One of the keys to successfully achieving zonal isolation is preparing the wellbore to receive cement. This is done by using spacers to fully displace drilling fluid from the annulus and condition the casing and annular surface to accept a cement bond. Spacers and flushes are intended to displace drilling fluid from the annulus, leave the casing and formation water-wet (free of oil), and separate drilling fluids from the cement slurry. Thus, the spacer is pumped ahead of the lead cement slurry. Flushes are used to thin and disperse drilling-fluid particles.
If even a thin layer of oil from the drilling fluid is left on the casing and/or the formation it can prevent the cement slurry from directly contacting each surface to form a good bond. A properly conditioned hole has the best chance for a good cement job and the least chance of annular gas migration problems or costly remediation and squeeze cement operations.
The performance of a spacer mainly depends on
The rheology of spacer at the desired elevated temperature;
The compatibility of the spacer with the drilling fluid (mud) and the cement;
The volume of spacer necessary to provide sufficient separation of the cement from the mud to prevent the cement from becoming contaminated by the drilling fluid;
Contact time and pump rate of the spacer to optimize drilling fluid displacement and removal.
Halliburton offers spacers and flushes to help operators improve the probability of returning uncontaminated mud to the surface and securing a successful primary cement job.
Designed for salt water applications, a colloidal clay mineral composed primarily of magnesium silicate, silica and crystalline quartz that functions as a suspending agent and can swell in salt water.
A biodegradable spacer designed to address displacement and water-wetting requirements during primary cementing operations, remaining highly functional while addressing the lowest level of environmental impact.
Functions as a low viscosity, weighted flush for primary and secondary cementing operations, can be designed to displace water-based or oil-based muds, can be used at temperatures from 60°F (16°C) to 500°F (260°C).
Acts as a dispersant for clay particles and as a water-wetting surfactant to chemically remove drilling mud and leave all downhole surfaces water-wet, has been environmentally evaluated according to OSPAR commission regulations.
Specifically designed to cure losses and enable further drilling by achieving early static gel strength; helps achieve zonal isolation by accomplishing intended top of cement.
Tuned® Defense™ cement spacer is the next-generation adjustable rheology cement spacer with lost circulation capabilities to maintain wellbore stability.
Environmentally acceptable cement spacer that can be formulated using fresh water, seawater or saltwater for optimum drilling fluid removal by effective control of the spacers yield point
A water-based spacer that is not limited to drilling fluid type, rheological properties can be designed for specific applications, can displace leading drilling fluid while eroding the filter cake.
Spacer system developed for use at temperatures to 450°F (232.2°C), thermal stability of the extreme-temperature synthetic polymer allows modification of both the rheological properties and density at specific service temperatures.
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