钻井泥浆样品现场高效液相色谱分析——冷冻与失水两种前处理方法的讨论

On-site HPLC Analysis of Drilling Mud—Discussion on Sample Pretreatment with Freeze and Filter Press Methods

对冷冻和失水两种前处理方法处理中国大陆科学钻探的钻井泥浆样品进行了探讨。实验结果表明,两种方法均可以得到符合高效液相色谱分析要求的、澄清的水溶液,但失水法可能会造成阳离子浓度的损失,用冷冻法进行前处理,阴、阳离子损失小,平行处理10个样品测定的相对标准偏差(RSD)小于5%,符合泥浆分析的要求。

Chinese continental scientific drilling program （CCSD） started in august 2001. HPLC technique has been adopted on-site to monitor the change of anion and cation concentrations in the drill mud in order to find out the occurrence of underground fluids. A major challenge to the HPLC analysis is the pretreatment of the drilling mud due to its complicated composition. Two methods, namely freeze and filter press pretreatment procedures, were tested to get representative liquids from the drilling mud. Experiments showed that both methods were suitable for anion analysis but only freeze pretreatment was suitable for cation analysis because filter press would cause loss of cations due to their adsorption on mud additives.