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All Journal Scientific Contributions Oil and Gas
Edward ML. Tobing
Research and Development Centre for Oil and Gas Technology "LEMIGAS"
Chemical Engineering, Chemistry & Bioengineering Energy

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CHANGING WELLBORE STORAGE IN GAS WELL TESTING Edward ML. Tobing
Scientific Contributions Oil and Gas Vol 31 No 2 (2008)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.31.2.1008

Abstract

Extended wellbore storage can be mistakenly interpreted as a reservoir response in gas well testing with surface shut in. This interpretation usually results in false value for permeability, skin and reservoir size and shape. This paper investigates changing wellbore storage in pressure transient testing with surface shut-in in gas well. This study was prompted by the observation, that in gas wells, many of the buildup tests obtained with surface shut-in exhibited complex reservoir model behavior with relatively low skin. The results presented in this paper are based on well test simulation and field data from North Sumatera. This work demonstrates the effect changing wellbore storage on the pressure derivative curve. Knowledge of the expected pressure derivative shape, and duration, will improve the design of buildup tests that will allow enough time for the actual reservoir response to be observed. This will result in a reliable reservoir model and correct estimation of permeability and skin factor.
A SINGLE PHASE MODEL FOR ANALYZING GAS PIPELINE NETWORKS Edward ML. Tobing
Scientific Contributions Oil and Gas Vol 31 No 3 (2008)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.31.3.1010

Abstract

A single phase flow model has been developed for gas distribution pipeline networks. The model is developed based on looped-system approach with some modifications. In this model, a equation of state model is implemented for predicting the gas properties required for the governing equations of the network system. By utilizing the Linear Theory Method, the Panhandle’s single phase gas flow model is implemented in this model to predict the hydrodynamic variables in each leg of the network using the iterative technique which is developed in this study. A generalization of the single phase network model is provided thereby making it possible for the single flow model used to be replaced by another one that may be more applicable for a particular situation. Using the iterative procedure developed, pressure at all nodes, gas flow rate at each leg can be predicted. The test results demonstrate that the model can serve as a predictive and design tool for solving a single phase gas flow problem in pipeline network.
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