摘要
大牛地气田为典型致密低渗气田,具有低渗、低压、低产的特点,经济有效开发难度大。由于对该构造储层地质特征及引起储层伤害的潜在因素的认识不充分,引入钻、完井液等外部介质直接与储层接触,对储层造成伤害,使得气井产能下降。文章以大牛地致密低渗气藏为研究对象进行储层流体和应力敏感性评价实验,以及完井液和压裂液对油气层的伤害评价实验,分析其结果并对储层伤害做出了系统的评价。结果表明,大牛地气藏流体伤害主要是以碱敏和盐敏为主,岩心渗透率随着有效应力的增加而降低,并且压力降低后渗透率只能够部分恢复,造成不可逆伤害。
Daniudi gas field is a typical tight low-permeability gas field with low permeability, low pressure and low yield. It is difficult to develop economically and effectively. Because of the insufficient understanding of the geological characteristics of the reservoir and the potential factors causing reservoir damage, the introduction of drilling, completion fluid and other external media directly contact with the reservoir, damage to the reservoir, resulting in a decline in gas well production. Taking Daniudi tight low-permeability gas reservoir as the research object, through the sensitivity evaluation experiments and drilling, completion fluid damage evaluation of the gas reservoir. Analysis of the results and make the system evaluation of the damage to the reservoir. The results show that Daniudi gas reservoir fluid damage mainly to alkali and salt sensitivity and core permeability decreases with the increase of effective stress, and permeability only partially recovered after the step-down, causing irreversible damage to the permeability.
出处
《广东化工》
CAS
2016年第1期10-12,共3页
Guangdong Chemical Industry
关键词
致密低渗气田
储层伤害
有效应力
渗透率
tight-low permeability gas field
reservoir damage
effective stress
permeability
