西南石油大学学报(自然科学版)

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Analytical Solution for Double-horizontal-well SAGD Electric#br# Preheating Model of Heavy Oil Reservoirs

WEI Shaolei1*, Cheng Linsong2, ZHANG Huideng2, HUANG Shijun2   

  1. 1. Petroleum Exploration and Production Research Institute,SINOPEC,Haidian,Beijing 100083,China
    2. College of Petroleum Engineering,China University of Petroleum(Beijing),Changping,Beijing 102249,China
  • Online:2016-02-01 Published:2016-02-01

Abstract:

There are two preheating methods for steam assisted gravity drainage(SAGD),namely the steam circulation method
and electric preheating method. Compared with the steam circulation method,reservoir heterogeneity has a smaller influence
on the electric preheating method and the formation nearby horizontal wells can be heated evenly. Therefore,the viscosity
of oil is reduced and flowing capacity is improved. A mathematical model for SAGD electric preheating method is built and
solved analytically. According to the special well pattern,the superposition principle is employed to deal with the multi-well
interference problem. Meanwhile,variable electric power injection situation is handled. Temperature distribution at different
time is obtained with the new model. The preheating time can be predicted at a given electric power injection mode. The
research shows that in the case of constant total electric energy,increasing the electric power gradually in preheating is the best
injection method and the temperature between wells rises higher than any other injection methods.

Key words: SAGD production, electric pre-heating, superposition principle, multi-well interference, variable electric power
injection

CLC Number: