Experiments on two formulations for the treatment of abandoned mud in non-excavation directional drilling were carried out,the influence of different acids(hydrochloric acid and sulfuric acid)in the two formulations on key indicators such as dewatering rate,average filtrate COD,and average filtrate turbidity was investigated.The results indicated that formulation 1(hydrochloric acid+aluminum sulfate)exhibited a higher dewatering rate but had high filtrate COD values,which was possibly influenced by high chloride ion concentration.Conversely,formulation 2(sulfuric acid+aluminum sulfate)demonstrated superior performance in terms of average filtrate COD and turbidity,suggesting its more effective removal of suspended particles.In summary,formulation 2 had superior performance in solid-liquid separation and particle removal.
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