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在金刚石钻进中,经常遇到严重漏失地层,传统的施工方法是先堵漏或在钻杆上涂抹润滑脂。针对这些方法费工费时及不安全等问题,我们采取不堵漏,向钻孔内倒入少量脂肪酸作润滑油的方法,在钻杆与孔壁界面形成一种有一定强度的边界膜,达到润滑减阻的目的。机械行业把边界膜分为两类:一类是适用一般温度、速度、载荷的物理或化学吸附膜;另一类是适用重载、高温、高速的反应膜。在金刚石钻进中钻杆与孔壁的摩擦接触属于轻载、中速、低温,只要求在两者表面形成物理吸附膜,就可达到钻杆的减阻目的。形成这种吸附膜的原料主要是脂肪酸。由于脂肪酸是极性分子,能在钻杆与孔壁表面定向排列,靠分子间
In diamond drilling, often encountered serious loss of strata, the traditional method of construction is the first plugging or grease drill pipe. In view of these methods, such as laborious and time-consuming and unsafe problems, we take not plugging, pouring a small amount of fatty acids into the borehole as a lubricant, the drill pipe and the hole wall interface to form a certain intensity of the boundary film, to Lubrication drag reduction purposes. The mechanical industry divides the boundary membrane into two types: one is a physical or chemical adsorption membrane that is suitable for general temperature, velocity and load; the other is a reaction membrane that is suitable for heavy-duty, high-temperature and high-speed applications. The frictional contact between the drill pipe and the hole wall during diamond drilling belongs to light load, medium speed and low temperature, and only requires the formation of a physical adsorption film on both surfaces to achieve the purpose of reducing the resistance of the drill pipe. The raw material for forming such adsorption film is mainly fatty acid. As fatty acid is a polar molecule, it can be aligned in the surface of the drill pipe and pore wall, by the intermolecular