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Development of Direct Measurement Technics for Thermophysical Properties of Rock Mass in situ by Well Logging

测井原位岩体热物性直接测量技术发展

基本信息

批准号：
09555318
负责人：
KIYOHASHI Hiroshi
金额：
$ 3.78万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09555318/
关键词：
thermophysical properties of rock mass in situ well log sensor substrate synthetic rubber simultaneous measurements revised hot-wire comparative method borehole diameter hot wire diameter 岩盤熱物性値熱伝導率温度伝導率細線加熱比較法シリコンゴムセンサ曲率

项目摘要

Thermophysical properties of deep reservoir rocks should be directly obtained by a measurement technique in situ, because their values by laboratory measurements using samples might be influenced due to the intracrystalline microcracks originating from a stress released from the core during the drilling. The authors have developed a new method and system for simultaneous measurements of the thermal conductivity, the thermal diffusivity, and the specific heat of rocks in situ at temperatures from 273 to 473K, by applying the transient, hot-wire comparative method. In this study, a hot wire with diameter, d=80, 50 or 30μm and length=50mm was inlaid in the center of the surface of the substrate (elastic silicon gum plate of 40mm×90mm×10mm) used as a reference material. Three K-thermocouples, TィイD20ィエD2, TィイD21ィエD2 and TィイD22ィエD2 of diameter d[μm] were inlaid at xィイD20ィエD2, xィイD21ィエD2 and xィイD22ィエD2[mm] from center of the hot-wire, respectively, in the surface. Temperature rise ΔθィイD20ィエD2 … More at xィイD20ィエD2, and the temperature difference ΔθィイD212ィエD2=(θィイD21ィエD2)-θィイD22ィエD2) between θィイD21ィエD2 at xィイD21ィエD2 and θィイD22ィエD2 at xィイD22ィエD2 against logarithmic time ln(t) and 1/(t), respectively, were used in calculation of the thermal conductivity, λィイD2sィエD2, and the thermal diffusivity, αィイD2sィエD2, respectively. Originally this method is applied for flat boundary surface of half infinite body of the sample whose thermal conductivity is λィイD2FSィエD2 (=λィイD2sィエD2).In the study, the effect of a ratio of the curvature radius of a borehole, R[mm]=D/2 (D: diameter) to the radius of the hot wire, r=d/2, and the ratio to the reference thermal conductivity of the substrate, λィイD2RィエD2, to the sample thermal conductivity of the rocks in situ, λィイD2sィエD2, on measurement values for curved boundary surface of the borehole, λィイD2csィエD2, was studied to evaluate the values of λィイD2sィエD2. Model boreholes from 66 to 120mm in diameter were drilled in each several blocks of rocks having different values of λィイD2sィエD2. Six types of sensors inlaying the hot-wire and the thermocouples having different diameters, d[μm] of 80, 50 and 30 were used. The inlaid positions of xィイD20ィエD2, xィイD21ィエD2 and xィイD22ィエD2 were fixed at 0.5, 2.0 and 4.0 mm, respectively.As the results, suitable design parameters were obtained in order to evaluate the thermal conductivity, λィイD2FSィエD2. If the measured λ-values on the curved boundary surface in the borehole drilled into the subsurface material having λィイD2FSィエD2 were λィイD2CSィエD2, the ratio of (λィイD2CSィエD2/λィイD2FSィエD2) were less than +10% for the ratios larger than D/d=2400, and less than +5% for the ratios larger than D/d=3000, respectively, without dependency of the ratio of (λィイD2SィエD2/λィイD2RィエD2). Probes of prototype No.1 of which substrates were made by synthetic rubber for boreholes having diameter D=116 to 120mm were designed. The substrates are pressurized by compressed air or hydraulic oil, after the probes have been inserted into the borehole. Less

深部储集岩的热物理性质应通过现场测量技术直接获得，因为在钻井过程中岩心释放的应力引起的晶内微裂纹可能会影响使用样品进行实验室测量的热物理性质值。作者研制了一种新的方法和系统，用于在273 - 473 K温度范围内现场同时测量岩石的热导率、热扩散率和比热。本研究以直径为80、50或30μm、长度为50 mm的热线镶嵌在40 mm × 90 mm × 10 mm的弹性硅胶板表面中心作为参考材料。三个K型热电偶，直径为d[μm]的T D20 D2、T D21 D2和T D22 D2，分别镶嵌在表面中距热线中心x D20 D2、x D21 D2和x D22 D2[mm]处。温升Δθ D20 Δ θ D2 ...更多信息温度差Δθ D212 θ D2=在计算热导率、λ max D2 s λ max D2和热扩散率时，分别使用在x max D21 λ max D2处的θ max D21 λ max D2和在x max D22 λ max D2处的θ max D22 λ max D2之间的（θ max D21 λ max D2）-θ max D22 λ max D2）对对数时间ln（t）和1/（t）的关系，α α β D_2和α β D_2分别为α β D_2和α β D_2。该方法最初是针对导热系数为λ D2 FS D2的半无限体的平坦边界面在研究中，钻孔的曲率半径比R[mm]=D/2（D：直径）与热线半径的比值r=d/2，以及与基底的参考热导率的比值λ λ D2 R λ D2，对现场岩石样品的热导率λ_（max）D_（2s）D_（2）与钻孔弯曲界面测量值λ_（max）D_（2s）D_（2）进行了对比研究，以评价λ_（max）D_（2s）D_（2）的值。在具有不同的λ λ η D2值的几个岩石块中钻出直径为66至120 mm的模型钻孔。使用了六种类型的传感器，其嵌入热线和热电偶，具有不同的直径，d[μm]为80、50和30。将x轴D20轴D2、x轴D21轴D2和x轴D22轴D2的镶嵌位置分别固定为0.5、2.0和4.0 mm，得到了合适的设计参数，以评估导热系数λ λ D2 FS × D2。如果在钻入具有λ π ι D2 FS λ π ι D2的地下材料中的钻孔中的弯曲边界表面上测量的λ值是λ π ι D2CS λ π ι D2，则λ π ι D2CS λ π ι D2的比率为（λ λ D2CS λ D2/λ D2 FS λ D2）分别小于大于D/d=2400的比值的+10%和大于D/d=3000的比值的+5%，而不依赖于（λ π ι D2 S π ι D2/λ π ι D2 R π ι D2）的比值。设计了1号原型探头，其基底由合成橡胶制成，用于直径D=116 ~ 120 mm的钻孔。在探头插入钻孔后，通过压缩空气或液压油对基底加压。少