致密油藏压裂水平井Blasingame曲线分析  

Blasingame curve analysis of fractured horizontal well in tight oil reservoir

作　　者：林旺 范洪富[1] 王少军[2] 闫林[2] 陈福利[2] 刘立峰[2] 车树芹[2] LIN Wang;FAN Hongfu;WANG Shaojun;YAN Lin;CHEN Fuli;LIU Lifeng;CHE Shuqin(School of Energy Resources,China University of Geosciences(Beijing),Beijing City,100083,China;PetroChina Research Institute of Petroleum Exploration&Development,Beijing City,100083,China)

机构地区：[1]中国地质大学(北京)能源学院,北京100083 [2]中国石油勘探开发研究院,北京100083

出　　处：《油气地质与采收率》2019年第6期122-128,共7页Petroleum Geology and Recovery Efficiency

基　　金：国家科技重大专项“致密油藏有效开发关键技术”（2016ZX05046-003）;国家“973”计划“陆相致密油甜点成因机制及精细表征”（2015CB250901）

摘　　要：致密油藏渗透率较低,需要应用水平井大规模压裂的方法才能进行有效开发,压裂后形成的基质与裂缝为2种渗流规律差异性较大的介质,需要新的产量分析模型才能适应致密油藏压裂水平井开发动态分析的需求。在对致密油藏基质与裂缝2种介质不同渗流规律研究的基础上,建立水平井多段压裂双重介质耦合产量模型,并应用有限体积法在非结构混合网格的基础上进行模型求解,同时,制作典型致密油藏压裂水平井Blasingame曲线,并对该曲线特征进行分析,将压裂水平井开发生产阶段划分成裂缝线性流、过渡流和边界控制流3个阶段;基质启动压力梯度、裂缝条数、裂缝间距和裂缝长度对Blasingame曲线有着重要的影响,该曲线在后期的边界控制流阶段随着启动压力梯度的增加而线性地平行下移,在中、前期随着裂缝条数的增加而向上分散,在中期过渡流阶段随着裂缝间距与裂缝长度的增加而向上突出,但裂缝间距对曲线的影响更显著。Horizontal wells with large-scale hydraulic fracturing is required for the effective development of the tight oil reservoirs due to extra-low permeability. After fracturing,there exists two porous media with quite different percolation laws,that is matrix and fracture. A new production analysis model is needed to meet the demand of dynamic analysis of fractured horizontal wells in the tight oil reservoirs. Based on the different percolation laws of the matrix and fracture in the tight oil reservoirs,a coupled production model of a multi-stage fractured horizontal well in the dual-media formation is proposed and solved by using finite volume method on the basis of unstructured hybrid grids. Meanwhile,the typical Blasingame curve of the fractured horizontal well in the tight oil reservoirs is obtained,and the characteristics of the Blasingame curve are analyzed. The development stages of the fractured horizontal well can be divided into three stages:fracture linear flow,boundary-dominated flow and transition flow. The threshold pressure gradient,fracture numbers,fracture spacing and fracture length have major effects on the Blasingame curve. Blasingame curve moves down linearly with the increase of threshold pressure gradient in the later stage of boundary-dominated flow,and disperses upward with the increase of fracture numbers in the early and middle stages,and moves up with the increase of fracture spacing and fracture length in the middle transitional flow stage,but the effect of fracture spacing on the Blasingame curves is more significant.

关 键 词：致密油藏 压裂水平井 双重介质耦合产量模型 Blasingame曲线 非结构混合网格 

分 类 号：TE341[石油与天然气工程—油气田开发工程]