考虑地层伤害影响的钻井液侵入模拟研究  

Simulation Study on Drilling Fluid Invasion Considering Formation Damage

作　　者：范宜仁[1,2,3] 王小龙 巫振观 吴俊晨 贾建涛 FAN Yiren;WANG Xiaolong;WU Zhenguan;WU Junchen;JIA Jiantao(School of Geosciences,China University of Petroleum（Huadong）,Qingdao,Shandong 266580,China;Laboratory for Marine Mineral Resources,Qingdao National Laboratory for Marine Science and Technology,Qingdao,Shandong 266071,China;CNPC Key Laboratory of Well Logging,China University of Petroleum,Qingdao,Shandong 266580,China;China Petroleum Technology ＆ Development Corporation,Beijing 100025,China)

机构地区：[1]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [2]海洋国家实验室海洋矿产资源评价与探测技术功能实验室,山东青岛266071 [3]中国石油大学CNPC测井重点实验室,山东青岛266580 [4]中国石油技术开发有限公司,北京100025

出　　处：《测井技术》2018年第4期383-389,共7页Well Logging Technology

基　　金：国家科技重大专项(2011ZX05020-008);国家自然科学基金项目(41474100;41674131;41574118);中国石油天然气集团公司科学研究与技术开发项目(2011D-4101)

摘　　要：当前钻井液侵入模拟多集中于泥饼性质而忽略钻井液固相颗粒及其滤液侵入所造成的地层伤害对侵入规律的影响。为研究考虑地层伤害影响的钻井液侵入规律,基于两相渗流方程,结合泥饼形成机理,建立含泥饼动态生长的钻井液侵入数值模型,充分考虑钻井液固相颗粒及滤液侵入所造成的地层伤害程度,建立近井眼储层孔隙度渗透率模型,实现了考虑地层伤害影响的钻井液侵入数值模拟,模拟结果与实验结果吻合度较高。研究表明,当地层渗透率大于1mD时,考虑地层伤害影响的侵入深度与不考虑地层伤害影响的侵入深度一致;而当地层渗透率小于1mD时,考虑地层伤害影响的侵入深度比不考虑地层伤害影响的侵入深度更浅,且侵入时间越长,侵入深度差异越大。Drilling fluid invasion would change radial formation saturation and resistivity, which brings difficulties to well logging evaluation. Limited by experimental conditions, the current drilling fluid invasion simulation focuses on the effect of mud cake property and ignores the influence of formation damage on fluid invasioncaused by the solid phase particles and invasion of filtrate of drilling fluid. In order to study the invasion of drilling fluid under the influence of formation damage, based on the two-phase seepage equation and the mud cake formation mechanism, a numerical model of drilling fluid invasion with dynamic growth of mud cake was established.By fully considered the effect of invasion of solid phase particles and filtrate of drilling fluid onthe formation damage, the near-wellbore porosity and permeability model was established. The numerical simulation of drilling fluid invasion considering the influence of formation damage was realized, and the simulation results were in good agreement with the experimental results. Studies results showed that when the permeability is greater than 1 mD, the depth of invasion shows no difference taking into account of the formation damage influence. When the permeability is less than 1 mD, the depth of invasion is shallower when considering the influence of formation damage. Furthermore, the longer the invasion time, the greater the difference in invasion depth.

关 键 词：测井评价 钻井液侵入 地层伤害 泥饼动态生长 孔渗模型 数值模拟 

分 类 号：P631.811[天文地球—地质矿产勘探]