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Title: Formation resistivity measurements from within a cased well used to quantitatively determine the amount of oil and gas present

Abstract

Methods to quantitatively determine the separate amounts of oil and gas in a geological formation adjacent to a cased well using measurements of formation resistivity are disclosed. The steps include obtaining resistivity measurements from within a cased well of a given formation, obtaining the porosity, obtaining the resistivity of formation water present, computing the combined amounts of oil and gas present using Archie`s Equations, determining the relative amounts of oil and gas present from measurements within a cased well, and then quantitatively determining the separate amounts of oil and gas present in the formation. 7 figs.

Inventors:
Publication Date:
Research Org.:
Paramagnetic Logging Inc
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
489087
Patent Number(s):
US 5,633,590/A/
Application Number:
PAN: 8-214,648
Assignee:
ParaMagnetic Logging, Inc., Woodinville, WA (United States) PTO; SCA: 020200; 030200; PA: EDB-97:084264; SN: 97001799043
DOE Contract Number:
FG06-84ER13294
Resource Type:
Patent
Resource Relation:
Other Information: PBD: 27 May 1997
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; 03 NATURAL GAS; OIL WELLS; NATURAL GAS WELLS; RESISTIVITY LOGGING; OIL SATURATION; GAS SATURATION; WELL CASINGS; CALCULATION METHODS; ELECTRIC CONDUCTIVITY; POROSITY; RESERVOIR ROCK

Citation Formats

Vail, W.B. III. Formation resistivity measurements from within a cased well used to quantitatively determine the amount of oil and gas present. United States: N. p., 1997. Web.
Vail, W.B. III. Formation resistivity measurements from within a cased well used to quantitatively determine the amount of oil and gas present. United States.
Vail, W.B. III. 1997. "Formation resistivity measurements from within a cased well used to quantitatively determine the amount of oil and gas present". United States. doi:.
@article{osti_489087,
title = {Formation resistivity measurements from within a cased well used to quantitatively determine the amount of oil and gas present},
author = {Vail, W.B. III},
abstractNote = {Methods to quantitatively determine the separate amounts of oil and gas in a geological formation adjacent to a cased well using measurements of formation resistivity are disclosed. The steps include obtaining resistivity measurements from within a cased well of a given formation, obtaining the porosity, obtaining the resistivity of formation water present, computing the combined amounts of oil and gas present using Archie`s Equations, determining the relative amounts of oil and gas present from measurements within a cased well, and then quantitatively determining the separate amounts of oil and gas present in the formation. 7 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1997,
month = 5
}
  • Methods to quantitatively determine the separate amounts of oil and gas in a geological formation adjacent to a cased well using measurements of formation resistivity are disclosed. The steps include obtaining resistivity measurements from within a cased well of a given formation, obtaining the porosity, obtaining the resistivity of formation water present, computing the combined amounts of oil and gas present using Archie's Equations, determining the relative amounts of oil and gas present from measurements within a cased well, and then quantitatively determining the separate amounts of oil and gas present in the formation.
  • Methods to quantitatively determine the separate amounts of oil and gas in a geological formation adjacent to a cased well using measurements of formation resistivity. The steps include obtaining resistivity measurements from within a cased well of a given formation, obtaining the porosity, obtaining the resistivity of formation water present, computing the combined amounts of oil and gas present using Archie's Equations, determining the relative amounts of oil and gas present from measurements within a cased well, and then quantitatively determining the separate amounts of oil and gas present in the formation. Resistivity measurements are obtained from within the casedmore » well by conducting A.C. current from within the cased well to a remote electrode at a frequency that is within the frequency range of 0.1 Hz to 20 Hz.« less
  • A.C. current is conducted through geological formations separating two cased wells in an oil field undergoing enhanced oil recovery operations such as water flooding operations. Methods and apparatus are disclosed to measure the current leakage conducted into a geological formation from within a first cased well that is responsive to fluids injected into formation from a second cased well during the enhanced oil production activities. The current leakage and apparent resistivity measured within the first cased well are responsive to fluids injected into formation from the second cased well provided the distance of separation between the two cased wells ismore » less than, or on the order of, a Characteristic Length appropriate for the problem.« less
  • A.C. current is conducted through geological formations separating two cased wells in an oil field undergoing enhanced oil recovery operations such as water flooding operations. Methods and apparatus are disclosed to measure the current leakage conducted into a geological formation from within a first cased well that is responsive to fluids injected into formation from a second cased well during the enhanced oil production activities. The current leakage and apparent resistivity measured within the first cased well are responsive to fluids injected into formation from the second cased well provided the distance of separation between the two cased wells ismore » less than, or on the order of, a Characteristic Length appropriate for the problem.« less
  • Methods of operation of an apparatus having at least two pairs of voltage measurement electrodes vertically disposed in a cased well to measure the resistivity of adjacent geological formations from inside the cased well. During stationary measurements with the apparatus at a fixed vertical depth within the cased well, the invention herein discloses methods of operation which include a measurement step and subsequent first and second compensation steps respectively resulting in improved accuracy of measurement. First and second order errors of measurement are identified, and the measurement step and two compensation steps provide methods to substantially eliminate their influence onmore » the results. A multiple frequency apparatus adapted to movement within the well is described which simultaneously provide the measurement and two compensation steps.« less