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以沈忠厚教授为首的射流科研组在提高射流在井底工作效率的研究方面取得了重要的科研成果,并研制出了加长喷嘴钻头。1989年3月26日由中国石油天然气总公司组织对该项成果进行了技术鉴定。鉴定会上,专家们一致认为该项研究属国内首创,解决了钻井技术中长期未解决的重要理论问题,丰富了淹没非自由射流理论。设计和研制的带硬质合金衬套的加长喷嘴在国内首次较好地解决了在81/2″三牙轮钻头上的使用寿命问题。
Jet research group headed by Professor Shen Zhonghou has made important achievements in research on improving the working efficiency of jet at the bottom of the well and has developed a longer nozzle bit. March 26, 1989 by the China National Petroleum Corporation organized the results of the technical appraisal. Appraisal meeting, the experts agreed that the study is a national initiative to solve the drilling technology in the long-term unresolved important theoretical issues, enriching the theory of submerged non-free jet. The long nozzle designed and developed with carbide bushing has solved the service life problem on 81/2 "tri-cone bit for the first time in China.