The FMI fullbore formation microimager gives you microresistivity formation images and dip data in water-base mud, differentiating the structures and. UltraTRAC all-terrain wireline tractor conveys FMI microimager ft in carbonate reservoir lateral in only 7 h, New Mexico. The FMI-HD high-definition formation micro-imager employs the well-proven microresistivity imaging approach of the industry-standard FMI fullbore formation .
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FMI Fullbore Formation Microimager
The third factor is the scattering or absorption of acoustic energy by particles in the drilling mud. The second factor is the contrast in acoustic impedance between the drilling mud and the material that makes up the borehole wall.
Use this section to provide links to relevant material on websites other than PetroWiki and OnePetro. Originally, in the mids, they comprised two high-resolution schlumberher with 27 button electrodes distributed azimuthally on each.
The principal application of downhole video has been in air-filled holes in which acoustic and contact electrical images cannot be obtained. An applied voltage causes an alternating current to flow from each electrode into the formation and then to be received at a return electrode on the upper part of the tool. The UBI measures reflection amplitude and radial distance using a direct measurement of mud velocity.
Downhole cameras were the first borehole-imaging devices. The aim was to investigate the orientation and magnitudes of in-situ stresses using borehole-image data. The travel time for the acoustic pulse depends on the distance between the transducer and the borehole wall, as well as the mud velocity.
FMI Fullbore Formation Microimager | Schlumberger
They are especially useful for net-sand definition in thinly laminated fluvial and turbidite depositional environments. The applications range from detailed reservoir description through reservoir performance to enhanced hydrocarbon recovery.
The size of the subassembly is selected on the basis of the diameter of the hole that is to be logged. Acoustic borehole-imaging devices are known as “borehole televiewers. Use this section to list papers in OnePetro that a reader who wants to learn more should definitely read. However, in this downhole case, the aperture of the sensor gives an intrinsic spatial resolution of 0. Current is focused into the formation, where a depth of investigation of several tens of centimeters is claimed.
Examples of microresistivity image displays are shown in Figs. Electrical microimaging tools have proved superior to the ultrasonic televiewers in schlubmerger identification of sedimentary characteristics and some structural features such as natural fractures in sedimentary rocks.
Rather than have to change out the mud specifically for a microresistivity imaging survey, two other approaches have been pursued. The borehole televiewer operates with pulsed acoustic energy so that it can image the borehole wall in the presence of opaque drilling muds. There are two positional modes:.
The first has been to develop a new synthetic mud that retains all the stabilizing characteristics of conventional synthetic muds but is sufficiently conductive to permit microresistivity imaging measurements. Data are presented as orientated, juxtaposed pad outputs whereby the cylindrical surface of the borehole wall is flattened out. The resolution of electrical microimaging tools is governed by the size of the buttons, usually a fraction of an inch.
In contrast, note the undiagnostic smoothed form of the conventional array induction logs around depth XX30 ft in Track 2. The combined tool is 86 ft [ Unless transparent fluid can be injected ahead of the lens, the method fails.
Brochure: FMI Fullbore Formation MicroImager Brochure | Schlumberger
Microresistivity imaging devices were developed as an advancement on dipmeter technology, which they have mostly superseded. The principal drawback is that they require a transparent fluid in liquid-filled holes.
Reflected pulses are received by the transducer. Prensky  has provided an excellent review of this important subject.
The measurement principle of the microresistivity imaging devices is straightforward. Short bursts shclumberger acoustic energy are emitted by a rotating transducer in pulse-echo mode. These are conventional four-arm dipmeters for which the four microelectrodes are replaced by microinduction sensors.