An automatic pigging system for deep water underwater pipelines

Abstract

The invention relates to an automatic pipe cleaning system of a deep water submarine pipeline. The system comprises an underwater pipe cleaning power fluid tee arranged on an underwater production system, a first underwater connector, a pipe cleaning power fluid isolating valve, a first pipe cleaning operation safety valve, a pipe cleaning power driving pipeline, a pipe cleaning ball, a pipe cleaning emitter isolating ball valve, a second underwater connector and a production isolating ball valve; the third end of the underwater pipe cleaning power fluid tee sequentially passes through the pipe cleaning power fluid isolating valve and the first underwater connector to be connected with a first end of the first pipe cleaning operation safety valve through a pipeline, and a second end of thefirst pipe cleaning operation safety valve is connected with an inlet end of the pipe cleaning power driving pipeline; an outlet end of the pipe cleaning power driving pipeline sequentially passes through the pipe cleaning emitter isolating ball valve, the second underwater connector and the production isolating ball valve to be connected with the tail end of the underwater production system through a pipeline; a pipe cleaning ball is arranged in the pipe cleaning power driving pipeline in advance. Accordingly, a deep sea marginal oil-gas field can be developed more economically and efficiently, and the oil-gas field pipe cleaning operation cost is lowered.

Description

technical field [0001] The invention relates to the technical field of an underwater oil and gas production system, in particular to an automatic pigging system for deep water underwater pipelines. Background technique [0002] With the rapid growth of the world's offshore oil and gas industry, more and more attention will be paid to the development of marginal oil fields. Due to their small oil reservoir content, it will not be economical to develop them alone. Therefore, their oil and gas products are usually transported to existing The processing is carried out on the facility, and the transportation distance can sometimes reach thousands or even tens of thousands of meters. Flow assurance problems in these pipelines mainly include hydrate formation, clogging, paraffin deposition, bitumen precipitation and scaling. The treatment methods to eliminate these effects mainly include: regular and irregular pigging, injection of chemical agents through control cables and electr...

AI Technical Summary

Problems solved by technology

Because this technology uses two sea pipes, the investment is also relatively large.

In addition, the operation cost of loop pigging operation will be higher due to its greater impact on production (well shutting down, etc.), the need to recover pigging drive fluid from the external pipeline, etc.

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