天然气地球科学 ›› 2021, Vol. 32 ›› Issue (9): 14101420.doi: 10.11764/j.issn.1672-1926.2021.06.002
• 天然气开发 • 上一篇
李彬册1,2(),赖枫鹏1,2(),赵立斌3,许东东3,逯广腾1
Bince LI1,2(),Fengpeng LAI1,2(),Libin ZHAO3,Dongdong XU3,Guangteng LU1
摘要:
致密气储层气水关系复杂,气井产能会随着气井见水而迅速降低。为明确致密气储层流体赋存与气水共渗规律,以定北区块和大牛地区块致密气储层为研究对象,采用渗吸、离心、核磁共振和气水驱替等实验方法,研究压裂过程中流体含量变化、动态分布以及生产过程中气水两相共渗规律。结果表明:在压裂过程中,致密气储层岩心对压裂液的自发渗吸先快后慢,流体先进入较小孔隙中,流体分布随渗吸时间增大而更加集中。在返排过程中,较大孔隙中的流体在返排时优先排出,存在可动流体向束缚流体的转变。同时还分析了储层物性参数与流体赋存的关系,渗吸量、返排率与岩石物性存在正相关关系。定北区块气水相渗曲线束缚水饱和度大,共渗区小,在生产过程中储层内气水两相干扰严重,见水后气相相对渗透率迅速降低。
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