Use of high HCl concentrations to dissolve Mn3O4-based filter cake will result in corrosive environment and release of poisonous chlorine gas (i.e., strong oxidizer). Thus, removal of deposits formed at the wellbore because of drilling fluids becomes more challenging when dealing with additives (e.g., Mn3O4) that involve complex interactions with the cleaning fluids, especially at high temperatures. We studied the reaction of HCl with Mn3O4 particles as a function of time. Additionally, we investigated the release of chlorine gas up to reaction temperature of 284°F and 15 wt% HCl. Several techniques and instruments were employed in this study. Solubility of filter cake was examined using a HPHT filter press. GC/MS technique was used for chlorine gas analysis, atomic absorption were used to measure manganese concentrations, and to analyze solids remained after reaction we used x-ray diffraction. Solubility of filter cake using 10 wt% HCl and temperature of 250°F was 78 wt% (no mixing during the reaction). At 190°F, high concentration of HCl (10 wt%) showed complete solubility of Mn3O4 particles while, 1 and 4 wt% HCl showed ~70 wt% solubility. Chlorine gas was not dissociated using 4 wt% HCl at 190°F. At 284°F, 5 wt% HCl was enough to release chlorine gas. Therefore, HCl concentrations lower than 5 wt% are recommended and will dissolve most of Mn3O4. The following reaction agrees with the experimental results of 1 and 4 wt% HCl at 190°F:
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机译：使用高HCl浓度溶解Mn3O4的滤饼将导致腐蚀性环境和释放有毒氯气（即，强氧化剂）。因此，在处理涉及与清洁流体的复杂相互作用的添加剂（例如，MN3O4）时，在钻井液中移除在井筒上形成的沉积物变得更具挑战性，特别是在高温下。我们将HCl与Mn3O4颗粒的反应作为时间的函数研究。另外，我们研究了氯气释放到284°F和15wt％HCl的反应温度。本研究采用了几种技术和仪器。使用HPHT过滤器检查滤饼的溶解度。 GC / MS技术用于氯气分析，使用原子吸收来测量锰浓度，并在反应后分析固体，我们使用X射线衍射。滤饼使用10wt％HCl的溶解度和250°F的温度为78wt％（反应过程中没有混合）。在190°F时，高浓度的HCl（10wt％）显示出Mn 3 O 4颗粒的完全溶解度，而1和4wt％HCl显示〜70wt％的溶解度。在190°F下不使用4wt％HCl解离氯气。在284°F中，5wt％HCl足以释放氯气。因此，建议使用低于5wt％的HCl浓度，并将溶解大部分Mn3O4。以下反应同意在190°F下的1和4wt％HCl的实验结果：
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