低渗透油藏水平井产能特征分析  

Analysis of characteristics of production capacity of horizontal wells in low permeability reservoirs

作　　者：陈晨[1] 唐林[1] 卢婧[1] 苗彦平[1] 

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

出　　处：《低渗透油气田》2014年第1期71-73,共3页

摘　　要：由于低渗透油藏低孔、低渗特点，以及存在启动压力梯度和应力敏感的双重影响，导致常规直井难以有效开发，水平井高效开发低渗透油藏成为趋势。通过保角变化推导低渗透油藏水平并稳态产能公式，分析水平并长度、储层有效厚度、启动压力梯度以及应力敏感对水平井产能的影响，得出结论：①提高水平井长度能有效提高产能，但存在最优长度；②水平井更适合低渗透薄层5～10m；③启动压力梯度对水平气井产量影响呈一线性下降关系，而压力敏感对水平气并产量影响为一幂函数下降关系；（多压力敏感效应比启动压力梯度对低渗透油藏水平井产量影响更为强烈。The low porosity and permeability characteristics of low permeability reservoirs and double impact of starting pressure gradient and stress-sensitivity lead to difficulties of effective development of conventional vertical wells. Application of horizontal wells becomes a trend to efficiently develop low permeability reservoirs. This article derives steady productivity formula of horizontal wells in low permeability reservoir by the conformal change, and analyzes the impact of horizontal well length, effective reservoir thickness, starting pressure gradient and stress-sensitivity on horizontal well deliverability. It is concluded that： ① increasing the horizontal well length can effectively improve the production capacity, but there is an optimal length; ② horizontal well is more suitable for 5 - 10m thin reservoirs with low-permeability; ③mpact of starting pressure gradient on the production of horizontal well showed a linear decrease correlation, while that of pressure-sensitivity showed a a power function decline relationship. ④ the influence of pressure-sensitive efl＇ects on the horizontal well＇s yield of low permeability reservoirs is more than that of the starting pressure gradient.

关 键 词：低渗透油藏 水平井 产能 启动压力梯度 应力敏感 

分 类 号：TE355.6[石油与天然气工程—油气田开发工程]