随钻方位伽马测井探测器直径优化设计  

Optimization of Diameter of Detector for Azimuthal Gamma Logging While Drilling

作　　者：袁超[1] 周灿灿[1] 张锋[2] 程相志[1] 

机构地区：[1]中国石油勘探开发研究院测井与遥感技术研究所 [2]中国石油大学(华东)地球科学与技术学院

出　　处：《石油机械》2014年第3期1-4,共4页China Petroleum Machinery

基　　金：国家重大油气专项"复杂储层油气测井解释理论方法与处理技术"(2011ZX0520-008);山东省自然科学基金项目"脉冲中子地层元素能谱测井方法基础研究"(ZR2012DM002);中石油基础研究项目"可控中子源核能谱多参数测井方法研究"(2011A-3904)

摘　　要：随钻过程中伽马探测器侧装于开槽钻铤中,其尺寸受钻铤限制,通过计算钻铤受到的最大剪切力可实现探测器直径优化选择,但理论计算难以实现。为此,采用有限元方法研究开槽长度、探测器直径、钻井液通道和钻铤尺寸对开槽后钻铤最大剪切应力的影响。研究结果表明,开槽后钻铤受到的最大剪切力随着探测器长度的增加几乎呈指数增大;钻井液通道越大,允许安装的探测器尺寸越小;钻铤尺寸越大,允许安装的探测器尺寸越大。计算得出直径为171.45、184.15、196.85和209.55 mm的钻铤,在钻井液通道直径为57.15 mm时最大探测器直径分别为30.48、38.10、45.72和50.80 mm,在钻井液通道直径为71.12 mm时最大探测器直径分别为24.13、30.48、38.10和44.45 mm。该项研究结果可为随钻方位伽马测井仪器的研制提供理论基础。In logging while drilling, gamma detector is installed laterally in the open-slot drall collar ana its size is restricted by the collar. The selection of detector diameter can be optimized by calculating the maximum shear force of the collar after slot opening. But it cannot be achieved by theoretical calculation. Therefore, the ANSYS fi- nite element analysis method was adopted to study the effect of open slot length, detector diameter, drilling fluid channel and collar size on the maximum shear stress of the collar after slot opening. The research findings show that the maximum shear force of the collar after slot opening is almost of exponential growth with the increase of detector length. The larger the drilling fluid channel, the smaller the size of the detector that is allowed to install. The larger the collar size, the larger the size of the detector that is allowed to install. The calculated diameters of collar are 171.45, 184. 15, 196. 85 and 209.55 mm. When the drilling fluid channel diameter is 57.15 mm, the maximum detector diameter is 30. 48, 38.10, 45.72 and 50. 80 mm respectively. When the drilling fluid channel diameter is 71.12 mm, the maximum detector diameter is 24. 13, 30. 48, 38.10 and 44.45 mm respectively.

关 键 词：随钻测井 方位伽马 探测器 ANSYS 优化设计 

分 类 号：TE921[石油与天然气工程—石油机械设备]