What are the causes of drilling failure?

The most prevalent drilling problems include pipe sticking, lost circulation, hole deviation, pipe failures, borehole instability, mud contamination, formation damage, hole cleaning, H2S-bearing formation and shallow gas, and equipment and personnel-related problems.

What are common problems in drilling of oil well?

The most prevalent drilling problems include:

• Pipe sticking.
• Loss of circulation.
• Hole deviation.
• Pipe failures.
• Borehole instability.
• Mud contamination.
• Formation damage.
• Hole cleaning.

What does the drilling mud viscosity affects?

Strictly speaking, the higher plastic viscosity generates higher resistance in mud which in turns will affect cutting lifting performance. The situation may be worsened by the increase of ultra-fine drill solids in the drilling fluid which causes incremental trend of plastic viscosity at constant mud weight.

What are the physical properties of drilling mud considered important during drilling of a potential reservoir?

Drilling muds have four basic properties that determine the behavior of the mud as a drilling fluid – viscosity, density, gel strength and filtration. Several other properties, although of lesser importance, need to be checked, especially if problems are anticipated or encountered.

Why is viscosity important in drilling fluids?

Drilling mud is used to assist the drilling of wellbore into the earth. The mud viscosity is another important property, as cuttings will settle to the bottom of the well if the viscosity is too low. Fluids that have shear thinning and elevated viscosities are efficient for wellbore cleaning.

What is the main function of viscosity of drilling fluid?

Most drilling muds are thixotropic (viscosity increase during static conditions). This characteristic keeps the cuttings suspended when the mud is not flowing during, for example, maintenance. Fluids that have shear thinning and elevated viscosities are efficient for hole cleaning.

What are the common faults of drill machine?

What are the most common injuries when using power tools?

According to the Occupational Safety and Health Administration (OSHA), some of the more common injuries caused by power tools include the following:

• Electric shock.
• Eye injuries.
• Puncture wounds and lacerations.
• Crushing injuries and amputations.
• Repetitive-use injuries.
• Hearing loss.

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