Under a corrosive downhole environment, the completion of a well might be damaged if no precautions are taken. Pipe made of corrosion resistant alloys (C.R.A.) is used to minimize corrosion. An analysis of various corrosion mechanisms shows that the surface integrity is an important factor for corrosion prevention.

Conventional spider and elevator inserts cause die marks that support corrosion. A new developed gripping system distributes the required load equally onto a large number of small peaks, minimizing the indentation of each single peak.

Electrochemical investigations, the measurement of the surface indentations and microscopic analysis compare the effect of conventional dies and the new gripping system on C.R.A.-pipe.

Using the new gripping system, the surface integrity is not damaged and the corrosion potential is virtually eliminated.

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