontal wellrnproductivity for horizontal well length < 1000 ft,rnwhile a remarkable difference appears and increasesrnwhen well length increases > 1,000 ft. In addition,rnthe results using all steady-state equationsrnconfirmed the recommendation of the application ofrnhorizontal well for thin formations and do notrnrecommend it in thick ones (h> 250 ft) for wellsrnhaving identical rock and fluid properties.rnComparing the performance of steady-staternequations showed that all of these equations arernsensitive to the increase of pressure drop, whichrnyields an increase in flow rate of horizontal well.rnThe results of this study have importantrnimplications in reservoir simulation studies, since itrnevaluates some important variables including payrnzone thickness, well length, and pressure drop onrnthe performance of each flow equation.
机译：世界各地都在钻许多水平井，以增加与垂直井相比的生产率。水平井增加了油藏接触面积，从而提高了生产率。因此，预测水平井产能至关重要。这项研究的主要目的是：（1）对水平井目前使用的稳态生产率方程进行综合评估，（2）研究水平井长度和产层厚度对水平井与垂直井生产率之比的影响。在相同的排水面积和不确定的流量条件下，（3）使用不同的稳态流量方程研究压力降对水平井产量的影响。在这项研究中，在相同的流量条件下，裸眼水平井的六个不同稳态方程参数和储层几何形状受水平井长度（100至3,000 ft），有效层厚度（50 ft至500 ft）和压降（10 psirn至200 psi）的影响。这些水平井被用来计算生产率，并研究流量和压降对这些方程的敏感性的影响。获得的结果表明，对于水平井长度<1000 ft，所有稳态统计方程都提供了相似的水平井生产率。井长增加> 1,000 ft。此外，使用所有稳态方程的结果都确认了对薄地层应用水平井的建议，对于具有相同岩石和流体性质的井，不建议在厚井（h> 250 ft）中使用。稳态方程的性能表明，所有这些方程对压降的增加都不敏感，这会导致水平井流量的增加。这项研究的结果对储层模拟研究具有重要的意义，因为它重新评估了一些重要的变量，包括开采量区域厚度，井长和压降影响每个流量方程的性能。

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