CN107532468B - 用于压缩和调节烃气的系统和方法 - Google Patents
用于压缩和调节烃气的系统和方法 Download PDFInfo
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Abstract
本发明涉及一种用于捕获和处理火炬气的系统和方法,使得该气体可用作压缩天然气(“CNG”)。火炬气由升压压缩机和CNG压缩机的组合来加压。当在级间和在升压压缩机与CNG压缩机之间时,气体被处理以移除湿气并且以分离出较高分子量烃。通过在脱水单元内使级间气体与吸湿剂接触来移除湿气。无湿气的烃流体膨胀并且/或者被外部冷却并且被导引至排出鼓。较高分子量烃在排出鼓中被从流体中分离出。来自排出鼓的气体在CNG压缩机中被压缩。
Description
技术领域
本公开大体涉及一种用于压缩来自烃生产井的气体的系统和方法,在此气体在多个级中被压缩并且在级之间被调节。
背景技术
产自地层(subterranean formations)的烃通常是气体和液体的多相流体混合物。来自这些多相混合物的液体通常被收集和运输至处理设备用于进一步精炼。然而,由于存储或输送所生产的气体不总是经济的,它们有时被直接运送至火炬而不是被捕获。当气体被捕获时其通常被处理以移除湿气和其他不想要的化合物。水合物抑制剂、诸如甲醇偶尔被用于防止在气体中形成水合物。然而,当试图获得可销售的气体产品时,水合物抑制剂可能难以从气体中分离并且因此带来额外的复杂性。
发明内容
本文中说明了一种生产压缩天然气的示例方法,其包括从井眼(wellbore)获得流体;在此流体包括液体和气体,并且还包括较高分子量烃和较低分子量烃的混合物。来自井眼的气体被加压至级间压力,并且当气体处于级间压力时湿气被从气体中移除以形成干燥气体。当气体处于级间压力时较高分子量烃被从气体移除以离析天然气;并且被处理的天然气被加压以形成压缩天然气。从气体中移除湿气可包括使气体与吸湿剂(其与湿气相结合)接触,并且将湿气和吸湿剂从气体中分离。从气体中分离较高分子量烃的步骤可包括冷却气体,使气体迅速掠过限流部使得较高分子量烃凝结以形成液体,并且将液体从气体中分离。在该示例中,在冷却步骤期间,来自液体的热量被传递至气体。备选地,冷却的步骤包括导引气体通过冷却器。液体可被传输至远离井眼的场外位置。从气体中移除湿气的步骤可包括使气体与分子筛接触。压缩天然气可被输送至容器,在此容器被运输至远离井眼的位置。将气体加压的步骤可在井眼附近进行。可在将气体加压至级间压力的步骤之前将湿气从气体中移除。
生产压缩天然气的另一示例方法包括直接从井眼接收一定量的气体,将气体加压至级间压力,在级间压力将气体去湿以形成干燥气体,并且压缩干燥气体以形成压缩天然气。干燥气体可包括较高分子量烃和较低分子量烃的混合物,该方法此外可包括在级间压力将较高分子量烃从干燥气体中分离。在该示例中,分离较高分子量烃的步骤包括利用较低温度流体冷却干燥气体,较低温度流体选自包括较高分子量烃、冷却流体以及它们的组合的液体。在级间压力将气体去湿的步骤可包括使气体与吸湿剂接触。
本文中还公开了用于生产压缩天然气的系统的一示例,其由以下组成:级间调节系统,其带有用于将湿气从来自井眼的气体中移除的去湿系统;升压压缩机,其具有与来自井眼的气体连通的抽吸线和与级间调节系统连通的排出线;压缩机,其具有与去湿系统的出口连通的抽吸线和具有压缩天然气的排出线。该系统也可具有在级间调节系统中的分离箱用于从气体中分离较高分子量烃。去湿系统可选地具有带有用于吸湿剂的喷射系统的箱。该去湿系统可选地包括具有分子筛的箱。
附图说明
已说明了本发明的一些特征和优点,其他的当结合附图进行说明时将变得显而易见,其中:
图1示出了用于处理来自井眼的流体的系统的一示例的示意图。
虽然将结合优选的实施例来说明本发明,应理解的是并不意图将本发明限制于该实施例。相反,意图覆盖可被包括在如由所附权利要求所限定的本发明的精神和范围内的所有备选方案、改型和等同物。
具体实施方式
下面参考示出了实施例的附图现在将更完整地来说明本公开的方法和系统。本公开的方法和系统可成许多不同的形式并且不应被解释为限制于本文中所述的所说明的实施例;而是,这些实施例设置成使得本公开将是彻底和完整的、并且将向本领域技术人员充分地传输其范围。相似的数字全篇涉及相似的元件。在实施例中,使用术语“大约”包括所引用的量+/-5%。在实施例中,使用术语“大致”包括所引用的量+/-5%。
应进一步理解的是本公开的范围不限于结构、操作的具体细节、具体材料或所示出的和所说明的实施例,因为改型和等同物将对于本领域技术人员是显而易见的。在附图和说明书中,公开了说明性实施例并且,尽管采用了特定术语,但是它们仅以通用的且说明性的意义来使用而不用于限制目的。
在图1中示意性地示出了压缩天然气(CNG)系统10的示例。CNG系统10是在示出安装在与岩层16相交的井眼14之上的井头组件12下游。来自井眼14的烃(液体和气体两者)通过井头组件12来产生并且从井头组件12经由所连接的生产线18来传输。生产线18终止于集管头(header)20。集管头20可选地可以是还传输来自其他井头组件(未示出)的生产流体的其他生产线22、24、26的终点。供给线28提供在集管头20与CNG系统10之间的连通手段。远离集管头20的供给线28的端部在排出鼓(knock out drum)30中终止并且其可选地提供分离来自供给线28的水和其他液体的方式。泄排线32连接至排出鼓30的底部并且导引从在供给线28中的流体流分离出的液体。导引到排出鼓30中的在供给线28中的流体的气体部分通过示出从排出鼓30的上端延伸的头顶线(overhead line)34离开排出鼓30。头顶线34的远离排出鼓30的端部连接至压缩机36的抽吸线。在图1的示例中,压缩机36包含升压压缩机38和CNG压缩机40。在该示例中,头顶线34终止于升压压缩机38的抽吸端处使得在头顶线34中的气体可被加压至级间压力。
从升压压缩机38排出的级间气体在级间调节系统42中被处理。更具体地,排出线46提供了在升压压缩机38的排出侧至脱水单元48之间的接通。在一备选方案中,用于将吸湿剂注射到中间级气体流动流中的注射线50被示出连接至脱水单元48。在一示例中,吸湿剂包含三甘醇(TEG),并且将包含在级间气体内的湿气提取出。排出线52被示出连接至脱水单元48,并且提供了用于从中间级气体中移除湿气的手段。头顶线54被示出连接至脱水单元48的上端并且其被导引至换热器56。在换热器56内,来自头顶线内的流体与流过底部线58的流体热连通;在此底部线58连接至液态天然气(NGL)箱60的下端。在换热器56下游,头顶线54连接至换热器62。流过换热器62的另一侧的是来自头顶线64的流体,在此如所示出的那样头顶线64附连至NGL箱60的上端。与头顶线54成一线地,可选的冷却器66示出在换热器62下游。另外在图1的示例中,控制阀示出在头顶线54中并且恰好在头顶线54与NGL箱60相交处的上游。在底部线58内的液体被传输至现场外70,并且经由也示出设置在底部线58内的阀72被控制至现场外70。阀72可以马达或手动地来操纵。
头顶线64被示出连接至CNG压缩机40的抽吸端并且在此在头顶线64内的气体被压缩至CNG压力。排出线74连接至CNG压缩机40的排出侧并且提供了用于将压缩天然气从CNG压缩机40导引至管拖车(tube trailer)76的运输手段。可选地,阀78设置在排出线74中并且用于调整经过排出线74的流,并且设置成选择性地填充管拖车76。备选地,每个升压压缩机38可包含第一级80和第二级82。在该示例中,从第一级80的排出物流过第二级82的抽吸部用于额外加压。类似地,CNG压缩机40包含第一级84和第二级86,其中,在第一级84内的气体被传输至第二级86的抽吸侧用于额外压缩。存在示例,其中,升压压缩机38和CNG压缩机40是往复式压缩机,并且其中,每个具有大量轴柄,其中,这些轴柄中的一些可以是通常所称的串联轴柄(tandem throws)。
在操作的一示例中,多相流体从井14流过线18、20、28并且被导引至排出鼓30。存在实施例,在此流过这些线的流体包含至少一定量的火炬气,其可能通常被运送至火炬和燃烧现场。本公开的优点是能够经济地且高效地生产可被捕获并且最终上市销售的大量压缩天然气。在线28中的流体内的液体流出至排出鼓30的底部部分并且被与在流体内的气体分离。气体从在鼓30内被导引到头顶线34中。头顶线34将气体运输至升压压缩机38的抽吸部,在此在一示例中,气体被从预期的在50至100psig之间的压力加压到400psig的压力,并且其形成级间气体。可能包含烃的气体经过线46被导引到脱水单元48中。为了本文的讨论,较低分子量烃指的是具有高达两个碳原子的那些,其中,较高分子量烃包括具有三个或更多碳原子的那些。为了从在线46中的级间气体内移除湿气,吸湿剂从注射线50被导引到脱水单元48中并且允许接触在脱水单元48内的气体。备选地,分子筛88可设置在脱水单元48内。吸湿剂或筛那么可吸收在级间气体内的湿气。筛可在一段时间后被再生(通过压力摆动吸附或温度摆动吸附)以移除在筛中的空间缝隙内所捕获的湿气。
为了从在头顶线54中的级间气态混合物中移除较高分子量烃,组成混合物的流体在换热器56和换热器62内被冷却并且迅速掠过阀68。冷却流体流,并且然后降低横跨阀68的压力,是焦耳-汤普森分离方法的一示例并且可从溶液中凝结出较高分子量烃且进入箱60中。产生的冷凝物可被从箱60内重力供给且至现场外70。示意性示出了可选的火炬90与来自井眼14的流体经由集管头20的端部连通。当CNG系统10被维修或以其它方式停止工作时,在集管头20中的流体可被引至火炬90。
在备选方案中采用可选的冷却器66,较高分子量烃通过机械冷却单元而非焦耳-汤普森的气体调节方法被从流体流中分离出。在采用焦耳-汤普森方法的示例中,来自升压压缩机38的排出可在大约1000psig。在使用机械冷却方法的示例中,来自升压压缩机38的排出可处于大约400psig的压力。在级间压力处理气体的优点是能够从气体中移除额外的湿气以及使较高分子量烃的分离最佳。因此,更高质量的压缩天然气可被获得并且经由排出线74被输送至管拖车76中。而且,更高质量的NGL可被输送至现场外70。在当前已知的过程中,有时添加甲醇至气体混合物以防止在气体处理过程中形成水合物。然而,添加甲醇不仅昂贵,并且降低了最终产品的质量和可销售性。
因此,本文中所描述的本发明很好地适合于实施这些目的并且获得所提及的目标和优点以及其中固有的其他。尽管为了公开的目的给出了本发明的当前优选的实施例,在过程的细节中存在大量变化以实现想要的结果。这些和其他类似的改型对于本领域技术人员将是容易想到的,并且意图被包含在本文中所公开的本发明的精神和所附权利要求的范围内。
Claims (18)
1.一种生产压缩天然气的方法,其包括:
a. 从井眼获得包括较高分子量烃和较低分子量烃的气体;
b. 将来自所述井眼的所述气体加压至在升压压缩机与CNG压缩机之间的级间压力;
c. 当所述气体处在所述级间压力时将湿气从所述气体中移除以形成干燥气体;
d. 当所述气体处在所述级间压力时从所述气体分离所述较高分子量烃以形成天然气;并且
e. 将所述天然气加压以形成压缩天然气。
2.根据权利要求1所述的方法,其中,从所述气体移除湿气的步骤包括使所述气体与吸湿剂接触,所述吸湿剂与所述湿气相结合,并且将所述湿气和吸湿剂从所述气体中分离出。
3.根据权利要求1所述的方法,其中,从所述气体分离所述较高分子量烃的步骤包括冷却所述气体、使所述气体迅速掠过限流部使得所述较高分子量烃凝结以形成液体,并且将所述液体从所述气体中分离。
4.根据权利要求3所述的方法,其中,冷却的步骤包括将热量从所述液体传递至所述气体。
5.根据权利要求3所述的方法,其中,冷却的步骤包括导引所述气体通过冷却器。
6.根据权利要求3所述的方法,其此外包括导引所述液体至远离所述井眼的场外位置。
7.根据权利要求1所述的方法,其中,从所述气体移除湿气的步骤包括使所述气体与干燥材料接触。
8.根据权利要求1所述的方法,其此外包括将所述压缩天然气导引至容器,并且将所述容器运输至远离所述井眼的位置。
9.根据权利要求1所述的方法,其中,将所述气体加压的步骤靠近所述井眼进行。
10.根据权利要求1所述的方法,其此外包括在将所述气体加压至所述级间压力的步骤之前将湿气从所述气体中移除。
11.一种生产压缩天然气的方法,其包括:
直接从井眼接收一定量的气体;
将所述气体加压至在升压压缩机与CNG压缩机之间的级间压力;
在所述级间压力将所述气体去湿以形成干燥气体;并且
压缩所述干燥气体以形成压缩天然气。
12.根据权利要求11所述的方法,其中,所述干燥气体包括较高分子量烃和较低分子量烃的混合物,所述方法此外包括在所述级间压力将所述较高分子量烃从所述干燥气体中分离出。
13.根据权利要求12所述的方法,其中,分离所述较高分子量烃的步骤包括利用较低温度流体冷却所述干燥气体,所述较低温度流体选自包括所述较高分子量烃、冷却流体以及它们的组合的液体。
14.根据权利要求11所述的方法,其中,在所述级间压力将所述气体去湿的步骤包括使所述气体与吸湿剂接触。
15.一种用于生产压缩天然气的系统,其包括:
在升压压缩机与CNG压缩机之间的级间调节系统,其包括用于将湿气从来自井眼的气体移除的去湿系统;
升压压缩机,其具有与来自所述井眼的所述气体连通的抽吸线和与所述级间调节系统连通的排出线;以及
CNG压缩机,其具有与所述去湿系统的出口连通的抽吸线和具有压缩天然气的排出线。
16.根据权利要求15所述的系统,其此外包括在所述级间调节系统中的分离箱用于从所述气体中分离较高分子量烃。
17.根据权利要求15所述的系统,其中,所述去湿系统包括具有用于吸湿剂的喷射系统的箱。
18.根据权利要求15所述的系统,其中,所述去湿系统包括具有干燥材料的箱。
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