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| Survey problems
 
| Survey problems
| * Getting good seat to measure pressure   
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|  
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* Getting good seat to measure pressure   
 
* Screen plugging with material in drilling mud
 
* Screen plugging with material in drilling mud
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| * Packer failure   
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|  
 +
* Packer failure   
 
* Depth determination
 
* Depth determination
  

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