天然气水合物层固井用相变微胶囊的制备及应用  

Preparation and Application of Phase Change Microcapsules for Gas Hydrate Layer Cementing

作　　者：王龙[1,2] 吴佳容 彭志刚[3] 赫英状 张云 WANG Long;WU Jiarong;PENG Zhigang;HE Yingzhuang;ZHANG Yun(Petroleum Engineering Technology Research Institute of Northwest Oilfield Branch of Sinopec,Urumqi 830000,China;Key Laboratory of Enhanced Oil Recovery for Fractured-Vuggy Reservoir of Sinopec,Urumqi 830000,China;College of Chemistry and Chemical Engineering,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]中国石化西北油田分公司石油工程技术研究院,新疆乌鲁木齐830000 [2]中国石化缝洞型油藏提高采收率重点实验室,新疆乌鲁木齐830000 [3]西南石油大学化学化工学院,四川成都610500

出　　处：《合成化学》2023年第7期519-526,共8页Chinese Journal of Synthetic Chemistry

基　　金：顺北一区5号断裂带提质提速钻完井技术研究项目(P20002)。

摘　　要：在深水低温固井中,水泥浆水化放热极易导致天然气水合物的分解,对固井作业构成威胁。本文采用界面聚合法合成了一种相变微胶囊材料(MPCM),通过FT-IR、SEM和DSC等对MPCM的化学结构、微观结构和相变特性等进行了研究。结果表明,MPCM为规则球形结构,表面粗糙,粒径分布均匀,平均粒径为24.51μm。MPCM的熔点和相变焓分别为30.52℃和70.60 J/g,包封率为62.91%。通过将MPCM加入油井水泥中,采用自制的半绝热式水化热测试装置得到了不同MPCM加量下水泥浆的水化温升和水化热分布曲线。结果表明:水泥浆的水化温升和水化热不断下降,当MPCM加量为12%(物质的量分数)时,水泥浆水化温升T_(r)下降了22.28%,24 h水化放热Q_(24 h)下降了28.46%。微胶囊MPCM可有效控制水泥浆的热发展,降低深水天然气水合物层的固井风险。In deep-water low-temperature cementing, the hydration heat release of cement slurry can easily lead to the decomposition of natural gas hydrate, which poses a threat to cementing operations. In this paper, a phase-change microcapsule material(MPCM) was synthesized by interfacial polymerization. The chemical structure, microstructure and phase-change properties of MPCM were studied by FT-IR, SEM, and DSC. The results showed that the MPCM had a regular spherical structure with a rough surface and a uniform particle size distribution with an average particle size of 24.51 μm. The melting point and phase change enthalpy of MPCM are 30.52 ℃ and 70.60 J/g, respectively, and the encapsulation efficiency is 62.91%. By adding MPCM to oil well cement, the hydration temperature rise and hydration heat distribution of cement slurry under different MPCM addition amounts were obtained by using a self-made semi-adiabatic hydration heat test device. The results showed that the hydration temperature and heat of hydration of the cement slurry decreased continuously. When the amount of MPCM was 12%, T_(r) decreased by 22.28%, and Q_(24 h) decreased by 28.46%. Microencapsulated MPCM can effectively control the thermal development of cement slurry and reduce the cementing risk of deepwater natural gas hydrate layers.

关 键 词：天然气水合物 相变微胶囊 低温固井 水化热 制备 

分 类 号：TE256[石油与天然气工程—油气井工程] TE58