Gas Migration

During transition of a cement slurry (liquid state) to a set cement sheath (solid state), the system goes through a gel state.  During gelation, the cement column can lose the ability to transmit hydrostatic pressure effectively against formation pore pressure. Additives can be used to shorten transition time and thus help the slurry system to quickly achieve static gel strength capable of resisting pressures that otherwise can cause an influx of formation fluids into the gelled system with the potential of compromising barrier dependability prior to hard set.

Achieving gas migration control can involve:

•Transition Time – the time required for the gel strength to go from 100lbf/100ft2 to 500lbf/100ft2; the conventionally acceptable time is 30 minutes or less.

•Transition Time Reducers – extend the time required for the slurry to achieve 100lbf/100ft2 by suppressing onset of gel strength.

•Pre-Set (Slurry) Expansion - provides pressure maintenance in slurry during reduction in the hydrostatic column

GasStop™ Cement
Performs effectively in wells with overpressured zones with the potential for fluid influx into the annulus through unset cement using specially tuned systems.
GasChek® Cement Additive
Provides an effective means of helping prevent gas flow into the annulus after cement has been placed.

Gas Migration

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Summary Summary Latex 3000 Addtive_Deepwater Data Sheet
Latex 3000™ cement additive is a liquid additive designed to lower equivalent circulating density (ECD) and impart excellent fluid-loss control, high-temperature suspension properties, and acid resistance to cement slurries.
Summary Summary Latex 3000 Addtive Data Sheet
Latex 3000™ cement additive is a liquid additive designed to lower equivalent circulating density (ECD) and impart excellent fluid-loss control, high-temperature suspension properties, and acid resistance to cement slurries.
Summary Summary Halad-400L Fluid Loss Additive
Halliburton’s Halad®-400L fluid loss additive is a synthetic additive developed for temperatures from below 80°-400°F (27°-204°C) and for salt concentrations from zero percent to saturated salt concentrations. Halad-400L has been environmentally approved for use in the North Sea (exhibits biodegradability, low toxicity, and low bioaccumulation potential). This additive works without building viscosity and has a slightly dispersive character, thus the cement slurry remains thin. This additive is available as an aqueous liquid with a 22% activity.
Summary Summary Halad-400L Fluid Loss Additive
Halliburton’s Halad®-400L fluid loss additive is a synthetic additive developed for temperatures from below 80°-400°F (27°-204°C) and for salt concentrations from zero percent to saturated salt concentrations. Halad-400L has been environmentally approved for use in the North Sea (exhibits biodegradability, low toxicity, and low bioaccumulation potential). This additive works without building viscosity and has a slightly dispersive character, thus the cement slurry remains thin. This additive is available as an aqueous liquid with a 22% activity.
Summary Summary Super CBL™ & Super CBL™ EXP Additives
Super CBL™ and Super CBL™ EXP additives are plastic-state additives designed to help compensate for cement shrinkage. Cement shrinkage is a combination of the volume reduction caused by the chemical hydration process of cement and the fluid loss to the formation.
Summary Summary Stabilizer 434B Latex Stabilizer
Stabilizer 434B latex stabilizer helps prevent gas migration in Latex 2000 cement, a low fluid-loss cementing system. Latex 2000 cement is a water-internal, oil-external emulsion; in the presence of water, the system tends to come out of emulsion, losing its effectiveness against gas migration. Stabilizer 434B latex stabilizer helps prevent the de-emulsification of Latex 2000 cement.
Summary Summary Stabilizer 434B Latex Stabilizer A-4
Stabilizer 434B latex stabilizer helps prevent gas migration in Latex 2000 cement, a low fluid-loss cementing system. Latex 2000 cement is a water-internal, oil-external emulsion; in the presence of water, the system tends to come out of emulsion, losing its effectiveness against gas migration. Stabilizer 434B latex stabilizer helps prevent the de-emulsification of Latex 2000 cement.
Summary Summary Cal-Seal™ 60 Cement Accelerator
Cal-Seal™ 60 accelerator is blended with Portland cements. It helps shorten the slurry’s setting time and can improve its expansive properties.
Summary Summary GasStop™ HT (Russian)
Russian version of GasStop HT data sheet
Summary Summary GasStop™ HT A-4
GasStop HT additive is a cement polymer that helps prevent gas migration.
Summary Summary GasStop™ HT
GasStop HT additive is a cement polymer that helps prevent gas migration.
Summary Summary GasCon 469™ Additive - A4
GasCon 469™ is a liquid cement additive designed to help increase slurry stability and control free water. This additive can be used at bottomhole circulating temperatures (BHCTs) between 40° and 300°F (4° and 149°C).
Summary Summary Halad®-447 Additive
Halad®-447 is a fluid-loss additive containing polyvinyl alcohol. This additive helps prevent fluid loss and gas migration in most API and lightweight commercial cements.
Summary Summary GasCon 469™ Additive
GasCon 469™ is a liquid cement additive designed to help increase slurry stability and control free water. This additive can be used at bottomhole circulating temperatures (BHCTs) between 40° and 300°F (4° and 149°C).
Summary Summary Halad®-447 Additive (Russian)
Halad-447 Data sheet in Russian
Summary Summary Halad®-447 Additive A-4
Halad®-447 is a fluid-loss additive containing polyvinyl alcohol. This additive helps prevent fluid loss and gas migration in most API and lightweight commercial cements.
Summary Summary GasStop™ Cement
Performs effectively in wells with overpressured zones with the potential for fluid influx into the annulus through unset cement using specially tuned systems.
Summary Summary Gas Migration
Gas migration can be the result of slow static gel strength development, downhole volume losses or higher then expected reservior pressure. Operators can predict the potential for gas migration and use one or a combination of available treatments to help prevent gas flow.
Summary Summary GasChek® Cement Additive
Provides an effective means of helping prevent gas flow into the annulus after cement has been placed.
Summary Summary Halad®-447 Fluid-Loss Additive
Helps control fluid loss and gas migration in most cements at bottomhole circulating temperatures up to 210°F (99°C); above 350°F (176.7°C) it provides sedimentation and free-water control, chemical resistance, shear bonding properties, and thermal shock reduction.
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