Comparison of methods for determining in-situ leakoff rate based on analysis with an on-site computer

Conference · Sat Sep 01 04:00:00 EDT 1984 · Soc. Pet. Eng. AIME, Pap.; (United States)

OSTI ID:6172176

Cooper, G D; Nelson, S G; Schupper, M D

Two methods for determining a rate of fluid loss during a fracturing treatment have been proposed. In each method, the basis for determination of the in situ leakoff rate is the downhole pressure behavior after initiating a small fracture in the zone of interest. The first method, by Nolte, utilizes a master curve fit of data derived from the pressure decline following a fracturing treatment. The second method, by Nierode, relates two or more instantaneous shut-in pressures (ISIP's) as hydraulic fracturing progresses. Nierode then calculates from the pressure changes a rate of fluid loss. This paper discusses the analysis of downhole pressure behavior using both techniques, and direct comparisons of results are made. These studies were conducted throughout the North American continent using an on-site computer. Furthermore, limitations rarely encountered for both the Nolte and Nierode analyses are discussed. The main limitations are establishing heights for the Nolte in situ leakoff analysis and increasing pressures during the Nolte pressure decline phase. For the Nierode technique, the main limitation has been initial ISIP's higher than the final ISIP. Combined leakoff values determined from laboratory tests and reservoir information are compared to in situ leakoff rate determinations. Specific emphasis is placed on determining the effects of natural fractures, fracture heights, and permeability on these fluid loss techniques.

• Research Organization: BJ-Hughes Services Inc.
• OSTI ID: 6172176
• Report Number(s): CONF-8409104-
• Conference Information: Journal Name: Soc. Pet. Eng. AIME, Pap.; (United States) Journal Volume: SPE13223
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030900 -- Natural Gas-- Artificial Stimulation
Plowshare-- (-1989)
COMMINUTION
COMPUTER CALCULATIONS
CRACK PROPAGATION
ENHANCED RECOVERY
FLUID MECHANICS
FLUIDS
FRACTURING
FRACTURING FLUIDS
HYDRAULIC FRACTURING
LOSSES
MECHANICS
NATURAL GAS WELLS
OIL WELLS
PERMEABILITY
PRESSURE MEASUREMENT
RECOVERY
WELL LOGGING
WELLS