EOR Potential for Lean Gas Reinjection in Zipper Fracs in Liquid-Rich Basins
- Oluwanifemi Akinluyi (University of Tulsa) | Randy Hazlett (University of Tulsa)
- Document ID
- Society of Petroleum Engineers
- SPE Improved Oil Recovery Conference, 11-13 April, Tulsa, Oklahoma, USA
- Publication Date
- Document Type
- Conference Paper
- 2016. Society of Petroleum Engineers
- 7.3 Strategic Planning and Management, 7.3.3 Project Management, 5.8.4 Shale Oil, 4.1 Processing Systems and Design, 1.6 Drilling Operations, 5.7 Reserves Evaluation, 5 Reservoir Desciption & Dynamics, 5.2 Reservoir Fluid Dynamics, 4.6 Natural Gas, 1.6.7 Directional Drilling, 4 Facilities Design, Construction and Operation, 4.1.2 Separation and Treating, 5.4 Enhanced Recovery, 5.4 Enhanced Recovery, 4.6 Natural Gas, 7 Management and Information, 5.7.2 Recovery Factors, 5.8 Unconventional and Complex Reservoirs, 5.4.2 Gas Injection Methods
- unconventional, EOR, liquids, zipper, recycle
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Production from liquid-rich shale has become an important contributor to domestic production in the United States, but recovery factors are low. Enhanced Oil Recovery (EOR) methods require injectivity and interwell communication on reasonable time scales. We conduct a feasibility study for the application of recycled lean gas injection to displace reservoir fluids between zipper fracs in liquid-rich shales.
Using new analytical solutions to the Diffusivity equation for arbitrarily-oriented line sources/sinks plus superposition, we analyze the time for inter-fracture communication development, i.e. interference, and productivity index for both classical bi-wing fractures in a zipper configuration and complex fracture networks. We are able to map both pressure and pressure temporal derivative as a function of time and space for production and/or injection from parallel motherbores under the infinite conductivity wellbore and fracture assumption. The infinite conductivity assumption could be later relaxed for more general cases.
We couch the results in terms of geometrical spacing requirement for both horizontal wells and stimulation treatments to achieve reasonable time frames for inter-fracture communication and sweep for parameters typical of various shale plays. We further analyze whether spacing currently considered for primary production is sufficient for direct implementation of EOR or if current practice should be modified with EOR in the field development plan.
|File Size||4 MB||Number of Pages||17|
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