Pressure Depletion’s Impact on Induced Strain During Hydraulic Fracturing in Child Wells: The Key to Mitigate Fracture Hits and Pressure Interference
- S. Vargas-Silva (FracGeo) | A. Khodabakhshnejad (FracGeo) | M. Paryani (FracGeo) | K. Venepalli (CMG) | A. Ouenes (FracGeo)
- Document ID
- Society of Petroleum Engineers
- SPE Canada Unconventional Resources Conference, 13-14 March, Calgary, Alberta, Canada
- Publication Date
- Document Type
- Conference Paper
- 2018. Society of Petroleum Engineers
- 5 Reservoir Desciption & Dynamics, 2 Well completion, 5.5 Reservoir Simulation, 2.4.1 Fracture design and containment, 2.4 Hydraulic Fracturing, 5.1.5 Geologic Modeling, 5.1.1 Exploration, Development, Structural Geology, 0.2 Wellbore Design, 0.2.2 Geomechanics, 3 Production and Well Operations, 5.1 Reservoir Characterisation
- well interference, Hydraulic fracturing, Pressure Depletion, Fracture hits, Geomechanics
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Productivity of hydraulically stimulated unconventional wells depends greatly on the successful interconnection of the enhanced permeability and the natural fracture system. Such success is achived by proper understanding of the distribution of mechanical properties of the rock, presence of natural fractures, and regional stresses characterisitcs. With this understanding of the reservoirthe response of the rock to the stimulation can be quantified. Currrently, there are multiples approaches adopted by the industry to support such a process, making fracture designs more robust and reliable. However, theseworkflows often neglect the underlying physics of pressure wave propagation throughout the reservoir, crossing geological features such as faults, natural fractures, ash and karst layers among others.
Pressure depletion caused by production of the first well in a section (parent well) generates continuous changes in stress magnitude and orientation. Simplistic geomechanical models ignore such effects and usually are built based on original conditions, resulting in overestimation of induced strain which will be reflected in oversized hydraulic fracture jobs that negatively affect not only the subsequent wells (child wells) but also the first well in section itself. Negative effects such as frac hits are usually irreversible, and proper estimation of the potential damage needs to be quantified and understood in order to put in place a mitigation plan.
This work presents a workflow where changes in the pressure field are incorporated and taken into consideration during geomechanical modeling of induced strain using full continuum mechanics. As a result, hydraulic fracture designs are adjusted to the reservoir conditions at the time a new child well will be drilled and completed, thus reducing thepotential for negative effects such as frac hits.
A fracture design for a planned child well to be drilled after two years of production of its parentis presented under two scenarios: first, ascenario ignoring the effect of pressure depletion, second, a scenario using the full continuum geomechanical solution to account for the effects of parent depletion.
Results of the fracture design are migrated to dynamic simulation to estimate the effect on the resulting EUR.
|File Size||1 MB||Number of Pages||7|
Ahmed, I., Oza, S., Vargas-Silva, S., Poludasu, S., Paryani, M., Attia, B., Smaoui, R., Umholtz, N. and Ouenes, A. (2017). Cracking the code of unconventional reservoir simulation. Society of Petroleum Engineers. doi: 10.2118/188111-MS
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Ng, M., Hughes, R., Peterson, N., Hlidek, B., Aimene, Y., Khodabakhshnejad, A., Li, X., (2018), Case Study of Time-Based Stress Shadow Influences on New Well Fracture Propagation Patterns in the Montney, paper SPE 189813 presented at the SPE Canada Unconventional Resources Conference held in Calgary, Alberta, Canada, 13-14 March 2018
Khodabakhshnejad, A., Aimene, Y., Mistry, N., Bachir, A., Ouenes, A. (2017). A fast Method to Forecast Shale Pressure Depletion and Well Performance Using Geomechancal Constrains – Application of Poro-elsticity Modeling to Predict Mid and Far Field Frac Hits at an Eagle Ford and Wolfcamp Well. Society of Petroleum Engineers. Doi:10.2118/187535-MS
Vargas-Silva, S., Oza, S., Paryani, M., Moody, D., Venepalli, K., Patel K., Erdle, J. and Ouenes, A. (2017). Integration of Improved Asymmetric Frac Design Using Strain Derived From Geomechanical Modeling in Reservoir Simulation. Society of petroleum Engineers. doi: 10.2118/182719-MS
Paryani, M., Smaoui, R., Poludasu, S., Attia, B., Umholtz, N., Ahmed, I. and Ouenes, A. (2017) Adaptive Fracturing to Avoid Frac Hits and Interference: A Wolfcamp Shale Case Study. Society of Petroleum Engineers. doi: 10.2118/185044-MS