完井修井膨胀悬挂器的研制与应用

Technology and application of expandable hanger on completion and workover engineering

针对常规尾管悬挂器的不足,开发出膨胀悬挂器技术。该技术采用了钢管膨胀及高强度橡胶材料作为密封悬挂机构,没有卡瓦机构,集尾管悬挂器及封隔器于一身,解决了尾管头漏失的问题,且内通径远大于尾管内径,相对于常规尾管悬挂器具有诸多的技术优势,是尾管完井技术的最新发展方向。对膨胀悬挂器的膨胀过程进行了有限元分析,对摩擦系数与膨胀压力的关系进行了研究,得出了膨胀压力与摩擦系数的数学表达式。橡胶筒所能提供的悬挂力大小是衡量膨胀悬挂器性能的一个重要指标,对膨胀压缩后的密封橡胶筒所能提供的悬挂力进行了力学计算;对膨胀悬挂器的工作原理及技术特点进行了论述,介绍了膨胀悬挂器尾管完井技术、膨胀悬挂器悬挂小套管修井技术和膨胀管外封隔器悬挂小套管修井技术的技术优势。在永3-侧87、义11-47等21口井对膨胀悬挂器技术进行了现场应用。

With the development of the expandable casing technique,an expandable hanger derived from this technique was developed to compensate the disadvantage of the conventional hanger.This technique innovatively used an expandable steel tube and high-strength elastomer as sealing and hanging facilities without clamps over them,it effectively solved the problem of leakage at the liner head by combining the liner hanger and upper packer together.This technique containing many advantages,such as a much greater inner diameter than that of the liner head,represents a new development orientation in liner completion engineering.The present paper examined the expansion process of expandable hangers by finite element analysis,studied the relationship between friction coefficient and expandable pressure and obtained a mathematical expression for the pressure and friction coefficient of expansion.The suspension force provided by rubber sleeve was an important indicator of the performance of expandable liner hangers,thus the mechanical force provided by the compressed sealing rubber sleeve was calculated.The paper discussed the expansion principle and technical features,and described technical advantages of the expandable hanger completion and workover techniques by the suspension of the small casing and expandable external packer.The expandable liner hanger technique was applied to 21 wells,such as Well Yong3-ce87 and Well Yi11-47.