摘要：Oil-based drilling fluids are widely used in challenging wells such as those with large displacements, deepwater and ultra-deepwater wells, deep wells, and ultra-deep wells due to their excellent temperature resistance, inhibition properties, and lubrication. However, there is a challenging issue of rheological deterioration of drilling fluids under high-temperature conditions. In this study, a dual-amphiphilic segmented high-temperature-resistant gelling agent (HTR-GA) was synthesized using poly fatty acids and polyether amines as raw materials. Experimental results showed that the initial decomposition temperature of HTR-GA was 374 degrees C, indicating good thermal stability. After adding HTR-GA, the emulsion coalescence voltage increased for emulsions with different oil-to-water ratios. HTR-GA could construct a weak gel structure in oil-based drilling fluids, significantly enhancing the shear-thinning and thixotropic properties of oil-based drilling fluids under high-temperature conditions. Using HTR-GA as the core, a set of oil-based drilling fluid systems with good rheological properties, a density of 2.2 g/cm3, and temperature resistance up to 220 degrees C were constructed. After aging for 24 h at 220 degrees C, the dynamic shear force exceeded 10 Pa, and G ' exceeded 7 Pa, while after aging for 96 h at 220 degrees C, the dynamic shear force exceeded 4 Pa, and G '' reached 7 Pa. The synthesized compound HTR-GA has been empirically validated to significantly augment the rheological properties of oil-based drilling fluids, particularly under high-temperature conditions, showcasing impressive thermal stability with a resistance threshold of up to 220 degrees C. This notable enhancement provides critical technical reinforcement for progressive exploration endeavors in deep and ultra-deep well formations, specifically employing oil-based drilling fluids.

关键字：gelling agent; oil-based drilling fluid; weak gel; high-temperature resistance

ISSN号：1

卷、期、页：卷: 9期: 12

发表日期：2023-12-01

影响因子：0.000000

期刊分区（SCI为中科院分区）：三区

收录情况：SCI（科学引文索引印刷版）,ESCI（新兴资源引文索引）,SCIE（科学引文索引网络版）

发表期刊名称：GELS

参与作者：Guo, Lei,Zhang, Peng,Bai, Yunhai

通讯作者：杜明亮,何静,吕艳华

第一作者：贺垠博,刘海洋

论文类型：期刊论文

论文概要：贺垠博,杜明亮,何静,刘海洋,吕艳华,Guo, Lei,Zhang, Peng,Bai, Yunhai，An Amphiphilic Multiblock Polymer as a High-Temperature Gelling Agent for Oil-Based Drilling Fluids and Its Mechanism of Action，GELS，2023，卷: 9期: 12

论文题目：An Amphiphilic Multiblock Polymer as a High-Temperature Gelling Agent for Oil-Based Drilling Fluids and Its Mechanism of Action