镁橄榄石对油井水泥抗CO_(2)腐蚀性能的影响  

Effect of magnesium olivine on CO_(2) corrosion resistance of oil well cement

作　　者：郑怡杰 龚鹏 邓卓然 何鑫 张春梅[1] 梅开元[1] 程小伟[1] ZHENG Yijie;GONG Peng;DENG Zhuoran;HE Xin;ZHANG Chunmei;MEI Kaiyuan;CHENG Xiaowei(School of New Energy and Materials,National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]西南石油大学新能源与材料学院,油气藏地质及开发工程全国重点实验室,四川成都610500

出　　处：《中国粉体技术》2024年第2期151-163,共13页China Powder Science and Technology

基　　金：国家自然科学基金项目,编号:42207206。

摘　　要：【目的】研究镁橄榄石掺加对减轻超临界CO_(2)环境下油井水泥石的腐蚀渗透性能。【方法】以镁橄榄石粉为外掺料配制不同的油井水泥,分析温度为150℃,CO_(2)总压为50 MPa条件下镁橄榄石水泥石的抗压强度,优选出镁橄榄石粉的最佳掺量;利用渗透率、热重分析(thermo gravimetric analysis,TGA)、X射线衍射(X-Ray diffraction,XRD)和扫描电子显微镜(scanning electron microscope,SEM)进行测试,评价镁橄榄石对油井水泥石抗CO_(2)腐蚀性能的影响,分析镁橄榄石对油井水泥石抗CO_(2)腐蚀的作用机制。【结果】镁橄榄石粉的掺入不会影响油井水泥的流动度,当镁橄榄石粉的质量分数为2%时,对比腐蚀前油井水泥石的,抗压强度提高35.47%,渗透率降低0.0104 m D;腐蚀28 d后,镁橄榄石水泥石的抗压强度为空白水泥石的193.71%,且仍高于腐蚀前。【结论】镁橄榄石是一种抗CO_(2)腐蚀外加剂,能提升油井水泥的抗CO_(2)腐蚀性能。Objective Using CO_(2) injection to enhance oil and gas recovery is crucial in the carbon neutralization process.However,the presence of supercritical CO_(2) in CCUS wells poses higher demands on the corrosion resistance of wellbore cement.Magnesium olivine,characterized by abundant sources and low cost,has been extensively studied in the field of construction cement.Yet,research on enhancing the resistance of wellbore cement to CO_(2) corrosion using magnesium olivine is relatively limited.In this study,conducted in the unique environment of CCUS wells,corrosion experiments will be carried out using supercritical CO_(2)-saturated solutions.Various testing methods,including compressive strength,permeability,X-ray diffraction(XRD),thermogravimetric analysis (TGA),and scanning electron microscopy (SEM),will be employed to investigate the optimal dosage of magnesium olivine and its role in the micro-mechanism of corrosion resistance.This research aims to provide new theoretical and practical support for enhancing the resistance of wellbore cement to CO_(2) corrosion,contributing technological solutions towards achieving the“carbon neutrality and peak carbon”goals.Methods Utilizing layered olivine magnesium with an average particle size of 23μm as an additive and cement slurry with a density of 1.92 g/cm^(3),oil well cements with varying additive concentrations (0,0.5%,1%,1.5%,2%,2.5%and 3%) were formulated and cured following GB/T 19139—2012.Under conditions of 150℃and 50 MPa CO_(2) pressure,compressive strength and permeability were tested for both blank samples and samples with magnesium olivine,aiming to identify the optimal dosage of magnesium olivine.Thermal gravimetric analysis (TGA),X-ray diffraction (XRD),and scanning electron microscopy(SEM) were employed to analyze the impact and mechanisms of magnesium olivine on the CO_(2) corrosion resistance performance of the cement slurry.Results and Discussion Formulated cement slurries with different concentrations(0,0.5%,1%,1.5%,2%,2.5%and 3%) of magnesiu

关 键 词：镁橄榄石 超临界二氧化碳 腐蚀 油井水泥石 

分 类 号：TE256[石油与天然气工程—油气井工程] TB4[一般工业技术] TQ324.8[化学工程—合成树脂塑料工业]