Measuring and testing – Borehole or drilling – Downhole test
Patent
1989-11-28
1991-04-09
Myracle, Jerry W.
Measuring and testing
Borehole or drilling
Downhole test
324370, E21B 4700
Patent
active
050054066
ABSTRACT:
In the rotary drilling of oil wells a drilling mud is used both to transport the cuttings up to the surface and to impose an hydrostatic pressure on the walls of the borehole. For these functions the mud must for example have an acceptable density and viscosity. It is therefore important to monitor the characteristics of the mud, and to keep them within certain limits. The technique proposed involves the use of an ion selective/reference electrode pair to measure in the mud the potential of the selected ion (as a potential difference), and thus allow a determination of that ion's concentration. Thus, it is a method in which, using a selective/reference electrode pair where the reference electrode is of the type having a liquid junction via an aperture within the reference electrode containment vessel, there is determined the potential difference generated by, and thus the concentration of, the ion in the mud. However, the nature of drilling mud is such that some undesirable interaction between the mud components and the reference electrode occurs, possibly leading to erroneous results. The invention suggests that this problem can be dealt with if, during the determination, the electrolyte constituting the reference electrode' s liquid junction is caused to flow through the electrode containment vessel's aperture and out of the vessel into the mud.
REFERENCES:
patent: 4154659 (1979-05-01), Zetter
patent: 4904603 (1990-02-01), Jones et al.
"Influence of Colloidal Charge on Response of pH and Reference Electrodes: The Suspension Effect", Pergamon Press, by Donald P. Brezinski.
"Ion-selective Electrodes", Cambridge University Press, by Jiri Koryta et al.
"A System for Continuous On-site Measurement of Sulfides in Water-base Drilling Muds", SPE-6664, by David M. Hadden.
"Reference Electrodes with Free-flowing Free-diffusion Liquid Junction", Analytical Chemistry, 1986, 58, 2585-2589, by Rene E. Dohner et al.
Fletcher Philip
Jasinski Raymond
Vercaemer Claude
DuPont Henri
Myracle Jerry W.
Ryberg John J.
Schlumberger Technology Corporation
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