Dissolvable Frac Plugs for Severe Casing Restrictions | Wizard HEDP Case Study

In unconventional shale developments, casing deformation has become one of the most difficult challenges affecting modern plug and perf operations. Across the southwestern shale region of China, operators are increasingly encountering severe restrictions caused by formation stress changes during hydraulic fracturing, poor cementing quality, and mechanical damage while running casing.

These deformations create major obstacles during well completion activities. Standard frac plugs frequently become stuck while running through restricted sections, leading to lost bottom hole assemblies (BHAs), failed stages, expensive fishing operations, and significant non-productive time (NPT).

To overcome these challenges, Vertechs developed the Vertechs Wizard HEDP Dissolvable Plug — an advanced slim plug specifically engineered for extreme downhole restrictions where conventional dissolvable frac plugs cannot operate effectively.

According to the published field case study, the technology successfully restored completion access in severely deformed laterals while saving more than 30 stages across six wells.

Why Conventional Frac Plugs Struggle in Deformed Casing

In many shale wells, operators commonly run 5.5" 26.8# casing. However, most conventional frac plugs used in plug and perf applications measure approximately 4.055" or larger in outer diameter.

When casing deformation occurs, the restriction diameter can become dramatically smaller than the original casing ID. In the case documented by Vertechs, the restriction was reduced to approximately 2.756".

This creates an extremely difficult engineering problem:

• The plug and tool string must remain smaller than 2.756" to pass through the restriction

• After passing through, the tool must still expand and set securely inside 4.5" inner diameter casing

• The plug must maintain pressure integrity during fracturing operations

• Reliability must be maintained under severe casing ovality and deformation

Many high-expansion fracking plugs available on the market are designed to pass through tight spots, but in extreme deformation scenarios, even those systems can fail.

The operational consequences can be severe:

These challenges are becoming more common as hydraulic fracturing activity continues expanding across unconventional shale developments.

The Wizard HEDP Solution for Extreme Restrictions

The Wizard HEDP system was developed specifically to address the limitations of traditional dissolvable frac plugs in severely restricted laterals.

Unlike conventional frac plugs, the Wizard HEDP combines an ultra-slim outer diameter with an unprecedented expansion capability. According to Vertechs, the tool is capable of passing through tight restrictions and then setting reliably inside 3.5"–5.5" casing strings.

One of the most significant achievements highlighted in the case study was the plug’s extremely compact profile:

• Outer diameter: only 2.36"

• Restriction encountered: approximately 2.756"

• Final expansion capability: up to 90.5% expansion

• Differential pressure applied: 7 KPSI

This allowed the tool to successfully pass through one of the most severe casing restrictions encountered in the region before expanding and setting securely inside normal casing.

Field Results from the Wizard HEDP Case Study

The field deployment demonstrated how dissolvable frac plugs can help operators recover otherwise untreatable stages and reduce costly intervention time.

Key Results

The plug reportedly passed through the severe restriction “without any issues,” then successfully isolated the target interval after expansion.

In another severely deformed lateral, operators saved more than 120 hours of completion time by using the Wizard HEDP dissolvable frac plug system.

How Dissolvable Frac Plugs Improve Well Completion Efficiency

Traditional frac plugs typically require mill-out operations after fracturing. These interventions add operational complexity, increase coiled tubing requirements, and expose operators to additional mechanical risks.

Dissolvable frac plugs eliminate this step by dissolving after completing isolation duties, allowing operators to transition more quickly into production phases.

According to Vertechs, their dissolvable plug technologies have already achieved more than 100,000 successful runs worldwide while helping reduce completion time and costs by approximately 15%–22%.

The Wizard HEDP extends those advantages into environments previously considered too difficult for conventional plug and perf systems.

Additional features include:

• Fully dissolvable construction

• No post-frac intervention required

• Metal seal and hybrid seal options

• Compatibility with wireline or hydraulic setting tools

• Designed for extreme casing deformation conditions

Why High-Expansion Slim Plug Technology Matters

As unconventional reservoirs become more complex, casing deformation is no longer considered an isolated issue. Operators worldwide are increasingly encountering oval casing sections, collapsed intervals, and severe restrictions during hydraulic fracturing campaigns.

This makes slim plug technology increasingly important for future oil and gas developments.

The Wizard HEDP demonstrates how modern dissolvable frac plugs can adapt to extreme downhole conditions while maintaining pressure integrity and operational reliability. By combining ultra-small outer diameters with very high expansion ratios, these tools help operators continue stimulation programs that might otherwise be abandoned.

For plug and perf operations facing severe restrictions, technologies like Wizard HEDP represent a major advancement in well completion efficiency, intervention reduction, and stage recovery.

For more technical information about dissolvable frac plug solutions, Please contact us.

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