Granite Wash Casing Profile课件.ppt

Granite Wash Casing Profile Texas Panhandle (District 10) Western Oklahoma OKC Granite Wash Conference – March 6, 2008 精品文档 Surface Casing Regulations District 10 Office is located in Pampa, Texas Texas Railroad Commission - District 10 – Jan 1996 “Zone of Critical Cement” Bottom 20% of casing string with a minimum of 300 ft At multiple stage cementing tool – immediate 300 ft above tool Cement Blend Requirements Cement in the “Zone Of Critical Cement” must meet and/or exceed a compressive strength or 500 psi before drill out and 1,200 psi in 72 hrs Cement above the “Zone of Critical Cement” may contain extenders, however the cement must have a minimum compressive strength of 350 psi in 24 hrs after placement. Also the slurry weight cannot be less than 12.7 #/gal with an API free water of no more than 6 mls per 250 mls of cement according to API RP 10R test procedure 精品文档 Surface Casing Regulations District 10 Office is located in Pampa, Texas Texas Railroad Commission - District 10 – Jan 1996 Centralizers Surface casing string shall be centralized at the casing shoe If a multi-stage cementer is used, above and below the tool Plus 100 ft below the base of the usable quality water, a centralizer shall be placed every fourth joint to the ground surface or to the bottom of the cellar “Operators must notify the District Office in the event that the cement does not circulate to the ground surface” “A temperature survey or cement bond log well be required in the event that the cement is not circulated to the ground surface” 精品文档 Surface Casing Regulations Texas Railroad Commission - District 10 – Nov 2005 Maximum casing depth will not exceed 3500 ft Surface casing shall be set before drilling into known shallow oil and gas formations. “Zone of Critical Cement” Bottom 20% of casing string with a minimum of 300 ft From multiple stage cementing tool to the surface Cement Blend Requirements Cement in the “Z