ASSEMBLY FOR EXTRACTING BURS FROM SEA BOTTOM Russian patent published in 2009 - IPC E21C50/00 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to hydro-mechanized assemblies for extracting burs from sea bottom. Assembly for extracting burs consists of a base vessel, of a sludge pump with suction and outlet branches, and of a pressurising pipeline connected with the outlet branch by means of a flange; also dimensions of openings of the perforated branch are accepted as equal to a minimal dimension of extracted burs. The pressurising pipeline is directed vertically. By means of a socket sleeve the above-water part of the pipeline is pivotally secured to the end of a derricking jib of a revolving crane assembled on the base vessel so, that the pressurising pipeline can be lowered, lifted and displaced in a horizontal plane. The upper part of the pipeline is connected with a bur receiving capacity by means of a flexible hose. An overhung rotary frame is arranged on the lower part of the pipeline and is designed to rotate relative to the pipeline in a horizontal plane. The frame is kinematically connected to a drive of rotation. Two chutes of a cylinder in cross-section shape and parallel to each other are arranged on the lower parts of the frame symmetrically directed relative to the pipeline. Horizontally pointed screws equipped with drives of their rotation are installed on bearings in the chutes. The screws are designed to grab burs from the bottom of a water area and to transfer them to the suction branch of the pressurising pipeline. Each chute with a gap envelopes screw from atop on arc of 180 degrees from one side and on arc of 90 degrees from another. The bigger arc is placed from the side opposite to the direction of frame rotation. In plane lengthwise axes of screws are located on both sides from the axis of the pipeline at an equal distance from this axis on opposite parts of the frame relative to the pipeline. The chutes of the screws are connected with the suction branch, which is made in form of a truncated cone expanding downward. The bur receiving capacity is made in form an inclined grid, where from free from water burs are reloaded to movable containers. A sump is installed under the grid.

EFFECT: simplification and reduction in cost of assembly design, increased efficiency and facilitation of partial load mode of burs extraction.

3 cl, 3 dwg