低渗气藏变导流垂直裂缝井产能分析  

Deliverability analysis on the variable conductivity vertical fracture well of low permeability gas reservoirs

作　　者：熊健[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：《油气藏评价与开发》2013年第3期23-26,42,共5页Petroleum Reservoir Evaluation and Development

基　　金：西南石油大学研究生创新基金项目(GIFSS0701);重庆市石油与天然气基金项目计划重点课题(KJ2011002)

摘　　要：根据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,回归并建立了按线性、指数及对数3种形式的变导流能力的数学模型。针对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参数动态变化,推导了按线性、指数及对数3种形式变化的低渗气藏变导流能力的垂直裂缝气井的产能预测模型,并分析研究了裂缝导流能力的不同变化形式对气井产能的影响。研究结果表明:与考虑常导流能力的垂直裂缝气井产能相比,考虑变导流能力的垂直裂缝气井产能将下降;按线性、指数及对数3种形式的变导流能力对垂直裂缝气井产能影响程度不一致,同时3种形式的变导流能力的系数越大,垂直裂缝气井产能下降幅度越大。On the basis of the different flow conductivity at different place in the fracture of vertical fractured wells after fracturing in the low permeability gas reservoirs, the mathematical models of the flow conductivity was established by three forms of the linear- ity, index and logarithm. Aiming at the different flow conductivity at different place in the fracture of vertical fractured wells, based on the fluid flow rule changes after fracturing, in view of the steady seepage theory and considering the dynamic changes of the gas PVT parameters under the formation conditions, this paper derived the deliverability prediction model of the vertical fractured gas wells with varying flow conductivity in the low permeability gas reservoirs by three forms of linearity, index and logarithm, and ana- lyzed the influence of different variations of the fracture flow conductivity on the gas well deliverability. The results show that com- pared with constant flow conductivity, the gas well deliverability with varying flow conductivity will decrease. The effects of three forms of varying flow conductivity on the gas well productivity were different. The larger the coefficients of three forms of varying flow conductivity are, the more the production of the vertical fracture gas wells will decrease.

关 键 词：低渗气藏 变导流 气体PVT 垂直裂缝 裂缝导流能力 

分 类 号：TE312[石油与天然气工程—油气田开发工程]