天然气地球科学 ›› 2022, Vol. 33 ›› Issue (11): 18951905.doi: 10.11764/j.issn.1672-1926.2022.05.005
• 天然气开发 • 上一篇
张钰祥1,2,3(),杨胜来1(),王蓓东1,王元昊1,邓惠4,鄢友军4,闫海军2,陈掌星3
Yuxiang ZHANG1,2,3(),Shenglai YANG1(),Beidong WANG1,Yuanhao WANG1,Hui DENG4,Youjun YAN4,Haijun YAN2,Zhangxing CHEN3
摘要:
超深层碳酸盐岩气藏埋藏深、温度高,高温对多类型储层渗流能力的变化规律尚不明确。选取高石梯—磨溪区块灯四段气藏储层岩心,通过测定升温和降温过程中岩样的气体单相渗透率和不同温度下的气水界面张力及气水两相相对渗透率,得到温度对多类型超深层碳酸盐岩气藏渗流能力的影响规律。研究结果表明:在20~120 ℃范围内,随温度改变,不同类型储层岩样气体单相渗流能力均呈幂函数变化,升温过程中气相渗透率下降受气体黏度升高、白云石晶体膨胀及岩石颗粒脆化后运移的共同影响,一次升温和降温后,缝洞型岩样由于微裂缝发育渗透率不可逆程度最高为82.52%,孔隙型岩样由于小孔喉发育次之为27.63%,孔洞型岩样最低为9.46%,缝洞型岩样为温敏型岩样,孔隙型和孔洞型岩样为耐温型岩样,多类型气藏的温度上限集中在44~50 ℃附近;温度升高主要通过降低水气黏度比来提高气驱水效率和气水两相渗流能力,地层温度下的水气黏度约为常温条件下的1/3,高温条件下多类型储层的气水相渗曲线更能代表实际地层的两相渗流特征。温度对多类型超深层碳酸盐岩气藏渗流能力的影响规律可为此类气藏的高效开发提供理论依据。
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