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Influencing factors and efficient reservoir stimulation countermeasuresin thick and ultra-deep naturally fractured reservoir

Han Xiu-ling1,2，Yang Xian-you1,2，Xiong Chun-Ming1,2，Shi Yang1,2，Gao Ying1,2，Zhang Fu-xiang3，Lian Sheng-jiang1,2，Li Xiang-dong1,2，Wang Meng1,2，Li Fu-tao1,2   

  1. 1.Research Institute of Petroleum Exploration & Development,PetroChina,Beijing 100083,China;
    2.Key Laboratory of Oil and Gas Production,China National Petroleum Corporation,Beijing 100083,China;3.Tarim Oilfield Company,PetroChina,Koral 841000,China
  • Received:2016-06-03 Revised:2016-09-10 Online:2017-08-10 Published:2017-08-10

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Abstract:

The effect of reservoir stimulation is not ideal for ultra-deep fractured reservoir of Tarim Oilfield Company,so the main factors affecting the reservoir stimulation and influence law of these factors were studied,and the efficient stimulation measures were proposed.Geomechanical studies have shown that the main factors affecting natural fractures opening including natural fracture occurrence,reservoir stress,pore pressure increment caused by the stimulation,the angle between maximum principal stress direction and natural fracture orientation,cohesion and so on.High angle natural fractures are prone to shear failure; the greater the pore pressure increment during stimulation,the greater the stress difference between the maximum and minimum horizontal stress,natural fractures are more easily open by shear failure.The smaller the angle between natural fracture strike and the maximum principal stress direction,the more easily the natural fractures shear failure occurs.Cohesion has a greater impact on natural fractures opening rate,and lower cohesion can greatly increase the natural fractures opening rate.Cohesion drops from 14MPa to 0MPa,natural fractures open rate increases from 11.5% to 71.2%,the crack opening rate increases by 59.7%.Reservoir simulation studies have shown that to improve the longitudinal producing degree is better than lateral producing degree to improve well productivity.By temporarily blocking natural fractures,the higher pump injection to increase bottom hole pressure,and pre-acidification to reduce crack cohesion,the crack opening rate increases,reservoir producing degree and the effect of stimulation are improved greatly.The reservoir stimulation countermeasures are an efficient way to yield higher production in ultra-deep fractured reservoir.

Key words: Ultra-deep reservoir, Natural fractures, Cohesion, Temporary blocking technology, Natural fractures opening

CLC Number: 

  • TE34

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