适用于高密度钻井液封隔器锁紧机构的研制  

Research on the Locking Mechanism of Packer for High Density Drilling Fluid

作　　者：薛占峰[1] 韩峰[1] 刘国祥 

机构地区：[1]中国石化石油工程技术研究院 [2]德州大陆架石油工程技术有限公司

出　　处：《石油机械》2016年第12期29-31,共3页China Petroleum Machinery

基　　金：国家科技重大专项"低渗透油气藏高效开发钻完井技术"之课题五"高压低渗油气藏固井完井技术"(2016ZX05021-005)

摘　　要：在钻井液密度和固相含量均很高的西南元坝地区,常规的封隔器锁紧机构容易因沉砂堆积导致其失效。鉴于此,研制了双螺纹卡簧封隔器锁紧机构。双螺纹卡簧内侧采用锯齿螺纹与本体配合,起防退作用,卡簧外侧采用大螺距的T形螺纹结构,以增大卡簧与锁紧套间隙;设立容砂槽,即使固相堆积,仍可保证封隔器正常坐封及锁紧机构的防退,产生抱紧力,提高防退性能。试验及应用结果表明:双螺纹卡簧锁紧机构可以保证封隔器在井下高密度和高固相含量环境中承受70 MPa以上的压差仍不回弹。研究结果可为封隔器的设计提供一定的参考。The conventional packer locking mechanism is prone to fail due to the accumulation of sand in the Southwest Yuanba area, where the drilling fluid density and solid content are very high. To address the issue, a double thread jump ring packer locking mechanism has been developed. The double thread jump ring adopts the serrated thread to cooperate with the body to prevent the retraction. The outer side of the thread adopts the large-pitch T- shaped thread structure to increase the clearance between the jump ring and the locking sleeve. Sand groove is designed to address the solid phase accumulation, and ensure the packer setting and anti-back of locking mechanism, resulting in hold tight force to improve the anti-back performance. The test and application results show that the double-thread jump ring locking mechanism can ensure that the packer with standing the pressure difference of more than 70 MPa in the environment of drilling fluid with high density and high solid content. The study results could provide references for the design of packer.

关 键 词：封隔器 锁紧机构 双螺纹卡簧 防退 

分 类 号：TE925.2[石油与天然气工程—石油机械设备]