不同组合外边界下多层稠油热采试井模型研究  

Thermal Production Well Test Model of Multi-layer Heavy Oil under Different Combination Outer Boundary

作　　者：瞿朝朝 刘斌 张静 刘玉娟 王立垒 QU Zhao-zhao;LIU Bin;ZHANG Jing;LIU Yu-juan;WANG Li-lei(CNOOC Tianjin Branch, Tianjin 300459, China)

机构地区：[1]中海石油(中国)有限公司天津分公司,天津300459

出　　处：《承德石油高等专科学校学报》2022年第2期31-36,共6页Journal of Chengde Petroleum College

基　　金：国家科技重大专项(渤海油田加密调整及提高采收率油藏工程技术示范):2016ZX05058-001。

摘　　要：为解决海上不同组合外边界下多层稠油油藏定向采油井热采渗流方面缺乏研究的问题,基于渗流力学、数学物理等方法,建立考虑不同组合外边界影响的多层稠油油藏定向采油井热采双区复合试井模型,运用有限差分算法得到各层井底压力的瞬时解,并绘制井底压力双对数曲线。研究表明:双对数曲线呈现6个典型渗流阶段。其中,内区拟径向流段是内区流体加热后流体性质改善的反映,该段结束时刻对应波及距离为加热前缘。外区稠油黏度越大,内外区过渡段“抬升”幅度越大,外区拟径向流阶段在纵坐标上对应的值越大。内外区拟径向流段体现了内区加热流体与外区稠油流体的复合特征。导数曲线后期是多层合采井不同组合边界的特征反映。研究成果为海上多层稠油油藏定向采油井热采的试井问题提供了理论支持。At present,there is a lack of research on thermal recovery flow in directional production wells of multi-layer heavy oil reservoirs with different external boundaries.Based on the methods of seepage mechanics and mathematical physics,a composite well test model is established for directional production of multi-layer heavy oil reservoirs with thermal production of two zones considering the influence of different combinations of outer boundaries.The finite difference algorithm is used to obtain the instantaneous solution of bottom hole pressure of each layer,and the logarithmic curve of bottom hole pressure is drawn.The results show that there are 6 typical seepage stages in the log-log curve.Among them,the quasi radial flow section in the inner region reflects the improvement of the fluid properties after heating,and the corresponding sweep distance at the end of the section is the heating front.The higher the viscosity of heavy oil in the outer zone is,the greater the “lift” amplitude of the ITD in the inner and outer zone becomes,and the greater the corresponding value of the pseudo-radial flow stage in the outer zone on the ordinate is.The inner and outer zones are quasi-radial flow sections,which reflect the composite characteristics of the heated fluid in the inner zone and the heavy oil fluid in the outer zone.The latter part of derivative curve is the characteristic reflection of different combination boundary of multi-layer commingled production well.The research results provide theoretical support for the well test of directional thermal production in offshore multi-layer heavy oil reservoirs.

关 键 词：稠油热采 试井解释 双区复合 压力导数 海上油田 

分 类 号：TE53[石油与天然气工程—油气田开发工程]