Wells – Processes – Producing foam or gas in well by foaming or gas producing...
Patent
1982-03-05
1984-07-03
Novosad, Stephen J.
Wells
Processes
Producing foam or gas in well by foaming or gas producing...
175 69, E21B 718
Patent
active
044573758
ABSTRACT:
A foam generating apparatus (10) is provided for circulation of foam within a well (12) for drilling, operation or clean out. A liquid foam generating solution (38) is pressurized by a pump (48). The solution flows through a passage in a mixing tee (66). The mixing tee has a second passage which permits a pressurized gaseous aeration agent (35) to be entrained within the fluid flow. The turbulence of flow and downstream pressures permit onset of foam generation within the well. The foam consistency can be controlled by varying the pressure of the aeration agent and foam generating solution to maximize the effectiveness of the circulation. The ratio of aeration agent and fluid generating solution can also be varied. Variation of the pressure and aeration agent/foam generating solution ratio permits a range of foam to be created from wet flow for lifting fine particles and deep penetration in porous substances to a dry foam for lifting heavy particles with limited infiltration of foam within down hole materials.
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U.S. Department of the Interior document entitled "Water Expansion Evaluation", 1980.
An exerpt from the document "Fire Call" published in the U.S. Department of Interior, Bureau of Land Management, dated Nov., 1980.
"Charts Help Find Volume, Pressure Needed for Foam Drilling", Krug et al., The Oil and Gas Journal, Feb. 7, 1972.
Howison Gregory M.
Mills Jerry W.
Neuder William P.
Novosad Stephen J.
Selinger Jerry R.
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