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对陕甘宁盆地东部上古生界砂岩气藏进行较系统的敏感性试验研究及损害因素分析。结果表明,该区(以下石盒子组为代表)粘土含量高,水敏及微粒迁移严重,孔喉细微,亲水性强,毛管压力高,含水饱和度高,对压力敏感,具有典型低渗砂岩气层的显著特点。水锁效应、水敏效应及微粒迁移是其主要损害原因,而压力敏感性又加剧了损害程度及克服的难度。这些损害主要与“水”有关。因此,改变钻井液完井液的性质(增强抑制性、改变润湿性质,降低表面张力等)和减少侵入量是控制其损害的主要着眼点,如何降低或缓和压力敏感性对损害的加剧作用及克服难度也应予以充分重视。
Systematic and Sensitive Experimental Study and Damage Factors Analysis of Upper Paleozoic Sandstone Gas Reservoirs in the Eastern Shaanxi-Gansu-Ningxia Basin. The results show that this area (represented by the Shihezi sub-group) has high clay content, severe water and microparticle migrations, fine pore throats, strong hydrophilicity, high capillary pressure and high water saturation, which is sensitive to pressure and has typical low permeability Sandstone gas reservoir of the salient features. Water lock effect, water sensitivity effect and particle migration are the main causes of damage, and the pressure sensitivity aggravates the degree of damage and the difficulty of overcoming. These damages are mainly related to “water”. Therefore, changing the properties of drilling fluid completions (enhancing inhibition, changing wetting properties, reducing surface tension, etc.) and reducing intrusion are the main points of control over damage and how to reduce or mitigate the aggravating effects of pressure sensitivity on damage And to overcome the difficulty should also be given full attention.