Abstract: A matrix drill bit and method of manufacturing a matrix bit having back raked cutting elements is disclosed. In one aspect, a matrix drill bit for well drilling includes a matrix bit body that has a front area in a direction of drilling and two or more diamond impregnated cutting blades protruding from the front area of the matrix bit body. The cutting blades each have a front external surface protruding from the front area of the matrix bit body and present a plurality of back raked downhole interface surfaces in the direction of drilling. The downhole interface surfaces span a leading face and a trailing face where the leading face extends to a first height and the trailing face extends to a second height and the first height is greater than the second height.

Abstract: The present invention consists of an integrated monitoring and multichannel communication system for the management of rescue teams, especially those fighting forest fires, comprising a suit (1), worn by all operational suited units in the terrain; and electronic system (2); a telecommunication system (4) and an information system (3). The suit integrates fireproof, waterproof, heatproof and impact resistant materials, which as a unit integrate, protect and ease access to the electronic system. The electronic system (2) collects biometric and location data from the operational suited units in the terrain, transmitting said data to a panel located in the back of the suit. The telecommunications system (4) sends the biometric, orientation and location data, in real-time through an Ultra High Frequency network, to a computer integrated into a support vehicle, which in its turn sends the data, via terrestrial or satellite communications, to a server.

Abstract: The invention concerns a drill bit (1) with stationary cutting structure, comprising a tool body (2) and several blades (3), which consist of a metal matrix impregnated with abrasive particles, and which are fixed to the tool body while extending forward therefrom, said blades (3) forming jointly a front cutting surface (7), and having radial channels (4) for drilling fluid which mutually separate the blades (3) and are open outwards. The invention is characterized in that it further comprises, through at least one radial fluid channel (2) arranged between two said blades (3), at least one bridge (6, 6?, 6?) which connects said two blades, by being arranged between the tool body (2) and said front cutting surface (7).

Abstract: The invention concerns a drill bit (1) with stationary cutting structure, comprising a tool body (2) and several blades (3), which consist of a metal matrix impregnated with abrasive particles, and which are fixed to the tool body while extending forward therefrom, said blades (3) forming jointly a front cutting surface (7), and having radial channels (4) for drilling fluid which mutually separate the blades (3) and are open outwards. The invention is characterized in that it further comprises, through at least one radial fluid channel (2) arranged between two said blades (3), at least one bridge (6, 6?, 6?) which connects said two blades, by being arranged between the tool body (2) and said front cutting surface (7).

Abstract: A matrix drill bit and method of manufacturing a matrix bit having back raked cutting elements is disclosed. In one aspect, a matrix drill bit for well drilling includes a matrix bit body that has a front area in a direction of drilling and two or more diamond impregnated cutting blades protruding from the front area of the matrix bit body. The cutting blades each have a front external surface protruding from the front area of the matrix bit body and present a plurality of back raked downhole interface surfaces in the direction of drilling. The downhole interface surfaces span a leading face and a trailing face where the leading face extends to a first height and the trailing face extends to a second height and the first height is greater than the second height.