复合型井组蒸汽辅助重力泄油开发三维势分布规律

发布时间：2018-03-20 06:54

本文选题：复合型井组　切入点：蒸汽辅助重力泄油　出处：《油气地质与采收率》2017年03期 　论文类型：期刊论文

【摘要】：采用单水平生产井与多直井复合型井组蒸汽辅助重力泄油开发的稠油渗流规律与传统井型开发的渗流规律不同,水平生产井使原来直井间的注采关系由平行层面转换为立体区域。立体开发三维渗流数学模型的研究以势原理为基础,将水平生产井渗流过程视为三维线汇,建立以水平生产井水平射孔段两端为焦点的椭球形等势面方程;将直井视为多个纵向叠加的平面点源,建立以直井为中心线的圆柱形等势面方程;利用势叠加原理将二者耦合,推导得到复合型井组驱替过程中的渗流压力场和压力梯度场的数学模型。分析了立体开发的动用范围和重力发生泄流时的作用界限,揭示了重力对蒸汽辅助重力泄油开发效果的影响以及重力对油层内压力场和压力梯度场的作用效果,明确了重力会增大压力梯度场在油层内的作用范围和数值大小,特别是在远井地带或由源汇产生的压力梯度较小的地方,重力与驱替压力耦合后的压力梯度促使油层中被加热的流体向水平生产井发生泄流。
[Abstract]:The percolation law of heavy oil developed by steam assisted gravity drainage with single horizontal production well and multiple straight well composite well group is different from that of traditional well type development. Horizontal production wells change the relationship between injection and production between vertical wells from parallel layers to three-dimensional areas. The study of three-dimensional seepage mathematical model for stereoscopic development is based on the potential principle, and the seepage process of horizontal production wells is regarded as a three-dimensional convergence. The ellipsoidal isopotential equation with the focus on the two ends of horizontal perforating section of horizontal production well is established. The vertical well is regarded as a plane superposition point source and the cylindrical isopotential surface equation is established with the vertical well as the center line. The two equations are coupled by the principle of potential superposition. The mathematical models of percolation pressure field and pressure gradient field in the displacement process of compound well group are derived. The production range of three-dimensional development and the action limit of gravity discharge are analyzed. The influence of gravity on the development effect of steam assisted gravity drainage and the effect of gravity on the pressure field and pressure gradient field in the reservoir are revealed. It is clear that gravity will increase the action range and numerical value of the pressure gradient field in the reservoir. Especially in the far well area or where the pressure gradient caused by the source and sink is small, the pressure gradient after the coupling of gravity and displacement pressure causes the flow of the heated fluid in the reservoir to the horizontal production well.
【作者单位】：东北石油大学石油工程学院;
【基金】：黑龙江省创新训练项目“热力—立体开发致密油基质逾渗演化行为描述实验研究”(201610220047) 东北石油大学青年基金项目“直井辅助SAGD开发热—驱—泄耦合渗流规律与数值模拟研究”(NEPUBS201504);东北石油大学优秀科研人才培育基金“黑龙江省创新后备人才”(SCXHB201602)
【分类号】：TE345

【相似文献】