新型耐高压封隔回接插头的研制与应用

针对常规回接插头密封不严的问题研制了一种新型尾管封隔式回接插头，它同时具有回接、封隔两种功能，具有双保险的密封功效。进行了胶筒的压胀试验、接触应力的测试等多项单元试验。分析了胶筒的密封机理、松弛规律。样机试制后，分别进行了密封单元试验、机构功能试验及整体台架模拟试验，各项性能指标全部达到设计要求。在四川、胜利、渤海等油田和地区的现场应用表明，该封隔回接插头结构合理．密封可靠。操作简便，有效解决了回接固井过程中的气密封难题．具有极大的推广应用价值。

The Development and Application of New-style High-pressure-resistant and Packer-attached Tie-back Assembly

In order to solve the sealing leakage problem of conventional tie-back assembly, a new type of packer-attached tie-back assembly has been developed. It has not only the function of tie-back and sealing, but also the efficacy of double sealing. The sealing ability and relaxation method are analyzed during the compression testing, contact stress testing and some other related tests of the rubber sleeve. Sealing parts testing, function testing and simulative testing are conducted on the sample machine. The result shows that all of the performance parameters meet the designed requirements. Several sets of this equipment have been applied in Sichuan, Shengli, Bohai and some other Oilfields and have achieved good effect. The field application shows that the structure of this new tool is rational, the sealing is tried and the operation is convenient. It has effectively solved the sealing leakage problem during the tie-back process of cementing and therefore of tremendous promotion and application value.