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白云岩储层酸岩反应控制模式界限
赫安乐1,齐宁2,3,崔明月1,潘林3,晏军1,李艺恬3
(1.中国石油勘探开发研究院,北京 100083;2.非常规油气开发教育部重点实验室(中国石油大学(华东)), 山东青岛 266580;3.中国石油大学(华东)石油工程学院,山东青岛 266580)
摘要:
为明确白云岩储层酸岩反应控制模式界限,以中亚某区块白云岩储层岩心为对象,开展酸岩反应动力学试验和数值模拟研究,并通过扫描电镜对比分析灰岩与白云岩酸蚀机制的差异;建立不同因素控制下的白云岩酸岩反应动力学方程,明确温度90 ℃、转速500 r/min为表面反应控制模式、表面反应和传质共同控制模式的界限。结果表明:相同试验条件下,随着白云质体积分数的升高,酸岩反应速度迅速降低;当白云质体积分数超过75%时,酸岩反应速度降到最低并趋于稳定;白云岩储层的酸压改造方向应区别于灰岩储层,在允许范围内可以适当提高酸岩反应速度,以改善裂缝壁面的非均匀刻蚀程度,增大酸蚀裂缝的导流能力。
关键词:  酸压  酸岩反应动力学  白云岩  反应控制模式  非均匀刻蚀
DOI:10.3969/j.issn.1673-5005.2021.01.013
分类号::TE 357.2
文献标识码:A
基金项目:
Limitation on acid-rock reaction and its control mode in dolomite formation
HE Anle1, QI Ning2,3, CUI Mingyue1, PAN Lin3, YAN Jun1, LI Yitian3
(1.Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China;2.Key Laboratory of Unconventional Oil & Gas Development (China University of Petroleum (East China)), Ministry of Education, Qingdao 266580, China;3.School of Petroleum Engineering in China University of Petroleum (East China), Qingdao 266580, China)
Abstract:
In order to define the limitation of acid-rock reaction and its control mode of dolomite reservoirs, the kinetics experiments of acid-rock reaction and numerical simulation were carried out, using rock cores from a dolomite reservoir in Central Asia. The difference of acid erosion mechanisms on limestone and dolomite was analyzed by scanning electron microscope. An acid-rock reaction kinetics model in dolomite cores under different conditions was established. The limits of surface reaction and mass transfer control mode were defined at 90 ℃, with stirring rate of 500 r/min. The results show that, under the same testing conditions and with the increase of the dolomite content, the acid-rock reaction rate decreases rapidly. When the dolomite content exceeds 75%, the acid-rock reaction rate decreases to a lowest level and tends to be stable. Therefore, the acid fracturing transformation direction in dolomite reservoirs should be different from that in limestone reservoirs, and acid-rock reaction rate can be appropriately increased within an allowable range in order to enhance the uneven erosion on the fracture wall and increase the conductivity of acid eroded fractures.
Key words:  acid fracturing  acid-rock reaction kinetics  dolomite  reaction control mode  inhomogeneous erosion
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