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ProTechnics interwell tracer tests are
used to confirm a field's directional heterogeneity or flow paths.
From these tracer studies, reservoir and production engineers can
then make informed decisions about field recovery improvements for
waterflood and enhanced recovery projects.
SpectraFlood™ Tracers
ProTechnics can design, inject, and
analyze your interwell flood tracing program to identify injection
flow patterns, pinpoint fluid breakthrough paths, locate thief zones
due to channeling and fractures as well as evaluate the
effectiveness or aid in the design of conformance control
measures. Primary SpectraFlood Applications:
- Identify directional heterogeneity
- Evaluate Sweep p Efficiency and EUR
- Identify multiple porosity permeability systems
and their respective fractional volumes
- Gather design parameters during a pilot
flood
- Evaluate the need for and design parameter for
conformance control
- Evaluate early water breakthrough Improve
design for anticipated tertiary recover projects
This field example illustrates the information
that can be obtained from an interwell tracer test.
The unit concerned had shown poor response to
water injection with little oil response and high water cut. Some of the
high water cut wells were distant from injection wells. Tracers were
thiocyanate ion, radioactive cobalt, and tritiated water.
The response of individual production wells is
shown. Breakthrough time was as short as 4 days and produced tracer
concentrations were high. While tritiated water injected at well 11 showed
at well 9 in 4 days, it is significant that wells 8 and 12 did not show
tracer even as long as 18 months after tracer injection. Tracer appears in
wells that are closely aligned in an ENE direction to the original tracer
injection points. The rapid breakthrough, high produced concentration, and
rapid decline in tracer level point to closely aligned fractures as the
most probable explanation for the tracer behavior. Tracer appeared quickly
to the east of tracer injection wells but only very slowly to the west.
Aligned fractures are not expected to terminate at the injection well. The
strong eastward flow then suggests a pressure gradient across the
reservoir with continuing loss of injecting fluid in an easterly
direction. Changes in the injection pattern plus control of water loss to
the east are suggested as methods to improve flood
response. | 
