硅油控制自旋射流钻头转速下的黏性力矩特性
TD431; 利用转速可控自旋射流钻头破煤钻孔,可提高水力喷射树状钻孔技术的煤层气开发效率.在钻头有界环空内填充硅油产生的黏性力矩可有效控制钻头转速,但黏性力矩特性仍不明晰.量化分析了不同黏度硅油流变特性;基于自主搭建的流体有界环空受迫流动动力学测试装置,获得了不同转速和有界环空内径下硅油的黏性力矩;阐明了硅油在有界环空内的流动状态,推导了黏性力矩模型并进行了适用性讨论.结果表明:硅油依黏度不同可近似为牛顿流体(黏度≤5 Pa·s)和以Cross流变模型描述的剪切稀化流体.牛顿型硅油在有界环空内受迫流动时表观黏度基本不变,因此其黏性力矩随自身黏度和转速线性增加,随内径增加增速加快,这有利于多压...
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| Published in | 煤炭学报 Vol. 49; no. 11; pp. 4542 - 4552 |
|---|---|
| Main Authors | , , , , |
| Format | Journal Article |
| Language | Chinese |
| Published |
重庆大学煤矿灾害动力学与控制全国重点实验室,重庆 400044%重庆大学资源与安全学院,重庆 400044
01.11.2024
重庆大学资源与安全学院,重庆 400044 |
| Subjects | |
| Online Access | Get full text |
| ISSN | 0253-9993 |
| DOI | 10.13225/j.cnki.jccs.2024.0609 |
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| Abstract | TD431; 利用转速可控自旋射流钻头破煤钻孔,可提高水力喷射树状钻孔技术的煤层气开发效率.在钻头有界环空内填充硅油产生的黏性力矩可有效控制钻头转速,但黏性力矩特性仍不明晰.量化分析了不同黏度硅油流变特性;基于自主搭建的流体有界环空受迫流动动力学测试装置,获得了不同转速和有界环空内径下硅油的黏性力矩;阐明了硅油在有界环空内的流动状态,推导了黏性力矩模型并进行了适用性讨论.结果表明:硅油依黏度不同可近似为牛顿流体(黏度≤5 Pa·s)和以Cross流变模型描述的剪切稀化流体.牛顿型硅油在有界环空内受迫流动时表观黏度基本不变,因此其黏性力矩随自身黏度和转速线性增加,随内径增加增速加快,这有利于多压力梯度下的转速控制.Cross型硅油的剪切应力随剪切速率呈现为增加、减小、再增加趋势,导致其黏性力矩存在由转速和内径协同控制的峰值,且硅油黏度越大,黏性力矩取得峰值时的转速和内径组合越多;为避免Cross型硅油控速时因黏性力矩减小而发生钻头转速失控,需根据转速控制范围合理选择硅油黏度和有界环空内径.在 84%的测试转速和内径组合下,Cross型硅油黏性力矩大于相同条件下的牛顿型硅油,表明前者更适合高压力下的转速控制,后者更适合低压力.本次实验条件下,硅油在有界环空内的受迫流动为层流,推导的牛顿型和Cross型黏性力矩模型分别在内径不超过14.5 mm和等于14.5 mm下具有较高的可靠性,最大误差为14.3%. |
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| AbstractList | TD431; 利用转速可控自旋射流钻头破煤钻孔,可提高水力喷射树状钻孔技术的煤层气开发效率.在钻头有界环空内填充硅油产生的黏性力矩可有效控制钻头转速,但黏性力矩特性仍不明晰.量化分析了不同黏度硅油流变特性;基于自主搭建的流体有界环空受迫流动动力学测试装置,获得了不同转速和有界环空内径下硅油的黏性力矩;阐明了硅油在有界环空内的流动状态,推导了黏性力矩模型并进行了适用性讨论.结果表明:硅油依黏度不同可近似为牛顿流体(黏度≤5 Pa·s)和以Cross流变模型描述的剪切稀化流体.牛顿型硅油在有界环空内受迫流动时表观黏度基本不变,因此其黏性力矩随自身黏度和转速线性增加,随内径增加增速加快,这有利于多压力梯度下的转速控制.Cross型硅油的剪切应力随剪切速率呈现为增加、减小、再增加趋势,导致其黏性力矩存在由转速和内径协同控制的峰值,且硅油黏度越大,黏性力矩取得峰值时的转速和内径组合越多;为避免Cross型硅油控速时因黏性力矩减小而发生钻头转速失控,需根据转速控制范围合理选择硅油黏度和有界环空内径.在 84%的测试转速和内径组合下,Cross型硅油黏性力矩大于相同条件下的牛顿型硅油,表明前者更适合高压力下的转速控制,后者更适合低压力.本次实验条件下,硅油在有界环空内的受迫流动为层流,推导的牛顿型和Cross型黏性力矩模型分别在内径不超过14.5 mm和等于14.5 mm下具有较高的可靠性,最大误差为14.3%. |
| Abstract_FL | Rock-breaking drilling using a self-rotating jet bit with a controllable speed can improve the efficiency of coal-bed methane development using the water jet tree-type borehole technology.The viscous torque generated by filling silic-one oil inside the bounded annular column of the bit can control the speed,but its characteristics are unclear.The rheolo-gical properties of silicone oil with different viscosities were quantitatively analyzed.The viscous torque at various rota-tional speeds and inner diameters was tested by a self-developed fluid-bounded annular column forced flow dynamics device.The flow state of silicone oil was elucidated,and viscous torque models were derived and discussed for applicabil-ity.The research findings are as follows:when the viscosity of silicone oil is below 5 Pa·s,the silicone oil can be approx-imated as a Newtonian fluid,however,at viscosities exceeding 5 Pa·s,the silicone oil exhibits a shear-thinning behavior that can be described by the Cross rheological model.The apparent viscosity of the Newtonian-type silicone oil is un-changed when it is forced to flow in the bounded annular column,thus its viscous torque increases linearly with its viscos-ity and rotational speed,and the growth rate is accelerated with the increase of the inner diameter,which is favorable for the rotational speed control under multiple pressure gradients.However,the shear stress of the Cross-type silicone oil with the shear rate shows a trend of increasing,decreasing,and then increasing,resulting in the existence of the peak in its vis-cous torque that is synergistically controlled by rotational speed and inner diameter,and the greater the viscosity of the sil-icone oil,the more the combination of rotational speed and inner diameter.To prevent a decrease in the viscous torque of the Cross-type silicone oil,leading to a loss of control over the bit speed,it is necessary to select the viscosity and inner diameter according to the speed control range.At 84%of the tested rotational speed and inner diameter combinations,the Cross-type silicone oil viscous torque is greater than that of the Newtonian-type silicone oil under the same conditions,suggesting that the former is better suited for rotational speed control at high pressures,and the latter is better suited for low pressures.Under the present experimental conditions,the forced flow of silicone oil is laminar,and the derived New-ton-type and Cross-type viscous torque models have a high reliability with a maximum error of 14.3%under the inner dia-meters up to 14.5 mm and equal to 14.5 mm,respectively. |
| Author | 卢义玉 周哲 张娣 崔予怀 葛兆龙 |
| AuthorAffiliation | 重庆大学资源与安全学院,重庆 400044;重庆大学煤矿灾害动力学与控制全国重点实验室,重庆 400044%重庆大学资源与安全学院,重庆 400044 |
| AuthorAffiliation_xml | – name: 重庆大学资源与安全学院,重庆 400044;重庆大学煤矿灾害动力学与控制全国重点实验室,重庆 400044%重庆大学资源与安全学院,重庆 400044 |
| Author_FL | ZHANG Di LU Yiyu ZHOU Zhe CUI Yuhuai GE Zhaolong |
| Author_FL_xml | – sequence: 1 fullname: GE Zhaolong – sequence: 2 fullname: ZHANG Di – sequence: 3 fullname: LU Yiyu – sequence: 4 fullname: ZHOU Zhe – sequence: 5 fullname: CUI Yuhuai |
| Author_xml | – sequence: 1 fullname: 葛兆龙 – sequence: 2 fullname: 张娣 – sequence: 3 fullname: 卢义玉 – sequence: 4 fullname: 周哲 – sequence: 5 fullname: 崔予怀 |
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| Copyright | Copyright © Wanfang Data Co. Ltd. All Rights Reserved. |
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| DOI | 10.13225/j.cnki.jccs.2024.0609 |
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| DocumentTitle_FL | Viscous torques characteristics in a self-rotating jet bit with silicone oil-controlled rotational speeds |
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| Issue | 11 |
| Keywords | coalbed methane 煤层气 牛顿流体 shear thinning fluid 流变特性 转速控制 rotational speed control rheological property Newtonian fluid 剪切稀化流体 self-rotating jet bit 自旋射流钻头 |
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| PublicationTitle | 煤炭学报 |
| PublicationTitle_FL | Journal of China Coal Society |
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| Publisher | 重庆大学煤矿灾害动力学与控制全国重点实验室,重庆 400044%重庆大学资源与安全学院,重庆 400044 重庆大学资源与安全学院,重庆 400044 |
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| Snippet | TD431; 利用转速可控自旋射流钻头破煤钻孔,可提高水力喷射树状钻孔技术的煤层气开发效率.在钻头有界环空内填充硅油产生的黏性力矩可有效控制钻头转速,但黏性力矩特性仍不... |
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| Title | 硅油控制自旋射流钻头转速下的黏性力矩特性 |
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