# US 2014/0151131 A1 · Hybrid Drill Bit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0151131 A1 - Document ID: US20140151131A1 - Status: Published application - Kind: A1 - Application number: 13/905,396 - Filed: 2013-05-30 - Published: 2014-06-05 - Earliest claimed: 2009-05-13 - Assignees: Baker Hughes Incorporated - Applicants: Baker Hughes Incorporated - Inventors: Anton F. Zahradnik; Ron D. McCormick; Rudolf C. Pessier; Jack T. Oldham; Michael S. Damschen; Don Q. Nguyen; Matt Meiners; Karlos B. Cepeda; Mark P. Blackman - Web page: https://patentgrep.com/patent/US20140151131A1 ## CPC - E21B 10/14: combined with non-rolling cutters other than of leading-portion type - E21B 10/00: Drill bits (specially adapted for deflecting the direction of boring {E21B7/064}; with means for collecting substances E21B27/00) - E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS ## Abstract A bit body is configured at its upper extent for connection into a drillstring. At least one fixed blade extends downwardly from the bit body, and has a radially outermost gage surface. A plurality of fixed cutting elements is secured to the fixed blade, preferably in a row at its rotationally leading edge. At least one bit leg is secured to the bit body and a rolling cutter is mounted for rotation on the bit leg. At least one stabilizer pad is disposed between the bit leg and the fixed blade, the stabilizer pad extending radially outward to substantially the gage surface. The radially outermost gage surface of each blade can extend axially downward parallel to the bit axis or angled (non-parallel), spirally or helically, relative to the bit axis. ## Claims ### Claim at position 1 1-33. (canceled) ### Claim 34 An earth-boring bit comprising: a bit body having a central longitudinal axis that defines an axial center of the bit body and configured at its upper extent for connection into a drill string; at least one bit leg secured to the bit body; a rolling cutter mounted for rotation on the bit leg; at least one fixed blade extending downwardly from the bit body, the fixed blade having a radially outermost gage surface that extends outward to substantially the full gage diameter of the bit; a plurality of fixed cutting elements secured to the fixed blade, wherein at least a portion of at least one of the plurality of fixed cutting elements is located at or near the axial center of the bit body; a rolling cutter mounted for rotation on the bit leg; and at least one stabilizer pad disposed between the at least one bit leg and the at least one fixed blade, the stabilizer pad extending radially outward to substantially the gage surface. ### Claim 35 (depends on 34) The earth-boring bit according to claim 34, further comprising a plurality of rolling-cutter cutting elements arranged on the rolling cutter. ### Claim 36 (depends on 34) The earth-boring bit according to claim 34, wherein the stabilizer pad is formed integrally with the fixed blade and extends toward the bit leg. ### Claim 37 (depends on 34) The earth-boring bit according to claim 34, wherein at least a portion of the fixed cutting elements are arranged in a row on a rotationally leading edge of the fixed blade. ### Claim 38 (depends on 34) The earth-boring bit according to claim 34, wherein the stabilizer pad, gage surface of each fixed blade, and a portion of the bit leg extending to the gage surface together describe a segment of the circumference of the borehole that equals or exceeds 180 degrees. ### Claim 39 (depends on 34) The earth-boring bit according to claim 34, further comprising: a plurality of fixed blades extending downwardly from the bit body; a plurality of bit legs extending downwardly from the bit body; and a stabilizer pad located discretely and separately between each bit leg and each fixed blade, wherein the plurality of bit legs are not directly opposite one another, and the plurality of fixed blades are not directly opposite one another. ### Claim 40 (depends on 34) The earth-boring bit according to claim 34, wherein each stabilizer pad has an equal area exposed to the sidewall of the borehole being drilled. ### Claim 41 An earth-boring bit comprising: a bit body configured at its upper extent for connection into a drillstring, the bit body having a central longitudinal axis; at least one fixed blade extending downwardly from the bit body, the fixed blade having a radially outermost gage surface, the gage surface of each fixed blade extending axially downward at an angle other than zero relative to the longitudinal axis of the bit body; a plurality of fixed cutting elements secured to each fixed blade, wherein at least a portion of at least one of the plurality of fixed cutting elements is located at or near the axial center of the bit body; at least one bit leg secured to the bit body; a rolling cutter mounted for rotation on the bit leg; and at least one rolling-cutter cutting element arranged on the rolling cutter, wherein the gage surface of the at least one fixed blade has a leading edge and a trailing edge, the gage surface of the at least one fixed blade acting as a stabilization pad, and wherein the at least one fixed blade operates as a stabilizer pad. ### Claim 42 (depends on 41) The earth-boring bit according to claim 41 wherein the gage at least one of the leading and trailing edge extends axially downward at an angle other than zero relative to the longitudinal axis of the bit body. ### Claim 43 (depends on 41) The earth-boring bit according to claim 41, further comprising: a plurality of fixed blades extending downwardly from the bit body at an angle other than zero relative to the longitudinal axis of the bit body, wherein the fixed blades are not directly opposite one another; and a plurality of bit legs extending downwardly from the bit body, a portion of each bit leg extending radially outward to substantially the gage surface, wherein the bit legs are not directly opposite one another. ### Claim 44 (depends on 42) The earth-boring bit according to claim 42, wherein the leading and trailing edges are linear. ### Claim 45 (depends on 42) The earth-boring bit according to claim 42, wherein the leading and trailing edges are curved and define a helix about the longitudinal axis. ### Claim 46 (depends on 41) The earth-boring bit according to claim 41, further comprising a stabilizer pad disposed between the at least one bit leg and the at least one fixed blade, the stabilizer pad extending radially outward to substantially the gage surface. ### Claim 47 (depends on 46) The earth-boring bit according to claim 46, wherein the stabilizer pad, gage surface of each fixed blade, and a portion of the bit leg extending to the gage surface together describe a segment of the circumference of the borehole that equals or exceeds 180 degrees. ### Claim 48 An earth-boring bit comprising: a bit body configured at its upper extent for connection into a drillstring, the bit body having a central longitudinal axis; at least one fixed blade extending downwardly from the bit body, the fixed blade having a radially outermost gage surface, the gage surface of each fixed blade extending axially downward and non-parallel to the longitudinal axis of the bit body; a plurality of fixed cutting elements secured to each fixed blade; at least one bit leg secured to the bit body; a rolling cutter mounted for rotation on the bit leg; and at least one rolling-cutter cutting element arranged on the rolling cutter, wherein the at least one fixed blade operates as a stabilizer pad. ### Claim 49 (depends on 48) The earth-boring bit according to claim 48, wherein the gage surface of the fixed blade has a leading edge and a trailing edge, and at least one of the leading and trailing edge extends axially downward non-parallel to the longitudinal axis of the bit body. ### Claim 50 (depends on 48) The earth-boring bit according to claim 48, further comprising: a plurality of fixed blades extending downwardly from the bit body non-parallel to the longitudinal axis of the bit body, wherein the fixed blades are not directly opposite one another; and a plurality of bit legs extending downwardly from the bit body, a portion of each bit leg extending radially outward to substantially the gage surface, wherein the bit legs are not directly opposite one another. ### Claim 51 (depends on 49) The earth-boring bit according to claim 49, wherein the leading and trailing edges are linear. ### Claim 52 (depends on 49) The earth-boring bit according to claim 49, wherein the leading and trailing edges are curved and define a helix about the longitudinal axis. ### Claim 53 (depends on 48) The earth-boring bit according to claim 48, further comprising a stabilizer pad disposed between the at least one bit leg and the at least one fixed blade, the stabilizer pad extending radially outward to substantially the gage surface. ### Claim 54 An earth-boring drill bit comprising: a bit body configured at its upper extent for connection into a drillstring; at least one fixed blade extending downwardly from the bit body, the fixed blade having a radially outermost gage surface; a plurality of fixed cutting elements secured to each fixed blade; at least one bit leg secured to the bit body; a rolling cutter mounted for rotation on the bit leg, the bit leg having a radially outermost surface, the radially outermost surface of the bit leg extending toward and joining the radially outermost surface of the fixed blade; and at least one rolling-cutter cutting element arranged on the rolling cutter wherein the joined radially outermost surfaces of the fixed blade and bit leg together describe a segment of the circumference of the borehole that equals or exceeds 180 degrees. ### Claim 55 (depends on 54) The earth-boring drill bit according to claim 54, further comprising a plurality of rolling-cutter cutting elements arranged on the rolling cutter. ### Claim 56 (depends on 54) The earth-boring drill bit according to claim 54, further comprising a plurality of fixed blades and a plurality of bit lets, the number of fixed blades being equal to the number of bit legs. ### Claim 57 (depends on 54) The earth-boring drill bit according to claim 54, wherein at least a portion of the fixed cutting elements are arranged in a row on a rotationally leading edge of the fixed blade.