§ 16-13. Surface casing.

A. 

Surface casing shall be set a minimum of two hundred feet below the deepest fresh water zone found in the eight sections adjacent to the wellsite section. A resistivity and porosity electric log shall be run in the surface hole before surface pipe is set, a copy of which will be filed with the oil and gas inspector. Surface pipe shall have a centralizer on the shoe joint, a centralizer within fifty feet of the shoe joint and centralizers no more than two hundred feet apart above the second centralizer.

B. 

Surface pipe shall be cemented by attempting to circulate good cement to the surface by normal displacement practices. If cement cannot be circulated to the surface due to washed out hole or lost circulation, the existing cement shall not be over-displaced, and a plug shall be left in the bottom of the casing string to be drilled out once the surface is set. The remaining open hole behind the surface pipe shall be cemented by running a tubing string between the conductor string and surface pipe until the top of the cement is tagged. The remaining uncemented annular space will then be cemented until good cement is circulated to the surface.

C. 

Where an existing well is to be used as an injection or disposal site, the existing casing and cement shall be of such integrity and depth as to adequately and safely isolate fresh water producing zones from the seepage or bleeding of injection fluids or disposants. Where additional protective operations are undertaken to comply with this subsection, the oil and gas inspector shall be notified thereof sufficiently in advance in order for him to be present for such operations.