榆林低渗透气藏产水原因及其对开发的影响
Inner Mongolia Petrochemical Industry(2008)
Abstract
低渗透气藏常存在气水同产现象,其原因及其对气藏开发的影响受到很多油藏工程师的关注。本文通过对低渗透、气水同产气藏资料的统计和分析,解释了低渗透气藏产水的类型为凝析水、原始地层水和边、底水;孔喉毛管力作用导致气水同层,存在高气水过渡带,致使所有气井产水;在非均质条件下,某含气饱和度的气水界面并非水平面,而是呈不规则的起伏界面;气井产水导致井底附近地层导流能力降低、井筒积液降低生产井生产压差;平面上气井产水存在较大差异,局部区域产水量大,影响气藏开发。
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Key words
Drawdown pressure,Gas/water transition zone,Low permeability,Water gas contact,Capillary force,Flow conductivity,Water/gas ratio
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