Feasibility Study on Collaborative Development of Gas Storage and Enhanced Oil Recovery

Abstract

Underground gas storage (UGS) is an effective way to alleviate the shortage of natural gas supply and improve oil recovery. Ma 19 block is located in the west of Liaohe Oilfield. It is a gas cap and bottom water reservoir with a production history of more than 48 years since 1973. In the later stage of production, oil production and gas production are extremely low, water content reaches more than 95%, and the benefit is very poor. The block is currently being studied for co-development of enhanced oil recovery in the UGS process. The component model was established by numerical simulation software, PVTI fitting and historical fitting were carried out, and the parameters of each phase in the next 15 years were predicted for the three operating pressure intervals of the underground gas storage and the original water injection recovery plan. It was found that Ma19 block is suitable for the collaborative construction scheme of UGS to enhance oil recovery. The results show 12–26 MPa is the optimal working pressure range of UGS. Compared with the original production scheme, the crude oil production is increased by 13 times and the oil recovery factor is increased by 4.65%. UGS has accumulated 99.7 × 108 m3 of gas injection, 13.83 × 104 m3 of oil production and 96.2 × 108 m3 of gas production in 15 years of operation. The peak load adjustment and supply capacity of natural gas exceeds 550 × 104 m3/d.This paper puts forward the operation strategy of enhancing oil recovery during the operation of gas storage, which can greatly improve oil recovery, gas storage capacity. It provides a certain reference value for enhancing oil recovery through UGS operation in Ma 19 block.