Analyzing Reservoir Fluid Composition In-Situ in Real Time: Case Study in a Carbonate Reservoir (2003)

Analyzing Reservoir Fluid Composition In-Situ in Real Time: Case Study in a Carbonate Reservoir Fujisawa Go; Fujisawa Go Schlumberger-Doll Research Search for other works by this author on: This Site Google Scholar Oliver C. Mullins; Oliver C. Mullins Schlumberger-Doll Research Search for other works by this author on: This Site Google Scholar Chengli Dong; Chengli Dong Schlumberger Sugar Land Product Center Search for other works by this author on: This Site Google Scholar Andrew Carnegie; Andrew Carnegie Schlumberger Search for other works by this author on: This Site Google Scholar Soraya S. Betancourt; Soraya S. Betancourt Schlumberger-Doll Research Search for other works by this author on: This Site Google Scholar Toru Terabayashi; Toru Terabayashi Schlumberger K. K. Search for other works by this author on: This Site Google Scholar Satoko Yoshida; Satoko Yoshida Schlumberger K. K. Search for other works by this author on: This Site Google Scholar Antonio R. Jaramillo; Antonio R. Jaramillo Abu Dhabi Company for Onshore Oil Operations ADCO Search for other works by this author on: This Site Google Scholar Mostafa Haggag Mostafa Haggag Abu Dhabi Company for Onshore Oil Operations ADCO Search for other works by this author on: This Site Google Scholar Paper presented at the SPE Annual Technical Conference and Exhibition, Denver, Colorado, October 2003. Paper Number: SPE-84092-MS https://doi.org/10.2118/84092-MS Published: October 05 2003 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Get Permissions Search Site Citation Go, Fujisawa, Mullins, Oliver C., Dong, Chengli, Carnegie, Andrew, Betancourt, Soraya S., Terabayashi, Toru, Yoshida, Satoko, Jaramillo, Antonio R., and Mostafa Haggag. "Analyzing Reservoir Fluid Composition In-Situ in Real Time: Case Study in a Carbonate Reservoir." Paper presented at the SPE Annual Technical Conference and Exhibition, Denver, Colorado, October 2003. doi: https://doi.org/10.2118/84092-MS Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentAll ProceedingsSociety of Petroleum Engineers (SPE)SPE Annual Technical Conference and Exhibition Search Advanced Search AbstractNear-infrared (NIR) spectroscopy is used to provide in-situ quantitative characterization of reservoir fluids during wireline sampling using five representative composition groupings (C1, C2-C5, C6+, CO2, and water). This information is vital for the proper execution of wireline fluid sampling jobs. Time variances of fluid compositions, along with absolute compositions, give us important clues about the phase and contamination level of the capturing samples in real time. In addition, quantitative compositional analysis during wireline sampling provides immediate identification of the critical fluid issues, thereby enabling optimization of the sample acquisition program. Laboratory pressure-volume-temperature (PVT) analysis requires samples that are captured in single phase and are relatively free from mud filtrate contamination. Such information is essential for reservoir management and flow simulation modeling.This paper consists of three parts. The first part covers laboratory NIR spectroscopic study of petroleum fluids at elevated pressures and temperatures. This extensive database, coupled with principal components regression (PCR) technique, establishes the feasibility of such an in-situ compositional analysis.The second part reports shop test results on a downhole experimental prototype. The tool estimates density for each composition group for more than 10 live fluids at conditions simulating a petroleum reservoir. Typically, the measured mass fraction for each composition group agrees with the mass fraction acquired from PVT analysis within ±5% accuracy.The final part presents a field test case study conducted in an onshore carbonate reservoir in the United Arab Emirates (UAE). A gas injection pilot has been running for years, and a comprehensive monitoring program is in place. The first field trial of the subject technology in an observation well successfully identified the presence of injected gas, as determined by fluid compositions. This result was later found to be in good agreement with laboratory PVT analysis.IntroductionThe accurate description of reservoir fluids is essential for successful reservoir evaluation and development because fluid properties influence almost every aspect of production, including economic value, completion design, and production protocol. There is no substitute for acquisition of valid representative reservoir fluids from the formation for proper analysis.The most serious concern associated with wireline fluid sampling is validity of sampled fluid. Wireline samples can contain unacceptably high concentrations of water-base mud (WBM) filtrate or oil-base mud (OBM) filtrate. An equally serious issue is phase transition of fluid caused by pressure drawdown or temperature change, particularly for phase-sensitive fluid such as condensates. Both high filtrate contamination and phase transition invalidate the sampled fluid for any succeeding laboratory analyses. In order to solve these issues, the E&P industry has developed various in-situ techniques to detect these problematic situations while sampling is taking place. Optical fluid analysis is the most accepted technology for fluid discrimination. Water and oil are discriminated using differences in NIR absorption peaks.1 Miscible OBM filtrate contamination in crude oil is analyzed utilizing the time evolution of the visible-NIR spectra during wireline sample acquisition.2,3 Keywords: prototype tool, spectroscopy, drilling fluids and materials, composition group, correct concentration, reservoir fluid, carbonate reservoir, log analysis, drilling fluid selection and formulation, real time system Subjects: Drilling Fluids and Materials, Fluid Characterization, Formation Evaluation & Management, Drilling fluid selection and formulation (chemistry, properties), Phase behavior and PVT measurements, Fluid modeling, equations of state, Open hole/cased hole log analysis This content is only available via PDF. 2003. Society of Petroleum Engineers You can access this article if you purchase or spend a download.