Thermal composite huff and puff synergistic system for offshore low-yield heavy oil cold production well and operation method

Abstract

The invention discloses an offshore low-yield thickened oil cold production well thermal composite huff and puff synergistic system which comprises a wellhead Christmas tree, an electric pump production pipe column, a hot water injection pipeline, a mud tank, a medicament tank and a nitrogen making device, one end of the hot water injection pipeline is connected to an oil pipe wing valve, and the other end of the hot water injection pipeline is connected with platform hot water; a composite synergistic agent A is stored in the mud tank, and the mud tank is connected to the hot water injection pipeline through an agent injection pipeline A; a composite synergistic agent B is stored in the agent tank, and the agent tank is connected to the hot water injection pipeline through an agent injection pipeline B; and the nitrogen making device is connected to the sleeve wing valve through a nitrogen injection pipeline. The operation method comprises the steps that hot water, the composite synergistic agent A, the composite synergistic agent B and nitrogen are injected into an oil reservoir through a crude oil cold production pipe column, and after injection is finished, well soaking is conducted for a period of time, and a pump is started for production. According to the invention, the synergistic effect of heat, gas and chemical agents can be fully exerted, and the production degree of the low-yield heavy oil reservoir is improved, so that the recovery rate of heavy oil is greatly improved.

Description

technical field [0001] The invention relates to a thermal recovery and development oil production process of an offshore heavy oil oilfield, in particular to a thermal compound throughput and efficiency enhancement system for an offshore low-yield heavy oil cold recovery well and an operating method thereof. Background technique [0002] Heavy oil steam huff and puff thermal recovery refers to the continuous injection of a certain amount of high-temperature and high-pressure steam into a heavy oil well in a short period of time, and then the well is soaked for 5-7 days to spread the heat of the steam to the reservoir, and then start the pump to start production. When the instantaneous oil production Or after the bottom hole flow temperature drops to a certain level, it will enter the next round of steam injection, brine, and oil production. Through repeated injection of high-temperature and high-pressure steam, multiple rounds of cycle cycle can achieve the purpose of improvi...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the limitations of single technology existing in the existing offshore heavy oil recovery technology, and provide a thermal compound huff and puff efficiency enhancement system and its operation method for cold recovery wells with low production heavy oil in the sea, which can be used according to the wellhead and pipe The temperature-resistant characteristics of the column implement thermal composite synergistic technology to improve the production effect of low-yield cold recovery heavy oil wells. The invention combines the characteristics of heat-gas-agent, and can lay a technical application foundation for the development of offshore low-yield heavy oil cold recovery wells. , which has very important practical significance for improving the development effect of offshore low-yield heavy oil cold recovery development wells

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