Statoil Asa

Other

Norskhydro Asa

Halliburton As

Halliburton Energy Services, Inc.

Den Norske Stats Oljeselskap A.s.

Electromagnetic Geoservices As

Sensor Development As

Norgas Geotekniske Institut

Norges Geotekniske Insitutt

Fan-nian Kong

Harald Westerdahl

Svein Ellingsrud

Terje Eidesmo

Øivind Godager

Bruce H Storm, Jr

Svein Erling Johnstad

Stale Johansen

Oivind Godager

Vidar Sten-Halvorsen

Einar St&oslash;len

Wireless downhole sensor technology is being deployed in oil and gas wells. System components are inductively coupled, which enables remote placement of apparatus on the outside of wellbore conduit without the need for any wired connection. These systems make use of a pair of conductive elements that need to be aligned in the well. Embodiments of the present invention provide techniques to correctly space out the wellbore completion string so that the downhole conductive elements will be properly aligned and within proximity to establish wireless connectivity, as the wellbore completion string is set and the tubing hanger is landed inside the wellhead housing of the well.

Method and system for alignment of a wellbore completion

Wireless downhole sensor technology is being deployed in oil and gas wells. System components are inductively coupled, which enables remote placement of apparatus on the outside of wellbore conduit without the need for any wired connection. These systems make use of a pair of conductive elements that need to be aligned in the well. Embodiments of the present invention provide techniques to correctly space out the wellbore completion string so that the down-hole conductive elements will be properly aligned and within proximity to establish wireless connectivity, as the wellbore completion string is set and the tubing hanger is landed inside the wellhead housing of the well.

A wellbore E-field wireless communication system, the communication system comprising a first E-field antenna, and a second E-field antenna, wherein the first antenna, and the second antenna are both arranged in a common compartment, such as an annulus of a wellbore and further arranged for transferring a signal between a first connector of the first E-field antenna and a second connector of the second E-field antenna by radio waves.

Wellbore E-field wireless communication system

A method for monitoring a high-resistivity reservoir rock formation () below one or more less resistive formations (). The method includes transmitting an electromagnetic signal (S) propagating from near a seafloor or land surface () by means of an electromagnetic transmitter () powered by a voltage signal generator (G). The electromagnetic signal (S) propagates from the seafloor () and is guided along a conductive string () to the high-resistive formation (), and propagates as a guided-wave electromagnetic signal (S) at a relatively higher speed (V) inside the high-resistivity formation () than a propagation speed (V) in the less resistive formations (). The guided-wave electromagnetic signal (S) gives rise to an upward refracting electromagnetic signal (R) having the relatively lower propagation speed (V) in the less resistive formations () and having an exit angle nearer to the normal (N) to the interface between the high-resistivity formation () and the lower-resistivity formation (), and gives rise to a steeply rising refraction wave front (F). The refracted electromagnetic wave front (F) includes refracted electromagnetic signals (R) detected along an array of sensor antennas (, . . . ,) positioned along the seafloor. The array having a direction away from the transmitter ().

Method for monitoring low-resistivity formation using polarized waves

A device for monitoring the position of an oil/water contact (OWC,) between an oil-continuous fluid () overlying a water-continuous fluid () inside a casing pipe (). The device includes a transmitter () for a generating an electromagnetic signal (ST) and the transmitter () is provided with electrical energy (G) from a voltage signal generator (G). The transmitter () is arranged inside the casing pipe () in the oil-continuous fluid () and above the oil-water contact (). The electromagnetic wave signal (S) partly propagates downwards from the transmitter (), is partly reflected from the oil-water contact (), and is partly reflected by the end of the casing, giving rise to an upward propagating, reflected electro-magnetic signal (S). The device also includes a sensor () for detecting the reflected electromagnetic signal (S), and the sensor () is also arranged above the oil-water contact (), providing a sensor signal (R) to a receiver () for receiving the sensor signal (R) and further to an analyzing device () for analyzing the sensor signal (R), e.g. with respect to two-way propagation time or amplitude in order to calculate an elevation level for the oil-water contact.

Device for monitoring of oil-water interface

The present invention relates to a system and apparatus for detecting and recovering hydrocarbons located in a subterranean reservoir In some embodiments, an electromagnetic field is applied by a transmitter positioned on a seabed and detected by antenna also positioned on the seabed.

Method and apparatus for recovering hydrocarbons from subterranean reservoirs

A method for mapping a submarine or subterranean reservoir by conducting an electromagnetic survey using an electromagnetic field in the form of a wave. An electromagnetic field is applied by a transmitter on the seabed and detected by antennae. The nature of the detected reflected waves is used to determine whether the reservoir contains water or hydrocarbons, which may then be produced from a well that penetrates the reservoir.

Electromagnetic surveying for mapping the content of subterranean reservoirs

A system for investigating subterranean strata. An electromagnetic field is applied using a dipole antenna transmitter and this is detected using a dipole antenna receiver. Phase information is extracted from a refracted wave response and used to identify the presence and/or nature of a subterranean reservoir.

Electromagnetic method and apparatus for determining the nature of subterranean reservoirs using refracted electromagnetic waves

A system for investigating subterranean strata. An electromagnetic field is applied using a fixed dipole antenna transmitter and this is detected using a dipole antenna receiver. The receiver is moved from one location to another in dependence upon the strength of the detected signal.

Electromagnetic methods and apparatus for determining the content of subterranean reservoirs

Methods and devices are disclosed for determining if hydrocarbons or water is present in a subterranean reservoir are described. Certain embodiments involve an electromagnetic field applied by a transmitter on the seabed and detected by at least one antenna also on the seabed, wherein a refracted wave component is sought in the wave field response, and is analyzed to determine the nature and contents of the resevoir.

Method and apparatus for determining the nature of subterranean reservoirs using refracted electromagnetic waves

A method for investigating subterranean strata. An electromagnetic field is applied using a dipole antenna transmitter and this is detected using a dipole antenna receiver. Phase information is extracted from a refracted wave response and used to identify the presence and/or nature of a subterranean reservoir.

The invention is a well radar for detecting, by electromagnetic wave reflection, resistivity horizons in production zones in oil wells. Transmitter and receiver antennas are combined in a tubing string antenna module. Two dipole transmitter antenna are positioned in a first position on either side of the tubing string antenna module. A first directionally sensitive group of four dipole receiver antennas is positioned in a second positioned so that the receiver antennas have even angular separation. Likewise, a second directionally sensitive group of four dipole receiver antennas is positioned in a third position opposite the first directionally sensitive group.

Device for electromagnetic detection of geological properties in a well

A system for determining the nature of a subterranean reservoir whose position and geometry is known from previous seismic surveys. An electromagnetic field is applied by a transmitter on the seabed and detected by antennea also on the seabed . The nature of the detected reflected waves is used to determine whether the reservoir contains water or hydrocarbons.

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Fan-nian Kong