Relationship of pore structure to fluid behavior in low permeability gas sands: Phase II. Final technical report
Technical Report
·
OSTI ID:6982932
The objective of the project is to carry out advanced core analyses on tight sandstones and in particular explain: (a) what structural features cause their permeabilities to often show marked sensitivity to overburden pressure; (b) the superimposed effects of water saturation on gas permeabilities. Several interrelated aproaches are being taken to this work. A group of low permeability core samples were selected for their variation in geologic character, and permeabilities were measured. Detailed core analysis was carried out on each sample and correlations between pressure sensitivity and other core properties were investigated. In order to test the possible need for carrying out tests on tight sands at formation temperatures in addition to formulation pressures, a study of the combined effects of temperature and overburden pressure on gas permeabilities has been made. Results show temperature to have no significant effect on either liquid or gas permeabilities for overburden pressures ranging from 500 to 5000 psi. Photomicrographs of pore casts of numerous low permeability sandstones show pores to be flattened somewhat like the contact surfaces of a randomized honeycomb. In developing an explanation of sensitivity of permeability to overburden pressure, special attention was given to flow in crack-shaped pores. Attention has also been given to mathematical modelling of overburden sensitivity. More recently obtained test samples include a large number of cores from the Multiwell Test Site. Selection of cores is guided partly by the needs and interests of other investigators involved in the Multiwell Project.
- Research Organization:
- New Mexico Inst. of Mining and Technology, Socorro (USA). New Mexico Petroleum Recovery Research Center
- OSTI ID:
- 6982932
- Report Number(s):
- NMERDI-270-3303; ON: DE84901097
- Country of Publication:
- United States
- Language:
- English
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