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Terpolymer with rigid side chain as filtrate reducer for water‐based drilling fluids
Author(s) -
Li Pengpeng,
Xu Yang,
Liu Ying,
Feng Jie,
Hui Baotong,
Feng Yakai,
Hu Miaomiao,
Guo Jintang
Publication year - 2021
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.50237
Subject(s) - drilling fluid , copolymer , itaconic acid , rheology , materials science , fourier transform infrared spectroscopy , reducer , side chain , chemical engineering , filtration (mathematics) , polymer chemistry , chemistry , drilling , composite material , polymer , statistics , mathematics , engineering , metallurgy , civil engineering
Synthetic copolymers as filtrate reducers for water‐based drilling fluids (WBDFs) are difficult to meet the needs of drilling engineering only by changing the type and proportion of functional groups of copolymers, especially under ultra‐high temperature and high salinity. In this study, an anionic terpolymer (named PSDI) with rigid side chain was synthesized using sodium p‐styrenesulfonate, N, N‐Dimethylacrylamide, and itaconic acid by free‐radical copolymerization. The chemical structure of PSDI was characterized by Fourier transform infrared spectroscopy and 1 H‐NMR spectrum. The high‐temperature/high‐pressure filtration loss (FL HTHP ) and the American Petroleum Institute filtration loss (FL API ) of the WBDFs containing 1.5 wt/vol% PSDI were 35.0 and 17.0 ml after thermal rolling at 240°C for 16 h, respectively. The FL HTHP and FL API of the WBDFs containing saturated NaCl were with control of 60.0 and 12.0 ml. The FL API of WBDFs containing 1.5 wt/vol% CaCl 2 reduced to 6.0 ml. Results indicate that the addition of PSDI can improve the anti‐high‐temperature performance and resistance to salt and calcium contamination of WBDFs. Results of rheological tests through fitting four rheological models suggest that rheological parameters can be improved as a result of forming the spatial network structure between the PSDI and bentonite flakes.