PEM钻井废液液相循环利用研究
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摘要
CaCl_2/NaOH共沉淀作用是实现PEM钻井废液固、液相分离的主要机理。本文优化了PEM钻井废液处理过程中CaCl_2/NaOH的使用比例。结果表明,当固定CaCl_2(NaOH)加量时(浓度足够大),随着NaOH(CaCl_2)浓度的增加钻井废液中固、液分离效果越好。优化的NaOH与CaCl_2的使用浓度分别为5970和8955mg·L~(-1),其中Ca~(2+)/OH~-摩尔浓度为1∶1.86,接近Ca(OH)_2中Ca~(2+)与OH~-的比例(1∶2)。考察了上清液对钻井液性能的影响。结果表明,相对于单纯使用处理液配制的钻井液性能,使用海水和处理液等比例混合后配制的钻井液热滚前性能相对较好,热滚后性能变化不大,静切力值略有降低,塑性粘度下降,屈服值略微降低,基本能满足现场循环使用的作业要求。
CaCl_2/NaOHcoprecipitation is the main mechanism for solid-liquid separation(SLS)of waste drilling fluids(WDF).In this paper,the ratio of CaCl_2/NaOH used in the treatment of PEM WDF was optimized.The result shown that when the concentration of CaCl_2(NaOH)was fixed with enough concentration,theSLSresult will be enhanced with the increase of NaOH(CaCl_2)concentration.The optimum concentration of NaOH and CaCl_2were 5970mg·L~(-1)and 8955mg·L~(-1)respectively,and the molar ratio of Ca~(2+)to OH~-was 1∶1.86 which was approaching the ratio(1∶2)of Ca~(2+)to OH~-in Ca(OH)_2.The influence of the separated liquid on the performance of drilling fluid was investigated.The results shown that the performance of the fresh drilling fluid prepared by mixing seawater andseparated liquid in equal proportion was better than that of the drilling fluid prepared by usingseparated liquid only.The performance of the drilling fluid prepared by mixing seawater andseparated liquid changed a little bit after rolling at 80℃for 16h.Tthe static shear force value,the plastic viscosity value and the yield value was slightly reduced.The drilling fluid prepared by mixing seawater and separated liquid in equal proportion can basically meet the operation requirements of field recycling.
CaCl_2/NaOHcoprecipitation is the main mechanism for solid-liquid separation(SLS)of waste drilling fluids(WDF).In this paper,the ratio of CaCl_2/NaOH used in the treatment of PEM WDF was optimized.The result shown that when the concentration of CaCl_2(NaOH)was fixed with enough concentration,theSLSresult will be enhanced with the increase of NaOH(CaCl_2)concentration.The optimum concentration of NaOH and CaCl_2were 5970mg·L~(-1)and 8955mg·L~(-1)respectively,and the molar ratio of Ca~(2+)to OH~-was 1∶1.86 which was approaching the ratio(1∶2)of Ca~(2+)to OH~-in Ca(OH)_2.The influence of the separated liquid on the performance of drilling fluid was investigated.The results shown that the performance of the fresh drilling fluid prepared by mixing seawater andseparated liquid in equal proportion was better than that of the drilling fluid prepared by usingseparated liquid only.The performance of the drilling fluid prepared by mixing seawater andseparated liquid changed a little bit after rolling at 80℃for 16h.Tthe static shear force value,the plastic viscosity value and the yield value was slightly reduced.The drilling fluid prepared by mixing seawater and separated liquid in equal proportion can basically meet the operation requirements of field recycling.
引文
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[2]刘宇程,刘骞,吴东海,等.新疆油田聚磺钻井废液固化处理技术[J].石油与天然气化工, 2017, 46(5):106-112.
[3]周建良,岳前升,杨立平,等.海上油田废弃钻井液固液分离技术研究[J].石油天然气学报, 2012, 34(9):148-151.
[4]侯博,杨勇平,孙欢.废弃钻井液微生物-固化复合处理技术研究[J].应用化工, 2017, 46(11):2191-2194.
[5]张瑶瑶,侯影飞,齐升东,等.油基钻屑微波热处理技术研究进展[J].石油石化节能, 2017, 7(11):19-22.
[6]吕鹏,陈缘博,王秀平,等.不同预处理法对PEM钻井废液固-液分离影响研究[J].化学工程师, 2019,(6):51-54.
[7]沈裕盛,唐明亮,沈晓冬.水泥浆体中氢氧化钙晶体的生长习性[J].硅酸盐学报, 2016, 44(2):232-238.
[8]仲维卓,于锡铃,罗豪甦,等. KDP晶体生长基元与形成机理[J].中国科学E辑:技术科学, 1998, 28(4):320-324.
[9]李汶军,施尔畏.离子晶体生长机理及其生长习性[J].人工晶体学报, 2001, 30(3):232-241.