Queenston Formation Completion Design Study-West Auburn Field, New York
In 1988, an extensive completion design study of the Queenston Formation near Auburn, New York, was conducted by Meridian Exploration Corporation, as operator of the ongoing West Auburn and Waterloo field developments. This study was initiated as a result of the subnormal production response of several wells completed in 1987 which have normal geologic characteristics.
This report describes the chronology of the testing program which results in the change from a limited - entry technique, which also had been widely used by other operators in the area, to a staged completion technique.
The overall completion cost changes very little in comparison to the prior design. Six months production history indicates that fracture performance has improved significantly.
A number of technical tests were conducted in order to accurately define certain reservoir and fracture characteristics. This testing was expected to pinpoint and resolve suspected problem areas (such as unrestricted fracture height growth) in the Completion design.
These tests are as follows:
Microfracture - measure in-situ formation stress profile
Minifracture - determine fluid loss characteristics critical to fracture design.
Sidewall Core Analysis - determine mineral content and fluid sensitivities.
Water Analysis - determine compatibility with fracturing fluids; iron precipitation and scaling tendencies.
Bottom Hole Pressure Build-Up - determine reservoir parameters related to production in order to estimate expected production vs. fracture length.
Rock Mechanical Properties Log - correlate stress profile with microfrac for potential use in continuing field extensions.
Radioactive Tracer Log - measure actual fracture height after completion.
These studies resulted in a number of changes in the completion design, the most notable of which are the staging of some completions using one or two baffles and/or perforation balls, the reduction in treatment rate (and subsequently treatment pressures) from 35 BPM to 15 BPM and a substantial reduction in nitrogen volume.