熊俊杰. 生物酶/过硫酸铵对胍胶压裂液破胶作用机制研究[J]. 石油钻探技术,2024,52(4):1-6. DOI: 10.11911/syztjs.2024071
引用本文: 熊俊杰. 生物酶/过硫酸铵对胍胶压裂液破胶作用机制研究[J]. 石油钻探技术,2024,52(4):1-6. DOI: 10.11911/syztjs.2024071
XIONG Junjie. Study on gel breaking mechanism of guar gum fracturing fluid by biological enzyme and ammonium persulfate[J]. Petroleum Drilling Techniques, 2024, 52(4):1-6. DOI: 10.11911/syztjs.2024071
Citation: XIONG Junjie. Study on gel breaking mechanism of guar gum fracturing fluid by biological enzyme and ammonium persulfate[J]. Petroleum Drilling Techniques, 2024, 52(4):1-6. DOI: 10.11911/syztjs.2024071

生物酶/过硫酸铵对胍胶压裂液破胶作用机制研究

Study on gel breaking mechanism of guar gum fracturing fluid by biological enzyme and ammonium persulfate

  • 摘要: 为有效降低胍胶压裂液破胶后产生的残渣对地层造成的伤害,通过分析不同破胶方式下胍胶压裂液破胶液的分子物理化学性质,探究了生物酶及过硫酸铵/生物酶复合破胶剂对胍胶压裂液的破胶作用机制。研究发现,与过硫酸铵破胶剂相比,生物酶及过硫酸铵/生物酶复合破胶剂能更有效地降低破胶液的相对分子质量和分子尺寸;胍胶压裂液破胶液中的降解产物主要是二糖—五糖。胍胶压裂液破胶液残渣分析表明,残渣分子中甘露糖与半乳糖的含量比只有0.38,这是导致其水溶性差,也是其存在残渣的主要原因。同时,通过模拟试验,发现注酸可以有效降解胍胶压裂液破胶液残渣,提高支撑剂导流能力。研究结果可以为破胶剂优选和降低胍胶压裂液破胶液残渣造成的伤害提供依据。

     

    Abstract: To solve the problem that the residue produced after the gum fracturing fluid is broken will cause damage to the formation. In this paper, the molecular weight, molecular size and the relative content of oligosaccharides in guar gum fracturing fluid under different breaking methods were studied, and the molecular composition and content of residue were studied. The results show that compared with ammonium persulfate breaker, biological enzyme , ammonium persulfate and composite breaker can effectively reduce the molecular weight and molecular size of gel breaker; The oligosaccharide in the gel breaking solution is mainly disaccharide pentasaccharide; The analysis of gel breaker residue showed that the content ratio of mannose / galactose in residue molecule was 0.38, and the low ratio resulted in poor molecular water solubility. The use of acid action mode can effectively degrade the residue and improve the conductivity of proppant.

     

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