延长油田水基压裂液用有机硼交联剂的合成、评价与现场应用

【作者】 陈静；

【导师】 马政生；

【作者基本信息】 西北大学 ， 应用化学， 2012， 硕士

【摘要】 本文以硼酸为原料,在NaOH催化作用下与乙二醇和三乙醇胺进行络合反应制备了油井压裂液用有机硼交联剂。研究了反应时间、反应温度、硼酸和乙二醇用量对有机硼交联剂延迟交联时间和所形成的压裂液冻胶耐温性的影响,以及催化剂用量对交联剂稳定性的影响。确定了最佳反应条件：反应时间4h,温度120℃,三乙醇胺53.4%,硼酸21.4%,乙二醇17.2%,NaOH加量1.7%。在最佳工艺条件下完成了五个批次200kg的中试,确定了生产工艺流程。为提高压裂液的配伍性和稳定性,筛选了一种新型水溶性杀菌剂FY-SJ,与传统的杀菌剂1227和戊二醛相比,具有气味低、与各种压裂助剂配伍性好的优点,并对羟丙基瓜尔胶水溶液粘度损失小(<10%),可使交联比降低,用其配制的压裂液冻胶性能良好,且配制、使用简便,保质时间长。将合成的有机硼交联剂、筛选的FY-SJ压裂液杀菌剂应用于以羟丙基瓜尔胶为稠化剂的水基压裂液体系,依据相应的行业标准进行了室内评价结果表明：此压裂体系具有较好的耐温抗剪切性能、破胶彻底、滤失小、残渣含量少、对支撑裂缝导流能力和岩心伤害小。同时在延长油田定边采油厂完成了六口油井的现场压裂实验,施工顺利,返排效果良好,为该压裂液体系的进一步推广应用奠定了基础。更多还原

【Abstract】 A bororganic crosslinker for fracturing fluid of oil well was prepared by boric acid, ethylene glycol and triethanolamine with sodium hydroxide as catalyst.The effect of reaction time, reaction temperature, the amounts of boric acid and ethylene glycol on the properties of product in crosslinking time and HFGF crosslinkedn in heat resistant was studied. Meanwhile, the effect of catalyst amount on the property of bororganic crosslinker in storage stability was discussed. The optimum reaction condition was obtained:reaction time4h, reaction temperature120℃, triethanolamine53.4%, boric acid21.4%, ethylene glycol17.2%and NaOH1.7%. Under the optimum conditions,5batches of200kg pilot was completed and determined of the production process.In order to improve the compatibility and stability of fracturing fluid, a new water-soluble bactericide FY-SJ was selected. By contrast with1227and glutaraldehyde, FY-SJ had advantage of both low odor and good compatibility with various fracturing additives.It reduced the viscosity loss of hydroxypropyl guar gum solution and crosslinking ratio.The fracturing fluid of prepared with it appeared the excellent performance,for example: storage time preparation and use.According to the corresponding industry standards, the performance of fracturing fluid, with hydroxypropyl guar gum as thickener, synthetic organic boron as crosslinking agent, FY-SJ as fracturing fluid bacteriacide was evaluated in laboratory. The results shown:the fracturing fluid possessed temperature stability, shearing resistance, completely gel-breaking property with less filter loss and residue, low fracture flow conductivity and core damage. Meanwhile, the fracturing fluid was completed field fracture experiments of6production wells in Dingbian oil production plant of Yanchang oilfield. The field application was successful, and flow back of this fracturing fluid was achieved good result, which laid the foundation for further popularization and application of this fracturing fluid system.更多还原