Boots – shoes – and leggings
Patent
1988-03-25
1990-04-03
Smith, Jerry
Boots, shoes, and leggings
73818, 73152, 73783, 367 25, 175 40, 175 50, G01N 3324, E21B 704
Patent
active
049145916
ABSTRACT:
A method is disclosed for determining rock compressive strength of a subterranean formation penetrated by a wellbore. A mathematical model of a drill bit and an estimate of rock ductility of a particular subterranean formation in conjunction with weight-on-bit (WOB), bit rotational speed RPM, and rate of penetration (ROP) are used as inputs. From the above inputs, the rock compressive strength can be determined while the wellbore is being drilled or afterwards. A depth correlated log can be generated of rock compressive strength that can be compared to other logs obtained from adjacent wellbores to obtain a refined estimate of the depth of a particular subterranean formation feature. Further, the above method can be utilized for obtaining an indication of bit wear or bit damage while the bit is drilling a wellbore by comparing a first rock compressive strength log of a wellbore to a rock compressive strength log being generated while the drill bit is actually drilling a second wellbore. Any significant deviation between the two logs provides an indication of bit wear or bit damage.
REFERENCES:
patent: 4396071 (1983-08-01), Stephens
patent: 4599904 (1986-07-01), Fontenot
patent: 4627276 (1986-12-01), Burgess
patent: 4733733 (1988-03-01), Bradley
Warren, T. M., "Penetration-Rate Performance of Roller-Cone Bits", SPE Drilling Engineering, Mar. 1987, pp. 9-18.
Winters et al., "Roller Bit Model with Rock Ductility and Cone Offset", 62nd Annual Technical Conference and Technical Conference and Exhibition of Petroleum Engineers, Dallas, Tx., Sep. 27-30, 1987.
Onyia Ernest C.
Warren Tommy M.
Winters Warren J.
Amoco Corporation
Brown Scott H.
Hayes Gail O.
Hook Fred E.
Smith Jerry
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