Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (4): 156-165.doi: 10.12108/yxyqc.20210417

• OIL AND GAS FIELD DEVELOPMENT • Previous Articles     Next Articles

Pressure response behavior and application of commingled well in vertical combined boundary reservoir

SHI Wenyang1, CHENG Shiqing1, SHI Zhiliang2, ZHANG Chengwei1, LI Hong1, TU Kun1, ZHANG Yuzhe3   

  1. 1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum(Beijing), Beijing 102249, China;
    2. Sinopec Research Institute of Petroleum Exploration and Production, Beijing 100083, China;
    3. No. 1 Gas Production Plant, Sinopec North China Oil and Gas Company, Zhengzhou 450006, China
  • Received:2021-01-25 Revised:2021-04-18 Online:2021-08-01 Published:2021-08-06

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Abstract: Given current commingled reservoir well test model is single boundary type, this paper takes the doublelayer reservoir as an example to establish a vertical combined boundary（VCB）reservoir model,and the pressure response semi-analytical solution is obtained by Laplace transformation,Bessel function,Stehfest inversion. The pressure response curves of three VCB types were drawn and the flow stages were divided. The effects of VCB types,proportion on the pressure response were analyzed. The result is shown as follows： （1）The "closed and infinite" boundary will cause pseudo-radial flow regime, and the product between the pressure derivative in pseudo-radial flow stage and closed-boundary proportion is constant.（2）The "constant-pressure and infinite" boundary causes the pseudo constant-pressure boundary flow regime,and the pressure derivative slope in pseudo constant-pressure boundary flow stage is linearly related to the constant-pressure boundary proportion. (3）The "constant-pressure and closed" boundary appears the dominant layer boundary flow regime first,followed by the constant-pressure boundary flow regime,and the product between pressure value in constant-pressure boundary flow stage and constant-pressure proportion is constant. It is concluded that the pressure response can directly diagnose the VCB type,and pressure response feature value in the boundary flow stage can quickly determine the VCB proportion. In addition,when the pressure response appears the features of the radial composite reservoir with poor permeability outer zone or dual-porosity reservoir,the well test analysis model should be carefully selected in combination with the actual reservoir geological information.

Key words: multilayer commingled reservoir, vertical combined boundary, seepage flow, well test analysis

CLC Number: 

  • TE353.2
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