裂缝性地层钻井液漏失动力学模拟及规律

发布时间：2018-04-19 05:20

本文选题：钻井液漏失 + 粗糙裂缝　；参考：《石油学报》2017年05期

【摘要】：井漏是裂缝性地层钻井过程中较为常见的井下复杂情况之一,为从本质上认识漏失的发生机理,以流体动力学为基础,将钻井液看作宾汉流体,裂缝看作是表面粗糙、指数变形、存在倾角的二维单条裂缝,建立了宾汉流体在二维粗糙裂缝内漏失控制方程。运用有限单元法对漏失控制方程进行了求解,基于所建立的模型分析二维粗糙裂缝中钻井液的漏失规律。研究结果表明:裂缝越光滑,漏失速率与累积漏失量越大;裂缝倾角对漏失速率影响较小,对累积漏失量有一定的影响;裂缝面积越大,漏失速率与累积漏失量越大;裂缝长度越小,漏失速率与累积漏失量越大;裂缝宽度越大,漏失速率与累积漏失量越大;井底压差越大,漏失速率与累积漏失量增加明显;流体动切力对漏失速率影响不大,对累积漏失量有一定的影响;塑性黏度越小,漏失速率与累积漏失量越大。
[Abstract]:Well leakage is one of the common downhole complex conditions in fractured formation drilling. In order to understand the mechanism of leakage in essence, drilling fluid is regarded as Bingham fluid and fracture as rough surface on the basis of fluid dynamics.The governing equation of Bingham fluid leakage in two-dimensional rough fracture is established by exponential deformation and two-dimensional single fracture with dip angle.The leakage control equation is solved by finite element method, and the leakage law of drilling fluid in two-dimensional rough fracture is analyzed based on the established model.The results show that the more smooth the fracture, the greater the leakage rate and cumulative leakage rate, the smaller the influence of fracture dip angle on the leakage rate, the bigger the crack area, the greater the leakage rate and cumulative leakage rate.The smaller the fracture length, the greater the leakage rate and cumulative leakage rate; the larger the fracture width, the greater the leakage rate and cumulative leakage rate; the greater the bottom pressure difference, the greater the leakage rate and cumulative leakage rate, and the less the fluid dynamic shear force has the effect on the leakage rate.The smaller the plastic viscosity, the greater the leakage rate and cumulative leakage.
【作者单位】：中国石油大学石油工程学院;
【基金】：中央高校基本科研业务费专项资金项目(16CX05019A) 国家自然科学基金项目(No.51104171)资助
【分类号】：TE254

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