摘要
针对目前国内常规有机硼交联剂耐温性低的缺点，采用向有机硼交联剂中引入高价金属的方法，研制出耐温性能达到180℃的超高温有机硼交联剂DG-ZCY-15，通过考察高价金属加量及碱加量对压裂液耐温性能及交联时间的影响，得到了耐温性能达到180℃且具有良好的延迟交联性的压裂液配方：0．57％羟丙基瓜尔胶＋0．45％DG．ZCY-15＋0．3％DG．10温度稳定剂＋0．3％碱＋0．03％P-33型破胶剂＋其它，综合评价了该压裂液体系的性能，并介绍了该压裂液体系在大港油田的应用情况。实验结果表明，180℃、170s^-1条件下剪切120min后压裂液的黏度仍在50mPa·8以上，能满足超高温、超深储层的加砂压裂施工要求。破胶液的黏度仅为1．45mPa·s，破胶液的表面张力仅27．8mN／m，对3口井岩心的伤害率均在20％以下。该压裂液在大港油田进行了50余井次的现场试验，最高井温达189℃，施工成功率100％，均取得了良好的压裂效果。图3表2参5
Abstract
Aimed at the shortcoming of the lower applicable temperature of the current domestic conventional organic boron crosslinker,an organic boron crosslinker DG-ZCY-15,which could be resistant to ultra high temperature of 180℃,was prepared by introducing high valence metal ions.The effects of the high metal content and alkali content on the heat resistance and gelling time of the fracturing fluid was investigated,as a result,the optimal formula of a fracturing fluid,possessing the advantage of heat resistance of 180℃and adjustable delayed crosslinking,was obtained as follows: 0.57% hydroxyl guar gum + 0.45%DG-ZCY-15+0.3% DG-10 temperature stabilizer + 0.3% alkali + 0.03% P-33 gel breaker + other.The performance of the fracturing fluid was evaluated and the application of the fracturing fluid in Dagong oilfield was introduced.The results showed that at the temperature of 180℃,the viscosity of the fracturing fluid was still above 50 mPa · s after being sheared for 120 min at the shear rate of 170 s-1,meeting the requirements of the sand fracturing construction in the super high temperature,super deep reservoir;the viscosity of the gel breaking liquid was only 1.45 mPa · s,and the surface tension of the gel breaking liquid was only 27.8 mN/m,moreover,the damage rate of the gel breaking liquid on the cores of 3 wells was below 20%.The fracturing fluid had been used in 50 wells,which the maximum botton temperature reached 189℃ in Dagang oilfield,the construction success rate being of 100%,hence,the satisfactory effects was achieved.
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