ZoneSeal® Isolation Process

The ZoneSeal® Isolation Process is a fully engineered zonal isolation process with automated controls to deliver the benefits of light-weight (foam) cement for the life of the well.  The ZoneSeal process begins with pre-job evaluation and continues through to operations at the wellsite and to post-job follow up.

Pre-job Evaluation

OptiCem™ Cement Job Design and Simulation System, along with specialized laboratory testing (standardized within Halliburton globally), provides an engineered solution to specific challenges of each well.  This engineered approach helps optimize the annular seal not only for a good bond log, but also for years of withstanding temperature and pressure changes in the wellbore.  This integrated solution includes a pumping/displacement plan and a customized slurry blend designed with appropriate chemical and mechanical properties tailored to the unique attributes of each reservoir and well, taking into account all aspects of the formation throughout the annulus.  The goal is an optimized annular seal to enhance well economics by helping to minimize the need for remediation and maximize ultimate recovery.

Field Operations

The field process is achieved by full automation of the blending, pumping and injection actions for greater control.  Additionally, the equipment (cement pumping unit, nitrogen unit and injection unit) is integrated, providing precision in shearing the slurry to create a stable foam.   

Post-job Follow Up

Process-certified specialists monitor the job throughout the design and field operations and then provide a post-job report. 

The Advantages of Foam Cement

Foam cement provides particular benefits in geothermal wells due to its lower thermal conductivity and other enhanced mechanical properties. A low thermal conductivity cement sheath allows for less and slower heat transfer/heat loss in the wellbore. This benefit will allow for more productive steam-generating wells in geothermal projects. These enhanced mechanical properties will allow more flexibility for the cement sheath to respond to the effects of excessive temperatures in the wellbore, therefore maintaining cement sheath integrity and providing zonal isolation/casing protection.

  • Designed low permeability
  • Low Young's modulus 
  • Enhanced mechanical properties to make the sealant sheath resilient
  • Lower thermal conductivity values
  • Low densities
  • Relatively high compressive strength
  • Variable density flexibility
  • System simplicity

Enhanced and highly-engineered mechanical properties of the cement sheath allow it to move with the wellbore and also absorb stresses resulting from the mechanical shocks from pipe tripping to expansion and contraction of the casing during pressure and well testing, injection and production cycling.

Importantly, foam cement establishes a tight bond for a reliable annular seal because the nitrogen bubbles help to prevent shrinkage while the cement slurry goes through the hydration stage. A foamed system, due to its expansion properties, also accommodates challenging wellbore geometries such as wash-outs.

It is important to note that foam cement has historically been used primarily for reduction of slurry density. Halliburton has delivered foam cement systems much lighter than water, yet without compromising essential mechanical properties to establish life-of-the-well zonal isolation.

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  TitleНазвание  DateДата
Summary Summary ZoneSeal Light Foam Cement System Sign in required
ZoneSeal® Light cement system is a system for performing foam cementing jobs when the calculated nitrogen volume is limited. Instead of using liquid nitrogen and a nitrogen converter, gasous nitrogen is used. The ZoneSeal Light system is a fully integrated and automated system that helps ensure that the foaming process is controlled.
Summary Summary ZoneSeal Light Foam Cement System-H07083 (A4) Sign in required
ZoneSeal® Light cement system is a system for performing foam cementing jobs when the calculated nitrogen volume is limited. Instead of using liquid nitrogen and a nitrogen converter, gasous nitrogen is used. The ZoneSeal Light system is a fully integrated and automated system that helps ensure that the foaming process is controlled.
Summary Summary Cobra Frac H Service
Cobra Frac® H service enables a virtually unlimited number of frac stages in a horizontal section plus post-frac analysis to determine the e9ectiveness of the treatment.
Summary Summary ZoneSeal Isolation Process and Foam Systems
The ZoneSeal Isolation Process helps ensure a stable, foamed slurry. The process includes a fully integrated automated system that adjusts nitrogen content to maintain constant density by accounting for increasing hydrostatic pressure with depth.
Summary Summary ZoneSeal Isolation Process and Foam Systems
The ZoneSeal Isolation Process helps ensure a stable, foamed slurry. The process includes a fully integrated automated system that adjusts nitrogen content to maintain constant density by accounting for increasing hydrostatic pressure with depth.
Summary Summary ZoneSeal® Injection-Pump Skid Cementing Services
The pump system used in the ZoneSeal process has been cementing upgraded. The upgraded ZoneSeal injection pump skid is a compact, portable, automated pumping system used primarily with the cementing trailer and nitrogen unit for the ZoneSeal process.
Summary Summary ZoneSeal® Isolation Process
A fully engineered zonal isolation process with automated controls to deliver the benefits of light-weight (foam) cement during placement and for the life of the well.
Summary Summary Annular Pressures
Pressure behind casing caused by expansion of fluid/gas due to thermal expansion from warmer wellbore or production fluids or due to fluid/gas migration higher in the annulus from higher-pressure zones below.
Summary Summary ZoneSealant™ 2000 Agent
A single-component cement foamer/stabilizer that can be used in fresh water, seawater, and salt slurries for use in standard applications requiring foamed cements.
Summary Summary Dual Injection ZoneSeal® Process Job—Western U.S.
In this Western U.S. well, the ZoneSeal® dual injection method was chosen because of significant CO2 gas breakthrough in the wellbore annulus (~3,000 ppm), plus the fact that pumping down the annulus was projected to be a way to contain/kill CO2 gas.
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