CN1235626A - 油井加注液 - Google Patents

油井加注液 Download PDF

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Publication number
CN1235626A
CN1235626A CN97197486.1A CN97197486A CN1235626A CN 1235626 A CN1235626 A CN 1235626A CN 97197486 A CN97197486 A CN 97197486A CN 1235626 A CN1235626 A CN 1235626A
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solution
well servicing
servicing fluids
density
tripotassium citrate
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J·A·C·范奥云
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VERDUT BV
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VERDUT BV
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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
    • C09K8/04—Aqueous well-drilling compositions
    • C09K8/06—Clay-free compositions

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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)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

本发明涉及一种含有甲酸钾溶液的含水油井加注液,其特征在于该溶液中含有附加的柠檬酸钾。该柠檬酸钾可作为固体加入甲酸钾溶液中,可提高该溶液的密度,并最大限度降低若加入固体甲酸钾可能发生的结块危险。

Description

油井加注液
本发明是关于提高油井加注液密度的组合物及其制备方法。
众所周知，含水的介质，特别是那些含有油田卤水的介质通常被用作油井加注液，比如钻井泥浆，完井液，充填液，油井处理液，地下地层测试液，隔离液和井洞废弃液。对所有这些应用来说，这种卤水希望有相对高的密度。为达到这一点，不同的组分被添加到这种液体中。这样的添加剂的实例包括了重卤水，比如溴化锌或由它与亲水的高聚物材料，比如羟乙基纤维素联合使用。现时采用的卤水的问题之一是含有锌原子，它是对环境不利的。而且在含有多价金属的水溶性盐的含水体系中羟乙基纤维素的水化性，溶剂化和可分散性都差。为克服其毒性问题，已推荐使用无毒的羧酸盐。其中最重要的是羧酸钾，特别是甲酸钾和乙酸钾。然而像甲酸钾这类盐的问题之一是容易产生结块。如果是企图将固体甲酸钾运至井场，并在现场配制油井加注液是特别不合适的，不论是配制所需密度的新鲜溶液还是为了重复使用而来增强使用过的/贫化了油井加注液的密度。使用通常的抗结块剂不是对油井加注液的密度，就是对加注液的其他成分，对环境或对污染所回收的油方面有负面的影响。
本发明的目的是设计一种组合物，它能提供所需高密度的含水卤水体系，具有很低的生态毒性，而且克服当使用像甲酸钾这类化合物作为密度增强剂时所遇到的结块问题。
因此，本发明是一种含有甲酸钾溶液的含水油井加注液，其特点是在所说的溶液中含有添加的柠檬酸钾。
甲酸钾和柠檬酸钾两者都是容易得到的商品。本发明的特色是当用作油井加注液时，固体柠檬酸钾可被加到甲酸钾的水溶液中以增强其密度。这是特别重要的，因为理论上固体甲酸钾本身可被加到这种溶液中以实现密度的等效增加，但从固体甲酸钾易于结块来看，操作起来更困难得多。相对而言，柠檬酸钾很不容易结块，因此，在使用现场调整油井加注液的密度就很容易操作。这样，当甲酸钾溶液与柠檬酸钾混合时，对甲酸钾溶液的密度实际上是没有负面的影响，相反，甲酸钾溶液的密度被加强了。这是非常令人惊奇的，因为，同样的甲酸钾溶液当与同样量的醋酸钾或甲酸钾混合时导致了甲酸钾溶液密度的降低。
被加入甲酸钾溶液中的柠檬酸钾的量可在很宽的范围内变动，因为在这样宽的范围内它们是可以混合的，但以5～30重量％为合适，10～25重量％更好。
还可任选甲酸铯、醋酸铯、丙酸铯、草酸铯、乳酸铯、柠檬酸铯和酒石酸铯之类的盐加到用于油井加注液的卤水中。通过改变液体中羧酸盐的浓度就可以使卤水或在其中使用卤水的最终的油井加注液达到所需的密度。含有上述羧酸和羟基羧酸盐的制剂是最适合用于加强密度的，因为它们是环境安全，对使用者无害的。
因此，使用本发明的组合物可以达到的密度范围为1.62～2.63克/厘米3，优选的范围为1.8～2.5克/厘米3。
可用混合各别盐的水溶液来制备本发明的油井加注液。其他的办法是，先制备各别碱金属碱的水溶液混合物，在其中加入合适的羧酸以生成各别的羧酸盐。这样形成的水溶液中各别盐所希望的浓度可用从混合溶液中蒸去水的办法来调节。
参照下列的实例进一步阐明本发明。实例
制备一70重量％甲酸钾在水中的对照溶液，并在该溶液(密度1.58)中加入其他的盐(每种10重量％)以测定加入盐对加成溶液的密度影响。所有的实验在室温下进行。这些实验的结果列于下表：
     添加剂                           溶液密度
  不加(对照溶液)                        1.58
  甲酸钾                                1.60
  醋酸钾                                1.53
  柠檬酸钾                              1.60
  甲酸钠                                1.52
上列结果表明甲酸钾和柠檬酸钾是相容的，而且增强了含有两者的溶液密度。当进一步加入甲酸钾时，似也可给出与加入柠檬酸钾所达到的相似的密度，但由于它的结块性，在钻井现场加固体甲酸钾是不方便的。

Claims (5)

1．一种含有甲酸钾溶液的含水油井加注液，其特征在于该溶液中含有附加的柠檬酸钾。
2．一种根据权利要求1的含水油井加注液，其中柠檬酸钾提高了该溶液的密度。
3．一种根据任一前述权利要求的含水油井加注液，其中加到甲酸钾溶液中的柠檬酸钾的量为该溶液中甲酸钾和柠檬酸钾总重量的5～30％。
4．一种根据任一前述权利要求的含水油井加注液，在该溶液中还任选含有添加一种或几种选自以下的盐：甲酸铯、醋酸铯、丙酸铯、草酸铯、乳酸铯、柠檬酸铯和酒石酸铯。
5．一种根据任一前述权利要求的含水油井加注液，其中通过改变甲酸钾与柠檬酸钾的相对浓度来达到溶液具有1.6～2.63克/厘米3的密度。
CN97197486.1A 1996-08-27 1997-08-19 油井加注液 Pending CN1235626A (zh)

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GBGB9617834.8A GB9617834D0 (en) 1996-08-27 1996-08-27 Well servicing fluids
GB9617834.8 1996-08-27

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CN1235626A true CN1235626A (zh) 1999-11-17

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US (1) US6017856A (zh)
EP (1) EP0922079B1 (zh)
CN (1) CN1235626A (zh)
AU (1) AU4027897A (zh)
GB (1) GB9617834D0 (zh)
NO (1) NO990908D0 (zh)
WO (1) WO1998008914A1 (zh)

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US20050101490A1 (en) * 2003-11-11 2005-05-12 Vollmer Daniel P. Cellulosic suspensions of alkali formate and method of using the same
US20050101491A1 (en) * 2003-11-11 2005-05-12 Vollmer Daniel P. Cellulosic suspensions employing alkali formate brines as carrier liquid
DE102015224469A1 (de) * 2015-12-07 2017-06-08 Addcon Europe Gmbh Hochdichte Bohrlochflüssigkeiten mit niedrigen Kristallisationstemperaturen
ES2825223A1 (es) * 2019-11-14 2021-05-14 Siemens Gamesa Renewable Energy As Formulación para aumentar la densidad de líquidos para usos industriales
US20240167531A1 (en) * 2019-11-14 2024-05-23 Siemens Gamesa Renewable Energy A/S Damper for a wind turbine

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US4536297A (en) * 1982-01-28 1985-08-20 Halliburton Company Well drilling and completion fluid composition
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GB9617834D0 (en) 1996-10-09
NO990908L (no) 1999-02-25
EP0922079A1 (en) 1999-06-16
EP0922079B1 (en) 2000-05-24
WO1998008914A1 (en) 1998-03-05
NO990908D0 (no) 1999-02-25
AU4027897A (en) 1998-03-19
US6017856A (en) 2000-01-25

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