A new analysis of pressure decline for acid fracturing
Conference
·
OSTI ID:166582
The conventional analysis of pressure decline has been successfully used to determine in-situ fluid-loss coefficient and fracture geometry of a minifrac test or a full scale hydraulic fracturing. However, it either fails in interpreting pressure decline data because of the difference of fluid-loss mechanism or is not suitable as the testing time is short. This paper presents a new analysis of pressure decline for full scale or mini acid fracturing to estimate fluid-loss coefficient and to evaluate fracture geometry for PKN model. The models established after shut-in have comprehensively considered the influences of compressibility and thermal expansion of fluids(waste acid and CO{sub 2} gas produced by reaction) and the rock volume etched away by acid. The effects of formation temperature and reaction heat are also taken into account in this analysis. The analytical solution derived by Nordgren for large fluid-loss is used to calculate fracture widths along a fracture. As simulation technique is employed in analysing, the test data of short time for acid fracturing can be interpreted. The comparison of results interpreted by conventional analysis and this analysis for field test data shows that the conventional analysis causes the error of -56.2% in fluid-loss coefficient and the fluid-loss is underestimated. The errors of fluid efficiency, hydraulic fracture length and width occur 186.2%, 220.8% and 16.5% respectively.
- OSTI ID:
- 166582
- Report Number(s):
- CONF-951002--
- Country of Publication:
- United States
- Language:
- English
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