新疆石油地质 ›› 2006, Vol. 27 ›› Issue (2): 210-212.

• 油藏工程 • 上一篇    下一篇

二项式产能方程系数异常情况(B 小于零) 分析

苟宏刚, 赵继承, 秦志保, 常勇峰   

  1. 中国石油长庆油田分公司气田开发处, 西安 710021
  • 收稿日期:2005-07-20 修回日期:2005-07-20 出版日期:2006-04-01 发布日期:2020-10-30
  • 作者简介:苟宏刚(1969-) , 男, 甘肃镇原人, 在读硕士研究生, 油气田开发,(Tel) 029-86594370.
  • 基金资助:
    中国石油天然气集团公司重大科技攻关项目, 苏里格气田经济有效开发技术(030125-1) 资助

Analysis of Abnormal Binomial Coefficient (B<0) for Binomial Deliver ability Equation

GOU Hong-gang, ZHAO Ji-cheng, QING Zhi-bao, CHANG Yong-feng   

  1. Department of Gas Development, Changqing Oilfield Company, Petro China, Xi'an, Shaanxi 710021, China
  • Received:2005-07-20 Revised:2005-07-20 Online:2006-04-01 Published:2020-10-30

摘要: 从理论上说, 二项式方程系数B 不可能为负值, 但在排除了文献中提及的井底积液影响的原因外, 仍然出现异常情况(B 小于零) , 致使现场无法进行产能解释和分析评价。针对这种现象, 通过理论分析认为, 对于低压低渗气藏,如果忽略了前期工作制度对后期动态的影响, 特别在每个工作制度生产后地层压力恢复较低的情况下, 就会产生气井产能曲线反转。经理论推导给出了使校正后的曲线既符合产能规律, 又能真实反映这类气井实际产能的推荐方程。通过对推荐方程进行实际验算, 其可靠性得到检验, 故可供类似低压低渗气田借鉴和应用。

关键词: 气井, 产能方程, 二项式, 系数, 异常

Abstract: Theoretically, the binomial coefficient B does not allow being negative value. But the abnormal situation (B<0) still occurs in practice without consideration of influence of bottom hole liquid loading, causing unable to make in-situ deliverability interpretation and evaluation. The study suggests that for a gas pool with low pressure and low permeability, if ignoring the influence of pre-working system on post-performance, especially under the pressure build-up insufficiency after each working-system operation, productivity curve style of a gas well will be reversed. This theoretical deduction presents recommended equation that not only accords with deliverability regularity, but also represents real productivity of a gas well after correcting curves. The case study with the recommended equation indicates its reliability and applicability to similar gas pools.

Key words: gas well, deliverability equation, binomial coefficient, abnomity

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