Riserless Cementing

Riserless cementing in deep water typically presents shallow-flow zones in unconsolidated formations.  This can result in excessive washouts creating difficulties with mud conditioning and requiring large volumes for full cement coverage back to the sea floor. Additionally, there can be narrow pressure margins and drastic temperature differentials from surface to mudline to bottomhole. All of these challenges require not only reliable equipment and experienced personnel, but specialized fluid systems for competent cement placement to maximize casing support and isolation for drilling operations. Thus optimizing the slurry design and having a robust execution plan are important.

In order to minimize material costs and the expense of repeated trips to shore, use of the same cement for multiple sections is preferred.  This is often accomplished with the use of additive technology, like liquid additives and automated metering systems, to appropriately adjust the mechanical and chemical properties of the cement system on the spot.  This is economical for the operator and environmentally wise by minimizing discarding of un-used materials and supply transport to the vessel.

Riserless Cementing Challenges

Riserless Cementing Challenges If Unaddressed
Efficiency of logistics and materials availability.

Well development hindered by lack of materials.

Narrow pore pressure / fracture gradient margins (as low as 0.2 to 0.5 lbm/gal ) and unconsolidated formations.

Lost circulation; damage to or loss of wellhead due to shallow water flow or wellhead drops.

Cement hydration rate negatively influenced by low/variable seabed temperatures (including possible presence of gas hydrate deposits).

Lengthy wait-on-cement time becomes NPT and deprives operators of efficient rig costs.

 

Solutions for Riserless Cementing

Cement Systems

ZoneSeal® Isolation Process
A fully engineered zonal isolation process with automated controls to deliver the benefits of light-weight (foam) cement during placement and for the life of the well.
GasStop™ Cement
Performs effectively in wells with overpressured zones with the potential for fluid influx into the annulus through unset cement using specially tuned systems.
Tuned® Light Cement
Designed to perform effectively in wells with where loss of circulation with conventional weighted cement slurries might occur.

Additives

GLOPOINTS™ Beads
Effective tracer additive when visual confirmation of fluid returns is required for a riserless casing string.
Gel Modifier 750™ Anti Fluid Migration Additive
Gel Modifier 750™ anti-fluid migration additive helps prevent migration by reducing the gel structure of cement slurries and reducing transition times without negatively affecting the slurry viscosity, early strength, and thickening time.
HR®-6L Cement Retarder
A 40% active solution of a chemically modified lignosulfonate, can be used to retard the setting of all classes of cement and Pozmix® cement, can be used at temperatures up to 210°F (99°C), as a secondary effect HR-6L retarder acts as a slight dispersant.
SCR-100™ Retarder
A nonlignosulfonate cement retarder that helps simplify the design of thixotropic slurries.
HR®-4 Retarder
A low temperature calcium lignosulfonate retarder for intermediate wells with bottomhole circulating temperatures up to 170°F (77°C) that can be used to retard all types of cement and Pozmix® cements, as a secondary effect HR-4 retarder acts a slight dispersant
HR-800™ Cement Retarder
Non-lignin based cement retarder capable of retarding cement at bottomhole circulating temperatures between 80°F (27°C) and 220°F (104°C), HR-800 retarder provides good strength development and may be effective in water-extended slurries, long cement columns or cooler temperatures.
SCR-200L™ Cement Retarder
SCR-200L liquid retarder is a synthetic, nonhazardous cement retarder specifically for high-temperature designs in environmentally sensitive locations.
HR®-817 Cement Retarder
A non-lignin based, high-temperature retarder (220°F/104°C to 350°F/177°C) that is North Sea approved, an economical alternative to commonly used high-temperature retarders.
HR®-25 Cement Retarder
A high-temperature retarder/intensifier, can be used at bottomhole circulating temperatures ranging from 200°F (93°C) to >400°F (>204°C) with a primary retarder, used alone it can gel cement.
HR®-5 Retarder
A chemically modified lignosulfonate used to retard the setting of all classes of cement and Pozmix® cement, provides more predictable thickening times than HR-4 and can be used at bottomhole circulating temperatures up to 210°F (99°C), as a secondary effect HR-5 retarder acts as a slight dispersant
Halad®-413 Fluid-Loss Additive
Provides excellent fluid-loss control in high temperature wells, especially when used on densified slurries or slurries with high salt concentrations due to its dispersing properties.
Halad®-567 Fluid Loss Additive
A fluid-loss additive made from synthetic polymer technology which is compatible with salt, seawater, and CaCl2 and effective up to 350°F (176.7°C) without over-retarding at temperatures as low as 80°F (26.7°C); it is not a strong dispersant so it can be used in normal and heavyweight slurries.
Halad®-322 Fluid-Loss Additive
A fluid-loss additive designed for use in low-temperature wells (below 180°F or 82.2°C) to prevent retardation of compressive-strength development; acts as a dispersant as well.
DeepFX™-L Additive
DeepFX-L additive: A single additive to provide fluid-loss control and shorten transition time to help address shallow water flow concerns.
Halad®-344 Fluid Loss Additive
Helps control fluid loss is non-retarding, and is compatible with freshwater and seawater.
Halad®-600 LE+ Fluid Loss Additive
Helps control fluid loss in environmentally sensitive areas between 125°F (51.7°C) and 300°F (148.9°C), acts as a mild retarder, gel breaker, and dispersant.
CFR-8™ Cement Friction Reducer
Cement Friction Reducer – An environmentally acceptable cement friction-reducing additive that reduces apparent viscosity and improves the rheological properties of cement slurries which is compatible with saturated salt solutions and temperatures greater than 60°F (15.6°C).
Silicalite Cement Additive
Silica powder used to increase slurry volume, reduce density, and increase compressive strength.
Halad®-300L Fluid-Loss Additive
Designed to replace Halad-200L additive, it helps control fluid loss without breaking foamed cement structures and is effective from 100°F (37.8°C) and higher than 400°F (204.4°C).
Econolite™ Additive
Increases slurry volume, decreases density, and typically acts as an accelerator.
Hollow Glass Spheres (HGS)
Hollow glass spheres used to decrease slurry density.
GasCon 469™ Additive
A liquid extender additive designed to help increase slurry stability and control free water.
Microbeads™ Mineral Spheres Additive
Can help regulate the slurry density of a cement blend and improve compressive-strength development.

Design and Planning

iCem® Service
Runs various simulations according to specific wellbore architecture design data provided by the operator. Based on computational fluid dynamics and finite element analysis, the simulations help enable the evaluation and optimization of cement designs to specifically address the operational and long-term parameters of individual wells.

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  TitleНазвание  DateДата
Summary Summary Cementing Best Practice: Tuned Light Cement Rig Operations Sign in required
7-page Best Practice dated 2/14/04. Document contains special considerations required for Tuned Light Cement Blends with respect to (1) Bulk Blending, (2) Bulk Sampling, (3) Testing on Location, and (4) Slurry QC during the Job.
Summary Summary iCem Service - Laboratory Validation
The University of Adelaide in Australia was selected to assess the dynamic evolution of fluid concentration in the wellbore as a function of time. This flow visualization study assessed the dynamics of fluid-to-fluid displacmeent in eccentric annuli.
Summary Summary ZoneSeal Isolation Process and Foam Systems
The ZoneSeal Isolation Process helps ensure a stable, foamed slurry. The process includes a fully integrated automated system that adjusts nitrogen content to maintain constant density by accounting for increasing hydrostatic pressure with depth.
Summary Summary DeepFX-L Additive
DeepFX-L additive is a single additive to address two challenges designed to enable logistics efficiencies and to be blended with cementing systems to help address both shallow water flow and gas migration conditions.
Summary Summary Fresh Approach Pays Off -- Innovation of WellLock resin system
This article originally ran in the "Innovators" section of the March 2015 issue of Canada's "New Technology" Magazine. It features the development work toward what became WellLock resin by Dr. P. Jones.
Summary Summary GLOPOINTS™ Beads
Effective tracer additive when visual confirmation of fluid returns is required for a riserless casing string.
Summary Summary iCem® Service
Runs various simulations according to specific wellbore architecture design data provided by the operator. Based on computational fluid dynamics and finite element analysis, the simulations help enable the evaluation and optimization of cement designs to specifically address the operational and long-term parameters of individual wells.
Summary Summary FlexPlug® Lost Circulation Service
Quick and cost effective solution for stopping lost circulation in natural or induced fractures, vugs, channels in weak zones, or flowing over-pressured zones.
Summary Summary ZoneSeal® Isolation Process
A fully engineered zonal isolation process with automated controls to deliver the benefits of light-weight (foam) cement during placement and for the life of the well.
Summary Summary GasStop™ Cement
Performs effectively in wells with overpressured zones with the potential for fluid influx into the annulus through unset cement using specially tuned systems.
Summary Summary Riserless Cementing
Routine challenges associated with the riserless or top-hole sections involve low fracture gradients in these young, unconsolidated sands; low temperatures; and shallow drilling hazards such as shallow water flows or hydrate formations. These require not only reliable equipment and experienced personnel, but specialized fluid systems for competent cement placement to maximize casing support and isolation for drilling operations.
Summary Summary Gel Modifier 750™ Anti Fluid Migration Additive
Gel Modifier 750™ anti-fluid migration additive helps prevent migration by reducing the gel structure of cement slurries and reducing transition times without negatively affecting the slurry viscosity, early strength, and thickening time.
Summary Summary Tuned® Light Cement
Designed to perform effectively in wells with where loss of circulation with conventional weighted cement slurries might occur.
Summary Summary HR®-6L Cement Retarder
A 40% active solution of a chemically modified lignosulfonate, can be used to retard the setting of all classes of cement and Pozmix® cement, can be used at temperatures up to 210°F (99°C), as a secondary effect HR-6L retarder acts as a slight dispersant.
Summary Summary SCR-100™ Retarder
A nonlignosulfonate cement retarder that helps simplify the design of thixotropic slurries.
Summary Summary HR®-4 Retarder
A low temperature calcium lignosulfonate retarder for intermediate wells with bottomhole circulating temperatures up to 170°F (77°C) that can be used to retard all types of cement and Pozmix® cements, as a secondary effect HR-4 retarder acts a slight dispersant
Summary Summary HR-800™ Cement Retarder
Non-lignin based cement retarder capable of retarding cement at bottomhole circulating temperatures between 80°F (27°C) and 220°F (104°C), HR-800 retarder provides good strength development and may be effective in water-extended slurries, long cement columns or cooler temperatures.
Summary Summary SCR-200L™ Cement Retarder
SCR-200L liquid retarder is a synthetic, nonhazardous cement retarder specifically for high-temperature designs in environmentally sensitive locations.
Summary Summary HR®-817 Cement Retarder
A non-lignin based, high-temperature retarder (220°F/104°C to 350°F/177°C) that is North Sea approved, an economical alternative to commonly used high-temperature retarders.
Summary Summary HR®-25 Cement Retarder
A high-temperature retarder/intensifier, can be used at bottomhole circulating temperatures ranging from 200°F (93°C) to >400°F (>204°C) with a primary retarder, used alone it can gel cement.
Summary Summary HR®-5 Retarder
A chemically modified lignosulfonate used to retard the setting of all classes of cement and Pozmix® cement, provides more predictable thickening times than HR-4 and can be used at bottomhole circulating temperatures up to 210°F (99°C), as a secondary effect HR-5 retarder acts as a slight dispersant
Summary Summary Halad®-413 Fluid-Loss Additive
Provides excellent fluid-loss control in high temperature wells, especially when used on densified slurries or slurries with high salt concentrations due to its dispersing properties.
Summary Summary Halad®-567 Fluid Loss Additive
A fluid-loss additive made from synthetic polymer technology which is compatible with salt, seawater, and CaCl2 and effective up to 350°F (176.7°C) without over-retarding at temperatures as low as 80°F (26.7°C); it is not a strong dispersant so it can be used in normal and heavyweight slurries.
Summary Summary Halad®-322 Fluid-Loss Additive
A fluid-loss additive designed for use in low-temperature wells (below 180°F or 82.2°C) to prevent retardation of compressive-strength development; acts as a dispersant as well.
Summary Summary DeepFX™-L Additive
DeepFX-L additive: A single additive to provide fluid-loss control and shorten transition time to help address shallow water flow concerns.
Summary Summary Halad®-344 Fluid Loss Additive
Helps control fluid loss is non-retarding, and is compatible with freshwater and seawater.
Summary Summary Halad®-600 LE+ Fluid Loss Additive
Helps control fluid loss in environmentally sensitive areas between 125°F (51.7°C) and 300°F (148.9°C), acts as a mild retarder, gel breaker, and dispersant.
Summary Summary CFR-8™ Cement Friction Reducer
Cement Friction Reducer – An environmentally acceptable cement friction-reducing additive that reduces apparent viscosity and improves the rheological properties of cement slurries which is compatible with saturated salt solutions and temperatures greater than 60°F (15.6°C).
Summary Summary Silicalite Cement Additive
Silica powder used to increase slurry volume, reduce density, and increase compressive strength.
Summary Summary Halad®-300L Fluid-Loss Additive
Designed to replace Halad-200L additive, it helps control fluid loss without breaking foamed cement structures and is effective from 100°F (37.8°C) and higher than 400°F (204.4°C).
Summary Summary Econolite™ Additive
Increases slurry volume, decreases density, and typically acts as an accelerator.
Summary Summary Hollow Glass Spheres (HGS)
Hollow glass spheres used to decrease slurry density.
Summary Summary GasCon 469™ Additive
A liquid extender additive designed to help increase slurry stability and control free water.
Summary Summary Microbeads™ Mineral Spheres Additive
Can help regulate the slurry density of a cement blend and improve compressive-strength development.
Summary Summary Thermatek® Fluids
A new generation of chemical treatments used to provide engineered solutions when drilling or producing fractured, unconsolidated or watered out formations.
Summary Summary STEELSEAL® Lost Circulation Material
Resilient, dual composition carbon-based material that increases lubricity
Related Information

Related Information Дополнительная информация