Formation Gas Quantification in the Z-Field Niger Delta Using Multidetector Pulsed Neutron Well Logging Technology
Author:
Akagbosu P.1, Kim Y.2, Adesokan I.3
Affiliation:
1. Baker Hughes, Port Harcourt, Nigeria 2. Baker Hughes, Seongnam, Republic of Korea 3. Matrix Energy Exploration and Production Company, Lagos, Nigeria
Abstract
Abstract
The quest for optimal gas detection and quantification in Niger Delta regions for sustainable energy development necessitates advanced technologies. This paper explores a multidetector pulsed neutron well logging technology with improved formation gas sensitivity for precisely characterizing reservoir fluids and estimating gas saturation in a freshwater environment. This innovative method is applicable to tight porosity and low water salinity formations, which are historically challenging conditions for accurate saturation analysis with conventional pulsed neutron logging applications.
This technology encompasses (1) a pulsed neutron generator that creates high-energy neutrons that interact with formation nuclei and create induced gamma rays and (2) three gamma-ray detectors and an electronics system that records induced gamma rays based on the gamma-ray energy level and arrival time. In addition, forward modeling of tool responses is a critical component. Monte Carlo N-Particle (MCNP) modeling simulates the three-detector pulsed neutron tool’s gas-sensitive log responses. The predicted MCNP models are incorporated into the saturation analysis workflow to identify and quantify the formation gas saturation considering reservoir fluid properties, lithologies, well completions, and cement densities.
A case study demonstrated the use of multidetector pulsed neutron well logging technology for quantitative formation gas evaluations of cased-off reservoirs in the Z-field Niger Delta. This contributes to the use of gas resources for sustainable energy development in Africa.
Reference16 articles.
1. Akagbosu, P., Kim, Y., Nardiello, R., Chace, D., McGlynn, I., Lawal, K., Akomeno, K., Toumelin, C., and Atuanya, C.
2023. Carbon/Oxygen Logging Speed Optimization in the Niger Delta Fields With Improved Pulsed Neutron Technology. Paper presented at theSPE Nigeria Annual International Conference and Exhibition, Lagos, Nigeria, 31 July-2 August. SPE-217241-MS. 2. Gilchrist, A., Prati, E., and Pemper, R.
1999. Introduction of New Through-Tubing Multifunction Pulsed Neutron Instrument. Paper presented at the1999 SPE Annual Technical Conference and Exhibition, Houston, Texas, USA, 3-6 October. SPE-56803-MS. 3. Gray, R., Smith, E., Parsa, A., Kim, Y. and Odusi, G.
2019. Identification of Remaining Reserves Using Pulsed Neutron Logging for Pressure Determination Behind Casing in Mature Gas Condensate Reservoirs. Prepared for presentation at theSPE Annual Technical Conference and Exhibition held in Calgary, Alberta, Canada, 30 September-2 October. SPE-196090-MS. 4. Inanc, F., Gilchrist, W., Ansari, R., and Chace, D.
2009. Physical Basis Modeling, and Interpretation of a New Gas Saturation Measurement for Cased Wells. Paper presented at theSPWLA 50th Annual Logging Symposium, Woodlands, Texas, USA, 21-24 June. SPWLA-2009-42298. 5. Kim, Y., Kotov, A., and Chace, D.
2021. Time-Lapse Pulsed Neutron Well Logging in Oil Sands for Monitoring Steam Chamber Development. Paper presented at the2021 SPE Middle East Oil & Gas Show and Conference, Manama, Bahrain, 28 November-1 December. SPE-204576-MS.
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