Reservoir Evaluation and Development ›› 2018, Vol. 8 ›› Issue (6): 77-82.

• Non-conventional Reservoir • Previous Articles     Next Articles

Status and feasibility analysis on improved shale-oil recovery by gas injection

Mei Haiyan1,He Lang1,Zhang Maolin2,Hu Xinrui1,Mao Hengbo1   

  1. 1. School of Petroleum and Natural Gas Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China
    2. No. 12 Oil Production Plant of Changqing Oilfield Company, CNPC, Heshui, Gansu 745400, China
  • Received:2018-04-17 Online:2018-12-26 Published:2018-12-13


Shale oil resources are rich around the world and have extraordinary exploitation prospects. However, drilling horizontal wells and huge amounts of hydraulic fracturing measures had sharply increased the cost. A large number of experiments and numerical simulations showed that the gas injection could significantly improve the shale oil recovery. Nevertheless, this technique had not been implemented to the practical exploitation of shale oil. Consequently, it was still controversial whether shale oil recovery could be optimized through gas injection or not. By the comparison of the gas displacement experiments of the shale cores, the numerical simulation of shale oil recovery by gas injection and the gas injection pilots in practical fields, it was found that the results from experimental conditions and numerical simulation models were different from those in field pilots. Li Chuanliang insisted that the shale reservoir was consisted of myriad micro-lithologic traps. It was concluded that only if the gas was injected after fracturing, or establishing an orthogonal horizontal well pattern to dense the well spacing, would the shale oil recovery be improved. It has essential guidance for the improvement of shale oil recovery in China or even in the world.

Key words: shale oil, gas injection, improved oil recovery, gas drive experiment, numerical simulation, field pilots, feasibility analysis

CLC Number: 

  • TE341