Schlumberger Technology Corporation

Schlumberger Canada Limited

Services Petroliers Schlumberger

Sebastien Catheline

Michel Michaux

Mickael Allouche

Alice Chougnet-Sirapian

Nicolas Droger

Francis Allouche

Gas monitoring systems () and methods for determining a burning hydrocarbon effluent gas plume property. A laser emission system emits laser beams () along a path through the plume (). A detection system facilitates determining intensity data indicative of intensities of the laser beams () backscattered by a surface () after passing through the plume (). The laser emission system emits a first laser beam () along the path while tuning its wavelength around a wavelength corresponding to a COspectral absorption line. The laser emission system emits a second laser beam () along the path while tuning its wavelength around a wavelength corresponding to a spectral absorption line of a second predetermined gas. The processing system determines a first concentration path length of the CObased on the first intensity data, a second concentration path length of the second predetermined gas based on the second intensity data, and the plume property based on the determined concentration path lengths. The plume property may be the rate of emission of the second predetermined gas or the combustion efficiency.

Determining a property of a gas plume produced by burning hydrocarbon effluent

Methods for cementing a subterranean well and maintaining zonal isolation involve preparing a cement slurry that contains water, an inorganic cement and an expanding agent. The slurry is placed in the annular region between casing and the formation or between two casing strings. After the cement sets, the expanding agent reacts and causes the set cement to be in a state of compression within the annular region. The casing dimensions may fluctuate in response to a temperature change, a pressure change, a mechanical disturbance resulting from a well intervention, or mud contamination or a combination thereof. The expanding agent may further react and maintain a state of compression within the annular region. The state of compression in the annular region may be monitored by acoustic impedance measurements.

Compositions and methods for well cementing

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Clamart, France

Sebastien Catheline