Oblique tube type row-column electrode array underwater online electric dehydration unit

Abstract

The invention provides an oblique tube type row-column electrode array underwater online electric dehydration unit applied to underwater direct electric dehydration of pre-separated crude oil. Vertical-horizontal online separation technique for crude oil and parallel high-voltage electric field dehydration technique for crude oil are combined organically herein; efficient oil-water separation and underwater quick dehydration are achieved according to oblique tube type structure and row-column electrode array; the pre-separated crude oil and an emulsifier are stirred by a flow stabilizer through flow stabilizing rods and a flow stabilizing blade wheel, the formed crude oil emulsion is adjusted into a uniform flow, and the crude oil emulsion is then re-organized into a stable flow through a liquid coming wheel shaft and a liquid incoming wheel; row-column bare electrodes are of row-column electrode array, producing a parallel high-voltage electric field, quick dehydration of crude oil based on row-column parallel high-voltage electric field is carried out in a dehydration separation tube, and residual water phase in the pre-separated crude oil is removed; the qualified crude oil is discharged from an oil discharge pipe; a water discharge pipe discharges low-oil-content produced water according to an anti-vortex wheel and an anti-vortex wheel shaft, while preventing the water from producing vortexes.

Description

technical field [0001] The invention relates to a device for underwater direct electric dehydration of crude oil after pre-separation in the field of marine engineering, in particular to an online electric dehydration device for an underwater production system with inclined tube-type row-column electrode arrays. Background technique [0002] At present, the typical oil and gas processing supporting facilities for domestic and foreign offshore platforms, onshore oil production plants and chemical plants are "oil well production→standpipe→offshore platform manifold→three-phase separator→secondary heater→thermochemical separator→increase Pressure pump → electric dehydrator", in which the crude oil electric dehydration treatment technology mainly adopts a conventional tank-type electric dehydrator, which uses an electric field to demulsify the crude oil, and separates and settles the water particles in the oil. The entire crude oil electric dehydration treatment equipment is bulk...

AI Technical Summary

Problems solved by technology

[0002] At present, the typical oil and gas processing supporting facilities for domestic and foreign offshore platforms, onshore oil production plants and chemical plants are "oil well production→standpipe→offshore platform manifold→three-phase separator→secondary heater→thermochemical separator→increase Pressure pump → electric dehydrator", in which the crude oil electric dehydration treatment technology mainly adopts a conventional tank-type electric dehydrator, which uses an electric field to demulsify the crude oil, and separates and settles the water particles in the oil. The entire crude oil electric dehydration treatment equipment is bulky And the separation time is long; in addition, the process before the electric dehydration treatment of crude oil is relatively complicated, and the additional loss of electric energy and heat energy in the gathering, transportation and separation treatment is serious, which greatly increases the electric load of the offshore platform power station facilities and the thermal energy of the thermal station facilities supply

[0003] In order to meet the development needs of offshore deep-water oilfields and marginal oilfields, based on a comprehensive understanding of the problems that proper turbulence can promote the collision and coalescence of dispersed phase water particles, in recent years, researchers from some major oil countries in Europe and the United States have broken through the structural design of conventional crude oil dehydrators. The inertial thinking mode proposes a dehydration scheme that separates the two processes of water particle coalescence growth and gravity settlement, that is, compact crude oil dehydration technology. The corresponding representative products include the InLine ElectroCoalescer (InLine ElectroCoalescer ), the Compact Electrostatic Coalescer of Kvaerner Process Systems in Norway, etc. The defect of this technology is that the compact dehydration tank usually adopts a horizontal type, and the water particles that coalesce and become larger in the electric field may be damaged by shearing effect and break again, which affects the subsequent separation process and separation effect such as gravity sedimentation

However, very few scientific research institutes in China have only begun to pay attention to efficient and compact oil-water separation technology in recent years, among which the research on compact electric dehydration technology for offshore platforms is still in the experimental research stage; Equipment research is still in its infancy and laboratory research at home and abroad

Images