Automatic chemical injection device for ocean oil field well shutdown

Abstract

The invention discloses an automatic chemical injection device for ocean oil field well shutdown. The automatic chemical injection device for ocean oil field well shutdown is arranged on a structuralframe of a Christmas tree and comprises an energy accumulator of pre-charging chemical agents, a pressurized assembly and an underwater control module, wherein a hydraulic line is arranged at an outlet of the energy accumulator; the pressurized assembly comprises a booster pump and a booster pump control module controlling the booster pump to start and stop, an inlet of the booster pump is connected with the hydraulic line, and a pipeline of an outlet of the booster pump is connected to an oil outlet opening position of a throttle of the Christmas tree; and the underwater control module is connected with the pressurized assembly through a cable, and the underwater control module is further connected with a sea surface operation platform through an umbilical cable. The sea surface operationplatform controls the start and stop of the booster pump through the booster pump control module. According to the automatic chemical injection device for ocean oil field well shutdown, a special-purpose methyl alcohol injection pipeline in the umbilical cable of an ocean oil field can be omitted from systematic design, the total use level of methyl alcohol injection is reduced, and costs of ocean oil field well shutdown operation are saved.

Description

technical field [0001] The invention relates to the field of oilfield equipment, in particular to an automatic chemical injection device for well shut-in in offshore oilfields. Background technique [0002] After long-term well shutdown in offshore oilfields, the crude oil inside the production facilities located on the seabed gradually loses to the surrounding seawater environment due to heat, and hydrates will gradually form inside the facility pipelines, causing blockage of oil pipelines. When the well is reopened, internal hydrate blockage will affect the safety of underwater production flow in offshore oilfields. At present, after the well is shut down in the offshore oilfield, the chemical injection module of the offshore operation platform is generally injected into the downstream of the Christmas tree through the chemical injection pipeline of the submarine umbilical cable, so as to suppress the crude oil hydrate in the downstream pipelines such as jumper pipes, mani...

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Problems solved by technology

However, the above method needs to design a special methanol injection pipeline in the umbilical cable, and during the injection operation, methanol is pumped from the sea surface platform to the seabed through the umbilical cable with a length of several thousand meters. The operation process consumes a large amount of methanol, and the cost is high.

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