Method for controlling bottom water coning by foam
A foam control, oil well technology, applied in earth-moving drilling, wellbore/well components, production fluids, etc., can solve problems such as inability to seal with bottom water, inability to achieve the effect of oil wells, and inability to run large tools such as packers , to achieve the effect of reducing seepage resistance and reducing surface tension
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[0020] The method adopted in the invention is to inject a large amount of foam at the oil-water interface of the oil well to form a stable foam sealing zone.
[0021] Foam is a dispersed system formed by gas and foam base liquid. The liquid is the continuous phase, and the gas is the dispersed phase. The foam base liquid is mainly a solution prepared in a certain proportion from liquid, foaming agent and foam stabilizer. The gas is usually air, Nitrogen, CO 2 , natural gas and flue gas.
[0022] During construction, gas and foam base liquid are injected into the construction manifold at the same time, and the gas and foam base liquid are mixed in the manifold to form foam. The volume ratio of gas to liquid is usually 2:1 (underground) or 1:1 (underground). Injection at a certain ratio; the foam base liquid is an aqueous solution with a foaming agent, and the foaming agent can be anionic, cationic or nonionic surfactants, and the concentration is controlled within the range of...
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