摘要
针对以往模型进行压裂设计与分析方法对结果偏差较大的实际情况,在对经典裂缝延伸和扩展PKN和KGD理论模型研究的基础上,运用断裂力学和流体耦合方法,建立新的缝壁表皮数学模型,获得新的裂缝缝壁表皮效应分段数学函数.将新模型与以往Cinco-Ley模型进行现场参数计算对比,结果表明:以往认为该表皮效应对产量影响只有5%,新模型表明该表皮效应对产量的影响可以达到50%,新模型揭示了以往认为高效压裂工艺下反而压后减产矛盾现象的真正原因.利用新模型指导压裂设计可降低裂缝缝壁表皮对产量的影响,增强压裂设计对储层的适应性和科学性.现场35井次试验表明,采用新模型后在降低成本的情况下,压裂效果增加1.5倍.
The results of hydraulic fracturing design and analysis were obviously mistaken by the former fracture face skin model.In order to reveal this skin effect more accurately,based on the classical theoretic models of perkins,kern and norgren（PKN） and khristianovic,geertsma and dekerk（KGD）,a new mathematical model of fracture face skin with segmentation characteristic was established using fracture mechanics and fluid coupling method.Comparing the new model with the Cinco-Ley model through field data,the results show that the productivity of the Cinco-Ley model was influenced by only 5%,while that of the new model by 50%.This revealed the poor post-fracturing production with fracturing techniques that are regarded as most effective means by many designers.Using this new model,the influence of skin on productivity was reduced and made fracturing treatment more adaptable and scientific.Through field tests on 35 wells,the output was increased 1.5 times and the costs were dramatically cut by new model.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2011年第6期938-942,共5页
Journal of China University of Mining & Technology
基金
国家科技支撑计划项目(2006BA03B03)
关键词
低渗透储层
缝壁表皮
缝内净压力
线性函数
GDK模型
low-permeability reservoir
fracture face skin
net pressure
linear function
GDK model
作者简介
才博（1979-），男，吉林省四平市人，工程师，博士，从事油气井增产技术方面研究．E-mail：boocai123@126．com Tel：13731609327
