自修复油井水泥石力学性能与微观结构  

Mechanical Properties and Microstructure of Self-healing Oil Well Cement

作　　者：刘仍光 LIU Rengguang(State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development,Beijing 102206;Sinopec Research Institute of Petroleum Engineering,Beijing 102206)

机构地区：[1]国家页岩油气富集机理与有效开发重点实验室,北京102206 [2]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》2021年第4期486-491,共6页Drilling Fluid & Completion Fluid

基　　金：国家自然科学基金企业创新发展联合基金项目"海相深层高温高压钻完井工程基础理论及控制方法"(U19B6003-05)。

摘　　要：关于自修复剂掺入水泥浆后对水泥石力学性能及微观结构的影响研究较少。自修复乳液掺量分别为0%、5%、10%、15%和20%,液固比均为0.44,各水泥浆试样在90℃水浴中养护3 d。结果表明,自修复乳液的掺入,降低了水泥石的弹性模量,随掺量的增加,水泥石的弹性模量降低较显著;自修复水泥石的强度高于普通水泥石,掺量较小时抗压强度更高,掺量较大时,抗折强度增幅更大。自修复乳液改变了水泥水化产物Ca(OH)_(2)晶体的微观形貌,使其不再呈叠片状堆积,而是乱向、松散分布且晶体形貌不规则,自修复胶粒沉淀分布于水化产物凝胶网络结构之间。自修复乳液降低了水泥石的孔隙率,增加了水泥石的平均孔径和最可几孔径。The mechanical properties and microstructure of self-healing cement were studied.The adding amount of self-healing emulsion was 0,5%,10%,15%and 20%respectively.The samples were cured under the condition of 90 degrees in the water for 3 days.The results showed that the elastic modulus of cement decreased with the incorporation of self-healing emulsion.With the increase of the dosage,the elastic modulus of cement decreased significantly.The strength of self-healing cement paste was higher than that of normal oil well cement.The compressive strength was higher with small amount addition,and the increase of flexural strength was greater with increase of addition.The microstructure of hydroxide crystal appeared scattered and loose instead of regular hexagonal.Self-healing colloidal particles were distributed between the network structures of hydration product gel.The porosity was reduced and the average and most probable pore size increased of self-healing cement.

关 键 词：油井水泥 自修复乳液 弹性模量 孔隙结构 微观形貌 

分 类 号：TE256.6[石油与天然气工程—油气井工程]