Synthesis and Application of Pyrrolidone-containing Shale Inhibitors

2017 International Symposium on Application of Materials Science and Energy Materials

材料科学;能源学

Liu, Yonggui^1,2 ; Hou, Jie^2 ; Zhang, Yang^2 ; Yan, Jing^2 ; Song, Tao^2 ; Xu, Yongjun^1

Harbin Institute of Technology, Harbin, Heilongjiang, China^1

Drilling Engineering Technology Research Institute, Daqing Oilfield Drilling Engineering Company, Daqing, Heilongjiang, China^2

关键词: Amino-terminated;    Daqing oilfields;    Diameter expansions;    Good compatibility;    Horizontal section;    N-vinyl-2-pyrrolidone;    Reservoir protection;    Three-step synthesis;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/322/2/022023/pdf
DOI  :  10.1088/1757-899X/322/2/022023

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

New generation polyamine inhibitors are amino-terminated polyethers with excellent inhibiting capabilities; they play a key role in borehole stabilization and reservoir protection. However, polyamine inhibitors are limited by their poor thermal stability, which can be attributed to the presence of ether bonds in their molecular structures. We propose a three-step synthesis approach fora novel pyrrolidone-containing polyamine inhibitor (DYNP) by introducing N-vinyl-2-pyrrolidone (NVP) on divinyloxyethane. This polyamine inhibitor exhibits an optimized molecular structure and has enhanced heat resistance. Characterizations by infrared (IR) spectroscopy and evaluation tests demonstrate several advantages of DYNP inhibitors, including excellent inhibiting capability (superior to similar materials such as polyamines), improved heat resistance (reasonable stability at temperatures up to 240°C), and good compatibility with both fresh water and salt water drilling fluids. These can be attributed to the presence of considerable amounts of amino groups in the repeating unit of DYNP molecules. The DYNP inhibitor was applied in over 20 boreholes in tight oil blocks in Daqing Oilfield to relieve hydration of formations with high shale contents. For instance, drilling in the 2033.5m horizontal section of Dragon 2 borehole was smooth, with a borehole diameter expansion ratio below 10%.