摘要:
A cutting element includes a sleeve, a rotatable cutting element, and at least one retaining ring. The sleeve has a first inner diameter and a second inner diameter, wherein the second inner diameter is larger than the first inner diameter and located at a lower axial position than the first inner diameter. The rotatable cutting element has an axis of rotation extending therethrough, a cutting face, a body extending axially downward from the cutting face, wherein the body has a shaft that is disposed within the sleeve, and a circumferential groove formed around an outer surface of the shaft. The at least one retaining ring is disposed in the circumferential groove and extends at least around the entire circumference of the shaft, wherein the at least one retaining ring protrudes from the circumferential groove, thereby retaining the rotatable cutting element within the sleeve.
摘要:
A drill bit assembly that includes a shank including a shank axis, first and second ends, a drill bit seat at the second end and a central flow bore extending axially from the first end. Additionally, the assembly includes a sleeve disposed about and translatable axially relative to the shank and a drill bit rotatably coupled to the sleeve. The drill bit includes a first bit face having a first cutting structure configured to engage an earthen formation, and a second bit face having a second cutting structure configured to engage the earthen formation. The drill bit is configured to rotate about the about the shank axis in a cutting direction, and to rotate about an axis of rotation being orthogonal to the shank axis to selectively expose the first or second cutting surface to the earthen formation. The seat is configured to receive the first or second bit face.
摘要:
A formation-engaging assembly includes a formation-engaging structure holder with a side surface between a proximal end and a distal end, a receptacle in the distal end, and a lateral protrusion extending from a portion of the side surface of the formation-engaging structure holder adjacent the distal end. A formation-engaging structure may include a formation-engaging surface at a distal end, a proximal end and a sidewall therebetween. The proximal end and at least a portion of the sidewall of the formation-engaging structure may be received within the receptacle of the formation-engaging structure holder. Earth-boring tools may include such formation-engaging assemblies.
摘要:
A formation-engaging assembly includes a formation-engaging structure holder with a side surface between a proximal end and a distal end, a receptacle in the distal end, and a lateral protrusion extending from a portion of the side surface of the formation-engaging structure holder adjacent the distal end. A formation-engaging structure may include a formation-engaging surface at a distal end, a proximal end and a sidewall therebetween. The proximal end and at least a portion of the sidewall of the formation-engaging structure may be received within the receptacle of the formation-engaging structure holder. Earth-boring tools may include such formation-engaging assemblies.
摘要:
A downhole cutting tool may include a tool body; a plurality of blades extending azimuthally from the tool body; and a plurality of cutting elements disposed on the plurality of blades, the plurality of cutting elements comprising: at least two conical cutting elements comprising a substrate and a diamond layer having a conical cutting end, wherein at least one of the at least two conical cutting elements has a positive back rake angle, and at least one of the at least two conical cutting elements has a negative back rake angle.
摘要:
A drill bit for drilling a borehole in earth formations may include a bit body having a bit axis and a bit face; a plurality of blades extending radially along the bit face; and a plurality of cutting elements disposed on the plurality of blades. The plurality of cutting elements may include: at least one cutter including a substrate and a diamond table having a substantially planar cutting face; and at least two conical cutting elements including a substrate and a diamond layer having a conical cutting end. In a rotated view of the plurality of cutting elements into a single plane, the at least one cutter may be located a radial position from the bit axis that is intermediate the radial positions of the at least two conical cutting elements.
摘要:
A rotary drill bit is disclosed. The rotary drill bit may include a bit body, a cutting pocket defined in the bit body, and a cutting element rotatably coupled to the bit body. The cutting element may be positioned at least partially within the cutting pocket. The rotary drill bit may also include a rotation-inducing member adjacent to the cutting element for inducing rotation of the cutting element relative to the cutting pocket. The rotation-inducing member may include a resilient member or a vibrational member. The rotary drill bit may also include protrusions extending from an interior of the cutting pocket adjacent to an outer diameter of the cutting element. A method of drilling a formation is also disclosed.