储能微球的封装方法  

Encapsulation of Energy-storage Microspheres

作　　者：梁继文 刘和兴 王成龙 黄静 沈晟达 柳华杰[2] LIANG Jiwen;LIU Hexing;WANG Chenglong;HUANG Jing;SHEN Shengda;LIU Huajie(Zhanjiang Branch of CNOOC(China)Co.,Zhanjiang Guangdong 524057;School of Petroleum Engineering,China University of Petroleum,Qingdao Shandong 266580)

机构地区：[1]中海石油(中国)有限公司湛江分公司,广东湛江524057 [2]中国石油大学(华东)石油工程学院,山东青岛266580

出　　处：《钻井液与完井液》2022年第2期214-220,共7页Drilling Fluid & Completion Fluid

基　　金：国家青年基金“水合物层固井水泥热能存储剂载体研制及承载机理研究”(51804332)。

摘　　要：为了保证在海洋深水油气井固井时水合物的稳定,需要在固井时使用低水化热水泥浆。目前的方法是在油井水泥中加入热能存储剂,但是将热能存储剂直接在水泥浆体系中应用,会出现配伍性差的问题。将热能存储剂吸收进入高强度载体微球内形成储能微球,可避免热能存储剂与水泥浆直接接触,是解决热能存储剂对固井水泥浆不利影响的有效措施。但是由于载体微球球壁开孔,热能存储剂仍然会从载体微球中泄漏,因此需要对储能微球进行封装。针对现有封装技术存在成本高、耗时长等问题,建立了以丙烯酸树脂为封装材料,利用喷涂法对载体微球进行封装的工艺,并对储能微球的封装效果进行评价优化,得到最合适的丙烯酸树脂的质量分数为20%,最终形成了一套简单高效的储能微球封装方法。封装的储能微球具有很好的抗压、耐温、耐碱性能,能够在海水环境中长时间稳定存在,为解决热能存储剂与水泥浆不配伍难题开辟一条新的途径,对有效封隔天然气水合物层具有重要的意义,同时也可为其他油井水泥外加剂载体研发提供借鉴。To maintain the gas hydrate in stable conditions during deep offshore well cementing,a cement slurry with low heat of hydration should be used.Presently this is realized by adding heat energy storage agents in the oil well cement.The problem with this method is that the heat energy storage agent directly added into the cement slurry has poor compatibility.If the heat energy storage agent is absorbed into a high strength carrier microsphere to form an energy storage microsphere,the direct contact of the heat energy storage agent with the cement slurry can be avoided,and this should be an effective measure to solve the negative effects of heat energy storage agents on cement slurries.Opening of carrier microsphere walls will cause the leaking of the heat energy storage agent from the carrier microspheres,encapsulation of the microspheres is thus necessary.A new encapsulation methos is required to solve the problems existed with the existing encapsulation technology such as high cost and time consuming.In laboratory experiment,acrylic acid resin was chosen as the encapsulation material,and the carrier microspheres were encapsulated with spray method.Evaluation of the encapsulation showed that the best encapsulation can be achieved at a acrylic acid resin mass fraction of 20%.A simple efficient encapsulation method was thus developed.The energy storage microspheres thus encapsulated have good compressive strength,good high temperature stability and good resistance to alkaline environment.They can stay in marine environment for a long time.The development of this encapsulation technology and the energy storage microspheres has opened a new way of solving the incompatibility between heat energy storage agent and cement slurry,and is important to the effective isolation of natural gas hydrate.It has also provided a clue for the development of additive carriers for oil well cement.

关 键 词：储能微球 油井水泥 丙烯酸树脂 封装方法 

分 类 号：TE256.6[石油与天然气工程—油气井工程]