Mechanical Stage Collar for Oil & Gas Well Cementing

The Mechanical Stage Collar is a downhole cementing tool designed for staged cementing operations in oil and gas well completion. Unlike hydraulic stage collars, this tool uses a shear-set mechanical sliding sleeve that is opened by applying surface pressure to shear pins, providing a reliable method for controlled staged cementing without requiring hydraulic shift tools. 

Stage collars are used to create multiple cementing stages in the casing string, allowing operators to place cement at specific intervals. The mechanical activation method ensures ease of use and straightforward deployment in standard drilling environments.

Product Overview

Mechanical stage collars are installed inside the casing string before running into the hole. They have a sliding sleeve that covers circulation ports. When surface pressure is applied and designated shear pins break, the sliding sleeve moves to expose the ports, enabling cement slurry to pass into the annulus for that stage. This results in controlled cement job sequencing and improved zonal isolation. 

The Mechanical Stage Collar from Shangshan Petro features a simple mechanical shear-set design that is reliable and easy to operate for most onshore and offshore cementing operations.

Key Features & Advantages

• Mechanical Shear-Set Sliding Sleeve
  The sliding sleeve is opened by surface pressure that shears designated pins, offering predictable and reliable activation without hydraulic tools. 

• Suitable for Standard Cementing Operations
  Ideal for cementing jobs that do not require hydraulic actuation, reducing complexity and operational cost. 

• Defined Pressure Activation
  Designed to open at a specific surface pressure range, ensuring dependable staged cementing results. 

• Compact Construction
  Precision machined sliding sleeves and ports for smooth circulation and efficient cement placement at each stage. 

Technical Specifications

Applications

The Mechanical Stage Collar is widely used in:

• Stage cementing for casing strings in oil & gas wells

• Staged cement displacement at specific intervals

• Cementing jobs where mechanical actuation is preferred

• Onshore and offshore completion operations

Mechanical stage collars help operators perform staged cementing without the need for hydraulic shift tools, offering a simpler and cost-effective option for zonal isolation.

Frequently Asked Questions

Q1: What is a mechanical stage collar?
A mechanical stage collar is a downhole cementing tool that uses a shear-set mechanical sliding sleeve to open circulation ports for staged cementing, eliminating the need for hydraulic shift tools.

Q2: How is the sliding sleeve activated?
The sliding sleeve is activated by applying surface pressure to shear pins, allowing the sleeve to move and expose ports for cement circulation.

Q3: What size options are available?
This mechanical stage collar is available in 5-1/2″ and 7″ sizes, covering common casing sizes used in oil and gas wells.

Q4: Why choose a mechanical stage collar over hydraulic?
Mechanical stage collars are simpler to operate and do not require hydraulic tools, reducing operational complexity and cost for standard cementing jobs.