金山地区防塌钻井液体系研究

金山地区是松辽盆地的主要油气聚集区。该区岩性复杂，泥岩发育，钻井过程中随着钻井液浸泡时间的延长，井壁稳定问题突出。通过对地层理化性质和力学稳定性分析，是由于钻井液的化学稳定性不足导致了井壁的失稳。为了提高钻井液的化学稳定性，提出了“封堵”防塌的技术方案。研制的防塌钻井液体系具有封堵和抑制性强等特点。该体系高温高压失水可以控制在11 mL/30 min以内，砂床侵入深度2 cm，泥页岩回收率达到95%以上，钻井液抑制和封堵效果显著。

Studies of Prevent Caving Drilling Mud in the Jinshan Tract

Jinshan is hydrocarbon accumulation area chiefly, which have complex lithology and mudstone development. With long soak time of drilling mud, problems of wall stability are projecting. Be based on layer physics and chemistry and mechanics stability analysis, scarce chemistry stability of drilling mud which cause wall instability. To heighten wall stability,Proposeing first opinion of plugging prevent caving.Prepareing prevent caving drilling mud. The system have sealing and restrain characteristics powerfully. High temperature and pressure filtration can attain eleven millilitre under. Sand bed intrude into two centimeter. Mud shale rate of recovery can attain ninetyfive percent above, effect of drilling mud prevent caving marked are remarkably.