Volume 38 Issue 2
Aug.  2021
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YAO Erdong, WU Guodong, ZHAO Longhao, MELJEM Guli Anweier, LIU Yanchi, ZHOU Fujian. Study on Neutral Integrated Slick Water System for Acidification and Fracturing[J]. DRILLING FLUID & COMPLETION FLUID, 2021, 38(2): 259-264. doi: 10.3969/j.issn.1001-5620.2021.02.022
Citation: YAO Erdong, WU Guodong, ZHAO Longhao, MELJEM Guli Anweier, LIU Yanchi, ZHOU Fujian. Study on Neutral Integrated Slick Water System for Acidification and Fracturing[J]. DRILLING FLUID & COMPLETION FLUID, 2021, 38(2): 259-264. doi: 10.3969/j.issn.1001-5620.2021.02.022

Study on Neutral Integrated Slick Water System for Acidification and Fracturing

doi: 10.3969/j.issn.1001-5620.2021.02.022
  • Received Date: 2021-01-10
  • After conventional fracturing operations, acidification is usually used to relieve the damage of the reservoir. There are many operating steps and poor economic performances. The development of a liquid system that can realize both fracturing and acidification has practical significance. In this paper, a class of neutral and water-soluble lipids with the ability to produce H+ ions were selected. The effective generating H+ concentration and the carbonate dissolution rate of these self-generating acids under different temperature and concentration conditions were measured. Then the optimized self-generating acid was combined with slickwater to form a new neutral integrated slickwater system with acidification function. The frictional drag tester and pressure conduction experiment are used to study the drag reduction, scale inhibition and damage relief capabilities of the system respectively. The research results show that self-generating acid does not generate acid at room temperature, and has obvious slow-rate acid generation capacity at reservoir temperature. The final generating acid concentration is as high as 8% equivalent hydrochloric acid, and the ability of dissolving carbonate rock is 0.41 g/mL. The compatibility of optimized self-generating acid and slick water is good, and the drag reduction rate reaches 72.3%. The pressure conduction experiment shows that traditional slickwater produces 34.8% of the reservoir damage. In striking contrast, this new fracturing fluid not only produced no damage, but also improved permeability of the treated core as high as 29.9%. The new fluid proved the obvious integrated stimulation effect of acidification and fracturing.

     

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