Study on Application of Cutting Theory in Oil and Gas Engineering
DOI:
https://doi.org/10.9734/bpi/naer/v5/9741DKeywords:
Cutting, ultimate stress state, destruction of granular media with adhesion, envelope of Mohr's limit circles, working angles of cutting tools, friction and adhesive phenomena during cutting, cutting forces and powerAbstract
The article analyzes the problem of reducing the cutting force of soils when drilling wells, which is one of the main problems of increasing labor productivity and energy saving in mining and construction engineering. It is proposed to use the peculiarity of the soil to resist stretching weakly and, in this regard, to intensify tensile forces in the drilled rock. The scientific basis of the proposals is the classical Mohr theory of strength, the resulting theory of the limiting state of materials and, known from the theory of metal cutting and soil mechanics, contact phenomena in the cutting zone, leading to the appearance of tension in the compressed volume of the material. A methodology of determining the optimal geometry of the cutting blade as applied to drilling wells are given, which can significantly increase the drilling speed and reduce energy consumption. It is proposed to use the  peculiarity of the soil to weakly resist tensile forces, and in this regard, to intensify tensile stresses in the drilled rock.
