青藏高原复杂地层地质钻探低固相冲洗液试验研究

青藏高原由于地质条件的多样性,分布有松散破碎地层、高应力地层、断层破碎带等复杂地层,在地质钻探中经常遇到塌孔、漏浆、缩径、卡钻、埋钻等问题。同时配套使用的冲洗液形成的泥皮质量差、胶结能力较差、携岩粉能力较弱等不足。冲洗液的性能是实现复杂地层顺利钻进的关键。结合青藏高原复杂地层的地质特点,研发了低固相聚合物新型冲洗液,该冲洗液以钠质膨润土和微泡剂等外加剂为基础,具有流动性好、胶结性强、降失水量适中的特点,适宜在青藏高原复杂地层地质钻探中使用。

Experimental study on low solid flushing fluid for geological drilling in complex metamorphic of Qinghai?Tibetan Plateau

Due to the diversity of geological conditions,distributed in complex formation such as loose and broken formation,high stress formation,faults broken zone in the Qinghai?Tibet Plateau.In geological drilling,we often suffer problems such as hole collapse,slurry leakage,diameter reduction,stuck drill,buried drill,etc.At the same time,the mud cake formed by the mud is thin,the cementing ability is poor,and the rock carrying ability is weak.Therefore,flushing fluid is the key to achieve drilling smoothly in complex formation.Combining the geological characteristics of the complex formation of the Qinghai?Tibet Plateau,developed a new flushing fluid for low solid phase polymers.The flushing fluid based on sodium bentonite and additives such as micro foaming agent,etc.It has the characteristics of good fluidity,strong cementation,and moderate water loss,suitable for use in geological drilling of complex formation in the Qinghai?Tibet Plateau.