SUBSTANTIATION OF THE USE OF POLYMER-COMPOSITE MATERIALS, WHICH REDUCE THE INFLUENCE OF DYNAMIC FRICTION FORCES OF MACROSTRUCTURAL SURFACES, WHEN DRILLING WELLS

Abstract

The article justifies the need for technological solutions in the use of polymer-composite materials in order to limit the impact of dynamic frictional forces in oil drilling. The relationship between macrostructural surfaces was investigated, in particular increasing the effectiveness of the axial load on the drill bit during drilling directional and horizontal wells. It is established that the polymer coating of drill string elements (BC) based on fluoroplastic brand F-4, with a small thickness of 2 ? 3 mm and the appropriate application technology provides high physical and technical characteristics of this coating and under operating conditions has a low coefficient of wear on large functioning friction, which is about 4 ? 7.5 km. The surface of the drill string, covered with a polymer coating, in the trapped areas, with a low coefficient of friction (~ 0.025) is not capable of trapping. To reduce friction forces, the use of polymer-composite materials (PCM) to cover the surface of the elements of the drill string is proposed. Methods and mathematical models are given, due to which it is possible to obtain PCM with predetermined physical and mechanical properties that would meet the requirements of the operation of drill columns during drilling of inclined and horizontal wells. The obtained results of laboratory, analytical and industrial researches guarantee increase of efficiency of adjustment of axial loading on the rock-destroying instrument influencing mechanical speed of drilling.