HT-OWC
High-Temperature Well Cement
Oil-well cements for elevated bottom-hole static temperature (BHST) — typically API Class H base with silica flour or specialty HT formulations for deep and high-temperature intervals.
Application
Primary cementing of production and liner strings in wells with BHST above standard Class G envelope, typically from ~110 °C and higher depending on design. Class H with 35–40% silica flour is standard practice for stabilising strength retrogression. Specialty blended HT cements may be specified by operator.
Technical characteristics (quality certificate)
Typical values as stated on a mill quality certificate (passport) for a standard commercial grade. Actual lot values are confirmed in the COA / TDS for the selected manufacturer.
Base cement class
Class H (+ silica flour typical)
API 10A / ISO 10426-1
BHST range
Per cement system
API 10A / field design
Silica flour addition
35–40% BWOC (typical HT design)
API RP 10B-2 / operator SOP
Compressive strength (24 h at BHST, min)
Per slurry qualification
API RP 10B-2
Fluid loss (max)
Per slurry design with FLA
API RP 10B-2
Reference profile for orientation. For each supply we confirm grade, origin and certificate data against your specification, well conditions and delivery requirements.
Typical functions
- Thermal stability at BHST
- Strength retrogression control with silica
- Deep / HPHT interval cementing
Product information
- Chemical name
- High-temperature oil-well cement (Class H and specialty HT grades)
- Formula / class
- HT-OWC
- Appearance
- Grey cement powder; silica-modified systems supplied as separate components or pre-blended per supplier.
- Packaging
- Primarily 1.0 t MKR (FIBC) for base cement; 50 kg bags also available. Silica flour and additives packaged separately unless pre-blended.
HT cementing requires integrated slurry design: cement class, silica content, retarder, BHCT/BHST and waiting-on-cement time. Do not substitute Class G without full lab validation.
In this category
CTR
Cement Retarders
Additives that extend thickening time of oil-well cement slurries. Chemistry class must match temperature, cement type and slurry design.
Open product →FLA
Cement Fluid-Loss Additives
Additives that reduce API fluid loss of oil-well cement slurries to protect formation and maintain slurry properties during placement.
Open product →DSP
Cement Dispersants
Additives that reduce slurry viscosity and improve pumpability of oil-well cement at low water-cement ratios.
Open product →