Underwater large-scale oil-water replacement oil storage and discharge method suitable for offshore oil development

Abstract

The invention discloses an underwater large-scale oil-water replacement oil storage and discharge method suitable for offshore oil development, and belongs to the technical field of large oil-water replacement oil storage and discharge methods for offshore oil development. A first control valve is fixedly assembled on a crude oil guide pipe, and the top end of a water replacement pipe extends out of the sea surface and is fixedly provided with a water replacement tank; a flow meter is fixedly assembled at the input end of the water changing box through a water pipe, a sealing lifting plate is transversely assembled in an inner cavity of the oil storage tank, and a travel switch matched with the sealing lifting plate is fixed to the right side wall of the inner cavity of the oil storage tank, so that same-volume replacement of water and crude oil can be achieved; the oil-water replacement operation of oil development can be achieved, the device can conduct oil-water replacement automatically, the amount of crude oil replaced by the oil storage tank and water in an isovolumetric mode is detected through the flow meter, the measurement precision is high, the position of the sealing lifting plate can be accurately measured through the travel switch, and therefore automatic switching of the oil injection and drainage process and the water injection and oil drainage process can be achieved, and operation is convenient and fast.

Description

technical field [0001] The invention relates to the technical field of large-scale oil-water replacement storage and unloading methods for offshore oil development, in particular to an underwater large-scale oil-water replacement storage and unloading method suitable for offshore oil development. Background technique [0002] Offshore crude oil storage methods can be divided into two modes: dry type and wet type. The dry type oil storage system adopts a storage method similar to that of land storage tanks. The upper space of the crude oil is filled with inert protective gas to eliminate the risk of explosion. The inside of the wet type oil storage structure Always full of oil and water, based on the oil-water replacement technology to realize oil inflow and drainage and water inflow and oil discharge operations, offshore oil storage is an important part of offshore oil development. Currently, the oil storage facilities used in the sea mainly include: floating storage and offl...

AI Technical Summary

Problems solved by technology

[0002] Offshore crude oil storage methods can be divided into two modes: dry type and wet type. The dry type oil storage system adopts a storage method similar to that of land storage tanks. The upper space of the crude oil is filled with inert protective gas to eliminate the risk of explosion. The inside of the wet type oil storage structure Always full of oil and water, based on the oil-water replacement technology to realize oil inflow and drainage and water inflow and oil discharge operations, offshore oil storage is an important part of offshore oil development. Currently, the oil storage facilities used in the sea mainly include: floating storage and offloading For the production of oil storage and unloading ships, gravity oil storage platforms and subsea oil storage tanks, compared with dry oil storage devices, since wet oil storage devices are located underwater, the design process requirements for oil storage and unloading are higher, and the on-site operation is more difficult. It cannot accurately simulate the process of the seawater in the oil storage tank being squeezed out of the oil storage tank during the oil filling process and the process of the seawater in the pool automatically flowing into the oil storage tank under the action of hydrostatic pressure during the oil unloading process. The measurement of the oil storage volume is inaccurate. Therefore, we propose a large-scale underwater oil-water displacement storage and unloading method suitable for offshore oil development

Images