摘要
钻井液在页岩钻探中对维护孔壁稳定十分重要,其滤失形成的泥饼对保护储层同样有着举足轻重的作用。为了研究页岩岩粉侵入低固相钻井液中对泥饼基本性能的影响,选取湘西北硅质页岩岩粉为研究对象,通过正交试验设计并对结果进行了极差分析和方差分析。研究结果表明:岩粉的含量是影响泥饼厚度的主要因素;影响泥饼韧度的主要因素为滚动时间以及岩粉的粒径;质量分数为6%的200目岩粉在滚动6 h后形成的泥饼最薄;150目的岩粉在质量分数为6%时滚动12h后形成泥饼的韧度最大;级配为(200+100)目时,质量分数为2%的岩粉滚动24h后形成泥饼最薄;级配为(200+150)目时,质量分数为4%的岩粉在滚动12h后形成泥饼韧度最大。研究结论对钻井液现场的固相控制有积极意义。
Drilling fluid is very important for maintaining the stability of the hole wall in shale drilling.The mud cake formed by the fluid loss also plays a decisive role in protecting the reservoir.In order to study the influence of shale rock powder intrusion into low-solid-phase drilling fluids on the basic properties of mud cakes,the paper selects the siliceous shale powders in northwestern Hunan as the research object,and designs orthogonal experiments.In addition,the test results are analyzed using variance and range,which show that the content of rock powder is the main factor affecting the thickness of the cake.Besides,the main factors influencing the toughness of the cake are rolling time and the powder gradation.The mass fraction of 6% of the 200 mesh rock powder forms the thinnest mud cake after the rolling 6 hours.When the rock powder with a particle size of 150 mesh has a mass fraction of 6%,the toughness of the mud cake formed after rolling for 12 hours are the maximum.For the rock powder with a gradation of(200+100)mesh,the rock powder with 2% mass fraction forms the thinnest mud after rolling for 24 hours.When the gradation is(200+150)mesh,the rock powder with 4% mass fraction forms the greatest toughness of mud cake after rolling for 12 hours.The conclusion of the study has positive significance for the solid-phase control of the drilling fluid.
作者
莫定强
孙平贺
赵斌魁
王靖源
张绍和
曹函
MO Dingqiang;SUN Pinghe;ZHAO Binkui;WANG Jingyuan;ZHANG Shaohe;CAO Han(School of Geosciences and Information Physics,Central South University,Changsha 410083,China;Key Laboratory of Metallogenic Prediction and Geoenvironmental Monitoring of the Ministry of Education,Changsha 410083,China;Arizona State University,Tempe 85282,USA)
出处
《煤田地质与勘探》
CAS
CSCD
北大核心
2019年第2期200-206,共7页
Coal Geology & Exploration
基金
中南大学中央高校基本科研业务费专项资金项目(2018zzts690)
国家自然科学基金项目(41602372)
国土资源部复杂条件钻采技术重点实验室开放项目(DET201612)~~
关键词
湘西北
页岩气
正交设计
钻井液
泥饼
northwest Hunan
shale gas
orthogonal design
drilling fluid
mud cake
