钠、钙、锌的溴盐和氯盐盐水成功地用作清洁盐水完井液和封隔液已超过2 0年 ,对其化学性质与应用已进行了评价与报道。钠、钾、铯的甲酸盐盐水是相对较新的技术 ,正在探索将其用作清洁盐水完井液和封隔液。然而关于甲酸盐在油田应用中的化学性能 ,尤其是在高温和含CO2 的恶劣条件下的性能公布的信息相对较少。本文介绍了以前未曾报道过的应用于油田的甲酸盐盐水的化学性质。对pH值、缓冲能力、CO2 含量和温度对甲酸盐盐水可能造成的腐蚀性和分解作用进行了广泛研究与实验。从热稳定性与腐蚀性实验结果得出了辨别典型的井眼条件下甲酸盐离子的热分解条件 ,以及与油田管道发生明显腐蚀的条件。介绍了产生氢气、一氧化碳、结垢以及发生腐蚀的条件。这些研究结果有助于选择适用于井下条件下的甲酸盐溶液 Sodium, Calcium, Zinc Bromide and Chloride Salts have been successfully used as cleaning well completion fluids and packings for more than 20 years, and their chemical properties and applications have been evaluated and reported. Formate brine for sodium, potassium and cesium is relatively new technology and is being explored for its use as a cleaning brine completion and packing solution. However, there is relatively little published information on the chemical properties of formate in oilfield applications, especially at high temperatures and harsh conditions containing CO2. This paper presents the chemical properties of formate brines used in the oilfield that have not previously been reported. Extensive research and experiments have been conducted on the possible caustic and decomposition effects of formate brine on pH, buffer capacity, CO2 content and temperature. From the results of thermal stability and corrosivity experiments, the conditions for distinguishing the thermal decomposition of formate ion under typical wellbore conditions and the obvious corrosion with the oilfield pipelines were obtained. Describes the conditions for generating hydrogen, carbon monoxide, scaling, and corrosion. These findings help to select formate solutions suitable for downhole conditions