The invention relates to the technical field of
petrochemical engineering, in particular to a controlled releasing microcapsule for scale prevention,
wax prevention or
viscosity reduction of an
oil well. The invention discloses a
solid controlled releasing microcapsule for scale and
corrosion prevention in the production process of
crude oil and
wax prevention or
viscosity reduction in the production process of the
crude oil as well as a preparation method thereof. Filler comprising an inorganic framework and agent components is arranged in a
macromolecule composite membrane. The controlled releasing microcapsule has a stable structure comprising an inside inorganic framework support and an outer-layer macromolecular
composite membrane wrapping film, can be used for realizing the slow release of the agent and achieving the aim of maintaining the agent effective for a long term as well as the functions of
corrosion inhibition and dispersion. With proper volume and density, the controlled releasing microcapsule can be prevented from being taken away by an extraction solution and can be added through a sleeve; and the controlled releasing microcapsule is simple in process and is strong in maneuverability. According to the controlled releasing microcapsule, volatile matters and harmful components which do harm to the
human health are avoided; various components can be basically and slowly dissolved; the labor intensity of workers is reduced; and one-time agent addition can ensure stable operation for 30-90 days.