摘要
实验所用泡沫酸FSH-1由氮气和无机酸、有机酸、发泡剂、稳泡剂及其他多种添加剂组成,目前在中原油田已获得广泛应用.采用具有规则网格孔隙通道的平面玻璃微观模型,研究泡沫酸的渗流特点,得到了20组温度(50～120℃)/压力(20～32 MPa)条件下泡沫酸的气液比,包括上限、下限及适宜值范围,结果表明形成稳定的连续泡沫流所需的气液比随温度升高略有增大,随压力升高显著增大;考虑到酸的有效穿透深度,泡沫酸的适宜气液比约为0.68.采用平面玻璃仿真微观模型(及规则微观模型),研究了泡沫酸的渗流特性,观测到了以下机理:①泡沫酸在仿真模型中流动时不断发生泡沫破灭和再生,其中包括气泡缩颈分离、液膜分离、气泡变形分割、气泡破裂聚并等现象;②泡沫酸优先进入较大孔道,产生贾敏效应,起液流转向作用;③气液比较大时,泡沫酸以相同流量通过模型时的压差较大;④泡沫酸中气泡大小可以通过气液比进行控制,气液比降低时泡沫中气泡直径减小;⑤泡沫酸连续流过仿真模型可引起模型两端压差持续增大,在规则模型中不发生此现象.图5表1参2.
The foamed acidizing fluid (FAF) taken in this study, FSH-1, is composed of nitrogen gas, inorganic and organic acids, foamer, foam stabilizer, and other additives and used widely nowadays in Zhongyuan oil fields.On a plate-like glass subminiature model (SMM) with network of regular orthogonally crossed passages (regular SMM), the flow behavior of FAF is studied and the gas to liquid ratio (GLR), including upper and lower limits and optimal range, is obtained for 20 temperature (70—120℃)/pressure (20—32 MPa) combinations.It is shown that the GLR needed for a stable, continuous foam flow through the reqular SMM to be occured is increased slightly with raising temperature and notably with raising pressure and the optimal GLR of FAF is of ca 0.68 with effective penetration depth of FAF taken into consideration.Through a plate-like glass simulation SMM replicating a reservoir (simulation SMM), the flow behavior of FAF is studied and following phenomena are observed:①continuous destroy/regeneration of FAF flowing in SMM invole phenonena such as bubble necking/splitting, film separation, bubble deformation/splitting, bubble destroy/coalescence, and others;②FAF preferencially entrances into big passages, causes Jaming effect and fluid diversion;③FAF of higher GLR exerts larger pressure differenc in simulation SMM at equal flow rate;④the bubble size in FAF can be controlled by changing GLR and the bubble diameter in FAF is larger with lower GLR;⑤continuous flow of FAF might arouse steady increase in pressure difference in simulation SMM but does not in regular SMM.
出处
《油田化学》
CAS
CSCD
北大核心
2005年第1期38-41,共4页
Oilfield Chemistry
关键词
泡沫酸
渗流特性
渗流机理
仿真模型
气液比
<Keyword>foamed acidizing fluid
flow behavior through porous media
flow mechanisms
simulation subminiature model
gas to liquid ratio
