适用于低温地层的纳米复合水泥浆体系研究  

Research on a Nano-Composite Cement Slurry System Suitable for Low-Temperature Formations

作　　者：王胜[1] 谌强 袁学武[1] 华绪 陈礼仪[1] WANG Sheng;CHEN Qiang;YUAN Xuewu;HUA Xu;CHEN Liyi(State Key Laboratory of Geohazard Prevention and Geoenvironment Protection(Chengdu University of Technology),Chengdu,Sichuan,610059,China;Sichuan Tibet Expressway Co.,Ltd,Chengdu,Sichuan,610041,China)

机构地区：[1]地质灾害防治与地质环境保护国家重点实验室(成都理工大学),四川成都610059 [2]四川藏区高速公路有限责任公司,四川成都610041

出　　处：《石油钻探技术》2021年第6期73-80,共8页Petroleum Drilling Techniques

基　　金：国家自然科学基金项目“纳米复合水泥浆液低温水化过程与流变凝固特性研究”(编号:41672362);珠峰科学研究计划项目“青藏高原深部找矿快速绿色智能钻进关键技术研究”(编号:80000-2020ZF11411)部分研究内容。

摘　　要：为解决低温地层钻探过程中的井壁坍塌和井漏问题,研制了适用于低温地层的纳米复合水泥浆。采用宏观试验与微观分析相结合的方法,研究了低温下纳米Al_(2)O_(3)对硅酸盐-硫铝酸盐复合水泥浆性能和水化过程的影响;以普通硅酸盐水泥与硫铝酸盐水泥复合产生的水化协同效应为基础,结合纳米Al_(2)O_(3)、防冻剂EG、减水剂JS-1和早强剂TEOA,配制了纳米复合水泥浆NAC;采用扫描电镜、X射线衍射和水化放热试验相结合的方法,研究了NAC的低温水化过程及水化机理。试验得知,温度为-9℃时,纳米复合水泥浆具有良好的初始流动性,可泵期为57 min,初、终凝时间分别为84和101 min,24 h抗压强度为6.9 MPa。研究结果表明,NAC具有直角稠化效应,低温下性能优越,能够满足钻进低温地层时的护壁堵漏要求。In order to solve the problems of borehole wall collapse and well leakage in low-temperature drilling,a nano-composite cement slurry system suitable for low-temperature formations was designed.Combining the macroscopic test with microscopic analysis,the influence of nano-Al_(2)O_(3)at low temperatures on the performance of silicate-sulphoaluminate composite cement slurry and the hydration process was studied.Based on the synergistic effect of hydration generated from the composite of ordinary silicate cement and sulphoaluminate cement,a nano-composite cement(NAC)was developed in conjunction with the nano-Al_(2)O_(3),antifreeze agent EG,water reducing agent JS-1,and hardening accelerating agent TEOA.In addition,the low-temperature hydration process of NAC and its mechanism were studied through a combination of the scanning electron microscope(SEM),X-ray diffraction(XRD),and exothermic experiments of hydration.Experimental results showed that the nano-composite cement slurry had good initial fluidity at−9℃with a pumpable period of 57 min,a 24-hour compressive strength of 6.9 MPa,and an initial and final setting time of 84 min and 101 min,respectively.The results of the study indicated that NAC had the right-angle thickening effect and superior performance at low temperatures,capable of meeting the requirements of borehole wall protection and loss circulation control in low-temperature formations.

关 键 词：低温 地层 堵漏 水化 协同效应 纳米复合水泥浆 水化机理 

分 类 号：TE256.1[石油与天然气工程—油气井工程]