CN100449111C - 用于密封在地层中形成的钻井内的空间的系统和方法 - Google Patents
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Abstract
本发明提供一种密封在地层(2)中形成的钻井(1)内的空间(7)的系统。所述系统包括在钻井中设置的可膨胀体(12),其设置方式当所述可膨胀体膨胀时密封所述空间,所述可膨胀体容易与流入钻井的地层水(4)接触,所述可膨胀体包括提供有可溶于所述地层水的化合物的基质材料。所述基质材料基本上阻止或限制了所述化合物迁移出可膨胀体,并且允许所述地层水通过渗透迁移入所述可膨胀体中,从而在所述地层水迁移入所述可膨胀体时诱导所述可膨胀体膨胀。
Description
本发明涉及用于密封在地层中形成的钻井内的空间的系统和方法,其中所述地层含有易于流入钻井内的地层水。
在由钻井生产烃流体的过程中,通常的作法是在钻井中安装一个或多个管状套管段以稳定钻井并控制流体从周围地层流入钻井内。在通常的应用中,套管段沿向下的方向直径逐步减小,这是由于安装程序的结果,因为各下一个套管段必须通过前面安装的套管段。
已经提出了一些替代的套管方案,其克服了套管直径逐步减小的问题。例如在一个这种替代方案中,通过在前期安装的套管段降低套管段至希望的深度来安装各套管段,从而套管段有一小段重叠部分延伸至前期安装的管段中。接下来所述套管段在钻井中径向膨胀,从而允许具有相对较大直径的钻头的钻井绳从中通过下向突进。当应用相对较大直径的钻头钻深钻井后,另一个套管段向下通过膨胀的套管段。然后重复套管段的膨胀再钻井、向下放入新的套管段的循环。结果得到直径基本均匀一致的钻井。
在常规的钻井构建过程中,所安装的套管段通过在套管和钻井壁间泵送一层水泥而在钻井中固定和密封。这种技术也可用于可膨胀的开孔衬管上。水泥层的密封作用要求防止地层流体如地层水迁移通过套管和钻井间的环形空间。但是有经验表明通过在环形空间中泵送水泥层有时很难实现足够的密封。例如如果用于钻井的钻井流体在环形空间中不能被水泥完全替代,或者如果钻井壁内的不规则性阻止了水泥对环形空间的充分填充,则存在地层流体沿轴向方向迁移通过环形空间的危险。
WO 03/008756公开了密封钻井内的环形空间的一种替代系统,其中在环形空间中设置可膨胀的环形密封材料。根据应用类型,所述密封材料由与油或水接触时易于膨胀的橡胶材料制成。在应用中,当地层流体进入钻井中时,密封材料膨胀,从而密封环形空间并阻止地层流体轴向迁移通过钻井。
与水接触时发生膨胀的材料的例子有:1)聚电解质如超吸收聚合物(SAP),如聚丙烯酸钠和丙烯酸,2)亲水性粘土如钠质膨润土颗粒(如Wyoming膨润土),或3)天然的水膨胀材料如木材、软木或纤维素填料。例如在土建工程应用中应用亲水性弹性体作为隧道垫圈。
虽然当与新鲜(无盐)水接触时上述材料可以得到充足的膨胀结果,但有经验表明当与含盐地层水接触时,由这些材料制成的密封膨胀得不够充分。例如,当水由新鲜水变为含盐水时,在水中浸没的聚丙烯酸钠颗粒和膨润土颗粒的膨胀比率显著降低,特别是当二价阳离子如Ca2+和Mg2+存在时,而对于通常的油田地层的含水层来说这是常见的。在″Modern super absorbent polymer technology″,Buchholz,F.L.and Graham,A.T.,Wiley New York 1998,第57页和图2.16中,综述了在含盐水,特别是含二价阳离子的溶液中,SAP的膨胀比率下降,其中在0.9wt%的NaCl溶液中,随着CaCl2浓度增加,显示交联的聚丙烯酸钠的膨胀能力明显降低。在这里,膨胀比率定义为材料膨胀后的体积与材料膨胀前的体积的比。另外,从它们有限的长期耐受较高温度的角度来看,在盐水溶液中也发生膨胀的亲水性聚氨酯(如Sanyo的Aquaprene C-520、Kuriyama的Aquaquell 8V、Denbi的Hydrotite)被认为并不适用于大多数用途中。
本发明的目的是提供一种改进的密封在地层中形成的钻井内的空间的系统,其克服了现有技术的缺点。
按照本发明,提供一种密封在地层中形成的钻井内的空间的系统,所述系统包括在钻井中设置的可膨胀体,其设置方式当所述可膨胀体膨胀时密封所述空间,所述可膨胀体容易与流入钻井的地层水接触,所述可膨胀体包括提供有可溶于所述地层水的化合物的基质材料,其中所述基质材料基本上阻止或限制了所述化合物迁移出可膨胀体,并且允许所述地层水通过渗透迁移入所述可膨胀体中,从而在所述地层水迁移入所述可膨胀体时诱导所述可膨胀体膨胀。
本发明还涉及一种密封在地层中形成的钻井内的空间的方法,所述方法包括在钻井中设置可膨胀体,其设置方式当所述可膨胀体膨胀时密封所述空间,所述可膨胀体容易与流入钻井的地层水接触,所述可膨胀体包括提供有可溶于所述地层水的化合物的基质材料,其中所述基质材料基本上阻止或限制了所述化合物迁移出可膨胀体,并且允许所述地层水通过渗透迁移入所述可膨胀体中,从而在所述地层水迁移入所述可膨胀体时诱导所述可膨胀体膨胀。
按这种方式实现了可膨胀体的膨胀,以及通过化学渗透密封所述空间,从而基质材料用作对水可渗透但对所述化合物(基本上)不渗透的膜。
为了防止或减少所述化合物从可膨胀材料体中滤出,优选的是所述膨胀体包含对所述化合物或由所述化合物形成的离子基本上不可渗透的基质材料。
基质材料优选包括聚合物基质材料,例如热固性弹性体基质材料或热塑性弹性体基质材料。
在一个优选的实施方案中,通过在大量聚合物材料内混合所述化合物,然后使大量聚合物材料硫化以形成所述聚合物基质材料,由此得到或可以得到聚合物基质材料。例如,化合物由盐颗粒形成,其在交联(硫化)前被混入到大量聚合物材料内,然后通过聚合物材料交联形成弹性体基质材料,在其中包埋了所述盐颗粒。
能够较长时间承受钻井内高温的合适的热固性弹性体材料有:
1)橡胶材料,除了在水中膨胀外,其在油井中存在的原油中也膨胀,例如乙烯丙烯橡胶(EPM和EPDM)、乙烯-丙烯-二烯烃三元聚合物橡胶(EPT)、丁基橡胶(IIR)、溴丁基橡胶(BIIR)、氯丁基橡胶(CIIR)、聚氯乙烯(CM/CPE)、氯丁橡胶(CR)、苯乙烯-丁二烯共聚物橡胶(SBR)、磺化聚乙烯(CSM)、乙烯-丙烯酸酯橡胶(EAM/AEM)、表氯醇-环氧乙烷共聚物(CO、ECO)、硅橡胶(VMQ)和氟硅橡胶(FVMQ);
2)在原油中不膨胀的橡胶材料,如丁二烯-丙烯腈共聚物(丁腈橡胶,NBR)、氢化的NBR(HNBR、HNS)如ZETPOL、TORNAC、TERBAN、具有反应基团的NBR(X-NBR)、氟橡胶(FKM)如VITON、FLUOREL、全氟橡胶(FFKM)如KALRIZ、CHEMRAZ和四氟乙烯/丙烯(TFE/P),如AFLAS,当暴露在油田原油中时其不膨胀。
这种弹性体大多数可以通过一种以上的交联剂来交联(例如″硫交联或过氧化物交联)。
除了上面引述的热固性(非膨胀性和油膨胀性)弹性体基质材料外,也可以应用弹性体的混合物(也称为“弹性体合金”)。虽然几乎所有的热塑性和热固性弹性体的组合都是可以应用的,但最优选的是EPDM/聚丙烯混合物如SARLINK、Levaflex、Santoprene,NBR-聚丙烯混合物如GEOLAST,NBR/聚氯乙烯混合物和NR/聚丙烯混合物。所有这些在石油原油中均有膨胀的顷向,特别是在目标井下钻井温度下。
所述化合物优选结合均匀分布在基质材料中的多个颗粒内。
合适的颗粒为盐的细颗粒,优选为离解盐,其可以均匀地配混入基质橡胶中。例如可以应用在水中可溶的极细的盐颗粒,所述盐选自:乙酸盐,M-(CH3COO);碳酸氢盐,M-(HCO3);碳酸盐,M-(CO3);甲酸盐,M-(HCO2);卤化物,Mx-Hy(H=Cl、Br或I);氢硫化物,M-(HS);氢氧化物,M-(OH);酰亚胺,M-(NH);硝酸盐,M-(NO3);氮化物,M-N;亚硝酸盐,M-(NO2);磷酸盐,M-(PO4);硫化物,M-S;以及硫酸盐,M-(SO4);其中M可以为元素周期表中的任何金属。可以应用阳离子为非金属的其它盐如NH4Cl。
但优选的盐为NaCl和CaCl2。
为了限制从弹性体中滤出盐,可膨胀体适当地包括在聚合物的骨架或侧链基团中含有氧或氮的极性基团的任意亲水性聚合物。这些侧链基团可以部分或完全中和。这种类型的聚合物有亲水性聚合物类如醇、丙烯酸酯、甲基丙烯酸酯、乙酸酯、醛、酮、磺酸盐、酸酐、马来酸酐、腈、丙烯腈、胺、酰胺、氧化物(聚环氧乙烷)、纤维素类,包括这些类型物质的所有衍生物,包括上述所有接枝类变体的所有共聚物。合适地应用一种包括弹性体、极性SAP和盐的三元系统,从而将极性SAP接枝到弹性体的骨架上。这种系统具有如下优点:极性SAP颗粒能够在弹性体基质中保留盐颗粒,从而减少了盐从弹性体中滤出。极性盐通过静电力吸引到极性SAP分子上,其被接枝(粘)到橡胶的骨架上。
可膨胀体通常应该能够在高达140g/氯化钠的盐水中膨胀,并且所述盐水含有相当浓度的二价离子,如至少40g/l的氯化钙和8g/l的氯化镁,并且温度为至少40℃,但是优选为100-150℃,这对于油井静底部孔温度是典型的。从非膨胀向完全膨胀状态转化优选发生在2-3周的时间范围内,并且该膨胀状态应该保持至少一年的时间。
通过实施例并参考附图进一步更为详细地描述本发明,其中:
图1示意性描述了对各种含盐水来说,当在水中浸泡时非本发明材料的膨胀行为;
图2a示意性描述了各种橡胶组合物当在盐水中浸泡时在相对较长时间内的膨胀行为;
图2b示意性描述了图2a的橡胶组合物在相对较短时间内的膨胀行为;
图3示意性描述了含有各种不同浓度盐的橡胶组合物当在盐水中浸泡时的膨胀行为;
图4示意性描述了本发明系统的实施方案,其中在沿延伸入地层中形成的钻井内的套管设置环形密封;和
图5示例性描述了图4的套管和环形密封的侧视图。
在所有附图中,相同的参照标记表示相同的组件。
参考图1,图中描述了对于不同的交联密度(X),在水中浸泡的聚丙烯酸钠的膨胀率与NaCl盐浓度的函数关系,其中
Q=膨胀率
C=水中NaCl的浓度(wt%)
线a:X=0.025wt%聚丙烯酸钠
线b:X=0.04wt%聚丙烯酸钠
线c:X=0.06wt%聚丙烯酸钠
线d:X=0.08wt%聚丙烯酸钠
线e:X=0.10wt%聚丙烯酸钠
从图中可以清楚地看出,通过向橡胶基质材料中加入超吸收聚合物(SAP)颗粒而制备的水膨胀性弹性体不适合于盐性钻井条件。地层蓄水层可能是极度盐性的(在井下温度下饱和),通常为普通海水盐度的4-6倍。特别是通常在油田蓄水层中存在的二价阳离子如Ca2+和Mg2+的存在,使膨胀能力明显降低。这种SAP颗粒可以分为淀粉系统、纤维素系统和合成树脂系统。由于醇、羧酸、酰胺或硫酸的存在,SAP具有亲水特性。由于发生了交联,颗粒具有三维网状结构,从而该材料能够膨胀为其原始体积的至少100倍。由于水解作用的结果其存在内在的不稳定性,所认为其它可能的膨胀聚合物如聚氨酯、聚酯、聚醚等是不适用的。
900-70-1236,由线a′表示
900-70-1354,由线b′表示
900-70-1211,由线c′表示
这些组合物具有作为基础化合物的EPDM橡胶基质材料,可由Bayer,Leverkusen,Germany以商品名Buna EPEPT-5459/6950得到。
另外,这些组合物包括常规的增强剂、填料、硫化剂和稳定剂。
另外:
组合物900-70-1354包含SAP(且无盐);
组合物900-70-1211包括盐和SAP。
从图中可以清楚地看出,组合物900 70-1236在含有相当多量二价离子Ca2+、Mg2+的高盐石油蓄水层盐水中表现出非常好的超过200体积%的膨胀率。组合物900-70-1354具有较差的膨胀性能(约18体积%),而共混组合物900-70-1211具有介于组合物900-70-1354和组合物900-70-1236之间的膨胀性能。
34.8wt%,由线a″表示
26.3wt%,由线b″表示
41.6wt%,由线c″表示
15.1wt%,由线d″表示
在这些组合物中所有其它添加剂保持恒定。
很明显,以基质材料的重量为基准,NaCl颗粒的浓度为32-37wt%时可以得到最佳膨胀率。
在图4和图5中描述了在地层2中形成的钻井1,所述地层包括含盐地层水的地层。在钻井1中设置钻井的套管6,从而在套管6和钻井壁8之间形成环形空间7。在钻井的顶部,即在地面上设置井头10。在相对于地层的钻井部分中,在环形空间7中设置多个环12形式(图中仅示出了一个环12)的环形密封。
如上所述,环12由易于在水中膨胀的一种或多种热固性或热塑性弹性体材料组成。例如,环12由沿套管6延伸的带14形成。各环12的长度通常为0.05-0.5m,并且厚度为0.003-0.07m。在环和套管之间应用粘接剂,以使环12固定在套管6的外表面上,所述粘接剂优选在弹性体材料的硫化过程中仍起作用。另外,环12包含较高浓度(以弹性体为基准至少为20wt%,优选为30-35wt%)的盐颗粒,从而当含盐地层水通过渗透进入弹性体材料时诱导弹性体材料膨胀。在本实施例中盐颗粒为NaCl颗粒,但也可以应用任何较高浓度的单价、二价或三价水溶性盐。
为了在钻井内套管6的安装过程中保护环12,还任选为一组环12配备附加的一个或多个环(″磨损垫″)或套管,其在水中不膨胀,如NBR、HNBR、FKM、XNBR、FFKM、TFE/P橡胶环。这种附加的环应该具有较高的抗磨擦性,并且优选设置在各可膨胀弹性体环12的任一侧。可替代地,这些环可以仅设置在一组环12的端部。
在正常操作过程中,在硫化前将NaCl颗粒混入橡胶基质材料中,所述混合应用合适的模塑设备(图中未示出)进行,例如:a)两个辊压机,b)混砂机,或c)Gordon塑炼机。对于该技术的全面综述,可以参考:
Werner Hofmann,橡胶技术手册(Rubber Technology Handbook),第二版,(1996),Hanser/Gardner Publications,Cincinnati,ISBN1-56990-145-7第五章:弹性体的处理,化合物制备(Processing ofelastomers,′Compound Preparation′)。
然后橡胶基质材料形成带14,其绕套管6的表面径向或轻微螺旋状包裹。在下一步中,橡胶基质材料以及任选的磨擦垫材料,在烤箱中通常在温度为150-180℃下硫化以形成环12。随后套管6向下放入钻井1中,直到环12放置在相对地层的钻井1的所述部分。环12的厚度选择得足够小以不妨碍套管6向下延伸。
当含盐地层水从地层流入钻井1时,含盐地层水与水可膨胀环12接触。由于盐颗粒的盐浓度(纯盐)比地层水本身的盐度要高得多,由于渗透结果会发生地层水渗透入橡胶基质材料中,这将会导致环12膨胀,从而环12将相对钻井壁压紧,从而完全密封环形空间7。以这种方式,阻止了地层水通过环形空间7的任何进一步迁移。
如果需要,套管6可以在钻井中沿径向膨胀,优选在环12发生膨胀之前进行。
在图2a、2b和3中所涉及的所有样品均浸泡在含盐的蓄水层的水(″100%Oman蓄水层水″)中,所述水包含139克/升NaCl、41克/升CaCl2,7.5克/升MgCl2,并且其温度为95℃。
代替在套管上应用环(参考图4和5),在砂网段之间设置的空管的一个或多个区段上也可以应用环,所述砂网例如可膨胀砂网。以这种方式,可以创造独立的砂网流入区,其在油井的寿命期内可以选择性地切断。
在环膨胀之前或之后,优选在环膨胀之前,套管适当地为在钻井中沿径向膨胀的可膨胀套管。
Claims (19)
1.一种密封在地层中形成的钻井内的空间的系统,所述系统包括在钻井中设置的可膨胀体,其设置方式使得所述可膨胀体膨胀时密封所述空间,所述可膨胀体容易与流入钻井的地层水接触,所述可膨胀体包括提供有可溶于所述地层水的化合物的聚合物基质材料,其中所述聚合物基质材料基本上阻止或限制了所述化合物迁移出可膨胀体,并且允许所述地层水通过渗透迁移入所述可膨胀体中,从而在所述地层水迁移入所述可膨胀体时诱导所述可膨胀体膨胀,其特征在于通过在大量聚合物材料中混合所述化合物并随后硫化所述大量聚合物材料而形成所述聚合物基质材料。
2.权利要求1的系统,其中所述基质材料对所述化合物或所述化合物的离子基本上不可渗透。
3.权利要求1的系统,其中所述聚合物基质材料为弹性体基质材料。
4.权利要求3的系统,其中所述弹性体基质材料包括选自如下的橡胶:NBR、HNBR、XNBR、FKM、FFKM、TFE/P或EPDM基础橡胶。
5.权利要求1-4任一项的系统,其中所述化合物以分散在所述基质材料中的多个颗粒的形式存在于所述基质材料中。
6.权利要求5的系统,其中所述颗粒基本均匀地分散在所述基质材料中。
7.权利要求5的系统,其中所述颗粒包埋在所述基质材料中。
8.权利要求1-4任一项的系统,其中所述化合物包括盐。
9.权利要求8的系统,其中所述盐为离解盐。
10.权利要求8的系统,其中所述盐是如下的一种:乙酸盐(M-CH3COO)、碳酸氢盐(M-HCO3)、碳酸盐(M-CO3)、甲酸盐(M-HCO2)、卤化物(Mx-Hy)(H=Cl、Br或I)、氢硫化物(M-HS)、氢氧化物(M-OH)、酰亚胺(M-NH)、硝酸盐(M-NO3)、氮化物(M-N)、亚硝酸盐(M-NO2)、磷酸盐(M-PO4)、硫化物(M-S)和硫酸盐(M-SO4),其中M为选自元素周期表的金属族的金属。
11.权利要求8的系统,其中以基质材料和盐的组合重量为基准,可膨胀体含有至少20wt%的盐。
12.权利要求11的系统,其中以基质材料和盐的组合重量为基准,可膨胀体含有至少35wt%的盐。
13.权利要求1-4任一项的系统,其中所述空间为在延伸入钻井内的管状元件和围绕所述管状元件的基本圆筒状的壁之间形成的环形空间。
14.权利要求13的系统,其中所述管状元件为钻井套管或钻井内衬,并且所述基本圆筒状的壁为钻井壁。
15.权利要求13的系统,其中所述可膨胀体由一个或多个环形成,各环围绕所述管状元件延伸。
16.权利要求1-4任一项的系统,其中在相对含所述地层水的地层的钻井部分设置所述可膨胀体。
17.权利要求1-4任一项的系统,其中所述地层水为含盐地层水。
18.一种密封在地层中形成的钻井内的空间的方法,所述方法包括在钻井中设置可膨胀体,其设置方式当所述可膨胀体膨胀时密封所述空间,所述可膨胀体容易与流入钻井的地层水接触,所述可膨胀体包括提供有可溶于所述地层水的化合物的聚合物基质材料,其中所述聚合物基质材料基本上阻止或限制了所述化合物迁移出可膨胀体,并且允许所述地层水通过渗透迁移入所述可膨胀体中,从而在所述地层水迁移入所述可膨胀体时诱导所述可膨胀体膨胀,其特征在于通过在大量聚合物材料中混合所述化合物并随后硫化所述大量聚合物材料形成所述聚合物基质材料而得到所述聚合物基质材料。
19.权利要求18的方法,其中所述化合物以化合物的多个颗粒的形式混合在大量聚合物材料中。
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- 2004-07-22 BR BRPI0413004A patent/BRPI0413004B1/pt active IP Right Grant
- 2004-07-22 AU AU2004260885A patent/AU2004260885B2/en active Active
- 2004-07-22 MX MXPA06000959A patent/MXPA06000959A/es active IP Right Grant
- 2004-07-22 CN CNB2004800219441A patent/CN100449111C/zh not_active Expired - Fee Related
- 2004-07-22 US US10/566,151 patent/US7527099B2/en active Active
- 2004-07-22 DK DK04766286.1T patent/DK1649136T4/en active
- 2004-07-22 WO PCT/EP2004/051572 patent/WO2005012686A1/en active IP Right Grant
- 2004-07-22 OA OA1200600027A patent/OA13222A/en unknown
- 2004-07-22 NZ NZ544613A patent/NZ544613A/en not_active IP Right Cessation
- 2004-07-22 EA EA200600343A patent/EA008390B1/ru not_active IP Right Cessation
- 2004-07-22 CA CA2533424A patent/CA2533424C/en active Active
- 2004-07-22 EP EP04766286.1A patent/EP1649136B2/en active Active
- 2004-07-28 MY MYPI20043032A patent/MY137502A/en unknown
- 2004-07-28 AR ARP040102674A patent/AR045138A1/es active IP Right Grant
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2006
- 2006-01-28 EG EGNA2006000104 patent/EG24311A/xx active
- 2006-02-03 MA MA28773A patent/MA27978A1/fr unknown
- 2006-02-27 NO NO20060937A patent/NO343768B1/no unknown
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Also Published As
Publication number | Publication date |
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NZ544613A (en) | 2007-11-30 |
AR045138A1 (es) | 2005-10-19 |
AU2004260885B2 (en) | 2007-11-08 |
EP1649136B1 (en) | 2006-10-18 |
US7527099B2 (en) | 2009-05-05 |
BRPI0413004A (pt) | 2006-09-26 |
EA008390B1 (ru) | 2007-04-27 |
OA13222A (en) | 2006-12-13 |
MY137502A (en) | 2009-02-27 |
DK1649136T3 (da) | 2007-02-19 |
BRPI0413004B1 (pt) | 2016-04-19 |
EA200600343A1 (ru) | 2006-06-30 |
DK1649136T4 (en) | 2018-06-06 |
EG24311A (en) | 2009-01-14 |
MA27978A1 (fr) | 2006-07-03 |
NO343768B1 (no) | 2019-06-03 |
AU2004260885A1 (en) | 2005-02-10 |
MXPA06000959A (es) | 2006-03-30 |
NO20060937L (no) | 2006-02-27 |
EP1649136A1 (en) | 2006-04-26 |
EP1649136B2 (en) | 2018-02-28 |
CN1829852A (zh) | 2006-09-06 |
WO2005012686A1 (en) | 2005-02-10 |
CA2533424A1 (en) | 2005-02-10 |
US20070056735A1 (en) | 2007-03-15 |
CA2533424C (en) | 2012-06-12 |
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