kwik-ZIP

Inert centralizers should be used on both casing and gravel packed screens.

The casing annulus in all water wells and monitor wells should be cement grouted from the top of the production zone back to surface.

The grout seal protects the casing from corrosion, and both the well itself and aquifers through which it is drilled, from surface and sub-surface sources of contamination.

Correct cement grouting has also been shown to dramatically reduce vertical leakage via the annulus to the production / intake zone of heavy metals such as Arsenic. Studies in the USA have indicated that a correctly grouted casing can reduce recorded Arsenic levels in the water produced from a well.
National Ground Water Association, Water Well Journal, p.30, June 2006.

It is not possible to correctly grout a casing and maintain protection without the use of correctly designed inert centralizers at appropriate intervals (generally every 20 to 30 ft) to keep the casing from touching the borehole wall during grouting.

Inert centralisers should also be used on all gravel packed screens to ensure centralization of the screen prior to gravel pack installation.

kwik-ZIP Centralizers are ideal for this application for both domestic household wells and deep large diameter commercial wells.

kwik-ZIP® products are often used on Oil & Gas production wells when verticality and other conditions such as extreme depth & temperature do not require the use of an API 10D type spring steel centralizer.

The API 10D standard for spring steel centralizers is intended to apply to wells that are drilled with dog legs and have a relatively severe level of deviation (average of 30 degree from vertical). A high proportion of Oil & Gas wells do not fall into this category, and thus assuming other conditions and regulations permit, kwik-ZIP® products should be considered.

Vertical Coal Seam Gas wells a prime example of Oil & Gas applications for which kwik-ZIP® products are routinely used.

Another Oil & Gas application in which kwik-ZIP products are often used is in waterflood or produced water injection wells. These wells are used to dispose of saline water produced from oil & gas wells and to help maintain pressure in the reservoir In most cases the fluid being re-injected is highly corrosive and thus it is essential that inert centralizers are considered.

kwik-ZIP® products have recently been further customised for the soil stabilization and foundation industry.

Generally speaking, all grouted rock bolts, anchors, soil nails, and piles should be constructed with inert centralizers or spacers to protect the tendon, bolt, or nail from corrosion and to maintain an even grout cover.

The unmatched flexibility of kwik-ZIP® products can now be applied to all of these applications. As with other kwik-ZIP® products, more centralizer segments are simply added to accommodate increases in diameter. This removes the need to carry different centralizer or spacer models for different diameters.

kwik-ZIP products are also being applied to the pipeline industry for spacing and insulating carrier pipes on cased crossings etc. The kwik-ZIP system is considered an ideal spacer or insulator for many pipeline applications.

Depending on the diameter and weight of the pipeline, the kwik-ZIP spacer is used approximately every 2 metres for this application.

The kwik-ZIP® system has also been applied to pipeline surface cradle stanchions or piles constructed from square or C section beams.

As with standard piles, such stanchions need to be grouted in place to stabilize and prevent corrosion. It is therefore necessary to ensure that the stanchion is centralized in the drilled hole prior to setting with grout. The unique flexibility of the collars on the kwik-ZIP® centralizer system allow it to be applied to such irregular profiles and square beams.