摘要:
The invention provides a select trigger or detonation system featuring an optical source, an optical fiber, one or more optical couplers and one or more light trigger or detonation devices. The an optical source provides an optical signal containing information about triggering or detonating a respective device. The optical fiber has one or more fiber Bragg Gratings for providing one or more fiber Bragg Grating optical trigger or detonation signals, each having a respective optical trigger or detonation wavelength. The one or more optical couplers each respond to the one or more fiber Bragg Grating optical trigger or detonation signals depending on the respective optical trigger or detonation wavelength, for providing a respective coupled fiber Bragg Grating optical trigger or detonation signal. The one or more light trigger or detonation devices each respond to the respective coupled fiber Bragg Grating optical trigger or detonation signals, for triggering or detonating the respective device, which may detonating an explosive charge or triggering any other control device to be actuated. In one embodiment, the one or more optical couplers may include a circulation coupler or a directional coupler. The system may also be used as a monitoring system.
摘要:
A fiber optic sensor includes a sensor element responsive to a property or condition of a material, such a resistivity, capacitance, inductance, frequency, etc., for providing an output voltage signal that is dependent upon the property or condition of the material. The sensor further includes an optical-to-electrical conversion element, such as a photo detector or a solar cell, that converts an optical signal (photo detector driving optical signal) carried by an optical fiber into an electrical signal. The electrical signal is applied to the sensor element, and in response, the sensor element provides the output electrical signal. The output electrical signal is applied to a measurement device, such as a piezoelectric element, having at least one dimension that varies with changes in the output electrical signal. An optical strain sensor, such as a Bragg grating or Fabry Perot interferometer, is mounted to the measurement device such that changes in the dimension of the measurement device causes changes in the strain of the optical strain sensor. These changes in strain are detected and related to the property or condition of the material. The fiber optic sensor is particularly useful as a resistivity sensor for measuring the resistivity of a fluid. For example, the resistivity of a fluid mixture of oil and water can be measured for determining the relative water and oil content in the fluid mixture. In this configuration, the sensor element includes a pair of spaced apart conductive elements. The output electrical power from the photo detector is applied to the conductive elements and the fluid is passed between the conductive elements. The output voltage from the conductive elements varies in relation to the resistivity of the fluid sample between the conductive elements.
摘要:
A quartz sensing system includes a quartz sensor, an electromechanical converter, an optical source, an optical fiber and a signal processor. The quartz sensor responds to a pressure, and further responds to an electrical power signal, for providing a quartz sensor electrical signal containing information about the pressure. The electromechanical converter responds to the quartz sensor signal, for providing an electromechanical converter force containing information about the sensed voltage or current signal. The optical source for provides an optical source signal. The optical fiber responds to the electromechanical converter force, for changing an optical parameter or characteristic of the optical source signal depending on the change in length of the optical fiber and providing an electromechanical converter optical signal containing information about the electromechanical converter force. The signal processor responds to the electromechanical converter optical signal, for providing a signal processor signal containing information about the pressure. In one embodiment, the electromechanical converter includes a piezoelectric or magnetostrictive transducer that responds to the quartz sensor signal, for providing an piezoelectric or magnetostrictive transducer force containing information about the quartz sensor signal. In another embodiment, the electromechanical converter includes an acoustic transducer and a piezoelectric or magnetostrictive transducer. The acoustic transducer responds to the quartz sensor signal, for providing an acoustic transducer wave containing information about the quartz sensor signal. The piezoelectric or magnetostrictive transducer responds to the acoustic transducer wave, for providing a piezoelectric or magnetostrictive transducer force containing information about the acoustic transducer wave.
摘要:
The present invention provides a seismic sensing system having at least one sensor, transducer, optical source and detection unit, optical fiber and measurement unit. The sensor responds to a seismic disturbance, for providing a sensor signal containing information about the seismic disturbance. The sensor may be a geophone that detects vibrations passing though rocks, soil etc, and provides an electrical voltage sensor signal. The transducer responds to the sensor signal, for providing a transducer force containing information about the sensor signal. The transducer may be a piezoelectric, magnetostrictive or electrostrictive transducer. The optical source provides an optical signal through the fiber. The optical fiber responds to the transducer force, changes an optical parameter or characteristic of the optical signal depending on the change in length of the optical fiber, for providing a transduced optical signal containing information about the transducer force. The optical fiber may have one or more fiber Bragg Gratings therein arranged in relation to the transducer. The measurement unit responds to the transduced optical signal, for providing a measurement unit signal containing information about the seismic disturbance.
摘要:
The present invention provides a new and unique method, sensor, and apparatus for performing a seismic survey of an earth formation in relation to a borehole. The method includes arranging at least one strain seismic sensor in conjunction with a borehole structure, and mechanically coupling the borehole structure to the borehole to allow seismic data to be accurately transferred to the sensor. The sensor is preferably a fiber optic sensor, including a Fiber Bragg Grating which may be coupled to a relevant borehole structure in a number of ways.
摘要:
A steerable, magnetic dipole antenna for Measurement-While-Drilling (MWD) or Logging-While-Drilling (LWD) applications. The antenna elements use a hole arrangement in addition to grooves in a steel tool body, which is typically a drill collar. This antenna embodiment is extremely robust, meaning that does not significantly reduce the structural integrity of the tool body in which it is disposed. The antenna embodiment is also relatively wear resistant. The resultant magnetic dipole generated by this antenna is also electrically steerable in inclination angle from a common origin. A variable dipole moment inclination angle combined with independently measured tool rotation orientation during normal drilling allows the antenna to generate a magnetic dipole moment that may be directed at any three dimensional angle and from a common origin point at the centroid of the antenna. The antenna can also be embodied to be more sensitive to resitivity in a particular azimuthal direction.
摘要:
The present invention is directed to a method and apparatus for determining the dip angle and horizontal and vertical conductivities of a wellbore during drilling operations. If the dip angle is not known, the present invention allows for the use of multifrequency measurements and a model which maps dielectric permitivities to conductivities to calculate the horizontal conductivity, the vertical conductivity, the horizontal dielectric permitivity, the dielectric permitivity, and the dip angle. If the dip angle is known, the present invention allows a multifrequency tool to be utilized alone to calculate the horizontal conductivity, the vertical conductivity, the horizontal dielectric permitivity, and the vertical dielectric permitivity. I the dip angle is not known, a single frequency resistivity tool (as opposed to a multifrequency tool) can be utilized in combination with a model which maps dielectric permitivities to conductivities to calculate the horizontal conductivity and the horizontal dielectric permitivity.
摘要:
The invention is directed toward the elimination of the effects of electromagnetic coupling between pairs of receivers. The preferred embodiment encompasses the measurement of resistivity and other electromagnetic properties of earth formation in a borehole environment. The invention also incorporates techniques for eliminating the effects of receiver antenna drift and the effects of power variations of two or more transmitters.
摘要:
A steerable, magnetic dipole antenna for Measurement-While-Drilling (MWD) or Logging-While-Drilling (LWD) applications. The antenna elements use a hole arrangement in addition to grooves in a steel tool body, which is typically a drill collar. This antenna embodiment is extremely robust, meaning that does not significantly reduce the structural integrity of the tool body in which it is disposed. The antenna embodiment is also relatively wear resistant. The resultant magnetic dipole generated by this antenna is also electrically steerable in inclination angle from a common origin. A variable dipole moment inclination angle combined with independently measured tool rotation orientation during normal drilling allows the antenna to generate a magnetic dipole moment that may be directed at any three dimensional angle and from a common origin point at the centroid of the antenna. The antenna can also be embodied to be more sensitive to resitivity in a particular azimuthal direction.
摘要:
An electromagnetic antenna for Measurement-While-Drilling (MWD) applications is disclosed. The antenna can include several array elements that can act alone or together in various measurement modes. The antenna elements can be disposed in tool body recesses to be protected from damage. The antenna elements can include a ferrite plate crossed or looped by independent current carrying conductors in two or more directions forming a bi-directional or crossed magnetic dipole. Although disclosed as a MWD system conveyed by a drill string, basic concepts of the system are applicable to other types of borehole conveyance.