P. E. Moseley & Associates are proud to offer THE PREMIUM well performance program, the Well Evaluation Model (WEM). The standard version of WEM addresses most single well applications. For very complex systems consider upgrading to the professional version of WEM (WEMPro). Regardless of which version suits your applications, we stand behind our pledge to keep WEM well ahead of all the others.

WEM: The Solution for Optimizing Well Productivity  WEM Brochure

Well performance analysis (i.e. Nodal Analysis) is based on the principle that one can independently characterize reservoir inflow and wellbore outflow as functions of flow rate. The single rate that balances the pressure losses in the inflow-outflow system defines well flow. Starting from this premise optimizing well productivity has evolved to a process of systematic updating of well parameters and comparing incremental flow rates with the associated cost of the proposed changes.

Applied correctly, well performance technology addresses a wealth of issues pertaining to the design and operation of oil and gas wells. To this end, the Well Evaluation Model (WEM) has integrated the wide variety of engineering technologies necessary to facilitate quick, accurate solutions for virtually any well performance question. While not nearly an exhaustive list, the following represents a few typical questions that can be answered using WEM: What is the optimum economic tubing size considering both current and future well conditions? What is the flowing tubing pressure limit at which lower values lead to damaging the formation, completion or tubing based on the characterization of well deliverability? How can future completion strategies be improved based on post-completion analysis? When actual versus predicted well performance identifies bottlenecks in the well, is the flow impediment associated with formation damage, inadequate perforations or outflow hydraulics? Is the incremental rate derived from a well workover large enough to justify the associated cost? When is installing a velocity string to hydraulically unload liquids in a gas well attractive and what is the effect of string size? Does history-matching production data suggest that a rate decline is associated with cumulative production or adverse well conditions causing an increase in near wellbore skin effect? What is the effect of cumulative production on well performance based on coupling Nodal Analysis with material balance or reservoir simulation? WEM has been utilized extensively in fields all over the world for well design, troubleshooting and monitoring. There are many cases where the use of WEM has resulted in doubling field production without drilling a single well.

WEM: Introducing a Unique Adaptive Interface for Quick, Accurate Solutions

Over twenty of years of actual use in the field have resulted in the expert assembly of a program very easy to apply in practical situations. A WEM well performance model is automatically assembled from a list of installed equipment defined by the user. The array of equipment and options provided in WEM ensures that any producing or injecting system can be constructed. Input data are organized into intuitive groupings for quick and easy access. Extensive user feedback has resulted in an interface that is formatted for easy understanding. Accurate rate predictions are assured when the pressure drop models replicate actual field performance. WEM provides a wide array of automatic tuning features that adjust the well model components to be in compliance with several types of field and laboratory data.

WEM: Modularized to Suit Your Applications