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- Title
RESEARCH ON ACID LEAKOFF REDUCTION BY INJECTING LARGE VOLUME OF SLICK WATER IN ACID FRACTURING OF NATURALLY FRACTURED OIL RESERVOIRS.
- Authors
JIANYE MOU; CHUNYUE LI; SHICHENG ZHANG; DONG LI
- Abstract
In acid fracturing of naturally fractured carbonate oil reservoirs in Tahe oilfield, the serious acid leakoff is the main factor that limits fracture propagation and live acid penetration distance. Reducing acid leakoff is the primary mean to increase live acid penetration distance. In this paper we did a research on an acid leakoff reduction technology by injecting large volume of slick water before acid injection in naturally fractured carbonate oil reservoirs. Firstly a new model was developed to simulate leakoff process of slick water plus acid in naturally fractured carbonates. Then based on the model extensive numerical study was conducted to investigate the leakoff behaviour of slick plus acid and the effect of slick water injection on acid leakoff. Next slick water volume and injection stage were optimised based on reservoir properties. Finally successful application cases of this technology to Tahe oilfield were provided. This research reveals the mechanism of acid leakoff reduction by injecting large volume of slick water and provides theoretical foundation for acid fracturing optimisation designs.
- Subjects
OIL wells; HYDRAULIC fracturing; CARBONATES; ACIDS; VISCOSITY; ROCKS; REACTIVITY (Chemistry)
- Publication
Oxidation Communications, 2016, Vol 39, Issue 3-II, p2566
- ISSN
0209-4541
- Publication type
Article