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    • 1. 发明授权
    • Downhole tool for pressure testing of oil and gas wells
    • 用于油气井压力试验的井下工具
    • US5655607A
    • 1997-08-12
    • US505237
    • 1995-08-09
    • Jone MellemstrandBernt Sigve Aadn.o slashed.ySvein ritslandJan Freyer
    • Jone MellemstrandBernt Sigve Aadn.o slashed.ySvein ritslandJan Freyer
    • E21B33/127E21B34/14
    • E21B47/1025E21B33/127E21B34/14
    • A downhole tool for pressure testing of oil and gas wells comprises a generally tubular main tool (1), which is provided with an internal passage (2) and is arranged for attachment at the lower end of a drill pipe string. The main tool (1) is on its outside provided with an inflatable packing element (10), which may be supplied with and relieved of inflating medium via an annular slide valve (5) arranged inside the main tool (1). The slide valve has two active positions, one on each side of a closing initial position, and the slide valve is brought to the active positions by an auxiliary tool (18) which may be run into the passage (2) of the main tool and attached releasably in the slide valve (5). By pressure on the upper side of the auxiliary tool (18), the slide valve may be moved to one of its active positions against the action of a valve spring (6), and by traction in a cable attached to the auxiliary tool (18) the slide valve (5) may be moved to its other position against the action of the same valve spring (6). Upon completed pressure testing and relieving of the packing element (10), the auxiliary tool (18) may be freed from the slide valve (5) by varying the traction in the cable in order to release and free a locking mechanism (36-39) in the auxiliary tool (18), whereupon the latter may be pulled up to the surface.
    • PCT No.PCT / NO94 / 00216 Sec。 371日期:1995年8月9日 102(e)日期1995年8月9日PCT 1994年12月30日PCT PCT。 第WO95 / 18288号公报 日期1995年7月6日油井和气井压力测试用井下工具包括一个大体上管状的主工具(1),其设有内部通道(2),并被布置成附接在钻杆柱的下端 。 主工具(1)在其外部设置有可充气的填料元件(10),其可通过布置在主工具(1)内部的环形滑阀(5)供应并释放膨胀介质。 滑阀具有两个活动位置,一个在关闭初始位置的每一侧上,并且滑阀通过可能进入主工具的通道(2)的辅助工具(18)进入活动位置,并且 可释放地附接在滑阀(5)中。 通过在辅助工具(18)的上侧的压力,滑阀可以克服阀弹簧(6)的作用而被移动到其一个活动位置,并且通过连接到辅助工具(18)的电缆中的牵引力 ),滑阀(5)可以抵抗相同的阀弹簧(6)的作用而移动到其另一位置。 在完成对包装元件(10)的压力测试和释放之后,辅助工具(18)可以通过改变电缆中的牵引力而从滑阀(5)中脱离,以释放和释放锁定机构(36-39 )在辅助工具(18)中,于是后者可被拉到表面。