Sand-controlled pumping device of submarine caisson gas-liquid separator

Abstract

The invention discloses a sand-controlled pumping device of a submarine caisson gas-liquid separator. The sand-controlled pumping device comprises an external swirl chamber, an internal swirl chamber, a sand storage chamber and an electric submersible pump, wherein the inner part of the external swirl chamber is sleeved with the internal swirl chamber; the sand storage chamber sleeves the bottom of the external swirl chamber; the electric submersible pump is arranged at the upper part of the internal swirl chamber and is connected with an electric motor; a spiral inlet pipe of the external swirl chamber is arranged at the upper part of the external swirl chamber in a fit manner; a plurality of rows of sand removal holes are formed in the periphery of the lower part of the external swirl chamber; a plurality of stopping rib plates are evenly arranged on the inner wall of the sand storage chamber; a suction inlet of the electric submersible pump is formed in the upper part of the internal swirl chamber; the suction inlet of the electric submersible pump is connected with the electric submersible pump; an internal swirl chamber spiral inclining pipe is arranged in the bottom of the internal swirl chamber; and the electric motor is inserted into the space of the internal swirl chamber. According to the sand-controlled pumping device, the damage to the electric submersible pump caused by large-grained sand is prevented; deposition of fine sand at the bottom of the caisson is prevented; the problem of blockage of the separator is solved; and the required sand storage space is reduced.

Description

technical field [0001] The invention relates to a seabed caisson, in particular to a sand control pumping device for a gas-liquid separator of the seabed caisson. It belongs to the field of offshore oil engineering. Background technique [0002] With the development of the offshore oil industry, the oil and gas separation process has gradually developed from offshore platforms and shallow sea separation to deep sea below 1500m. Because the gravity horizontal separator is too bulky, it is difficult to install, and the large-diameter cylinder of the separator is not conducive to overcoming the deep sea water pressure; and because the centrifugal force cyclone separator has a relatively narrow processing space, it is difficult for It is too sensitive to changes in the gas-liquid ratio, and therefore, its reliability is insufficient. [0003] In order to overcome the above shortcomings, the caisson gas-liquid separator developed on the basis of the columnar gas-liquid cyclone ...

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Problems solved by technology

[0010] The main purpose of the present invention is to overcome the above-mentioned shortcomings existing in the prior art, and to provide an improved sand control pumping device for the gas-liquid separator of the seabed caisson, which adopts a combination of sand removal and sand carrying, and does not use any The filter component not only prevents the damage of large-grained sand to the electric submersible pump, but also prevents the deposition of fine sand at the bottom of the caisson, which solves the problem of clogging the separator; at the same time, it greatly reduces the required sand storage space

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