Schlumberger

Case Study: ACTive OptiFIRE System Saves 36 Hours for ENI by Combining Plug Setting and Perforating

New technology sets Copperhead plugs and fires perforating guns with just one coiled tubing run, saving USD 600,000 in rig time, Congo

Challenge: Improve time and fluid efficiency in multistage plug-and-perf completions.

Solution: Combine Copperhead drillable bridge and frac plugs with perforating guns on a single bottomhole assembly, and selectively activate each device using a purpose-built adapter for the ACTive OptiFIRE CT real-time selective perforating and activation system.

Result:

  • Eliminated two coiled tubing runs into the well, saving 36 hours and USD 600,000 of rig time.
  • Immediately verified plug setting and perforation detonation, expediting stimulation operations.
  • Reduced operation costs, logistics, and time by eliminating 23.8 m3 [150 bbl] of brine to pump down the plugs.
  • Achieved production target of approximately 476.9 m3/d [3,000 bbl/d].

Offshore multistage stimulation needs an efficiency boost

The Nene Marine field is a shallow-water sandstone development about 20 km [12 miles] off the coast of Pointe-Noire, Congo. ENI initially developed the field in 2016 by running plugs, perforating guns, fracturing operations, and cleaning out the well in sequential operations through a fracturing string before running the permanent completions.

In the first horizontal well, a Schlumberger team ran Copperhead plugs on coiled tubing (CT) and set each plug by dropping a ball and pumping fluid to achieve the setting pressure. The team then perforated the stage using the ACTive OptiFIRE system, which enabled the crew to run the perforating guns into the horizontal well, detonate the guns without pumping, and immediately confirm detonation. The team then pumped the fracture stimulation designed for the tight sand formation. Finally, CT removed sand and debris to prepare the well for the next plug. Although the ACTive OptiFIRE system improved perforating efficiency, the operation still required three CT runs for each stimulation stage.

To simplify, expedite, and optimize the completion operation, ENI asked for a way to combine more operations.

Downhole tools modified to add capabilities

The ACTive OptiFIRE system can perforate up to 10 zones in a single run and provide real-time downhole detonation confirmation. Because the ENI well design did not use the system's full 10-zone capability for selective perforating, Schlumberger engineered an adapter that enabled the system to set the versatile Copperhead plugs electrically using the conventional wireline plug setting tool.

The new technology was developed rapidly in response to the customer need but was tested thoroughly before deployment to verify functionality and performance. After multiple yard tests and system integration tests with all components, the tools were delivered to the wellsite.

Plug set and perforations fired in one run

For the first zone, the ACTive OptiFIRE system was used without a plug to perforate the zone. After that zone was stimulated, the system was run into the well with an 18-m [59-ft] bottomhole assembly comprising the Copperhead plug and setting tool, optimized 3 1/8-in perforating guns, and a casing collar locator.

Upon reaching the plug depth, the system set the plug, gave immediate surface confirmation of successful setting, and automatically disengaged from the plug.

The CT was then pulled uphole, and the crew used the casing collar locator to precisely place the perforating guns. Before the guns were fired, the crew used the ACTive system's real-time pressure monitoring capabilities during the pressure test to verify the plug's zonal integrity. The guns were then fired and immediately verified detonation so the CT could be pulled out of the well for the fracture stimulation operations. The process was then repeated as designed for one more zone. This efficient process eliminated two coiled tubing runs into the well, saving 36 hours and USD 600,000 of rig time.

The well met production targets with approximately 476.9 m3/d [3,000 bbl/d]. Subsequent production logging determined that all zones were contributing to production, demonstrating the success of the completion and stimulation project.


Download: ACTive OptiFIRE System Saves 36 Hours for ENI by Combining Plug Setting and Perforating (0.34 MB PDF)

Related services and products

 
 
Request More Information

Real-Time Data Verifies Operation Performance

ACTive OptiFIRE System Saves 36 Hours for ENI by Combining Plug Setting and Perforating
PrevNextZoom1 of 1

Precise Downhole Depth and Hydrostatic Pressure Control

ACTive OptiFIRE CT Real-Time Selective Perforating and Activation System
Deployed with the ACTive Perf service, the ACTive OptiFIRE perforating and activation system's perforating guns can be activated up to ten times in a single run. Visit ACTive Perf Service page

Eliminate Presetting, Withstand Pressures to
10,000 psi

Drillable bridge and flow-through frac plug
The Copperhead drillable bridge and frac plug has a solid core that allows it to hold pressure from both directions. Visit Copperhead Plug page