一种环流射吸降压差钻头的研制与应用  

DEVELOPMENT AND APPLICATION OF A KIND OF ANNULAR-SUCTION DIFFERENTIAL-PRESSURE-REDUCING JET BIT

作　　者：苗芷芃 夏宏南 吴涛[2] 王浩宇[3] 王少华 

机构地区：[1]油气钻井技术国家工程实验室防漏堵漏技术研究室 [2]长江大学石油工程学院 [3]长江大学"油气资源与勘探技术"教育部重点实验室 [4]山西省国新能源发展集团有限公司

出　　处：《钻采工艺》2017年第6期1-3,共3页Drilling & Production Technology

摘　　要：目前降低井底压差的工具存在作业复杂、对井底降压效果有限等问题,而射流泵钻头则存在过度依赖井壁间隙的问题。针对以上问题,研制出了一种新型的环流射吸降压差钻头。该钻头采用一种变形设计的射流泵,并在射吸喷嘴外加装射吸套,利用钻头内部的射流泵组及反向喷射的射吸管,实现了涡流-射吸复合降压的效果,并将多个射流泵在钻头内并联共同作用,有效的实现降低井底压差,提高机械钻速。在实际生产应用中,结合邻井钻井效果对比,新型215.9 mm STS636LGRS射吸钻头在部分岩段中具有一定提速效果。The present bottom-hole pressure-differential reducing tools have disadvantages of complex operation and limited pressure reduction. And the jet-pump drilling bit largely depends on the well wall clearance. In order to solve the abovementioned problems, a new-type annular-suction differentialpressure reducing bit is developed. The bit adopts a jet pump with varied design and a suction sleeve is added outside the jet nozzle. The jet pump units inside the bit and the reverse jet suction pipe are combined to realize compound pressure reduction by both vortex and jet suction. Several jet pumps are used in parallel to effectively reduce the bottomhole pressure differential and improve ROP. From the offset drilling data,the new-type215. 9 mm STS636 LGRS jet-suction bit has improved the ROP at some sections.

关 键 词：降低井底压差 射流泵 射吸钻头 研制 应用 

分 类 号：TE921.1[石油与天然气工程—石油机械设备]