Spacers and Flushes

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.

PHPA™ Preflush
An oxidant that helps break up highly gelled muds for easier displacement, breaks down the backbone of polymers and reduces the effect of gelation.
Mud Flush™ III Powder
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.
Attapulgite™ Additive
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.
Tuned® Spacer III Cement Spacer
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.
Dual Spacer™ system
Low viscosity, weighted spacer for primary and secondary cementing operations, can also be designed to displace water-based or oil-based muds.
Dual Spacer™ E Spacer
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).
Tuned® Spacer E+ Cement Spacer
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
Tuned™ Spacer Cement Spacer
Uses optimized rheology control to more thoroughly displace the drilling fluid.
CleanSpacer™ III Spacer Fluid
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.
Super Flush™ Additive
A reactive fluid flush used before primary cementing to help improve mud displacement and cement bonding and helps control downhole fluid loss.
Tuned® Spacer V Cement Spacer
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.

Spacers and Flushes

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Summary Summary Spacer Tech Sign in required
The variable-viscosity, optimized-rheology spacer lowers drilling costs through shorter rig time and recovery of drilling fluids. In one notable application, the use of a variable-viscosity, optimized-rheology (VVOR) spacer enabled an operator to save $150,000 on rig time and recover usable drilling fluid. Avoidance of remedial cementing saved from $15,000 to $100,000. A successful well completion demands the satisfaction of a number of criteria, one of which is the effective placement of cement. The main purposes of primary cementing are to create a secure bond with the pipestring and formation in order to strengthen both, supply zonal isolation from formation fluids by sealing the annulus, and protect the casing from corrosion.
Summary Summary Spacer Tech Saves Sign in required
In one notable application, the use of a variable-viscosity, optimized-rheology (VVOR) spacer enabled an operator to save $150,000 on rig time and recover usable drilling fluid. Avoidance of remedial cementing saved from $15,000 to $100,000.
Summary Summary NEA-96M™ surfactant
NEA-96M™ surfactant is a general surfactant and nonemulsifier for preflushes, acid preflushes, HCl and HF acid systems, overflushes, and fracturing fluids.
Summary Summary Pen-88™ nonionic blend of solvents and surfactants
Pen-88™ is a nonionic blend of solvents and surfactants that forms a microemulsion, a stable dispersion that will not separate into mutually insoluble phases, when added to an acid or non-acid fluid.
Summary Summary SSO-21MW agent
SSO-21MW agent is a foaming surfactant that provides improved water recovery in low permeability gas wells, such as shale or coal beds.
Summary Summary D-Crude 1™ surfactant
D-Crude 1™ surfactant helps disperse and remove crude oil and other petroleum-based fluids from refinery equipment and pipelines.
Summary Summary AQF-2™ Foaming Agent
AQF-2™ anionic surfactant and foaming agent is used to stabilize the gas and liquid levels of foamed fracturing fluids.
Summary Summary AS-7™ Surfactant/Antisludging Agent
AS-7™ nonionic surfactant functions as an antisludging agent in acid solutions. AS-7 surfactant may act as a chemical barrier between asphaltene particles and acid, helping prevent the precipitation of acid sludge.
Summary Summary LoSurf-2000S™ Surfactant
LoSurf-2000S™ surfactant is a solid, powder surfactant. It is a blend of anionic nonemulsifier and an anionic hydrotrope. LoSurf-2000S surfactant can be used as a surface-tension reducer and nonemulsifier in fracturing and acidizing applications.
Summary Summary Tuned® Spacer III Ultra HT spacer fluid
Tuned® Spacer III Ultra HT spacer fluid is designed especially for high temperature applications between 300°F (149°C) and 450°F (232°C). The spacer’s rheological properties (viscosity and yield point) can be designed for specific application in individual well conditions.
Summary Summary CleanSpacer III Spacer Fluid
Environmentally-safe, biodegradable spacer helps optimize wellbore preparation
Summary Summary BridgeMaker™ Family of LCM Spacer Fluids
The BridgeMaker™ Family of LCM spacer fluid is designed to overcome lost circulation while preparing the wellbore to receive cement. This family of spacer fluids represent an environmentally friendly blend of carefully selected materials.
Summary Summary Tuned Spacer E+ - A4
Tuned Spacer E+(TM) cement spacer for optimum drilling fluid removal helps meet the industry's need for more environmentally acceptable products. Tuned Spacer E+ was developed around the erodibility concept.
Summary Summary Tuned Spacer E+
Tuned Spacer E+(TM) cement spacer for optimum drilling fluid removal helps meet the industry's need for more environmentally acceptable products. Tuned Spacer E+ was developed around the erodibility concept.
Summary Summary Dual Spacer Surfactant A
Dual Spacer Surfactant A system is to be used as a supplementary additive when oil-based muds are displaced. It is designed to reduce interfacial viscosity and preferentially water-wet the pipe and formation to promote better cement bonding.
Summary Summary Dual Spacer Surfactant A
Dual Spacer Surfactant A system is to be used as a supplementary additive when oil-based muds are displaced. It is designed to reduce interfacial viscosity and preferentially water-wet the pipe and formation to promote better cement bonding.
Summary Summary Tuned® Spacer V
Tuned® Spacer V was developed for use at temperatures to 485-degrees Fahrenheit (251.7-degrees Celsius). It is an optimized rheology spacer that meets the challenge of high bottomhole temperatures.
Summary Summary Dual Spacer System ,CFR-6 Cement Friction Reducer
Dual Spacer system's primary application is as a low-viscosity, weighted spacer (flush) for primary and secondary cementing operations. Dual Spacer system can also be designed to displace water- and oil-based muds.
Summary Summary CleanBore A Surfactant - A4
The CleanBore system consists of four fluids that help provide quick and effective cleanout of oil-based mud (OBM) so that perforating or production in completion operations can begin.
Summary Summary Super Flush
Super Flush spacer is a reactive fluid flush used before primary cementing to help improve mud displacement and cement bonding. It also helps control downhole fluid loss.
Summary Summary Dual Spacer (Russian)
Dual Spacer in Russian
Summary Summary Dual Spacer Mixing Aid
The Dual Spacer™ Mixing Aid additive is a light brown liquid gel disposed in a low-toxicity oil.
Summary Summary Dual Spacer E Spacer (Russian)
Dual Spacer E spacer functions as a low-viscosity, weighted flush for primary and secondary cementing operations.
Summary Summary Dual Spacer System A4
Dual Spacer system's primary application is as a low-viscosity, weighted spacer (flush) for primary and secondary cementing operations. Dual Spacer system can also be designed to displace water- and oil-based muds.
Summary Summary CleanBore A Surfactant
The CleanBore system consists of four fluids that help provide quick and effective cleanout of oil-based mud (OBM) so that perforating or production in completion operations can begin.
Summary Summary Dual Spacer™ B Surfactant
Dual Spacer™ B surfactant is commonly used in water-based spacers to water-wet casing and help displace oil-based drilling fluids from the wellbore.
Summary Summary Dual Spacer™ B Surfactant - A4
Dual Spacer™ B surfactant is commonly used in water-based spacers to water-wet casing and help displace oil-based drilling fluids from the wellbore.
Summary Summary Tuned Spacer™ Material
Tuned Spacer™ Material is a cost-effective, water-based spacer that can provide variable viscosity and optimized rheology. For material #'s 12219 (blend) and 100009902 (dispersant). Used in Congo April 2018
Summary Summary CleanBore B™
The CleanBore system consists of four fluids that help provide quick and effective cleanout of oil-based mud (OBM) so that perforating or production in completion operations can begin.
Summary Summary Dual Spacer™ Mixing Aid A-4
Dual Spacer Mixing Aid additive is a lightbrown liquid gel disposed in a low-toxicity oil. It minimizes solids setting, which frequently occurs when Dual Spacer system is mixed in a low-sheer environment, such as an offshore sludging pit.
Summary Summary Stabilizer 434D™ Surfactant
Stabilizer 434D™ surfactant for latex cements is used to stabilize Latex 2000™ cement. Latex 2000 cement is a water-internal, oil-external emulsion; in the presence of water, the system tends to come out of emulsion, losing its effectiveness against gas migration. Stabilizer 434D surfactant helps prevent the de-emulsification of Latex 2000 cement.
Summary Summary SEM-8 Surfactant
Because SEM-8 surfactant acts as a degreaser, it promotes cement bonding, as well as helping to assure rheological compatibility between the wash/spacer and either oil-based (OBM) or synthetic-based (SBM) muds. That makes it ideal for use in chemical washes and spacers that come into contact with the OBM/SBM.
Summary Summary SEM-8 Surfactant - A4
Because SEM-8 surfactant acts as a degreaser, it promotes cement bonding, as well as helping to assure rheological compatibility between the wash/spacer and either oil-based (OBM) or synthetic-based (SBM) muds. That makes it ideal for use in chemical washes and spacers that come into contact with the OBM/SBM.
Summary Summary MF-1™Cement Thinner
A white, crystalline powder that can be combined with Morflo® III surfactant to create Mud Flush aqueous solution, helps prevent and break emulsions and water blocks.
Summary Summary PHPA™ Preflush
An oxidant that helps break up highly gelled muds for easier displacement, breaks down the backbone of polymers and reduces the effect of gelation.
Summary Summary Mud Flush™ III Powder
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.
Summary Summary Dual Spacer™ Mixing Aid Additive
Increases viscosity in the Dual Spacer system.
Summary Summary Attapulgite™ Additive
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.
Summary Summary Tuned® Spacer III Cement Spacer
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.
Summary Summary Dual Spacer™ system
Low viscosity, weighted spacer for primary and secondary cementing operations, can also be designed to displace water-based or oil-based muds.
Summary Summary Dual Spacer™ E Spacer
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).
Summary Summary Tuned® Spacer E+ Cement Spacer
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
Summary Summary Spacers and Flushes
Spacers and preflushes separate cement slurry and drilling mud by displacing drilling fluid from the annulus and acting as a barrier between the two, improving the odds of returning uncontaminated mud to the surface and achieving a solid cement job.
Summary Summary Tuned™ Spacer Cement Spacer
Uses optimized rheology control to more thoroughly displace the drilling fluid.
Summary Summary CleanSpacer™ III Spacer Fluid
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.
Summary Summary Super Flush™ Additive
A reactive fluid flush used before primary cementing to help improve mud displacement and cement bonding and helps control downhole fluid loss.
Summary Summary Dual Spacer™ Surfactant B
A surfactant commonly used in water-based spacers to water-wet casing and help displace oil-based drilling fluids from the wellbore, can be used at temperatures up to 500°F (260°C) when used in a properly designed blend of surfactants.
Summary Summary Musol® A Solvent
A mutual solvent that is used for increasing oil/water compatibility.
Summary Summary SEM-8™ Emulsifier
A surfactant that acts as a degreaser, promotes cement bonding and helps to assure rheological compatibility between the wash/spacer and either oil-based (OBM) or synthetic-based (SBM) muds.
Summary Summary Surfactants
Spacers and Flushes
Summary Summary Dual Spacer™ Surfactant A
Helps improve spacer performance when displacing oil-based mud systems, reduces interfacial viscosity and helps water-wet casing and formation.
Summary Summary Morflo® III Surfactant
A versatile blend of anionic and nonionic surfactants that can be used to treat both sandstone and carbonate formations, performs exceptionally well at de-oiling and aids with the dispersion of solids from water-based drilling fluids
Summary Summary Tuned® Spacer V Cement Spacer
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.
Summary Summary CleanBore B™ Surfactant
Part of the CleanBore system, a surfactant that is added to the spacer pill to enhance the cleanout of oil substrates through an ultra-low interfacial tension, helps leave the pipe and formation in a water-wet condition, provides effective wellbore cleaning and is environmentally friendly.
Summary Summary CleanBore A™ Surfactant
Part of the CleanBore™ system, a surfactant that is added to the spacer pill to enhance the cleanout of oil substrates through an ultra-low interfacial tension, helps leave the pipe and formation in a water-wet condition, is applicable over a wide temperature range and is environmentally friendly.
Summary Summary SEM-7™ Emulsifier
An emulsifier is designed to keep sandstone formations and proppant in a water-wet condition.
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