C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
31/10
C09K 8/502 (2006.01) C09K 8/26 (2006.01)
Patent
CA 1137739
SHEAR THICKENING WELL CONTROL FLUID (C-666) ABSTRACT OF THE DISCLOSURE The instant invention is directed to shear thicken- ing fluids which comprise a water swellable material (e.g., clay), capable of rapidly forming a paste having a strength of at least 2000 lbs/100 ft2 with the aqueous solution employed and present in sufficient concentration to form such a paste a nonaqueous hydrophobic material comprising a hydrocarbon material and a surfactant and/or strengthening agent, and an aqueous solution comprising water and a water swellable/ water solution polymer, wherein the clay and water-polymer solution are kept separated by an intervening hydrocarbon- surfactant phase. Preferably, the hydrocarbon-surfactant phase (oil phase) encapsulated clay is suspended in a con- tinuous phase comprising the water-polymer phase; however, suspension of clay and separate, discrete water-polymer droplet in a continuous oil phase are also possible as are compositions commonly called "double emulsions" as well as systems which are bicontinuous. The intervening oil phase prevents the interaction between the water-polymer and the clay phases and results in a stable, non-reacting, pumpable composite, until such time as the oil barrier is ruptured by deliberate application of a sufficiently high shear force. Upon such rupture, the materials mix and interact resulting in a semi-rigid high strength paste. Various well control problems such as oil and gas well blowouts can be controlled by use of the above-described composite. The composite is pumped down the well pipe. Upon application of a sufficiently high shear as by exiting the orifices of the drill bit, needed to rupture the oil envelope. the clay and the water-polymer interact, resulting in the formation of the semi-rigid, high strength paste which cures the well control problem, sealing the well circulation thief zone or terminating or preventing a blowout.
360460
Irani Cyrus A.
Mintz Donald J.
Borden Ladner Gervais Llp
Exxon Research And Engineering Company
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