Formation Pressure Evaluation for Producing Wells Without Shutting Down the Well, Using Triple Spectral Noise Logging TSNL
- Arlen Sarsekov (ADMA-OPCO) | Ahmed Al Neaimi (ADMA-OPCO) | Abdulla Abed (ADMA-OPCO) | Mohamed Saber (ADMA-OPCO) | Fazeel Akram (ADMA-OPCO) | Arthur Aslanyan (TGT Oilfield Services) | Irina Aslanyan (TGT Oilfield Services) | Nail Galin (TGT Oilfield Services) | Ruslan Makhiyanov (TGT Oilfield Services) | Rushana Farakhova (Sofoil)
- Document ID
- Society of Petroleum Engineers
- Abu Dhabi International Petroleum Exhibition & Conference, 7-10 November, Abu Dhabi, UAE
- Publication Date
- Document Type
- Conference Paper
- 2016. Society of Petroleum Engineers
- 5.8 Unconventional and Complex Reservoirs, 5 Reservoir Desciption & Dynamics, 5.8.7 Carbonate Reservoir
- Non standart completion, Sublayers, Formation Pressure, sliding sleeve, Spectral Noise
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Most oil and gas fields in the UAE are mature multi-layer carbonate reservoirs with vertical heterogeneity that complicates their development. Because of this heterogeneity, hydrodynamically isolated reservoir units tend to develop different formation pressures during production, which results in wellbore and behind-casing cross-flows reducing production performance. The conventional sub-layer formation pressure measurement method employs wireline formation testers (MDT) in some wells before putting them into production. Once a well is completed and put on stream, determining the sub-layer formation pressure becomes problematic, and the wellbore pressure recorded during SGS or PTA, being the only measurable parameter related to the weighted average pressure for all layers, cannot help to determine the pressure of each individual layer.
This paper describes a new method for formation pressure evaluation – Triple-rate Spectral Noise Logging (TSNL) – and presents case studies from an offshore carbonate field in the UAE.
The physics of this method is based on the fact that formation flow noise depends on the pressure drawdown and therefore contains information on formation pressure in each layer.
Once a spectral noise log is recorded across all layers at three flow rates and filtered of non-formation noise, formation pressure in each layer can be estimated through numerical pressure-noise simulations using the PolyGon software.
The key feature of the method is that it allows the measurement of formation pressure by layer in producing wells without deferring production. As a result, wells can be operated without early free gas release or water breakthrough, which prolongs their life and facilitates the future development of the field.
The determined layer formation pressure has been compared with MDT measurements from a newly drilled infill well. TSNL-based predictions of formation pressure for all layers turned out to be only several psi different from the MDT measurements. The SNL tool has outer diameter of 1 11/16 and can go through the most tubings. It allows TSNL to assess formation pressure behind the multiple metallic barriers - for example through tubing and two casings.
TSNL can greatly facilitate gas and water production management in cases of uneven depletion of multi-layer formations. It enables timely actions to be taken to shut off gas or water, which reduces the cost of conventional pressure measurements and prevents production deferment occurring during shut-in periods of pressure stabilisation for the conventional SGS and PTA surveys.
|File Size||775 KB||Number of Pages||11|
Asfandiar Mehdi Ansari, Yahia I. Mahmoud. https://www.onepetro.org/search?q=affiliation%3A%28%22RasGas+Co.+Ltd.%22%29 Multi-Layer Testing: Theory and Practice. 2009. IPTC-13546-MS
Nelson Suarez, Ademola Otubaga, Nagendra Mehrotra, Arthur Aslanyan, Irina Aslanyan, Murat Khabibullin, Jamal Barghouti and Yulia Maslenikova. 2013. Complementing Production Logging with Spectral Noise Analysis to Improve Reservoir Characterisation and Surveillance. SPWLA 54th Annual Symposium, New Orleans, Lousiana, USA.