不对称垂直裂缝井产量递减规律  

Production decline law of the well with vertical asymmetrical fracturing crack

作　　者：熊健[1] 曾山[2] 王绍平[2] 

机构地区：[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]中国石油长庆油田分公司第二采油厂,甘肃庆阳745100

出　　处：《西安石油大学学报（自然科学版）》2014年第2期74-77,83,共5页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：国家科技重大专项"深水扇储层气田产能和开发指标预测研究"(编号:2008ZX005056-02-02-03);西南石油大学研究生创新基金项目"非线性渗流下低渗气藏产能特征研究"(编号:GIFSS0701)

摘　　要：针对油气藏改造时形成的垂直裂缝的不对称性和裂缝导流能力的时变性特征,基于不稳定流理论,应用复位势理论、叠加原理和数值求解方法,推导出低渗油藏垂直裂缝井产量的动态预测模型。利用实例分析了各因素对油井产量动态递减规律的影响。研究结果表明:裂缝非对称率对油井产量变化影响较小,不共面夹角对油井产量变化影响较大;裂缝越长,其导流能力越大,则油井产量越高,产量递减速度越快,而随着裂缝长度和导流能力增加,产量增加幅度逐渐变小;裂缝导流能力衰减系数越大,则油井产量越小,产量递减速度越快,随着导流能力衰减系数增加,产量下降幅度逐渐增大。A dynamical production prediction model of the oil well with vertical asymmetrical fracturing crack in low-permeability reservoir is established based on the non-steady seepage theory,the potential function theory,superimposition principle and numerical analysis method,and the effects of the crack parameters on the production decline law are studied by a case. The result shows that: the asymmetric ratio of the crack has a little effect on the oil well yield,and the non-coplanar angle has great effect on the oil well yield; the oil well yield and the oil well production decline rate are positive related to the length and the flow capacity of the crack,while the increment of the oil well yield is negative related to the length and the flow capacity of the crack; the oil well yield is negative related to the attenuation coefficient of crack flow capacity,while the oil well production decline rate and the increment of the oil well yield are positive related to the attenuation coefficient of crack flow capacity.

关 键 词：压裂井 不对称垂直裂缝 裂缝导流能力 裂缝非对称率 不共面夹角 产量递减规律 

分 类 号：TE357.11[石油与天然气工程—油气田开发工程]