Life Of Drillpipe

Gensmer reported the life of drillpipe within the Rocky Mountain region in terms of cumulative tube failures and cumulative drilled footage. He categorized the drillpipe into 3 groups. Group 1 was internally plastic coated drillpipe, group 2 was drillpipe operated with oxygen scavengers, and group 3 was bare drillpipe in normal mud. The figures show that the life of internally plastic coated drillpipe has a life of 200,000 to 250,000 drilled footage and that failures within 200 feet of the top of the collars dominate. He also wrote that about 90% of the failures were fatigue cracks and occurred within 17 inches of the upset area below the box and few failures were near the pin end.

Group 1 string failure rates (dashed line—uncoated string).

Group 1 string failure rates (dashed line—uncoated string).

O 2000 4000

Distance from top of collars (ft.)

O 2000 4000

Distance from top of collars (ft.)

Cumulative drilled footage (ft. x 1000)

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Homeowners Guide To Landscaping

Homeowners Guide To Landscaping

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