Effects of stress sensitive permeability and fracture fluid leakoff on transient well tests of fractured gas wells

Conference · Sat Oct 01 00:00:00 EDT 1983 · Soc. Pet. Eng. AIME, Pap.; (United States)

OSTI ID:5358326

Brockenbrough, J R; Culham, W E

The influence of two mechanisms of permeability alteration and their effect on transient well test response are investigated. First, formation permeability reduction with increasing overburden stress in low permeability gas reservoirs is examined. It is found that analysis using conventional gas pseudo pressure can lead to substantial error in fracture length estimates. A permeability dependent pseudo pressure function is defined which improves parameter estimation in stress sensitive formations. Second, the effect of near-fracture liquid accumulation resulting from fracture fluid leak-off on transient well test response in a low permeability gas reservoir is investigated. It is shown that the effect of liquid accumulation resulting from leak-off is to create a skin around the fracture which reduces the permeability of the formation to gas. This skin can obscure well test interpretation on a log of pressure versus log of time graph but data can still be analyzed with the appropriate pressure versus power time graphs.

• Research Organization: Gulf R. and D. Co.
• OSTI ID: 5358326
• Report Number(s): CONF-8310121-
• Journal Information: Soc. Pet. Eng. AIME, Pap.; (United States), Journal Name: Soc. Pet. Eng. AIME, Pap.; (United States) Vol. SPE12132; ISSN SEAPA
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
030200* -- Natural Gas-- Reserves
Geology
& Exploration
COMMINUTION
DATA ANALYSIS
DATA COVARIANCES
FAILURES
FLUIDS
FRACTURED RESERVOIRS
FRACTURES
FRACTURING
FRACTURING FLUIDS
HYDRAULIC CONDUCTIVITY
HYDRAULIC FRACTURES
HYDRAULIC FRACTURING
NATURAL GAS WELLS
PERMEABILITY
RESERVOIR FLUIDS
RESERVOIR PRESSURE
RESERVOIR ROCK
ROCK-FLUID INTERACTIONS
STRESS ANALYSIS
STRESSES
TRANSIENTS
WELL LOGGING
WELL PRESSURE
WELLS