Volume 39 Issue 4
Jul.  2022
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2022  >  39(4): 508-515
WEI Yun, SHEN Xiulun, ZHOU Wei, et al.Damage of sandy conglomerate reservoirs in Dzungar basin by fracturing fluids and measures for protection of the reservoir damage[J]. Drilling Fluid & Completion Fluid，2022, 39（4）：508-515 doi: 10.12358/j.issn.1001-5620.2022.04.017
Citation: WEI Yun, SHEN Xiulun, ZHOU Wei, et al.Damage of sandy conglomerate reservoirs in Dzungar basin by fracturing fluids and measures for protection of the reservoir damage[J]. Drilling Fluid & Completion Fluid，2022, 39（4）：508-515 doi: 10.12358/j.issn.1001-5620.2022.04.017
shu

Damage of Sandy Conglomerate Reservoirs in Dzungar Basin by Fracturing Fluids and Measures for Protection of the Reservoir Damage

doi: 10.12358/j.issn.1001-5620.2022.04.017
  • 1.

    Key Laboratory of Conglomerate Oil and Gas Reservoir Exploration and Development, Karamay, Xinjiang 834000

  • 2.

    Experimental Testing Research Institute of Xinjiang Oilfield Company, Karamay, Xinjiang 834000

  • 3.

    College of Petroleum Engineering, China University of Petroleum (Beijing), Beijing 102249

  • Received Date: 2020-02-03
  • Accepted Date: 2021-11-26
  • Rev Recd Date: 2020-03-11
  • Publish Date: 2022-07-30
    Abstract
  • Formation damage has long been a problem existed in producing through fracturing the conglomerate reservoir in the upper Wuerhe formation in Mahu sag, Dzungar basin. Based on the analysis of the basic characteristics of the upper Wuerhe conglomerate reservoirs in the Mahu-1 block in Dzungar basin, laboratory experiments were performed to evaluate 1) the compatibility between the fluid from fracturing fluid after gel breaking and the formation water, as well as the plugging of reservoir formations by solid particles; 2) the sensitivity of the reservoir to various damaging factors; and 3) capillary imbibition and the swelling of clay minerals though hydration. Main factors contributing to the reservoir damage were analyzed. In the laboratory evaluation experiments, the clay swelling inhibitor and the biomimetic amphiphobic fracturing fluid cleanup additives were selected. In addition, an intelligent quantitative prediction technology for reservoir sensitivity damage was also established. The study results showed that the main factors contributing to the damage of the sandy conglomerate upper Wuerhe formation in the Mahu-1 block in Dzungar basin include swelling of the montmorillonite caused by water absorption, strong capillary imbibition, solid particle blocking, water sensitivity and weak acid sensitivity. In laboratory swelling test with 4% polyetheramine solution, the cores only swelled by 1.28 mm, the cleanup efficiency of the biomimetic amphiphobic cleanup additive was at least 88.54%. The amount of the fluid (2% polyetheramine plus 2% amphiphobic fracturing fluid) absorbed by the cores was 1.38 mL, resulting in a length of swelling of 1.42 mm, and the ratio of the back flowed fracturing fluid was 86.2%. Using the intelligent quantitative prediction technology, the precision of the sensitivity prediction can be as high as more than 85%. All these study results together formed a set of technology for protecting the conglomerate reservoirs in the Mahu block in Dzungar basin.

     

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