CN104632126A - 一种大通径桥塞及其坐封方法 - Google Patents
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- E—FIXED CONSTRUCTIONS
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- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
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- E21B23/00—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells
Abstract
本发明公开了一种大通径桥塞,其中,包括上接头、中心管、引鞋头和桥塞组合件;所述上接头为环状件,固定套接在所述中心管一端的外侧;所述中心管为金属中心管,所述中心管靠近所述上接头的一端设置有可溶球球座,所述中心管为可钻金属件;所述引鞋头为环状件,固定套接在所述中心管另一端的外侧,所述引鞋头上设有用于与套在桥塞中的拉杆固定连接的装置;所述桥塞组合件套设在所述中心管中段的外侧,且位于所述上接头和所述引鞋头之间。本发明还公开了一种大通径桥塞坐封方法。本发明提供的大通径桥塞可以避免桥塞的钻磨工序,避免了钻磨所带来的施工周期长、作业成本高和施工风险大等问题,使桥塞的使用更简便、施工更快捷。
Description
技术领域
本发明涉及石油工业技术领域,特别涉及一种大通径桥塞及其坐封方法。
背景技术
在石油工业领域,通常使用封隔器或者桥塞实现封隔层间等工序,桥塞的作用是油气井封层,它具有施工工序少、卡封位置准确、压裂规模大等特点。
随着油气田的开发和能源的不断消耗,非常规油气将成为未来石油天然气能源的方向。复合桥塞多层段压裂技术是目前国内外进行页岩气藏等非常规油气开发使用的主要技术,该技术因其工具管柱简单、受限较少,该桥塞得到普遍使用。该桥塞钻铣完后能够保证井筒的畅通,能够便于后续工艺管柱下入,由于以上优点,复合桥塞已在国外分段级数多、改造规模大的低渗透油气井、页岩气井上广泛应用。
但是,在复合桥塞在后续使用时,为了保障油气的畅通,通常需要用钻磨的方法将桥塞整体钻磨去除,钻磨的过程耗时较长,钻屑循环困难,钻磨的作业成本高,因此在页岩气分段压力改造中局限性比较大。
综上所述,如何避免桥塞复杂的钻磨工序,是本领域技术人员目前需要解决的技术问题。
发明内容
有鉴于此,本发明的目的是提供一种大通径桥塞,该大通径桥塞在后续使用时不需要进行钻磨,可以显著提高桥塞的施工效率,节约油气井的作业时间。本发明的另一目的是提供一种大通径桥塞坐封方法。
为实现上述目的,本发明提供如下技术方案:
一种大通径桥塞,其中,包括上接头、中心管、引鞋头和桥塞组合件;
所述上接头为环状件,固定套接在所述中心管一端的外侧;
所述中心管为金属中心管,所述中心管靠近所述上接头的一端设置有可溶球球座,所述中心管为可钻金属件;
所述引鞋头为环状件,固定套接在所述中心管另一端的外侧,所述引鞋头上设有用于与套在桥塞中的拉杆固定连接的装置;
所述桥塞组合件套设在所述中心管中段的外侧,且位于所述上接头和所述引鞋头之间。
优选地,所述桥塞组合件包括端环、护腕、卡瓦、卡瓦座和胶筒,均套设于所述中心管的外侧;所述胶筒两端的锥形端面上各设置一个所述护腕;所述护腕为带有锥度的套筒,所述护腕的锥形端面贴合在所述胶筒的锥形端面上,所述护腕为塑性护腕;两个所述护腕锥形端面外侧分别套接一个所述端环,其中一个所述端环的另一端与所述上接头的锥形端面贴合,另一个所述端环的另一端与所述卡瓦座的锥形端面贴合,所述卡瓦座与所述中心管通过卡瓦座剪钉连接;所述卡瓦座的另一个端面与所述卡瓦的锥形端面贴合,卡瓦非锥面的一端与引鞋头一端相接触。
优选地,所述胶筒包括主胶筒和副胶筒;所述主胶筒和所述副胶筒均套设于所述中心管的外侧,所述副胶筒为锥形的套筒,所述副胶筒的锥形内侧壁贴合在所述主胶筒的下端端口外侧壁上,所述副胶筒的锥形外壁贴合在所述护腕的锥形端面上。
优选地,还包括倒齿环,所述倒齿环套设在所述上接头内壁和所述中心管外壁之间,所述上接头内壁上的内锯齿形螺纹和所述倒齿环外锯齿螺纹配合,所述倒齿环的内锯齿螺纹与所述中心管的外锯齿螺纹配合。
优选地,所述主胶筒的两个端面上均设置所述副胶筒,且所述副胶筒的个数至少为两个。
优选地,所述上接头通过上接头剪钉与所述中心管固定,所述上接头剪钉设置于所述中心管的径向上,所述上接的上端设有用于连接其他桥塞下接头的爪式结构,所述引鞋头通过丢手剪钉与所述拉杆固定。
优选地,所述上接头、所述端环、所述卡瓦座、所述卡瓦和所述引鞋头均为可钻金属件。
优选地,所述卡瓦为整体式卡瓦,其外表面上设有均匀分布的应力集中槽,所述应力集中槽的方向沿所述卡瓦的轴向设置,所述卡瓦与所述引鞋头接触的端面上设有径向的开口槽;所述卡瓦插入引鞋头一端的槽中与所述引鞋头连接。
一种大通径桥塞坐封方法,用于油气井的封堵,其中,所述方法包括:
将坐封工具的拉杆与所述引鞋头固定,将所述坐封工具中的推筒对准桥塞,其端面与所述桥塞上的所述上接头相接触,通过所述拉杆将所述引鞋头和所述中心管的位置固定,实现所述拉杆与所述桥塞的连接;
通过电缆或连续油管将所述桥塞下放到套管中的预定位置;
启动所述坐封工具,所述推筒挤压所述上接头端面,所述上接头挤压所述桥塞组合件,封隔所述桥塞与所述套管的环空,并锚定所述桥塞,断开所述拉杆与所述引鞋头的固定连接,使所述坐封工具与所述桥塞分离;
将与所述桥塞分离的所述坐封工具提出地面,投放可溶球至所述上接头一端的可溶球球座上,坐封完成;进行压裂施工,压裂施工后,所述可溶球在地层流体的作用下进行溶解。
本发明提供的一种大通径桥塞,将现有技术中复合材料中心管改为金属中心管,由于金属中心管的硬度较高、强度较高,所以中心管的厚度减小、内径变大也可以满足中心管的强度要求。所以,本发明所提供的中心管可用于将原有技术中内径较小、管壁较厚的中心管改变为内径较大、管壁较薄的金属中心管,在桥塞的使用过程中,较大的中心管内径可以满足生产需要,避免了生产前对于桥塞的钻磨;第二,相比起复合桥塞中塑胶中心管,本发明的金属中心管的结构强度更好,在坐封过程中,中心管不会因其管比较薄和塑性特性等原因发生损坏,可以顺利完成坐封,保证桥塞的正常使用。第三,若在后续使用中,需要通过钻除桥塞更进一步提高油管的传输量时,金属材质的桥塞钻除方便。
由上述技术方案可看出,本发明提供的大通径桥塞可以避免桥塞的钻磨工序,避免了钻磨所带来的施工周期长、作业成本高和施工风险大等问题,使桥塞的使用更简便、施工更快捷。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案,下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本发明的实施例,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据提供的附图获得其他的附图。
图1为本发明所提供一种大通径桥塞的具体实施例的结构示意图;
图2为本发明所提供一种大通径桥塞的具体实施例中装入可溶球后的结构示意图;
图3为本发明所提供一种大通径桥塞的具体实施例中上接头的结构示意图;
图4为本发明所提供一种大通径桥塞的具体实施例中引鞋头的结构示意图;
图5为本发明所提供一种大通径桥塞坐封方法的流程图。
其中,1为上接头,2为上接头剪钉,3为倒齿环,4为端环,5为副胶筒,6为主胶筒,7为中心管,8为护腕,9为卡瓦座,10为卡瓦座剪钉,11为卡瓦,12为引鞋头,13为丢手剪钉,14为可溶球,15为推筒,16为拉杆。
具体实施方式
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
本发明的核心是提供一种大通径桥塞,该桥塞在使用时不需要进行钻磨,可以显著提高桥塞的使用操作效率,节约油气井的操作时间。本发明的另一核心是提供一种大通径桥塞坐封方法。
请参考图1和图2,图1为本发明所提供一种大通径桥塞的具体实施例的结构示意图,图2为本发明所提供一种大通径桥塞的具体实施例中装入可溶球后的结构示意图。
在一种具体实施方式中,本发明所提供的桥塞包括上接头1、中心管7、引鞋头12和桥塞组合件。
其中,上接头1为类似套筒的环状件,其一端固定套接在中心管7一端的外侧。请参考图3,图3为本发明所提供一种大通径桥塞的具体实施例中上接头的结构示意图。上接头1的一端面用于与坐封装置中的推筒15相接触,将推筒15对于上接头1的挤压力传递给桥塞的其他部件,可以实现坐封。该上接头1与推筒15接触的端面上有用于与其他桥塞的下接头进行卡接的卡接结构,防止钻磨时下接头转动。
中心管7为一个内径较大的金属中心管,此中心管7的特点是内径和外径均较大,并且中心管的壁厚较薄,中心管7为可钻金属件。其中,中心管7靠近上接头1的一端设置有可溶球球座,通常为球面座或锥面座,用于放置可溶球。
请参考图4,图4为本发明所提供一种大通径桥塞的具体实施例中引鞋头的结构示意图。
引鞋头12为环状件,固定套接在中心管7另一端的外侧,引鞋头12与套在桥塞中的拉杆16固定连接。
可选地,上接头1与中心管7通过上接头剪钉2固定,上接头剪钉2从上接头1的外周面插入,并插入中心管7,沿径向方向将二者固定。
可选地,引鞋头12与套在桥塞中的拉杆16通过丢手剪钉13固定连接,丢手剪钉13从引鞋头12的外周面插入,并插入拉杆16,沿径向方向将引鞋头12和拉杆16相对固定。
可选地,引鞋头12为具有阶梯结构的环状件,该台阶面与中心管7相接触,用于卡接中心管7,引鞋头12管壁较薄的一侧通过螺钉或螺纹与中心管7相连接固定,引鞋头12管壁较厚的一侧通过丢手剪钉13与拉杆16相连接。可选地,上述连接方式也可以采用其他固定方式。
桥塞组合件套设在中心管7中段的外侧,且位于上接头1和引鞋头12之间。桥塞组合件主要包括胶筒、端环4、护腕8、卡瓦座9和卡瓦11,它们均套设于中心管7的外侧,并且在轴向上依次排列布置。
胶筒为套筒类部件,胶筒的两个端面均为锥面,该锥面方向朝向胶筒的外侧,简称外锥面,相应的,锥面方向朝向胶筒内侧的锥面简称为内锥面,以下均以简称描述,该胶筒套在中心杆7中部的外侧。
可选地,胶筒的内壁上具有环形凹槽,当胶筒受到轴向挤压力后,有助于胶筒向径向外侧的膨胀。
护腕8为带有锥度的套筒,且位于胶筒和端环4之间,胶筒的两端的锥形端面上各设置一个护腕8,护腕8的锥形端面贴合在胶筒的锥形端面上,护腕8的另一个锥形端面贴合在端环4的内端面上,上述护腕8为塑性护腕。
端环4为具有锥度的环形件,该端环4的一端面为内锥面,另一端面为外锥面。在两个护腕8的两侧各设置一个端环4,靠近上接头1一侧的端环4的外锥面与上接头1带内螺纹端的锥面紧密接触;另一个端环4的外锥面用于与卡瓦座9一端的内锥面贴合。
卡瓦座9为套筒类零件,其一端面具有向卡瓦座内侧的内锥面,另一端面为具有向卡瓦座外侧的坡面。卡瓦11为一端具有内锥面的环形件,该环形件的外圆柱表面设置有用于咬合套筒的锯齿面,卡瓦11的另一端面用于插入引鞋头12的一端。卡瓦座9与中心管7通过卡瓦座剪钉10连接,卡瓦座9的另一个端面与卡瓦11的锥形端面贴合。
可选地,在上述实施例所提供的桥塞组合件中包括胶筒,而胶筒的个数并不唯一,而且可以根据坐封时作用的不同将胶筒分为不同结构和形状的胶筒。
可选地,可以设置一个主胶筒6和一个副胶筒5,将副胶筒5安装在主胶筒6的下端端口上。进一步地,可以设置两个副胶筒5,分别套设在主胶筒6的两端。本实施例所提供的胶筒包括主胶筒6和两个副胶筒5;主胶筒6和副胶筒5均套设于中心管7的外侧,副胶筒5为锥形的套筒,副胶筒5的锥形内侧壁贴合在主胶筒6的端口的锥形外侧壁上,副胶筒5的锥形外壁贴合在端环4端面的内锥面上。
上述桥塞组合件结构的整体连接和排布方式如下:上接头1的一端与端环4的外锥面紧密贴合,在轴向上限制端环4的移动,端环4另一端的内锥面与护腕8的外锥面紧密接触,护腕8内锥面与副胶筒5外锥面紧密贴合,副胶筒5内锥面与主胶筒6的外锥面紧密贴合。端环4、护腕8、副胶筒5和主胶筒6,依次限制后者在轴向上的移动。在主胶筒6另一端,采用同样的方法依次连接副胶筒5、护腕8、端环4。这个端环4的外锥面与卡瓦座9内锥面接触贴合。卡瓦座9上的螺纹孔正对中心杆7的剪钉槽,卡瓦座9通过若干卡瓦座剪钉10固定在中心管7上,卡瓦座9另一端外锥面与卡瓦11的锥面紧贴配合,卡瓦11不为锥面的一端插入引鞋头12一端,并与之接触贴合。
可选地,上述桥塞中还包括倒齿环3,倒齿环3套设在上接头1内壁和中心管7外壁之间。在上接头1与中心管7相连接的位置上,相对应的设有用于连接倒齿环3的结构。
具体地,在该连接处,上接头1的内壁上设置有内锯齿形螺纹,中心管7的外壁上设置有外锯齿螺纹。在倒齿环3的外圆柱表面上设置有和上接头1的内锯齿形螺纹相配合的外锯齿螺纹,在倒齿环3的内圆柱表面上设置有和中心管7的外锯齿螺纹相配合的内锯齿螺纹。上接头1、倒齿环3和中心管7通过螺纹连接,并相对固定,防止胶筒和卡瓦11的解封。
为了保证坐封效果,倒齿环3的内外侧均设置有锯齿形螺纹,倒齿环3的内螺纹与中心管7上的外螺纹的锯齿朝向相反,倒齿环3的外螺纹与上接头1的内螺纹的锯齿朝向相反。坐封时上接头1和倒齿环3一起沿着中心管7上的锯齿向下移。胶筒和卡瓦11完成坐封时,上接头1和倒齿环3移动到位。由于,倒齿环3内螺纹与中心管7外螺纹的锯齿相互啮合,使倒齿环3无法再向上移动,回到原来的位置;同理也保证了上接头1不会再移动到原来的位置,因此,保证了胶筒不会解封。
可选地,上述三者也可以通过其他螺纹形式进行固定。
可选地,为了保证胶筒的坐封,主胶筒6的两个端面上设置有副胶筒5,且副胶筒5的个数至少为两个,分别放置在所述主胶筒6的两侧。
可选地,为了防止使用中桥塞仍需要钻除或移除,桥塞中的上接头1、端环4、卡瓦座9、卡瓦11和引鞋头12均采用金属件进行装配,金属件易于钻除,为钻除过程提供方便。
可选地,卡瓦11为整体式卡瓦,其外表面上设有均匀分布的应力集中槽,应力集中槽的方向沿卡瓦11的轴向设置,卡瓦11与引鞋头12接触的端面上设有径向的开口槽,上述应力集中槽和开口槽的设置有利于卡瓦均匀开裂。
本发明中采用金属中心管作为桥塞的中心管7,因为金属中心管的强度优于普通复合材料中心管的强度,在坐封过程中,中心管7的强度直接影响坐封效果,进一步地,由于在强度上得到保证,中心管7的壁厚就可以减小,中心管7的内外径均可以增大,中心管7内径的增大,可以使得桥塞的内径变大,在后续的使用中,较大的桥塞内径可以满足油层间的油气传输,不需要通过钻磨的方法去除桥塞,也就避免了钻磨步骤带来的困难。
本发明中大通径桥塞的中心管7强度高,可相对将中心管7的管壁变薄、内径变大,由于桥塞的内径由中心管7内径决定,所以较大内径的桥塞在操作使用中无需钻磨桥塞即可满足油气传输的需求,省去了现有技术中对桥塞钻磨的工序,避免了钻磨的复杂过程。
除了上述实施例所提供的桥塞,本发明还提供一种大通径桥塞的坐封方法,请参考图2和图5,图2为本发明所提供一种大通径桥塞的具体实施例中装入可溶球后的结构示意图;图5为本发明所提供一种大通径桥塞坐封方法的流程图。该方法包括以下步骤:
步骤s101:将坐封工具的拉杆16与引鞋头12固定,将坐封工具中的推筒15对准桥塞,其端面与桥塞上的接头1相接触,通过拉杆16将引鞋头12和中心管7的位置固定,实现拉杆16与桥塞的连接。
步骤s102:通过电缆或连续油管将桥塞下放到套管中的预定位置。
步骤s103:启动坐封工具,推筒15挤压上接头1端面,上接头1挤压桥塞组合件,封隔桥塞与套管的环空,并锚定桥塞,断开拉杆16与引鞋头12的固定连接,使坐封工具与桥塞分离。
步骤s104:将与桥塞分离的坐封工具提出地面,投放可溶球14至上接头1一端的可溶球球座上,坐封完成;进行压裂施工,压裂施工后,可溶球14在地层流体的作用下进行溶解。
具体的,根据上述桥塞的具体构造和形式,该桥塞的坐封方式的具体过程及作用如下:
将丢手剪钉13以其螺纹拧入引鞋头12,并拧入坐封工具的拉杆16上对应的孔中,将坐封工具的推筒15对准桥塞,以推筒15的端面与上接头1端面相接触,通过拉杆16将引鞋头12和中心管7的位置固定住,实现与坐封工具的连接。
将桥塞放置在预定位置的套管中,以桥塞上设置有引鞋头12的一端朝向坐封位置的内部。
坐封工具的推筒15动作时,通过丢手剪钉13将桥塞的引鞋头12和中心杆7固定;挤压上接头1端面,挤压力剪断剪钉12,推筒15继续挤压上接头1,上接头1带动倒齿环3向下运动,相继挤压端环4、护腕8、副胶筒5、主胶筒6、卡瓦座9。
主胶筒6和副胶筒5受到挤压后径向扩张,紧贴在套管内壁,封隔桥塞环空。卡瓦座9受到向下的挤压力后,剪断卡瓦座剪钉10,继而挤压卡瓦11,卡瓦11受挤压后开裂,嵌入套管中,锚定桥塞。同时,推筒15向下的挤压力传递到引鞋头12内的丢手剪钉13上。主胶筒6和卡瓦11完全坐封后,丢手剪钉13被坐封工具拉杆16拉断,实现了坐封工具与桥塞的脱离。
桥塞坐封完成后,提出坐封工具,向井内投入可溶解球14,可溶解球14坐在中心杆7上端的球座中,并开始压裂。
完成压裂后,可溶解球14会在一定时间内在压裂返排液的作用下溶解,留出了中心杆7的内径作为生产通道。
本发明中采用金属中心管作为桥塞的中心管7,由于金属材质的强度高,中心管7可以为管壁较薄、内径较大的中心管7,并依旧可以保证中心管7的强度。在坐封过程中,中心管7强度高、坐封过程简便安全,在后续的使用中,由于金属材质的中心管7的内径较大,可以满足油层间的油气传输,避免了钻磨步骤带来的困难。
以上对本发明所提供的一种大通径桥塞及其坐封方法进行了详细介绍。本文中应用了具体个例对本发明的原理及实施方式进行了阐述,以上实施例的说明只是用于帮助理解本发明的方法及其核心思想。应当指出,对于本技术领域的普通技术人员来说,在不脱离本发明原理的前提下,还可以对本发明进行若干改进和修饰,这些改进和修饰也落入本发明权利要求的保护范围内。
Claims (9)
1.一种大通径桥塞,其特征在于,包括上接头(1)、中心管(7)、引鞋头(12)和桥塞组合件;
所述上接头(1)为环状件,固定套接在所述中心管(7)一端的外侧;
所述中心管(7)为金属中心管,所述中心管(7)靠近所述上接头(1)的一端设置有可溶球球座,所述中心管(7)为可钻金属件;
所述引鞋头(12)为环状件,固定套接在所述中心管(7)另一端的外侧,所述引鞋头(12)上设有用于与套在桥塞中的拉杆(16)固定连接的装置;
所述桥塞组合件套设在所述中心管(7)中段的外侧,且位于所述上接头(1)和所述引鞋头(12)之间。
2.根据权利要求1所述的大通径桥塞,其特征在于,所述桥塞组合件包括端环(4)、护腕(8)、卡瓦(11)、卡瓦座(9)和胶筒,均套设于所述中心管(7)的外侧;所述胶筒两端的锥形端面上各设置一个所述护腕(8);所述护腕(8)为带有锥度的套筒,所述护腕(8)的锥形端面贴合在所述胶筒的锥形端面上,所述护腕(8)为塑性护腕;两个所述护腕(8)锥形端面外侧分别套接一个所述端环(4),其中一个所述端环(4)的另一端与所述上接头(1)的锥形端面贴合,另一个所述端环(4)的另一端与所述卡瓦座(9)的锥形端面贴合,所述卡瓦座(9)与所述中心管(7)通过卡瓦座剪钉(10)连接;所述卡瓦座(9)的另一个端面与所述卡瓦(11)的锥形端面贴合,卡瓦(11)非锥面的一端与引鞋头(12)一端相接触。
3.根据权利要求2所述的大通径桥塞,其特征在于,所述胶筒包括主胶筒(6)和副胶筒(5);所述主胶筒(6)和所述副胶筒(5)均套设于所述中心管(7)的外侧,所述副胶筒(5)为锥形的套筒,所述副胶筒(5)的锥形内侧壁贴合在所述主胶筒(6)的下端端口外侧壁上,所述副胶筒(5)的锥形外壁贴合在所述护腕(8)的锥形端面上。
4.根据权利要求3所述的大通径桥塞,其特征在于,还包括倒齿环(3),所述倒齿环(3)套设在所述上接头(1)内壁和所述中心管(7)外壁之间,所述上接头(1)内壁上的内锯齿形螺纹和所述倒齿环(3)外锯齿螺纹配合,所述倒齿环(3)的内锯齿螺纹与所述中心管(7)的外锯齿螺纹配合。
5.根据权利要求4所述的大通径桥塞,其特征在于,所述主胶筒(6)的两个端面上均设置所述副胶筒(5),且所述副胶筒(5)的个数至少为两个。
6.根据权利要求5所述的大通径桥塞,其特征在于,所述上接头(1)通过上接头剪钉(2)与所述中心管(7)固定,所述上接头剪钉(2)设置于所述中心管(7)的径向上,所述上接头(1)的上端设有用于连接其他桥塞下接头的爪式结构,所述引鞋头(12)通过丢手剪钉(13)与所述拉杆(16)固定。
7.根据权利要求6所述的大通径桥塞,其特征在于,所述上接头(1)、所述端环(4)、所述卡瓦座(9)、所述卡瓦(11)和所述引鞋头(12)均为可钻金属件。
8.根据权利要求7所述的大通径桥塞,其特征在于,所述卡瓦(11)为整体式卡瓦,其外表面上设有均匀分布的应力集中槽,所述应力集中槽的方向沿所述卡瓦(11)的轴向设置,所述卡瓦(11)与所述引鞋头(12)接触的端面上设有径向的开口槽;所述卡瓦(11)插入引鞋头(12)一端的槽中与所述引鞋头(12)连接。
9.一种大通径桥塞坐封方法,用于油气井的封堵,其特征在于,所述方法包括:
将坐封工具的拉杆(16)与所述引鞋头(12)固定,将所述坐封工具中的推筒(15)对准桥塞,其端面与所述桥塞上的所述上接头(1)相接触,通过所述拉杆(16)将所述引鞋头(12)和所述中心管(7)的位置固定,实现所述拉杆(16)与所述桥塞的连接;
通过电缆或连续油管将所述桥塞下放到套管中的预定位置;
启动所述坐封工具,所述推筒(15)挤压所述上接头(1)端面,所述上接头(1)挤压所述桥塞组合件,封隔所述桥塞与所述套管的环空,并锚定所述桥塞,断开所述拉杆(16)与所述引鞋头(12)的固定连接,使所述坐封工具与所述桥塞分离;
将与所述桥塞分离的所述坐封工具提出地面,投放可溶球(14)至所述上接头(1)一端的可溶球球座上,坐封完成,进行压裂施工;压裂施工后,所述可溶球(14)在地层流体的作用下进行溶解。
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CN104632126B (zh) | 2017-11-21 |
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