基于地质聚合物原理实现泥饼固化的固井质量改善方法  

A Solution to the Improvement of the Quality of Cement Sheath-formation Bonding Based on Geopolymer Theory

作　　者：步玉环[1] 赵乐天 王春雨[1] BU Yuhuan ZHAO Letian WANG Chunyu(College of Petroleum Engineering, China University of Petroleum, Qingdao, Shandong 26658)

机构地区：[1]中国石油大学(华东)石油工程学院,山东青岛266580

出　　处：《钻井液与完井液》2017年第1期96-100,共5页Drilling Fluid & Completion Fluid

基　　金：国家重点基础研究发展规划"973"项目(2015CB251202)

摘　　要：钻井液在井壁上形成的一层不可固化的泥饼是固井二界面质量出现问题的主要因素,而泥饼固化技术是解决固井二界面问题的新思路。笔者结合矿渣固化泥饼技术和MTA固井技术的优势,提出了基于地质聚合物原理实现泥饼固化的新思。实验研究结果表明,在钻井液中加入偏高岭土和超细矿渣2种潜活性材料,当膨润土、偏高岭土和超细矿渣的比例为3︰3︰1时,钻井液形成的泥饼在激活剂的作用下能够具有较高强度;激活参数优化结果表明,激活剂硅酸钠的最佳加量为偏高岭土加量的72%,用于激活矿渣的氢氧化钠最佳加量为偏高岭土加量的2%,最优激活时间为15 min。此外,研究了偏高岭土和超细矿渣与钻井液的配伍性,发现2种材料对钻井液性能影响较小。通过泥饼固化实验结果显示,钻井液基浆的泥饼强度提高了63倍,2种钻井液体系的泥饼强度分别提高了16倍和20倍,表明该技术具有广阔的研究前景。Mud cakes left over on the borehole wall by drilling fluid play a major role in determining the quality of the bonding between cement sheath and formation. Solidification of mud cakes provides a new clue for solving the bonding problem. A new idea of mud cake solidification based on the geopolymer principle is presented in this paper. In this idea, the advantages of mud cake solidification by slag and the advantages of MTA well cementing technology were combined to provide a solution to the improvement of the quality of cement sheath-formation bonding. In laboratory studies, metakaolin and ultra-fine slag, as two potentially active materials, were added to a drilling fluid. Ata ratio of bentonite, metakaolin and ultra-fine slag of 3 ： 3 ： 1, the mud cake formed had higher strength under the action of activator. Optimization of activation parameters showed that, the amount of sodium silicate, the optimum activator, should be 72% of the amount of metakaolin, and the amount of sodium hydroxide （NaOH） used for the activation of slag should be 2% of that of metakaolin. The optimum activating time was 15 min. It was found that the metakaolin and the slag had only slight effect on the properties of the drilling fluid tested. The strength of the mud cake of the base mud was increased by 63 times after solidification, and the strengths of the mud cakes of two drilling fluid formulated were increased by 16 times and 20 times, respectively, indicating that this technology is worth extensive studying.

关 键 词：固井二界面 偏高岭土 膨润土 钻井液 泥饼固化 

分 类 号：TE256[石油与天然气工程—油气井工程]