Abstract: The present invention provides non-planar cutting tooth and a diamond drill bit. The non-planar cutting tooth and the diamond drill bit have great ability of impact resistance and balling resistance. According to the features of drilled formation, cutting teeth are arranged on the drill bit with different mode, which can improve the mechanical speed and footage of the drill bit.

Abstract: The present invention provides non-planar cutting tooth and a diamond drill bit. The non-planar cutting tooth and the diamond drill bit have great ability of impact resistance and balling resistance. According to the features of drilled formation, cutting teeth are arranged on the drill bit with different mode, which can improve the mechanical speed and footage of the drill bit.

Abstract: The present invention provides a convex ridge type non-planar cutting tooth and a diamond drill bit, the convex ridge type non-planar cutting tooth comprises a cylindrical body, the surface of the end portion of the cylindrical body is provided with a main cutting convex ridge and two non-cutting convex ridges, the inner end of the main cutting convex ridge and the inner ends of the two non-cutting convex ridges converge at the surface of the end portion of the cylindrical body, the outer end of the main cutting convex ridge and the outer ends of the two non-cutting convex ridges extend to the outer edge of the surface of the end portion of the cylindrical body, the surfaces of the end portion of the cylindrical body on both sides of the main cutting convex ridge are cutting bevels. The convex ridge type non-planar cutting tooth and the diamond drill bit have great ability of impact resistance and balling resistance.

Abstract: A multi-sectional swellable packer for a wellbore has a mandrel and multiple packer elements mounted on the mandrel. The packer elements are formed of swellable materials that swell when contacted with a swelling fluid. In various embodiments, the outer diameter of the central element is larger than that of the end elements with or without gap between elements. In other embodiments, a multi-sectional swellable packer for a wellbore has multiple mandrels with multiple packer elements which are interconnected by flexible joints/connections. The outer diameter of the central element can be different from that of the end elements. The swellable rubber of the central element can be different from that of the end elements. The packer increases flexibility of operation and reduces the risk of run-in-hole.

Abstract: The present invention provides a convex ridge type non-planar cutting tooth and a diamond drill bit, the convex ridge type non-planar cutting tooth comprises a cylindrical body, the surface of the end portion of the cylindrical body is provided with a main cutting convex ridge and two non-cutting convex ridges, the inner end of the main cutting convex ridge and the inner ends of the two non-cutting convex ridges converge at the surface of the end portion of the cylindrical body, the outer end of the main cutting convex ridge and the outer ends of the two non-cutting convex ridges extend to the outer edge of the surface of the end portion of the cylindrical body, the surfaces of the end portion of the cylindrical body on both sides of the main cutting convex ridge are cutting bevels. The convex ridge type non-planar cutting tooth and the diamond drill bit have great ability of impact resistance and balling resistance.