第34卷第3期 2017年5月
钻井液与完并液
DRILLINGFLUID&COMPLETIONFLUID
doi: 10.3969/j.issn.1001-5620.2017.03.013
Vol.34 No.3 May2017
纳米级水化硅酸钙晶种作为油井水泥促凝剂的研究
王同友，符军放，赵琥
（中海油田服务股份有限公司油田化学事业部，河北燕郊065201）
王同友，特军放，赵琥.纳米级水化硅酸钙晶种作为油井水泥促凝剂的研究[].钻井液与完井液，2017，34（3）：68-71. WANG Tongyou, FU Junfang, ZHAO Hu. Study on nano calcium silicate hydrate used as oil well cement accelerator[J]. Drilling Fluid & Completion Fluid, 2017, 34 (3 ) : 68-71.
摘要纳米材料对水泥水化有促凝作用，近几年研究的重点为纳米级二氧化硅，但高的比表面积使其对水泥浆体增稠明显。水化硅酸钙晶种是采用人工合成的纳米级水化硅酸钙，其成核作用可以加速水泥的水化反应，因此，以四水硝酸钙和五水偏硅酸钠为原料，通过况淀反应制备水化硅酸钙晶种，并开展了晶种作为油并水泥促凝剂的研究。结果表明，在10 ℃下，采用Tamair微量热仪对水泥水化热和水化速率进行了96h不间断测试，随着晶种添加量的增加，水泥水化的诱导期星现明显缩短趋势，放热量星现增加趋势；用超声波强度分析仪实时跟踪水泥石强度的发展过程表明，加入晶种后起强度的时间明显缩短，水泥石强度发展速率得到了明墨提升，且随着晶种添加量的增加，趋势更加明显；雨水泥浆黏度并没有随着晶种添加量增加西呈现出明显的增加趋势。固此，水化硅酸钙晶种具有加速水泥水化反应、提高水泥石早期强度以及缩短静胶凝过渡时间的特点，是一种其有应用潜力的低温促凝剂。
促凝剂；固井；水化硅酸钙；晶种
关键词
中图分类号：TE256.6
文献标识码：A
文章编号：1001-5620（2017）03-0068-04
Study onNano Calcium SilicateHydrate Used as OilWell Cement Accelerator
WANGTongyou,FUJunfang,ZHAOHu
(Division ofOifieldChemistry,COSL,Yanjiao,Hebei065201)
Abstract Nano material is able to accelerate the hydration of cement. Nano silica has recently been widely studied for its use in well cementing. Nano silica accelerates the hydration ofcement excessively because ofits high specific surface area. Calcium silicate hydrate seed crystal, an artificially synthesized nano calcium silicate hydrate, can accelerate the hydration of cement through nucleation. Using Ca(NO,), · 4H,O and NasiO, · 5H,O as raw materials, a calcium silicate (C—SH) seed crystal was developed through precipitation reaction, and study on the use of C—S—H as oil well cement accelerator was conducted. The heat of hydration and hydration rate of cement were measured unintermitently at 10 C for 96 hours with Tam air isothermal calorimetry. It was found that with an increase in the concentration of the seed crystal, the induction time of cement hydration was notably shortened, and the amount of heat released was increasing. The developing progress of the strength of the set cement, measured with an ultrasonic strength analyzer in the study, indicated that the use of seed crystal notably shortened the time required for the cement slurry to develop strength, and the rate of strength development of the set cement increased obviously. The more the seed crystal used, the faster the development of the strength of set cement, It was also found that the addition of the seed crystal did not notably increase the viscosity of the cement slurry. From these studies it is understood that the C—S—H seed crystal is able to accelerate the hydration of cement, increase the early strength of
set cement and shorten the induction time for gel strength development, It is a potential low temperature accelerator Key words Accelerator; Well cementing; Calcium silicate hydrate; Seed crystal
对于表层井段固井，因封固地层温度低，水泥水化速度及水泥石强度发展均缓慢，常需使用促凝剂，
以提高水泥水化速度，改善低温下水泥石强度的发展状况。同时，促凝剂的使用，候凝时间缩短，对
第一作者简介：王同友，高级工程师，1994年毕业于中国石油大学（华东）,现在从事油田化学技术管理工作。电话（010）
84521995 ; E-mail : wangty6@cosl.com.cn 万方数据