压裂返排液中残余硼的去除及返排液的重复利用
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摘要
在重复利用压裂返排液时,未完全降解的残余硼交联剂会影响后续压裂液的配制,残余硼遇碱时会提前交联羟丙基胍胶,致使体系基液黏度增加,降低泵送速率和压裂效果。采用多羟基化合物与硼络合以消除提前交联的不良影响,并考察了反应条件对络合效率及络合物稳定性的影响。实验结果表明,含有顺式邻位羟基的自制甘露醇(GLC)对硼有很好的络合效果,在GLC与硼酸的摩尔比大于等于2.5、pH约为10时,硼能被完全掩蔽形成稳定的络合物。用络合处理后的返排液直接配制交联冻胶压裂液,未出现提前交联的现象,且其流变性能与原始冻胶压裂液的流变性能相当。该方法能去除利用返排液配制压裂液时出现提前交联的不良影响。整个过程不需分离已存在于返排液中的含硼络合物,可提高处理效率。
During recycling flowback fluids,uncompleted degradation of residual boron will affect subsequent preparation of fracturing gels. It premature crosslink hydroxypropyl guar gum(HPG) under alkaline system and increase the viscosity of the system that affects the fracturing effect and pumping rate. By using polyols complex residual boron to eliminate adverse effects of premature crosslinking,the effect of reaction conditions on efficiency and stability was investigated. Results show that a homemade mannitol(GLC) containing cis-hydroxyl groups has good complexation for boron,which can be completely complexed to form stable complexes when the molar ratio of GLC to boric acid excelled 2.5 and pH is around 10. When using masked water direct prepare fracturing gels that do not appear premature crosslinking phenomenon,and its rheological property is similar to the fracturing gels prepared by deionized water. This method removed the adverse effects of premature crosslink HPG when preparing fracturing gels using flowback fluids. Additionally,the whole process does not additional separate existed boron-complexes in flowback fluids that increase processing efficiency.
During recycling flowback fluids,uncompleted degradation of residual boron will affect subsequent preparation of fracturing gels. It premature crosslink hydroxypropyl guar gum(HPG) under alkaline system and increase the viscosity of the system that affects the fracturing effect and pumping rate. By using polyols complex residual boron to eliminate adverse effects of premature crosslinking,the effect of reaction conditions on efficiency and stability was investigated. Results show that a homemade mannitol(GLC) containing cis-hydroxyl groups has good complexation for boron,which can be completely complexed to form stable complexes when the molar ratio of GLC to boric acid excelled 2.5 and pH is around 10. When using masked water direct prepare fracturing gels that do not appear premature crosslinking phenomenon,and its rheological property is similar to the fracturing gels prepared by deionized water. This method removed the adverse effects of premature crosslink HPG when preparing fracturing gels using flowback fluids. Additionally,the whole process does not additional separate existed boron-complexes in flowback fluids that increase processing efficiency.
引文
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[21]袁学芳,卜涛,刘举,等.塔里木油田酸压返排液重复利用研究[J].石油与天然气化工,2017,46(3):73-77.
[2]Theodori G L,Luloff A E,Willits F K,et al.Hydraulic fracturing and the management,disposal,and reuse of fracflowback waters:Views from the public in the Marcellus Shale[J].ERSS,2014,2:66-74.
[3]李静群,王俊旭,李武平,等.p H值对水基交联冻胶压裂液体系的影响分析[J].油气井测试,2004,13(1):42-43.
[4]?ztürk N,Kavak D.Adsorption of boron from aqueous solutions using fly ash:Batch and column studies[J].J Hazard Mater,2005,127(1/3):81-88.
[5]Pastor M R,Ruiz A F,Chillón M F,et al.Influence of p H in the elimination of boron by means of reverse osmosis[J].Desalination,2001,140(2):145-152.
[6]Nadav N.Boron removal from seawater reverse osmosis permeate utilizing selective ion exchange resin[J].Desalination,1999,124(1/3):131-135.
[7]Yilmaz A E,Boncukcuo?lu R,Kocakerim M M,et al.The investigation of parameters affecting boron removal by electrocoagulation method[J].J Hazard Mater,2005,125(1/3):160-165.
[8]Ariffin M,Hassan A,Hui L S,et al.Removal of boron from industrial wastewater by chitosan via chemical precipitation[J].Tree Physiology,2009,17(8/9):521-535.
[9]RusnákováL,Andruch V,Balogh I S,et al.A dispersive liquidliquid microextraction procedure for determination of boron in water after ultrasound-assisted conversion to tetrafluoroborate[J].Talanta,2011,85(1):541-545.
[10]Pieruz G,Grassia P,Dryfe R A W.Boron removal from produced water by facilitated ion transfer[J].Desalination,2004,167:417.
[11]国家发展和改革委员会.SY/T 5107—2005水基压裂液性能评价方法[S].北京:石油出版社,2005.
[12]王佳,怡宝安,杨文,等.压裂液用硼交联剂作用机理分析[J].精细石油化工进展,2009,10(8):23-26.
[13]Dydo P.Transport model for boric acid,monoborate and borate complexes across thin-film composite reverse osmosis membrane[J].Desalination,2013,311(4):69-79.
[14]Power P P,Woods W G.The chemistry of boron and its speciation in plants[J].Plant Soil,1997,193(1):1-13.
[15]Evans W J,Mccourtney E J,Carney W B.A comparative analysis of the interaction of borate ion with various polyols[J].Anal Biochem,1979,95(2):383-386.
[16]Staple P H.The effect of boric acid on the reaction of lead tetraacetate with polysaccharides in films and tissue sections[J].J Histochem Cytochem,1957,5(5):472.
[17]Ainley B R,Nimerick K H,Card R J.High-temperature,borate-crosslinked fracturing fluids:A comparison of delay methodology[M]//Enhanced Recovery.Berlin:Springer,1993:517-520.
[18]Ishihara K,Mouri Y,Funahashi S,et al.Mechanistic study of the complex formation of boric acid[J].Inorg Chem,1991,30(10):2356-2360.
[19]Kustin K,Pizer R.Temperature-jump study of the rate and mechanism of the boric acid-tartaric acid complexation[J].J Am Chem Soc,1969,91(2):317-322.
[20]Nagai K.Local steric hindrances and configurations of linear macromolecules in solutions.I.Formulation[J].J Chem Phys,1959,31(5):1169-1174.
[21]袁学芳,卜涛,刘举,等.塔里木油田酸压返排液重复利用研究[J].石油与天然气化工,2017,46(3):73-77.