Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (4): 155-162.doi: 10.12108/yxyqc.20200416

• OIL AND GAS FIELD DEVELOPMENT • Previous Articles     Next Articles

Influence of imbibition on the development of fractured low permeability conglomerate reservoir: a case stuey from Urho Formation in Mahu oilfield

CAO Xusheng1, HAN Yun1, ZHANG Jizhuo2, LUO Zhiwei3   

  1. 1. College of Energy Resources, China University of Geosciences(Beijing), Beijing 100083, China;
    2. Exploration and Development Research Institute of Zhundong Oil Production Plant, PetroChina Xinjiang Oilfield Company, Fukang 831511, Xinjiang, China;
    3. Xinjiang Xinchun Petroleum Development Co., Ltd, Sinopec, Dongying 257000, Shandong, China
  • Received:2019-12-05 Revised:2020-01-22 Online:2020-08-01 Published:2020-06-16

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Abstract: The development of low permeability conglomerate reservoir in Mahu oilfield is strongly dependent on fractures,and the imbibition between fractures and matrix has an important influence on its development,but the relevant research is very weak at present. The characteristics of imbibition effect of conglomerate of Urho Formation in Mahu oilfield were studied by means of NMR technology,and the imbibition law between fracture and matrix was quantitatively characterized. Furthermore,the influence of imbibition effect on horizontal well development of low permeability conglomerate reservoir in Mahu oilfield was studied by taking the characterization equation into account in the dual-porosity and dual-permeability model. The results show that the conglomerate core from Urho Formation is mainly composed of medium and small pores(T2 <100 ms). The average oil recovery in imbibition effect is 32.43%,the average oil recovery of small pores(T2 <10 ms)is 31.27%,and that of medium pores(10 < T2 < 100 ms) is 37.11%,and its imbibition law is in good agreement with the improved MA index transport model. According to the experimental results based on the dual-porosity and dual-permeability model, after five years of horizontal well development,the fracture recovery was reduced by 24.3%,the matrix recovery was increased by 4.6%,and average recovery was increased by 2.0%. This study is of guiding significance for formulating scientific measures of EOR in the later stage.

Key words: imbibition effect, fractures, low permeability, conglomerate reservoir, dual-porosity and dualpermeability, Urho Formation

CLC Number: 

  • TE348
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