American Oil and Gas Reporter - June 2016 - 53

SpecialReport: Permian Basin Update

WHEN THE

FIGURE 2
Pressure Buildup Data used to Compare Performance
From Flowback Strategy Field Trial
Aggressive Drawdown

Conservative Drawdown

Well #1

Well #2
No Skin
Skin
Damage

P

P'
Pressure

P

Pressure

is far greater than the minor cost of deployment.
The example in Figure 2 shows how
measured BHP can be used to identify
root causes of well underperformance by
analyzing pressure buildup during unexpected shut-ins associated with operational
issues. The two gas-lifted horizontal wells
had similar geology, drilling practices,
landing intervals, and completion designs,
but were flowed differently to test the
impacts of managed drawdown.
Well No. 1 was flowed aggressively
with no drawdown management, while
well No. 2 was flowed conservatively
through the extended use of chokes. Interestingly, the well with more drawdown
not only had a higher rate, but also higher
productivity, which was opposite of what
had been observed in several other shale
plays.
Because of operational issues, both
wells were shut in and BHP was monitored
during extended pressure buildups. Loglog plots of pressure and pressure derivative versus time revealed that well No.
2 (with managed drawdown) had inter-

Time

P'

Time

preted skin damage, as indicated by the
increased separation between the pressure
and pressure derivative curves, compared
with well No. 1.
While this was one of several key
field trials that supported a flowback
strategy decision for all future wells, it

also demonstrated the applicability of
using real-time BHP monitoring to identify
near-wellbore damage during shut-ins.
Well Spacing And Stacking
The Wolfcamp Shale, along with the
overlying Spraberry, provides multiple

ON
DP 2000 DOUBLE FLUID PUMPER
Made to provide the high-volumes
and high-pressures for well
treatments.

500K TOP HEAD DRIVE DRILLING RIG
Designed for a 2-3 man crew with the most efficient,
safe and easy-to-operate features in the industry.

GEFCO an Astec Industries Company
2215 S. VAN BUREN - ENID, OK 73703 USA - 800.759.7441 - 580.234.4141 - gefco.com

JUNE 2016 53



American Oil and Gas Reporter - June 2016

Table of Contents for the Digital Edition of American Oil and Gas Reporter - June 2016

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American Oil and Gas Reporter - June 2016 - Cover2
American Oil and Gas Reporter - June 2016 - Contents
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