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Hydraulic Connection Model in Squeeze Preprocessing SAGD Start-Up

  • Lei Zhang
  • Wenying Wu
  • Sen Chen
  • Hongjuan You
  • Botao Lin
Conference paper
Part of the Springer Series in Geomechanics and Geoengineering book series (SSGG)

Abstract

A cross-hole vertical dilation zone is formed, and hydraulic connection is implemented between injection–production inter-well reservoirs. It is the key to success in squeeze preprocessing dual horizontal well SAGD start-up. Normally, the well’s pressure communication is determined by the pressure response between the injector and the producer. However, this pressure response cannot be used to analyze the thermal conformance and inter-well fluid mobility. By using the squeeze preprocessing SAGD start-up job in Fengcheng oil field as an example, this paper proposed a method that calculate the radius and mobility of the dilation zone. This model is based on finite element software ABAQUS and analytical regression analysis. The dilation behavior in oilsands reservoir is modelled by Drake-Prager plasticity model, according to the definition of the ratio method, weight, and multiplication principle. The results show that the hydraulic connectivity coefficient in Fengcheng Oilfield SAGD reservoirs is between 0.6 and  0.8. The greater the coefficient, the bigger the hydraulic extent, and the late preheat the less steam consumption. The fitting effect of model prediction results and the actual monitoring data is good, and the relative error is less than 5%. It shows that the mathematical models of hydraulic connection are valid.

Keywords

SAGD start-up Hydraulic connectivity coefficient Hydraulic sweep radius Fengcheng oilfield 

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Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  • Lei Zhang
    • 1
  • Wenying Wu
    • 1
  • Sen Chen
    • 1
  • Hongjuan You
    • 1
  • Botao Lin
    • 2
  1. 1.Xinjiang Oilfield Company of PetroChinaXinjiangChina
  2. 2.China University of Petroleum (Beijing)BeijingChina

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