Cementing the casing and liner strings in place in oil and gas wells is integral to wellbore architecture, which in turn is integral to well performance and total hydrocarbon recovery. Conventionally, cementing is viewed as a one-time event, yet it serves as a foundation for ultimate recovery if engineered to withstand pressure and temperature differentials during life of the well events such as completion operations, fracture stimulation, and production cycles. In other words, rather than simply being the last step during drilling operations, it is economically more beneficial to view cementing as the first step in completion operations.
The cement sheath can be subject to thousands of psi (pounds per square inch) pressure changes and hundreds of degrees of temperature changes (Fahrenheit) throughout the life of the well. In spite of such dynamic fluctuations, the cement sheath is expected to resiliently withstand immediate and cumulative stresses, retaining seal integrity to securely isolate producing zones and restrain unwanted fluid production.
Today‘s and tomorrow‘s reservoirs are deeper, hotter and under higher pressure than yesterday‘s easy oil. Subsequently, wellbore challenges and achieving wellbore integrity are more complicated than ever before. These wells are likely to push or exceed the standard operating envelopes. Thus, Halliburton offers cementing systems designed to mitigate the effects of extreme loads imposed on the cement sheath in order to help avoid debonding from the casing or shear deterioration in the cement sheath.
ElastiSeal™ Cements
Designed to create a more elastic wellbore sheath
With Tuned Cementing Solutions™ cementing systems, Halliburton has created a set of innovative fit-for-purpose solutions with the flexibility required to allow each system to be tuned specifically for a given set of wellbore conditions. ElastiSeal cements form one of these families of fit-for-purpose solutions.
With ElastiSeal cement you receive a foamed cementing solution designed to create a more elastic wellbore sheath. This increased elasticity in the set cement will allow the cement to be more capable of withstanding the stresses present in the downhole environment. If the stresses can be safely absorbed, the cement sheath can maintain its seal. ElastiSeal cements can provide the additional benefits of increased compressibility, bridging, and elasticity gained through the introduction of stable, well-dispersed small N2 bubbles.
LifeCem™ 100 Cement Additive
LifeCem™ 100 cement additive enables the cement sheath to be resilient and flexible as well as self-healing to help maintain zonal-isolation integrity throughout the cumulative stresses brought on by oil-or gas-well completion and production. These attributes enable interventionless remediation of the cement sheath should radial cracking, deformation of the sheath, or de-bonding occur (possibly resulting in sustained casing pressure) at any point during the life of the well. The LifeCem 100 additive is able to react with liquid hydrocarbon, expand, and help prevent further fluid migration. This self-healing cement has been proven to reduce or eliminate sustained casing pressure by healing the cement and restoring zonal isolation.
The LifeCem™ 100 cement additive is part of a family of WellLife® III cementing service additives used to modify the mechanical properties of Halliburton cementing systems. The primary use of LifeCem™ 100 cement additive is to modify the Young’s modulus and Poisson’s ratio of set cement; and if liquid hydrocarbon is present, to swell into the void space of microfissures should any form in the cement sheath during the life of the well. All of this is intended to sustain zonal isolation integrity by conveying to the sheath an ability to resist cyclic loading.
The primary use of LifeCem 100 cement additive is to increase the set cement sheath’s capability to resist cyclic loading. This additive achieves this by modifying the Young’s modulus and Poisson’s ratio of set cement, and by sealing microannuli if they form in the sheath.
•Can swell into and seal off microannuli when exposed to liquid hydrocarbons
•Can increase the elasticity of the cement sheath, which helps the set-cement sheath better withstand stresses and cyclic loading
•Recommended for elevated temperatures up to 500°F (260°C).
The Family of WellLife® Additives
WellLife® additives are used to modify the set-cement sheath’s mechanical properties with the goal of making it less brittle, more resilient and more elastic than conventional cement. Increasing the elasticity and resilience of the set cement sheath with the use of an additive in the WellLife family of additives helps eliminate or at least minimize damage caused by stresses induced during well activities. Stressed wells would include steam injection, SAGD, high-pressure/high-temperature (HPHT), deepwater, geothermal, or wells with cyclic loading.
Halliburton’s WellLife additives are either carbon fiber or elastomeric. The carbon fiber additives act much like rebar, helping increase tensile strength of the set cement sheath. The elastomeric WellLife additives help increase the cement sheath’s ability to resist cumulative stress and cyclic loading by lowering the Young’s modulus and raising Poisson’s ratio.
WellLife® 665 additive: This elastomeric additive is intended for use with lighter-weight slurries. Recommended for temperatures up to 500°F (260°C); however, at temperatures above 400°F (204.4°C) it is recommended to use WellLife® 809 additive in combination with WellLife 665 additive to help enhance performance at higher temperatures.
WellLife® 684 additive: This carbon fiber additive helps increase the tensile strength of set cement without significantly decreasing the compressive strength, acting much like tension carrying and ductile reinforcing rods (rebar) throughout the sheath. This additive does not have an upper temperature limit.
WellLife® 708 additive: This elastomeric additive is designed to increase the ductility of the set cement sheath. Tested and found to be effective at temperatures up to 300°F (149°C).
WellLife® 734 additive: This carbon fiber additive helps increase the tensile strength of set cement and mitigate the effects of shrinkage that may occur during cement slurry hydration.
WellLife 809 additive: This elastomeric additive is recommended for temperatures up to 500°F (260°C) and is intended for use with lighter weight slurries.
WellLife® 810 additive: This elastomeric additive helps improve elastomer bonding with cement when used as a supplemental additive in conjunction with WellLife 665 additive and/or WellLife 809 additive.
WellLife® 930 additive: This is a heavy weight elastomer ideal for 14 ppg slurries and above. It reduces the mixing complexity on location of conventional elastomeric additives with heavyweight slurries that would otherwise require the use of a broad combination of additives in order for the slurry to achieve mixability, necessary density and desirable rheology. Helps prevent gas migration.
WellLife® 987 additive: This is a heavy weight elastomer ideal for 14 ppg slurries and above. It reduces the mixing complexity on location of conventional elastomeric additives with heavyweight slurries that would otherwise require the use of a broad combination of additives in order for the slurry to achieve mixability, slurry stability, necessary density and desirable rheology. Helps prevent gas migration.
WellLife® 1094 additive: This carbon fiber additive is designed to address mixability while helping enhance the tensile strength of the cement system into which it is blended. Additionally, this additive can be used to address lost circulation.
For more specifications:
http://www.halliburton.com/en-US/ps/cementing/cementing-solutions/life-of-the-well/default.page?node-id=hfqela49
The cement sheath can be subject to thousands of psi (pounds per square inch) pressure changes and hundreds of degrees of temperature changes (Fahrenheit) throughout the life of the well. In spite of such dynamic fluctuations, the cement sheath is expected to resiliently withstand immediate and cumulative stresses, retaining seal integrity to securely isolate producing zones and restrain unwanted fluid production.
Today‘s and tomorrow‘s reservoirs are deeper, hotter and under higher pressure than yesterday‘s easy oil. Subsequently, wellbore challenges and achieving wellbore integrity are more complicated than ever before. These wells are likely to push or exceed the standard operating envelopes. Thus, Halliburton offers cementing systems designed to mitigate the effects of extreme loads imposed on the cement sheath in order to help avoid debonding from the casing or shear deterioration in the cement sheath.
ElastiSeal™ Cements
Designed to create a more elastic wellbore sheath
With Tuned Cementing Solutions™ cementing systems, Halliburton has created a set of innovative fit-for-purpose solutions with the flexibility required to allow each system to be tuned specifically for a given set of wellbore conditions. ElastiSeal cements form one of these families of fit-for-purpose solutions.
With ElastiSeal cement you receive a foamed cementing solution designed to create a more elastic wellbore sheath. This increased elasticity in the set cement will allow the cement to be more capable of withstanding the stresses present in the downhole environment. If the stresses can be safely absorbed, the cement sheath can maintain its seal. ElastiSeal cements can provide the additional benefits of increased compressibility, bridging, and elasticity gained through the introduction of stable, well-dispersed small N2 bubbles.
LifeCem™ 100 Cement Additive
LifeCem™ 100 cement additive enables the cement sheath to be resilient and flexible as well as self-healing to help maintain zonal-isolation integrity throughout the cumulative stresses brought on by oil-or gas-well completion and production. These attributes enable interventionless remediation of the cement sheath should radial cracking, deformation of the sheath, or de-bonding occur (possibly resulting in sustained casing pressure) at any point during the life of the well. The LifeCem 100 additive is able to react with liquid hydrocarbon, expand, and help prevent further fluid migration. This self-healing cement has been proven to reduce or eliminate sustained casing pressure by healing the cement and restoring zonal isolation.
The LifeCem™ 100 cement additive is part of a family of WellLife® III cementing service additives used to modify the mechanical properties of Halliburton cementing systems. The primary use of LifeCem™ 100 cement additive is to modify the Young’s modulus and Poisson’s ratio of set cement; and if liquid hydrocarbon is present, to swell into the void space of microfissures should any form in the cement sheath during the life of the well. All of this is intended to sustain zonal isolation integrity by conveying to the sheath an ability to resist cyclic loading.
The primary use of LifeCem 100 cement additive is to increase the set cement sheath’s capability to resist cyclic loading. This additive achieves this by modifying the Young’s modulus and Poisson’s ratio of set cement, and by sealing microannuli if they form in the sheath.
•Can swell into and seal off microannuli when exposed to liquid hydrocarbons
•Can increase the elasticity of the cement sheath, which helps the set-cement sheath better withstand stresses and cyclic loading
•Recommended for elevated temperatures up to 500°F (260°C).
The Family of WellLife® Additives
WellLife® additives are used to modify the set-cement sheath’s mechanical properties with the goal of making it less brittle, more resilient and more elastic than conventional cement. Increasing the elasticity and resilience of the set cement sheath with the use of an additive in the WellLife family of additives helps eliminate or at least minimize damage caused by stresses induced during well activities. Stressed wells would include steam injection, SAGD, high-pressure/high-temperature (HPHT), deepwater, geothermal, or wells with cyclic loading.
Halliburton’s WellLife additives are either carbon fiber or elastomeric. The carbon fiber additives act much like rebar, helping increase tensile strength of the set cement sheath. The elastomeric WellLife additives help increase the cement sheath’s ability to resist cumulative stress and cyclic loading by lowering the Young’s modulus and raising Poisson’s ratio.
WellLife® 665 additive: This elastomeric additive is intended for use with lighter-weight slurries. Recommended for temperatures up to 500°F (260°C); however, at temperatures above 400°F (204.4°C) it is recommended to use WellLife® 809 additive in combination with WellLife 665 additive to help enhance performance at higher temperatures.
WellLife® 684 additive: This carbon fiber additive helps increase the tensile strength of set cement without significantly decreasing the compressive strength, acting much like tension carrying and ductile reinforcing rods (rebar) throughout the sheath. This additive does not have an upper temperature limit.
WellLife® 708 additive: This elastomeric additive is designed to increase the ductility of the set cement sheath. Tested and found to be effective at temperatures up to 300°F (149°C).
WellLife® 734 additive: This carbon fiber additive helps increase the tensile strength of set cement and mitigate the effects of shrinkage that may occur during cement slurry hydration.
WellLife 809 additive: This elastomeric additive is recommended for temperatures up to 500°F (260°C) and is intended for use with lighter weight slurries.
WellLife® 810 additive: This elastomeric additive helps improve elastomer bonding with cement when used as a supplemental additive in conjunction with WellLife 665 additive and/or WellLife 809 additive.
WellLife® 930 additive: This is a heavy weight elastomer ideal for 14 ppg slurries and above. It reduces the mixing complexity on location of conventional elastomeric additives with heavyweight slurries that would otherwise require the use of a broad combination of additives in order for the slurry to achieve mixability, necessary density and desirable rheology. Helps prevent gas migration.
WellLife® 987 additive: This is a heavy weight elastomer ideal for 14 ppg slurries and above. It reduces the mixing complexity on location of conventional elastomeric additives with heavyweight slurries that would otherwise require the use of a broad combination of additives in order for the slurry to achieve mixability, slurry stability, necessary density and desirable rheology. Helps prevent gas migration.
WellLife® 1094 additive: This carbon fiber additive is designed to address mixability while helping enhance the tensile strength of the cement system into which it is blended. Additionally, this additive can be used to address lost circulation.
For more specifications:
http://www.halliburton.com/en-US/ps/cementing/cementing-solutions/life-of-the-well/default.page?node-id=hfqela49
