Wellbore Cleaners

At the end of drilling operations, but before the well completion, there is usually a requirement to displace the drilling fluid from the open hole and the cased-hole annulus. The displacement process will require a series of wellbore wash pills to be pumped. This is especially challenging in wells drilled using oil-based fluids: before placing production equipment downhole it is necessary to remove (as far as possible) solids and oil-mud contamination. Failure to do this will impair well productivity and shorten the lifespan of the completed well. Our wellbore cleaners are designed to displace drill cuttings, oil-mud residue and swarf.

A CLEAN WELLBORE DELIVERS IMPROVED PERFORMANCE

The BIO-ADD WBC series of products provide a range of effective one stage wellbore clean-up & displacement chemicals. Using a combination of powerful solvents capable of dissolving mud residues, together with a blend of surfactants to provide outstanding water-wetting of the metal surfaces, the BIO-ADD WBC range delivers all the functionality of a multi-stage displacement pill train within a single product.

SIMPLIFYING WELLBORE CLEANING

Our goal was to formulate a product line to provide both top -tier cleaning performance and have an excellent HSE profile that meets all current environmental requirements.  When incorporated in a suitable wellbore clean-up and displacement program, these components fulfil the roles of thinners, dissolvers, and dispersants of oil-based and synthetic-based drilling fluids, to leave all-metal casing, liners, and tubulars in the desired water-wet condition.

WELLBORE CLEANLINESS

BIO-ADD WBC will function in water, seawater, and brines. BIO-ADD WBC can be added to any high viscosity, or high density, push-pills pumped before or after the main clean-up pill. These wellbore cleaners are also excellent for use as rig cleaners (rigwash) and can be applied very efficiently using a heated high pressure washdown gun.

Please contact Shrieve to discuss which BIO-ADD WBC product best suit your needs.

BIO-ADD WBC 87

Using a combination of powerful solvents capable of dissolving mud residues, together with a blend of surfactants to provide outstanding water-wetting of the metal surfaces, BIO-ADD WBC 87 delivers all the functionality of a multi-stage displacement pill train within a single product. This combination of surfactants, solvents, and water-wetting agents provides first-class performance, and manages to achieve this while still having an excellent HSE profile. When incorporated in a suitable wellbore displacement program, these components fulfil the roles of thinners, dissolvers, and dispersants of oil-based and synthetic-based drilling fluids, to leave all metal casing, liners, and tubulars in the desired water-wet condition.

Applications for our wellbore cleaner

BIO-ADD WBC has been developed for use downhole in oil and gas wells to provide optimal wellbore clean-up during displacement of oil-based or synthetic-based drilling fluids to completion and packer fluids. Shrieve recommends concentrations of 5-20% (v/v) in the primary clean-up pill, pumped in turbulent flow. The combination chemistry in our BIO-ADD WBC 87 effectively removes all solids and drilling-fluid residue without the requirement for an additional surfactant wash.

BIO-ADD WBC 87 will function in water, seawater and brines. In static conditions the solvent may phase separate over time so mild agitation of the pill prior to pumping is desirable. BIO-ADD WBC can be added to any high viscosity, or high density, push-pills pumped before or after the main clean-up pill.

Required concentration of product will vary dependent on mud type and wellbore condition. Recommendations for a specific application should be made after consulting with Shrieve representatives.

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