Pressure behavior of hydraulically fractured oil wells at and below the bubble-point pressure

Book · Tue Jan 01 04:00:00 EST 1985

OSTI ID:5718710

Wright, J D

Pressure transient analysis is widely used by the oil industry to determine in-situ rock properties, wellbore damage, and apparent fracture length in hydraulically fractured wells. These rock properties are used by engineers to analyze reservoir performance and to predict future production. The mathematical development of pressure transient analysis theory assumes single-phase, constant-compressibility fluids flowing in a radial system. Pressure transient tests of most oil wells do not meet these basic assumptions because the wells usually are hydraulically fractured, resulting in a non-radial flow system, and are in multiphase flow. To investigate multiphase flow in hydraulically fractured wells, a two-phase, two-dimensional, finite-difference reservoir model was written to simulate an oil well. The well was produced below the bubble-point at a constant rate until pseudo-steady state flow conditions occurred in the reservoir. The well was then mathematically shut in and the well bore pressures were calculated during the buildup. These data were analyzed using the Horner method. The correct values for rock properties and fracture lengths can be calculated using the Horner method, provided a correlation factor is applied as shown in this study.

• Research Organization: Colorado School of Mines, Golden (USA)
• OSTI ID: 5718710
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
CALCULATION METHODS
CONTROL
FAILURES
FINITE DIFFERENCE METHOD
FLOW MODELS
FLUID FLOW
FRACTURED RESERVOIRS
FRACTURES
HYDRAULIC FRACTURES
ITERATIVE METHODS
MATHEMATICAL MODELS
MULTIPHASE FLOW
NUMERICAL SOLUTION
OIL WELLS
PERFORMANCE
PRESSURE CONTROL
STEADY FLOW
TESTING
TWO-DIMENSIONAL CALCULATIONS
WELLS