Stab-In Float Collar & Shoe for Oil & Gas Cementing

The Stab-In Float Collar & Shoe is a specialized float tool set designed for primary casing cementing in oil and gas wells. It incorporates a stab-in design with a floating flag signal and a check-valve float system, facilitating efficient casing running and reliable prevention of cement backflow during cement displacement. 

Float collars and float shoes are key downhole completion components. They help guide the casing string into the hole, provide buoyancy to ease running, and prevent cement from flowing back into the casing once pumped into the annulus. The stab-in feature simplifies installation and improves operational efficiency.

Product Overview

A float shoe is typically installed at the bottom of the casing string to provide a streamlined guide and a check valve to stop cement backflow after placement. A float collar is positioned one or two joints above the float shoe to provide a secondary check valve and a seating surface for cement wiper plugs. Together they ensure smooth casing running, enhance cement placement, and improve zonal isolation.

The Stab-In Float Collar & Shoe integrates a floating flag signal to indicate front-end engagement and entry, aiding rig crews during running operations and reducing run time. The check-valve float design ensures that once cement is displaced into the annulus, it cannot flow back into the casing, helping maintain cement integrity and zonal separation. 

Key Features & Advantages

• Stab-In Design with Floating Flag
  Quick stab-in engagement with floating flag provides field crews with visual signal during casing running, making installation efficient and intuitive.

• Reliable Backflow Prevention
  Float check valves in both collar and shoe prevent cement slurry or drilling fluid from returning into the casing after cementing, aiding zonal isolation.

• Dual-Function Float Assembly
  Combines the float shoe’s streamlined bottom guide with the float collar’s secondary check valve and plug landing seat for effective cement displacement.

• Enhanced Operational Efficiency
  The stab-in flag and simple assembly help reduce run time and rig handling complexity.

• Broad Application Range
  Suitable for primary casing cementing across a wide range of oil and gas well projects.

Technical Specifications

Applications

The Stab-In Float Collar & Shoe is widely used for:

• Primary casing cementing in oil and gas wells

• Cement jobs requiring efficient run-in and reliable one-way flow check

• Operations where reduced run time and clearer engagement indication are desired

• Onshore and offshore completion applications

Float collar and shoe assemblies play a key role in ensuring the casing string is supported, cement is placed effectively, and unwanted backflow of cement slurry is prevented, improving overall well integrity.

Frequently Asked Questions

Q1: What is a float collar and shoe assembly?
A float collar & shoe assembly consists of a float shoe installed at the bottom of the casing and a float collar above it. The assembly provides casing guidance, check-valve backflow prevention, and a seating point for cement wiper plugs during primary cementing. 

Q2: How does the stab-in design improve run operations?
The stab-in design with a floating flag provides a clear visual signal during casing run-in, making it easier for rig crews to confirm proper engagement and reducing running time.

Q3: What sizes are available?
This float assembly is offered in sizes from 5″ through 13-3/8″, covering a wide range of casing requirements. 

Q4: Why is backflow prevention important in float equipment?
Backflow prevention ensures that once cement slurry is displaced into the annulus, it cannot flow back into the casing string, improving zonal isolation and cement bond quality.