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177 results about "Wireline" patented technology

In the oil and gas industry, the term wireline usually refers to a cabling technology used by operators of oil and gas wells to lower equipment or measurement devices into the well for the purposes of well intervention, reservoir evaluation, and pipe recovery.

High-resolution high-speed NMR well logging device

Wireline NMR well logging measurements suffer from disadvantages of poor vertical resolution, logging speeds less than 20 ft / min, and power consumption in excess of 200 W. In spite of these disadvantages, NMR well logging is used because it is capable of providing estimates for a number of petrophysical parameters that are difficult to obtain from other wireline data. These include estimates of the bulk volume irreducible (BVI) of fluids in the formation. The present invention targets BVI and clay bound water (CBW) measurements. Logging speeds of up to 60 ft / min are attainable with little or no loss of resolution. In one preferred embodiment, the tool has four sensors circumferentially distributed around the logging tool and in contact with the borehole wall. A horseshoe like magnet is used to generate the static magnetic field. The magnet poles are designed such that the magnetic field is uniform perpendicular tool motion, as well as provide a sufficiently large extent of the static field to provide polarization for bound water in rock formations. The RF portion of the sensor is comprised of at least one coil configured for transmission of an RF magnetic field into rock formations and at least two coils configured to separately receive the NMR signal from the formation. In another embodiment a coil is wound around the pole pieces or the iron yoke for the purpose of field shifting to enable acquisition of phase-alternated measurements.
Owner:BAKER HUGHES INC

Fluid conductivity sensor, and device and method for measuring fluid conductivity

The invention discloses a fluid conductivity sensor, and a device and a method for measuring fluid conductivity, and relates to the field of wireline logging. The method comprises the following steps: detecting voltage values of the two ends of a receiving resistor at different temperatures when no fluid passes to obtain multiple groups of first voltage values; inverting a relationship between induced voltages generated at the two ends of the receiving resistor by a transmitting coil and temperature variation according to the relationship between the multiple groups of first voltage values and temperature variation; detecting the voltage values of the two ends of the receiving resistor at different temperatures when fluid to be monitored passes to obtain multiple groups of second voltage values; calculating to obtain a relationship between the fluid conductivity and temperature variation according to the relationship between the induced voltages generated at the two ends of the receiving resistor by the transmitting coil and temperature variation and the multiple groups of second voltage values. Due to the design that a winding is connected in parallel with the fluid conductivity sensor and a matched circuit is provided, temperature compensation of the sensor is realized, and measuring accuracy of the coil type fluid conductivity sensor under a high-temperature environment is guaranteed.
Owner:CHINA NAT OFFSHORE OIL CORP +1
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