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NaCl和CaCl_2溶液的羟乙基纤维素(HEC)在评价温度下会析出,从而对地层造成危害。Daniel P,Vollmer等人对HEC在甲酸盐中和高含锌盐溶液中的溶解性进行了研究。实验结果表明:①HEC只有在远小于甲酸盐饱和密度时才具有增粘作用;HEC的稳定性随温度的升高而降低,并从溶液中析出;冷却析出溶液至室温,搅拌,HEC再次溶解,起到增粘作用;②在含有特定量的高密度锌盐水溶液中,温度升高,HEC增
Hydroxyethyl cellulose (HEC) in NaCl and CaCl 2 solutions will precipitate at the evaluation temperature, which will cause harm to the formation. Daniel P, Vollmer et al. Studied the solubility of HEC in formate and in high-zinc salts. The experimental results show that: (1) HEC only has thickening effect only when it is much lower than the formate saturation density; the stability of HEC decreases with the increase of temperature and precipitates from the solution; the solution is cooled to room temperature and stirred, and the HEC dissolves again , Play a role in viscosifying; ② In a certain amount of high-density zinc salt solution, the temperature increased, HEC increased