Well drilling operation control procedure

Details Well drilling operation control procedure Well drilling operation control procedure

1988-02-26

1989-12-12

Neuder, William P.

Boring or penetrating the earth

With signaling, indicating, testing or measuring

175 48, E21B 4700

Patent

active

048861294

ABSTRACT:
The invention relates to the control of rotary type oil drilling operations. During a drilling test in which the drill string is held against vertical motion at the surface, known as the "drill-off test", an exponential decrease as a function of time, in the weight applied to the drill bit (WOB) is noted as is a threshold where the value of WOB remains constant. From this test the drillability of the formation drilled, the bit wear and the actual value of the weight applied to the bit may be determined.

REFERENCES:
patent: 2669871 (1954-02-01), Lubinski
patent: 2670925 (1954-03-01), Des Champs
patent: 3881695 (1975-05-01), Joubert
patent: 4165789 (1979-08-01), Rogers
patent: 4627276 (1986-12-01), Burgess et al.
"Weight/Speed/Penetration" from the Petroleum Engineer, vol. 30, Jan. 1985, pp. 50-52.

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