Method for optimizing pressure grade of main process pipeline of offshore unmanned wellhead platform

Abstract

The invention relates to a method for optimizing the pressure grade of a main process pipeline of an offshore unmanned wellhead platform. The method is characterized by comprising the following steps that 1, natural gas sequentially passes through an SWV and a manual isolating valve to enter the main process pipeline to be collected and then passes through a shutoff valve of a pressure protection system arranged on the main process pipeline to enter an outer transportation subsea pipeline, and an SDV is arranged at an entrance of a subsea pipeline; 2, shorest pressure increasing time dynamic simulation is conducted on the main process pipeline; 3, dynamic simulation of the SWV switching-off time and the main process pipeline pressure increasing condition is conducted, and whether the pressure grade of the main process pipeline can be decreased by one grade or not is determined; 4, if it is determined that the pressure grade of the main process pipeline can be decreased by one grade, the step 2 and the step 3 are repeatedly conducted, whether the pressure grade of the main process pipeline can continue being decreased or not is judged, if yes, the pressure grade of the main process pipeline is continuously optimized, and if not, optimization on the pressure grade of the main process pipeline is completed. The method can be widely applied to pressure grade setting of the main process pipeline of the offshore unmanned wellhead platform.

Description

technical field [0001] The invention relates to a method for optimizing the pressure level of a main process pipeline of an offshore unmanned wellhead platform, belonging to the technical field of offshore petroleum. Background technique [0002] In the process design of offshore unmanned wellhead platform, out of conservative considerations, the upper main process pipeline is generally designed for full pressure according to the shut-in pressure, so that even under the condition of well shut-in pressure, the upper main process pipeline can also ensure that the pipeline will not appear However, there is a lack of research on whether the pressure in the pipeline will reach the shut-in pressure condition, which may cause the pressure level of the overall process pipeline to be set too high, which does not meet the requirements of cost reduction and efficiency increase. Contents of the invention [0003] In view of the above problems, the purpose of the present invention is t...

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Problems solved by technology

[0002] In the process design of offshore unmanned wellhead platform, out of conservative considerations, the upper main process pipeline is generally designed for full pressure according to the shut-in pressure, so that even under the condition of well shut-in pressure, the upper main process pipeline can also ensure that the pipeline will not appear However, there is a lack of research on whether the pressure in the pipeline will reach the shut-in pressure condition, which may cause the pressure level of the overall process pipeline to be set too high, which does not meet the requirements of cost reduction and efficiency increase

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