Evaluation of formation permeability using time-lapse logging measurements during and after drilling. Annual report, December 1991
The authors have developed a concept to compute mudcake buildup based upon the flux of mud filtrate into the formation. The buildup of mudcake depends upon a parameter the authors call adhesion fraction. The adhesion fraction is the percent of the clay particles associated with the filtrate that sticks to form the mudcake on the borehole walls. The adhesion fraction should be a function of the pressure differential between the borehole and the formation, the formation permeability, the shear rate when mud is being circulated, and the drilling mud type. To assist in the development of the mudcake buildup model, the authors have made numberous measurements in the laboratory at the University of Texas to evaluate the mudcake properties and the adhesion fraction. The authors have also analyzed field data during 1991. Drilling information, cores, and logs have been analyzed on GRI's Staged Field Experiment No. 3 and the Mobil Lake Creek Unit 48 well in Montgomery County. The authors have successfully historically matched the mud filtrate invasion data i four zones in SFE No. 3 The authors have also successfully correlated the core permeability with the deep and medium induction log readings in SFE No. 3. Additional analyses for Lake Creek Unit 48 will be completed after the final logging runs and the special core analyses have been completed. During 1991, the authors collected most of the radial response functions they needed to write a topical report and explain how these functions can be used to analyze data from repeat logging measurements. The radial response functions are being used in a Logging Tool Response Simulator to predict the readings from logging tools given the distribution of water saturation, water salinity, and fluid density around the borehole.
- Research Organization:
- Texas A and M Univ., College Station, TX (United States)
- OSTI ID:
- 6828320
- Report Number(s):
- PB-93-124949/XAB; CNN: GRI-5089-260-1861
- Country of Publication:
- United States
- Language:
- English
Similar Records
Mudcake buildup and invasion in low permeability formations; application to permeability determination by measurement while drilling. Topical report, September 1991-August 1993
Reservoir permeability estimation from time-lapse log data
Related Subjects
020300* -- Petroleum-- Drilling & Production
ADHESION
BOREHOLES
BUILDUP
CAVITIES
DATA ANALYSIS
DENSITY
DEVELOPED COUNTRIES
DISTRIBUTION
DRILLING
ENGINEERING
EVALUATION
FEDERAL REGION VI
FUNCTIONS
HYDROGEN COMPOUNDS
INDUCTION
INFORMATION
NORTH AMERICA
OXYGEN COMPOUNDS
PARTICLES
PERMEABILITY
PHYSICAL PROPERTIES
RESERVOIR ENGINEERING
RESPONSE FUNCTIONS
SALINITY
SATURATION
SHEAR
TEXAS
USA
WALLS
WATER
WATER SATURATION
WELL DRILLING
WELL LOGGING
ZONES