Schlumberger Technology Corporation

Taner Batmaz

Yiyan Chen

Eric L Hanson

Jesse Lee

Christopher N Fredd

Timothy L Pope

Kousic Theja Kanneganti

Stevanus Dwi Kurniadi

Douglas Bentley

Omar Al Zeidi

Mehmet Nihat Gurmen

Samuel Cozzens

Safdar Mohammad Khan

A method includes identifying one or more stress regime types along at least a portion of a borehole, where the stress regime types are selected from a normal stress regime, a thrust stress regime and a strike-slip stress regime, and selecting reservoir access locations along the borehole based on the type of stress regime identified along the borehole.

Workflows to address localized stress regime heterogeneity to enable hydraulic fracturing

A method for shortening the shear recovery time of zwitterionic viscoelastic surfactant fluids by adding a rheology enhancer having the structure:R-(EO)(PO)&#x2014;R'&#x2014;OHin which R is an alkyl group that is straight chained or branched, saturated or unsaturated, and contains from 3 to about 18 carbon atoms, x is from 0 to about 14, y is from 0 to about 7, R&#x2032; is an alkyl group that contains from 0 to about 14 carbon atoms and is straight chained, branched if having more than 3 carbon atoms, saturated, unsaturated if having more than one carbon atom, the total number of carbon atoms in R plus R&#x2032; is from 3 to about 21, and the EO and PO groups, if present, may be in any order. The rheology enhancer also increases fluid viscosity and thermal stability. Preferred surfactants are betaines. The fluids are useful in oilfield treatments, for example fracturing and gravel packing.

Viscoelastic surfactant rheology modification

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Muscat, Oman

Taner Batmaz