双水平井注蒸汽开采重质油藏GASD产能计算公式的推导与对比  

Derivation and comparison of the GASD productivity calculation formula of steam flooding in dual-horizontal well for recovery of heavy oil reservoirs

作　　者：陈元千[1] CHEN Yuanqian(PetroChina Research Institute of Petroleum Exploration & Development,Beijing City,100083,China)

机构地区：[1]中国石油勘探开发研究院,北京100083

出　　处：《油气地质与采收率》2018年第3期77-81,共5页Petroleum Geology and Recovery Efficiency

摘　　要：BUTLER于1991年提出的双水平井注蒸汽开采重质油藏的原理和方法,受到中外专家和学者的高度重视。然而,BUTLER将该开采技术称为蒸汽辅助重力驱或简称为SAGD是不准确的。因为注入压力是双水平井注蒸汽开采技术的主要驱动作用,重力只起辅助驱动作用,因此,应该将其命名为重力辅助蒸汽驱(GASD)。由于BUTLER在建立蒸汽辅助重力驱产能计算公式时,将达西定律的稳定流量误认为是微分流量,且在公式的推导过程中存在若干错解,因而得到的蒸汽辅助重力驱产能计算公式是错误的。为此,基于BUTLER提出的蒸汽腔加热油层形成的可动油流动模型,应用达西定律的稳定倾斜线性流动方程,得到了双水平井重力辅助蒸汽驱的产能计算公式,并得出水平井的产能与sinθ成正比,与双水平井之间的垂直距离成反比的重要结论。For the development of heavy oil reservoirs,the recovery principle and method of steam injection in dual-hori-zontal well for the heavy oil reservoirs proposed by BUTLER in1991has been paid more attention by the experts and schol-ars at home and abroad.However,the definition of SAGD is inappropriate,because the gravity drainage contributes less than the injection pressure during the process of SAGD.Therefore,the definition of GASD(Gravity-Assisted Steam Drive)was proposed.In the process of BUTLER's derivation of the productivity formula,steady flow of the Darcy's law has been mistaken as differential flow and several wrong solutions existed during the formula derivation,which results in the inaccu-racy of SAGD productivity calculation formula.Based on the model of movable oil formed by steam chamber proposed by BULTER,the tilted linear flow formula of Darcy's law was used to obtain the GASD productivity calculation formula for du-al-horizontal wells.At the same time,important results were achieved and show that the GASD productivity is in direct pro-portion to the sinθand is in inverse proportion to the vertical distance between the dual horizontal wells.

关 键 词：重质油藏 双水平井 注蒸汽 GASD产能计算公式 推导 对比 

分 类 号：TE313.8[石油与天然气工程—油气田开发工程]