钾铵基聚磺钻井液体系在大牛地气田水平井钻井中的应用

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

摘要:

大牛地气田水平井钻井中，由于A点前井眼尺寸较大，二叠系石千峰至下石盒子组泥岩普遍存在易水化膨胀、剥落、掉块、垮塌现象，处理复杂情况导致钻井周期长。经过2口水平井的钻井实践，摸索出了适合A点前的钾铵基聚磺钻井液体系，减少了井下复杂情况，提高了钻井效率，缩短了A点前的钻井周期，从而提高了该工区钻进水平井的综合效益。

关键词:水平井;“双保”天然高分子钻井液;钾铵基聚磺钻井液;大牛地气田

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.

Key words:horizontal well; natural polymer drilling fluid for both oil/gas reservoir protection; potassium-ammonium polysulfonate drilling fluid; Daniudi gas field