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25.4 Existing Planned Well to be Avoided (Caging)
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pl nn d w lls g nlowp o y. E nu lly h pl nn dw llsc nno b d ll d s h slo s‘c g d’ nbyoh wells. It is worth including the trajectories of currently undrilled but planned wells into the program so that their positions can be considered when assessing the impact of a non-conformity to plan. In such cases, the client should be apprised of the risk to future well plans and his agreement to proceed be obtained in writing. Clearly it is best if all anticipated future well plans are included at the earliest stage.
Figure 113: ‘Caging’ for collision avoidance planning.
25.5 Separation Rules
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“as planned” centre to centre distance of the wells divided by the uncertainty as to their actual locations.
Figure 114: Graphic of separation factor calculation.
For most companies the rules will be similar to the following but in the absence of client guidelines the following should be adopted: 1. When the database is newly acquired or constructed, or when starting a new project a scan of all wells in the field must be conducted.
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