US Patent No: 6,321,862
Number of patents in Portfolio can not be more than 2000
Rotary drill bits for directional drilling employing tandem gage pad arrangement with cutting elements and up-drill capability
Stats
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Nov 27, 2001
Issued date -
Aug 5, 1998
filing date -
09/129,302
serial no -
Expired
status
Importance
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Abstract
A rotary drag bit suitable for directional drilling. The bit includes a bit body from which extend radially-oriented blades carrying PDC cutters. The blades extend to primary gage pads, above which secondary gage pads are either longitudinally spaced or rotationally spaced, or both, defining a gap or discontinuity between the primary and secondary gage pads through which drilling fluid from adjacent junk slots may communicate laterally or circumferentially. Longitudinally leading edges of the secondary gage pads carry cutters for smoothing the sidewall of the borehole. The cutters are preferably configured and oriented so as to provide a relatively aggressive cutting edge to the formation in both longitudinal and rotational directions of bit movement, the cutting edges lying adjacent cutting surfaces preferably disposed at negative rake angles to the formation material of the borehole wall for enhanced durability. Cutters may likewise be disposed on the trailing ends of the secondary gage pads to provide an up-drill capability to facilitate removal of the bit from the borehole. The tandem primary and secondary gage pads provide enhanced bit stability and reduced side cutting tendencies. The discontinuities between the primary and secondary gage pads enhance fluid flow from the bit face to the borehole annulus above the bit, promoting formation cuttings removal. The tandem gage arrangement also has utility in conventional bits not designed specifically for directional drilling.
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First Claim
Related Publications
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
|---|---|---|---|
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| 5,467,836 Fixed cutter bit with shear cutting gage | 58 | 1994 | |
| 5,655,612 Earth-boring bit with shear cutting gage | 48 | 1995 | |
| 5,957,223 Bi-center drill bit with enhanced stabilizing features | 101 | 1997 | |
| 6,006,845 Rotary drill bits for directional drilling employing tandem gage pad arrangement with reaming capability | 14 | 1997 | |
| 5,996,713 Rolling cutter bit with improved rotational stabilization | 24 | 1997 | |
| 6,000,483 Superabrasive cutting element with enhanced durability and increased wear life, and apparatus so equipped | 64 | 1998 | |
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| 4,714,120 Diamond drill bit with co-joined cutters | 15 | 1987 | |
| 4,941,538 One-piece drill bit with improved gage design | 15 | 1989 | |
| 5,558,170 Method and apparatus for improving drill bit stability | 63 | 1994 | |
| 5,547,033 Rotary cone drill bit and method for enhanced lifting of fluids and cuttings | 22 | 1994 | |
| 5,553,681 Rotary cone drill bit with angled ramps | 32 | 1994 | |
| 5,755,297 Rotary cone drill bit with integral stabilizers | 30 | 1996 | |
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| 4,429,755 Drill with polycrystalline diamond drill blanks for soft, medium-hard and hard formations | 30 | 1981 | |
| 4,545,441 Drill bits with polycrystalline diamond cutting elements mounted on serrated supports pressed in drill head | 46 | 1984 | |
| 4,602,691 Diamond drill bit with varied cutting elements | 49 | 1984 | |
| 5,033,559 Drill bit with faceted profile | 20 | 1990 | |
| 5,033,560 Drill bit with decreasing diameter cutters | 26 | 1990 | |
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| 4,512,425 Up-drill sub for use in rotary drilling | 13 | 1983 | |
| 4,515,227 Nozzle placement in a diamond rotating bit including a pilot bit | 32 | 1983 | |
| 4,673,044 Earth boring bit for soft to hard formations | 39 | 1985 | |
| 4,869,330 Apparatus for establishing hydraulic flow regime in drill bits | 26 | 1988 | |
| 5,004,057 Drill bit with improved steerability | 26 | 1989 | |
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| 4,221,270 Drag bit | 65 | 1978 | |
| 4,246,977 Diamond studded insert drag bit with strategically located hydraulic passages for mud motors | 34 | 1979 | |
| 5,415,243 Rock bit borhole back reaming method | 25 | 1994 | |
| 6,039,131 Directional drift and drill PDC drill bit | 92 | 1997 | |
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| 4,558,753 Drag bit and cutters | 46 | 1983 | |
| 4,640,375 Drill bit and cutter therefor | 22 | 1984 | |
| 4,676,324 Drill bit and cutter therefor | 21 | 1986 | |
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| 5,163,524 Rotary drill bits | 24 | 1991 | |
| 5,651,421 Rotary drill bits | 36 | 1995 | |
| 5,904,213 Rotary drill bits | 14 | 1997 | |
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| 5,601,151 Drilling tool | 16 | 1995 | |
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| 5,992,547 Rotary drill bits | 83 | 1998 | |
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| 4,593,777 Drag bit and cutters | 58 | 1984 | |
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| 4,244,432 Earth-boring drill bits | 45 | 1978 | |
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| 5,678,644 Bi-center and bit method for enhancing stability | 97 | 1995 | |
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| 4,792,000 Method and apparatus for well drilling | 26 | 1987 | |
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| 5,119,892 Notary drill bits | 69 | 1990 | |
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| 5,145,016 Rock bit with reaming rows | 59 | 1991 | |
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| 5,443,565 Drill bit with forward sweep cutting elements | 63 | 1994 | |
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| 4,385,669 Integral blade cylindrical gauge stabilizer reamer | 30 | 1981 | |
| 5,180,021 Orientable stabilizer | 12 | 1988 | |
| 4,874,045 Straight hole drilling method and assembly | 14 | 1988 | |
| 5,234,063 Removable wear protective means for a drilling tool | 8 | 1992 | |
Patent Citation Ranking
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | May 27, 2013 |
| Fee | Large entity fee | small entity fee | micro entity fee |
|---|---|---|---|
| Surcharge - 11.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
| Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |