Some operations undertaken during the course of a well test will require good visibility in order to be carried out safely. Moreover, some operations which could be carried out without problems on offshore rigs, may not be possible on onshore rig sites where the overall site lighting may not be so good. Whenever possible, additional explosion proof lighting should be installed at onshore wellsites for testing operations.
Generally the following activities will become considerably more hazardous if carried out under low light conditions:
• Acidising and fracturing.
• High pressure pumping.
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