CN1258637C - 用于监测井下井管道中流体流速的方法 - Google Patents
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Abstract
用于监测井下井管道中流体流速的方法,利用一种可变形的容器,该可变形的容器包括液体示踪材料,可变形容器具有一个出口,该出口通向井管道内的文丘里管颈部中。容器具有一个壁,该壁至少一部分易受文丘里管比较宽的入口或出口处流体压力的影响,因此将适当量示踪物连续或不连续地注入井流出物中,示踪物量与文丘里管两头的压力差(p)成正比,该压力差(p)与流体密度(ρ)和流体速度(v)平方有关。
Description
技术领域
本发明涉及一种用于监测井下井管道中流体流速的方法。这种方法从欧洲专利申请NO.0816631中已知。
背景技术
在已知的示踪物释放法中,是将不同类型的示踪物沿着井下流入区的长度埋在包层中。包层可以是油溶性物质,该物质缓慢地溶于井流体中,并且所释放的示踪物量因此是在一特定位置进入井中的油和/或气体量的指示。
已知方法的缺点是:为监测井流出物的流量,需要大量示踪物和包层;为了在示踪物耗尽之后更换包层的壁管道,需要大量的修井操作;和所释放的示踪物量不是流过井的流体量的准确反映,而且还视井流出物的温度和组成而定。
已知美国专利NO.4,846,279公开了一种方法,该方法利用一个袋将一种处理流体注入一口井的下端,该袋被井的下游位置和上游位置之间的压力差压缩。美国专利NO.5,544,785公开了一种方法,该方法用于用一个容器将一种硬化剂井下注入水泥浆中,通过文丘里效应将硬化剂从容器注入水泥浆。
美国专利NO.4,166,216公开了一种方法,该方法通过一个注射工具用于将各种油和/或水可混合的示踪物材料注入生产管道中,该注射工具是临时在井中悬挂在一根钢丝绳上。
发明内容
本发明的目的是减少已知示踪物注射法的缺点,并提供一种用示踪物释放法来监测井下管道中流体流速的方法,该示踪物释放法能更准确地反映流体流速,能更容易更换,能将一种准确计量的最少量示踪物材料释放到井流出物中和能将流体流速之外的其它井数据传送到地面处的井流体流量监测和测量系统中。
按照本发明,提供了一种用于监测井下井管道中流体流速的方法,该方法包括:在井中插入一个可变形的容器,该可变形的容器装有示踪物材料,容器与井管道中形成的文丘里管成流体连通,以便在使用时,示踪物材料通过容器的出口释放到管道中,示踪物材料的释放量与文丘里管颈部和管道中有比文丘里管的颈部更宽的内宽度的部分之间的静压差有关:在文丘里管下游处,检测每单位时间流过管道的示踪物材料量;在文丘里管下游处,测量流过管道的释放示踪物材料量;和根据上述测量确定在文丘里管中的流体速度和/或密度。
优选地,可变形容器的至少一部分壁易受到上述管道中有比文丘里管的颈部更宽的内宽度的部分内静压力的影响,并且容器的出口通向文丘里管的颈部中。
因为如在文丘里管入口处,在颈部和上述较宽部分之间的静压力差,按照Bernouilli定律,是与1/2ρ·v2成正比,式中ρ是流体密度,而v是流体速度,所以在那种情况下,所释放的示踪物量与流体密度和流体速度的平方成正比。
或者,可变形容器用一个弹簧压缩,和壁易受到颈部处较低静流体压力的影响,及示踪物出口通向管道的较宽部分比如文丘里管的下游,因此当流体密度ρ和/或速度v降低时,所释放的示踪物的量也减少。
优选地,可变形容器安装在一个邻近文丘里管的基本上是管状的侧袋内,容器至少一部分是软袋,该软袋以可收回式安装在上述侧袋内,及文丘里管和容器安装在一个套管内,该套管装配在井流入区之内或附近的井管道的内壁之内,并可以固定在井管道的内壁上。
可任选地,容器的出口装备有一个阀,该阀在选定的时间间隔中打开出口。阀可以用一个时钟或用一个按预定图形按顺序打开和关闭阀的装置启动,使得脉动式释放示踪物材料代表一个信号,该信号相当于用一传感器测得的物理参数,如压力、温度或流体流速和/或成分,上述传感器放在文丘里管中或文丘里管附近。
附图说明
本发明将参照附图通过例子更详细地加以说明,附图中:
图1是按照本发明所述示踪物释放系统第一实施例纵向剖视图;
图2是图1系统的横剖视图;
图3是按照本发明所述示踪物系统第二实施例纵向剖视图;和
图4是图3的系统横断面视图。
具体实施方式
现在参见图1和2,图1和2示出了一种连续示踪物注射系统,该注射系统包括一个细长的袋1,该袋1装满一种液体示踪物,如关于遗传密码组成的一种放射性物质或荧光剂。
袋1安装在一个管状空腔2中,该管状空腔2邻近井下文丘里管4的颈部3,该颈部3安装在一个并套管5内,该井套管5可以可回收式安装在一个井(未示出)流入区内的一个井管(未示出)中。
空腔2通过一个流体通道6,与文丘里管4入口处的有比文丘里管的颈部更宽的部分,或称较宽部分9成流体连通。
袋1在其上端处具有一个流体出口7,该流体出口7通过一个径向出口通道8,与文丘里管4的颈部3成流体连通。在使用时,流体流将在文丘里管4的入口处,以一个流体速度v流过套管5,并且在颈部3处将增加到一个更高的速度,按照Bernouilli定律,这种情况将产生一个静压差,该静压差与1/2ρ·v2成正比,式中ρ是流体密度,而v是流体速度。
因为袋1的流体压力等于颈部3中的流体压力,而在袋1下面的空腔2中的流体压力等于文丘里管4的入口处的较宽部分9内的流体压力,所以袋1的底部将被一个压力P~1/2ρ·v2往上推,该压力开始压缩袋并挤出示踪物材料的一个流量T,该流量T与压力差p成正比,并因此与流体密度ρ和速度v的平方成正比。
因此,通过用地面处的一个检测装置,检测每单位时间释放的示踪物量T,可以获得有关井下流体速度v和/或密度ρ,上述检测装置如果采用放射性示踪物的话可以是盖革(Geiger)计数器,或者采用荧光示踪物的光源和反射装置。
现在参见图3和4,图3和4示出了一种不连贯的示踪物注射系统,该系统包括一个袋10,袋10装满一种液体示踪物材料。
袋10安装在一个管状空腔11中,该空腔11平行于文丘里管13的颈部12,文丘里管13安装在一个套管14中,该套管14可以可收回式插入油和/或气体生产井(未示出)流入区内的井管(未示出)中。
袋10具有一个出口15,该出口15间歇式将示踪物材料释放到示踪物注射口16中,该注射口16通过一个阀17通向文丘里管13的颈部12。
阀17装有一个电池组18和一个转向装置19,该电池组18供给电力以便启动阀17,而转向装置19包括一个时钟和/或温度、流体成分传感器20,转向装置19按照一个图形以一定的时间间隔促使阀打开和关闭,该图形代表反映由传感器20所检测的温度和/或其它物理数据的信号。不连贯的打开阀17使示踪物材料T间歇地注入流体流中,注射图形可以用地面处的示踪物检测装置检测。
与图1的系统中一样,施加到袋10上的压力p与1/2ρ·v2成正比,因此每单位时间所释放的示踪物量,提供有关井下流体速度v和/或密度ρ的信息。
因此,按照本发明所述的示踪物释放系统可以用作一个井中的混合速度测量和无线数据传输系统,该示踪物释放系统可以工作几年,直至袋10和电池18耗尽为止。
套管14可以可松脱式安装在油和/或气体生产井流入区中开槽的衬管的无槽部分内。在这种情况下,优选的是,上述无槽部分可以装备一个外部可膨胀的密封圈,该密封圈将围绕衬管无槽部分的环形空间密封,以便促使井流出物流过套管14内部。
Claims (12)
1.一种用于监测井下并管道中流体流速的方法,该方法包括:
-在井中插入一个可变形的容器,该可变形的容器装有示踪物材料,容器与井管道中形成的文丘里管成流体连通,以便在使用时,示踪物材料通过容器的出口释放到管道中,示踪物材料的释放量与文丘里管颈部和管道中有比文丘里管的颈部更宽的内宽度的部分之间的静压差有关:
-在文丘里管下游处,检测每单位时间流过管道的示踪物材料量;
-在文丘里管下游处,测量流过管道的释放示踪物材料量;和
-根据上述测量确定在文丘里管中的流体速度和/或密度。
2.按照权利要求1所述的方法,其特征在于:可变形容器的至少一部分壁易受到上述管道有比文丘里管的颈部更宽的内宽度的部分内的静压力作用,并且容器的出口通向文丘里管的颈部。
3.按照权利要求2所述的方法,其特征在于:可变形的容器安装在管道壁中一个空腔内。
4.按照权利要求3所述的方法,其特征在于:空腔是一种是管状的侧袋,而可变形的容器至少一部分是软袋,该软袋以可收回式安装在上述侧袋内部。
5.按照权利要求3所述的方法,其特征在于:文丘里管和可变形容器安装在一个套管中,该套管装配在井的流入区内的井管道内壁内,并可以固定到井管道的该内壁上。
6.按照权利要求1所述的方法,其特征在于:井具有多个流入区,并且在一个或多个流入区的下游,设置至少一个示踪物释放系统。
7.按照权利要求6所述的方法,其特征在于:还包括在井中插入另外的多个装有示踪物材料的可变形容器,所述的另外的多个容器装有不同的示踪物材料。
8.按照权利要求1所述的方法,其特征在于:容器的出口装备一个阀,该阀适合于在一个或一个以上选定的时间间隔中打开出口。
9.按照权利要求8所述的方法,其特征在于:阀通过一个时钟启动,该时钟适合于以一预先设定的时刻和在一预定的时间间隔中打开阀。
10.按照权利要求6所述的方法,其特征在于:井设置多个示踪物释放系统,各示综物释放系统设置一个用时钟启动的阀,以使阀在不同的时刻打开。
11.按照权利要求8所述的方法,其特征在于:启动阀以便在选定的时间间隔中按顺序打开和关闭,并且上述时间间隔的长度代表一个信号,该信号代表由放入示踪物释放系统中的测量探头所测得的一个或一个以上的物理参数。
12.按照权利要求5所述的方法,其特征在于:套管以可松脱式固定在一段衬管中,该段衬管装备有一个外部可膨胀的密封圈,该密封圈禁止井流出物在套管位置处流过围绕衬管的环形空间。
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CN1432098A (zh) | 2003-07-23 |
NO20025745L (no) | 2003-01-29 |
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NO324289B1 (no) | 2007-09-17 |
CA2410398C (en) | 2009-04-07 |
CA2410398A1 (en) | 2001-12-06 |
EG22933A (en) | 2002-01-13 |
WO2001092685A1 (en) | 2001-12-06 |
EP1285148A1 (en) | 2003-02-26 |
AU2001266044A1 (en) | 2001-12-11 |
US6799634B2 (en) | 2004-10-05 |
NO20025745D0 (no) | 2002-11-29 |
EP1285148B1 (en) | 2004-09-01 |
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