塔里木库车山前区块属于超深高温高压区块,具有埋藏深、温度高、地层压力高的特点,常规的压裂液不能满足该区块的施工要求。为此,以丙烯酰胺(AM)、三甲基(3-丙烯酰胺丙基)氯化铵(APTAC)、3-丙烯酰乙醇基-3-甲基丙磺酸(AEMS)为单体,通过优化添加剂用量和反应参数,合成了具有耐温、耐盐、低伤害性能的聚合物稠化剂JAS-3,并对其性能进行了评价。研究表明:JAS-3配制的聚合物压裂液具有良好的耐温耐剪切性、携砂性能及对储层的低伤害性能,加入质量分数为30%～40%的NaBr后,在温度为180 ℃、转速为170 r/s下,黏度仍能保持在85 mPa·s以上;聚合物压裂液具有较大的弹性模量、较小的黏性模量,刚度更大,携砂性能好,同时破胶后残渣含量低,对储层伤害小。该压裂液在塔里木库车山前区块实验6口井,取得了良好的增产效果。JAS-3稠化剂的研制对于超深高温高压区块的压裂具有重要的借鉴意义。
The Kuqa Piedmont Block in Tarim is an ultra-deep high temperature and high pressure block with the characteristics of deep burial, high temperature and high formation pressure, so conventional fracturing fluids are not favoralole for the construction requirements of this block. To this end, acrylamide (AM), trimethyl (3-acrylamidopropyl) ammonium chloride (APTAC), 3-acryloylethanol-3-methylpropanesulfonic acid (AEMS) were used as monomers to synthesize the polymer thickener JAS-3 with temperature resistance, salt resistance and low damage through the optimization of additives dosage and reaction parameters, and the properties of such polymer thickener were evaluated. The research shows: The polymer fracturing fluid prepared with JAS-3 has good temperature and shear resistance, sand-carrying performance and low damage to the reservoir. After adding NaBr with a mass fraction of 30% to 40%, its viscosity can still be maintained above 85 mPa·s at a temperature of 180 ℃ and a rotation speed of 170 r/s. The polymer fracturing fluid has a large elastic modulus, a small viscosity modulus, a larger rigidity, good sand-carrying performance, and meanwhile it has low residue content after gelout, causing small damage to the reservoir. The fracturing fluid has been tested in 6 wells in the Kuqa Piedmont Block in Tarim, and has achieved good stimulation effects. The development of the thickener has important reference significance for the fracturing of ultra-deep high temperature and high pressure blocks.
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