CN101103176A - 用于改进采油的组合物和方法 - Google Patents
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Abstract
本发明包括有机化学物质的成本有效性定制的掺合物,用以增加产油量。本发明包括用于采油钻井操作的化学组合物以及使用所述化学组合物的方法。该化学组合物包括氨化合物、醇和含水载体溶液。所述含水载体溶液的体积足以使其可用于将氨化合物和醇完全溶于所述含水载体溶液中。
Description
相关申请
本专利申请要求2004年4月13日提交的美国临时专利申请系列号60/561669的优先权,在此全文引入作为参考。
技术领域
本发明涉及化学组合物以及该化学组合物用以提高油产量和储存量的用途。
背景技术
当地下岩层(formation)比如砂岩、碳酸盐或者页岩中存在着油时,通常可以通过在含油岩层中钻出井眼使得已有的压力梯度将油压出井眼而对油进行开发。这种方法称作一次开采。如果压力梯度不足以以所需速率开采油,那么惯常做法是采用改进的开采方法来开采另外的油。这种方法称作二次开采。一次采油及随后的二次采油,比如注入水或气体以压出另外的油,通常在许多油田中能够去除油层总油含量的大约30%。
在注水开采中,将高压水注入到一次开采后的含油岩层中,所述高压水来自相邻的烃生产井。从所述生产井中首先开采烃,随后开采烃和水。
即使在二次开采比如注水开发后,在原地仍然保留了大量的原油。重油、焦油和复杂岩层的未开采的烃的份数通常最高。在大型油田中,在常规注水开发后,可能留下多于十亿桶的油。除了注水开发以外,也采用注二氧化碳混相驱(carbon-dioxide-miscibleflood)方案。那么,三次开采就成了关注的交点。据预测,目前的三次采油技术能够去除保留在油层中的另外5-20%的油。考虑到目前世界上对化石烃的依赖性,可以断定开发出有效的三次采油策略来提高采油量将对经济有显著的影响。目前的三次开采方法有效,但成本高。目前的三次开采方法仍然在油田中就地残留了大量的原油。
在一次开采和二次开采后就地存留的油很多都由于毛细管力的作用而位于微型储油构造中,或者通过岩层中不能减少的油饱和度以及死油吸附到矿物表面上。迫使正常情况下固定不动的残油或者其它烃发生移动,通常称作三次采油。已知在注水开采阶段中采用微生物比如细菌来移动位于微型储油构造中或者吸附到矿物表面上的油,以去除多余的油。这通常涉及从外面引入微生物。这些微生物产生甲烷,甲烷随后被开采。
同样公知的是,聚合物和凝胶的或者交联的水溶性聚合物可用于提高油开采量和其它油田操作中。它们已被用于改变地下岩层的渗透性,以便提高注水采矿操作的有效性。一般而言,将在液体中的聚合物或者聚合物和凝结剂比如合适的交联剂一起注入到岩层中。基于微生物和基于聚合物的改进开采方法成本都很高。
在各种含烃岩石中发现的成岩组构和孔隙类型能够表明油层的流动能力、存储能力、以及注入水或CO2的潜力。目标是将油从存储能力高但开采率低的单元压到开采率高的单元。这样可以将油的开采量提高到预计的一次贫乏开采量以下,从而就地开采出更高百分比的原油。
常规三次采油操作包括将CO2或者水注入到油井中。为了提供采油量,需要有经改进的组合物。采用市售常规注入设施来降低成本消耗,将是很有利的。
为了使本国资源充分资本化,产油国必须通过采用先进的采油技术来提高国内的石油产量。运作公司在宣称可开采的储量时通常持保守态度,需要提高从已证实的储量上可以开采的储量,而不是开发未证实的储量。为了在每块油田就地最大量地开采原油,需要成本有效的采油技术。需要成本有效的采油技术通过更确切地描绘出最小油田尺寸和成功采油所需的其它参数,来降低开采成本。需要可以采用简单的或者当前的应用程序的三次采油技术。
美国专利No.6225263教导了通过向岩层中注入聚乙二醇的单烷基酯的水溶液,提高从地下岩层开采油和/或气体的方法。
美国专利No.3902557描述了通过注入溶剂对油井旁边的岩层进行处理的方法,其中所述溶剂包括聚乙二醇醚的C4-C10烷基醚,所述烷基醚含有聚乙二醇醚的C4-C10烷基醚,所述烷基醚每个分子含有10-22个碳原子。优选三和四乙二醇的C4-C8单烷基醚,尤其优选己基醚,也优选丁基醚。溶剂可以用有机液体比如醇例如异丙醇稀释。
法国专利No.2735524涉及采用占溶剂化物沥青烯1-5重量%的醇的二次开采和三次开采的方法。
需要有成本有效的组合物以及使用该组合物对采油进行改进的方法。需要对未能通过一次开采和/或二次开采方法开采的原油就地实现资本化。
发明内容
为了满足这些需求之一或多种,本发明有利地提供了用于三次采油的组合物和方法。本发明包括有机化合物的成本有效性定制掺合物,以促进油的生产。无论是通过表面活性剂或者溶剂的作用,这种组合物使圈闭在油层中的残余油得以流通。
本发明包括用于采油钻井操作中的化学组合物以及使用所述化学组合物的方法。化学组合物包括氨化合物、醇和含水载体溶液。含水载体溶液的体积足以使其能够完全溶解所述含水载体溶液中的氨化合物和醇。尽管不要求加热,但是温度略微升高显示出了积极效果。该化合物组合物使得氨化合物和醇大量分布在整个载体流体中。
在优选实施方案中,可用于本发明化学组合物中的醇含有大约1-大约6个碳原子。醇优选是非芳族醇。具体而言,含有1-4个碳原子的醇特别有用,即,甲基、乙基、丙基和/或丁基醇。在丙基醇中,特别优选异丙醇。醇优选量为化学组合物的4-16体积%。
在本发明的化学组合物中,优选的载体溶液是水。该溶液也可以是盐水,比如生成的水。优选含水载体溶液。在优选实施方案中,仅仅有一种载体溶液,就是水。优选载体溶液的量为化学组合物的大约76-94体积%。
化学组合物的氨化合物优选是氨或者氢氧化铵。氨化合物的量为化学组合物的大约2-8体积%。
氨化合物和醇的优选量限定了优选的比值范围。醇和氨化合物的优选比值为大约1∶1-大约3∶1(醇∶氨),所述比值为体积比。特别优选的醇氨比为大约2∶1。
本发明还包括用含有烃储量的烃岩石中开采烃的方法。本发明的方法包括向烃岩石中引入化学组合物,引入量能有效地显著提高从岩层中的烃开采量。随后,可以从同一油井或者油田中的其它油井开采所述烃岩层中的烃。
本发明可用作二次和/或三次开采。本发明的组合物相信能够提高井眼附近的岩层的渗透性。
附图说明
通过参考在附图(构成说明书的一部分)中举例说明的实施方案,可以对上面简要总结的本发明进行更详细的描述,由此可以更详细地理解其中让本发明的特征、优点和目标以及其它方面变得显而易见的方式。但是,应该注意的是,附图仅仅是本发明的优选实施方案,由于可以采用其它等同的有效实施方案,所以不应认为是对本发明范围的限制。
图1是将本发明的化学化合物注入到储层的简易流程图;和
图2是可用于本发明一个实施方案的装备的简易流程图,包括将产生的水和本发明的化学组合物一起注入到油井中。
具体实施方式
为了简化附图,在图1和图2中,对于在每幅图中功能相同的流和装备采用相同的附图标记,其中所述功能是相对于所述流或装备而言的。相似的附图标记在全部附图中是指相似的元素,一级标注、二级标注和三级标注在使用时通常在替换性实施方案中表示相似的元素。
醇通常可以定义成R-OH,其中R是碳和氢原子的组合,水被排除在这种定义之外。本发明的优选醇是直链的(和芳族不同),具有1-8个碳长度的碳原子连续链。饱和醇由于往往比不饱和醇稳定,所以通常优选。优选甲醇、乙醇、异丙醇、正丙醇和丁醇。特别优选丙醇。在丙醇中,特别优选异丙醇。利用甲醇、乙醇、丙醇和/或丁醇的化合物构成本发明的醇也在本发明的范围之内。优选乙醇和丙醇的混合物。由于醇分子的化学性质由官能团OH支配,所以本领域技术人员应该理解单独其它醇或组合也能够有效。但是,仅仅采用有1-8连续碳链的一种醇,或者仅仅采用一种由1碳醇-8碳醇(没有其它醇)混合而成的醇,是有效的并且优选的。
值得一提的是,醇也可以就地形成,例如通过在水存在的条件下由盐和合适试剂的反应形成。就地形成醇也在本发明的构思之内。
另外,可以在化学组合物中加入表面活性剂,以减少水-油的界面张力和提高效率,但是本发明通过采用仅仅由氨化合物、醇和载体溶液组成的混合物来提供有效的、成本有效的结果。
在化学组合物中加入氨。氨可以以许多形式提供,优选形式是无水氨和氢氧化铵。氨可以通过反应或者分解来制备。铵例子比如溶解的铵盐也在本发明的构思内。氨在水中具有相当的溶解度,在1体积溶剂中溶解大约700体积。溶解过程通过NH3+H2O的反应得以实现,由此形成NH4 ++OH-。这称作氢氧化铵。所以,在本发明的术语氨中包括了氢氧化铵,它在工业上通常通过将大量氨置于水中制备。本发明还包括了其它原位形成铵离子的前体。
异丙基醇,也称作异丙醇,通式为C3H8O,是不饱和的。对于本发明的醇而言,这是特别优选的。应该注意的是,异丙醇的沸点为82.4℃,在20℃的比重为0.78。异丙醇在空气中显示气味的阈值浓度为每百万份(ppm)空气的22份。异丙醇和空气之间接触偶尔会形成过氧化物,它无论是添加的还是原位形成的,都是所述组合物的另一种可能出现的成分(element)。所以,本发明的替换性实施方案包括向氨化合物和醇中加入过氧化物。异丙醇据信能够改变层(尤其在断裂基质和岩石基质的界面处)的润湿性。通过改变储层流体的性质,实现了增稠效应(viscocification)。
实施例1:
在本实施例中采用无水氨,Baume26。
异丙醇 无水氨 水
体积% 8 4 88
所得组合物稀释5倍,即1份本发明的组合物和4份稀释剂。水用作稀释剂。也可以采用通过产生的水制备的盐水。将所得组合物在油井中测试,发现显著提高了采油量。
实施例2
测试被记为#1300号测试。下面的表将本发明的化学组合物和原生水进行了比较:
表面粘度 密度 pH
#1300 mPa.s g/cm3
化学组合物 0.79 0.958 11.635
原生水#1 0.83 0.985 9.439
原生水#2 0.78 0.982 9.362
该实施例的测试浓度为0%(模仿原生水)、0.2%、0.5%、1.0%、2.0%、4.0%、6.0%、8.0%、10%、15%、20%和100%。
这些测试的结果表明化学组合物在不同浓度时溶解度都良好。
实施例3:
测试被记为#700号测试。下面的表将本发明的化学组合物和原生水进行了比较:
表面粘度 密度 pH
#700 mPa.s g/cm3
化学组合物 0.83 0.964 11.791
原生水#1 0.83 0.985 9.439
原生水#2 0.78 0.982 9.362
所述化学组合物可以回收和再利用,从而进一步降低成本。化学组合物看起来不和油反应,在岩层中的圈闭量也不大。所以,该化学组合物能够和油/流体分离并循环再用。
尽管所示或描述的本发明仅仅使其部分形式,但显然对本领域技术人员而言本发明并不限于此,而是可以进行各种变化却不偏离本发明的范围。
例如,尽管本发明被描述成可用于三次开采,但是可用于在油井寿命之内的任何时刻来增加产量,包括和二次注水连用。尽管描述的是常规注入装备,但是本发明包括将化学组合物和产油层接触的任何方法。形成化学组合物的各种方法,包括就地形成,都在本发明的构思之内。该化学组合物的与其中已经发现的性能相关的用途也在本发明的构思之内。本发明的方法可用于油井增产处理,比如水堵、固砂、沙石酸化,以及提供采油量的方法比如三次采油。该化学组合物可以注入到产油井中或者与产油井相隔一定距离处,从而驱使烃到达油井中。输送该化学组合物的凝胶或者增粘方法也在本发明的构思之内。
Claims (17)
1、用于采油钻井操作中的化学组合物,该化学组合物包括:
氨化合物,
醇;和
含水载体溶液,所述含水载体溶液的体积足以使得所述含水载体溶液中的氨化合物和醇完全溶解,所述氨化合物和所述醇被大量分布到整个载体流体中。
2、权利要求1的化学组合物,其中所述醇含有大约1-大约6个碳原子,并且是非芳族的。
3、权利要求2的化学组合物,其中所述醇是丙醇。
4、权利要求3的化学组合物,其中所述醇是异丙醇。
5、权利要求2的化学组合物,其中所述醇是丁醇。
6、权利要求2的化学组合物,其中所述醇是乙醇。
7、权利要求2的化学组合物,其中所述醇是甲醇。
8、权利要求1的化学组合物,其中所述载体溶液是水。
9、权利要求1的化学组合物,其中所述载体溶液基本由水组成。
10、权利要求1的化学组合物,其中所述氨化合物是氨。
11、权利要求1的化学组合物,其中所述氨化合物是氢氧化铵。
12、权利要求1的化学组合物,其中所述醇的量为所述化学组合物的大约4-16体积%。
13、权利要求1的化学组合物,其中所述氨化合物的量是所述化学组合物的大约2-8体积%。
14、权利要求1的化学组合物,其中所述载体溶液的量是所述化学组合物的大约76-94体积%。
15、权利要求1的化学组合物,其中所述醇和氨化合物限定了醇与氨化合物的比值,所述醇和氨的比值为大约1∶1-大约3∶1,所述比值基于体积。
16、用于从含有烃储量的烃岩层中开采烃的方法,所述方法包括以下步骤:
将权利要求1的化学组合物引入到烃岩层中,引入量足以使得该化学组合物当加入到岩层中时显著提高来自所述储量的采烃量;和从所述烃岩层中开采烃。
17、权利要求16的采烃方法,进一步包括以下步骤:在将化学组合物引入到烃岩层之后,回收大量的所述化学组合物,以使所述化学组合物可以再次用于所述烃岩层中。
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