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Title: Semiautomated method for cation-exchange capacity determination of reservoir rocks

Abstract

The presence of significant amounts of clay in tight-gas sand formations makes the determination of cation exchange capacities (CEC) important for electric-log, self potential (SP), and gamma ray log interpretation. In the past, CEC measurements have been difficult and time-consuming to obtain. However, an automated method that avoids many difficulties of other techniques while determining the CEC's of many samples at one time has been described by Worthington. This work is a modification of the work done by Worthington. Easily assembled commercial equipment instead of specially built equipment is used to agitate rock samples contained in dialysis membrane bags during ion exchange with barium acetate solution and during washing of the samples to remove excess barium ions. Barium acetate is used as the source of barium ions instead of barium chloride, which is used in Worthington's procedure, to avoid corrosion of the stainless steel equipment. The amount of barium ions on the rock samples is then determined by conductometric titration with magnesium sulfate. The titration procedure is not automated. In addition, the use of the barium ion method was extended to samples with CEC values an order of magnitude lower than those determined by Worthington.

Authors:
; ;
Publication Date:
Research Org.:
U.S. DOE
OSTI Identifier:
5500259
Resource Type:
Journal Article
Resource Relation:
Journal Name: Soc. Pet. Eng. AIME, Pap.; (United States); Journal Volume: 23:2
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; RESERVOIR ROCK; ION EXCHANGE; PERMEABILITY; SANDSTONES; ABSORPTION; ACETATES; AMMONIUM COMPOUNDS; AUTOMATION; BARIUM COMPOUNDS; CORROSION; DIALYSIS; ELECTRIC LOGGING; GAMMA LOGGING; MAGNESIUM SULFATES; SP LOGGING; STAINLESS STEELS; TITRATION; WATER; ALKALINE EARTH METAL COMPOUNDS; ALLOYS; CARBOXYLIC ACID SALTS; CHEMICAL REACTIONS; CHROMIUM ALLOYS; CORROSION RESISTANT ALLOYS; HYDROGEN COMPOUNDS; IRON ALLOYS; IRON BASE ALLOYS; MAGNESIUM COMPOUNDS; OXYGEN COMPOUNDS; RADIOACTIVITY LOGGING; ROCKS; SEDIMENTARY ROCKS; SEPARATION PROCESSES; STEELS; SULFATES; SULFUR COMPOUNDS; WELL LOGGING; 020200* - Petroleum- Reserves, Geology, & Exploration

Citation Formats

Gall, B.L., Raible, C.J., and Volk, L.J. Semiautomated method for cation-exchange capacity determination of reservoir rocks. United States: N. p., 1983. Web. doi:10.2118/9873-PA.
Gall, B.L., Raible, C.J., & Volk, L.J. Semiautomated method for cation-exchange capacity determination of reservoir rocks. United States. doi:10.2118/9873-PA.
Gall, B.L., Raible, C.J., and Volk, L.J. 1983. "Semiautomated method for cation-exchange capacity determination of reservoir rocks". United States. doi:10.2118/9873-PA.
@article{osti_5500259,
title = {Semiautomated method for cation-exchange capacity determination of reservoir rocks},
author = {Gall, B.L. and Raible, C.J. and Volk, L.J.},
abstractNote = {The presence of significant amounts of clay in tight-gas sand formations makes the determination of cation exchange capacities (CEC) important for electric-log, self potential (SP), and gamma ray log interpretation. In the past, CEC measurements have been difficult and time-consuming to obtain. However, an automated method that avoids many difficulties of other techniques while determining the CEC's of many samples at one time has been described by Worthington. This work is a modification of the work done by Worthington. Easily assembled commercial equipment instead of specially built equipment is used to agitate rock samples contained in dialysis membrane bags during ion exchange with barium acetate solution and during washing of the samples to remove excess barium ions. Barium acetate is used as the source of barium ions instead of barium chloride, which is used in Worthington's procedure, to avoid corrosion of the stainless steel equipment. The amount of barium ions on the rock samples is then determined by conductometric titration with magnesium sulfate. The titration procedure is not automated. In addition, the use of the barium ion method was extended to samples with CEC values an order of magnitude lower than those determined by Worthington.},
doi = {10.2118/9873-PA},
journal = {Soc. Pet. Eng. AIME, Pap.; (United States)},
number = ,
volume = 23:2,
place = {United States},
year = 1983,
month = 4
}
  • The presence of significant amounts of clay in tight-gas sand formations makes the determination of cation exchange capacities (CEC) important for electric-log, self potential (SP), and gamma ray log interpretation. In the past, CEC measurements have been difficult and time-consuming to obtain. However, an automated method that avoids many difficulties of other techniques while determining the CEC's of many samples at one time has been described by Worthington. This work is a modification of the work done by Worthington. Easily assembled commercial equipment instead of specially built equipment is used to agitate rock samples contained in dialysis membrane bags duringmore » ion exchange with barium acetate solution and during washing of the samples to remove excess barium ions. Barium acetate is used as the source of barium ions instead of barium chloride, which is used in Worthington's procedure, to avoid corrosion of the stainless steel equipment. The amount of barium ions on the rock samples is then determined by conductometric titration with magnesium sulfate. The titration procedure is not automated. In addition, the use of the barium ion method was extended to samples with CEC values an order of magnitude lower than those determined by Worthington. Most measured CEC's for the western tight-gas sands ranged from 0.5 to 10 meq/100 g with a few to 19 meg/100 g. A comparison of barium acetate, adsorbed water, and ammonium acetate methods for determining CEC's is made.« less
  • The combined use of cation exchange enrichment and spectrochemical analysis for the determination of rare earths in common silicate rocks is described. Rare earth elements are more strongly adsorbed by cation exchange resins than the abundant elements. hence the latter can be eluted with a concentration of acid which does not desorb the rare earths. The rare earths are then eluted by stronger hydrochloric acid and the effluent is evaporated to an amount of material sufficiently small to arc spectrographically. This procedure allowed the determination of Sc, Y, Nd, Ce and La in 13 South African granite rocks and Y,more » Nd, Ce and La in 6 South African basic rocks. (auth)« less
  • Fusion of Sr/sup 2+/saturated clay with K/sub 2/S/sub 2/O/sub 7/ resulted in a sample that lent itseif to the accurate determination of Sr/sup 2+/ by x-ray emission spectrometry. Matrix effects occasioned by variable clay composition were negligible. The method gave CEC values in close agreement with those obtained by Ca/sup 2+/-saturation. Details of the method are given. (P.C.R.)
  • An isotope method for the determination of cation exchange capacity (C.E.C.) in colloid soil material by means of Sr/sup 89/ is described. Results are reported on four different types of soil material, and comparisons are made between the isotope method and a flamephotometric determination of absorbed strontium. The effect on the observed C.E.C. values when CaCO/sub 3/ is added to the samples was studied for the isotope method. (auth)