摘要
松辽盆地大庆油田徐深气田火山岩储气层由于天然裂缝发育及局部构造变化大,从而导致压裂中出现高滤失、高停泵压力梯度以及近井高摩阻等疑难问题。为进一步提高疑难储层改造的施工成功率,基于以往对徐深气田火山岩储层测试压裂方法(传统"G函数"模型,二维)研究的成果,建立了更适合该气田的火山岩储层压裂参数解释的扩展"G函数"模型(三维)。选取11口井共31层段进行现场实验,包括了天然裂缝较发育、天然裂缝极其发育、低滤失、高度衰退、复合型5种"G函数"图版类型,其中仅有4个层设计加砂符合率低于80%,其余27层设计加砂符合率均高于80%。现场应用情况的统计结果表明,新理论模型使得压裂设计加砂符合率由72.4%提高到87.1%,从而更好地解决了火山岩难压储层改造成功率低的问题,为该类储层压裂成功率的提高提供了理论基础,对水力压裂技术在裂缝性火山岩储层中的应用具有重要意义。
High leak-off, high ISIP （instantaneous shut-in pressure） and high friction near wellbore resulted from natural fracture development and rapid structural changes of volcanic layers in the Daqing Xushen Gas Field, Songliao Basin. In order to improve the success rate of fracturing of tough reservoirs in this field, the generalized ＂G Function＂ theoretical model （3D）, based on the previous minifrac method （2D）, was built for the interpretation of fracturing parameters in favor of volcanic beds in this field. Specifically, the total 31 strata from 11 wells were selected for field experiment to work out the five ＂G Function＂ type curves according to different features of the selected strata with comparatively developed natural fractures, extremely developed natural fractures, low level of leak-off, fracture-height recession, and the integration of the former four cases. As a result, the coincidence rate of sand fracturing design was greater than 80M for 27 strata. The statistics of field application results indicates that the new theoretic model made the coincidence rate of sand fracturing design increased from 72.4% to 87.1 %, thus effectively resolving the problem of low fracturing success rate in such tough volcanic beds. The new model introduces a theoretical principle for improving the fracturing success rate and is of great significance to the application of hydraulic fracturing especially in fractured volcanic beds.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2013年第4期61-65,共5页
Natural Gas Industry
基金
中国石油天然气股份有限公司油气勘探重点工程技术攻关项目
关键词
松辽盆地
徐深气田
火山岩
压裂
测试
扩展“G函数”理论模型
应用
成功率
Songliao Basin
Xushen Gas Field
volcanic layer
fracturing
test
generalized ＂G Function＂ theoretical model
application
