Abstract

The increase in the demand for oil and gas in various countries will lead to an increase in the number of oil and gas drilling and the production of waste drilling fluid in the petroleum industry. However, the environmental protection requirements for the discharge of waste drilling fluid in various countries have not decreased, but have become more stringent. Therefore, it is very important to effectively treat the waste drilling fluid in a harmless manner and ensure that it meets the requirements of various countries for the discharge of waste drilling fluid. This article first analyzed the effects of three additives, polyacrylamide (PAM), polyaluminum chloride (PAC) and ferric oxide (FeSO₄) on reducing the chemical oxygen demand of waste drilling fluids in Chad, and determined the best of the three additives Dosage. Subsequently, the article further explores the effect of the optimal dosage of the three additives on the treatment of COD of waste drilling fluid in Chad. The results show that when the dosages of the three additives are 50, 8000 and 800 μg/g, flocculation and the removal efficiency of COD are the best, and the removal rate of COD is 72%. The effects of H₂O₂, Fe²⁺, pH value, reaction time and irradiation time on COD removal rate were further inspected. The COD removal rate of the filtrate after flocculation was further determined by the addition of 7.0% H₂O₂, 0.07% ferrous sulfate, pH 3.5 and reaction time 1.0 h. The optimal dosage of the three reagents used in laboratory experiments and the best conditions for the treatment of waste drilling fluid were applied to the Chad site to treat the waste drilling fluid, so that the liquid and solid phases of the treated waste drilling fluid can meet the domestic emission standards of Chad. The solid phase can be used for landfills, roads, at the same time as a fertile soil for plant growth. The liquid phase was used by the apparatus itself for recycling.

中文翻译：

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废钻井液中COD去除的研究及其在乍得油田的应用

摘要

各国对石油和天然气的需求增加将导致石油工业中石油和天然气钻井数量的增加以及废钻井液的生产增加。然而，各国对排放废钻井液的环境保护要求并未降低，但变得更加严格。因此，以无害的方式有效处理废钻井液并确保其满足各国排放废钻井液的要求非常重要。本文首先分析了三种添加剂聚丙烯酰胺（PAM），聚氯化铝（PAC）和三氧化二铁（FeSO ₄），以减少乍得废钻井液的化学需氧量，并确定三种添加剂的最佳用量。随后，文章进一步探讨了三种添加剂的最佳剂量对乍得废钻井液化学需氧量的处理效果。结果表明，三种添加剂的添加量分别为50、8000和800μg/ g时，絮凝度和COD的去除效率最佳，COD的去除率为72％。进一步考察了H ₂ O ₂，Fe ₂ ⁺，pH值，反应时间和辐照时间对COD去除率的影响。通过添加7.0％H ₂ O ₂进一步确定絮凝后滤液的COD去除率。，0.07％的硫酸亚铁，pH 3.5，反应时间1.0h。将用于实验室实验的三种试剂的最佳剂量和处理废钻井液的最佳条件应用于乍得站点，以处理废钻井液，从而使处理后的废钻井液的液相和固相都能满足要求。乍得的国内排放标准。固相可以用作填埋场，道路，同时也可以用作植物生长的肥沃土壤。液相被设备本身用于再循环。