Volume 34 Issue 4
Jul.  2017
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LI Dan, YI Xiangyi, WANG Yanlong, SHI Li, WEN Xiaoyong, LIU Xiang. Experimental Study on Fracture Plugging Performance of Volumetric Expansion Nano Particles Used in Well Fracturing[J]. DRILLING FLUID & COMPLETION FLUID, 2017, 34(4): 112-116. doi: 10.3969/j.issn.1001-5620.2017.04.021
Citation: LI Dan, YI Xiangyi, WANG Yanlong, SHI Li, WEN Xiaoyong, LIU Xiang. Experimental Study on Fracture Plugging Performance of Volumetric Expansion Nano Particles Used in Well Fracturing[J]. DRILLING FLUID & COMPLETION FLUID, 2017, 34(4): 112-116. doi: 10.3969/j.issn.1001-5620.2017.04.021
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Experimental Study on Fracture Plugging Performance of Volumetric Expansion Nano Particles Used in Well Fracturing

doi: 10.3969/j.issn.1001-5620.2017.04.021

  • 1. College of Energy, Chengdu University of Technology, Chengdu, Sichuan 610059;

  • 2. State Key Laboratory of Oil and Gas Geology and Exploitation, Chengdu University of Technology, Chengdu, Sichuan 610059;

  • 3. Research Institute of Oil and Gas Technology, PetroChina Changqing Oilfield Company, Xi'an, Shaanxi 710021

  • Received Date: 2017-04-25
  • Publish Date: 2017-07-31
    Abstract
  • Nano particles as plugging agent used to shut off fractures with small sizes have been frequently studied in recent year, while their use in shutting off water-producing fractures in low-permeability reservoirs in fracturing operation is less studied. In this study nano particles were selected for fracture plugging experiment. Nano particles' ability to shut off fractures producing water and fractures producing oil was evaluated on a self-made core plugging experiment device. Nano particles' expandability, injectability and the resistance to washing in fractures with water flow were also studied. The experimental results showed that the volumetric expansion nano particles absorb water and expand greatly in water environment. In oil environment, the nano particles have very weak expandability. The nano particles can shut off fractures producing water very well. The amount of water shut off at confining pressure of 40 MPa and 50MPa can be as high as 90%. In shutting off fractures with oil flow, there is only 30% of the oil shut off. The nano particles have good injectability; at confining pressure of 40 MPa, 3 PV of fluid containing 2% nano particles were injected into fractures with water flow, and they stayed firmly inside the fractures after expanding for 4 d. These experimental data prove that the volumetric expansion nano particles will shut off water instead of oil, and can be used in well fracturing and water shutoff.

     

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