CN101511968B - 分散剂包覆的增重剂 - Google Patents
分散剂包覆的增重剂 Download PDFInfo
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- CN101511968B CN101511968B CN200780033635.XA CN200780033635A CN101511968B CN 101511968 B CN101511968 B CN 101511968B CN 200780033635 A CN200780033635 A CN 200780033635A CN 101511968 B CN101511968 B CN 101511968B
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Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
- C09K8/032—Inorganic additives
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/16—Clay-containing compositions characterised by the inorganic compounds other than clay
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/32—Non-aqueous well-drilling compositions, e.g. oil-based
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/18—Bridging agents, i.e. particles for temporarily filling the pores of a formation; Graded salts
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Inorganic Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Lubricants (AREA)
- Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)
- Silicates, Zeolites, And Molecular Sieves (AREA)
- Colloid Chemistry (AREA)
- Disintegrating Or Milling (AREA)
- Pigments, Carbon Blacks, Or Wood Stains (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
本发明公开了一种配制井眼液的方法,所述方法包括提供基液;以及添加包覆有分散剂的分级增重剂,所述包覆有分散剂的分级增重剂是通过以下方法制备的:将增重剂和分散剂干混以形成包覆有所述分散剂的分级增重剂。
Description
相关申请的交叉引用
本国际申请要求2007年4月27日提交的美国专利申请11/741,199的权益,该美国专利申请要求2006年9月11日提交的美国临时专利申请60/825,156的权益,该美国临时专利申请的内容通过引用结合在此。
技术领域
本发明总体上涉及流体和用于井眼液的表面包覆的固体材料。
背景技术
当在地层中钻井或完井时,由于各种原因,通常在井中使用各种流体。井液的一般用途包括:在普通钻井或钻开(即,钻开目标含油地层)时润滑和冷却钻头切削表面;将“岩屑”(由于钻头上的齿的切削作用而移除的地层片)运输到地表上;控制地层流体压力以防止喷出;保持井稳定性;将固体悬浮于井中;将钻井地层中的滤失最小化,并且稳定钻井通过的地层;将井附近的地层压裂;用另一种流体代替井内的流体;将井进行清洗;对井进行测试;将水马力传递到钻头上;将流体用于安置封隔器,废弃井或者准备废弃井,以及另外用于对井或地层进行处理。
通常,钻井液应当可在压力下向下泵送,通过钻管柱,然后通过并到达深入地层的钻头头部周围,然后通过在钻杆外部与井壁或套管之间的环状空间返回到地表。除了提供钻井润滑性和效率以及减缓磨损以外,钻井液还应当使固体颗粒悬浮并向地表输送固体颗粒以进行滤砂和处理。此外,该流体应当能够使添加的增重剂(为了增加泥浆的比重)悬浮,并且输送粘土和能够粘附到并覆盖井眼表面的其它物质,所述增重剂通常为磨细的重晶石(硫酸钡矿石)。
钻井液通常具有触变性流体体系的特性。即,当被剪切时,例如当循环时,它们表现出低的粘度(在泵送或与移动钻头接触过程中出现的)。然而,当停止剪切作用时,流体应当能够悬浮其所含的固体以防止重力分离。另外,当钻井液处于剪切条件下并且接近易流动液体时,它必须保持足够高的粘度,以将来自井眼底部的所有多余的粒状物质带到地表上。钻井液配剂还应当允许将岩屑和其它多余的粒状材料移除,或者另外从液体部分中沉降出来。
越来越需要具有能够使这些井的钻井更容易的流变性曲线的钻井液。具有定制的流变性的钻井液确保从井眼中尽可能有效率和有效地移除岩屑,以避免在井中形成岩屑床,这可能导致钻柱被卡住,以及其它的问题。出于钻井液水力学(当量循环密度)观点,还需要降低循环流体所需的压力,这有助于避免将地层暴露于可能压裂地层,导致流体损失并且可能导致井损失的过度压力下。另外,改善的曲线必需防止流体中的加重剂的沉降或下降,如果这种情况发生,可能导致循环流体体系中的不均匀密度曲线,从而可能导致井控(气体/流体注入)和井眼稳定性问题(坍塌/裂纹)。
为了获得满足这些要求所需的流体特性,流体必须容易泵送,因此需要最低量的压力,以迫使它穿过循环流体体系中的限制部分(restriction),例如钻头喷嘴或测井下井仪。或者换言之,在高剪切条件下,流体必须具有可能最低的粘度。相反,在其中流体流动面积大并且流体速度缓慢,或存在低剪切条件的井区中,流体粘度必须尽可能高,以悬浮并且输送钻出的岩屑。这还适用于在流体在井眼中保持静态的时候,其中需要将岩屑和加重料保持悬浮以防止沉降。然而,还应当指出,流体的粘度不应当在静态条件下继续增加至不可接受的水平。另外当需要再次循环流体时,这可能导致可以压裂地层的过度压力,或者换句话说,如果要求收回充分循环流体体系的压力超过泵的限度,它可能导致损失时间。
井眼液还必须对井眼的稳定性有贡献,并且控制来自地层孔隙的气体、油或水的流动,以防止例如地层流体的流出或井喷,或加压的地层的倒塌。井眼内的液柱施加与井眼的深度和流体的密度成正比的静压。高压地层可能需要比重高达3.0的流体。
多种材料目前被用于增加井眼液的密度。这些材料包括溶解的盐,如氯化钠、氯化钙和溴化钙。作为选择,将粉末状的矿物,如重晶石、方解石和赤铁矿加入到流体中以形成密度增加的悬浮液。还已经描述了金属粉末如铁作为钻井液中的增重材料的使用,其中所述增重材料包括直径小于250μm并且优选在15和75μm之间的铁/钢球形颗粒。还已经提出了细粉末状的碳酸钙或碳酸铁的使用;然而,此类流体的塑性粘度随着粒度的减小而快速地增加,从而限制了这些材料的应用。
对于这些井眼液添加剂的一个要求是其形成稳定的悬浮液并且不易于沉降出来。第二个要求是所述悬浮液表现出低粘度,以促进泵送并使高压的产生最小化。最后,井眼液浆液还应当表现出低的滤失量。
常规的增重剂如粉末状的重晶石具有10-30μm的范围内的平均粒子直径(d50)。为了充分地悬浮,这些材料需要加入胶凝剂,如用于水基液的膨润土,或用于油基液的有机改性膨润土。还可以加入可溶性聚合物增粘剂,如黄原胶,以减慢增重剂的沉降速率。然而,随着加入更多的胶凝剂以增加悬浮液稳定性,流体粘度(塑性粘度和/或屈服点)不适宜地增加,从而导致泵送性降低。如果使用增粘剂保持固体悬浮的所需水平,情况也是这样。
微粒增重剂的沉降(或“垂沉”)在以与垂向成大斜度所钻的井眼中变得更加关键,因为例如一英寸(2.54cm)的垂沉可能导致沿井眼壁的上部连续的密度降低的液柱。为了到达例如遥远的储油层部分,通常在大的距离上对这样的大斜度井进行钻井。在这样的情况下,重要的是将钻井液的塑性粘度最小化,以减少在井眼长度上的压力损失。同时,还应当保持高密度,以防止井喷。此外,如上面对微粒增重材料指出,垂沉的问题变得更加重要,以避免微粒增重剂在井眼的低侧的差压卡钻或沉降出来。
能够配制具有高密度和低塑性粘度的钻井液在需要高密度井眼液的深高压井中也是重要的。高粘度可能导致泵送条件下在井眼底部的压力增加。此“当量循环密度”的增加可能导致地层中的张开裂缝和井眼液向压裂的地层的严重损失。再一次,为了保持静压头以避免井喷,悬浮液的稳定性是重要的。具有低粘度和最小的增重材料垂沉的高密度流体的目标仍然是一个挑战。因此,需要增加流体密度、同时提供改善的悬浮稳定性并同时使滤失量和粘度增加最小化的材料。
发明内容
在一个方面中,本发明中所公开的实施方案涉及一种配制井眼液的方法,所述方法包括:提供基液;和加入包覆有分散剂的分级增重剂,所述包覆有分散剂的分级增重剂是通过以下方法制备的:将增重剂和分散剂干混,以形成包覆有该分散剂的分级增重剂。
在另一方面中,本发明中所公开的实施方案涉及一种井眼液,所述井眼液包含:基液;以及通过以下方法制备的包覆有分散剂的分级增重剂:将增重剂和分散剂干混,以形成包覆有分散剂的分级增重剂。
从以下描述和后附的权利要求中,本发明的其它方面和优点将变得明显。
附图说明
图1显示根据本发明中所公开的一个实施方案的干混方法的流程图。
具体实施方式
在一个方面中,本发明中所公开的实施方案涉及用于井眼液的增重剂上的分散剂包覆层。在另一方面中,本发明中所公开的实施方案涉及包含分散剂包覆的增重剂的井眼液的制剂。
在一个实施方案中,可以通过干混方法用分散剂包覆增重剂。可以将所得到的包覆增重剂加入到新的钻井液制剂或加入到已有的制剂。术语“干混”是指其中在不存在溶剂的情况下,将增重剂与分散剂混合并用分散剂包覆的方法。在已转让给本申请的受让人的美国专利申请20040127366中公开了在溶剂的存在下产生胶态的包覆颗粒的类似方法,该专利申请通过引用结合在此。如在本发明中所使用的,术语“分级的增重剂”表示粒度分布降低到低于常规的API规定分布的增重剂。最后,本领域的技术人员应认识到可以在粉碎法(研磨)过程中或通过其它方法,例如热脱附(thermal desorption)将增重剂与分散剂干混。
增重剂
在本发明所公开的实施方案中使用的增重剂可以包括本领域技术人员所熟知的各种化合物。在一个具体实施方案中,增重剂可以选自包括以下物质的材料:例如,硫酸钡(重晶石)、碳酸钙、白云石、钛铁矿、赤铁矿、橄榄石、菱铁矿、氧化锰和硫酸锶。本领域的普通技术人员应认识到具体材料的选择可以主要取决于材料的密度,如典型地,在任何特定密度下的最低井眼液粘度是通过使用最高密度的颗粒获得的。然而,其它的考虑可以影响产品的选择,如成本、本地可得性、研磨所需功率,以及残留的固体或滤饼是否可以从井中容易地被去除。
在一个实施方案中,增重剂可以是具有在1至25μm的范围内的d90和在0.5至10μm的范围内的d50的分级增重剂。在另一个实施方案中,分级的增重剂包括具有在2至8μm的范围内的d90和在0.5至4μm的范围内的d50的颗粒。本领域的普通技术人员应认识到,根据分级技术,增重剂可以具有不同于单峰分布的粒度分布。也就是说,增重剂可以具有在各个实施方案中可以是单峰、双峰或多峰的粒度分布,该单峰分布可以是或可以不是高斯分布。
在转让给本申请的受让人的美国专利申请20050277553中已公开了分级的增重剂的使用,该专利申请通过引用结合在此。可以通过数种方法获得具有这些尺寸分布的颗粒。例如,可以商购分级的颗粒,如具有与本发明中公开的类似粒径分布的合适的重晶石产品。可以获得更粗的研磨的合适材料,并且可以通过任何已知技术将该材料进一步研磨到所需粒度。此类技术包括:喷射研磨、高性能干磨技术、或者本领域中已知通常用于研磨粉末状产品的任何其它技术。在一个实施方案中,可以从常规的重晶石研磨设备的产品流中选择性地移除适当分级的重晶石颗粒,这可以包括从常规的API重晶石研磨操作中选择性地移除细粒(fines)。细粒通常被认为是研磨处理的副产品,并且常规地,将这些材料与较粗的材料共混,以获得API等级的重晶石。然而,根据本公开,可以通过空气分级器将这些副产品细粒进一步处理,以获得在本发明中所公开的粒度分布。在另一个实施方案中,可以通过化学沉淀形成分级的增重剂。此类沉淀的产物可以被单独使用或与机械研磨的产物组合使用。
分散剂
在一个实施方案中,分散剂可以选自分子量为至少150道尔顿的羧酸,如油酸和多元脂肪酸、烷基苯磺酸、烷基磺酸、直链α-烯基磺酸、磷脂如卵磷脂,包括它们的盐并包括它们的混合物。例如,还可以使用合成聚合物,例如HYPERMER OM-1(Imperial Chemical Industries,PLC,英国伦敦)或聚丙烯酸酯。此类聚丙烯酸酯可以包括甲基丙烯酸十八酯和/或丙烯酸丁酯的聚合物。在另一个实施方案中,可以使用相应的酸甲基丙烯酸和/或丙烯酸。本领域的技术人员应认识到可以使用其它丙烯酸酯或其它不饱和羧酸单体(或其酯),以获得与在本发明中所公开的基本上相同的结果。
当将该添加剂用于水基液中时,在一个具体实施方案中,可以使用分子量为至少2000道尔顿的水溶性聚合物。此类水溶性聚合物的实例可以包括选自以下化合物的任何单体的均聚物或共聚物:丙烯酸、衣康酸、马来酸或马来酸酐、丙烯酸羟丙酯乙烯基磺酸、丙烯酰胺基2-丙磺酸、丙烯酰胺、苯乙烯磺酸、丙烯酸类磷酸酯(acrylic phosphate ester)、甲基乙烯基醚和醋酸乙烯酯、或它们的盐。
在一个实施方案中,聚合物分散剂可以具有约10,000道尔顿至约300,000道尔顿的平均分子量,在另一个实施方案中,聚合物分散剂可以具有约17,000道尔顿至约40,000道尔顿的平均分子量,在又一实施方案中,聚合物分散剂可以具有约200,000-300,000道尔顿的平均分子量。本领域的普通技术人员应认识到,当在研磨处理的过程中将分散剂加到增重剂中时,可以使用中间分子量聚合物(10,000-300,000道尔顿)。
此外,特别在本发明所公开的实施方案的范围内的是,在本发明所公开的干混方法之前或与同时将聚合物分散剂聚合。此类聚合可以涉及例如,热聚合、催化聚合或其组合。
包覆方法
可以在基本上没有溶剂的干混方法中进行分散剂对增重剂的包覆。参照图1,示出了用于制备包覆的增重剂的一个实施方案。该方法包括将增重剂10和分散剂12以所需比率共混,以形成共混的材料。在一个实施方案中,增重剂10可以是最初未分级的,并依靠共混方法将颗粒研磨到如上公开的所需尺寸范围。作为选择,该方法可以以分级的增重剂开始。然后可以将共混的材料14进料至热交换系统16,如热脱附系统。可以使用混合器18,如螺旋输送器使混合物前进通过热交换器。通过冷却,聚合物可以保持与增重剂结合。然后可以将聚合物/增重剂混合物20分离为聚合物包覆的增重剂22、未结合的聚合物24、和可能形成的任何团聚体26。如果需要,可以任选地将未结合的聚合物24再循环到该工艺的开始处。在另一个实施方案中,在不加热的情况下,单独的干混方法可以用来包覆增重剂。
作为选择,在没有干混处理的情况下,可以通过如上所述的热吸附包覆分级的增重剂。在此实施方案中,用于制备被包覆的载体(substrate)的方法可以包括:将分级的增重剂加热至足以使如上所述的单体分散剂在增重剂上反应的温度,以形成聚合物包覆的分级增重剂,以及回收聚合物包覆的增重剂。在另一个实施方案中,可以使用催化方法,以在分级的增重剂的存在下形成聚合物。在又一实施方案中,聚合物可以预先形成,并可以被热吸附到分级的增重剂上。
根据又一实施方案,在研磨处理的过程中将分散剂包覆到增重剂上。也就是说,在相对高浓度的分散剂的存在下将粗大的增重剂研磨,使得新形成的细粒的表面暴露于分散剂中,从而被分散剂包覆。据推测,这允许分散剂在颗粒表面上找到可接受的构造,从而包覆表面。作为选择,据推测,因为与在钻井液中相反,在研磨流体中的分散剂浓度相对更高,所以分散剂更有可能被吸附(物理地或化学地)到颗粒表面。如该术语在本发明中所使用的,“表面的包覆”意在表示足够数目的分散剂分子被吸附(物理地或化学地)或另外与颗粒的表面紧密地结合,使得材料的细粒不导致在现有技术中观察到的粘度的快速上升。通过使用这样的定义,本领域的技术人员应当理解并认识到分散剂分子实际上可能没有完全覆盖颗粒表面,并且分子数目的量化是极困难的。
本领域的普通技术人员应认识到可以通过例如喷雾干燥和热脱附的方法,由油基浆液得到干法包覆的颗粒。
在一个实施方案中,分散剂可以占分散剂和增重剂的总质量的约1%至约10%。
在井眼制剂中的应用
根据一个实施方案,可以将干法包覆的增重剂用于井眼液制剂中。所述井眼液可以是水基液、逆乳液或油基液。
水基井眼液可以具有作为基础溶剂(base solvent)的水性流体和分散剂包覆的增重剂。水性流体可以包括淡水、海水、盐水、水和水溶性有机化合物的混合物,以及它们的混合物中的至少一种。例如,可以用所需的盐在淡水中的混合物配制水性流体。这样的盐可以包括但不限于,例如碱金属氯化物、氢氧化物或羧酸盐。在本文中公开的钻井液的各种实施方案中,所述盐水可以包括海水、其中盐浓度低于海水的盐浓度的水溶液,或其中盐浓度高于海水的盐浓度的水溶液。可以在海水中发现的盐包括但不限于,氯化物、溴化物、碳酸盐、碘化物、氯酸盐、溴酸盐、甲酸盐、硝酸盐、氧化物和氟化物的钠、钙、硫、铝、镁、钾、锶、硅、锂和磷盐。可以被混合在给定的盐水中的盐包括,存在于天然海水中的这些盐或任何其它的有机或无机溶解盐的任意一种或多种。另外,可以用于本文中公开的钻井液的盐水可以是天然的或合成的,其中合成盐水在组成上趋于简单得多。在一个实施方案中,钻井液的密度可以通过增加盐水中的盐浓度(至多饱和)来控制。在一个具体实施方案中,盐水可以包括金属例如铯、钾、钙、锌和/或钠的一价或二价阳离子的卤化物或羧酸盐。
油基/逆乳液井眼液可以包含油质连续相、非油质不连续相、和分散体包覆的增重剂。本领域普通技术人员应认识到,可以根据所需应用将上述分散剂包覆的增重剂改性。例如,改性可以包括将分散剂亲水/疏水性化。
油质流体可以是液体,并且更优选为天然的或合成的油,并且更优选所述油质流体选自包括下列的组中:柴油;矿物油;合成油,如包括聚(α-烯烃)、直链和支链烯烃等的氢化和非氢化烯烃、聚二有机硅氧烷、硅氧烷、或有机硅氧烷、脂肪酸酯、特别是脂肪酸的直链、支链和环状烷基醚、其混合物和本领域技术人员已知的类似化合物;以及它们的混合物。油质流体的浓度应当足够,使得逆乳液形成,并且可以少于逆乳液的约99体积%。在一个实施方案中,油质流体的量为逆乳液流体的约30体积%至约95体积%,并且更优选为逆乳液流体的约40体积%至约90体积%。在一个实施方案中,油质流体可以包括至少5体积%的选自以下化合物的材料:酯、醚、缩醛、碳酸二烷基酯、烃及它们的组合。
在本发明中公开的逆乳液流体的制剂中所使用的非油质流体是液体,并且可以是水性液体。在一个实施方案中,非油质液体可以选自包括下列的组中:海水、含有有机和/或无机溶解盐的盐水、含有水混溶性的有机化合物的液体及它们的组合。非油质流体的量典型地小于用于形成逆乳液所需的理论极限。因此,在一个实施方案中,非油质流体的量小于约70体积%,并且优选约1体积%至约70体积%。在另一个实施方案中,非油质流体优选为逆乳液流体的约5体积%至约60体积%。流体相可以包含水性流体或油质流体,或它们的混合物。在一个具体实施方案中,可以将包覆的重晶石或其它增重剂包括在包含水性流体的井眼液中,所述水性流体包括淡水、海水、盐水、及它们的组合中的至少一种。
本发明中公开的流体在地下油井和气井的钻井、完井和修井中是特别有用的。具体而言,本发明中公开的流体可以找到配制允许容易并快速地去除滤饼的钻井泥浆和完井液方面的应用。此类泥浆和流体对于向含烃地层中钻水平井特别有用。
可以使用常规方法以与通常用于制备常规的水基和油基钻井液的方式类似的方式制备本发明中公开的钻井液。在一个实施方案中,将所需量的水基液和适量的分散剂包覆的增重剂混合在一起,并且在连续混合的情况下依次加入钻井液的其余组分。在另一个实施方案中,将所需量的油质流体如基础油、非油质流体和适量的分散剂包覆的增重剂混合到一起,并且在连续混合的情况下依次加入其余的组分。逆乳液可以通过剧烈搅拌、混合或剪切油质流体和非油质流体而形成。
可以被包含在本发明中公开的井眼液中的其它添加剂包括例如,湿润剂、亲有机性粘土、增粘剂、滤失控制剂、表面活性剂、分散剂、界面张力降低剂、pH缓冲剂、互溶剂、稀释剂、冲淡剂和清洁剂。对于配制钻井液和泥浆的本领域普通技术人员,这样的试剂的加入应当是熟知的。
在又一实施方案中,可以用分散剂包覆的增重剂将现有钻井液制剂改性。例如,可以将本公开的分散剂包覆的增重剂加入美国专利申请20040127366(‘366申请)中公开的井眼液,该申请已转让给本申请的受让人。‘366申请的井眼液包含在溶剂存在下由共混方法获得的胶态的包覆增重剂颗粒。此外,普通技术人员应认识到,术语“胶态的”是指颗粒的悬浮,并且不给予任何具体尺寸限制。相反,本公开的微粒化增重剂的尺寸可以在范围内变化,并仅受到本申请的权利要求的限制。然而,本领域的普通技术人员应认识到,可以将本公开的分散剂包覆的增重剂加入任何类型的现有井眼液制剂中。
实施例
以下实施例包括示例性的包覆的和未包覆的增重剂以及显示其滤失量和流变性的实验数据。使用聚丙烯酸酯聚合物包覆的重晶石作为增重材料,在12.5-22.0ppg的泥浆重量范围和250-350°F的温度内,对油基钻井液进行测试。
实施例1
使用高度氢化的矿物油EDC 99DW(M-I LLC,休斯顿,德克萨斯州)作为油质相配制14磅/加仑(ppg)的流体。为了对比,使用分散剂包覆的重晶石和未包覆的重晶石配制14ppg的溶液。如在下面的表1(EMUL HTTM和TRUVISTM各自可从M-I LLC,休斯顿,德克萨斯州得到)中所示,将每种组分的量以磅/桶(ppb)表示。
表1.14ppg流体制剂
产品 | 目的 | ppb |
EDC 99DW | 基础油 | 152 |
重晶石 | 密度 | 354 |
EMUL HTTM | 乳化剂 | 7 |
TRUVISTM | 增粘剂 | 4 |
石灰 | 碱度 | 6 |
CaCl2盐水 | 盐水 | 65 |
将14ppg钻井液中的聚丙烯酸酯聚合物包覆的重晶石和未包覆的重晶石配制成80/20的油/水比率(OWR),并在250°F陈化16小时。流变性是使用可从Fann Instrument Company得到的Fann Model 35粘度计测定的。滤失量是使用饱和的API高温高压(HTHP)池测量的。根据API Bulletin RP1313-2,1990中的方法,通过以磅/100平方英寸计的10分钟胶凝强度评价胶凝强度(即,流体的悬浮特性或触变性的量度)。通过“钻井液和完井液的组成与性能(Composition and Properties of Drilling and CompletionFluids)”第五版,H.C.H.Darley,George R.Gray,1988,第116页中所描述的试验,测量乳液的电稳定性(ES)。结果显示在下面的表2中。
表2.14ppg流体性能
结果表明,使用提供更低的屈服点(YP)、低剪切速率粘度和胶凝强度的包覆重晶石,改善了流变剖面(rheological profile)。当使用包覆的重晶石时,滤失量也显示出改善。
实施例2
根据一个实施方案,可以使用分散剂包覆的增重剂使现有流体制剂增重。以下实验是使用在350°F陈化的16ppg油基液进行的。如在下面的表3(EMUL HTTM、和各自可从M-I LLC,休斯顿,德克萨斯州得到)中所示,将每种组分的量以磅/桶(ppb)表示。
表3.16ppg流体制剂
按上述进行流变性和滤失量测试。静态垂沉测量值由在350°F下的静态条件中将配制的钻井液陈化16小时而得到。本领域的技术人员应认识到此测试方法涉及钻井液在井中为静态时的性能。该测量记录在钻井液柱的顶部所得到的游离油的体积,以及液柱的顶层和液柱的底层的密度。这些密度用于计算静态垂沉因子,其中静态垂沉因子=(顶部SG+底部SG)/底部SG。结果显示在下面的表4中。
表4.增重流体
尽管结果显示相当的流变性,但是干法包覆的重晶石提供更好的静态垂沉和滤失量性能。
实施例3
将20ppg流体配制成90/10的OWR,并在350°F陈化。如在下面的表5(SUREMULTM和VERSATROLTM各自可从M-I LLC,休斯顿,德克萨斯州得到;BENTONE可从N L Industries,纽约,纽约得到)中所示,将每种组分的量以磅/桶(ppb)表示。
表5.20ppg流体制剂
产品 | 目的 | ppb |
EDC99DW | 基础油 | 120 |
重晶石 | 密度 | 676 |
SUREMULTM EH | 乳化剂 | 10 |
BENTONE 150 | 增粘剂 | 0.5 |
BENTONE 42 | 增粘剂 | 1.0 |
VERSATROLTM HT | 滤失 | 2.5 |
石灰 | 碱度 | 6.0 |
CaCl2盐水 | 盐水 | 24 |
按上述进行流变性和滤失量测试。滤失量和流变性测量值显示在下面的表6中。
表6.高密度流体性能
结果表明,干法包覆的重晶石可以被用于配制密度极高而没有通常与之相关的高流变性的钻井液。本领域的普通技术人员应当认识到,困难不仅在于用20ppg流体获得低PV,还在于将细的未包覆增重剂混合和分散/润湿到油基液中方面的相关问题。
实施例4
如在下面的表5中所概括,对重晶石在上述实施例2中描述的16ppg油基液中的混合、润湿和分散性进行测试。
表7.分散/润湿评价
表5中的结果表明,当向配制的钻井液中加入增重材料时,包覆的重晶石易于分散并且在最初的5分钟内获得其最终的流变性,而当加入未包覆的重晶石时,获得其最终的流变性需要长得多的时间。
实施例5
使用DF1作为油质相配制14磅/加仑(ppg)的流体。使用微粒化氧化锰配制三种14ppg流体:含有未包覆的微粒化氧化锰的泥浆、包含未包覆的微粒化氧化锰和分散剂(EMI759,可从M-I LLC,休斯顿,德克萨斯州得到)的钻井泥浆、以及分散剂(EMI759)包覆的氧化锰。氧化锰具有如下粒度分布:d10=0.22微米;d50=0.99微米;d90=2.62微米。在下面的表8中给出了在泥浆制剂中使用的每种组分以ppb表示的量(EMUL HTTM,TRUVISTM,和各自可从M-I LLC,休斯顿,德克萨斯州得到)。
表8.14ppg流体制剂
将上述钻井液配制成80/20的油/水比率(OWR),并在250°F陈化16小时。流变性是使用可从Fann Instrument Company得到的Fann Model 35粘度计测定的。滤失量是使用饱和的API高温高压(HTHP)池测量的。根据API Bulletin RP 1313-2,1990中的方法,通过以磅/100平方英寸计的10分钟胶凝强度评价胶凝强度(即,流体的悬浮特性或触变性的量度)。结果显示在下面的表9中。
表9.14ppg流体性能
结果表明,使用提供更低的屈服点(YP)、低剪切速率粘度和胶凝强度的包覆氧化锰,改善了流变剖面。当使用分散剂包覆的氧化锰时,滤失量也显示出改善。表9中的结果还表明了用分散剂包覆增重剂相对于泥浆制剂中仅包含分散剂的益处。
有利地,当使用分级的增重剂时,包覆的增重材料的益处可以是最佳的。本领域的技术人员应当认识到,可以有在分级的颗粒范围以外实现的益处,但是分级的范围可以使得易于分散材料并且需要较少的钻井液添加剂,如乳化剂和亲有机性粘土以获得所需的流体性能。在较高的泥浆重量(>16ppg),与混合和分散未包覆的重晶石的困难相比,在干法包覆的重晶石被混合和分散到流体中的能力方面可以存在显著的益处。此外,尽管常规流体没有实现在垂沉、流变性和滤失量的每一方面的最佳性能,但是如本发明中所公开的那些流体可以实现这些方面中的每一个的最佳化。此外,因为包覆的增重剂是在干法中形成的,因此其可以在不需要另外增重的情况下使用。
尽管已经对本发明的有限数量的实施方案进行了描述,但是受益于本公开的本领域技术人员应当认识到,可以设计不偏离本申请中公开的本发明范围的其它实施方案。因此,本发明的范围应当仅仅由后附权利要求限制。
Claims (10)
1.一种配制井眼液的方法,所述方法包括:
通过研磨工艺用分散剂干法包覆并磨碎增重剂以形成包覆有分散剂的分级增重剂;
提供基液;以及
将所述包覆有分散剂的分级增重剂添加至基液中,其中所述分级增重剂具有在2至8μm的范围内的d90和具有在0.5至4μm的范围内的d50。
2.权利要求1所述的方法,其中所述增重剂是选自以下物质中的至少一种:重晶石、碳酸钙、白云石、钛铁矿、赤铁矿、橄榄石、菱铁矿、氧化锰和硫酸锶。
3.权利要求1所述的方法,其中所述增重剂在所述干法包覆工艺过程中分级。
4.权利要求1所述的方法,其中所述干法包覆包括将分级增重剂与分散剂干混。
5.权利要求1所述的方法,其中所述分散剂包含选自以下化合物中的至少一种:油酸、多元脂肪酸、烷基苯磺酸、烷基磺酸、直链α烯基磺酸、它们的碱土金属盐和磷脂。
6.权利要求1所述的方法,其中所述分散剂包括聚丙烯酸酯。
7.权利要求6所述的方法,其中所述聚丙烯酸酯是选自甲基丙烯酸十八酯或丙烯酸丁酯的聚合物中的至少一种。
8.权利要求1所述的方法,其中所述基液是选自水基液、油基液、和逆乳液中的一种。
9.权利要求1所述的方法,其中所述井眼液还包含胶态的包覆增重剂。
10.权利要求1所述的方法,其中所述干法包覆包括将所述分散剂热吸附到所述增重剂上。
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