Schlumberger Technology Corporation

Other

Tudor Ioan Palaghita

Julian J Pop

Kentaro Indo

Tullio Moscato

Sepand Ossia

Maxim Nikolayevich Yushko

Zeynep Alpman

Alexis Petit

Frank F Espinosa

Ashers Partouche

Srinand Sreedharan Karuppoor

Bryan K Rogers

Adriaan Gisolf

Stephen Parks

Hadrien Dumont

Fernando Garcia-Osuna

Christopher Albert Babin

Arun Sharma

Cory James

Stephen Torgerson

Francois Robert

Peter Miller

Sebastian Mastrangelo

Gabriel Morosini

A fluid sampling probe may include one or more features that increase the likelihood that a seal will be maintained during a sampling operation, even for sampling operations in unconsolidated formations. This may reduce contamination in formation fluid samples that are obtained during sampling operations. The fluid sampling probe may include a reinforcement ring configured to extend into a geological formation beyond an elastomer portion of the fluid sampling probe, which may support the geological formation and prevent a failure of the formation during sampling operations. The fluid sampling probe may also include a stop sleeve to prevent overextension that could otherwise cause the geological formation to collapse. In addition, the fluid sampling probe may include a relatively wider sealing elastomer that may decrease in height monotonically radially from the center of the fluid sampling probe.

Focus probe for unconsolidated formations

A method for sampling a downhole formation fluid includes pumping formation fluid into the flowline of a downhole sampling tool While pumping, a saturation pressure of the formation fluid is measured. The pumping rate is adjusted such that the fluid pressure in the flowline remains above a threshold saturation pressure.

Flowline saturation pressure measurements

A method for sampling a downhole formation fluid includes pumping formation fluid into the flowline of a downhole sampling tool, measuring a saturation pressure of the formation fluid in the flowline while pumping, and adjusting the pumping rate such that the fluid pressure in the flowline remains within a predetermined threshold above the measured saturation pressure.

Flowline saturation pressure measurement

A pressure testing module separable from and configured to be coupled with a tool base that is to be coupled along a downhole tool string to be conveyed within a wellbore extending into a subterranean formation. The pressure testing module includes a chamber and a piston assembly slidably disposed within the chamber, thus dividing the chamber into a first chamber portion and a second chamber portion. The piston assembly is operable to move in response to hydraulic fluid being pumped into the first chamber portion and to draw formation fluid of the wellbore into the second chamber portion in response to the movement of the piston assembly.

Formation pressure testing

A method for sampling a downhole formation fluid includes pumping formation fluid into the flowline of a downhole sampling tool. The method can also include measuring a saturation pressure of the formation fluid in the flowline while pumping. The method can also include adjusting the pumping rate such that the fluid pressure in the flowline remains within a predetermined threshold above the measured saturation pressure.

A method for sampling a downhole formation fluid that includes pumping formation fluid into the flowline of a downhole sampling tool. The method also includes measuring a saturation pressure of the formation fluid in the flowline while pumping, and adjusting the pumping rate such that the fluid pressure in the flowline remains within a predetermined threshold above the measured saturation pressure.

A method including positioning a downhole acquisition tool in a wellbore in a geological formation; performing a pretest sequence to gather at least one of pressure or mobility information based on downhole acquisition from a sample line, a guard line, or both while the downhole acquisition tool is within the wellbore. The pretest sequence includes controlling a valve assembly to a first valve configuration that may allow the fluid to flow into the downhole tool via one or more flowlines toward a pretest system. The one or more flowlines include the sample line only, the guard line only, or both the sample line and the guard line; and drawing in the fluid through the one or more flowlines. The method also includes controlling the valve assembly to a second valve configuration. The second valve configuration is different from the first valve configuration and may block the one or more flowlines from drawing in the fluid.

System and methods for pretests for downhole fluids

A well-logging tool for geological formation has a borehole. A housing that is to be positioned within the borehole includes an opening. An electrically conductive winding is carried by the housing. A feedthrough assembly includes an elongate electrical conductor having opposing first and second ends and a medial portion extending therebetween. The first end is coupled to the electrically conductive winding. An integrally formed, monolithic, dielectric layer sounds the elongate electrical conductor and includes a first enlarged diameter end portion surrounding the first end of the elongate electrical conductor and is positioned within the opening. A reduced diameter portion surrounds the medial portion of the elongate electrical conductor.

Feedthrough assembly for electrically conductive winding

A well-logging tool for a geological formation has a housing to be positioned within a borehole and has first and second openings. A feedthrough assembly includes an elongate electrical conductor having opposing first and second ends and a medial portion extending therebetween. An integrally formed, monolithic, dielectric layer surrounds the elongate electrical conductor and includes a first enlarged diameter end portion surrounding the first end of the elongate electrical conductor and is positioned within the first opening. A second enlarged diameter end portion surrounds the second end of the elongate electrical conductor and is positioned within the second opening. A reduced diameter portion surrounds the medial portion of the elongate electrical conductor.

Feedthrough assembly for well-logging tool

A wellbore apparatus may include first and second tubular members joined together in end-to-end relation, the first tubular member having a reduced outer diameter end portion. The wellbore apparatus may further include a removable modular antenna assembly comprising a cylindrical dielectric housing removably positioned on the reduced outer diameter end portion of the first tubular member, at least one antenna coil carried by the cylindrical dielectric housing, and a first electrical connector coupled to the at least one antenna coil. The wellbore apparatus may also include resistivity processing circuitry coupled to the first electrical connector to determine an electrical resistivity of a wellbore based upon the at least one antenna coil.

Growing community of inventors

Houston, TX, United States of America

Tudor Ioan Palaghita