收稿日期: 2013-03-28
修回日期: 2013-05-10
网络出版日期: 2014-02-10
基金资助
国家科技重大专项(编号:2011ZX05015)资助.
Rate Decline of Multiple Fractured Horizontal Well and InfluenceFactors on Productivity in Tight Gas Reservoirs
Received date: 2013-03-28
Revised date: 2013-05-10
Online published: 2014-02-10
为得到致密气藏压裂水平井的产量影响因素及递减规律，利用考虑气体滑脱效应的拟压力和拟时间变量，建立带有矩形封闭边界的分段压裂水平井渗流数学模型，应用Newman乘积、Laplace变换、相似流动替换及压力叠加原理求解模型以得到气井不稳态产量公式。通过公式研究裂缝长度、导流能力、裂缝数和水平压裂段长度等参数对气井产能的影响，并应用正交试验法做参数敏感度分析。研究表明:裂缝参数不影响封闭气藏的弹性采收率，但决定达到弹性采收率的有效开采年限；增加裂缝导流能力、裂缝长度均可有效减缓气井递减速率，减小开采年限；压裂段长度、裂缝数间存在最优组合，当各裂缝泄流面积相等时开采效果最佳。在实例分析中，裂缝数、压裂段长度、缝长、导流能力对气井产能的影响程度依次降低，最优参数组合为裂缝数3条、缝长为97.6m，压裂段长为279.2m，导流能力为2 446.8×103μm3。
王军磊，贾爱林，何东博，位云生，齐亚东 . 致密气藏分段压裂水平井产量递减规律及影响因素 致密气藏分段压裂水平井产量递减规律及影响因素[J]. 天然气地球科学, 2014 , 25(2) : 278 -285 . DOI: 10.11764/j.issn.1672-1926.2014.02.278
To investigate rate decline and influence factors on gas well productivity,a mathematical model was established based on new definitions of pseudo pressure and time incorporating the slippage effect.Rate solution for model was presented through applying Newman product principle,Laplace transform,substitution method and superposition method.The effect of fracture length,number,conductivity and length on rate decline was analyzed respectively,and the influence degree was measured based on orthogonal experimental design.The result shows that the value of elastic energy recovery is constant,but the maximal production time is the function of fracturing parameters.Better development effect means higher productivity and smaller maximal production time.It is realized by larger conductivity,fracture length,and equivalent drainage area controlled by fracture length and number.In orthogonal experimental design,fracture number owns the most obvious effect on maximal production time,and fracturing length takes second place,fracture length third,fracture conductivity forth.In practical application,the optimization of MFHW is that fracture number equals to 3,fracture length equals to 97.6m,fracturing length equals to 279.2m,fracture conductivity equals to 2446.8×103μm3.
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