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Optimum Acid-Fracturing Treatments for Ultradeep Limy Dolomite Reservoirs Based on Conductivity Tests
- Source :
- Chemistry and Technology of Fuels and Oils. 53:107-122
- Publication Year :
- 2017
- Publisher :
- Springer Science and Business Media LLC, 2017.
-
Abstract
- Acid-fracture conductivity has a major impact on acid-fracturing effects. In this paper, influences of acid concentration, temperature, and closure-stress loading time on conductivity under different acid-fluid systems have been researched based on experimental analysis for deep limy dolomite reservoirs. The measured conductivity showed high correlation and specific changing patterns with the above factors. Quantified relationships and equations between the conductivity and these factors were suggested in this paper. Additionally, a strong acid-etching effect caused by crosslinked acid and diverting acid has been observed during the tests. This could lead to high conductivity as well as broken rocks due to pressing with high-concentration acid. In this study, a 50-hour long-term conductivity test has been designed under the closure stress of 60 MPa which was closest to the actual reservoir conditions. The results showed that conductivity retention rate for each test group is less than 40%. By establishing assessment criteria of long-term and short-term conductivity based on the conductivity retention rate, linear relationships with high correlation and quantified equations of the conductivity retention rate in the same acid-rock reaction system could be obtained.
- Subjects :
- Pressing
Acid concentration
Materials science
Test group
High conductivity
General Chemical Engineering
Dolomite
Energy Engineering and Power Technology
Mineralogy
Soil science
02 engineering and technology
General Chemistry
Conductivity
010502 geochemistry & geophysics
01 natural sciences
Stress (mechanics)
Fuel Technology
020401 chemical engineering
Acid fracturing
0204 chemical engineering
0105 earth and related environmental sciences
Subjects
Details
- ISSN :
- 15738310 and 00093092
- Volume :
- 53
- Database :
- OpenAIRE
- Journal :
- Chemistry and Technology of Fuels and Oils
- Accession number :
- edsair.doi...........1589cbf7142cac15f030e89e5a5b173e