对完善和发展复合钻井液钻井技术的思考与认识

THINKING AND UNDERSTANDING OF PERFECTING AND DEVELOPING COMPOUND FIUID DRILLING TECHNIQUE

复合钻井液钻井技术是一项对付恶性漏失的实用技术,但因在运用中有较多的制约条件而未能得到广泛的使用。通过对复合钻井液钻井技术进行改进和完善,能够进一步拓展该技术的运用范围,发挥其技术潜力,对复杂漏失层的高效低成本钻井有重要意义。文章通过国内外相关文献的分析研究,结合作者的堵漏施工经验,着重论述了复合钻井液钻井技术运用的优势与制约因素,提出改进和完善此项技术的重点是通过环空压井液体系的优化提高压井液对井壁的稳定保护性能和防气窜能力;优化工艺参数、建立相关的配套工艺技术和现场监测手段。现场施工实践表明,通过对复合钻井液钻井技术的改进和完善,完全能够增强复合钻井液钻井技术对各种复杂地层的适应性,确保在现场实施过程中的井下和井控安全;特别是对于井喷与恶性井漏同时并存的复杂井,实施复合钻井液钻井技术能够得到更可靠的井控安全保障。文章对如何完善和发展复合钻井液技术提出了具体的技术思路和方法,对今后更好地使用和完善复合钻井液钻井技术有指导意义。

It is very important for high efficiency low-cost drilling of the complicated lost-circulation zone to improve and perfect the compound fluid drilling technique to open up its application scope and give full play to its technical potential. In the paper, through analyzing the domestic and foreign relevant literatures, the advantages and constraint factors of applying the compound fluid drilling technique are emphatically expounded in combination with the authors' loss-circulation-control-operating experiences. The key points of improving and perfecting the technique include: to raise the influence of well control fluid on both borehole wall stability and anti-gas channeling ability through optimizing the annular well control fluid system;and to optimize the technological parameters and to set up the related auxiliary technology and the on-site monitoring measures. The field operating results indicated that, through improving the compound fluid drilling technique, it could be well used for various complicated strata to ensure the downhole and well-control safety in the process of operating on the spot;and, especially for the complicated well of the coexistence of well blowout and vicious lost-circulation, its well control safety could be guaraneed more reliably by use of such a technique. The technical idea and method mentioned in the paper are of guide significance for well utilizing and perfecting the compound fluid drilling technique.