Abstract: As some oil and gas fields in the East China Sea enter the mid to late stage of development， the stratum pressure has significantly decreased， and the wellhead pressure of some production wells has fallen below the process pressure， making it impossible to achieve self-spraying production. To further enhance the recovery rate of the gas fields， a multistage depressurization system is constructed based on the characteristics of the oil and gas processing processes of various platforms in the East China Sea. This system integrates overall， local， and single-well depressurization strategies， analyzes and plans production facilities， improves equipment selection and technological process， and forms a highly adaptable and effective depressurization production mode. The multistage depressurization system effectively achieves stable and increased production in oil and gas fields， providing a feasible reference plan for the deep exploration of low yield and low efficiency wells in offshore oil and gas fields in the future.

Key words: the East China Sea oil and gas fields, multistage depressurization, process optimization, external pressure