Shale is the problem water-based systems exist to solve. Clays hydrate and swell when exposed to water of the wrong chemistry, which causes hole enlargement, tight hole, bit balling and pack-offs. Inhibition works by changing the chemistry so the exchange that drives hydration is suppressed, through potassium ions, salinity, encapsulating polymers, glycols or amines, each with its own cost and performance profile.

Maintenance is continuous. Drilled solids dilute the inhibition, polymers degrade with temperature and shear, filtrate control additives are consumed, and contamination from cement and formation water shifts the chemistry. A water-based system left unmaintained for a day or two drills worse immediately, which is why the mud engineer's testing and treatment routine matters.

High temperature is the main limitation. Many polymers degrade above moderate temperatures, filtration control becomes difficult and rheology becomes hard to manage, which is where either specialised high temperature systems or a switch to oil-based fluid becomes necessary. This course covers the systems, the limits and the practice of running them well.

By the end of this training, participants will be able to:

• Assess water quality and specify make-up water treatment.
• Explain clay hydration, shale reactivity and inhibition mechanisms.
• Design inhibitive water-based systems for reactive formations.
• Select and formulate high performance water-based systems.
• Control density, rheology and solids in water-based fluids.
• Control filtration and select filtration additives.
• Diagnose and treat contamination in water-based systems.
• Assess high temperature stability and its limits.
• Plan mixing, maintenance and treatment programmes at the rig.
• Select water-based systems by application and control their cost.

The course is instructor-led. Fluid chemistry is explained from first principles and applied through formulation exercises and mud report interpretation. Participants diagnose problems from real test data and specify treatments. Field cases cover systems that performed well and systems that failed and why. Participants are encouraged to bring their own mud reports for discussion.

Organisations sending participants to this training will:

• Improve hole condition and reduce shale-related problems.
• Use water-based systems in applications where oil-based would otherwise be chosen.
• Reduce mud cost through better maintenance and treatment.
• Improve the technical oversight of mud contractors.
• Reduce waste volumes and disposal cost.

Participants will:

• Understand water-based mud chemistry in depth.
• Be able to design and formulate inhibitive systems.
• Be able to diagnose and treat fluid problems from test data.
• Understand high temperature limits and how to work within them.
• Be able to manage a water-based system through a well.

• Drilling fluids and mud engineers
• Drilling engineers
• Rig site supervisors
• Fluids service company technical staff
• Laboratory and technical services staff
• Graduate engineers in fluids roles

Upon successful completion of this training course, delegates will be awarded an official Certificate of Completion issued by the Petroleum Engineers Association (PEA), an ISO 9001:2015 certified training organization. The certificate carries 10 Credits and formally records the total learning hours completed.

Each certificate is signed by the Course Facilitator and the CEO of the Petroleum Engineers Association, and serves as verifiable proof of professional training that delegates can present to employers and professional bodies worldwide.