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GASMOD & GCOMP Simulators

Introduction

With the acquisition of the GASMOD and GCOMP simulators, Virtual Materials Group can now offer comprehensive, cost-effective software simulation solutions from the reservoir all the way to the processing facilities. GASMOD is a fully integrated single-phase reservoir/multi-phase pipeline simulator with demonstrated capabilities of modeling large complex networks of thousands of wells. GCOMP is a multi-phase reservoir simulator that can be run together with GASMOD. With over 20 years of successful usage, the range of applications for these products is quite varied. Anywhere from gathering networks, field forecasting, shale, tight gas, gas storage and even pipeline integrity management. In this article we explore the history and evolution of these products and their applications. 

Dr. Peter Holst, following his experience as manager of Scientific Software of Canada Ltd, founded PHH Engineering Ltd. (PHH-E) in 1977. Dr. Norman Mani of PHH-E developed GASMOD as a numerical gas reservoir model in the late 1970’s in support of a consulting study. In 1979, PHH-E obtained two major fixed-price contracts from Occidental of Libya that required simulation. The first project was probably the world’s largest miscible flood, while the other was a very large water flood. Both projects had wells that produced up to 80,000 BOPD. They planned to deliver the projects using a 3rd party reservoir simulator but it was later found that the software was very unstable and could not be made to work satisfactorily under those conditions. Fixed price contracts, high super-computer costs and a simulator that did not work created a situation that demanded creativity, good engineering and hard work.

The challenge was met with the creation of GCOMP. The reservoir simulator was formulated as a fully compositional model and combined with the core GASMOD architecture it provided PHH-E with the perfect platform to be successful in these and many more projects. This numerically stable in-house simulator could be tweaked for project specific conditions allowing PHH-E to compete with much larger companies, and many large Libyan projects followed.

In the mid-1980’s PHH-E considered investing into the commercialization of this already-successful software but after careful deliberation, the choice to remain focused on consulting was made. Development of GCOMP then continued to be driven by large-scale projects such as those from Libya. The program grew rapidly and its capabilities now include support for unstructured grids, local grid refinement, chemical (ASP) flooding, links to 3rd party data and a powerful graphical user interface.

Meanwhile, GASMOD development was driven by the needs of domestic clients to solve applications that could not be solved by others. It started with Encana and the Suffield shallow gas project. The project had thousands of wells with numerous processing plants. Flow splitting had posed insurmountable difficulties for other simulators at the time. Success with that project led to many additional shallow gas projects with up to 2,500 existing wells covering 1,600 square miles. It led to gas storage applications with multiple reservoirs and up to 1 BCF/D peak production rates. Focus later changed to shale/tight gas projects and pipeline integrity management (PIM). The use of geo-referenced input data combined with the inherent stability of the network solver has allowed users to assess the risk of failure in 10,000+ pipelines in a period of less than 2 years.

Starting out as a single-phase, single-component gas reservoir model in the late 1970’s, GASMOD has had a lengthy development history. Now, GASMOD is much more than a gas model.  Powered with a state of the art geo-referenced mapping system, GASMOD is a multi-phase, multi component nodal analysis network solver linked to a single-phase reservoir simulator. If and when the need arises, a multi-phase simulator can replace the existing simulator by linking in GCOMP.

GASMOD and GCOMP are commercially available programs and 2016 marks a new chapter in their already long history as part of the VMG suite of applications.

Contact your local VMG office for more information.

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