应用数值模拟软件探究动滤失影响因素  

Study on Factors Affecting Filtration Property of Drilling Fluid with Numerical Simulation Software

作　　者：孙玉学[1] 李城里 白相双[2] 张立春[2] 赵景原[1] 郭春萍 SUN Yuxue;LI Chengli;BAI Xiangshuang;ZHANG Lichun;ZHAO Jingyuan;GUO Chunping(College of Petroleum Engineering,Northeast Petroleum University,Daqing,Heilongjiang 163000;Jilin Oilfield Drilling Technology Research Institute,Songyuan,Jilin 138000)

机构地区：[1]东北石油大学石油工程学院,黑龙江大庆163000 [2]吉林油田钻井工艺研究院,吉林松原138000

出　　处：《钻井液与完井液》2019年第5期581-586,593,共7页Drilling Fluid & Completion Fluid

基　　金：吉林油田公司项目“深层天然气精细评价及效益钻井关键技术研究-德惠地区气藏保护与评价技术研究”(JS2019-W-28-JZ-2-11)

摘　　要：利用数值模拟软件,模拟地层条件下钻井过程中的钻井液动滤失情况,研究了滤失时间、滤液黏度、压差、内泥饼渗透率、外泥饼渗透率对滤失量的影响。模拟结果表明,当地层渗透率为100 mD,外泥饼渗透率小于0.01 mD时,90%以上的压力被外泥饼消耗,外泥饼是控制滤失量的主要因素;当外泥饼渗透率大于0.1 mD时,外泥饼消耗的压力低于总压差的55%,内泥饼及原始地层的渗透率对钻井液的动滤失也有较大的影响。在模拟条件下,压力很快会传递到地层边界,随着时间的变化,地层中相同位置的地层压力逐渐增加,但增加的幅度很小,滤失速率基本为一定值。从模拟结果可以看出,滤失量与滤失时间、压差成正比,与钻井液滤液黏度成反比,同时,滤失量随着外泥饼渗透率的增加而增加,但2者不呈线性关系。Numerical simulation software is used to simulate the dynamic fluid loss of drilling fluid during drilling under formation conditions.The effects of filtration time,viscosity of filtrate,differential pressure,permeability of internal mud cake and permeability of external mud cake on the filtration rate of drilling fluid was studied.It was found through the simulation that when the permeability of formation was 100 mD and the permeability of the external mud cake was less than 0.01 mD,more than 90%of the pressure was contained by the external mud cake,and the external mud cake is the main factor affecting the filtration rate of a drilling fluid.When the permeability of the external mud cake was greater than 0.1 mD,55%of the pressure was contained by the external mud cake,the permeability of the internal mud cake and the formation all contributed to the dynamic filtration rate of the drilling fluid.Under the simulated conditions,the pressure was transmitted to the boundary of the formation quickly,the formation pressure at the same place inside the formation increased gradually and slightly with time,and the filtration rate was basically a constant.From the simulation it can be found that filtration rate is in direct proportion to filtration time,and pressure,and is in reverse proportion to the viscosity of the filtrate of a drilling fluid.The filtration rate,although increases with the permeability of the external mud cake,is not linearly proportional to it.

关 键 词：数值模拟 动滤失 钻井液 

分 类 号：TE254.1[石油与天然气工程—油气井工程]