变导流能力下的压裂气井产能分析  

Study on Production of Vertical Fracture Gas Well under the Condition of Variable Conductivity

作　　者：熊健[1] 马强 肖峰 马倩 

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,成都610500 [2]长庆油田采油一厂数字化与科技信息中心,延安716000 [3]长庆油田苏里格气田研究中心,西安710016 [4]长庆油田采油一厂杏南作业区,延安716000

出　　处：《科学技术与工程》2013年第11期2948-2952,共5页Science Technology and Engineering

基　　金：西南石油大学研究生创新基金项目(GIFSS0701)资助

摘　　要：针对低渗气藏水力压裂后形成的垂直裂缝井中裂缝不同位置导流能力不同的特点,根据压后流体渗流规律变化,基于稳定流理论,考虑地层条件下气体PVT参数随压力变化而变化,推导了考虑垂直裂缝的不同位置导流能力不同的低渗气藏变导流垂直裂缝井产能的预测模型;并分析研究了各因素对产能的影响。研究结果表明:裂缝导流能力衰减系数对油井产能影响程度随井底压力的下降而增强,随裂缝长度的增加而减弱;当裂缝导流能力较小时,裂缝长度越长,裂缝导流能力衰减系数越大,气井产量越小;当裂缝导流能力较大时,裂缝长度越长,裂缝导流能力衰减系数越小,气井产量越大。In view of the flow conductivity of vertical fracture varying at different place after fracturing in the low permeability gas reservoirs, based on the change of fluid flow rule after fracturing, using the steady seepage theory, considering the gas PVT parameters in the condition of the formation pressure with pressure changes, a pre- diction model of the vertical fracture wells with varying conductivity was established in the low-permeability gas res- ervoirs, and the various factors on the oil well productivity were analyzed. The result shows that the degree of influ- ence of the attenuation coefficient on the gas well productivity increases along with the bottom hole pressure reduc- ing, which decreases along with the crack length enlargement. When the fracture conductivity capacity is small, the longer the crack length is, the bigger the attenuation coefficient is, the less the fracture gas well productivity. And when the fracture conductivity capacity is big, the longer the crack length is, the smaller the attenuation coeffi- cient is, the more the fracture gas well productivity.

关 键 词：低渗气藏 变导流 衰减系数 裂缝导流能力 

分 类 号：TE328[石油与天然气工程—油气田开发工程]