裂缝性地层钻井液漏失动力学模拟及规律

doi:10.7623/syxb201705013

石油学报 ›› 2017, Vol. 38 ›› Issue (5): 597-606.DOI: 10.7623/syxb201705013

裂缝性地层钻井液漏失动力学模拟及规律

王明波, 郭亚亮, 方明君, 张松阳

中国石油大学石油工程学院山东青岛 266580

收稿日期:2016-10-14 修回日期:2017-03-25 出版日期:2017-05-25 发布日期:2017-06-07
通讯作者: 王明波,男,1979年1月生,2001年获石油大学(华东)学士学位,2007年获中国石油大学(华东)博士学位,现为中国石油大学(华东)副教授,主要从事油气井流体力学与工程研究工作。Email:wmbsal@sohu.com
作者简介:王明波,男,1979年1月生,2001年获石油大学(华东)学士学位,2007年获中国石油大学(华东)博士学位,现为中国石油大学(华东)副教授,主要从事油气井流体力学与工程研究工作。Email:wmbsal@sohu.com
基金资助:
中央高校基本科研业务费专项资金项目（16CX05019A）和国家自然科学基金项目（No.51104171）资助。

Dynamics simulation and laws of drilling fluid loss in fractured formations

Wang Mingbo, Guo Yaliang, Fang Mingjun, Zhang Songyang

School of Petroleum Engineering, China University of Petroleum, Shandong Qingdao 266580, China

Received:2016-10-14 Revised:2017-03-25 Online:2017-05-25 Published:2017-06-07

摘要/Abstract

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。

关键词: 钻井液漏失, 粗糙裂缝, 宾汉流体, 漏失速率, 累积漏失量

Abstract:

Well loss is one of the common complex downhole conditions during the drilling in fractured formations. On the basis of fluid dynamics theory, the control equation of fluid loss in 2D rough fractures has been established to basically understand the occurrence mechanism of fluid loss. During the deduction of such equation, drilling fluid is modeled as Bingham fluid and the fracture is described as 2D single fracture with rough surface, index deformation and dip angle. Finite element method is used to solve the fluid loss control equation; based on the created model, the loss laws of drilling fluid in a two-dimension rough fracture has been analyzed. Research results indicate that the smoother the fracture is, the greater the loss rate and the cumulative loss will be; the fracture dip has less impact on loss rate while affects the cumulative loss; the greater the fracture area is, the greater the loss rate and cumulative loss will be; the smaller the fracture length is, the greater the loss rate and cumulative loss will be; the greater the fracture width is, the greater the loss rate and cumulative loss will be; the fluid loss rate and cumulative loss have increased significantly as the downhole pressure difference increases; fluid dynamic shearing stress has less impact on loss rate, but has certain impacts on cumulative loss; the smaller the plastic viscosity is, the greater the loss rate and cumulative loss will be.

Key words: drilling fluid loss, rough fracture, Bingham fluid, loss rate, cumulative loss

中图分类号:

TE283

王明波, 郭亚亮, 方明君, 张松阳. 裂缝性地层钻井液漏失动力学模拟及规律[J]. 石油学报, 2017, 38(5): 597-606.

Wang Mingbo, Guo Yaliang, Fang Mingjun, Zhang Songyang. Dynamics simulation and laws of drilling fluid loss in fractured formations[J]. Acta Petrolei Sinica, 2017, 38(5): 597-606.

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裂缝性地层钻井液漏失动力学模拟及规律

Dynamics simulation and laws of drilling fluid loss in fractured formations

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