Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (5): 108-113.doi: 10.12108/yxyqc.20190512

• OIL AND GAS FIELD DEVELOPMENT • Previous Articles     Next Articles

Dynamic and static comprehensive evaluation method for reservoir connectivity of low-permeability oilfield

ZHANG Zhigang1, LIU Chunyang2, LIU Guozhi2   

  1. 1. Well Logging Technology Service Company, PetroChina Daqing Oilfield Company Ltd., Daqing 163414, Heilongjiang, China;
    2. Research Institute of Exploration and Development, PetroChina Daqing Oilfield Company Ltd., Daqing 163712, Heilongjiang, China
  • Received:2018-11-08 Revised:2018-12-24 Online:2019-09-21 Published:2019-09-16

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Abstract: The water drive control degree of block Gu137 in Puxi Oilfield is 79%,while more than 50% of the oil wells in the oilfield are not affected by water injection,indicating that the adaptability evaluation of injectionproduction system by water drive control degree cannot meet the demands of oilfield production. Therefore,the connectivity relationship in the research of injection-production system was subdivided into static connectivity and dynamic connectivity,and the concept of effective connectivity coefficient was proposed,which is the ratio of the thickness of the water injection effect to the static thickness of the sand body. The commonly used(true) water drive control degree was defined as the product of apparent water drive control degree and effective connectivity coefficient. The method implements a phased evaluation of static connectivity and dynamic connectivity. This method was used to analyze the essential difference of poor water injection efficiency between the test area and G137 block in Puxi Oilfield. The former is due to the small size of the sand body and static disconnection, while the latter is due to poor physical properties of the reservoir and dynamic disconnection. Therefore,for lowpermeability oilfields,it is more reasonable to decompose the water drive control degree assessment index of oilfield development into visual water drive control degree and effective connectivity coefficien.

Key words: low-permeability oilfield, water drive control degree, effective connectivity coefficien, injectionproduction system, Puxi Oilfield

CLC Number: 

  • TE343
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