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    • 4. 发明专利
    • WELLBORE ANTENNAE SYSTEM AND METHOD
    • CA2323654C
    • 2007-12-04
    • CA2323654
    • 2000-10-18
    • SCHLUMBERGER CA LTD
    • CIGLENEC REINHARTTABANOU JACQUES RSEZGINER ABDURRAHMAN
    • E21B7/06E21B23/00E21B47/00E21B47/12E21B49/00E21B49/10H01Q1/36
    • An apparatus and a method for controlling oilfield production to improve efficiency includes a remote sensing unit that is placed within a subsurface formation, an antenna structure for communicating with the remote sensing unit, a casing joint having nonconductive "windows" for allowing a internally located antenna to communicate with the remote sensing unit, and a system for obtaining subsurface formation data and for producing the formati on data to a central location for subsequent analysis. The remote sensing unit is placed sufficiently far from the wellbore to reduce or eliminate effects that the wellbore might have on formation data samples taken by the remote sensing unit. The remote sensing unit is an active devic e with the capability of responding to control commands by determining certain subsurface formatio n characteristics such as pressure or temperature, and transmitting corresponding data values to a wellbore tool. The inventive system includes an antenna structure that is for delivering power and communication signals to the remote sensing unit. In one embodiment, the antenna structure is formed on an external surface of a wellbore casing. In another embodiment, t he antenna structure is formed on a downhole tool such as a drilling collar or a cased hole wireline tool. For thoseembodiments in which the antenna structure is formed on a cased holed wireline tool, a casing joint is provided that includes nonconductive windows for allowing RF signals to be transmitted from within the casing to the remote sensing unit and from the remote sensing unit to the wireline tool. An inventive method therefore includes providing RF power through the inventive antenna system to the remote sensing unit to wake it up and to pla ce it into an operational mode. The method further includes receiving modulated data value s from the remote sensing unit through the antenna system that are then transmitted to the surface where operational decisions for the well may be made.
    • 7. 发明专利
    • WELLBORE ANTENNAE SYSTEM AND METHOD
    • CA2323654A1
    • 2001-04-28
    • CA2323654
    • 2000-10-18
    • SCHLUMBERGER CA LTD
    • TABANOU JACQUES RCIGLENEC REINHARTSEZGINER ABDURRAHMAN
    • E21B7/06E21B23/00E21B47/00E21B47/12E21B49/00E21B49/10
    • An apparatus and a method for controlling oilfield production to improve efficiency includes a remote sensing unit that is placed within a subsurface formation, an antenna structure for communicating with the remote sensing unit, a casing joint having nonconductive "windows" for allowing a internally located antenna to communicate with the remote sensing unit, and a system for obtaining subsurface formation data and for producing the formati on data to a central location for subsequent analysis. The remote sensing unit is placed sufficiently far from the wellbore to reduce or eliminate effects that the wellbore might have on formation data samples taken by the remote sensing unit. The remote sensing unit is an active devic e with the capability of responding to control commands by determining certain subsurface formatio n characteristics such as pressure or temperature, and transmitting corresponding data values to a wellbore tool. The inventive system includes an antenna structure that is for delivering power and communication signals to the remote sensing unit. In one embodiment, the antenna structure is formed on an external surface of a wellbore casing. In another embodiment, t he antenna structure is formed on a downhole tool such as a drilling collar or a cased hole wireline tool. For thoseembodiments in which the antenna structure is formed on a cased holed wireline tool, a casing joint is provided that includes nonconductive windows for allowing RF signals to be transmitted from within the casing to the remote sensing unit and from the remote sensing unit to the wireline tool. An inventive method therefore includes providing RF power through the inventive antenna system to the remote sensing unit to wake it up and to pla ce it into an operational mode. The method further includes receiving modulated data value s from the remote sensing unit through the antenna system that are then transmitted to the surface where operational decisions for the well may be made.
    • 10. 发明专利
    • RESERVOIR MONITORING THROUGH MODIFIED CASING JOINT
    • CA2316044C
    • 2005-06-07
    • CA2316044
    • 2000-08-16
    • SCHLUMBERGER CA LTD
    • ECKERSLEY CLIVE PCHOUZENOUX CHRISTIANTABANOU JACQUES RCIGLENEC REINHART
    • E21B7/06E21B23/00E21B23/14E21B33/13E21B47/01E21B47/024E21B47/12E21B49/00E21B49/10E21B47/00
    • An apparatus and a method for controlling oilfield production to improve efficiency includes a remote sensing unit that is placed within a subsurface formation, an antenna structure for communicating with the remote sensing unit, a casing joint having nonconductive "windows" for allowing a internally located antenna to communicate with the remote sensing unit, and a system for obtaining subsurface formation data an d for producing the formation data to a central location for subsequent analysis. The remote sensing unit is placed sufficiently far from the wellbore to reduce or eliminate effects tha t the wellbore might have on formation data samples taken by the remote sensing unit. The remote sensing unit is an active device with the capability of responding to control comman ds by determining certain subsurface formation characteristics such as pressure or temperature, and transmitting corresponding data values to a wellbore tool. Some embodiments of the remote sensing unit include a battery within its power supply. Other embodiments include a capacitor for storing charge. In order for a communication link to be established with the remote sensing unit through a wireline tool in a cased well, a casing joint includes at least one electromagnetic window that is formed of a non-conductive materialthat will allow electromagnetic signals to pass through it. In the preferred embodiment, the electromagnetic windows are formed to substantially circumscribe the casing joint to render it largely rotationally invariant. The electromagnetic windows are formed of any rigid and durable non-conductive material including, by way of example, either ceramics or fiberglass.