Corrosive Environments

(Salt, CO2)

Wellbore integrity can be challenged with chemically corrosive environments that induce cyclic loading from geo-mechanical and geo-chemical stresses.  In these harsh environments, the cement sheath and zonal isolation devices need to be designed to resist failure from deformation, fatigue, fracturing and corrosion.

Salt zones can range in width from a few feet to hundreds of feet.  Besides contamination or corrosion, salt zones can flow unevenly around well casing, causing irregular external loading that can ultimately result in a partial collapse of the casing or complete well failure.  The effects of loading from salt creep can be modeled using a finite element analysis tool.  This analysis helps determine an optimized slurry system capable of overcoming the chemical challenge of a brine attack, while developing optimum mechanical properties for the life of the well, short and long term.

Conventional slurry systems are prone to shrinkage during curing and can be susceptible to destabilization even in the less harsh environments of dry CO2. More threatening is CO2 gas in the presence of water because it can produce carbonic acid that may contact and slowly weaken cement by a chemical conversion called carbonation. In some cases, the cement may lose enough strength to potentially impair zonal isolation integrity.  Therefore, the cement system should be designed to overcome destabilization from chemically-induced corrosion at any point during the life of the well.

Halliburton has a number of corrosion-resistant cement systems that can be tailored to specific well requirements – reservoir type, reservoir properties, temperatures, pressure, and the injected gas composition are some of the factors to consider when selecting the ideal sealant.  These cement systems include low- or non-Portland systems, resin blends, slurries with optimized mechanical properties. 

Corrosives - Challenges

Corrosive Environment Challenges If Unaddressed
Complete slurry placement and competent cement sheath.

Long wait on cement times and/or incomplete zonal isolation.

Column buckling or bending (axial load exceeded).

Completion operation or workover tools obstructed.

Non-uniformity of formation load transfer (compaction resistance exceeded).

Casing collapse; unacceptable risk to completion string and production volumes.

Crushed section of casing (transverse crushing load exceeded).

Casing gets locked into moving axially with salt flow (or sand compaction).

Fatigue, erosion, destruction of well architecture. Well remediation costs exceed production values.

Solutions for Corrosive Environments

Cement Systems

ThermaLock™ Cement
A specially formulated calcium phosphate cement that is both CO2 and acid resistant.

Filter By  
Количество записей на странице Show     results per page
  TitleНазвание  DateДата
Summary Summary SaltShield Cementing Service
SaltShield cementing service is a combination of WellLife service, an advanced modeling tool for planning and SaltShield cement, an advanced cement system designed with properties to overcome issues from simple and complex salts.
Summary Summary ThermaLock™ Cement
ThermaLock™ cement is a specially formulated calcium phosphate cement that is both CO2 and acid resistant. The result of a joint development project for high temperature, geothermal wells, ThermaLock cement is now being promoted as an alternative for Portland cement wherever CO2 may be encountered.
Summary Summary Fresh Approach Pays Off -- Innovation of WellLock resin system
This article originally ran in the "Innovators" section of the March 2015 issue of Canada's "New Technology" Magazine. It features the development work toward what became WellLock resin by Dr. P. Jones.
Summary Summary Corrosive Environments
Increasingly common, wellbores intersect massive salt and/or CO2 zones that can cause mechanical destruction and/or chemical erosion of the cement sheath, which may lead to damaged casing and in severe cases may result in a lost well.
Summary Summary ThermaLock™ Cement
A specially formulated calcium phosphate cement that is both CO2 and acid resistant.
Summary Summary CO2 Resistant Cementing Solution
Designed to prevent or stop the flow of unwanted fluid and gas in the cemented annulus at any time during the life of the well, after well abandonment (project closure phase), and the post closure phase of the project – an environmental imperative when CO2 is being stored underground in CCS (carbon capture & storage) and CO2 EOR projects or when CO2 is found in the hydrocarbon producing formation surrounding a producing well.
Summary Summary CO2 Resistant Cementing Solution
Designed to prevent or stop the flow of unwanted fluid and gas in the cemented annulus at any time during the life of the well, after well abandonment (project closure phase), and the post closure phase of the project – an environmental imperative when CO2 is being stored underground in CCS (carbon capture & storage) and CO2 EOR projects or when CO2 is found in the hydrocarbon producing formation surrounding a producing well.
Related Information

Related Information Дополнительная информация

Showcase

Previous
1 of 1
Next
SaltShield™ Cement
SaltShield™ cement helps enable placement of full columns of cement across the salt zone...