新型油井水泥缓凝剂的研制  

Development of New Oil Well Cement Retarder

作　　者：刘建[1] 张泽宇 魏浩光[1] 王牧 周仕明[1] LIU Jian;ZHANG Zeyu;WEI Haoguang;WANG Mu;ZHOU Shiming(Sinopec Research Institute of Petroleum Engineering,Beijing 100101)

机构地区：[1]中国石化石油工程技术研究院,北京102206

出　　处：《钻井液与完井液》2022年第5期615-621,共7页Drilling Fluid & Completion Fluid

摘　　要：针对大温差长裸眼固井施工中,高温高压下缓凝剂加量敏感或者失效,水泥浆稠化时间缩短或不规律;施工结束后,长封固段顶部强度缓凝会导致气窜和密封完整性失效的现状。通过正交实验优化实验方案,合成耐高温有机缓凝剂,再采取有机-无机杂化的方式匹配适合的无机增强材料,利用无机和有机杂化的方法,设计层状结构,使有机材料能插层或者键合到无机材料表面。在油井水泥浆经历的低温-高温-低温过程中,随无机材料层间距的变化,低温时无机材料起增强主导作用,高温时有机材料起缓凝主导作用。优选了层状石墨烯类和双电子层水滑石类2种无机增强材料,根据无机材料本身的特点研制2种新型油井水泥缓凝剂,其中层状石墨烯类缓凝剂适应性强,耐温能力达150℃,110℃大温差条件下72 h强度大于7 MPa;双电子层水滑石类缓凝剂耐温能力也达150℃,加入该类缓凝剂的水泥浆流变性能易于调节,水化初期强度发展较快,但后期增强能力不如层状石墨烯类缓凝剂。上述缓凝剂室内制备工艺简单,原料易得,具有广阔的推广应用前景。In cementing a long open section well with big temperature differences,overtreatment or inadequate treatment of the cement slurry with retarders at high temperature high pressure will cause the thickening time of the cement slurry to shorten or change irregularly.After the cementing job,the retarding of the top of a long cementing section will cause gas channeling and failure of the sealing integrity of the cement sheath.Through optimized orthogonal experiment,a high temperature organic retarder was developed.By hybridizing an organic material and an inorganic material,and designing a layered structure,the organic material can be intercalated into or bonded with the surfaces of the inorganic material.The cement slurry in the cementing operation will experience a low temperature–high temperature–low temperature process,during which the spacing between the layers of the inorganic material will change with the process.At low temperatures,the inorganic material will dominate the strengthening action,while at high temperatures,the organic material dominates the retarding action.Two inorganic strengthening materials,one is a layered graphene,and the other a double electron layered hydrotalcite,were selected for developing two kinds of new oil well cement retarders.The graphene retarder has good adaptability,it is stable at 150℃,and its 72 h strength at 110℃temperature difference is greater than 7 MPa.The double electron layered hydrotalcite is also stable at 150℃.Cement slurries treated with the hydrotalcite retarder have rheology that is easy to adjust,and the initial strength develops fast,but the late strength development is not as good as that of the graphene retarder.These retarders can be produced with simple techniques,the raw materials are easy to obtain,and therefore,will have broad promotion and application prospects.

关 键 词：缓凝剂 大温差 水泥浆 固井 

分 类 号：TE256.6[石油与天然气工程—油气井工程]