裂缝性气藏不同完井方式渗流场分析  

Seepage Field Analysis of Fractured Gas Reservoir with Different Completion Methods

作　　者：吴欣袁[1] 练章华[1] 孟英峰[1] 魏臣兴[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,四川成都610500

出　　处：《天然气地球科学》2011年第6期1123-1127,共5页Natural Gas Geoscience

基　　金：国家自然科学基金项目"基于数值模拟的复杂地层地应力反演研究"(编号:50774063)资助

摘　　要：地层模型中具有多条不规则天然裂缝,有的裂缝直达井壁,有的裂缝相互贯通,造成渗流规律复杂,运用常规的解析算法很难对其进行计算求解。采用有限元方法,基于ANSYS软件进行建模,模型中对地层和裂缝采用同一种材料,通过引入裂缝放大系数来区分并描述裂缝对流体导流能力的增大。模型中考虑了钻井液入侵造成的井壁和裂缝污染带,通过引入污染系数来描述污染带的渗透率下降。通过模拟计算得出2种模型的渗流压力场分布、渗流速度场分布以及全井流量,并进行对比分析,为完井方式的选择提供较为直观的理论依据。In this paper,we set up the two finite element models for the perforated completion of fracture sequence and the screen completion.In the sequence model,there are many natural fractures,some fractures directly touch well wall,others are connected each other,causing the complex seepage.It is difficult to calculate by the conventional method.Thus,we have to use finite element method.Based on ANSYS software,we use the same material for the sequence and fracture in the finite element model.We also introduce the amplification factor to describe the effect of fracture to fluid conductivity.Since the polluted belt of the wall and fractures by drill fluid exists,we introduce the pollution coefficient to describe to the permeability decrease in the polluted belt.We use the simulating calculation of two models to get both pressure distribution and seepage flow velocity field,and then compare the results of tow models to give the theoretical evidence for well completion system election.

关 键 词：裂缝性气藏 渗流场 射孔完井 筛管完井 FEM 

分 类 号：TE257[石油与天然气工程—油气井工程]