小口径深孔钻探冲洗液循环阻力测算

Calculation of Circulation Resistance for Drilling Deep Hole of Slim Diameter

摘要:

小口径深孔钻进是目前地矿勘探主要的钻探方式。但由于其本身具有的特点，憋泵在工程实际中普遍遇到，如何科学地计算小口径深孔的循环阻力，提高循环减阻能力是亟待解决的技术难题。从钻探实际问题出发，通过建立流体力学模型，理论推导了钻杆内部和环空间的循环阻力计算公式，依托具体工程实例分析并提出了提高循环减阻能力的技术措施和对策。

Abstract:

Drilling deep hole of slim diameter is the main method in geological and mineral exploration, but pump suffocation is often encountered in engineering practice. It is a technical difficulty to improve the ability of reducing circulation resistance by scientifically calculation. By the establishment of hydrodynamic model, calculation formulas of circulation resistance in annulus and drill strings were theoretically derived. With the engineering practice, the paper analyzed and put forward the technical measures of improving the ability of circulation resistance reduction.