缝网压裂技术及其现场应用  

Network fracturing techniques and its application in the field

作　　者：翁定为[1,2] 雷群[1] 胥云[2] 李阳[2] 李德旗 王维旭 

机构地区：[1]中国石油勘探开发研究院研究生部,北京100083 [2]中国石油勘探开发研究院廊坊分院,河北廊坊065007 [3]中国石油浙江油田公司,浙江杭州310023

出　　处：《石油学报》2011年第2期280-284,共5页Acta Petrolei Sinica

基　　金：国家科技重大专项(2008ZX05013-004)"低渗;特低渗油气储层高效改造技术"资助

摘　　要：针对低渗透、特低渗透储层的缝网压裂技术,完善了缝网压裂的概念,指出缝网压裂是在达到预期目标支撑缝长的主裂缝基础上,形成多缝直至形成"缝网"系统。对不同类型的储层,根据弹性力学假设,采用不同的平面模型,分析了形成缝网的力学条件。当施工时裂缝内净压力超过水平主应力差值与岩石抗张强度之和后,可在原始裂缝的基础上形成新裂缝,实现缝网。研究了各种缝网压裂施工方式,提出了目前可应用的缝网压裂施工方法,并指出缝网压裂的发展方向。采用缝网压裂设计理论对F1-15井进行了缝网压裂设计,施工取得成功。试验结果表明,压裂后效果显著,分析显示有多缝形成。In terms of network fracturing techniques for low or ultra-low permeability reservoirs,the present paper supplemented the concept of network hydraulic fracturing by delineating network fracturing that forms multi-fractures even a ＂fracture network＂ system on the basis of forming principle fractures with the predicted supporting fracture length.Different planar models for various reservoirs and elastic hypotheses were used to analyze mechanical conditions for the formation of a fracture network.In practice,new fractures formed on the basis of primary fractures could compose a fracture network when the net pressure within fractures caused by hydraulic fracturing exceeded the sum of the difference between the maximum and minimum horizontal principal stresses and the tensile strength of rocks.Various treatment methods for network hydraulic fracturing were investigated and the one applicable to an individual reservoir with its effect prediction was then worked out.Finally,Well F1-15 was designed and fractured based on this concept of network fracturing.The oil produced by this well after treatment was much more than that of the adjacent wells.The experimental results showed that effects of network hydraulic fracturing were prominent and multi-fractures were formed.Therefore,network fracturing techniques are not only feasible and effective but also greatly promising in application to low permeability reservoirs.

关 键 词：缝网压裂 应力场 净压力 分支缝 临界压力 缝内封堵 

分 类 号：TE357[石油与天然气工程—油气田开发工程]