Chemical Washes & Cement Spacers

• Petrochem - Oil and Gas Chemical Wash Concentrate Powder & Liquid (P-CWC & P-CWL) is used to prepare chemical washes & cement spacers for fresh water and oil-base mud systems. They are available as a liquid and as a concentrate. This pre-flush system serves as a spacer between drilling fluid and the cement slurry that prevents mud gelation; which normally happens when cement contacts the drilling mud. A poor bond is created between the pipe and the formation because the cement slurry bypasses through the viscous gelled mud. P-CWC has a low viscosity and a zero yield point allowing the chemical to have a turbulent flow at very low pump rates. It is the viscosity eddies from the turbulent fluid that sweeps the side of the pipe and formation resulting in excellent mud removal. The end result of using this additive is a clean surface along the face of the casing and formation; thus increasing the chances of generating a good bond with the cement slurry and the pipe and foundation. Know the following when using this additive:
  • P-CWC does not make chemical wash compatible with oil-based mud 
  • P-NSL2 can help with compatibility when combined with P-CWC
  • Our chemical wash should have at least 10 minutes of contact time - Any less will not provide enough time for the viscosity components to clean the foundation and pipe surface of drilling mud
  • P-CWC is primarily used for mud removal and cement placement because it concentrates on not bonding cement slurries with dried mud. Clean metal pipes and foundations can grip to the metal thus not falling apart required additional cement slurry preparations. 

When prepping one barrel of chemical wash we recommend using:

• 41 gallons of water
• .03 gallon of P-AFAL with an anti-foam agent - circulate
• .50 gallon of P-CWC - circulate
• .25 gallon of P-CWFL - circulate
• .25 gallon of P-NSL2 for oil-based mud - circulate
• Do not mix additives together before adding water
• Add additional water if you can’t use P-CWFL and P-NSL2

• Petrochem - Laminar Flow Spacer Powder (P-LFS) is a water-based Laminar/plug flow spacer fluid used to the bottom-hole temperatures and are used ahead of cement slurries.  This spacer fluid separates the slurry and is designed to be compatible with oil-based drilling fluids. This cement spacer can be used in freshwater or seawater with a 37% salt ratio. P-LFS can be pre-hydrated in saltwater systems, but the salt must be added after complete hydration. It is recommended to add a weighting agent if needed. All spacers are designed to be a higher density and viscosity than the drilling mud. Understanding the following for cement spacers:
  • P-LFS is compatible with most water-based muds - However, compatibility tests with the mud and cement are strongly encouraged. 
  • Oil-based muds are recommended to use P-LFS with P-NSL2; which is a non-ionic surfactant, which will render the spacer compatible with the oil.
  • Increased temperatures will tend to thin the spacer fluid, but will not cause the gel structure to break as it will continue to support the solids.
  • The mixing equipment used for pre-hydrating must be clean of all mud contamination for best results
  • Do not pre-hydrate the P-LFS for more than a few hours before the job or a bactericide will be required to remedy the problem

• Petrochem - Mutual Solvent Liquid (P-MS) designed for the oil industry offers a wide range of capabilities and product benefits. P-MS can be used alone or with acrid, brine crude oil, and other hydrocarbon solvents. It also doesn’t contain hades or heavy metals that are known to break process equipment and refinery catalysts. The following are direct benefits of using this mutual solvent:
  • Water and Oil Solubilization
  • Solids Dispersions
  • Emulsion Destabilization
  • Water wetting in selected surfactant systems

• Petrochem - Cement Spacer Surfactant Liquid (P-NSL2) is a nonionic surfactant liquid that is pourable at low temperatures and is a highly effective wetting agent for acid-based stimulation fluids. P-NSL2 is also an excellent characteristic for leaving limestone and sandstone wet. This cement spacer is easily handled, dissolves easily in water, and can be mixed by agitation with air or paddles. This cement additive has many benefits and can help with the following situations:
  • Lowering injection pressures 
  • Improving the return of treating fluids
  • Reducing the surface and interfacial tensions of treating solutions
  • Acts as a foaming agent in air drilling operations
  • Cleaning wells that have been killed by water

Contact a Cement Additives Professional

At Petrochem, we are committed to making sure that the pipe and foundation have a great bond with cement slurries. Please contact a concrete additive supplier specialist when choosing the right chemical wash, cement spacer, and mutual solvents that interact with drilling operations, casing, piping, and formations. Petrochem is proud of offering multiple additives that can keep sandstone wet and remove heavy dried mud on cement that’s impacting drilling operations. Learn more about all of the products that make concrete slurries better for the oilfield industry.