Research On Deep Condensate Recovery Technology Of TLM Gas Field

The condensate gas in our country contains much ethane, which has great recovery value, but there is not any recovery of ethane in condensate gas field in our country. At present, ethane only be recovered from oil associated gas in our country, and the ethane recovery process is simple, the amount is small, the recovery is low, and the process energy consumption is high. Therefore, research of ethane recovery process and system heat integration technology can improve the level of utilization of domestic oil and gas resources, which is of great important to the economic development of the condensate gas field.In order to improve the ethane recovery process system heat integration, and ensure the economical and efficient operation of ethane recovery device, this paper studied on the multi-stream heat exchanger networks optimization design and designed of multi-stream heat exchanger networks of HPA and RSV process according to the process characteristic. The study shows that the design of multi-stream heat exchanger networks of NGL recovery system should be controlled according to the process characteristics, instead of blindly pursuing the highest amount of energy recovery. And this paper studied on the optimum feed location of the demethanizer with sensitivity analysis method, and the results showed that the greater the separation factor of column, the higher the recovery rate of ethane, and the lower comprehensive energy consumption of the device.By analyzing technology characteristics of typical ethane recovery processes, this paper established HYSYS simulation process and analyzed the suitability of LSP, HPA, IPSI-1 and HPACR on four kinds of typical feed gas. The analysis results show that RSV and HPA are applicable to recovery of ethane from condensate gas. RSV process has high ethane recovery, can accommodate most natural gas compositions, and inlet pressures above 4MPa are generally preferred. However, the power compression of RSV is high. For HPA process, inlet pressures above 7MPa are generally preferred, but there is an issue that the system thermal integration is not good.In order to increase ethane recovery, reduce the energy consumption of the process, this paper developed an efficient ethane recovery process, High Pressure Absorber Recycle Vapor Process, referred to as HPARV, using high pressure absorption principle and heat exchanger network theory based on the advantages of RSV and HPA process. The HPARV process has the characteristics of high ethane recovery and low energy consumption. The adaptability of HPARV ethane recovery process is studied, the study indicated that the HPARV process can accommodate most natural gas compositions, and inlet pressures above 4MPa are generally preferred, and the HPARV process can effectively reduce system energy consumption while ensuring high ethane recovery rate.This paper takes TLM condensate gas field depth recovery project for example to study on the process of HPARV. Research showed that:under the same ethane recovery (93%), compared with the RSV process which to be used in TLM gas field, the comprehensive energy consumption of the device is reduced by 14.4% by using the HPARV process, which can effectively improve the economic benefit of the ethane recovery unit.