Handle Position of the Three-Position Four-Way Directional Control Valve on the Remote Control Console of BOP
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摘要: 为正确操作和合理使用防喷器,确保发生井喷后能及时可靠关井,从分析《井控设备远程控制台三位四通换向阀手柄位置探讨》一文(文献[1])存在的问题入手,再次探讨了防喷器远程控制台三位四通换向阀的工作原理和手柄位置问题.对文献[1]的观点和结论逐条进行了论证,对液压控制原理、液压管路循环流程进行了深入研究,对液压控制的核心问题进行了分析,对不同状态下控制管路中的压力进行了试验验证,对比了手柄在2种不同位置时的效果.研究发现,将手柄从开位或关位扳回中位时,只要操作时间长于1 s,阀后液控管线中的压力即降至接近0 MPa,阀前压力仍保持在8.5~10.5 MPa;手柄在中位时,能够将防喷器、液动阀锁定在相应的位置而不会发生移位,并能保存油量、保持压力、保护管线与防喷器密封件;环境温差变化不会对管线的可靠性和寿命造成影响.研究表明,正常钻井中三位四通换向阀手柄的合理位置为中位;长期将控制防喷器手柄置于开位、控制液动阀手柄置于关位,存在井控安全隐患;国外与国内使用的三位四通换向阀机能不同,待命位置无须相同.Abstract: To operate the BOP and shut-in valves correctly in case of any blowout,this paper restates the principle and handle position of the valve based on the issues indicated in a literature review,including "Discussion on Handle Position of Three-position Four-way Directional Control Valve in Remote Control Console of Well Control System".Views and results in the article were verified individually,and the principle of hydraulic control and hydraulic line circulation process were thoroughly investigated.The hydraulic control was analyzed,and the pressure in control line was tested under different control modes.Then,the results of the two handle positions were compared.The results showed that the pressure ahead of the valve was maintained at 8.5-10.5 MPa as long as operation time was more than 1 second and the pressure in control line behind the valve dropped to about 0 MPa when the handle position switched from open or closed or to neutral,and as long as the handle position was in neutral,the BOP and hydraulic valves could be constantly locked at their appropriate positions,the pressure was maitained,and pipeline and BOP seals were protected.In addition,the temperature difference had no effect on the reliability and life of hydraulic lines. The research results showed that the handle of three-position four-way directional control valve should be kept at a neutral position during drilling.Leaving the BOP handle open and the hydraulic handle closed was dangerous for well control.The three-position four-way directional control valve used abroad is different from that in China regarding its principle,so it is not necessary to maintain the standby position.
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Keywords:
- BOP /
- remote console /
- changeover valve /
- handle position
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