Well data for oil and gas wells drilled in the Western Canadian Sedimentary Basin (WCSB) exist in many places and multiple formats with ranging detail. Multiple data sources, both internal and external, are needed to optimize the well stimulation and the production optimization process. Public production and well data in the WCSB is considered high in quantity and quality for reservoir description. This data repository exists due to royalty and tax reasons and is strictly enforced by government legislation. Unfortunately, detailed completion data are not part of the public database records. However, companies whose core business include drilling and completion field services usually keep a comprehensive and detailed collection of data. These pumping service companies often have data that are unavailable in the public databases.
This paper outlines the first steps in developing a synergistic approach to integrating publicly available production and well data with detailed completion data from private sources. The case study presented shows the effectiveness of combining internal detailed completion data with external third party data.
Case study #1 evaluates various fracture fluid systems and size on production in the Medicine Hat gas of southeast Alberta, Canada. Case study #2 evaluates stimulations in the Horseshoe Canyon Coal Bed Methane (CBM), fairway in south central Alberta, Canada. Production impact of current industry stimulation practise and some alternatives are examined.
There are various sources of information regarding oil and gas activity in the WCSB. Operators, government bodies, data vendors and service companies all collect information. The formats vary from paper to electronic and from organized databases to scattered documents.
Information on a large scale is most valuable when combined with related information from different sources. A common point of reference such as the Public Petroleum Data Model (PPDM) implemented in a powerful relational database creates this value when different data sources are mapped into it.
Data will typically exist on several different platforms. Highly structured data stored in relational databases such as Oracle, Microsoft SQL Server, or even Microsoft Access is easy to work with. Semi-structured data is found in Lotus Notes and Microsoft Exchange. While having the advantage of being centrally administered like a database, it is often more difficult to work with due to the flexible nature of the underlying technologies.
Finally, the huge collection of documents is in electronic and paper form and created over many decades are on various hardware platforms from mainframe to handheld. The apparently endless variety of layouts and file formats in word processors, spreadsheets, and specialized engineering applications are the most difficult to work with, but often are also the most rewarding. After all, these reports were usually interpreted by engineers investing time and energy before committing their conclusions to paper.
Several vendors offer a variety of local data installations or Internet data hubs. Their data may be either hand entered from original source documents but most of the time are received on tape from government boards. Information varies widely since there are so many datasets and sources to choose from. Some types of datasets available sre:
raster well logs
LAS well logs
casing depth and specifications
well test summaries
well test PAS files