A Systematic Approach for Reducing Scaling Effects and Enhancing Production in Depleted Carbonate Reservoirs in the Permian Basin
- Tasos Boulis (Occidental Petroleum) | Logan Millsaps (Occidental Petroleum) | Tony Troutman (Occidental Petroleum) | Dustin Polk (Occidental Petroleum)
- Document ID
- Society of Petroleum Engineers
- SPE Liquids-Rich Basins Conference - North America, 5-6 September, Midland, Texas, USA
- Publication Date
- Document Type
- Conference Paper
- 2018. Society of Petroleum Engineers
- field cases, Acidizing Carbonates Scaling, yeso formation, permian basin, Permian Unconventional oil reservoir
- 1 in the last 30 days
- 112 since 2007
- Show more detail
- View rights & permissions
|SPE Member Price:||USD 9.50|
|SPE Non-Member Price:||USD 28.00|
Scaling precipitation in the form of calcium or iron sulfate (CaSO4 – FeSO4) appears to be a common problem in most of the wells completed in the Yeso formation in the Permian Basin. Accumulation of these forms of scale in the perforations and the downhole equipment can create severe production losses and therefore they require constant, some times costly, treatments. Additionally, their presence in the wellbore hinders the efficiency of the acidizing procedures, performed by the operators to further increase the productivity of their wells.
The objective of this paper is to present an innovative workflow, which significantly reduces the scaling effects and allows the acidizing of these carbonate reservoirs to be more efficient. Results are avialble for more than 20 wells, from Occidental Petroleum’s assets in the North New Mexico region. Details regarding the evolution of the procedure, the types and amounts of the chemicals are extensively discussed in this paper.
The procedure starts with the candidate well selection, which preferably are located in the highest OOIP areas to maximize the efficiency. The second step involves the water sampling and analysis to determine the types of scaling and consequently the required chemical treatment. The innovation in this step has to do with the time that converters are left in the wellbore and the extra chemicals that have been added compared to the previous procedures. The last step involves the deployment of the acid downhole, where three different methodologies have been tested and evaluated based on their efficiency and well returns.
The proposed approach has been successfully applied to more than 20 wells and the results are encouraging showing an average incremental oil production of ~600% while the execution cost remains very low.
|File Size||1 MB||Number of Pages||11|
Al-khaldi Mohammed H., AlJuhani, A., Al-Mutairi, S. H., & Gurmen, M. N., 2011, New Insights into the Removal of Calcium Sulfate Scale. Society of Petroleum Engineers. doi: 10.2118/144158-MS
Carlberg, B.L., and R.R. Mattews, 1973, Solubility of Calcium Sulfate in Brine, Society of Petroleum Engineers. doi: 10.2118/4353-MS
Delorey, J.R, S. Allen, L. McMaster, 1996, Precipitation of calcium sulfate during carbonate acidizing: Minimizing the risk, Petroleum Society of Canada. doi: 10.2118/96-84
Kerans, C., and Ruppel, S. C., 1994, San Andres sequence framework, Guadalupe Mountains: implications for San Andres type section and subsurface reservoirs, in Garber, R. A., and Keller, D. R., eds., Field guide to the Paleozoic section of the San Andres Mountains: Permian Basin Section SEPM Publication 94-35, p. 105–116.
Krenger, J. T., Fraser, J., Gibson, A. J., Whitsett, A., Melcher, J., & Persac, S. (2015, October 13). Refracturing Design for Underperforming Unconventional Horizontal Reservoirs. Society of Petroleum Engineers. doi: 10.2118/177306-MS
Quintero, H., Maley, D. M., & Zafar, F., 2014, Prevention of Dissolution and Re-Precipitation of Calcium Sulfate While Acidizing. International Petroleum Technology Conference. doi: 10.2523/IPTC-17827-MS
Sadeghazad, A., Christiansen, R. L., Sobhi, G. A., & Edalat, M., 2000, The Prediction of Cloud Point Temperature: In Wax Deposition. Society of Petroleum Engineers. doi: 10.2118/64519-MS