Wear-resistant and collision-resistant polycrystalline diamond compact (PDC) drill bit with rostriform teeth and plurality of blades

A novel wear-resistant and collision-resistant polycrystalline diamond compact (PDC) drill bit with rostriform teeth and a plurality of blades, comprising an upper joint (1), a drill matrix (2), primary blades (3), secondary blades (4), and short blades (5), wherein the upper joint (1) is connected to the drill matrix (2) through threads;

• the drill matrix (2) is of a nine-blade structure;
• the plurality of primary blades (3), secondary blades (4), and short blades (5) are uniformly distributed on the drill matrix (2);
• the plurality of primary blades (3), secondary blades (4), and short blades (5) are uniformly arranged at an interval of 40° in a circumferential direction on the drill matrix (2);
• a plurality of cutting tooth structures are arranged on the primary blades (3), secondary blades (4), and short blades (5);
• each of the primary blades (3) is of a linear structure, and the primary blade (3) is perpendicular to a normal plane of the drill matrix (2);
• each of the secondary blades (4) and short blades (5) is of a spiral structure;
• a chip space (6) is arranged between adjacent blades of the drill matrix (2);
• and the drill matrix (2) is internally provided with a drilling fluid flow channel (7) and water hole channels (8);
• the rostriform PDC primary teeth (14) of the nine-blade structure are placed in different circumferences, and the rostriform PDC primary teeth (14) among the primary blades (3), secondary blades (4), and short blades (5) are distributed in a staggered manner, so that the rostriform PDC primary teeth (14) in a second cutting area (17) are uniformly distributed, thereby increasing a utilization ratio of the rostriform PDC primary teeth (14) and improving the rock breaking efficiency of the drill bit;
• a first height difference is arranged between the teeth in front and back rows of the second cutting area (17), a second height difference is also arranged between the teeth in the same row, the first and the second height differences are 0.5-1 mm, and tine angles between the teeth placed in the front and back rows and the stratum are 8-10°;
• and a one-time penetration of the drill bit is reduced by arranging the first and the second height differences and tine angles to prevent the teeth from being disintegrated and falling off, so that the service life of the drill bit is prolonged;
• wherein the rostriform PDC primary tooth (14) comprises a PDC rostriform compact (101) and a sphero-cylindrical alloy base (102), the PDC rostriform compact (101) is of a cylindrical rostriform structure, and the sphero-cylindrical alloy base (102) is of a cylindrical semi-spherical structure;
• one end of the sphero-cylindrical alloy base (102) is provided with a stepped first surface (103), the PDC rostriform compact (101) is provided with a stepped second surface (104) contrary to the first surface (103), and the second surface (104) is matched with the first surface (103);
• and a stepped design partially increases the thickness of a cutting part of the PDC rostriform compact (101) to prevent brittle failure due to stress imbalance in a cutting process, so that the service life of the PDC rostriform compact (101) is prolonged;
• wherein the PDC rostriform compact (101) is further provided with a third surface (106) away from the second surface (104) and a fourth surface (105) at the lowest end;
• the third surface (106) and the fourth surface (105) are arranged in an intersecting manner;
• each of the third surface (106) and the fourth surface (105) is of a cone-shaped streamline structure, and the cone-shaped streamline structure is arranged to optimize a stress mode and a cutting area of the teeth during rock breaking;
• the third surface (106) is provided with a first curve (107), a second curve (108), a third curve (109), a first ridge line (110), a second ridge line (111), a cutting edge I (113), and a cutting edge II (115), and the fourth surface (105) is provided with a cutting edge III (118), a transition curve (119), tangent planes (120), a fourth curve (121), and a fifth curve (122).