| 摘要 |
A modular cutting-teeth bit having controllable specific pressure for drilling includes: a module (1), a modular unit (2), a bit body (3), conventional cutting teeth (4) and a nozzle (5). According to mechanical performance of the rocks in the strata drilled and requirements of drilling well, a combination of shapes, sizes and numbers of the module and the modular unit is optimized; effective abrasion edge length of the cutting unit on a certain portion of the bit is controlled; and a constant specific pressure of the cutting unit of the bit during the drilling process is maintained. |
| 主权项 |
1. A modular cutting-teeth bit having controllable specific pressure for drilling, comprising: a module and a modular unit, wherein modular cutting teeth of said modular cutting-teeth bit having controllable specific pressure for drilling comprise said module for serving as matrix and said modular unit, a number of said module provided on said modular cutting-teeth bit is not less than 1, and a number of said modular unit provided on said module is not less than 2;
wherein types thereof are selected from the group consisting of a PDC bit, a diamond bit, an impregnated bit, a roller bit, a cone-cutting bit and a compact bit comprising at least two number selected from the group consisting of said PDC bit, said impregnated bit, said roller bit and said cone-cutting bit, wherein a material of a bit body thereof is selected from the group consisting of a sintered body of tungsten carbide and alloy, steel, cemented carbide and metal matrix composite; a number of the modular unit is 2, cross-section shapes of the module and the module unit are circles, a diameter of the module is d, two kinds of modular units are provided, a total number of two modular units are provided, which are respectively a first modular unit and a second modular unit, diameters of the first modular unit and the second modular unit are respectively d1, and d2, a center distance along a Y axis direction of the first modular unit to the second modular unit is h1, wherein0≤h1≤d1+d22. |
