摘要
裂缝闭合后存在支撑剂嵌入现象,在高闭合压力、软地层中尤为显著,支撑剂嵌入导致裂缝缝宽减小、导流能力降低、压后增产效果差。通过微元受力分析确定裂缝岩石面在支撑剂作用下的变形量,各微元弹性变形弹力之和即单颗粒支撑剂在闭合压力下承受的压力,叠加微元变形弹力建立支撑剂嵌入深度定量计算模型,为定量分析支撑剂嵌入程度提供了理论依据。计算并分析了闭合压力、支撑剂粒径、岩石杨氏模量对支撑剂嵌入的影响,对于优化压裂设计、提高压裂改造效果具有十分重要的意义。
The proppant embedment will emerge after fractured closure,which could be more conspicuous especiallyat high closure pressure and/or soft formation.The proppant embedment results in narrow width,low conductivityof fracture,and lead to disadvantage stimulation.Therefore,it is essential to make research on the quantitativecalculation to provide basis for proppant embedment.In this paper,we ascertain the deflection of propping fracturewall through elementary force analysis,and find that the elastic force of deformation concerning every element isequal to particle pressure-bearing at closure pressure.By overlaping the elementary elastic force of deformation,we establish the model of quantitative calculation which provides the theoretical basis for quantifying the degree ofproppant embedment.We analyze the closure pressure,proppant diameter,Young's modulus by calculation.Theachievement has significant meaning in optimizing the fracture design and in improving the fracturing effectiveness.
出处
《西南石油大学学报（自然科学版）》
CAS
CSCD
北大核心
2011年第5期94-97,195,共4页
Journal of Southwest Petroleum University(Science & Technology Edition)
基金
国家自然科学基金(50774064)
四川省教育厅重大培育项目(07ZZ045)
关键词
支撑剂嵌入
闭合压力
嵌入深度
压裂
影响因素
proppant embedment
closure pressure
embedment depth
fracturing
influence factor
