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Case Study: Multirate Multizone Production Logging and Testing Provides Real-Time Reservoir Insight for Stimulation Treatment Optimization in Deepwater GOM

Authors
Waqar Khan (Halliburton) | Mehdi Azari (Halliburton) | Farrukh Hamza (Halliburton) | Hamid Hadibeik (Halliburton) | Sandeep Ramakrishna (Halliburton)
DOI
https://doi.org/10.2118/187407-MS
Document ID
SPE-187407-MS
Publisher
Society of Petroleum Engineers
Source
SPE Annual Technical Conference and Exhibition, 9-11 October, San Antonio, Texas, USA
Publication Date
2017
Document Type
Conference Paper
Language
English
ISBN
978-1-61399-542-6
Copyright
2017. Society of Petroleum Engineers
Disciplines
7.1.5 Portfolio Analysis, Management and Optimization, 7 Management and Information, 3 Production and Well Operations, 4.1.2 Separation and Treating, 5 Reservoir Desciption & Dynamics, 5.6.3 Pressure Transient Testing, 5.6 Formation Evaluation & Management, 7.2.1 Risk, Uncertainty and Risk Assessment, 6.3 Safety, 2.6 Acidizing, 4 Facilities Design, Construction and Operation, 3.3.1 Production Logging, 1.8 Formation Damage, 7.1 Asset and Portfolio Management, 3.3 Well & Reservoir Surveillance and Monitoring, 4.1 Processing Systems and Design, 7.2 Risk Management and Decision-Making, 2 Well completion
Keywords
production logging, well testing, stimulation, reservoir testing, formation damage
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2 in the last 30 days
188 since 2007
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Abstract

In a deepwater environment, testing of wells can be an expensive process coupled with safety concerns. Properly characterizing a well has a significant impact on asset management. Wells are routinely stimulated to remove formation damage, but subsequent testing to determine the skin after stimulation is rarely performed. This paper discusses a case study where multirate multizone (MRMZ) pressure-transient testing and production logging was performed in a deepwater well in the Gulf of Mexico (GOM) to determine the effectiveness of the stimulation treatment.

MRMZ production logging was performed across the targeted pay intervals. The process was to flow the well at three different flow rates followed by a shut-in period. During these different rates, production logging was performed by three up and three down passes at each choke setting, followed by a stationary measurement at a predetermined depth for 10 to 15 minutes. Following the last production logging run, the tool was parked between the two pay zones, and the well was shut in for a pressure buildup until radial flow was fully established. After that, the tool performed the final routine production logging passes while the well was still shut in.

Although the oil production almost doubled after the initial stimulation treatment with xylene, the high skin observed in real time from the MRMZ pressure-transient analysis prompted the operator to change the formation damage removal program and stimulate with hydrochloric acid (HCl) by coiled tubing rather than only xylene. This resulted in an immediate fourfold improvement of productivity index with a potential of further doubling.

MRMZ testing is a relatively low-risk, low-cost method for acquiring valuable formation data. This paper additionallydiscusses best practices that should be performed while attempting MRMZ and how deviating from these practices can lead to increased uncertainty in the acquired data.

File Size  2 MBNumber of Pages   15

Denney D. 2009. Pressure-Transient Testing and Production Logging To Monitor Performance of the Mars Deepwater Field. J Pet Technol 61 (2): 89–91. https://doi.org/10.2118/0209-0089-JPT.

Hamza F., Staib E., Cottle E.. 2015. Application of Pulsed Neutron Logging to Enhance Production from Mature Fields. Presented at the India Oil and Gas Review Summit & International Exhibition, Mumbai, India, 9–10 September.

Sullivan M., Belanger D., and Skalinski M. 2006. A New Method for Deriving Flow Calibrated Permeability from Production Logs. Presented at the SPWLA 47th Annual Logging Symposium, Veracruz, Mexico, 4–7 June. SPWLA-2006-K.

van der Horst J., Frisch G., Quirein J.. 2005. Formation Compaction Surveillance in Deepwater Gulf of Mexico: Applications, Experiences, and Best Practices. Presented at the SPWLA 46th Annual Logging Symposium, New Orleans, Louisiana, 26–29 June. SPWLA-2005-RRR.

Weiland J., Azari M., Suparman F.. 2008. Case History Review of the Application of Pressure Transient Testing and Production Logging in Monitoring the Performance of the Mars Deepwater Gulf of Mexico Field. Presented at the SPE Annual Technical Conference and Exhibition, Denver, Colorado, 21–24 September. SPE-115591-MS. https://doi.org/10.2118/115591-MS.

Weiland J., Mikulencak D., Fox P.. 2008. Waterflood Surveillance in the Mars Field Deepwater GOM: Mississippi Canyon Block 807. Presented at the 2008 SPE Annual Technical Conference and Exhibition, Denver, Colorado, 21–24 September. SPE-115365-MS. https://doi.org/10.2118/115365-MS.

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