An analysis method of an underwater emergency well sealing device applied to a daily well blowout gas field

Abstract

The invention relates to an analysis method of an underwater emergency well plugging device applied to a daily blowout flow gas field. The analysis method comprises the following steps: a, collectingdata of a blowout position of an offshore gas field; b, simplifying the model of the underwater emergency well plugging device; c, creating a fluid domain; d, inhibiting an underwater emergency well plugging device, carrying out mesh generation on a fluid domain, and respectively defining a global mesh size, a global volume mesh size and global prism mesh parameters; e, establishing a fluid-solidcoupling analysis model, and obtaining uplift force corresponding to the blowout speed; f, changing the blowout speed, repeating the step e, carrying out multiple sets of simulation, and obtaining blowout fluid uplift force corresponding to different blowout speeds; g, carrying out interpolation on the blowout fluid uplift force corresponding to different blowout speeds obtained in the step f through a linear interpolation method, and obtaining a relation curve of the blowout speeds and the blowout fluid uplift force; h, determining the application range based on the wet weight of the device.The method provided by the invention improves the possibility of reducing cost and increasing efficiency in field construction.

Description

technical field [0001] The invention relates to an analysis method for an underwater emergency well sealing device applied to a gas field with daily blowout flow rate, and belongs to the technical field of gas field sealing device evaluation. Background technique [0002] The underwater emergency well sealing device is installed on the wellhead or the upper part of the underwater blowout preventer, and can perform well shut-in, diversion, well killing, dispersant injection, oil collection and other operations. It is used for emergency rescue after underwater well control measures fail. It is an offshore Key equipment for oil control and emergency rescue after oil spill accident in drilling. In 2010, the blowout accident in the Gulf of Mexico caused major damage, and the loss was as high as 68 billion US dollars. In order to solve the blowout accident, BP manufactured the world's first underwater emergency well sealing device and successfully used it for well sealing. In No...

AI Technical Summary

Problems solved by technology

In November 2019, the first domestic underwater emergency well sealing device jointly developed by CNOOC and North China Rongsheng successfully conducted shallow water sea trials in Yantai. It is of great significance, but there is still no scientific and systematic method to judge the oil field with daily well blowout flow rate that the underwater emergency sealing device can be applied to

However, this technical solution has the following disadvantages: 1. Low efficiency. The flow field analysis method needs to give an initial velocity, and judge whether the device is suitable for this type of blowout through simulation, that is, the finite element simulation needs to be re-simulated according to the change of the blowout velocity. Low efficiency; 2. Lack of rigor. The purpose of the flow field analysis method is to explain that after the device is lowered, it can limit the blowout fluid and change the blowout flow field. , if the supporting force of the blowout fluid is greater than the wet weight of the device, the device will not be able to seal the well or even be lowered; 3. Lack of scientificity, the flow field simulation method is proposed on the basis of the conceptual blowout out-of-control submarine rescue device, That is, the device only belongs to the design stage, and the underwater emergency well sealing device currently developed in my country is quite different from the conceptual design, so the flow field simulation method is not scientific

However, the disadvantages of this method are: to achieve successful shut-in by increasing the quality of the device, it is easy to increase the cost of decentralization; at the same time, there are errors in judgment based on experience, which lacks scientificity and rigor

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