Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (4): 150-158.doi: 10.12108/yxyqc.20220414

• PETROLEUM ENGINEERING AND OILFIELD DEVELOPMENT • Previous Articles     Next Articles

Oil-water flow law of Ordovician fractured-vuggy reservoirs in Tahe Oilfield

SONG Chuanzhen1,2, MA Cuiyu1,   

  1. 1. Sinopec Petroleum Exploration and Production Research Institute, Beijing 102206, China;
    2. Sinopec Key Laboratory of Marine Oil & Gas Reservoirs Production, Beijing 102206, China
  • Received:2021-08-04 Revised:2021-11-09 Online:2022-07-01 Published:2022-07-07

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Abstract: Based on the geological and production characteristics of Ordovician fractured-vuggy reservoirs in Tahe Oilfield,the conceptual fracture-vuggy model and actual geological model were established,and oil-water flow law of each model was discussed by using streamline simulation method. The results show that:(1)The fracturevuggy reservoirs in Tahe Oilfield have complex spatial structure composed of caves,pores and fractures. There are four types of caves including unfilled caves,partially-filled caves,fully filled caves and fully filled caves through with fractures. The production characteristics of different types of reservoirs differs greatly,the connectivity between wells is good,but the lateral displacement is weak.(2)The oil-water flow laws are different in different types of fractured-vuggy structure models. In unfilled caves,the fluid flowed uniformly,and the oil-water interface presented a horizontally rise under the displacement of bottom water. For the partially-filled caves,the bottom water coning in the lower filled zones was obvious,while in the upper unfilled zones,the oil-water interface tended to rise horizontally, which resulted in water sealing the remaining oil in the lower caves. In fully filled caves, the characteristics of bottom water coning are obvious,and the oil-water flow laws are similar with sandstone reservoirs. For the fully filled caves through with large-scale fractures,the fracture was a high-speed channel for oilwater flow,where water channeling happened easily. On the side of the filled cave drilled by a production well, water along the fracture was coning to the bottom of the well. However,the crude oil in the cave outside the fracture is basically undeveloped,that is the remaining oil shielded by high-angle fractures.(3)During the natural energy development process,the oil-water flow is mainly vertical and controlled by the scale of the effective reservoirs around the well,and the producing scale of single well is limited. During multi-well production,the streamline between wells is only connected below the oil-water interface and is widely distributed,and there is no or less inter-well interference. During the water-flooding development process,the streamlines between injectionproduction wells are still mainly distributed vertically. The streamline connection is better only in bottom water position. The lateral displacement of injected water is weak.

Key words: fractured-vuggy reservoir, streamline simulation, oil-water flow law, water flooding, carbonate reservoir, Ordovician, Tahe Oilfield

CLC Number: 

  • TE344
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