Cementing

GasStop™ Gas Migration Control AdditiveControls Gel Strength Development to Help Stop Gas Migrationand Allow Better Cementing

Halliburton GasStop additive offers a unique approach togas migration control that has proven effective in areasnotorious for gas flow problems. By delaying gel strengthdevelopment, GasStop additive can permit the cement column to transmit virtually the full hydrostratic pressure to potential gas zones. This process occurs even during periods of significant fluid loss to the formation. At the endof the delayed gel time period, cement GasStop additive setsrapidly, further helping to prevent gas migration.

Effective and Economical

GasStop additive has been specially formulated to workunder virtually any conditions. It is also significantly less expensive than any comparable gas control cement previously available.

GasStop

• Can control gas migration in wells from 60°F to 230°Fwith gas flow potential from 2 to 7

• Can fluidize saturated salt slurries at 80°F by controlling salt gelation

• Can provide excellent fluid loss control from 60°F to 230°F

• Works effectively in fresh water or in salt slurries of all concentrations

• Has been exhaustively field tested and proven under the most challenging conditions

Case History — Offshore Louisiana

The Problem: The Eugene Island area in the Gulf ofMexico is notorious for its severe gas migration problems.Shallow gas hazards and very high formation permeabilities contribute to the situation, resulting in occasional blowouts.

A major operator in the area encountered a gas flow problem while running a 7-in. liner from 10,800- to 13,100-ft. Casing above the liner was 9-5/8 in. Gas was entering at 12,500 ft with a pore pressure of 16.3pounds per gallon (ppg).

The Solution: Halliburton recommended a slurry consistingof premium cement, Oklahoma No. 1 sand, GasStop additive, CFR-3™ dispersant, D-Air 1™ antifoam agent and HR-5 retarder. Following the job, gas flow at the liner topstopped, and the overlap was successfully pressure tested.The operator was extremely pleased with the results.

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Wide-Ranging Compatibility

GasStop additive is compatible with all commonly used dispersants, weighting agents, lightweight additives, silica,water-control materials, retarders and suspending aids.When SA-541™ suspension aid is used with GasStopadditive, gels can develop that are strong enough to interferewith gas control in delayed-gel slurries.

Benefits of Better Gas Migration Control

Better gas migration control can mean:

• Greater cement integrity and improved zonal isolation

• Reduced expenses for remedial squeeze cementing

• Less chance of damaging tubulars

• Lower risk of subsurface blowouts

Halliburton GasStop additive significantly delays gel strength development. This allows thecement column to transmit virtually the full hydrostatic pressure, while compensating for volumedecreases due to fluid loss.

Get the protection you need with Halliburton GasStop additive, the right choice for controllinggas migration in wells from 60°F to 230°F, with gas flow potential from 2 to 7.

For more information on how GasStop additive can control gel strength development in a wide variety of wells and conditions,

contact your local Halliburton representative.

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