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PULSED NEUTRON LOGGING SYSTEMS FOR DETECTING GAS ZONES Inventors :
| Content Provider | Semantic Scholar |
|---|---|
| Author | Smith, Harry Denman Dan, Mingjie Arnold |
| Copyright Year | 2017 |
| Abstract | (57) ABSTRACT An illustrative embodiment of the invention estimated methods and apparatus for producing inelastic neu tron scattering logs of earth formations surrounding a well borehole. The gamma rays emitted by nuclei of at least carbon, oxygen, silicon and calcium which are excited by inelastically scattered fast neutrons are ob served by energy separation and are individually logged as a function of borehole depth. The siliconf calcium and carbon/oxygen inelastic gamma ray counts ratios are also logged as a function of borehole depth. Low hydrogen content of the formations may be stimated by detecting a high count rate in each of the four energy windows and then by comparing the Si/Ca and C/O ratios in these regions to the Si/Ca and C/O ratios for a known water sand, the relative abun dance of limestone in the low hydrogen content for mations may be estimated thus distinguishing gas zones from water saturated low porosity limestone. 12 Claims, 4 Drawing Figures |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://patentimages.storage.googleapis.com/93/4c/bd/f5601de6fa00b9/US3780301.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
