Forecasting long-term gas production of dewatered coal seams and fractured gas shales

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:170085

Spivey, J P; Semmelbeck, M E

Production decline curves are routinely used by engineers to predict the future performance of oil and gas wells. Because the results of decline curve predictions are used for calculating asset value and estimating future revenue, they are one of the most important tools reservoir engineers use. There are numerous variations on the basic exponential or hyperbolic decline analysis method. Fetkovitch and other have extended the decline curve analysis method to handle gas wells properly and to be able to estimate reservoir properties from the analysis of these data. However, there has been considerable drilling activity in the last 10 years into unconventional reservoirs whose wells do not follow the traditional production decline characteristic shapes. Among these problem reservoirs are coalbed methane and fractured shale reservoirs. A procedure is presented which allows forecasting long range performance of dewatered coal and fractured gas shale reservoirs having nonlinear adsorption isotherms, using constant pressure solutions to the flow equation for slightly compressible liquids. A correlation is presented to show the range of applicability of this procedure.

• OSTI ID: 170085
• Report Number(s): CONF-950331--
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
03 NATURAL GAS
COAL SEAMS
DEGASSING
FLOW MODELS
FRACTURED RESERVOIRS
NATURAL GAS WELLS
PRODUCTION
RESERVOIR ROCK