Effect of drilling fluids on rock surface properties
This paper discusses the wettability change induced by contact between porous media and drilling fluids and the possibility of eliminating such alterations by cleaning. Three porous media were studied (sandstone, shaly sandstone, and carbonate), as well as various drilling fluids (oil- and water-based). Initially strongly water-wet (hydrophilic) and initially neutral rock/oil/brine systems were evaluated. Wettability was estimated by a test based on spontaneous and forced displacement experiments. The results show that all the oil-based drilling fluids used induce a wettability change inasmuch as the rock is initially water-wet. The rock surface properties are observed to be affected at a distance >0.6 in (>1.5 cm) from the rock/drilling-fluid interface. Cleaning procedures with toluene and methanol circulations can return the rock surface to the original wettability state, but the permeability remains affected. Water-based drilling fluids made no appreciable change in the wettability of the three initially highly hydrophilic porous media.
- Research Organization:
- Inst. Francais du Petrole (FR)
- OSTI ID:
- 6162137
- Journal Information:
- SPE (Society of Petroleum Engineers) Format. Eval.; (United States), Vol. 4:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CARBONATE ROCKS
WETTABILITY
DRILLING FLUIDS
EVALUATION
OIL SHALES
SANDSTONES
BRINES
CLEANING
EXPERIMENTAL DATA
METHANOL
POROUS MATERIALS
SURFACE PROPERTIES
TOLUENE
ALCOHOLS
ALKYLATED AROMATICS
AROMATICS
BITUMINOUS MATERIALS
CARBONACEOUS MATERIALS
DATA
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUELS
HYDROCARBONS
HYDROXY COMPOUNDS
INFORMATION
MATERIALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ROCKS
SEDIMENTARY ROCKS
020200* - Petroleum- Reserves
Geology
& Exploration
020300 - Petroleum- Drilling & Production