Offshore large-displacement downhole oil-water separation device with chemical agent injection function

Abstract

The invention discloses an offshore large-displacement downhole oil-water separation device with a chemical agent injection function, belongs to the field of oil and gas production and mainly aims to solve the problems of large oil-water separation treatment capacity of domestic and overseas offshore oilfields and limited space of offshore platforms at present. The device is characterized in that a hydrocyclone and demulsifying agents are applied at the same time, and physical separation and chemical separation are combined, so that separation efficiency is improved remarkably. In the whole device, a power portion comprises a motor, a high-voltage cable connector and a cable; a pressure boosting portion comprises pumps which can be electric submersible centrifugal pumps; an oil-water separation portion comprises the single-stage or multi-stage serial-parallel-connection hydrocyclone, a packer, an outer bypass pipe, a demulsifying agent injection pipe and the like. The device achieves single-well injection-production of the offshore oilfields by separating downhole oil-water mixture of the offshore oilfields, reinjecting separated water into an injection layer and lifting separated oil to the ground. The offshore large-displacement downhole oil-water separation device with the chemical agent injection function has the advantages of capabilities of decreasing treatment capacity of the oil-water mixture of the offshore platforms, reducing oil production cost, improving economic benefit and the like.

Description

Technical field [0001] The invention relates to an offshore large-displacement downhole oil-water separation device with a chemical injection function. Background technique [0002] With the continuous development of offshore oil fields, the water content of oil wells has gradually increased. In order to maintain production, the method of increasing the discharge volume had to be adopted to delay the rate of decline in oil production. At present, most of the blocks of offshore oilfields have water content of over 90% in downhole produced fluids. With the increase of water content, the following problems appear: First, it is necessary to increase the power of the motor to lift a large flow of oil, which consumes more electricity; second, the water content of the oil lifted to the ground increases. , The water treatment process is becoming more and more complex, the facilities are getting larger and the cost is getting higher and higher, especially the contradiction of sm...

AI Technical Summary

Problems solved by technology

This device adopts the combination of multi-stage series-parallel hydrocyclones and injection of chemical agents, and the combination of physical separation and chemical separation, which solves the problems of small processing capacity and low separation efficiency of conventional downhole oil-water separation devices.

Images