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    • 6. 发明专利
    • DE68903379T2
    • 1993-03-25
    • DE68903379
    • 1989-11-06
    • SCHLUMBERGER SERVICES PETROL
    • JASINSKI RAYMONDFLETCHER PHILIPVERCAEMER CLAUDE
    • E21B47/10E21B49/00G01N27/403G01N27/28
    • 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.
    • 7. 发明专利
    • DE68903379D1
    • 1992-12-10
    • DE68903379
    • 1989-11-06
    • SCHLUMBERGER SERVICES PETROL
    • JASINSKI RAYMONDFLETCHER PHILIPVERCAEMER CLAUDE
    • E21B47/10E21B49/00G01N27/403G01N27/28
    • 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.
    • 10. 发明专利
    • AT329133T
    • 2006-06-15
    • AT01402583
    • 2001-10-08
    • SCHLUMBERGER TECHNOLOGY BV
    • VERCAEMER CLAUDELAVAURE GILBERTGUILLOT DOMINIQUETHIERCELIN MARC
    • E21B33/134E21B33/138E21B33/14
    • A method of stabilising an unconsolidated zone (18) of a borehole, including the steps of: forming a region of the borehole having enlarged diameter (22) in the unconsolidated zone when compared to the adjacent region above; positioning a fluid-filled casing (26) in the borehole extending across the unconsolidated zone and into the adjacent region above, the liner having a pipe (28) extending therethrough into a lower portion and being connected to a cement supply at the surface; pumping cement from the surface inside the pipe so as to exit the liner at the lower portion and flow upwards to fill the annulus (44) formed between the outside of the liner and the borehole in the unconsolidated zone and to extend into the adjacent region above; withdrawing the pipe (28) from the casing while pumping fluid therethrough so as to maintain the liner substantially fluid-filled and to displace cement above the liner in the adjacent region; and drilling through the cement and liner in the unconsolidated zone after the cement has set to form a borehole of substantially similar diameter to that of the adjacent region above.