低渗透气藏低压低产气井解水锁技术研究及应用

Petroleum Geology and Recovery Efficiency(2011)

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Abstract
川西中浅层低渗透致密砂岩气藏储层物性差,含水饱和度高,气井产能较低,普遍存在水锁伤害,严重影响了采气中后期气井的正常生产。以室内实验为手段,研究了水锁伤害程度,定量分析了解水锁剂对天然气渗流的改善作用。研究结果表明,低渗透致密砂岩气井采气中后期近井储层积液会引起严重的水锁伤害,影响了天然气在储层中的渗流能力,解水锁剂可降低近井储层的含水饱和度,改善岩心渗透率,降低储层中天然气启动压差。解水锁剂HY在A井现场试验后,该井在油压和套压变化不大的情况下,5个月累积增产气量为24×10~4m~3,单井增加经济效益为19×10~4元。
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Key words
low-permeability gas field,start up pressure differential,water unlocking,water lock damage,low pressure and productivity gas well
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