Schlumberger Technology Corporation

Gale Hyslip Gustavson

Oliver Clinton Mullins

Bhavani Raghuraman

Li Jiang

Timothy Gareth John Jones

Philip Rabbito

Rogerio Tadeu Ramos

Christopher Harrison

Kosta Ladavac

Ronald E G Van Hal

Jimmy Lawrence

Edward Harrigan

Ricardo Vasques

Albert Ballard Andrews

Oleg Zhdaneev

Philippe Salamitou

Ronald Van Hal

Torleif Torgersen

Emilie Dressaire

Andrew L Kurkjian

David Linton Johnson

Ralph Michael D'Angelo

Anthony Robert Holmes Goodwin

Ahmed Hammami

Soraya Sofia Betancourt

Lennox Reid

John Allan Nighswander

Kenneth William Winkler

A Ballard Andrews

Moin Muhammad

Jinglin Gao

Craig Borman

Syriac George Mathews

Tara Davies

Methods and related apparatuses and mixtures are described for detecting hydrogen sulfide in a formation fluid downhole. A detection mixture is combined with the formation fluid downhole. The detection mixture includes metal ions for reacting with hydrogen sulfide forming a metal sulfide, and charged nanoparticles sized so as to inhibit significant aggregation of the metal sulfide so as to enable spectroscopic detection of the metal sulfide downhole. The combined mixture and formation fluid is then spectroscopically interrogated so as to detect the presence of the metal sulfide thereby indicating the presence of hydrogen sulfide in the formation fluid. The mixture also includes chelating ligands for sustaining thermal endurance of the mixture under downhole conditions.

Downhole spectroscopic hydrogen sulfide detection

A method for analyzing formation fluid in earth formation surrounding a borehole includes storing analytical reagent in a reagent container in a fluids analyzer in a formation tester and moving the formation tester, including the reagent, downhole. Reagent from the reagent container is injected into formation fluid in the flow-line to make a mixture of formation fluid and reagent. The mixture is moved through a spectral analyzer cell in the fluids analyzer to produce a time-series of optical density measurements at a plurality of wavelengths. A characteristic of formation fluid is determined by spectral analysis of the time-series of optical density measurements.

Fluid analyzer for determining fluid chemistry of formation fluid by downhole reagent injection spectral analysis

An indicator mixture that allows pH measurement over a broader range of pH or to a higher accuracy than available using conventional spectroscopic techniques. In particular, the mixture of the present invention is comprised of two or more reagents such that when combined, the reagent mixture is capable of either detecting: (1) a pH range broader or more accurate than that the reagents individually, or (2) pH more accurately than the reagents individually. Also disclosed are methods of making and using the mixture.

Spectroscopic pH measurement using optimized mixtures of reagents to extend measurement range

Spetroscopic pH measurement using optimized mixtures of reagents to extend measurement range

Determining fluid chemistry of formation fluid by downhole reagent injection spectral analysis

Methods and apparatuses for high-temperature and high-pressure measurement of pH and/or alkalinity of a fluid is described.

Spectroscopic pH measurement at high-temperature and/or high-pressure

Methods of assuring that a representative formation and/or fluid sample of a subterranean reservoir is obtained are provided. One method of validating a reservoir fluid sample obtained from a wellbore includes the steps of acquiring a reservoir fluid sample in the wellbore; measuring a property of the fluid sample downhole with a technique to obtain a measured downhole fluid property; replicating the measuring technique used to obtain the measured downhole fluid property to obtain at a remote location from the wellbore with a technique to obtain at least one measured remote location fluid property; validating the fluid sample through comparison of the measured downhole fluid property and the at least one measured remote location fluid property.

Reservoir sample chain-of-custody

The invention concerns an apparatus for analysing water chemistry. According to the invention, the apparatus is adapted to operate downhole and comprises a colouring agent supply device for supplying a colouring agent to a water sample, the colour of the water sample thus supplied being indicative of the water sample chemistry, and a colorimetric analyser arranged to determine the colour of the water sample.

Apparatus and method for analysing downhole water chemistry

Tube waves are used to locate and characterize a solids deposit inside a fluid-filled pipe. An acoustic tube wave pulse is transmitted along the pipe. On encountering a solids deposit, the tube wave pulse is perturbed and partially reflected by changes in the boundary conditions between the fluid and the pipe to produce two deposit-modified acoustic waves. One is a perturbed wave travelling in the same direction as the tube wave pulse. The other is a reflected wave travelling in the opposite direction. One of these deposit-modified acoustic waves is received to produce an acoustic signal. Accumulated acoustic signals are processed by Fast-Fourier Transform to produce frequency-based digital data. Phase data from the frequency-based digital data is inverted to produce slowness spectrum data. Power data from the frequency-based digital data is inverted to produce attenuation spectrum data. Spectrum data is used to locate a solids deposit in the pipe. Inversion model processing of the spectrum data is used to estimate solids deposit thickness and type.

Assessing a solids deposit in an oilfield pipe

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Brookfield, CT, United States of America

Gale Hyslip Gustavson