通过岩石抗压强度测定评价酸液性能  

Acidizing fluid performance evaluation by measuring compressive strength of rock

作　　者：康燕[1] 李爱辉 单永卓[1] 杨宝泉[1] 

机构地区：[1]大庆油田采油工程研究院 [2]西安长庆钻宇实业集团有限公司

出　　处：《钻井液与完井液》2005年第2期66-67,共2页Drilling Fluid & Completion Fluid

摘　　要：针对大庆外围葡萄花油层酸处理所需的氢氟酸与储层岩心的酸岩反应对岩石抗压强度的影响情况,进行实验研究,即通过模拟油藏条件的岩石力学参数测定,获得酸化前后岩石抗压强度的变化情况。实验结果显示,储层温度高、增加酸液浓度、加大酸液用量、延长反应时间,都会降低岩石的抗压强度。降低酸液浓度和用量有利于保护岩石骨架,避免近井眼岩石酸化后造成孔隙坍塌和加速微粒运移。表明了岩石抗压强度的测定是一种评价酸液性能好坏的必要手段,对现场酸液浓度、用量及关井反应时间的确定具有指导意义。In this paper, the variation of rock compressive strength before and after acidizing was investigated, based on the acid-rock reaction characteristic of hydrofluoric (HF) acid and reservoir rock in Putaohua layer of Daqing oilfield. Tests were carried out under simulated reservoir condition. Results revealed that the compressive strength of rock is reduced when any aspect of the followings appears, higher formation temperature, higher acid concentration, more acidizing fluid volume or longer acid-rock reaction time. Thus reducing acid concentration or the fluid volume will be benefit for rock structure protection, preventing formation collapse and particle migration in near- wellbore region after acidizing. Tests established that rock compressive strength measurement is a necessary tool to evaluate acidizing fluid performance and rig-site application.

关 键 词：酸液 关井 储层岩心 微粒运移 井眼 油层 酸化 岩石骨架 油藏条件 孔隙 

分 类 号：TE357[石油与天然气工程—油气田开发工程] TE258