油气藏评价与开发 ›› 2018, Vol. 8 ›› Issue (1): 34-37.

• 油气藏评价 • 上一篇    下一篇

考虑多因素的低渗透气藏压裂井产能公式分析

尹鹏1,魏俊1,张志军1,吴东明2,吴慎渠1,徐浩1,徐良1,华科良1   

  1. 1. 中海油能源发展股份有限公司工程技术分公司,天津 300452
    2. 中海石油(中国)有限公司天津分公司,天津 300452
  • 收稿日期:2017-03-13 出版日期:2018-02-26 发布日期:2018-12-05
  • 作者简介:尹鹏(1988—),男,工程师,油藏动态分析及提高采收率研究。

Analysis of low permeability gas reservoir fracturing well productivity equation considering multi-factors

Yin Peng1,Wei Jun1,Zhang Zhijun1,Wu Dongming2,Wu Shenqu1,Xu Hao1,Xu Liang1,Hua Keliang1   

  1. 1. CNOOC EnerTech-Drilling and Production Co., Tianjin 300452, China
    2. CNOOC Energy Technology and Services Limited Tianjin Branch, Ltd., Tianjin 300452, China
  • Received:2017-03-13 Online:2018-02-26 Published:2018-12-05

摘要:

为了更加准确地预测低渗透气藏压裂井产能,应综合考虑产能影响参数的影响。研究表明:低渗透气藏启动压力梯度与储层平均渗透率呈幂函数关系,介质变形作用使得低渗透储层应力敏感效应较为严重;滑脱效应使得气体渗流阻力减少,气井产能增大。因此基于保角变换原理,建立了考虑应力敏感、滑脱效应、变启动压力梯度因素的压裂井产能预测模型,并研究了各因素对气井产能的影响。结果表明:随着应力敏感系数的增大,气井产量下降,且对低井底流压影响更大;井底流压越低,气井产量随滑脱系数的增大而变化的越明显;启动压力梯度系数在一定范围内对气井产能的影响较大。因此,对于低渗透气藏压裂井产能的预测,需要考虑多因素对气井产能的影响。

关键词: 低渗气藏, 压裂井, 产能方程, 变启动压力梯度, 应力敏感, 滑脱效应

Abstract:

In order to accurately predict the well capacity in the fracture of the low permeability gas reservoir, it is necessary to consider the multi-factors. The studies show that the relation between the threshold pressure gradient and the average reservoir permeability of the low permeability gas reservoir is the power function. The deformation of the media function makes the stress sensitive effect more serious, and the slippage effect makes the gas seepage resistance down and increases the well productivity. According to the conformal transformation theory, we established a prediction model of fracturing well productivity, which considered the stress sensitivity, the slippage effect and the changed threshold pressure gradient, and studied the effects on the productivity. The results showed that, with the increase of the stress sensitivity coefficient, the gas well output decreases, and the pressure of the low well bottom flow is more affected. The lower the flow pressure of the bottom hole is, the more obvious the gas well output changes with the increase of slip coefficient. The threshold pressure gradient factors greatly affect the well productivity in a certain range. Therefore, it is necessary to consider the influence of many factors on the gas well productivity in the prediction of the production capacity of the low permeability gas reservoir.

Key words: low permeability gas reservoir, fracturing well, productivity equation, variable threshold pressure gradient, stress sensitivity, slippage effect

中图分类号: 

  • TE357.1