Abstract
Cationic polymer fluid loss additive (CPFL) was prepared by using the reaction of 2,3-epoxypropyltrimethyl ammonium chloride (EPTMAC) (as cationic reagent) with the amide group in the molecular structure of the sodium salt of partially hydrolyzed polyacrylonitrile fibers (HPAN-Na). The chemical reaction was determined by studying the infrared absorption peaks of the materials and the products. The results proved that the cationic groups of EPTMAC were successfully grafted onto the HPAN molecular chain. The composition of the molecular chain of the product CPFL was determined by investigation and calculation of the elemental analysis results of the grafted HPAN and the final reaction product CPFL. The drilling fluid performance was evaluated, and the result showed that when the cation content was more than 0.27 mmol/g, the drilling fluid would have good resistance to fluid loss and to pollution from calcium chloride.
Highlights
In oil-drilling operations, a filtrate reducer is the most commonly used drilling fluid additive
Hydrolyzed sodium polyacrylonitrile with an anionic hydration group, polyacrylonitrile calcium salts, and polyacrylonitrile ammonium salts are widely used as filtrate reducers, which meet the requirements of well drilling operations below 120 °C (Cui and Zhu 1999; Ahmed et al 2013)
Hydrolysis products hydrolyzed polyacrylonitrile sodium salt (HPAN), and cationic product Cationic polymer fluid loss additive (CPFL) were tested by Fourier transform infrared spectroscopy
Summary
In oil-drilling operations, a filtrate reducer is the most commonly used drilling fluid additive. Its main functions are reducing drilling fluid filtration by forming thin and. The application of an allyl copolymer with cationic groups in the drilling fluid has been reported. This mainly revolves around its application to cationic and zwitterionic drilling fluid systems (Zhang and Deng 1998; Warren et al 2000). Modified polyacrylamide as a sealing agent has been used in water-based drilling fluid. There have been reports about acrylic waste fiber that can enable the drilling fluid loss agent to be cationically grafted under alkaline conditions (Yu et al 2004; Celik et al 2012). The application of the products and their mechanisms of activity in the drilling fluid should be further investigated
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