气井水平段的最优经济价值长度确定方法

A method of determining the horizontal-well lateral length with optimal economic value

目前从经济价值角度对水平井水平段最优长度确定方法的研究相对较少,而以往多从单一的技术角度分析水平井段的最优长度。为此,从技术与经济相结合的角度出发,通过分析水平井开发生命周期内的天然气产量、成本费用、经济效益随水平井段长度的变化,建立了气井水平段最优经济价值长度的确定新方法。研究思路:1根据水平气井二项式产能方程,结合采气曲线法,确定气井在不同水平井段长度条件下的合理产量;2进而利用数值模拟方法,计算不同水平井段长度的气井在开发生命周期内的产量变化;3利用水平井气产量的研究结果,考虑资金的时间价值,分析水平井天然气开发的投入与产出随水平井段长度的变化;4以财务净现值作为水平井天然气开发经济效益评价指标,通过财务净现值与水平井段长度的关系曲线,确定气井水平段最优经济价值长度。最后,采用实例计算证实了气井水平段最优经济价值长度的存在,并讨论了地层系数、天然气价格、经营成本等因素对水平段最优经济价值长度的影响。

From a combined perspective of technology and economy,we presented a new method of determining the horizontal-well lateral length with optimal economic value through analyzing the change of gas production,operating cost and economic benefits of such a well with the prolonging of its horizontal lateral length in the development life cycle.First,according to the binomial deliverability equation of a horizontal gas well,combining with the gas production curve methodology,we determined the reasonable production of such a well under different lateral length conditions.On the basis of production proration,we applied the numerical simulation method to determine the change of horizontal well gas production under the different lateral length conditions through the development life cycle.Then,using the research results of horizontal well production,considering the time value of capital,we analyzed the change of development input and output of a horizontal gas well with the prolonging of its lateral length.Meanwhile,we can determine the optimal economic value lateral length of a horizontal gas well by using the financial net present value as an evaluation index of economic benefits.Finally,we verified the existence of the horizontal-well lateral length with optimal economic value through the example calculation by this new method,and additionally,discussed the involved impact factors like formation conductivity,natural gas prices,and operation cost,etc.