CN105627087B - 一种用于气田高低压伴生气综合回收利用系统 - Google Patents
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Abstract
本发明公开了一种用于气田高低压伴生气综合回收利用系统,包括高压脱水单元、低压脱水单元、CNG压缩机、CNG压缩加气机、两个燃气发电机组和高压脱水单元加气机,CNG压缩机连接在低压脱水单元和CNG压缩加气机之间,高压脱水单元与高压脱水单元加气机连接,高压脱水单元的进口上连接有紧急截断阀,低压脱水单元的进口与高压脱水单元的进口之间连接有调压阀,低压脱水单元和CNG压缩机之间通过减压阀分别连接两个燃气发电机组。本发明系统既能满足试采期时的加注需求,又能够满足正常开采期的加注需求,同时满足正常开采时气源压力衰减状况下的加注需求;两个加注系统可单独使用,也可组合使用,降低能耗,节省投资。
Description
技术领域
本发明涉及石油天然气领域,具体是一种用于气田高低压伴生气、试采气综合回收利用系统。
背景技术
在石油或天然气的在开采过程中会连带许多石油伴生气及天然气,在试采过程中,此部分气体多数是以无效燃烧为主,不但浪费资源,同时产生大量的CO2加剧了温室效应。随着生活中对CNG这种清洁能源的需求量越来越大,公众对社会环境保护的日趋重视,如何充分有效的利用该部分CNG成了当前的重点。
就目前而言,回收试采气或伴生气的一个重要手段是建立CNG加注站,由于本部分气源通常位置比较偏远,因此更适合于建立CNG加气母站。现有的CNG加注母站,多是采用调压减压+低压前置脱水+CNG压缩机+CNG加注机的模式对CNG拖车进行加注,由于CNG原料气进入CNG压缩机前必须先减压然后再通过CNG压缩机增压,浪费能耗,且每个站均必须建一个独立的加注母站,规模化后投资较大。
发明内容
本发明的目的在于提供一种用于气田高低压伴生气综合回收利用系统,以解决上述背景技术中提出的问题。
为实现上述目的,本发明提供如下技术方案:
一种用于气田高低压伴生气综合回收利用系统,包括高压脱水单元、低压脱水单元、CNG压缩机、CNG压缩加气机、大功率燃气发电机组、小功率发电机组和高压脱水单元加气机,所述CNG压缩机连接在低压脱水单元和CNG压缩加气机之间,所述低压脱水单元的进口连接有第七截断阀,所述高压脱水单元与高压脱水单元加气机连接,高压脱水单元的进口上连接有紧急截断阀,所述低压脱水单元的进口与高压脱水单元的进口之间连接有调压阀,低压脱水单元的出口与高压脱水单元的出口之间连接有第三截断阀,所述低压脱水单元和CNG压缩机之间连接有减压阀,减压阀分别连接大功率燃气发电机组、小功率发电机组。
作为本发明进一步的方案:所述减压阀和大功率燃气发电机组之间连接有第六截断阀,减压阀和小功率发电机组之间连接有第五截断阀。
与现有技术相比,本发明的有益效果是:本发明系统既能满足试采期时的加注需求,又能够满足正常开采期的加注需求,同时满足正常开采时气源压力衰减状况下的加注需求;两个加注系统可单独使用,也可组合使用,降低能耗,同时可在不同气井站之间搭配使用,节省投资。
附图说明
图1为用于气田高低压伴生气综合回收利用系统的示意图。
图中:V1-紧急截断阀;V2-调压阀;V3-第三截断阀;V4-减压阀;V5-第五截断阀;V6-第六截断阀;V7-第七截断阀;E1-高压脱水单元;E2-低压脱水单元;E10-高压脱水单元加气机;E4-CNG压缩机;E5-CNG压缩加气机; E7-大功率燃气发电机组;E8-小功率燃气发电机组。
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。
如图1所示,一种用于油田及天然气田适采气回收的CNG加注母站系,包括高压脱水单元E1、低压脱水单元E2、CNG压缩机E4、CNG压缩加气机E5、大功率燃气发电机组E7、小功率发电机组E8和高压脱水单元加气机E10, CNG压缩机E4连接在低压脱水单元E2和CNG压缩加气机E5之间,低压脱水单元E2的进口连接有第七截断阀V7,高压脱水单元E1与高压脱水单元加气机E10连接,高压脱水单元E1的进口上连接有紧急截断阀V1,低压脱水单元E2的进口与高压脱水单元E1的进口之间连接有调压阀V2,低压脱水单元E2的出口与高压脱水单元E1的出口之间连接有第三截断阀V3,低压脱水单元E2和CNG压缩机E4之间连接有减压阀V4,减压阀V4分别连接大功率燃气发电机组E7、小功率发电机组E8,减压阀V4和大功率燃气发电机组E7之间连接有第六截断阀V6,减压阀V4和小功率发电机组E8之间连接有第五截断阀V5。
试采气原料气压力(压力1.0~3.0MPa)通过截断阀V7直接进入低压脱水单元E2,除去水分后经CNG压缩机E4增压值25.0MPa,通过CNG压缩加气机E5对CNG拖车进行加注。
试采气结束后进入正式开采期,开采期初期气源(压力大于20.0MPa且小于27.5MPa)通过高压脱水单元E1除去水分后通过高压脱水单元加气机E10对CNG拖车进行加注。
开采一段时间后原料气源压力衰减,当原料气压力低于20.0MPa且高于10.0MPa时,原料气通过紧急截断阀V1进入高压脱水单元E1除去水分,再通过高压脱水单元加气机E10对CNG拖车进行加注,当拖车压力与原料气压力平衡后,关于高压脱水单元E1,通过调压阀V2将原料气减压至3.0MPa,然后送入低压脱水单元E2,除去水分后进入CNG压缩机E4增压至25.0MPa,最后通过第三截断阀V3进入高压脱水单元加气机E10对CNG拖车进行充压。
当原料气压力小于10.0MPa时,原料气通过紧急截断阀V1直接进入调压阀V2,将压力减至3.0MPa,送入低压脱水单元E2,除去水分后进入CNG压缩机E4增压至25.0MPa,再通过第三截断阀V3进入CNG压缩加气机E5对CNG拖车进行充压,此时可将高压脱水单元E1(含加注机E10)拆运至其余气源地继续使用。
在试采期间,少量CNG原料气经第七截断阀V7送入低压脱水单元E2除去水分后,通过减压阀V4将压力进一步降低后分别送入大功率燃气发电机组E7、小功率燃气发电机组E8进行发电。
试采期结束后,在CNG压缩机E4不开启的情况下,在通过高压脱水单元E1的干燥CNG气体中引少量气体送入调压阀V2减压,通过管线引至减压阀V4减压后送入小功率燃气发电机组E8,发电后供装置实用。
在需要启动CNG压缩机E4的情况下,少部分原料气通过高压脱水单元E2后,送入减压阀V4减压后分别送入大功率燃气发电机组E7、小功率燃气发电机组E8进行发电。
对于本领域技术人员而言,显然本发明不限于上述示范性实施例的细节,而且在不背离本发明的精神或基本特征的情况下,能够以其他的具体形式实现本发明。因此,无论从哪一点来看,均应将实施例看作是示范性的,而且是非限制性的,本发明的范围由所附权利要求而不是上述说明限定,因此旨在将落在权利要求的等同要件的含义和范围内的所有变化囊括在本发明内。不应将权利要求中的任何附图标记视为限制所涉及的权利要求。
Claims (1)
1.一种用于气田高低压伴生气综合回收利用系统,包括高压脱水单元(E1)、低压脱水单元(E2)、CNG压缩机(E4)、CNG压缩加气机(E5)、大功率燃气发电机组(E7)、小功率发电机组(E8)和高压脱水单元加气机(E10),其特征在于,所述CNG压缩机(E4)连接在低压脱水单元(E2)和CNG压缩加气机(E5)之间,所述低压脱水单元(E2)的进口连接有第七截断阀(V7),所述高压脱水单元(E1)与高压脱水单元加气机(E10)连接,高压脱水单元(E1)的进口上连接有紧急截断阀(V1),所述低压脱水单元( E2)的进口与高压脱水单元(E1)的进口之间连接有调压阀(V2),低压脱水单元(E2)的出口与高压脱水单元(E1)的出口之间连接有第三截断阀(V3),所述低压脱水单元(E2)和CNG压缩机(E4)之间连接有减压阀(V4),减压阀(V4)分别连接大功率燃气发电机组(E7)、小功率发电机组(E8);所述减压阀(V4)和大功率燃气发电机组(E7)之间连接有第六截断阀(V6),减压阀(V4)和小功率发电机组(E8)之间连接有第五截断阀(V5)。
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