Patent ID: 6394182
Filing Date: 2002-05-28
Classification: B01D,E21B

Abstract:
Static spiral separator for separating phases of a multiphase fluid at a bottom of an oil production well, comprising:a production pipe for carrying a substantially liquid phase separated from said multiphase fluid to an upper end thereof, at least one first flat laminar section rigidly connected vertically by an inner lateral edge thereof to an outer surface of said production pipe, at least one second flat laminar section at a distance from the first flat laminar section and also rigidly connected vertically by an inner lateral edge thereof to the outer surface of the production pipe, at least one descending first helicoidal laminar section rigidly connected by an upper end thereof to a bottom of the first flat laminar section and by an inner lateral edge thereof to the outer surface of said production pipe, and serving to transport the phases of said multiphase fluid and to separate them along a length thereof, at least one descending second helicoidal laminar section, rigidly attached by an upper end thereof to a bottom of said second flat laminar section and by an inner lateral edge thereof to the outer surface of said production pipe, said second helicoidal laminar section being located between pitches of a screw formed by said first helicoidal laminar section, having a length shorter than the length of said first helicoidal laminar section, and serving to carry a gaseous phase separated from the multiphase fluid, a shell having a first cylindrical wall part at a lower part thereof which encloses said first helicoidal laminar section and said second helicoidal laminar section, is rigidly attached to outer lateral edges of the first and second helicoidal laminar sections by means of an inner surface thereof, is open at a top thereof and closed by a circular wall at a bottom thereof, the shell having at an upper part thereof, a second cylindrical wall part attached to the top of the first cylindrical wall part, the second cylindrical wall part having a circumferential cross section having a same radius as the first cylindrical wall part and rigidly attached to the outer lateral edge of the first flat laminar section and the outer lateral edge of the second flat laminar section, an inlet region for said multiphase fluid, formed by the opening the first cylindrical wall part of the shell, which serves to admit the multiphase fluid which is to be separated, and a fluid phase region located at a base of said first cylindrical wall part of said shell formed by a junction between the first cylindrical wall part and the circular wall and serving to concentrate a substantially more liquid fluid phase captured by the production pipe.