Cost per meter drilled

Cost per hour of use

Score

Improvement (%)

Score

Improvement (%)

1

None (<0)

1

Low (0 - 25)

2

Low (0 - 25)

2

Medium (25 - 50)

3

Medium (25 - 50)

3

High (>50)

4

High (>50)

Availability

Accident rate

Score

Improvement (%)

Score

Improvement (%)

1

None < 0

1

Significant deterioration (>50)

2

Low (0 - 3)

2

Slight deterioration (0 - 50)

3

Medium (3 - 6)

3

Status quo (0)

4

High (>6)

4

Slight improvement (0 - 50)

5

Significant improvement (>50)