StackFRAC® Slimhole System

Re-Stimulation and Well Recovery

The Packers Plus StackFRAC HD Slimhole system is specially designed with a smaller liner outside diameter (OD), enabling operators to re-enter vertical or horizontal wells. This system provides a cost-effective solution for restimulation and well recovery applications.

The Slimhole system was developed with the same features and efficiencies as the Packers Plus StackFRAC HD multi-stage completion system. This innovative system allows for exact placement of stimulation treatments in one continuous pumping operation, saving operators time and money.

The StackFRAC Slimhole system offers many features and benefits

Increase production from previously produced reservoirs

Continuous rigless pumping operation reduces completion time and cost

Custom stimulation for each stage of a previously completed wellbore

Reduce dependency on integrity of existing casing

StackFRAC Slimhole

Learn about how to re-fracture and re-enter existing wells with the StackFRAC Slimhole system


See what the StackFRAC Slimhole system is made of

FracPORT H2 Sleeve

The FracPORT H2 sleeve is a ball-actuated, hydraulically activated injection/production port. This sleeve is run between two RockSEAL H2 packers to allow specific zones of the wellbore to be isolated and selectively stimulated. By providing a flow area greater than the liner, the FracPORT H2 sleeve provides unrestricted flow for stimulation treatments. The FracPORT H2 sleeve is also available in a Drillable Closeable (DC) version that can be closed or re-opened for future operations. This allows for effective water or gas shutoff, flow control, re-fracturing and production testing.

RockSEAL H2 Packer

The RockSEAL H2 packer is a hydraulically set, mechanical packer. The dual-element design, along with premium seal technology, ensures reliable high-pressure zonal isolation during stimulation and throughout the life of the well. The RockSEAL H2 packer offers ease of installation through its short length, minimum outside diameter and anti-preset features. Hydraulic activation allows for precise control over the setting operation, resulting in time and cost efficiencies.

The StackFRAC Slimhole system has multiple applications for operators working in formations which require completion and well recovery solutions

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Slimhole technology recovers well with operational issues

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Slimhole system effectively re-stimulates a cased hole horizontal

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Go with the Flow: Reduce Water Costs Using Continuous Pumping Completions

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180236 – Slimhole Refracturing Case Studies and Experience Utilizing Mechanical Isolation for Effective Refracture Treatments

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Re-fracturing and Re-entry: Improve economics of existing wellbores

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Breaking Ground: Energy conservation and generating fracture complexity

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Slimhole System Boosts Production by up to 468 Times

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Packers Plus technology boosts barefoot well production by up to 129%

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StackFRAC Slimhole system increases production by 50%

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StackFRAC Slimhole system increases production by 299% following restimulation

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StackFRAC Slimhole restimulation of cased hole horizontal well leads to increased production

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StackFRAC Slimhole retrievable system boosts production from vertical well

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Custom solution saves tight gas well in Western Canada

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StackFRAC Slimhole system successfully used for refracture operations

See how the StackFRAC Slimhole system works


The Slimhole system is run into the well, aligning the FracPORT sleeves with the perforations.


A ball is pumped from surface to the Pump Out Plug, closing off the system and allowing pressure to build.


This pressure sets the system by hydraulically activating the packer and anchor tools. This anchors the system in the casing and creates individually isolated stages.


Once the system is set, pressuring up further opens the Pump Out Plug and enables the section below to be re-stimulated, if desired.


The next largest ball is pumped from surface and lands in the FracPORT sleeve. Hydraulic pressure is increased, causing the sleeve to open and the reservoir is stimulated through the perforations. This process is repeated in a single, continuous pumping operation. The well can be immediately flowed back and production brought on line.

 Our commitment to quality

Packers Plus successful stimulation services begin with a fully integrated quality assurance and quality control (QA/QC) process that begins at the design stage and follows each tool through manufacturing, assembly, testing, shipping and installation. Automation and robotics are incorporated into our proven process to ensure consistency and repeatability of key criteria in each step as we design, develop and manufacture our patented tools and systems. As a commitment to quality and meeting stringent standards, Packers Plus has achieved ISO 9001 certification and  API Q1 Certification for our manufacturing and engineering operations in Edmonton, AB, and ISO 9001 in Houston, TX.

Read more about our world-class manufacturing capabilities.

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