新型水基防塌钻井液室内研究  

Research on Novel Anti-caving Drilling Fluid System

作　　者：李方[1] 余越琳[1] 蒲晓林[1] 刘鹭[1] 

机构地区：[1]西南石油大学石油工程学院

出　　处：《钻井液与完井液》2013年第3期1-3,91,共3页Drilling Fluid & Completion Fluid

基　　金：四川省教育厅重大培育项目"改变井壁岩石和泥饼亲水通道的钻完井液技术研究"(09ZZ037)

摘　　要：提出了一种新型水基钻井液防塌思路,即在水基钻井液中引入疏水成分,在正压差作用下,使其在井壁孔隙和泥饼中形成弱亲水或亲油通道,通过毛细管阻力阻止或减少滤液进入地层,从而解决井壁地层吸水而产生井壁不稳定的问题。采用自制的疏水降失水剂SDG和疏水封堵剂STG,并以此作为钻井液的主处理剂,构建出了新型水基防塌钻井液,并对其性能进行了评价。室内评价结果表明,构建的新型防塌钻井液抗温可达150℃,对钻屑容量可达5%,在150℃下抑制性优越,具有良好的沉降稳定性,且加入疏水处理剂后的钻井液也改善了对储层的损害程度。Anovel anti-caving method of water-based drilling fluid is proposed,which hydrophobic substance is introduced to form weak hydrophilic or hydrophobic capillary channel under pressure difference that can reduce filtrate entering formation,which can solve the problem of water absorption wellbore instability.Anovel water-based drilling fluid system is developed based on self-made hydrophobic filtrate reducer SDG and sealing agent STG,and the evaluation results show that it can be used up to 150℃,the tolerance of cuttings is 5%,the inhibition is good even at 150 ℃,and it can reduce the damage to reservoirs.

关 键 词：水基防塌钻井液 疏水处理剂 岩心流动实验 

分 类 号：TE254.3[石油与天然气工程—油气井工程]