石油矿场机械
石油礦場機械
석유광장궤계
OIL FIELD EQUIPMENT
2014年
1期
7-10
,共4页
孙铭新%张大千%步玉环%孙旺
孫銘新%張大韆%步玉環%孫旺
손명신%장대천%보옥배%손왕
大位移井%轴向力%影响因子%挠度%扶正器间距
大位移井%軸嚮力%影響因子%撓度%扶正器間距
대위이정%축향력%영향인자%뇨도%부정기간거
extended reach well%axial force%impact factor%deflection%centralizer spacing
大位移井套管在重力效应作用下使套管偏心并产生挠曲变形，大幅降低水泥浆的顶替效率，影响固井质量，现场一般采用安装扶正器的方法改善套管的偏心；而两扶正器间的套管在井斜的影响下，套管自重会在轴向上产生一定的分力，井斜角越大其分力越大，对套管的挠度产生的影响也越大。采用纵横弯曲梁理论建立了套管挠度计算模型，并定义了挠度影响因子的概念，在此基础上研究了挠度影响因子随轴向力的变化规律及轴向力对套管挠度的影响。研究结果表明：在轴向力对套管挠度的影响方面存在1个临界力，小于临界力时轴向力对套管挠度的影响可以忽略，大于临界力时轴向力对套管挠度的影响显著；临界力的大小与扶正器间距、套管的弹性模量以及套管截面的轴惯性矩的相关性可以忽略。研究结果间接证明：大位移井中下套管作业时，现场利用套管的自重使套管下入预定深度的正确性，可以有效地减小两扶正器间套管的挠曲变形，并对大位移井扶正器的优化设计具有一定的指导意义。
大位移井套管在重力效應作用下使套管偏心併產生撓麯變形，大幅降低水泥漿的頂替效率，影響固井質量，現場一般採用安裝扶正器的方法改善套管的偏心；而兩扶正器間的套管在井斜的影響下，套管自重會在軸嚮上產生一定的分力，井斜角越大其分力越大，對套管的撓度產生的影響也越大。採用縱橫彎麯樑理論建立瞭套管撓度計算模型，併定義瞭撓度影響因子的概唸，在此基礎上研究瞭撓度影響因子隨軸嚮力的變化規律及軸嚮力對套管撓度的影響。研究結果錶明：在軸嚮力對套管撓度的影響方麵存在1箇臨界力，小于臨界力時軸嚮力對套管撓度的影響可以忽略，大于臨界力時軸嚮力對套管撓度的影響顯著；臨界力的大小與扶正器間距、套管的彈性模量以及套管截麵的軸慣性矩的相關性可以忽略。研究結果間接證明：大位移井中下套管作業時，現場利用套管的自重使套管下入預定深度的正確性，可以有效地減小兩扶正器間套管的撓麯變形，併對大位移井扶正器的優化設計具有一定的指導意義。
대위이정투관재중력효응작용하사투관편심병산생뇨곡변형，대폭강저수니장적정체효솔，영향고정질량，현장일반채용안장부정기적방법개선투관적편심；이량부정기간적투관재정사적영향하，투관자중회재축향상산생일정적분력，정사각월대기분력월대，대투관적뇨도산생적영향야월대。채용종횡만곡량이론건립료투관뇨도계산모형，병정의료뇨도영향인자적개념，재차기출상연구료뇨도영향인자수축향력적변화규률급축향력대투관뇨도적영향。연구결과표명：재축향력대투관뇨도적영향방면존재1개림계력，소우림계력시축향력대투관뇨도적영향가이홀략，대우림계력시축향력대투관뇨도적영향현저；림계력적대소여부정기간거、투관적탄성모량이급투관절면적축관성구적상관성가이홀략。연구결과간접증명：대위이정중하투관작업시，현장이용투관적자중사투관하입예정심도적정학성，가이유효지감소량부정기간투관적뇨곡변형，병대대위이정부정기적우화설계구유일정적지도의의。
Because of the gravitational effect,the casing of extended-reach well will engender eccen-tric and bending deformation,which will greatly reduce the cement slurry displacement efficiency and influence cementing quality.Centralizers are usually used to improve casing eccentricity on site.Under the influence of well deviation on casing between two adjacent centralizers,the casing dead weight will produce a certain component force in the axial direction,and the greater of the well deviation,the greater of the load component force,and the greater of the influence on casing bending deflection.Based on the vertical and horizontal bending beam theory,the casing deflection calculation model is established,deflection impact factor is defined,and the relationship between axial force and the deflection impact factor are studied and the casing deflection well as.It is shown that there is a critical force that when the axial force is greater than it,the impact of axial force on the deflection can be ignored,on the contrary,the influence of the axial force on the cas-ing deflection is remarkable.And the relativity between critical force and centralizer spacing,the <br> Young′s modulus,the moment of inertia can be ignored.It shows that,using the dead weight of the casing to run casing can effectively reduce the casing bending deformation between two adja-cent centralizers,and it has a guiding significance to the optimization design of centralizer spacing in extended-reach well.
