利用废弃粉煤灰制备聚硅酸,以聚硅酸、硼砂为原料,合成了一种高温延缓型交联剂.采用单因素法,通过测定硼交联剂性能,优选出最佳合成工艺参数为:硼砂5wt%,配体28.5wt%,反应温度80 ℃,催化剂1.5wt%.并对合成目标产物进行了红外光谱表征,其交联的HPG(羟丙基胍胶)冻胶压裂液的高温流变性评价表明,当胍胶浓度为0.45wt%,交联比为100∶0.8(体积比)时,110 ℃,170 s-1的剪切速率条件下,剪切2 h,粘度达到130 MPa·s以上,证明该交联剂对HPG具有较好的交联效果,老化破胶实验表明其交联的压裂冻胶易破胶返排,残渣低.
Taking advantage of fly ash to prepare poly silicic acid, setting polysilicate and borax as the raw materials,a kind of high temperature retarding crosslinking agent was synthesized.With the single factor method and measuring the performance of boron crosslinking agent,the optimum process parameters was obtained that borax mass fraction was 5wt%, ligand mass fraction was 28.5wt%, the reaction temperature was 80 ℃, catalyst mass fraction was 1.5wt%.The target product was characterized by IR,the rheological property of the cross-linked HPG gel fracturing fluid was evaluated on the condition that the concentration of the HPG was 0.45wt%,cross ratio was 100∶0.8 (volume ratio),110 ℃, 170 s-1,shearing 2 h, which turned out that the viscosity of cross-linked HPG gel fracturing fluid was more 130 MPa·s.It proved that the crosslinking agent had better effect on HPG.The breaking test's results shown that the crosslinked fracturing gel had the characteristics of easily breaking and low residue.
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