Petroleum Exploration and Development >

2018 , Vol. 45 >Issue 2: 320 - 325

DOI: https://doi.org/10.11698/PED.2018.02.15

PETROLEUM ENGINEERING

Adsorption damage and control measures of slick-water fracturing fluid in shale reservoirs

  • GUO Jianchun ,
  • LI Yang ,
  • WANG Shibin
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  • State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation in Southwest Petroleum University, Chengdu 610500, China

Received date: 2017-10-14

  Revised date: 2018-01-10

  Online published: 2018-03-22

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Abstract

The slick-water polymer adsorption damage and control measures in shale were examined using a shale pack model of the Ordovician Wufeng Formation-Silurian Longmaxi Formation in the Changning block of the Sichuan Basin. The adsorption law of slick water under different displacement time, concentrations, pH values and temperatures of polymer were tested by traditional displacement experiment and UV-Vis spectrophotometer. The adsorption equilibrium time was 150 min, the amount of adsorption was proportional to the concentration of the polymer, and the maximum adsorption concentration was 1 800 mg/L. With the increase of pH value, the adsorption capacity decreased gradually, the adsorption capacity increased first and then decreased with the increase of temperature, and the adsorption capacity was the largest at 45 ℃. The adsorption patterns of polymers on shale were described by scanning electron microscopy and magnetic resonance imaging. It is proved that the adsorption of polymer on shale led to the destruction of the network structure of anionic polyacrylamide molecules, and the shale adsorption conformation was characterized qualitatively. Finally, according to the adsorption law and adsorption mechanism, it is proposed to reduce the adsorption quantity of polymer on shale surface by using hydrogen bond destruction agent. The effects of hydrogen bond destruction on four kinds of strong electronegative small molecules were compared, the hydrogen bond destroyer c was the best, which lowered the adsorption capacity by 5.49 mg/g and recovered permeability to 73.2%. The research results provide a reference for the optimization of construction parameters and the improvement of slickwater liquid system.

Key words： shale; hydraulic fracturing; slick-water; polymer; shale adsorption; desorption

Cite this article

GUO Jianchun , LI Yang , WANG Shibin . Adsorption damage and control measures of slick-water fracturing fluid in shale reservoirs[J]. Petroleum Exploration and Development, 2018 , 45(2) : 320 -325 . DOI: 10.11698/PED.2018.02.15

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