油基钻井液混浆对水泥浆性能的影响

doi:10.3969/J. ISSN.1006-768X.2022.01.021

摘要/Abstract

摘要： 针对固井时油基钻井液与水泥浆混合发生接触污染，会造成混浆段流变性变差和抗压强度降低这一问题，文章对接触污染的机理进行了分析和讨论，比较了掺入油基钻井液前后的水泥浆性能，并利用环境扫描电镜、Ｘ-射线衍射仪、红外光谱和扫描电镜对比了掺入前后水泥浆的物相、水化过程和微结构。研究结果表明，接触污染的机理在于油包水乳化钻井液中的乳化剂在水泥浆中产生了渗透压现象和破乳作用，渗透压现象可造成水泥浆中的自由水通过半透膜迁移入钻井液中的盐水相中，导致水泥浆流变性能急剧恶化；破乳作用可造成乳化剂在混浆中的游离，游离乳化剂会包裹油相于水泥颗粒上导致水泥石产生蜂窝结构，强度严重下降。

关键词: 油基钻井液, 水泥浆, 接触污染, 渗透, 乳化

Abstract:

To solve the problems occurring during the displacement process lead to contamination of cement slurry with oil-based drilling fluids (OBM), mixing fluids subsequently created significant problems, such as deteriorating the rheological properties and the compressive strength, this paper has studied the mechanism of cement slurry contact with OBM, and compared the performance of cement slurry before and after mixed with OBM, used the freeze-drying/environmental scanning electron microscope (ESEM), X-ray diffraction (XRD), infrared spectroscopy (IR) and scanning electron microscope (SEM) to compare the phases, hydration process and microstructure of cement slurry before and after mixing OBM. The results showed that the effects of both osmotic pressure and demulsification decrease the free water of cement slurry and oil phase of OBM hinders the hydration process of cement slurry, which deteriorates the rheological properties and mechanical properties. The results also showed that the surfactant of alcohol ether sulfate used in these tests effectively relieved the OBM contamination. The mechanism is that the surfactant can damage the water-in-oil emulsification structure of mixing fluid to improve the rheological property and package the hydrocarbon liquid from the OBM to from the oil-in-water emulsification to improve the compressive strength in a limited way.

Key words: oil-based drilling fluids (OBM), cement slurry, contact contamination, penetration, emulsion

中图分类号:

李仲, 欧红娟, 陈思韵, 郑友志, 尹晟琦, 付洪琼, 李明. 油基钻井液混浆对水泥浆性能的影响[J]. 钻采工艺, 2022, 45(1): 122-127.

LI Zhong, OU Hongjuan, CHEN Siyun, ZHENG Youzhi, YIN Shengqi, FU Hongqiong, LI Ming. Influence of Oil-based Drilling Fluid on the Performance and Structure of Oil Well Cement[J]. Drilling & Production Technology, 2022, 45(1): 122-127.

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