| 4754819 |
Method for improving cuttings transport during the rotary drilling of a wellbore |
— |
1988-07-05 |
| 4719977 |
Method of drilling deviated wellbores |
— |
1988-01-19 |
| 4697651 |
Method of drilling deviated wellbores |
— |
1987-10-06 |
| 4646855 |
Method for raising and lowering a drill string in a wellbore during drilling operations |
— |
1987-03-03 |
| 4643264 |
Method for reducing drilling torque in the drilling of a deviated wellbore |
— |
1987-02-17 |
| 4577700 |
Method and system for displacing drilling fluid from a drill string in a well drilling system |
William G. Boston, James H. Sexton, Robert T. Strong |
1986-03-25 |
| 4577701 |
System of drilling deviated wellbores |
Wilton Gravley |
1986-03-25 |
| 4573540 |
Method for drilling deviated wellbores |
Eugene A. Hoppe, Charles E. Jones |
1986-03-04 |
| 4431068 |
Extended reach drilling method |
Wilton Gravley |
1984-02-14 |
| 4428441 |
Method and apparatus for reducing the differential pressure sticking tendency of a drill string |
— |
1984-01-31 |
| 4386665 |
Drilling technique for providing multiple-pass penetration of a mineral-bearing formation |
— |
1983-06-07 |
| 4384483 |
Preventing buckling in drill string |
Wilton Gravley, John E. Walraven |
1983-05-24 |
| 4384616 |
Method of placing pipe into deviated boreholes |
— |
1983-05-24 |
| 4384625 |
Reduction of the frictional coefficient in a borehole by the use of vibration |
Wilbur F. Roper |
1983-05-24 |
| 4373592 |
Rotary drilling drill string stabilizer-cuttings grinder |
John W. Kelly |
1983-02-15 |
| 4246975 |
Wellbore drilling technique using eccentric tool joints to mitigate pressure-differential sticking |
— |
1981-01-27 |