William Sterling Donovan
Engineers at Phillips Dr, Littleton, CO
License number
Colorado 26587
Issued Date
Dec 18, 1989
Renew Date
Nov 1, 2015
Expiration Date
Oct 31, 2017
Type
Professional Engineer
Address
Address
780 E Phillips Dr S, Littleton, CO 80122
Professional information
Drilling Nipple Gas Trap
US Patent:
5007488, Apr 16, 1991
Filed:
May 16, 1990
Appl. No.:
7/524163
Inventors:
William S. Donovan - Littleton CO
Assignee:
Donovan Brothers Incorporated - Littleton CO
International Classification:
E21B 2100
US Classification:
175 59
Abstract:
The present invention is a gas sampling device. A gas sampling tube and pump withdraw gas which evolves into the atmosphere as the drilling fluid in the annular space exits the wall bore. Drilling fluid and debris which may be entrained in the gas sample are separated by gravity settling in a separation device. A purge line may be used to agitate drilling mud and force gas toward the gas sampling tube.
Compensated Gamma Ray Mudlog
US Patent:
5165275, Nov 24, 1992
Filed:
Jun 7, 1990
Appl. No.:
7/535333
Inventors:
William S. Donovan - Littleton CO
Assignee:
Donovan Brothers, Inc. - Littleton CO
International Classification:
G01V 504
US Classification:
73153
Abstract:
A method and apparatus for measuring the gamma radiation levels of drilling mud expelled from an oil and gas bore hole to determine the composition of the earth at the bottom of the bore hole and, when used in conjunction with a Measurement While Drilling gamma radiation detector, to determine the time and location of bore hole cavings. A first gamma radiation detector measures the gamma radiation level of the drilling mud with the bore hole entrained material, and a second gamma radiation detector measures the gamma radiation of the drilling mud without the entrained material. The difference between the two measurements is lagged to the time between the detectors and the bore hole bottom.