American Oil and Gas Reporter - PBIOS 2014 Official Program Guide - 158

Approach Improves SACROC Recovery
By Mark A. Linroth
and Andrew E. Rickard
HOUSTON-Injected carbon dioxide
seldom sweeps all portions of each injection pattern uniformly in a CO2 enhanced
oil recovery project. This is compounded
by the fact that injection patterns are not
always symmetrical and the injection
well itself may not be centered within the
pattern. Areal sweep within a pattern is further influenced by pressure gradients that

may not be uniform in all directions.
In the SACROC Unit in the Kelly-Snyder Field, the approach to maximizing the
areal sweep involves detailed monitoring
of individual producing well pump intake
pressures and producing gas-to-oil ratios,
as well as the calculated streamlines to
identify opportunities for changing the direction of CO2 migration in the reservoir.
It is observed frequently that response to
CO2 injection occurs in only one well or
only one side of a pattern, with little to no

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effect in the other directions. The remedy
involves converting to flow or slowing the
pump in the responding wells to raise the
pump intake pressure when GOR exceeds a certain threshold, and upsizing or
speeding the pumps in the wells on the opposite side of the pattern.
The effect of these changes is to alter
the pressure distribution within the pattern and change the portion of the reservoir being processed by CO2. Monitoring and altering streamlines is time- and
data-intensive, but in patterns where it is
applicable, significant increases in ultimate recovery can be obtained for essentially no capital cost. In fact, cases have
been documented where pattern recovery
has more than doubled after altering the
streamlines.
With a unitized area of 55,000 acres, the
SACROC Unit is one of the world's
largest and oldest CO2 EOR projects.
Pattern size ranges from 18 to 110 acres.
The Pennsylvanian-age Canyon Reef
reservoir is a clean limestone at depths of
6,300-7,000 feet. Average porosity is 12
percent and average permeability is 30 millidarcies. Formation temperate averages
125 degrees Fahrenheit, and the oil has an
API gravity of 41 degrees with a viscosity of 0.8 centipoise. Initial reservoir
pressure is 3,120 psi, with a minimum miscibility pressure of 1,850 psi and bubblepoint pressure of 1,800 psi. The initial solution GOR is 1,000 cubic feet/barrel.
In an ideal enhanced recovery flood, all
the patterns would be symmetrical, and
other parameters such as pressure, withdrawal rates, permeability and fluid saturations would be constant across each pattern. Within each pattern, the injection into
each interval would be in proportion to the
porosity-thickness for that layer, leading
to a uniform processing rate. In practice,
however, none of these things are uniformly true.
Improving Sweep Efficiency
The focus at SACROC is on improving areal sweep efficiency by managing
bottom-hole producing pressures and
withdrawal rates. For example, not only
does reservoir permeability vary across
each pattern, but the bottom-hole producing pressures also are seldom equal. That
creates varying injector-to-producer pressure gradients, and these problems may be
exacerbated by asymmetry in the patterns
themselves. The result is that the injected
fluid is not distributed uniformly aerially
within the pattern, and one or more pro-



American Oil and Gas Reporter - PBIOS 2014 Official Program Guide

Table of Contents for the Digital Edition of American Oil and Gas Reporter - PBIOS 2014 Official Program Guide

Contents
American Oil and Gas Reporter - PBIOS 2014 Official Program Guide - Cover1
American Oil and Gas Reporter - PBIOS 2014 Official Program Guide - Cover2
American Oil and Gas Reporter - PBIOS 2014 Official Program Guide - 3
American Oil and Gas Reporter - PBIOS 2014 Official Program Guide - Contents
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