摘要
东胜气田位于鄂尔多斯盆地北部,地质构造复杂,气水关系复杂,明确致密砂岩含水气藏不同尺度裂缝内气水两相渗流规律是提高压裂设计针对性的关键。以锦72井区气水同层气藏为研究对象,开展多尺度裂缝内气水两相渗流规律研究。研究认为,未充填裂缝内气水重力分异严重,临界含水饱和度26%~38%,充填裂缝内气水重力分异程度小于未充填裂缝,临界含水饱和度14%~21%;驱替压差增加,未充填及充填裂缝内的含水饱和度均先降低,降至临界含水饱和度后保持不变;气水两相流动时,未充填和充填裂缝内含水饱和度主要受气水比和缝宽的影响;同时改性支撑剂水相相渗较高,两相区较大,束缚水饱和度低于亲水支撑剂,留在缝内的水少,最终使得产气量增加。
Dongsheng Gas Field is located in the northern part of the Ordos Basin.The geological structure is complicated and the relationship between gas and water is complex.The key to improving targeted fracture design is to make clear about the gas-water two-phase infiltration law of multi-scale fractures in water-cut gas reservoir with dense sandstone.Toking Jin 72 well district as the research object,this paper studies the two-phase infiltration law between gas and water in multi-scale frac-tures.The study finds that gas-water gravity differentiation is severe in fractures not filled with water and the critical water saturation is 26%~38%,while gas-water gravity differentiation in fractures filled with water is less severe and the critical water saturation is 14%~21%;when the pressure difference increases,the water content in two kinds of fractures is reduced first,and it remains un-changed when reaching the critical water saturation;when the two phases of gas and water flow,the water content in two kinds of fractures is mainly affected by gas-water ratio and width of sewing;meanwhile,the water phase of modified support agent is high,the two-phase area is large,water saturation is lower than hydrophilic support agent,thus,the amount of water kept in the seam is less,which eventually increases gas production.
作者
陆姣平
LU Jiao-ping(Research Institute of Petroleum Engineering Technology,Sinopec North China Oil and Gas Company,Zhengzhou 450006,Henan,China)
出处
《承德石油高等专科学校学报》
CAS
2023年第5期55-59,91,共6页
Journal of Chengde Petroleum College
关键词
东胜气田
不同尺度裂缝
临界含水饱和度
气水两相渗流规律
Dongsheng Gas Field
fractures of different scales
critical water saturation
gas-water two-phase infiltration law
