Investigation of radial invasion of mud filtrate in porous media

John M. Breitmeier, William C. Tosch, Michael A. Adewumi, Melvin N. Miller

Research output: Contribution to conferencePaper

5 Citations (Scopus)

Abstract

This study explores the rate of drilling mud filtrate invasion. Resistivity probes inserted into 1 inch by 1 foot slabs of Berea Sandstone monitored the advance of the saltwater filtrate leaking outward from a central borehole. The slabs were first saturated with brine and flooded to residual water saturation with oil. Attapulgite muds with varying filtration rates were then circulated past the sandface and both invasion fronts and dynamic filtration rate data were collected. Variations in permeability, wellbore pressure, and in-situ oil viscosity were investigated. Analysis of the data showed that dynamic filtration rate is clearly the most important factor in determining invasion rate. A simple, semiempirical, mathematical model is developed to predict invasion rate given wellbore radius, approximate porosity, and dynamic filtration data. One immediate use for improved filtration data is in determining where to locate "measurement while drilling" (MWD) logging tools on the drillstring so that they can read substantially uninvaded formations, that is, before mud filtrate "has had a chance to invade the zone of interest. Results of this study indicate that with normal wellbore sizes, the logging tool may need to reach the zone of interest within 15-40 minutes of the time the bit reaches the formation.

Original languageEnglish (US)
StatePublished - Jan 1 1989
EventSPWLA 30th Annual Logging Symposium 1989 - Denver, United States
Duration: Jun 11 1989Jun 14 1989

Other

OtherSPWLA 30th Annual Logging Symposium 1989
CountryUnited States
CityDenver
Period6/11/896/14/89

Fingerprint

Porous materials
porous medium
mud
Drilling fluids
Sandstone
Boreholes
slab
Drilling
Porosity
drilling
Viscosity
Mathematical models
oil
brine
rate
Water
electrical resistivity
viscosity
borehole
porosity

All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology
  • Energy Engineering and Power Technology

Cite this

Breitmeier, J. M., Tosch, W. C., Adewumi, M. A., & Miller, M. N. (1989). Investigation of radial invasion of mud filtrate in porous media. Paper presented at SPWLA 30th Annual Logging Symposium 1989, Denver, United States.
Breitmeier, John M. ; Tosch, William C. ; Adewumi, Michael A. ; Miller, Melvin N. / Investigation of radial invasion of mud filtrate in porous media. Paper presented at SPWLA 30th Annual Logging Symposium 1989, Denver, United States.
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Breitmeier, JM, Tosch, WC, Adewumi, MA & Miller, MN 1989, 'Investigation of radial invasion of mud filtrate in porous media' Paper presented at SPWLA 30th Annual Logging Symposium 1989, Denver, United States, 6/11/89 - 6/14/89, .

Investigation of radial invasion of mud filtrate in porous media. / Breitmeier, John M.; Tosch, William C.; Adewumi, Michael A.; Miller, Melvin N.

1989. Paper presented at SPWLA 30th Annual Logging Symposium 1989, Denver, United States.

Research output: Contribution to conferencePaper

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N2 - This study explores the rate of drilling mud filtrate invasion. Resistivity probes inserted into 1 inch by 1 foot slabs of Berea Sandstone monitored the advance of the saltwater filtrate leaking outward from a central borehole. The slabs were first saturated with brine and flooded to residual water saturation with oil. Attapulgite muds with varying filtration rates were then circulated past the sandface and both invasion fronts and dynamic filtration rate data were collected. Variations in permeability, wellbore pressure, and in-situ oil viscosity were investigated. Analysis of the data showed that dynamic filtration rate is clearly the most important factor in determining invasion rate. A simple, semiempirical, mathematical model is developed to predict invasion rate given wellbore radius, approximate porosity, and dynamic filtration data. One immediate use for improved filtration data is in determining where to locate "measurement while drilling" (MWD) logging tools on the drillstring so that they can read substantially uninvaded formations, that is, before mud filtrate "has had a chance to invade the zone of interest. Results of this study indicate that with normal wellbore sizes, the logging tool may need to reach the zone of interest within 15-40 minutes of the time the bit reaches the formation.

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Breitmeier JM, Tosch WC, Adewumi MA, Miller MN. Investigation of radial invasion of mud filtrate in porous media. 1989. Paper presented at SPWLA 30th Annual Logging Symposium 1989, Denver, United States.