An Experimental Evaluation of Pore Plugging and Permeability Reduction Near SAGD Sand Control Liners
- Mahdi Mahmoudi (University of Alberta) | Vahidoddin Fattahpour (University of Alberta) | Alireza Nouri (University of Alberta) | Michael Leitch (RGL Reservoir Management)
- Document ID
- Society of Petroleum Engineers
- SPE Canada Heavy Oil Technical Conference, 15-16 February, Calgary, Alberta, Canada
- Publication Date
- Document Type
- Conference Paper
- 2017. Society of Petroleum Engineers
- 4.5.7 Controls and Umbilicals, 4.3.4 Scale, 4 Facilities Design, Construction and Operation, 3 Production and Well Operations, 3 Production and Well Operations, 2.4 Sand Control, 2.2 Installation and Completion Operations, 5.3.9 Steam Assisted Gravity Drainage, 5.8.5 Oil Sand, Oil Shale, Bitumen, 1.8 Formation Damage, 4.5 Offshore Facilities and Subsea Systems, 1.8.3 Fines Migration, 3.2.3 Produced Sand / Solids Management and Control, 3 Production and Well Operations, 1.14 Casing and Cementing, 5 Reservoir Desciption & Dynamics, 3.2 Well Operations and Optimization, 2 Well completion, 0.2 Wellbore Design, 5.8 Unconventional and Complex Reservoirs, 5.1.1 Exploration, Development, Structural Geology, 1.14.1 Casing Design, 5.1 Reservoir Characterisation, 5.1 Reservoir Characterisation
- Fines migration, Slot size, Sand Retention Test, Pore plugging, Slot density
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This paper presents the results of an experimental investigation to determine the mechanisms of pore plugging and permeability reduction near SAGD screen liners. The aim is to arrive at a liner design that maximizes wellbore productivity without compromising the sand control function of the liner.
We set up a large-scale Sand Retention Testing (SRT) facility that accommodates a multi-slot liner coupon at the base of a sand-pack with representative grain shape and particle size distribution (PSD) of typical oil sands. Brine is injected at different flow rates and pressure differences across the coupon and the sand-pack as well as the mass and PSD of the produced sand and fines are measured during the test. Further, the PSD and concentration of migrated fines (<44 microns) along the sand-pack are determined in a post-mortem analysis. The testing results are used to assess the effect of slot size and slot density on the sand control performance as well as pore-plugging and permeability alterations near the sand-control liner.
We observed that the slot size, slot density and flow rate highly affect the concentration and PSD of produced fines as well as accumulated fines (pore clogging) above the screen. For the same flow rates and total injected pore volume, wider screen aperture and higher slot density result in lower fines accumulation above the screen but more sanding. Further, the variation of slot density alters the flow convergence behind the slots, hence, the size and concentration of mobilized fines. Results indicate that higher fines concentration near the screen reduces the retained permeability, hence, lowers the wellbore productivity.
This paper provides a new insight into pore plugging and fines migration adjacent the sand control liner. It also introduces a new testing method to optimize the design of sand control liners for minimum productivity impairment in SAGD projects.
|File Size||2 MB||Number of Pages||18|
Mahmoudi, M., Fattahpour, V., Nouri, A., Rasoul, S., Yao, T., Baudet, B. A., and Soroush, M. 2016d. Investigation into the Use of Commercial Sands and Fines to Replicate Oil Sands for Large-Scale Sand Control Testing. Presented at SPE Thermal Well Integrity and Design Symposium, 28 November-1 December, Banff, Alberta, Canada, SPE-182517-MS.
Mahmoudi, M., Roostaei, M., and Ghalambor, A. 2016a. Sand Screen Design and Optimization for Horizontal Wells Using Reservoir Grain Size Distribution Mapping. Presented at the SPE International Conference and Exhibition on Formation Damage Control, 24-26 February, Lafayette, Louisiana, SPE-179036-MS.