Primary Cementing Overview & Calculation
Review purposes of primary cementing, typical cementing procedures including conventional plug cementing, thru-tubing, and two-stage cementing. Liner cementing, subsea wellhead cementing considerations, mixing equipment and casing hardware.
Fundamental information regarding the manufacture, hydration and classification of Portland cements. Evaluation of the effects of various chemical and physical parameters on performance.
Mechanism of action and use of different categories of cementing additives – accelerators, retarders, extenders, weighting agents, dispersants, fluid-loss additives, lost circulation control agents, and speciality additives – to improve and reduce job costs.
Rheology and Mud Removal
Review of rheological models used in cementing – Newtonian, Bingham Plastic, Power Law and Herschel Bulkley. Effective mud removal criteria. Displacement selection in laminar and turbulent flow; application of washes and weighted spacers.
Importance of stand-off.
Gas Migration Control
Consequences of gas migration, gas migration paths, root causes for gas migration, gas-migration-control slurries.
Overview of API Schedules, heat transfer in a well, software temperature module, temperature in deep-water conditions, static temperature determination, misuse of temperature from MWD/LWD tools, TOC temperature evaluation.
Cement Laboratory (scheduling dependent on lab availability)
Performance evaluation of slurries and equipment used to evaluate thickening time, rheology, fluid-loss, free water, compressive strength, and slurry stability.
Applications (when to use), squeeze techniques – high and low pressure, running and hesitation techniques, squeeze tools, slurry design and volume estimation, injection test, downhole tools, conventional and coiled tubing placement.
Applications, plug placement, plug location, slurry volumes, plug balancing, avoiding Contamination.
- Equipment Overview
- Quality Control
Closing comments and discussions