CN100377828C - 连接可膨胀管的方法 - Google Patents
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- Y10T29/49908—Joining by deforming
- Y10T29/49938—Radially expanding part in cavity, aperture, or hollow body
- Y10T29/4994—Radially expanding internal tube
Abstract
本发明提供一种连接可膨胀管和扩展被连接的该管的方法,该方法包括:通过锻焊对所述管进行连接,同时,在锻焊操作的至少一部分中,使还原冲洗气体环绕冲洗被加热的所述管端部,以便从被锻焊的所述管端部去除氧化物、并限制所述管端部之间的不规则部的量,并且径向地扩展被连接的所述管。
Description
技术领域
本发明涉及一种连接可膨胀管的方法。
背景技术
可膨胀管越发应用于石油与天然气的开采井,可包括因扩展而变宽的槽或其他穿孔,或可具有被由例如扩展锥和/或一组辊子等扩展装置周向拉伸的连续的“无槽”管壁。
由于焊接会在焊接区域引起至少一些管壁的强化和/或弱化,强化会妨碍甚至中断扩展工序,反之弱化会导致管体容易在焊接区域塌陷、弯曲和/或爆裂,所以可膨胀管通常通过机械式连接器进行连接。
另外,在要求焊接带槽衬管时,存在一些需要克服的特殊问题。第一种情况,带槽可膨胀管不易被完全密封地进行非氧化气体或还原气体或气体混合物的冲洗和空气的移除。第二种情况,直接焊接带槽可膨胀管的端部还会导致管端部的槽也被一并焊死。这样,不但阻碍了扩展,还限制了带槽可膨胀管的固有功能。
国际专利申请WO 98/33619公知了由无定形结合方法连接可膨胀管的方法,还有国际专利申请WO 0230611公知了通过激光焊接连接可膨胀管的方法。但是,这些连接技术消耗时间,并且需要对管端部之间进行非常精确的定位以及将管端部加工成极其精确的平面形状,所以这些技术不能实际应用于例如钻井装置、海上油田平台或管道铺设船只。
发明内容
本发明的目的在于提供一种通过相对快速且简单的焊接操作连接可膨胀管的方法,与现有焊接技术相比能够更容易实施于钻井装置、海上油田平台或管道铺设船只,由该方法可得到高质量焊接,从而将在焊接区域的管壁强度的变化降低至最小程度。
本发明的技术方案如下:
一种连接可膨胀管和扩展被连接的管的方法,每根管具有带槽的中间部分和被折叠的无槽的端部部分,该方法包括:通过锻焊使所述管在相应的无槽的端部部分处连接,同时,在锻焊操作的至少一部分中,使还原冲洗气体环绕冲洗被加热的管端部,以便,从被锻焊的管端部去除氧化物;径向地扩展被连接的所述管,从而使无槽的端部部分在扩展过程中被展开。
本发明的方法包括:连接所述管,和径向地扩展被连接的所述管。其中,通过锻焊对所述管进行连接,同时,在锻焊操作的至少一部分中,使还原冲洗气体环绕冲洗被加热的所述管端部,以便从被锻焊的所述管端部去除氧化物;所述冲洗气体为由基本为惰性的气体和还原气体组成的非爆炸性混合物;所述管端部是通过使高频电流在圆周方向流过将要被连接的所述管端部附近的管壁而被加热的。
所述管可包括在或靠近被锻焊的端部的槽和/或其他穿孔,在锻焊工序中,用耐热填料填充该槽和/或其他穿孔。
可选地,通过使高频电流在圆周方向流过将要被连接的所述管端部附近的管壁而加热所述管端部,并且所述耐热填料包括导电陶瓷材料。另外,最好提供一围绕焊接区域的气封,以使非氧化气体或还原气体或气体混合物冲洗于延长的内部和外部密封区域。
在锻焊操作前,要进行连接的管端部可一起扩展并折叠为大致相似的凹陷形或褶皱形,此后,凹陷形或褶皱形的管端部被锻焊在一起,并在随后的管扩展工序中被展开为大致圆柱形。这种情况下,所述管在焊接端部区域可具有无槽的、基本连续的管壁,并可包括离开焊接端部的一系列交错的槽和/或其他穿孔,这样,在扩展管时,被焊接的、最初为凹陷形或褶皱形的管端部展开为大致圆柱形,并且所述槽和/或其他穿孔也变宽。
所述管可通过锻焊进行例如向下进井地连接,其中,加热管端部到锻焊温度,并且在锻焊操作的至少一部分中,在使还原冲洗气体环绕冲洗被加热的管端部时,将其压在一起。在这种情况下,管端部可至少部分地相互重叠搭接,并且将锻焊装置插入内管,该锻焊装置加热所述管端部,使还原冲洗气体冲洗在重叠搭接的所述管端部之间留下的任何间隙,并随后将所述内管的被加热的端部的外表面压到外管的内表面,以通过锻焊连接所述管端部。
可选地,所述管端部为齿形或具有互补的正弦曲线形,以缓和在扩展和/或展开工序中对被锻焊的管端部施加的力。
优选冲洗气体为由基本为惰性的气体与还原气体组成的非爆炸性混合物,该混合物包含有体积为90%以上的如氮、氦或氩等的基本为惰性的气体、和体积为2%以上的氢。
可使用多种加热技术来使管端部达到足够的热度,以便能进行冶金接合。所述加热技术可包括电加热、电磁加热、感应加热、红外线加热、电弧加热和/或摩擦加热,或者这些加热方法的组合和/或其他加热方法。
当应用于本发明时,终端锻焊技术包括圆周加热管端部和随后冶金接合被加热的管端部的所有技术,其中包括有一般人们所周知焊接技术,如熔接、摩擦焊接、电弧焊接和/或对接焊。
从授予Per H.Moe的美国专利4566625、4736084、4669650和5721413号可知,下面的做法可能是有益的,即在锻焊操作之前或操作中使用还原冲洗气体如氢气或一氧化碳冲洗管端部,从而可从被加热的管端部除去所有氧气表面,并且可获得具有最小限度不规则性的冶金连接。从美国专利2719207和4728760号可知,使用非爆炸性混合物来进行电弧焊接和感应对接焊,该非爆炸性混合物含有体积约为95%的基本为如氩、氮和/或氦等惰性气体的部分,和体积约为5%的还原气体如氢气和/或一氧化碳。
附图说明
图1示出了安装后的直径部分的带槽管的部分纵向剖面图和部分侧视图;
图2示出了在管端部被折叠为褶皱形后的图1所示的管的横断面视图;
图3为图2所示管的侧视图,示出了从带槽的中间部分向随后将被锻焊到相邻褶皱形管端部的褶皱形端部的转变;
图4为一些步骤的示意图,在一种技术的实施例中需要这些步骤,以确保向形成于不同的可膨胀管的槽或穿孔填充耐火材料,以使所述槽或穿孔不被焊接到一起地对管端部进行锻焊;
图5示出了一用于锻焊带槽或带穿孔可膨胀管的密封部件,其中内部和外部的密封区域被显著延展,超过用于无槽或无穿孔管时;
图6示出了一对具有锻焊连接的、互相啮合的齿形端部的可膨胀管;
图7示出了一对具有锻焊连接的、在圆周方向上互相啮合的正弦曲线形端部的可膨胀管;
图8示出了一对具有锻焊连接的、重叠的正弦曲线形端部的可膨胀管。
具体实施方式
下面参照附图对本发明的优选实施方式进行详细地说明。
如图1到图8所示,带槽可膨胀管可被应用于油井和气井以控制例如出砂等。
为此目的,所述管可由具有特定网格尺寸的筛网组件进行包裹,以防止生产时砂进入孔内。
由筛网对其周围进行包裹的所述管,以数个长度通常为10m的管段形式送到井位置。美国专利5924745公开了通过带槽螺纹接头对可膨胀管部分的重叠搭接端部进行连接。
在钻机上组装管时,将螺纹接头的两部分上的槽对准并锁紧。当所述管到达孔的目标深度时,通过贯通管地推进一锥,使管扩展,以确保可膨胀管外壁与地层或套管内壁之间的紧密接触。
美国专利5924745号所公知的带槽接头通过以下方式设计,所述锥所需的扩展接头的扩展力类似于带槽管的扩展力本身。这是必要的,因为它可以没有使未扩展管段在锥下面变形的危险地、使锥被推下孔中。
但是,所公知的带槽接头是价格昂贵的管元件,并且当放管到孔中时、组装所述接头操作为一关键操作。
本发明的锻焊方法的目的在于用一种焊接连接取代美国专利5924745号所公知的螺纹连接,以克服螺纹连接的缺点。
本发明的方法可用于锻焊图1所示部分带槽的管1的端部到(未图示的)相邻部分带槽的可膨胀管的端部。
未扩展的管1具有一比经在孔中扩展后的(未图示的)扩展的管直径小至少10%的直径D2。按照应用于钻机现场的焊接工序的要求,加工所述管的端面2。管3的中间部分具有槽4,在管的两端都留下管的实壁部分5。
图2示出了实壁且无槽的端部部分5,将其折叠为该部分的外径等同于放入孔中时的未扩展的管的直径D1的形式。
此后,通过压缩在管体上加工的槽使中间部分3也缩小成同样的直径D1,如图3所示。这意味着中间部分保持圆柱形。最后,所述管3备有一未图示的可扩展的砂筛装置。
当在至少锻焊操作的一部分中,使还原冲洗气体围绕被加热的管端部冲洗时,在钻机上通过锻焊将两管段的褶皱形端部部分5焊接在一起。当锻焊连接的未扩展的管构成的管柱到达目的深度时,推进一锥,使其从顶到底或反之地贯通所述管。由此,扩展带槽管身到一扩大的直径D2,并且展开被锻焊在一起的连接处褶皱形部分,使其再次达到与扩展了的带槽管部分的直径D2近似的最初直径。
锻焊连接的优点在于:
-由于通过对准接头的褶皱形端部部分而容易进行管接头的对位,从而彻底地简单化了钻机现场中的管接头的操作;
-连接处端部部分不带槽,容易进行加热处理;具有一用于通过电流的连续路径;
-由于端部部分是唯一的被展开的,所以成形带槽管的实壁端部部分所需的对锥施加的力远小于扩展所述部分的力;不要求增加管的圆周长度;
-在放入孔中时和安装后,管之间存在一较大的直径比率,因为该比率不被实壁管的最大扩展率所限制;
-该直径比率不受带槽管的圆周百分比所控制。
可选的焊接的带槽管的工序与实施例,包括一管,该管具有等于放入管到孔中时所需直径的最初直径。该实壁管的两端部部分在安装到井中后被扩展到管的直径。两扩展端部部分的一部分和中间部分具有槽。然后,折叠扩展端部部分(实壁带槽部分)以使其再次缩小直径到管的带槽部分直径的大小。
此后的工序与上述工序一样。该工序的局限性为,所能达到的扩展前后之间的最大直径比率被实壁管的最大扩展率限制。
为了防止在锻焊工序中作为在各种可膨胀管的必要元件的槽或穿孔焊接在一起,向所述槽或穿孔中填充不会干扰焊接和扩展加工的不可焊接材料是必要的。
图4说明了向槽或钻孔填充陶瓷稀浆所需的步骤,所述陶瓷稀浆在所述槽或穿孔的内部硬化。操作的第一步,指出备用于开槽或穿孔的实壁管6。然后,切割槽或穿孔7。在一些变型技术中,在平板材中切出槽和/或穿孔,此之后将平板材加工成管。这两种可选择的方法都可以用于制造带槽/带穿孔可膨胀管。在锻焊中,往往优选将与管对接端的暴露面交叉的槽的宽度增大到距对接端约1-2mm的距离。完成上述槽或穿孔7后,围绕管端部设置一(未图示的)密封件,并且该区域被陶瓷稀浆8淹没。施加振动以确保所述稀浆完全填充槽或穿孔7。必要的是,使密封件包围管6的区域,该区域从管末端延伸到覆盖至少两列槽或穿孔的区域。一般地,这需要接近100mm的覆盖深度。最后,除去多余的陶瓷,使槽或穿孔7被陶瓷填料9完全填充。
焊接对接的管端部时,通常优选用还原气体或非氧化气体或气体混合物冲洗焊接区域。为能在带槽或带穿孔可膨胀管上完成该操作,必须确保含有槽的区域被完全密封。
图5说明了完成上述操作的一种简单方法。在上管10和下管16中设置密封装置12。该密封装置12包括具有足够长度以完全覆盖至少两列槽或穿孔11的密封元件13。该构形可确保位于管10、16端部的内部区域被密封以允许气体进行冲洗。除内部密封外,也需要一外部密封室。该密封室具有完全覆盖至少两列槽或穿孔11的延长的密封元件14。
如上所述,虽然优选实施例要求完全覆盖至少两列上述槽或穿孔11,但是也允许在槽或钻孔不重叠处仅覆盖一单列,尽管这会导致泄漏的危险。
图6示出了两个具有互补齿形端面53的可膨胀管51、52。在加热并锻焊连接端面53之前,可使用齿形端面53在角度方向对管51、52进行对位。然后,如箭头54所示,径向扩展连接在一起的管51、52。
图7示出了具有在这种情况下正弦曲线形在圆周方向上相对于管64、65的纵轴67旋转对称的、互补的非平面端面66的两个可膨胀管64、65。
沿非平面端面66的轮廓长度将管端部64、65焊接在一起,由此得到大于管的总圆周长度的焊接总长度,从而在如箭头68所示径向扩展管时、减少了相对于管身负荷的焊缝负荷。
图8示出了部分重叠搭接的两个可膨胀管77、78。两管77、78都具有与其他的管78、77相接触的非平面正弦曲线形端面79、80。由将管77、78的重叠搭接部分81锻焊到一起而得到大于管圆周长度的焊接长度,而且由此减少了相对于管身负荷的焊缝负荷。另外,该构形产生了负荷从一管77到另一管78的逐渐的转移,并且在如箭头82所示径向扩展管77、78时起到缓解管77、78重叠区域的应力集中的作用。
Claims (11)
1.一种连接可膨胀管和扩展被连接的管的方法,每根管具有带槽的中间部分和被折叠的无槽的端部部分,该方法包括:
通过锻焊使所述管在相应的无槽的端部部分处连接,同时,在锻焊操作的至少一部分中,使还原冲洗气体环绕冲洗被加热的管端部,以便,从被锻焊的管端部去除氧化物;
径向地扩展被连接的所述管,从而使无槽的端部部分在扩展过程中被展开。
2.如权利要求1所述的方法,其特征在于,所述管具有靠近被锻焊的管端部的槽和/或其他穿孔,在所述焊接工序中,向该槽和/或其他穿孔中填充耐热填料。
3.如权利要求2所述的方法,其特征在于,通过使高频电流在圆周方向流过将要被连接的所述管端部附近的管壁而加热所述管端部,并且所述耐热填料包括导电陶瓷材料。
4.如权利要求2所述的方法,其特征在于,与暴露的所述管端部交叉的所述槽和/或穿孔,在所述管端部具有增加的宽度,以防止在锻焊连接所述管端部时所述槽和/或穿孔的侧壁被锻焊到一起。
5.如权利要求1所述的方法,其特征在于,在锻焊操作之前,将所述管端部都扩展和折叠为大致相似的凹陷形或褶皱形,此后,所述凹陷形或褶皱形管端部被锻焊到一起,并在随后的管扩展工序中被展开为大致圆筒形。
6.如权利要求5所述的方法,其特征在于,所述管在焊接端部区域具有无槽且基本连续的管壁,并且具有离开焊接端部的一系列交错的槽和/或其他穿孔,以致,在扩展所述管时最初为凹陷形或褶皱形的、被焊接的所述端部展开为大致圆筒形,并且所述槽和/或其他穿孔变宽。
7.如权利要求1所述的方法,其特征在于,一对至少部分重叠搭接的管的端部,通过加热该重叠搭接的管端部到锻焊温度而对其进行锻焊而连接,并且在锻焊操作的至少一部分中,当使还原冲洗气体环绕冲洗被加热的所述管端部时,将被加热的、部分重叠搭接的所述管端部压到一起。
8.如权利要求7所述的方法,其特征在于,将锻焊装置插入内管,该锻焊装置加热所述管端部,使还原冲洗气体冲洗位于重叠搭接的所述管端部之间留下的任何间隙,并随后将所述内管的被加热的端部的外表面压到外管的内表面,以通过锻焊连接所述管端部。
9.如上述权利要求中的任一项所述的方法,其特征在于,所述管端部为齿形或具有正弦曲线形,以缓和在扩展和/或展开工序中对所述锻焊端部施加的力。
10.如权利要求1所述的方法,其特征在于,所述冲洗气体包含:体积为90%以上的基本为惰性的气体和体积为2%以上的氢。
11.如权利要求10所述的方法,其特征在于,所述基本为惰性的气体是从氮、氦或氩中选出的。
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-
2003
- 2003-07-17 AT AT03763884T patent/ATE387980T1/de not_active IP Right Cessation
- 2003-07-17 DE DE60319545T patent/DE60319545T2/de not_active Expired - Fee Related
- 2003-07-17 US US10/621,631 patent/US7181821B2/en not_active Expired - Fee Related
- 2003-07-17 EP EP03763884A patent/EP1531959B1/en not_active Expired - Lifetime
- 2003-07-17 AU AU2003254369A patent/AU2003254369B9/en not_active Ceased
- 2003-07-17 CN CNB038169398A patent/CN100377828C/zh not_active Expired - Fee Related
- 2003-07-17 EA EA200500220A patent/EA006464B1/ru not_active IP Right Cessation
- 2003-07-17 DK DK03763884T patent/DK1531959T3/da active
- 2003-07-17 CA CA002492476A patent/CA2492476A1/en not_active Abandoned
- 2003-07-17 WO PCT/EP2003/007781 patent/WO2004007134A1/en active IP Right Grant
- 2003-07-17 UA UAA200501483A patent/UA81771C2/uk unknown
-
2005
- 2005-02-16 NO NO20050821A patent/NO20050821L/no not_active Application Discontinuation
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Also Published As
Publication number | Publication date |
---|---|
AU2003254369B2 (en) | 2006-07-27 |
EP1531959B1 (en) | 2008-03-05 |
AU2003254369B9 (en) | 2006-12-07 |
US7181821B2 (en) | 2007-02-27 |
WO2004007134A1 (en) | 2004-01-22 |
US20050050726A1 (en) | 2005-03-10 |
EP1531959A1 (en) | 2005-05-25 |
EA006464B1 (ru) | 2005-12-29 |
UA81771C2 (uk) | 2008-02-11 |
CA2492476A1 (en) | 2004-01-22 |
NO20050821L (no) | 2005-04-12 |
DE60319545T2 (de) | 2009-04-02 |
DE60319545D1 (de) | 2008-04-17 |
AU2003254369A1 (en) | 2004-02-02 |
ATE387980T1 (de) | 2008-03-15 |
CN1668410A (zh) | 2005-09-14 |
EA200500220A1 (ru) | 2005-06-30 |
DK1531959T3 (da) | 2008-06-16 |
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