机液复合全通径丢手工具的研制及应用

Design and Application of the Aechanical&Hydraulic Disconnector with Full Bore

针对超深碳酸盐岩长裸眼井酸压完井中常规丢手工具可靠性及通径能力不足的问题,研制了一种新型机液复合全通径丢手工具。该丢手工具集成机械丢手工具和液压丢手工具的优点,采用棘爪式承载结构保障在深井管柱下放过程中,对丢手工具的高抗拉需求,利用压差滑套作为棘爪解锁机构,实现工具全通径,棘爪解锁后再依靠机械剪切销钉进行管柱高效丢手。新研制的丢手工具,既能保障深井长裸眼内完井管具的安全下入及后期顺利丢手,又避免了管柱缩径节流问题,有效降低长酸压管柱摩阻,同时也为后期修井作业提供更多选择性。通过有限元分析,室内整机试验及现场应用评价,验证了新研制的机液一体全通径丢手工具性能的可靠性及实用性,累计应用46井次,一次到位和丢手成功率均为100%,其中最深7178.94 m,最大井斜角92.20°,具有广阔的应用前景。

A new type of mechanical and hydraulic disconnector with full bore has been developed to address the shortcomings of conventional disconnectors,including insufficient capacity,reliability,and bore during acid fracturing completion in wells with long open holes in ultra-deep carbonate reservoirs.This disconnector incorporates the advantages of both mechanical and hydraulic disconnectors,employing a pawl structure to guarantee the high bearing demand during the pipe string tripping process in deep wells.A sliding sleeve hydraulic relying on pressure is employed as the pawl release mechanism to achieve full bore.Subsequent to the release of the pawl,a mechanical shear pin is utilized to facilitate the efficient release of the pipe string.The newly developed release tool ensures the safe entry and smooth release of the completion string in deep and long open holes,while also avoiding the problem of throttling in shrinkage pipe.This effectively reduces the frictional resistance,thereby providing more selectivity for later workover operations.The reliability and practicality of the newly developed tool have been effectively verified through finite element analysis,indoor testing,and on-site application evaluation.The tool has been applied a total of 46 times,with a 100%success rate.The deepest application was at a depth of 7178.94 m,with a maximum deviation angle of 92.20°.It has considerable potential for application and offers significant economic benefits.