Rolling cone steel tooth bit with enhancements in cutter shape a

Details Rolling cone steel tooth bit with enhancements in cutter shape a Rolling cone steel tooth bit with enhancements in cutter shape a

1997-04-04

1998-11-24

Tsay, Frank

Boring or penetrating the earth

Bit or bit element

Specific or diverse material

175378, E21B 1016

Patent

active

058395261

ABSTRACT:
A steel tooth bit includes one or more rolling cone cutters having a generally conical surface, a heel surface, and preferably a transition surface therebetween. A row of gage cutter elements are secured to the cone cutter on the transition surface and have cutting surfaces that cut to full gage. A first inner row of off-gage steel teeth is positioned on the conical surface of the cone cutter so that the gage-facing cutting surfaces of the teeth are close to gage, but are preferably off-gage a distance D at a knee that is formed on the gage facing surface. Distance D is strategically selected such that the gage and off-gage cutter elements cooperatively cut the corner of the borehole. The lower most portion of the gage facing surface of these steel teeth are off gage a distance D' which is greater than D so as to bring the cutting tip of the teeth off gage to prevent undesired wear and rounding off of the tip of the cutter element. The upper most portion of the gage-facing surface is also preferably off gage a distance D" that is greater than D so as to optimize the surface area on the gage facing surface that is in contact with the borehole corner.

REFERENCES:
patent: 930759 (1909-08-01), Hughes
patent: 1325944 (1919-12-01), Hughes
patent: 1480014 (1924-01-01), Scott
patent: 2104822 (1938-01-01), Scott
patent: 2203846 (1940-06-01), Stancliff
patent: 2244617 (1941-06-01), Hannum
patent: 2333746 (1943-11-01), Scott et al.
patent: 2363202 (1944-11-01), Scott
patent: 2527838 (1950-10-01), Morlan et al.
patent: 2660405 (1953-11-01), Scott et al.
patent: 2774570 (1956-12-01), Cunningham
patent: 2804282 (1957-08-01), Spengler, Jr.
patent: 2851253 (1958-09-01), Boice
patent: 2887302 (1959-05-01), Garner
patent: 2907551 (1959-10-01), Peter
patent: 2927777 (1960-03-01), Steen
patent: 2927778 (1960-03-01), Coulter, Jr.
patent: 2939684 (1960-06-01), Payne
patent: 2990025 (1961-06-01), Talbert et al.
patent: 3003370 (1961-10-01), Coulter, Jr. et al.
patent: 3018835 (1962-01-01), Kucera
patent: 3104726 (1963-09-01), Davis
patent: 3126067 (1964-03-01), Schumacher, Jr.
patent: 3223188 (1965-12-01), Coulter, Jr. et al.
patent: 3389761 (1968-06-01), Ott
patent: 3401759 (1968-09-01), White
patent: 3504751 (1970-04-01), Agoshashvilli et al.
patent: 3743038 (1973-07-01), Bennett
patent: 4086973 (1978-05-01), Keller et al.
patent: 4262761 (1981-04-01), Crow
patent: 4343371 (1982-08-01), Baker, III et al.
patent: 4420050 (1983-12-01), Jones
patent: 4604106 (1986-08-01), Hall et al.
patent: 4629373 (1986-12-01), Hall
patent: 4694918 (1987-09-01), Hall
patent: 4716977 (1988-01-01), Huffstutler
patent: 4726432 (1988-02-01), Scott et al.
patent: 4811801 (1989-03-01), Salesky et al.
patent: 4832139 (1989-05-01), Minikus et al.
patent: 4836307 (1989-06-01), Keshavan et al.
patent: 5027913 (1991-07-01), Nguyen
patent: 5051112 (1991-09-01), Keshavan et al.
patent: 5131480 (1992-07-01), Lockstedt et al.
patent: 5145016 (1992-09-01), Estes
patent: 5152194 (1992-10-01), Keshavan et al.
patent: 5172777 (1992-12-01), Siracki et al.
patent: 5172779 (1992-12-01), Siracki et al.
patent: 5197555 (1993-03-01), Estes
patent: 5201376 (1993-04-01), Williams
patent: 5287936 (1994-02-01), Grimes et al.
patent: 5311958 (1994-05-01), Isbell et al.
patent: 5322138 (1994-06-01), Siracki
patent: 5323865 (1994-06-01), Isbell et al.
patent: 5341890 (1994-08-01), Cawthorne et al.
patent: 5346026 (1994-09-01), Pessier et al.
patent: 5351768 (1994-10-01), Scott et al.
patent: 5351769 (1994-10-01), Scott et al.
patent: 5351770 (1994-10-01), Cawthorne et al.
patent: 5351771 (1994-10-01), Zahradnik
patent: 5353885 (1994-10-01), Hooper et al.
patent: 5407022 (1995-04-01), Scott et al.
patent: 5415244 (1995-05-01), Portwood
patent: 5421424 (1995-06-01), Portwood et al.
patent: 5445231 (1995-08-01), Scott et al.
patent: 5456327 (1995-10-01), Denton et al.
patent: 5479997 (1996-01-01), Scott et al.
patent: 5492186 (1996-02-01), Overstreet et al.
patent: 5542485 (1996-08-01), Pessier
patent: 5579856 (1996-12-01), Bird
patent: 5592995 (1997-01-01), Scott et al.
patent: 5697462 (1997-12-01), Grimes et al.
Liang, D.B., M.K. Keshavan and S.D. McDonough, "The Development of Improved Soft Formation Milled Tooth Bits," Proceedings of the SPE/IADC Drilling Conference held Feb. 23-25, 1993, Amsterdam, pp. 605-614.
Smith International, Inc. internal documents; Exhibit A comprises drawings of certain cutter inserts that were included on drill bits sold before Apr. 4, 1997; Exhibit B includes a drawing of a cutter insert that was included on drill bits sold before Apr. 4, 1997; (See accompanying IDS).

Affiliated with

Also associated with

Rating

Rolling cone steel tooth bit with enhancements in cutter shape a does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Rolling cone steel tooth bit with enhancements in cutter shape a, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rolling cone steel tooth bit with enhancements in cutter shape a will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1694408