摘要
随着计量科学发展,测定不确定度已广泛应用于各领域,它可反映出实验室的试验水平和结果的可靠程度。为了提高G级油井水泥质检试验数据的准确性,对其所有的物性参数检测过程进行研究,通过建立数学模型,从测量重复性、样品称量、水泥浆配制等方面进行分析,建立了适用于G级油井水泥稠化时间、游离液含量和抗压强度试验不确定度评定的典型方法。评定结果显示,包含因子K取2,G级油井水泥稠化时间为103.3 min时,其扩展不确定度为1.09 min;游离液含量为3.71%时,其扩展不确定度为0.71%;38℃抗压强度为5.44 MPa时,其扩展不确定度为1.23 MPa。并确定了试验过程中不确定度的来源,主要为样品测量重复性,质量称量次之。在实际检测中,应从拌合材料的称量过程、增加样品平行测定次数等方面来降低试验误差。
With the development of metrology,measurement uncertainty has been widely applied to many fields,which reflects the testing level of a laboratory and the reliability of testing results.In order to improve the accuracy of the quality testing data of grade G oil well cement,the testing processes of all physical parameters were investigated and analyzed in respect of testing repeatability,sample weighing,and cement slurry preparation by building a mathematical model.A typical method to evaluate the uncertainty in testing the thickening time,free liquid content and compressive strength of grade G oil well cement was established.The evaluation results show that when the inclusion factor K is 2,and the thickening time of grade G oil well cement is 103.3 min,its spread uncertainty is 1.09 min;when the free fluid content is 3.71%,its spread uncertainty is 0.71%;when the compressive strength at 38℃is 5.44 MPa,its spread uncertainty is 1.23 MPa.The factors affecting the uncertainty in the testing process were determined,which are mainly the testing repeatability of samples,and followed by the mass weighing of samples.In actual testing,the testing error should be minimized by improving the weighing process of the mixed materials and increasing the number of repeated testing of samples.
作者
狄新叶
马疆
齐静
李良兵
张伟
DI Xinye;MA Jiang;QI Jing;LI Liangbing;ZHANG Wei(Research Institute of Engineering Technology,CNPC Western Drilling Engineering Co.,Ltd.,Karamay 834000,Xinjiang,China;Research Institute of Engineering Technology,PetroChina Xinjiang Oilfield Company,Karamay 834000,Xinjiang,China)
出处
《新疆石油天然气》
CAS
2022年第4期12-19,共8页
Xinjiang Oil & Gas
基金
中国石油西部钻探有限公司科研基金项目“油基钻井液注水泥塞技术研究”(2020XZ018)。
关键词
G级油井水泥
不确定度评定
固井质量
稠化时间
游离液含量
抗压强度
grade G oil well cement
uncertainty evaluation
cementing quality
thickening time
free fluid content
compressive strength
