A method and device for simulating mud circulation in a riser in deep sea drilling

Abstract

The present invention relates to a mud circulation simulation experiment method and device in a riser in deep sea drilling, comprising the following steps: 1) setting a simulation experiment device for mud circulation in a riser in deep sea drilling; 2) injecting clean water into the experiment device for stirring; 3 ) Drain the clean water and dry the water with an air compressor; 4) Configure the required mud with a mud mixing bucket; 5) Inject the mud into the iron circulation pipe; 6) Use a vacuum pump to extract the air in the iron circulation pipe; 7 ) Turn on the high-pressure circulating mud pump to provide power for the mud flow in the iron circulation pipe to simulate the flow of mud in the pipeline under the non-air-invasion state; 8) inject gas into the iron circulation pipe to simulate the mud flow in the air-invasion state The flow situation in the pipeline; 9) After the experiment, the gas in the mud is precipitated in the release tank, and the mud enters the mud mixing tank for recovery; 10) Perform steps 2) and 3) to clean the experimental device. The invention can be widely used in mud circulation simulation experiments.

Description

technical field [0001] The invention relates to a mud circulation simulation experiment method and device, in particular to a mud circulation simulation experiment method and device in a riser in deep sea drilling. Background technique [0002] Gas invasion means that after the gas extracted from the seabed invades the drilling fluid, it is subjected to seabed pressure at the bottom of the well, and the volume of the gas is small, but as the drilling fluid circulates upwards, the gas rises faster and the gas volume gradually expands, especially The reason is that when the gas is close to the sea level, the expansion speed is extremely alarming. If it is not detected in time, it will cause serious hazards such as blowouts. Therefore, early on-line monitoring of gas kick is an extremely important issue in deepwater drilling. Contents of the invention [0003] In view of the above problems, the object of the present invention is to provide a mud circulation simulation experi...

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Problems solved by technology

[0002] Gas invasion means that after the gas extracted from the seabed invades the drilling fluid, it is subjected to seabed pressure at the bottom of the well, and the volume of the gas is small, but as the drilling fluid circulates upwards, the gas rises faster and the gas volume gradually expands, especially It is that when the gas is close to the sea level, the expansion speed is extremely alarming. If it is not detected in time, it will cause serious hazards such as blowouts.

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