E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/24
E21B 43/26 (2006.01) C09K 8/70 (2006.01) E21B 43/267 (2006.01)
Patent
CA 1122896
A B S T R A C T The present invention relates to a method of forming fractures and placing proppants therein, which comprises creating a foam having a down-well Mitchell quality of from about 0.53 to 0.99 and passing that foam down the well in admixture with a particulate proppant in a concentration of up to three pounds of prop- pant per gallon of foam, then decreasing the gas ratio in said foam, whereby the proppant carrying medium being passed down the well changes from a foam to a liquid. The proppant concentration in the fluid is decreased as the change occurs from foam to liquid. so that the proppant material will not deposit out prematurely. Once liquid flow has been established, the proppant to fluid ratio is gradually increased and the fracture of the formation is contin- ued with liquid and proppant. The liquid is capable of carrying a concentration of proppant greater than that which could be carried by the foam.
369114
Canadian Fracmaster Ltd.
Gowling Lafleur Henderson Llp
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