CAJ | 학술논문

深井、超深井和大斜度井起下管柱摩阻大，短尾管固井时因尾管短、重量轻易导致丢手不易判断及丢手困难等问题，为此研制了尾管固井用牵制短节。牵制短节设计有锁定机构和解锁机构，在尾管悬挂器坐挂后，采用液压方式实现牵制短节的锁定功能，将尾管串锁定在上层套管上，给尾管串施加一个向下的牵制力，可以通过指重表明确判断丢手是否成功。利用有限元分析校核了牵制短节的强度，结果表明，其强度满足设计要求。地面试验和现场应用表明，牵制短节的锁定功能和解锁功能均能顺利实现，各项技术指标均达到设计要求，能够解决短尾管固井丢手不易判断及大斜度井固井丢手困难的问题。
심정、초심정화대사도정기하관주마조대，단미관고정시인미관단、중량경역도치주수불역판단급주수곤난등문제，위차연제료미관고정용견제단절。견제단절설계유쇄정궤구화해쇄궤구，재미관현괘기좌괘후，채용액압방식실현견제단절적쇄정공능，장미관천쇄정재상층투관상，급미관천시가일개향하적견제력，가이통과지중표명학판단주수시부성공。이용유한원분석교핵료견제단절적강도，결과표명，기강도만족설계요구。지면시험화현장응용표명，견제단절적쇄정공능화해쇄공능균능순리실현，각항기술지표균체도설계요구，능구해결단미관고정주수불역판단급대사도정고정주수곤난적문제。
To address the liner cementing issues such as unsure or difficult release due to short liner length ,light liner weight and high friction in deep ,ultra‐deep and highly deviated wells ,the holddown sub was developed for liner cementing .The holddown sub was designed with locking and unlocking mecha‐nisms .After the liner hanger was set and positioned ,the holddown sub could be hydraulic locked to hold the liner on upper casing and provide downward force for determining the release through a weight indica‐tor .The strength of the holddown sub was verified by finite element analysis and the results met the design requirements .The ground test and field application results showed that the holddown sub had successfully achieve the function of locking and unlocking and each technical index had met the design requirements . T hus ,the holddow n sub could solve the problem of unsure releasing in liner cementing and difficult release in highly deviated wells .