Mr. Erik Milito - The House Committee on Natural Resources ...

78 API STANDARD 65-2
Critical Drilling fluid Removal Parameters
Displacing the drilling fluid during the cementing operation is one of the most important factors in isolating a potential flow zone.
Poor drilling fluid displacement will jeopardize the ability to isolate potential flow zones.
Centralization
Mixing and
Placement Rate
Spacer
Fluid Compatibility
Circulation Volume
Rheology
Wiper Plugs
Pipe Movement
Annular Volume
Determination
Centralizer placement simulations shall be performed in order to best facilitate the installation of a cement
barrier element.
Have the centralizer simulator results been considered during the cementing design and execution within
the constraints imposed by hydraulic, operational, logistical or well architecture limitations
Have placement rates during cementing been modeled and designed to achieve the best possible drilling
fluid removal
Has the spacer been modeled and designed to achieve the best possible drilling fluid removal
Has the spacer been tested for compatibility with drilling fluid and cement according to API RP 10B-2/ISO
10426-2
When using NAF, has the spacer composition been optimized for wettability according to API RP 10B-2/
ISO 10426-2
As a minimum, does the pre-cementing circulating plan account for actual well conditions
— Drilling fluid conditioning and mobility.
— Gas in excess of background levels.
— Wellbore cooling.
— Lost circulation/ballooning.
— Confirm float equipment is free of obstruction.
— Hole stability.
Has altering the drilling fluid’s static and dynamic properties after drilling the section containing the potential
flow zone been considered to improve drilling fluid displacement efficiency and/or ECD management
Do the fluids’ rheological profiles provide a friction pressure hierarchy appropriate for effective drilling fluid
removal
If possible, are top and bottom wiper plugs used
Has pipe movement been considered
Has consideration been given for how the open hole volume will be determined