CN101688441A - 利用热流体注入生产资源 - Google Patents
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Abstract
一种用于处理地下区域(110)的系统,该系统包括安装在井筒(114)内的井下流体加热器(120)。处理流体管道、氧化剂管道和燃料管道(124a,124b,124c)将燃料源、氧化剂源和处理流体源(142a,142b,142c)与井下流体加热器(120)连接。井下燃料控制阀(126c)与燃料管道(124c)连通,并且被配置成响应于井筒的一部分中的压力变化来改变朝向井下流体加热器(120)的流动。
Description
相关申请的引用
本申请要求于2007年7月6日提交的美国第60/948,346号临时专利申请的优先权,在此通过援引在本文中纳入该申请的全部内容。
技术领域
本发明涉及资源生产,尤其涉及利用注入到地下区域中的热流体所进行的资源生产。
背景技术
含烃地层(hydrocarbon formation)中的流体可经由朝向目标地层(targeted formation)向下延伸进入地下的井筒来获取。在某些情况下,含烃地层中的流体可能具有足够低的粘度,从而原油可以从地层经过生产油管流向位于地面上的生产设备。某些含烃地层含有粘度较高的流体,这类流体不能自由地从地层流出并经过生产油管。有时将含烃地层中的这些高粘度流体称为“重质油藏(heavy oil deposit)”。在过去,含烃地层中的高粘度流体由于不能够被经济地开采(recover),因而一直未被开发。近年来,随着对于原油需求量的增大,商业运营已扩展到对这种重质油藏的开采。
在某些情形下,对含烃地层应用加热的处理流体(treatment fluid)(例如蒸汽和/或溶剂),可以减小含烃地层中流体的粘度,以便能够将原油和其它液体从地层中抽出。用于将蒸汽输送至含烃地层的系统的设计可能会受到多种因素的影响。
发明内容
从地下区域生产流体的系统和方法可以包括多个井下流体(downholefluid)加热器(包括蒸汽发生器),这些井下流体加热器或单独工作,或与诸如泵(例如电潜泵、螺杆泵等)的人工举升系统、气举系统以及其他装置协同工作。通过从(一个或多个)井下流体加热器向目标地下区域(例如含烃地层或含烃空穴)供给热流体,能够降低目标地层中的油和/或其它流体的粘度。
该系统被配置成,地面压力、井筒压力或供给(例如处理流体供给)压力的下降(loss)能致使位于井下流体加热器供给管线(例如处理流体管线、燃料管线和/或氧化剂管线)内的控制阀关闭,这能够降低在系统发生故障后井下持续燃烧的可能性。设置在井下(而不是在地面上)的控制阀可减小流出供给管线的流体(例如处理流体、燃料和/或氧化剂)的量。在某些情况下,控制阀可以是朝向关闭位置偏压并通过施加特定的压力来开启的被动控制阀。例如由于井套管的故障而导致的压力变化能够致使阀不必依赖来自地面的信号即可关闭。在某些情况下,可响应于多个井下压力传感器的读数(reading)通过本地(例如井下)或远程(例如地面)控制系统来操作多个以液压或电动方式操作的阀。
在一个方案中,此系统包括:井下流体加热器,其具有处理流体入口、氧化剂入口和燃料入口;以及井下控制阀,其与所述井下流体加热器的处理流体入口、氧化剂入口或燃料入口的其中之一连通,井下控制阀能够至少基于井筒中的压力而作出响应,以改变朝向入口的流动。
这种系统可以包括下述特征中的一个或多个特征。
在某些实施例中,此系统还包括设置在井下流体加热器与控制阀之间的密封件,该密封件适合于接触井筒的壁,并使井筒的位于该密封件上方的部分与井筒的位于该密封件下方的部分液体隔离(hydraulically isolate)。在某些情况下,此系统还包括:第二密封件,其关于控制阀与第一次提及的密封件相对设置,该第二密封件适合于接触井筒壁,并使井筒的位于该第二密封件上方的部分与井筒的位于该第二密封件下方的部分液体隔离;以及同位于第一次提及的密封件与第二次提及的密封件之间的空间相连通的管道,该管道适合于向第一次提及的密封件与第二次提及的密封件之间的井筒提供压力。该管道可以与适合于向井下流体加热器提供处理流体的处理流体供给源(supply)连通。
在某些实施例中,井下控制阀还包括可动构件,该可动构件可至少部分地通过朝向入口的流动与井筒中的压力之间的压力差而移动,以改变朝向入口的流动。
在某些实施例中,井下控制阀与燃料入口连通;并且该系统还包括与井下流体加热器的处理流体入口或氧化剂入口的其中之一连通的第二井下控制阀。
在某些实施例中,井下控制阀与井下流体加热器的氧化剂入口或燃料入口的其中之一连通;并且井下控制阀能够至少基于井筒中的压力而作出响应,以改变燃料与氧化剂的比例。
在某些实施例中,该井下控制阀邻近于井下流体加热器。
在某些实施例中,该控制阀是能够基于井筒中的压力下降而作出响应以停止朝向入口的流动的控制阀。
在某些实施例中,该井下流体加热器包括井下蒸汽发生器。
在一个方案中,此系统包括:安装在井筒中的井下流体加热器;处理流体管道、氧化剂管道和燃料管道,其分别将燃料源、氧化剂源和处理流体源连接至井下流体加热器;以及井下燃料控制阀,其与所述燃料管道连通,该井下燃料控制阀配置成响应于所述井筒的一部分中的压力变化而改变朝向井下流体加热器的流动。
这种系统可包括下述特征中的一个或多个特征。
在某些实施例中,此系统还可包括设置在井下流体加热器与燃料截止阀之间的密封件,该密封件封堵井筒中的轴向流动,并且井下燃料控制阀配置成响应于密封件上方的压力下降而改变朝向井下流体加热器的流动。在某些情况下,此系统还包括设置在燃料截止阀的井上方(uphole)处的第二密封件,该第二密封件封堵井筒中的轴向流动,并且处理流体管道与井筒的部分地限定在第一次提及的密封件与第二密封件之间的部分液体连接。
在某些实施例中,井下燃料截止阀包括可动构件,该可动构件可至少部分地通过井筒中的压力而移动,以改变通过燃料管道的流动。
在某些实施例中,此系统还包括第二井下控制阀,该第二井下控制阀与处理流体管道或氧化剂管道连通,并且能够对上述井筒的所述部分中的压力作出响应。
在某些实施例中,井下流体加热器包括井下蒸汽发生器。
在一个方案中,此方法包括:在井筒中的井下流体加热器处接收处理流体、氧化剂和燃料的流动;以及利用能够对井筒的环空压力(annulus pressure)作出响应的井下阀来改变处理流体、氧化剂或燃料的至少其中之一的流动。
这种方法可包括下述特征中的一个或多个特征。
在某些实施例中,改变流动包括:响应于井筒环空中的压力下降而改变流动。在某些情况下,改变流动包括停止流动。
在某些实施例中,此方法还包括对井筒的邻近井下阀的部分施加压力,并且改变流动包括:响应于邻近井下阀处的井筒中的压力下降来改变流动。
在某些实施例中,改变流动包括:改变氧化剂或燃料的至少其中之一的流动,以改变供给至井下流体加热器的氧化剂与燃料的比例。
在某些情况下,井下流体加热器包括井下蒸汽发生器。
相对于传统的基于地面的流体加热方式,基于井下流体加热器的系统和方法通过减少在热流体传输至目标地下区域的期间内的能量损耗或热损耗,能够提高重油的开采效率。在某些情况下,这样能够减少产生热流体所需的燃料消耗。
在某些情况下,井下流体加热器系统(例如蒸汽发生器系统)包括多个邻近于井下流体加热器设置的自动控制阀,这些自动控制阀用于控制流向井下流体加热器的水、燃料和氧化剂的流速(流量)。这些系统可配置成,地面、井筒或供给压力完整性的下降能致使井下安全阀关闭并且迅速中断朝向井下流体加热器的燃料、处理流体和/或氧化剂的流动,以确保井下燃烧或其它能量释放的安全。
在附图和下文的说明中将阐述本发明的一个或多个实施例的细节。从说明书、附图以及权利要求书中将显而易见本发明的其它特征、目的和优点。
附图说明
图1为用于处理地下区域的系统的实施例的示意图。
图2A和图2B分别为在诸如图1中的用于处理地下区域的系统中使用的控制阀的实施例的剖视图,并分别示出了处于开启位置和关闭位置的控制阀。
图3为用于处理地下区域的系统的实施例的示意图。
图4为用于处理地下区域的系统的方法的实施例的流程图。
在各个附图中,以相同的附图标记表示相同的构件。
具体实施方式
用于处理地下区域的系统和方法可以包括:利用井下流体加热器对井下区域应用加热的处理流体。一种井下流体加热器是产生热蒸汽、或蒸汽和热流体的井下蒸汽发生器。尽管“蒸汽”通常是指汽化的水,但井下蒸汽发生器可用来加热和/或汽化除了水之外的、或替代水的其它液体。通过从一个或多个井下流体加热器向目标地下区域(例如一个或多个含烃地层、或者所述含烃地层的一个或多个部分)供给加热的处理流体,能够降低目标地下区域中的油和/或其它流体的粘度。在某些情况下,井下流体加热器系统包括邻近井下流体加热器的自动控制阀,这些自动控制阀用于控制流向井下流体加热器的水、燃料和氧化物的流量(流速)。这些系统可配置成,地面压力完整性、井筒压力完整性或供给压力完整性的下降能致使井下安全阀关闭并且迅速断开朝向井下流体加热器的燃料、水和/或氧化剂流(流动),以确保井下燃烧或其它能量释放的安全。
参照图1,用于处理地下区域110的系统100包括设置在井筒114中的处理注入管柱(treatment injection string)112。处理注入管柱112适合于使来自地面116的流体通到地下区域110。在井筒114中还设有作为处理注入管柱112的一部分的井下流体加热器120,该井下流体加热器120可用于加热井筒114中的处理流体(在某些情况下加热至处理流体完全和/或部分汽化的温度点)。正如在此处所使用的,“井下”装置是指适合于设置在井筒中并在井筒中运行的装置。
供给管线124a、124b和124c将来自地面116的流体输送至井下流体加热器120的相应的入口121a、121b、121c。例如,在某些实施例中,供给管线124a、124b和124c为处理流体供给管线124a、氧化物供给管线124b和燃料供给管线124c。在某些实施例中,处理流体供给管线124a用于将水输送至井下流体加热器120。处理流体供给管线124a也可以用于输送替代水的其它流体、或除了水之外的其它流体(例如合成化学溶剂或其它处理流体)。在本实施例中,燃料、氧化剂和水在高压下从地面被泵送至井下流体加热器120。
供给管线124a、124b、124c分别具有井下控制阀126a、126b、126c。在某些情况下(例如,如果井中的套管系统发生故障),需要迅速断开朝向井下流体加热器120的燃料、氧化剂和/或处理流体的流动。供给管线124a、124b、124c中的深处于井中(例如邻近流体加热器)的阀能够防止供给管线124a、124b、124c中残留的燃料和/或氧化剂流到流体加热器,防止进一步的燃烧/产生热,并且能够限制(例如防止)井下供给管线124a、124b、124c中的反应物排放到井筒中。井下控制阀126a、126b、126c分别配置成在规定的情形下控制和/或切断通过供给管线124a、124b、124c的流动。尽管这里描述了三个井下控制阀126a、126b、126c,但是也可设置更少或更多的控制阀。
在井下流体加热器120与控制阀126a、126b、126c之间设有密封件122(例如封隔器(packer))。密封件122可由处理注入管柱112支承。密封件122可被选择性地致动(actuable)以便大体上密封和/或密封井筒114的壁,从而密封和/或大体上密封处于井筒114与处理注入管柱112之间的环空(环形空间),并使井筒114的位于密封件122的井上方处的一部分与井筒114的位于密封件122的井下方处的一部分液体隔离。
在本实施例中,处理控制阀126a、燃料控制阀126c和氧化剂控制阀126b设置在刚好位于封隔器122上方的输送供给管线的底部。除非在封隔器122上方的井筒环空上保持着最小压力,否则控制阀126a、126b、126c将关闭。处理注入管柱112与井筒114的壁(例如套管)之间的环空通常充满有液体(例如水或工作流体)。如下文将更详细地描述的,阀126a、126b、126c处的环空压力(例如与液体静压分量相结合的表面处环空压力)作用在控制阀126a、126b、126c上并使这些阀保持在开启位置。因此,环空压力下降会致使阀126a、126b、126c关闭。可将最小压力选择成允许较小的压力波动以防止控制阀的意外致动。
如果所需的表面压力(surface pressure)被有意或无意地消除,控制阀126a、126b、126c会自动关闭,同时切断井下的反应物和水的流动。在紧急关闭的情况下,能够有意地断开地面环空压力源以中断流向井下的反应物的流动。这一特定的实施例不需要为了关闭井下阀而设置与这些井下阀相连接的额外的通信、电源等。
此外,如果失去流体静压力,控制阀126a、126b、126c会关闭,由此中断流向井下的反应物的流动。由套管、供给管或封隔器的泄漏引起的工作流体(working fluid)从环空损失时,可导致这种情况的发生。
邻近地面116可设置井口装置117。井口装置117可与套管115联接,该套管115从地面116附近朝向地下区域110(例如正在被处理的地下区段(subterranean interval))延伸井筒114的大部分长度。地下区域110可以包括一个地层的一部分、一个地层或多个地层。在某些情况下,套管115可在地下区域110处或地下区域110的上方终止,余下的无套管井筒114穿过地下区域110(即裸井)。在其它情况下,套管115可延伸穿过该地下区域,并且可包括在安装套管115之前已形成的或者通过在井下打孔而形成的孔口119,以实现井筒114内部与地下区域之间的流体连通。可以使部分套管115或全部套管115或者不使套管115通过水泥夹套(cement jacket)或类似物贴附到相邻的地面材料。在某些情况下,密封件122或相关联的装置能够夹持井下流体加热器120并在支承井下流体加热器120的情况下操作。在其它情况下,可设置附加的定位装置或封隔装置例如衬管悬挂器(liner hanger)(未示出)来支承井下流体加热器120。在每种情况下,井下流体加热器120均将热流体输出到地下区域110中。
在所示的实施例中,井筒114为从地面116延伸至地下区域110的基本竖直的井筒。然而,在此描述的系统和方法也可以用于其它井筒结构(例如,倾斜井筒、水平井筒、分支井筒等其他结构)。
井下流体加热器120设置在密封件122下方的井筒114中。井下流体加热器120可以为适合于接收并加热处理流体的装置。在一种情况下,处理流体包括水,其可以被加热以产生蒸汽。开采流体(recovery fluid)可包括除了水之外的或替代水的其它不同的流体,并且不必将处理流体加热至100%汽化状态(例如蒸汽)或甚至形成蒸汽。井下流体加热器120包括用于接收处理流体和其它流体(例如空气、或诸如天然气的燃料、或这两者)的多个入口,并且井下流体加热器120可以具有用于将加热的处理流体输送至地下区域110的多种结构中的一种结构。井下流体加热器120可以利用诸如空气和天然气的流体通过燃烧或催化过程加热应用到地下区域110的处理流体(例如将水加热成蒸汽)。在某些情况下,地下区域110可能包括高粘度流体,例如重质油藏。井下流体加热器120可以将蒸汽或其它加热的处理流体供给至地下区域110,该处理流体可以渗入地下区域110,例如渗透穿过地下区域110中的裂缝和/或其它孔隙。将加热的处理流体应用于地下区域110旨在降低地下区域110中的流体的粘度并便于将其开采至地面116。
在本实施例中,井下流体加热器是蒸汽发生器120。供给管线124a、124b、124c将气体、水和空气输送到蒸汽发生器120。在某些实施例中,供给管线124a、124b、124c延伸穿过密封件122。在图1的实施例中,地面泵(surfacebased pump)142a将水从供给源(例如供水箱)泵送至与井口装置117和水管线124a连接的管146。类似地,从地面源142b、142c供给氧化剂和燃料。供给管线124a、124b、124c可具有各种不同的实施形式。
在某些情况下,可用于朝向地面116举升流体的井下流体举升系统(未示出)至少部分地设置在井筒114中,并且可以整合入或联接至生产管柱(未示出)、或与该生产管柱相关联。为了实现人工举升系统与井下流体加热器的结合过程,可以设置井下冷却系统来冷却人工举升系统和完井系统的其它组件。这种系统在例如公开号为2008/0083536的美国专利申请中有更详细的论述。
供给管线124a、124b、124c可以是生产管柱(未示出)的组成部分、可以被附连至生产管柱、或者可以是延伸穿过井筒环空128的单独的管线。尽管描述为设置有三个单独的、并联的流动管线,但供给管线124a、124b、124c中的一个或多个管线也可以同心地设置在其它供给管线中,并且/或者可以设置少于或多于三个的供给管线。一个用于将流体输送至井下流体加热器的示例性管系统包括限定了至少两个环形通道的多个同心的管,所述环形通道与管的内孔协同工作,以将空气、燃料和处理流体输送至井下热流体发生器。
参照图2A和图2B,其示出了处于开启位置(见图2A)和关闭位置(见图2B)的示例性控制(即截止)阀300。阀300具有限定了中心孔312的大致圆柱形的阀体310。阀体310包括具有螺纹内表面的端部,所述端部容置并接合于井上方连接件314和井下方连接件316。在阀体310内壁上的肩部322与阀体310的井下方端部之间的中心孔312中设置有可动构件318和弹性构件320(例如,弹簧、碟形垫片(Bellville washer)、气弹簧和/或其它构件-图中所示的是螺旋弹簧)。
可动构件318包括井上方部分324、井下方部分326和中央部分328,中央部分328的最大尺寸(例如直径)大于井上方部分324或井下方部分326。可动构件318的井上方部分324被容置在阀体310的从肩部322朝向井上方延伸的狭窄部分的内表面内并密封该内表面。可动构件318的井下方部分326被容置在井下方连接件316的内侧面的内表面中并且密封该内表面。可动构件318与阀体310共同限定出位于可动构件318的中央部分328的井上方侧的环形第一空穴330和位于可动构件318的中央部分328的井下方侧的环形第二空穴332。
延伸穿过可动构件318的孔口334提供可动构件318的内孔336与第二空穴332之间的液体连接。延伸穿过阀体310的孔口338提供第一空穴330与该阀体外部的区域(例如在其内设置阀300的井筒)之间的液体连接(hydraulic connection)。
当阀300处于其开启位置时,延伸穿过可动构件318的井上方部分324的孔口335提供可动构件318的内孔336与阀体的内孔312之间的液体连接。在使用时,这种液体连接允许流体流过阀300。当阀处于其关闭位置时,孔口335与阀体的壁部分对齐,并且穿过孔口335的流动基本上被封堵。多个密封构件340(例如O形环)被容置在可动构件318的外表面中的凹槽内,以密封地接合阀体310的内表面。阀300的关闭基本上限制了穿过阀300的朝向井上方的流动和朝向井下方的流动。例如,阀300响应于套管破裂而进行关闭能够限制(例如防止)井下方供给管线124a、124b、124c中的反应物排出到井筒中。在另一示例中,阀300的关闭能够限制(例如防止)井筒压力,以便防止当环空压力不存在时流体沿供给管线向上流动。
第一空穴330中的井筒环空压力的轴向净压力沿朝向井下方的方向(即朝向开启位置)偏压可动构件318,第二空穴中的内孔中的净压力沿朝向井上方的方向(即朝向关闭位置)偏压可动构件318。弹性构件320沿朝向井上方的方向(即朝向关闭位置)偏压可动构件318。对井筒环空压力作用于可动构件318上的第一空穴330中的区域、内孔压力作用于可动构件318上的第二空穴332中的区域、以及由弹性构件320施加在可动构件318上的力加以选择,以便在井筒环空压力与内孔压力之间具有特定压力差的情况下沿朝向井下方的方向(即朝向开启位置)偏压可动构件318。在某些情况下,可基于井系统和井下流体加热器120的正常操作条件选择特定的压力差,使得如果井筒环空压力下降到正常操作条件以下(即井筒压力下降)则通常关闭控制阀300。
参照图3,地下区域处理系统的另一示例性实施例包括邻近井下流体加热器的多个自动控制阀,所述自动控制阀响应于供水压力的下降而关闭。期望的是,当反应物(燃料和氧化剂)流向流体加热器时,使水流向井下流体加热器/蒸汽发生器120。即使是发生短暂时间的燃烧,但如果水流已被中断,则会由于过热而导致流体加热器、套管或其它井下组件的严重受损或完全失效。
虽然本实施例大体上与上述参照图1所论述的实施例相似,但是本实施例包括密封件122和上部密封件122′。地面泵或其它压力供给装置142a通过供给管线124a、控制阀126a将处理流体供给至流体加热器120(例如蒸汽发生器)。从供给管线124a分出的分支被导引穿过上部封隔器或密封装置122′进入密封件122与上部密封件122′之间的上部环空145中。在示出的实施例中,密封装置122′为封隔器。在某些情况下,上部密封装置122′可以是作为油管悬挂器(tubing hanger)的一部分的密封装置,所述油管悬挂器在井口装置凸缘处被固定及封闭。通过设置密封件122与密封件122′之间的密封间隔,井筒中的环空压力无需仅为环空145中的流体的静压力,而是还可以包括由压力供给装置142a供给的流体的压力。如果由于地面泵或压力供给装置142a出于某种原因无法提供足够的压力而使上部环空145中的压力下降到临界值(例如一特定的压力)以下,则控制阀126a、126b、126c会自动关闭。本实施例能够降低当供给管线124a中没有足够的处理流体存在时反应物被引入流体加热器中的可能性。
参照图4,在操作中,井筒114钻入地下区域110,并且井筒114可视情况加套管或进行完井操作。在井筒114进行完井操作之后,处理注入管柱112、井下流体加热器120和密封件122可被安装在井筒114中,该井筒114具有处理流体管道124a、氧化剂管道124b和燃料管道124c,其将处理流体源142a、氧化剂源142b和燃料源142c与井下流体加热器120连接(步骤200)。随后,密封件122被致动而径向延伸为压靠并密封或基本上密封套管115,以便将井筒114的包含井下流体加热器120的部分隔离。通过对井筒的处于密封件122上方的部分内的工作流体施加压力来保持处理流体管道124a、氧化剂管道124b和燃料管道124c上的控制阀126a、126b、126c开启(步骤210)。在某些情况下,该压力以工作流体的流体静压力的形式被施加。在某些情况下,第二密封件122′被致动而径向延伸为压靠并密封和/或基本上密封套管115,并将井筒114的在密封件122与密封件122′之间的部分隔离。从处理流体管道124a分出的分支与井筒114在第一封隔器122与第二封隔器122′之间的部分液体连接,用以在密封件122之上施加压力。
可启动井下流体加热器120,同时接收处理流体、氧化剂和燃料,以便燃烧氧化剂和燃料并由此加热井筒中的处理流体(例如蒸汽)(步骤220)。热流体可通过增高已存在于目标地下区域110中的流体的温度和/或通过用作溶剂来降低这种流体的粘度。在粘度充分降低之后,通过生产管柱(未示出)从地下区域110向地面116生产流体(例如石油)。在某些情况下,例如由于系统故障而使得地面、井筒或供给压力完整性下降,或井筒压力发生变化而改变了处理流体、氧化剂和/或燃料的流动(例如改变了氧化剂和燃料的比例)。地面压力完整性、井筒压力完整性或供给压力完整性下降使得井下安全阀关闭并且迅速断开朝向井下流体加热器的燃料、处理流体和/或氧化剂的流动,以确保井下燃烧或其它能量释放的安全。
以上描述了本发明的多个实施例。然而,应理解的是,在不脱离本发明的精神和保护范围的情况下可以作出多种变型。
例如,本发明的系统可以实施有可变化流量的处理流体控制阀、可变化的氧化物燃料控制阀和/或可变化流量的燃料控制阀作为供给控制阀126a、126b、126c。可变化流量的控制阀是配置成响应于井筒环空中特定的压力条件而改变经过其内孔的节流量的阀。例如,可变化流量的控制阀可对井筒环空中的压力上升和回落或下降和回升的循环、对阀的内孔与井筒环空之间的特定压力差、和/或对其它的特定压力条件作出响应。在某些示例中,可变化流量的控制阀可具有完全开启位置(内部节流程度最小)、完全关闭位置(使流动停止或基本上停止)以及一个或多个节流程度不同的中间位置,从而能够响应于特定的压力条件而进行循环。
在某些情况下,上述可变化流量的控制阀被远程调节为响应于井筒环空中特定的压力条件而改变反应物(燃料和氧化剂)的混合物。例如,可利用井筒环空压力循环、阀内孔与井筒环空压力之间的压力差、以及/或其它特定的压力条件来调节可变化流量的控制阀,从而远程调节燃料入口和/或氧化剂入口的节流程度。在利用井筒环空压力循环的实施例中,每当以特定的方式(例如通过将井筒环空压力瞬间升高或降低至特定的压力)循环时,调节可变化流量的控制阀以改变燃料与氧化剂的比例。在最后的环空压力循环结束之后,该比例将保持在特殊的设定值。设于阀内部的棘轮机构(ratchet)致使对于每个棘轮机构位置的燃料与氧化剂的比例(燃料/氧化剂)以递增的方式变化,并且最终的棘轮机构位置允许该比例返回至初始比例。例如,初始比例可对应于最小的燃料/氧化剂比例,井筒环空压力循环致使阀以递增的方式改变棘轮机构位置并以一个或多个增量来增大燃料/氧化剂比例,并且最终的棘轮机构位置使得该比例从最大燃料/氧化剂比例返回至最小燃料/氧化剂比例。接着,环空压力循环的应用将以递增的方式改变燃料/氧化剂比例直至再次到达最大比例,随后回复到最小比例。以此方式,可以将该比例重复地设定为任何期望的程度。在美国第4,429,748号专利中描述了上述的棘轮机构技术。通过设置可变化流量的燃料控制阀作为阀126c,以及/或设置可变化流量的氧化剂控制阀作为阀126b,能够实现对燃料/氧化剂比例的调节。类似的对处理流体的控制可通过设置可变化流量的处理流体控制阀作为阀126a来实现。
在某些实施例中,燃料、氧化剂和处理流体供给管线可以同时具有截止控制阀和可变化流量的控制阀,或者将可变化流量的位置和截止位置以及控制的功能结合在同一个阀中。利用上文所述及附图所示的多个示例性实施例的特征的结合,主阀和辅阀的操作确保了在多种多样可能的井下及地面条件下的井下燃烧和蒸汽发生器的安全和有效的操作。
相应地,其它多个实施例也包涵在所附权利要求书的范围内。
Claims (22)
1.一种用于安装在井筒中的系统,包括:
井下流体加热器,其具有处理流体入口、氧化剂入口和燃料入口;以及
井下控制阀,其与所述井下流体加热器的处理流体入口、氧化剂入口或燃料入口连通,
所述井下控制阀能至少基于所述井筒中的压力而作出响应,以改变朝向所述入口的流动。
2.如权利要求1所述的系统,还包括设置在所述井下流体加热器与所述井下控制阀之间的密封件,所述密封件适合于接触所述井筒的壁并使所述井筒位于所述密封件上方的部分与所述井筒位于所述密封件下方的部分液体隔离。
3.如权利要求2所述的系统,还包括:
第二密封件,其关于所述井下控制阀与第一次提及的密封件相对设置,所述第二密封件适合于接触所述井筒的壁并使所述井筒位于所述第二密封件上方的部分与所述井筒位于所述第二密封件下方的部分液体隔离;以及
管道,其和位于第一次提及的密封件与所述第二密封件之间的空间连通,并适合于向位于第一次提及的密封件与所述第二密封件之间的井筒提供压力。
4.如权利要求3所述的系统,其中所述管道与适合于向所述井下流体加热器提供处理流体的处理流体供给源连通。
5.如前述权利要求中任一项所述的系统,其中所述井下控制阀还包括可动构件,所述可动构件能够至少部分地通过朝向所述入口的流动与所述井筒中的压力之间的压力差而移动,以改变朝向所述入口的流动。
6.如前述权利要求中任一项所述的系统,其中所述井下控制阀与所述燃料入口连通;并且
所述系统还包括与所述井下流体加热器的处理流体入口或氧化剂入口连通的第二井下控制阀。
7.如权利要求1所述的系统,其中所述井下控制阀与所述井下流体加热器的氧化剂入口或燃料入口连通;并且所述井下控制阀能至少基于所述井筒中的压力而作出响应,以改变燃料与氧化剂的比例。
8.如前述权利要求中任一项所述的系统,其中所述井下控制阀邻近所述井下流体加热器。
9.如前述权利要求中任一项所述的系统,其中所述控制阀是基于所述井筒中的压力下降而作出响应以停止朝向所述入口的流动的控制阀。
10.如前述权利要求中任一项所述的系统,其中所述井下流体加热器包括井下蒸汽发生器。
11.一种用于处理地下区域的系统,包括:
安装在井筒中的井下流体加热器;
处理流体管道、氧化剂管道和燃料管道,其分别将处理流体源、氧化剂源和燃料源连接至所述井下流体加热器;以及
井下燃料控制阀,其与所述燃料管道连通,所述井下燃料控制阀配置成响应于所述井筒的一部分中的压力变化而改变朝向所述井下流体加热器的流动。
12.如权利要求11所述的系统,还包括设置在所述井下流体加热器与燃料截止阀之间的密封件,所述密封件封堵所述井筒中的轴向流动,并且所述井下燃料控制阀配置成响应于所述密封件上方的压力下降而改变朝向所述井下流体加热器的流动。
13.如权利要求12所述的系统,还包括设置在所述燃料截止阀的井上方处的第二密封件,所述第二密封件封堵所述井筒中的轴向流动,并且所述处理流体管道与所述井筒的部分地限定在第一次提及的密封件与所述第二密封件之间的部分液体连接。
14.如权利要求11所述的系统,其中所述井下燃料截止阀包括可动构件,所述可动构件能至少部分地通过所述井筒中的压力而移动,以改变通过所述燃料管道的流动。
15.如权利要求11-14中任一项所述的系统,还包括第二井下控制阀,所述第二井下控制阀与所述处理流体管道或氧化剂管道连通,并且能对所述井筒的该部分中的压力作出响应。
16.如权利要求11-15中任一项所述的系统,其中所述井下流体加热器包括井下蒸汽发生器。
17.一种处理地下区域的方法,包括:
在井筒中的井下流体加热器处接收处理流体流、氧化剂流和燃料流;以及
利用能对井筒环空压力作出响应的井下阀来改变处理流体、氧化剂或燃料至少其中之一的流动。
18.如权利要求17所述的方法,其中改变处理流体、氧化剂或燃料至少其中之一的流动包括:响应于所述井筒环空中的压力下降来改变流动。
19.如权利要求18所述的方法,其中改变处理流体、氧化剂或燃料至少其中之一的流动包括:停止流动。
20.如权利要求17所述的方法,还包括对所述井筒邻近所述井下阀的部分施加压力,并且改变处理流体、氧化剂或燃料至少其中之一的流动包括:响应于邻近所述井下阀处的井筒中的压力下降来改变流动。
21.如权利要求17所述的方法,其中改变处理流体、氧化剂或燃料至少其中之一的流动包括:改变氧化剂或燃料至少其中之一的流动,以改变供给至所述井下流体加热器的氧化剂与燃料的比例。
22.如权利要求18-21中任一项所述的方法,其中所述井下流体加热器包括井下蒸汽发生器。
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CN114041004A (zh) * | 2019-04-26 | 2022-02-11 | 通用能源回收公司 | 减轻高温流体注入期间对井部件热损害的装置、方法和井筒设施 |
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