Experimental facility of bent pipe sand blocking and vertical pipe sand carrying in transport process of offshore oil and gas

Abstract

The invention discloses an experimental facility of bent pipe sand blocking and vertical pipe sand carrying in transport process of offshore oil and gas. The facility comprises a vertical pipe segment, a bent pipe segment, an adding sand tank, a gas supply system, a water supply system, a data-collection system and a sand movement detection system. The vertical pipe segment and the bent pipe segment forms one-piece L-shaped segment, and the gas supply system and the water supply system are both connected to the gas-liquid mixing device and then the gas-liquid mixing device is connected to the adding sand tank and the bent pipe segment and the vertical pipe segment in turn. The data-collection system is used for respectively collecting the pressure signals in the gas supply line and gas-liquid mixing line and the vertical pipe segment and the bent pipe segment, the sand movement detection system is used for detecting the sand condition in the bent pipe segment and the vertical pipe segment. The facility is capable of detecting the movement condition of the sands of different particle sizes and meanwhile obtaining the condition needed when the sands block the bent pipe and require restart in the same size condition, and providing evidence to the sand-blocking risk assessment of pipes happens in different working conditions.

Description

technical field [0001] The invention belongs to the technical field of offshore oil and gas exploitation, and in particular relates to an experimental device for sand plugging of elbow pipes and sand carrying in standpipes in the process of offshore oil and gas transportation. Background technique [0002] During the extraction of subsea oil and gas, after being filtered by the wellhead equipment, the well flow medium still carries tiny sand particles and trace gases. With the change of flow velocity and direction of movement during the transportation process, especially when the liquid flow velocity is small, the sand particles are extremely It is easy to deposit in the bend section and standpipe section with large curvature in the subsequent pipeline transportation process, and in severe cases, it will cause blockage and affect normal production. [0003] In addition, the sedimentation characteristics of particles are significantly affected by the flow characteristics of t...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of elbow sand plugging and standpipe sand carrying in the process of offshore oil and gas transportation, the present invention provides an experimental device for elbow sand plugging and riser sand carrying in the process of offshore oil and gas transportation. At the same time, the conditions required for restarting after sand blockage under the condition of equal-sized elbow section are obtained, which provides a basis for the risk assessment of sand blockage in pipelines under different transportation conditions, and realizes the safety and security of offshore oil and gas. Efficient Production Operations

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