Method for ascertaining optimum location for well stimulation and/or perforation

Patent · Tue Feb 12 04:00:00 EST 1980

OSTI ID:5612018

Fertl, W H; Vaello, D B

A method is disclosed for the in situ examination of earth formations penetrated by a borehole to ascertain the optimum location along the length thereof for instituting well stimulation operations or, where the well is cased, the optimum location for perforating the casing. The method utilizes natural gamma ray logging to determine the optimum locations with the natural gamma ray radiation of the earth formation surrounding the borehole measured and the total measurement then separated into potassium-40, uranium, and thorium energy-band signals. A differential value is derived by subtracting the energy-band signal for either potassium or thorium from the energy-band signal for uranium, with the differential thereafter compared to a energy-level standard having a preselected magnitude. The optimum locations for perforating and/or instituting well stimulation operations will be those zones in which the differential exceeds the preselected energy level standard.

• Assignee: Dresser Industries Inc
• Patent Number(s): US 4187908
• OSTI ID: 5612018
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
440400 -- Well Logging Instrumentation
47 OTHER INSTRUMENTATION
ACTINIDES
ALKALI METAL ISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTS
GAMMA LOGGING
ISOTOPES
LIGHT NUCLEI
METALS
NATURAL RADIOACTIVITY
NUCLEI
ODD-ODD NUCLEI
OIL WELLS
POTASSIUM 40
POTASSIUM ISOTOPES
RADIOACTIVITY
RADIOACTIVITY LOGGING
RADIOISOTOPES
STIMULATION
THORIUM
URANIUM
WELL LOGGING
WELL STIMULATION
WELLS
YEARS LIVING RADIOISOTOPES