CN104220693B - 用于自动缩短地下煤气化的注入管的牺牲性衬里连结件 - Google Patents
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Abstract
提供了牺牲性衬里连结件,其可用于自动地缩短用于地下煤气化工艺的衬里。所述牺牲性衬里连结件可以是一个或多个牺牲性衬里连结件部分,其间隔在一个或多个衬里部分之间,其中所述牺牲性衬里连结件部分在一个或多个衬里部分之前分解,以自动地缩短衬里。
Description
B. E. 戴维斯
C. W. 马勒特
M. R. 马克。
优先权要求
本申请是2013年6月21日提交的PCT专利申请No. US13/47168的国家阶段申请并要求该专利申请的优先权,该PCT专利申请进而根据巴黎公约要求2012年6月28日提交的美国专利申请序列号13/536,082的优先权,这两个专利申请的全体内容通过引用并入本文。
技术领域
本公开总体上涉及地下煤气化(“UCG”),并且特别涉及用于地下煤气化的牺牲性衬里连结件。
背景技术
众所周知的是:地下煤可以被气化,并且煤气化工艺(UCG工艺)产生合成气。该工艺涉及煤层内的平行水平钻孔之间的气化反应器腔体(反应器)的操作,所述煤层通过一个钻孔(注入井)被供给氧化剂气体,示例为空气、氧气、蒸汽或这些气体的组合。在煤层点火之后,煤与注入氧化剂气体之间的气化反应形成合成气(CO、CO2、H2、CH4和其它气体的混合物),并且合成气经由第二钻孔(产品井)被移除。
在煤气化工艺中,存在发生的多个反应,其生成合成气。那些反应包括:
C+H20=H2+CO(多相水-气转化反应)
CO+H20=H2+CO2(转化变换)
CO+3H2=CH4+H20 (甲烷化)
C+2H2=CH4(氢化气化)
C+1/2O2=CO(部分氧化)
C+O2=CO2(氧化)
C+CO2=2CO(Boudouard反应)。
在典型的UCG工艺中,随着煤被气化工艺移除,腔体在尺寸上长大,并且煤面逐渐移动,因为煤被横跨所述面流动的热气移除。当注入气体经由注入井内的衬里供给到反应器中时,气体的排放点固定在注入井衬里的端部处。随着反应器的长大,热的气化反应区域移动离开氧化剂气体的注入点,其降低气化工艺的效率,从而导致产品质量的下降。存在已知的注入点缩短工艺,其被称作连续回缩注入点(CRIP)。
用以维持气体质量的当前所用方法是移动氧化剂气体的注入点,以匹配煤气化面的移动,使得注入气体总是接近新鲜的煤,从而使产品质量得到维持。注入井衬里的端部的移动通常由以下方式实现:通过切断一段衬里重新定位用于氧化剂气体的输送点来缩短衬里,或者沿注入井向上缩回衬里,其移动注入点。切割注入井衬里或者从注入井缩回它都实现注入点的再定位,但是需要显著的后勤操作和从表面操作的专用设备,以实现这些目的。希望的是能够随气化面的移动而移动氧化剂气体的注入点,而无需使用插入注入井中以及从表面操作的装置,比如切割器或衬里缩回设备。
因此,希望的是提供牺牲性衬里连结件来自动地缩短用于地下煤气化的衬里,并且本公开正是针对此目的。用于进行缩短的该牺牲性衬里连结件工艺可适用于需要注入点在煤层内的水平注入井中重新定位的所有UCG动作。
附图说明
图1示出了一个示例的地下煤气化设备,其可以利用牺牲性衬里连结件;
图2示出了用于自动地缩短衬里的牺牲性衬里连结件和反应器的近视图;
图3示出了地下煤气化工艺的详情,其中衬里的牺牲性衬里连结件受到UCG工艺的热的冲击;并且
图4示出了地下煤气化工艺的详情,这时牺牲性衬里连结件被消除从而自动地缩短衬里。
具体实施方式
本公开特别适用于地下煤气化工艺(UCG),其使用具有牺牲性衬里连结件的注入井衬里,并且正是在此背景中本公开将被描述。
图1示出了一个示例的地下煤气化设备10,其可以利用牺牲性衬里连结件。设备10可以包括注入井12、生产井14和发起井16。在UCG工艺期间,注入井12用于将氧化气体(比如空气、氧气、蒸汽或这些气体的组合,如浅蓝色箭头所示)注入反应器区域18(也称为气化腔体)中,其是在煤中最初通过钻孔形成随后通过煤的气化膨胀的腔体。腔体形成在注入点与煤层的顶篷之间,并横向地生长至气化工艺的极限。在UCG工艺期间,生产井14用于抽取在UCG工艺期间形成的合成气,如绿色箭头所示,而发起井16用于在煤层中发起气化工艺,如图1中的红色箭头所示。井中的每个具有:套管20(201是注入井的套管,202是生产井的套管,且203是发起井的套管,但是在图1中未示出);和衬里22(221是注入井的衬里,222是生产井的衬里,且223是发起井的衬里,但是在图1中未示出),其处于每个套管内。套管的典型直径是250mm,而衬里的是100~130mm。在以下的公开中,我们关注注入井衬里221。在UCG工艺期间,煤被气化,并且气化腔体移动离开注入点,其处于注入井衬里和注入井的端部处。在图1中的示例中,气化工艺的方向24是从右到左,如箭头所示。UCG工艺的关键方面是移动氧化剂气体的注入点,以匹配煤气化面的移动,而不必切割注入井衬里或回缩注入井衬里,如现在将更详细地描述的。
图2示出了用于自动地缩短衬里的牺牲性衬里连结件和反应器的近视图。注入井12具有点30,在此处氧化气体被注入处于注入衬里221的端部处的气化腔体18中。如图2中示出的,注入井具有衬里221和处于钻孔的边缘与衬里之间的环带26。注入衬里221可以具有一个或多个衬里部分(比如图2中的22a、22b、22c、22d)和介于衬里部分之间的一个或多个牺牲性衬里连结件32(比如图2中示出的示例中的衬里部分321、322和333)。衬里22通常具有处于6~8米的周期性间隔处的牺牲性衬里连结件。注入衬里221可以由钢(或相似材料)制成,以承受UCG工艺的严酷条件。钢在低于600℃的温度时可能不会熔化/分解。每个牺牲性衬里连结件32(其也可以被称作连结件)可以由这样的材料制成,该材料在低于钢衬里熔化/分解温度的温度时发生熔化/燃烧/分解。例如,每个牺牲性衬里连结件32可以由玻璃纤维或树脂材料制成。典型树脂是高温环氧工具树脂。牺牲性衬里连结件和衬里部分通过螺纹接头接合在一起。在图2中示出的一个实施例中,衬里和衬里部分具有圆形形状(类似管),而每个牺牲性衬里连结件部分32具有正方形或长方形形状。然而,每个牺牲性衬里连结件部分32也可以具有其它形状,包括圆形形状,类似于其它衬里部分。在图2中示出的构造中,沿着注入井衬里的长度的温度小于200摄氏度,并且衬里部分和牺牲性衬里连结件都允许氧化气体流动至处于衬里之内的气化腔体。
图3示出了地下煤气化工艺的详情,其中衬里的牺牲性衬里连结件受到UCG工艺的热区域的冲击。如图3中示出的,已经被气化腔体的热区域包住的特定牺牲性衬里连结件部分发生变形、燃烧或熔化(可能进入气化腔体中),其导致注入井衬里的长度在适当的时间自动地缩短(如图4中示出的),使得氧化剂气体的注入点(在衬里的端部处)自动地随煤面移动。例如,在一个实施例中,牺牲性衬里连结件部分可以在大约350摄氏度的温度时熔化/分解。
虽然前述内容是参考本发明的特定实施例描述的,但是本领域的技术人员将理解的是:可以在该实施例中做出变化,而不背离本公开的原理和精神,本公开的范围由所附权利要求书限定。
Claims (9)
1.一种用于地下煤气化工艺的注入井衬里,所述注入井衬里包括:
所述注入井衬里的近端和远端,氧化气体被注入通过所述注入井衬里以用于地下煤气化工艺,所述氧化气体在所述近端被注入并且在所述注入井衬里的远端输出,所述注入井衬里具有一个或多个衬里部分和处于所述一个或多个衬里部分之间的一个或多个牺牲性衬里部分;并且
其中,所述一个或多个牺牲性衬里部分中的每个由于地下煤气化工艺期间的温度而各自地完全地发生分解,使得每个牺牲性衬里和连接到每个牺牲性衬里的远端的所述衬里部分退化,并且所述注入井衬里在所述地下煤气化工艺期间自动地缩短。
2.如权利要求1所述的注入井衬里,其中,所述一个或多个牺牲性衬里部分中的每个在比所述一个或多个衬里部分低的温度时分解。
3.如权利要求2所述的注入井衬里,其中,所述一个或多个牺牲性衬里部分中的每个在350摄氏度的温度时分解。
4.如权利要求1所述的注入井衬里,其中,所述一个或多个牺牲性衬里部分中的每个由玻璃纤维和树脂之一制成。
5.如权利要求1所述的注入井衬里,其中,所述一个或多个牺牲性衬里部分中的每个与另一牺牲性衬里部分之间具有预定的距离。
6.如权利要求1所述的注入井衬里,其中,所述一个或多个牺牲性衬里部分中的每个发生熔化。
7.如权利要求1所述的注入井衬里,其中,每个衬里部分由钢制成。
8.如权利要求4所述的注入井衬里,其中,所述树脂是高温环氧工具树脂,具有与钢质衬里部分相当的机械性能。
9.如权利要求1所述的注入井衬里,其中,每个衬里部分和每个牺牲性衬里部分通过螺纹接头连接在一起。
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US9435184B2 (en) * | 2012-06-28 | 2016-09-06 | Carbon Energy Limited | Sacrificial liner linkages for auto-shortening an injection pipe for underground coal gasification |
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CN104220693A (zh) | 2014-12-17 |
AU2013280775B2 (en) | 2016-09-29 |
US9435184B2 (en) | 2016-09-06 |
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AU2018267570B2 (en) | 2021-01-21 |
EP2867442A4 (en) | 2016-06-15 |
AU2013280775A1 (en) | 2015-02-12 |
HK1205222A1 (zh) | 2015-12-11 |
US9963949B2 (en) | 2018-05-08 |
EP2867442A1 (en) | 2015-05-06 |
CL2014003539A1 (es) | 2015-10-23 |
AU2018267570A1 (en) | 2018-12-13 |
WO2014004323A1 (en) | 2014-01-03 |
US20140000873A1 (en) | 2014-01-02 |
AU2016244342A1 (en) | 2016-11-17 |
US20160356110A1 (en) | 2016-12-08 |
HK1246837A1 (zh) | 2018-09-14 |
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