特低渗透油藏水平井—直井混合井网压裂产能理论研究  

Theory on Productivity of Fractured Well with Mixed Well Patterns of Horizontal and Vertical Wells in Ultra-low Permeability Reservoirs

作　　者：高瑞民 王小锋 

机构地区：[1]陕西延长石油(集团)有限责任公司研究院,陕西西安710075

出　　处：《非常规油气》2014年第2期31-36,共6页Unconventional Oil & Gas

摘　　要：考虑启动压力梯度的影响,根据等值渗流阻力法及水电相似原理,特低渗透油藏压裂水平井—直井混合井网的渗流场将形成3个区域:一是普通直井产生的平面径向渗流场;二是未受直井和压裂水平井影响的平面渗流区;三是压裂水平井控制的流动区,以此建立了直井—水平井压裂混合井网产能预测模型。模拟分析了启动压力梯度、裂缝条数、裂缝半长、裂缝导流能力对产能的影响,结果表明:启动压力梯度越大,油井日产量越低;随着裂缝条数、裂缝半长、裂缝导流能力的增大,油井日产量逐渐增大,并且裂缝条数、裂缝半长、裂缝导流能力对产能的影响都存在最佳值。Considering impacts of the initiating pressure gradient, the seepage field of the fractured vertical and horizontal and vertical wells in an oil reservoir with ultra-low permeability was divided into three parts according to the law of equiva- lent percolation resistance and the similarity principle of water and electricity. The first area is the planar radial seepage field generated by ordinary vertical well. The second area is the planar seepage zone without the influence of the discharge from the fractured horizontal wells and vertical wells. The third area is the flow region controlled by the fractured horizontal wells. Productivity prediction model of the mixed-well nets of the fractured vertical and horizontal wells was build up to an- alyze the influences of the initiating pressure gradient, the number of the fracture, the fracture half-length and the flow conductivity. Results indicate that the daily production of the oil well reduces as the initiating pressure gradient grows, and the daily production increases with the rises of the fracture number, the half-length and the flow conductivity. Besides, the optimal values of the influence on productivity by these parameters exist.

关 键 词：压裂水平井 混合井网 启动压力梯度 裂缝条数 裂缝半长 

分 类 号：TE348[石油与天然气工程—油气田开发工程]