Computed-Tomography Measurements of Water Block in Low-Permeability Rocks: Scaling and Remedying Production Impairment
- Tianbo Liang (China University of Petroleum, Beijing and University of Texas at Austin) | Xiao Luo (University of Texas at Austin) | Quoc Nguyen (University of Texas at Austin) | David A. DiCarlo (University of Texas at Austin)
- Document ID
- Society of Petroleum Engineers
- SPE Journal
- Publication Date
- June 2018
- Document Type
- Journal Paper
- 762 - 771
- 2018.Society of Petroleum Engineers
- Capillarity, Low-Permeability Rocks, Water Block, Shut In
- 6 in the last 30 days
- 413 since 2007
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Fracturing-fluid invasion into the rock matrix can generate water block that potentially reduces hydrocarbon production, especially in low-permeability reservoirs. Here, we experimentally investigate the dynamics of water block under different flow scenarios (i.e., without shut-ins) and rock permeabilities through multiple coreflood experiments. A computed-tomography (CT) scanner is used to obtain the saturation profile within the core throughout the experiment, while the overall hydrocarbon productivity is measured from the overall pressure drop across the core.
On the basis of the saturation and pressure measurements, we interpret the potential physical mechanism regarding the productivity reduction from water block and its self-mitigation facilitated by the capillary imbibition. Our interpretation also matches the observed scaling with rock permeability and the optimal shut-in time.
|File Size||903 KB||Number of Pages||10|
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