探矿工程-岩土钻掘工程
探礦工程-巖土鑽掘工程
탐광공정-암토찬굴공정
EXPLORATION ENGINEERING (DRILLING & TUNNELING)
2015年
4期
6-12
,共7页
水平井固井%顶替效率%fluent软件%偏心度%冲洗液流变性能%密度差
水平井固井%頂替效率%fluent軟件%偏心度%遲洗液流變性能%密度差
수평정고정%정체효솔%fluent연건%편심도%충세액류변성능%밀도차
horizontal cementing%displacement efficiency%Fluent software%eccentricity%rheological property of flushing fluid%density difference
水平井注水泥过程中，顶替效率的高低受多种因素的影响。其中，套管偏心度、冲洗液流变性能以及冲洗液与钻井液的密度差的影响较为突出。为了解水平井固井注水泥过程中各种影响因素的作用规律，借助流体力学软件Fluent，建立了偏心水平井三维模型，采用流体体积法（ vof）进行了冲洗液顶替钻井液的数值模拟研究。模拟井筒直径为215.9 mm（81/2 in），模拟套管外径为177.8 mm（7 in），环空长度为300 m，冲洗液顶替速度为1 m／s，套管偏心度根据具体算例选取0、0.2、0.3、0.4。模拟结果表明：顶替效率随套管偏心度增加而降低，适当提高水泥浆流性指数，降低稠度系数有利于提高顶替界面的稳定，缩短界面长度，提高顶替效率。当冲洗液与钻井液之间形成正密度差关系时有利于顶替效率的提高。
水平井註水泥過程中，頂替效率的高低受多種因素的影響。其中，套管偏心度、遲洗液流變性能以及遲洗液與鑽井液的密度差的影響較為突齣。為瞭解水平井固井註水泥過程中各種影響因素的作用規律，藉助流體力學軟件Fluent，建立瞭偏心水平井三維模型，採用流體體積法（ vof）進行瞭遲洗液頂替鑽井液的數值模擬研究。模擬井筒直徑為215.9 mm（81/2 in），模擬套管外徑為177.8 mm（7 in），環空長度為300 m，遲洗液頂替速度為1 m／s，套管偏心度根據具體算例選取0、0.2、0.3、0.4。模擬結果錶明：頂替效率隨套管偏心度增加而降低，適噹提高水泥漿流性指數，降低稠度繫數有利于提高頂替界麵的穩定，縮短界麵長度，提高頂替效率。噹遲洗液與鑽井液之間形成正密度差關繫時有利于頂替效率的提高。
수평정주수니과정중，정체효솔적고저수다충인소적영향。기중，투관편심도、충세액류변성능이급충세액여찬정액적밀도차적영향교위돌출。위료해수평정고정주수니과정중각충영향인소적작용규률，차조류체역학연건Fluent，건립료편심수평정삼유모형，채용류체체적법（ vof）진행료충세액정체찬정액적수치모의연구。모의정통직경위215.9 mm（81/2 in），모의투관외경위177.8 mm（7 in），배공장도위300 m，충세액정체속도위1 m／s，투관편심도근거구체산례선취0、0.2、0.3、0.4。모의결과표명：정체효솔수투관편심도증가이강저，괄당제고수니장류성지수，강저주도계수유리우제고정체계면적은정，축단계면장도，제고정체효솔。당충세액여찬정액지간형성정밀도차관계시유리우정체효솔적제고。
There are many factors which affect the displacement efficiency in the cementing process at horizontal wells.In these factors, the eccentricity of casing, rheological property of flushing fluid and density difference between flushing fluid and drilling fluid are prominent.In order to understand the influence of various factors on horizontal cementing, three-di-mensional model of eccentric horizontal well was established by CFD software and numerical simulation study was made on drilling fluid being displaced by flushing fluid by means of VOF method.The inner and outer diameters of the simulated wellbore and casing are 177.8mm(7in)and 215.9mm(8 1/2 in)respectively, the length of annulus is 300m, the displace-ment velocity is 1m/s and the casing eccentricity is selected 0,0.2,0.3 and 0.4 separately according to the specific exam-ple.The simulated results indicate that the eccentricity of casing at horizontal wells is unfavorable to cementing displace-ment efficiency, and increasing flow behavior index and decreasing consistency index are helpful for improving the stability of displacement interface, reducing its length and enhancing displacement efficiency as well.Meanwhile, when the positive density difference between flushing fluid and drilling fluid is formed, it is conducive to the improvement of displacement ef-ficiency.
