Effect of capillary bridges on the dispersion coefficient. Project OE3, Task 10
Dispersion experiments were conducted in water-wet, fired Berea sandstone core material to evaluate the effect of introducing various materials as capillary bridges between core sections. Single phase dispersion tests and relative permeability measurements were conducted on the whole core. The core was cut into sixteen 3-in.-long sections and restacked to yield a composite core with the same order and bedding plane orientation. Dispersion and relative permeability measurements were repeated. The core was disassembled, and two layers of KIMWIPE (a tissue paper-type material) were inserted between the plugs, and dispersion and relative permeability experiments were again repeated. The introduction of the tissue capillary bridges reduced the relative permeability. An x-ray computer aided tomography scan (CATSCAN) run on the sectioned core with capillary bridges indicated that the displacing phase saturation was higher on the upstream side of each core section and that the wetting phase saturation showed an increase toward the producing end of the core in both water-displacing-oil and oil-displacing-water experiments. Dispersion experiments indicate that a capillary bridges are beneficial; however, relative permeability curves and CATSCAN results do not confirm this observation. Results of the CATSCAN experiments indicate that one should but exactly parallel cut cores together without paper capillary bridges. The use of composite cores in long corefloods may give lower oil recovery values than that expected for a whole core. The study indicates some critical experimental points that need to be incorporated if composite cores are to be used to simulate field conditions. 19 refs., 6 figs., 4 tabs.
- Research Organization:
- National Inst. for Petroleum and Energy Research, Bartlesville, OK (USA)
- DOE Contract Number:
- FC22-83FE60149
- OSTI ID:
- 5197364
- Report Number(s):
- NIPER-168; ON: DE87001390
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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020300* - Petroleum- Drilling & Production