200℃加砂硅酸盐水泥配方优化设计及强度衰退机理  

Composition Optimization and Strength Decline Mechanism of Oil Well Cement Slurry at 200℃

作　　者：李宁 庞学玉 艾正青 秦建鲲 刘忠飞 王洪路 王银东 LI Ning;PANG Xueyu;AI Zhengqing;QIN Jiankun;LIU Zhongfei;WANG Honglu;WANG Yindong(Oil and Gas Engineering Research Institute,Petro China Tarim Oilfield Company,Korla 841000,Xinjiang,China;Key Laboratory of Unconventional Oil&Gas Development,China University of Petroleum(East China),Ministry of Education,Qingdao 266580,Shandong,China;School of Petroleum Engineering,China University of Petroleum(East China),Qingdao 266580,Shandong,China)

机构地区：[1]中石油塔里木油田分公司油气工程研究院,新疆库尔勒841000 [2]非常规油气开发教育部重点实验室,中国石油大学(华东),山东青岛266580 [3]中国石油大学(华东)石油工程学院,山东青岛266580

出　　处：《硅酸盐学报》2020年第11期1824-1833,共10页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金项目“油井水泥水化动力学实验研究及数值模拟”(51974352);中石油重大专项2018E-1808“超深进钻井提速提质关键技术研究与应用”;中石油塔里木油田“200℃超高温水泥石长期强度稳定研究与应用”。

摘　　要：通过研究200℃超高温环境下2种不同目数硅砂以及微硅等外掺料加量和配比对水泥石矿物成分及物理力学性能的影响,发现优化颗粒级配可以显著提高水泥石7 d抗压强度,同时提高SiO2总加量可以明显改善30 d长期强度。经过优化后的2套配方30d抗压强度达到40 MPa以上,水测渗透率低于2×10–6μm2。通过分析该两套配方物理力学性能在30 d内物理力学性能及微观结构成分随养护时间的演化规律,发现水泥石矿物成分及矿物结晶状态在7 d至30 d基本没有变化,但微观结构有粗化现象,从而导致其抗压强度、弹性模量等力学性能随时间降低,水测渗透率随时间近乎线性增长。The influence of adding crystalline silica and silica fume on the mineral composition and physical-mechanical properties of the set-cement was investigated. The results show that optimizing the particle size distribution of cement dry blend can improve the 7-d compressive strength. Increasing the total silica addition can enhance the 30-d compressive strength. At 30-d curing, two optimized systems have an average compressive strength of greater than 40 MPa and a water permeability of lower than 2×10–6 μm2. The physical, mechanical, mineral and microstructual property evolution of the two systems within 30 d were analyzed. It is indicated that there are little changes in the mineral compositions and their crystallinity during 7–30 d. However, apparent microstructure coarsening occurs, leading to the decline in compressive strength and modulus of elasticity as well as the almost linear increase in water permeability of the set cement as a function of time.

关 键 词：高温 高压 强度衰退 水测渗透率 气测渗透率 弹性模量 Poisson比 物相分析 

分 类 号：TU528[建筑科学—建筑技术科学]