High-pressure gas-liquid injection pressurized oil recovery method and device for deep-water oilfield mudline wellhead leading well

Abstract

The invention discloses a supercharging oil extraction method and a device thereof through guiding high-pressure gas-liquid jet close to a deepwater oil field mud line well opening. The device comprises a high-pressure pipeline and a flow-guiding supercharging device, wherein one opening of the high-pressure pipeline is communicated with an inlet of the flow-guiding supercharging device; the other inlet of the flow-guiding supercharging device is communicated with a fluid pipeline I; an outlet of the flow-guiding supercharging device is connected with an external transmission pipeline; and the high-pressure pipeline, the fluid pipeline and the external transmission pipeline are all provided with valves. With the adoption of the device, one stage supercharging can be realized through the manner that high pressure gas well fluid pressure energy is directly transformed into seabed low pressure oil well supercharging power under a condition that the external transmission pressure of IPSO (international programme on the state of the ocean) is definite; secondary supercharging is realized through the manner that pressure reduction from a mud line well opening to FPSO (floating production storage and offloading) can be effectively reduced by the introduced high pressure gas, so that the oil pressure of a seabed low pressure oil well is greatly lowered, the blowing period is prolonged, and the blowing recovery efficiency is improved.

Description

technical field [0001] The invention relates to a high-pressure gas-liquid injection pressurized oil recovery method and a device for a mudline wellhead leading well in a deep-water oilfield and belongs to the technical field of oil and natural gas production. Background technique [0002] In the process of oil extraction, when the energy in the formation is sufficient, a single oil well will produce spontaneously. Due to the large horizontal and vertical distances (that is, the distance from the mud surface to the sea surface) between the wellhead of a single well and the FPSO (floating oil tanker) in the process of deepwater oilfield development, the oil pressure at the wellhead of the mud line of the oil well must reach a certain value to transport the output mixture. to the FPSO and meet the pressure requirements of the equipment in the station. Therefore, the oil pressure at the wellhead is too high for the Christmas tree on the mud line of the deepwater oil well, whic...

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Problems solved by technology

[0008] The purpose of the present invention is to save energy and increase efficiency and improve the self-spraying recovery rate of subsea oil wells, make full use of the output fluid energy of adjacent high-pressure gas wells, further reduce the oil pressure of low-pressure oil wells in deep-water oilfields, and solve problems caused by remote oil wells or mud line wells. The problem of high oil pressure caused by long-distance transportation provides a method and device for high-pressure gas-liquid injection pressurized oil recovery in wells leading to the wellhead

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