You are here

Production enrichment solution improves daily oil production by 34% in Eagle Ford shale play well

27th October 2015

A total production enrichment solution that included an electrical submersible pumping (ESP) system and a chemical program increased production in an Eagle Ford shale well by 80 BOPD.

Increased production at Eagle Ford
Increased production at Eagle Ford

It also prevented production system downtime due to issues related to high-gas content and oil composition.

The operator had installed rod-lift systems in three wells that were no longer free flowing, but the systems weren’t effectively drawing down the wells, and production was limited. Fluid levels in the wells remained at 600 to 1,100 ft (183 to 335 m) below the surface.

The wells, which averaged 9,200 ft (2804 m) total vertical depth and 17,000 ft (5187 m) total measured depth, were also experiencing repeated rod-wear failures due to deviated wellbore geometry. Additionally, this area of the Eagle Ford play suffered from severe scale and corrosion issues, which dramatically impacted downhole pumping performance.

To achieve greater drawdown, Baker Hughes engineers recommended the slim-line CENesis PHASE™ multiphase encapsulated ESP system together with a chemical treatment program using a capillary line to prevent scale buildup in the ESP system. The slim-line CENesis PHASE technology is designed to fit wells with smaller casing sizes and to naturally separate the high levels of gas typical in the Eagle Ford play before it can enter the pump and potentially create gas-locking conditions. Based on calculations from the Baker Hughes AutographPC™ sizing and simulation software, free gas in the fluid stream was approximately 85%.

“The CENesis PHASE system was also chosen as the best technical solution due to the low water cuts and high API gravity of the oil in the Eagle Ford play,” says Jehiel Aguilar, artificial lift engineering manager for the Baker Hughes North America region. “This combination causes the oil and gas to foam up instead of cleanly separating and can cause the ESP system motor to overheat. The CENesis PHASE design mitigated this concern by diverting fluid past the motor to keep it cool.”

Because of the known scale and corrosion issues, Baker Hughes scientists analyzed the produced water in the area. Based on the results, the WCW7919 scale and corrosion inhibitor was selected as the most effective chemical treatment and was injected at the pump intake using a capillary line.

“This was a critical part of the solution due to the severe scale and corrosion issues, which can lead to pump inefficiencies and premature failures,” Aguilar says. “Eliminating any scale buildup or corrosion was doubly important in the smaller flow paths of the slim-line ESP system. Delivering the combination inhibitor directly to the intake of the pump helped ensure effective treatment for the internal components in the pump, tubing, and also to the motor where diverted fluid passing by it helped keep it cool and avoid scale build up.”AMBIT™ PLUS 24/7 production surveillance services were also deployed to optimize the operation of the ESP system during the first several weeks when downhole conditions tend to be more erratic.

“Following installation of the Baker Hughes production enrichment solution,” Aguilar says, “the operator immediately measured fluid levels in the well at 3,200 ft [975 m] from surface, which resulted in 80 BOPD incremental production.”

The CENesis PHASE ESP system effectively managed the gas in the fluid stream; data from AMBIT PLUS monitoring services indicated there was no gas interference in the pump; and the operator was able to capture production of 184 Mcf/D—substantially more gas than the three wells on rod lift were producing—providing a secondary revenue stream from the well.

“The ESP-based solution also mitigated the issues related to wellbore deviations, eliminating the downtime and lost production associated with rod wear failures,” Aguilar adds. “Plus, the CENesis PHASE system design alleviated any potential motor heating concerns.”
 
 

 

 

Got a news tip? Email news@oilandgastechnology.net