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<p>A degradable filtrate reducer (PLA) is proposed and evaluated to reduce the permeability loss in this work. The degradation experiments showed that PLA can be well degraded into nanoparticles of 70-90 nm in deionized water, generating an aqueous solution with a pH value of 1.97-2.72. The degradation rate is greatly affected by temperature. It takes 8 hours at 140°C and less than 4 hours at 160°C. The filtration loss reduction evaluation experiments showed an excellent performance. The filtration coefficient is 0.622·10<sup>-3</sup> m/min<sup>1/2</sup> and the filtration rate is 1.04·10<sup>-4</sup> m/min when the PLA is 1wt %. Furthermore, the filtration coefficient and filtration rate are reduced when the PLA increased to 3wt %. Both are less the industry standard requirements. The dissolution rate of degradation solution to tight sandstone cuttings is 8.88%. Mineral analysis by X-ray diffraction indicated that calcite and potassium feldspar are preferentially dissolved. A good permeability improvement is verified by core saturation experiments. An average permeability damage rate of 9.89% is achieved when the tight sandstone cores are saturated by gel breaking fluid with 3.0wt % of PLA. This is much less than the average permeability damage rate of 28.29% caused by gel breaking fluid without PLA. There is a permeability damage reduction of 18.4%. As a filtrate reducer, the PLA prevents the fracturing fluid from filtering into the matrix pores during the fracturing process. After the fracturing process, The PLA degrades, removing the filter cake and improving the matrix permeability. This is a most useful method to reduce matrix permeability damage during volume fracturing of water-sensitive tight sandstone reservoirs.</p>

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Investigation of a Degradable Filtrate Reducer for Water-Sensitive Tight Reservoir Stimulation by Slick Water

  • 期刊论文

  • 发表日期：

    2026年6月23日

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  • Xiaojiang Yang,
  • Wen Chen,
  • Dong Wang,
  • Hao Zeng,
  • Jian Li,
  • Qi Qiao,
  • Yang Ting,
  • Baoyue Zhang,
  • Yucai Yang,
  • Yan Liu,
  • Yongqiang Ren,
  • Jinxing Xue,
  • Yang Zhang,
  • Jincheng Mao

摘要

A degradable filtrate reducer (PLA) is proposed and evaluated to reduce the permeability loss in this work. The degradation experiments showed that PLA can be well degraded into nanoparticles of 70-90 nm in deionized water, generating an aqueous solution with a pH value of 1.97-2.72. The degradation rate is greatly affected by temperature. It takes 8 hours at 140°C and less than 4 hours at 160°C. The filtration loss reduction evaluation experiments showed an excellent performance. The filtration coefficient is 0.622·10-3 m/min1/2 and the filtration rate is 1.04·10-4 m/min when the PLA is 1wt %. Furthermore, the filtration coefficient and filtration rate are reduced when the PLA increased to 3wt %. Both are less the industry standard requirements. The dissolution rate of degradation solution to tight sandstone cuttings is 8.88%. Mineral analysis by X-ray diffraction indicated that calcite and potassium feldspar are preferentially dissolved. A good permeability improvement is verified by core saturation experiments. An average permeability damage rate of 9.89% is achieved when the tight sandstone cores are saturated by gel breaking fluid with 3.0wt % of PLA. This is much less than the average permeability damage rate of 28.29% caused by gel breaking fluid without PLA. There is a permeability damage reduction of 18.4%. As a filtrate reducer, the PLA prevents the fracturing fluid from filtering into the matrix pores during the fracturing process. After the fracturing process, The PLA degrades, removing the filter cake and improving the matrix permeability. This is a most useful method to reduce matrix permeability damage during volume fracturing of water-sensitive tight sandstone reservoirs.