Schlumberger Technology Corporation

Ahmad Latifzai

Edward C Boratko

Oliver Clinton Mullins

Robert J Schroeder

Christopher Harrison

Matthew T Sullivan

Douglas E Miller

Elizabeth Jennings Smythe

Douglas W Grant

George Alan Waters

Romain Charles Andre Prioul

Shunsuke Fukagawa

Andreas Hausot

Bruce A MacKay

Andrew John Duguid

Canyun Wang

Alireza Farahani

Methods and related systems are described for measuring acoustic signals in a borehole during a fracturing operation. The system includes a downhole toolstring designed and adapted for deployment in a borehole formed within a subterranean rock formation. A downhole rock fracturing tool opens and propagates a fracture in the subterranean rock formation. Dipole and/or quadrupole acoustic sources transmit acoustic energy into the subterranean rock formation. A receiver array measures acoustic energy traveling through the subterranean rock formation before, during and after the fracture induction. Geophones mounted on extendable arms can be used to measure shear wave acoustic energy travelling in the rock formation. The toolstring can be constructed such that the sources and receivers straddle the fracture zone during the fracturing. Alternatively, the sources or the receivers can co-located axially with the fracture zone, or the toolstring can be repositioned following fracturing such that the fracture zone is between the acoustic sources and receivers.

Microhydraulic fracturing with downhole acoustic measurement

A method for calculating transmissibility, pore pressure, permeability and/or other properties of a subsurface layer comprising the modeling of the borehole pressure recorded from the time the subsurface layer is fractured by isolating said subsurface layer with a downhole tool, pumping fluid into the subsurface layer and stopping pumping said fluid once the formation is fractured until a pseudo-radial or pseudo-linear flow is reached. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims.

Measuring properties of low permeability formations

Systems and methods of determining fluid properties are disclosed. An example apparatus to determine a saturation pressure of a fluid includes a housing having a detection chamber and a heater assembly partially positioned within the detection chamber to heat a fluid. The example apparatus also includes a sensor assembly to detect a property of the fluid and a processor to identify a saturation pressure of the fluid using the property of the fluid.

Systems and methods of determining fluid properties

Methods and related systems are described for making measurements at multiple locations in an annular region of a cased sequestration well. A first tool module is positionable within the well and adapted to directly or indirectly measure changing pressure at a first location in the annular region of the well. A pressure change is induced at the first location in the annular region. A second tool module is positionable within the well and adapted to directly or indirectly measure changing pressure at a second location in the annular region. The measured pressure changes at the second location are in response to the induced pressure change at the first location.

Annular region evaluation in sequestration wells

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Katy, TX, United States of America

Ahmad Latifzai