Application of Potassium-ammonium Polysulfonate Drilling Fluid System in Horizontal Well of Danudi Gas Field

Abstract:

In drilling of Daniudi gas field, hydrating swelling, spalling, block-falling and collapsing were the common phenomenon in the mudstone of Permian Shiqianfeng formation to lower Shihezi formation, which led to long drilling period. Potassium-ammonium polysulfonate drilling fluid system was found out based on the drilling experience of 2 horizontal wells, with which drilling efficiency was improved.