Optimized drilling with positive displacement drilling motors
US5368108A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 26, 1993 |
| Grant date | Nov 29, 1994 |
| Priority date | — |
| Expiry date | Oct 26, 2013 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B44/005
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
To optimize the drilling of a borehole with a positive displacement downhole mud motor which rotates a drill bit, the hydraulic power input to the motor and the mechanical power output of the motor are calculated based upon measurements of weight-on-bit (WOB), torque, bit rotational speed and pressure drop across the motor. These input and output values are plotted versus one another to produce a characteristic curve which indicates the maximum achievable power output of the motor. The values used by the driller are compared to such maximum to enable adjustment of WOB such that drilling at maximum efficiency for a given lithology can be achieved. Other important information such as optimum standpipe pressure and operating efficiency and wear of the motor also are determined.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.