Condensate Revaporization Using a Coreflooding Test, a Dynamic Approach to Evaluate Liquid Recovery in a Gas Condensate Reservoir, Case Study Camisea Region
- Jose Miguel Dorival Vargas (Pluspetrol Corporation) | Fabrice Pairoys (Schlumberger Reservoir Laboratories USA)
- Document ID
- Society of Petroleum Engineers
- SPE Latin American and Caribbean Petroleum Engineering Conference, 27-31 July, Virtual
- Publication Date
- Document Type
- Conference Paper
- 2020. Society of Petroleum Engineers
- 0.2 Wellbore Design, 5.4.3 Gas Cycling, 1.6 Drilling Operations, 1.6.9 Coring, Fishing, 5.5.2 Core Analysis, 5.8.8 Gas-condensate reservoirs, 5.4 Improved and Enhanced Recovery, 1.2.3 Rock properties, 5.4.2 Gas Injection Methods, 5 Reservoir Desciption & Dynamics, 5.5 Reservoir Simulation, 5.7 Reserves Evaluation, 5.8 Unconventional and Complex Reservoirs, 4.6 Natural Gas, 4.6 Natural Gas, 5.7.2 Recovery Factors
- camisea, reservoir, coreflooding, gas cycling, Gas Condensate
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Some gas cycling projects are initiated due to a lack of sales markets, which is essentially a disposal project. However, this paper demonstrates the replication of a gas cycling project with similar field operational conditions, in Camisea region, using a coreflooding test. The main objective of the work presented in this paper is to take into consideration the reservoir, the fluid behavior, the operational cycling boundary conditions and monitoring the recovery factor of the liquid fraction using coreflooding to re-vaporize the condensate into the core.
A coreflooding test was carried out to simulate experimentally what the expected performance would be for a gas cycling process in one field at the Camisea region. A full barrel core of the most representative formation in this field was divided into small plugs to determine the rock properties with a CT scanner. Some of those plugs were setting in a stack arrangement to perform a condensate coreflooding program designed according the future operational conditions of the cycling project. A synthetic injection gas was made (90% methane-10% ethane). Furthermore, the current field operational conditions were used as the starting point to generate the assessment at the laboratory, and for that reason, a procedure from the initial to the current reservoir pressure conditions was developed in order to find the maximum liquid drop out. Finally, the effect of the dry gas being injected was observed together with monitoring the evolution of the liquid recovery.
Initial saturation at the core was measured using x-ray spectroscopy, and residual condensate saturation was calculated using the x-ray scanner together with a material balance. After running the two stages of the experiment (1. Equilibrium gas condensate, 2. Dry gas injection) for a constant reservoir pressure in the core, the results were successful with respect to the measurements for this kind of fluid, which is denominated lean gas. The depletion stage shows around of 45% liquid recovery, and the dry gas injection stage an additional 40%. The main conclusion is that the observation of the remaining liquid saturation, by means of monitoring the evolution of revaporization along the core with operational conditions, is similar to the gas cycling project.
Coreflooding tests that were performed prior to the implementation of a gas cycling project helps to significantly reduce the uncertainties over the main target, and the final results, with respect to the operational and economical assessments. The workflow used for this test provides a guideline to generate a best practice and provides a better means to estimate the additional incremental recovery factor rather than being dependent on only estimates from fluid laboratory analysis, or reservoir simulation engineering.
|File Size||1 MB||Number of Pages||12|
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