MgO作为油井水泥膨胀剂的研究现状与展望  

Status Quo of Research on and Prospect of MgO as Oil Well Cement Expansion Agent

作　　者：顾光伟 冯竟竟[2] 刘仍光[3] 侯维红 杨进波 

机构地区：[1]武汉三源特种建材有限责任公司,湖北武汉430000 [2]山东农业大学水利土木工程学院,山东泰安271018 [3]中国石化石油工程技术研究院,北京100101

出　　处：《钻井液与完井液》2017年第6期67-72,共6页Drilling Fluid & Completion Fluid

摘　　要：随着对稠油井、超深井等高温井开采力度的加大,CaO及钙钒石类传统油井水泥膨胀剂因其高温性能不稳定而无法满足固井需要,以MgO为主要成分的镁质油井水泥膨胀剂有望在高温井固井中得到更为广泛的应用。列举了MgO膨胀剂应用于油井水泥的国内外研究成果,从中可以得出,MgO煅烧温度须与使用温度满足一定的匹配关系;高掺量(12%)MgO可优化80℃三维受限状态的水泥石孔径并提高其抗压强度,但5%~10%掺量的MgO会降低135~150℃下加砂水泥石的抗压强度;水泥石因MgO产生的径向膨胀能够显著提高二界面胶结强度,改善封隔质量,对存在劣质泥饼的二界面胶结强度亦有增强效果。以上结果对以MgO为主要成分的高温复合型防窜剂研究及应用推广具有一定的指导意义。As petroleum production is moving forward to the production of heavy oil and oils from ultra-deep wells, conventional oil well cement expansion agents, such as CaO and ettringite are no longer able to satisfy the needs of well cementing because of their deficiency in high temperature performance.Oil well cement expansion agents with MgO as the main component, is expected to find wide application in oil well cementing. This paper listed the research findings made abroad in the application of MgO in oil well cement. From these researches it was found that there must be a matching between the calcination temperature of MgO and the operation temperature. High concentration（12%） of MgO can be used to optimize the pore sizes of set cement with 3 D constrained state at 80 ℃ and to enhance the compressive strength of the set cement. At concentrations between 5%-10%, MgO would reduce the compressive strength of sand-contained set cement at 135 ℃-150 ℃. The existence of MgO in set cement helps improve the bonding between the interfaces between cement sheath and borehole wall because of the radial expansion of the set cement caused by MgO. The quality of sealing of the annular space is thus improved and interfaces between cement sheath and borehole wall in which mud cakes of poor quality also has its strength enhanced. This paper is of guidance in the study, application and popularization of high temperature compound anti-channeling agents with MgO as the main component.

关 键 词：固井 MGO 油井水泥 膨胀剂 防窜 胶结强度 

分 类 号：TE256[石油与天然气工程—油气井工程]