Method for simulating solid hydrate generation, plugging and unplugging in oil and gas pipelines

Abstract

The invention relates to a method for simulating generation, blockage and blockage relieving of a solid hydrate in an oil gas conveying pipeline. The method comprises the following steps: 1) fixing a bent pipeline including a first straight pipe section, a variable bend and a second straight pipe section onto a bracket; 2) vacuumizing the bent pipeline, then using a second manual pump to inject a liquid into the bent pipeline from a second liquid tank; 3) injecting a gas into the bent pipeline through a gas cylinder, until reaching the pressure needs to be simulated; 4) putting the bent pipeline along with the bracket into a temperature control box, and setting a temperature needs to be simulated; 5) using a movable arm to drive a magnetic jacket for driving a movable metal piece to reciprocate along the first straight pipe section; 6) after the hydrate is generated in the bent pipeline, discharging the remaining gas inside the bent pipeline through a discharge port; 7) using the movable arm to drive the magnetic jacket for driving the movable metal piece to move to a position close to the initial end of the first straight pipe section, and stopping moving the movable arm; and 8) using a first manual pump to quickly inject a high pressure liquid into the bent pipeline from a first liquid tank.

Description

technical field [0001] The invention relates to a method for simulating the formation, blockage and blockage removal of solid hydrates in oil and gas transmission pipelines, belonging to the field of offshore petroleum engineering. Background technique [0002] With the increasing depth of offshore oil and gas field development, the laying depth and length of submarine pipelines are also increasing. The harsh natural environment in deep water not only imposes strict requirements on deep-water floating platforms, subsea production systems, offshore operations, etc. Submarine pipelines (from several kilometers, tens of kilometers or even hundreds of kilometers) have brought severe tests. The data from the oil field show that: due to the low temperature and high pressure environment in deep water, solid hydrates are easily formed in deep water oil and gas mixed transportation pipelines, resulting in blockage of pipelines. Especially in undulating sections with uneven seabed t...

AI Technical Summary

Problems solved by technology

At this time, the pipeline has not been completely blocked, and the fluid continues to flow. At the same time, it also brings a strong and continuous impact on the hydrates in the dead corners, making it easier to form hydrates, and the amount of these hydrates is increasing. Under strong impact, it starts to be compacted and agglomerated, eventually causing blockage, which seriously threatens the safe operation of subsea production systems and mixed pipelines

[0003] In order to solve this problem, researchers are doing a lot of research on the formation, plugging and unblocking mechanism of hydrates in oil and gas transmission pipelines. The process of clogging has always been a difficult thing

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