Don E. Charbula, P.E.
Responsibilities include providing a wide variety of petroleum engineering consulting services to oil and gas companies, gas transmission companies, natural gas and liquids storage companies, banks, trusts and institutional investors.
Texas American Resources Company and Texas American Resources Asia Austin, Texas USA [1999 to April 2008]
Senior Vice President, Engineering and Consulting Petroleum Engineer Provided reservoir engineering support for the domestic and international company. Calculated Reserve and resource volumes utilizing deterministic, probabilistic, material balance, decline curve, and analog methodologies. Supervised and coordinated the activities of two engineers and a technical assistant Prepare technical reports, information memoranda, and presentations for potential equity investors, senior lenders, and prospective partners. Prepared Reserve reports and annual budget for the company. Negotiated with engineering consultants and bank representatives to maximize the value of company assets. Evaluated acquisition and divestiture candidates. Provided expert testimony before the Texas Railroad Commission. Serve as an officer of company.
Tri-Union Development Corporation Houston, Texas USA [1998 to 1999]
Manager, Reservoir Engineering Directed the group that provided reservoir engineering services for the company. Areas of responsibility included the Gulf of Mexico, onshore Texas, and California’s Sacramento Basin. Calculated reserves utilizing volumetric, material balance, decline curve and analog methods. Maintained company’s Reserve system and documentation. Prepared reports as required by senior lenders. Evaluated potential acquisition and divestiture candidates.
Rutherford-Moran Oil Corporation Houston, Texas USA [1996 to 1998]
Manager, Reservoir Engineering Established an engineering department by setting technical standards, organizing and recording technical data in a database. Initiated a methodology and means for forecasting and tracking production, Reserves, operating expenses and cash flows. Provided all reservoir and production engineering support for company’s leasehold in the Gulf of Thailand. Determined net proved reserves of 358 Bcfe (878 Bcfe gross) in the multi-reservoir Tantawan, Benchamas and Maliwan fields. Established criteria for well completions and recommended revised drilling procedures resulting in a 35% cost savings. Prepared reports and presentations for the company’s board of directors, banks, bond rating agencies, equity investors, equity analysts, and other outside constituents. Actively participated in the company’s successful initial public offering on the NASDAQ. Prepared various public filings, including prospectuses, bank agreements, Form 10-K filings, annual reports and press releases.
Columbia Gas Development Corporation Houston, Texas USA [1992 to 1995]
Staff Engineer/Reserves Coordinator Provided reservoir engineering support for the multi-disciplined offshore asset management team. Group was responsible for operated and non-operated properties with a net value of $106 MM – roughly 56% of the total company value. Implemented material balance techniques, volumetric estimates, and decline curve analyses to increase net proved reserves by 41.5 Bcf and 794 MBbls over a 12-month period. Administered an ORACLE-based Reserve management system. Coordinated reserve reporting activities of engineers from four asset management teams. Acted as liaison with internal and external auditors. Worked closely with earth scientists to generate and evaluate proposals to drill development and exploratory wells. Prepared field studies integrating reservoir performance with geological and geophysical data. Analyzed potential acquisitions and presented results to executive management.
Maxus Energy (Diamond Shamrock) Dallas, Texas USA [1989 to 1991]
Senior Operations Engineer Responsible for engineering aspects of operated properties in Texas and Louisiana state waters. Total rate from these areas represented 80% of the division’s total rate from operated wells. Designed, recommended and implemented a workover program that increased production from Grand Isle 24 from 1.6 MMcf to 10 MMcf per day. Program added approximately 12 Bcf in proven Reserves. Prepared, recommended and executed plan to drill division’s first horizontal well. Project was located in the Olmos “B” Unit in Frio County, Texas.
Maxus Energy (Diamond Shamrock) Dallas, Texas USA 
Hydrocarbon Marketing Representative Negotiated spot and term sales of natural gas to marketing companies and end users. Avoided curtailments that would have resulted in the loss of as much as $1.2 million per month through negotiations with gas transmission company.
Maxus Energy (Diamond Shamrock) Houston, Texas USA [1982 to 1988]
Petroleum Engineer Provided Reserve estimates for new properties and potential acquisitions. Maintained Reserve documentation for assets in areas of responsibility. Prepared detailed Reserve studies with recommendations to exploit un-drained Reserves through workovers and/or drilling.
Maxus Energy (Diamond Shamrock) Pampa, Texas USA 
Production Engineer Provided field engineering support for several mid-continent area fields. Designed and assisted in the supervision of remedial workover and stimulation procedures.
Registered Professional Engineer (Texas No. 73435)
Society of Petroleum Engineers
Solution Mining Research Institute