E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
31/10
E21B 33/138 (2006.01) C09K 8/502 (2006.01) C09K 8/516 (2006.01)
Patent
CA 1154945
WELL TREATING FLUID (C-845) ABSTRACT OF THE DISCLOSURE The instant invention is directed to shear thick- ening fluids which comprise a water-swellable material (clay), present in a sufficient concentration so as to be capable of forming a stiff paste upon interaction with the water used, and water wherein the clay and water are kept separated by an intervening hydrocarbon-surfactant compo- sition. The intervening oil phase prevents the interaction between the water and the clay phases and results in a stable, nonreacting, pumpable composite until such time as the oil envelope is ruptured by application of a sufficiently high shear force. Upon such rupture, the materials inter- act rapidly forming a semi-rigid stiff paste. Various well-control problems, such as oil and gas with blowouts, can be controlled by use of the above-described composite. The composite is pumped down the well pipe. Exiting the orifices of the drill bit or a nozzle supplies the shear force needed to rupture the oil envelope thereby permitting the interaction between the clay and the water resulting in the formation of a stiff paste which can stop or prevent unwanted flow in or near the wellbore.
360286
Dawson Charles R. Jr.
Li Norman N.
O'brien Dennis E.
Borden Ladner Gervais Llp
Exxon Production Research Company
Exxon Research And Engineering Company
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