Volume 40 Issue 5
Dec.  2023
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2023  >  40(5): 622-628
WANG Xiaohui, WANG Xudong, JIANG Chunli, et al.Using rsm to determine electric gel breaking conditions for waste high density water based drilling fluids[J]. Drilling Fluid & Completion Fluid，2023, 40（5）：622-628 doi: 10.12358/j.issn.1001-5620.2023.05.011
Citation: WANG Xiaohui, WANG Xudong, JIANG Chunli, et al.Using rsm to determine electric gel breaking conditions for waste high density water based drilling fluids[J]. Drilling Fluid & Completion Fluid，2023, 40（5）：622-628 doi: 10.12358/j.issn.1001-5620.2023.05.011
shu

Using RSM to Determine Electric Gel Breaking Conditions for Waste High Density Water Based Drilling Fluids

doi: 10.12358/j.issn.1001-5620.2023.05.011
  • 1.

    School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580

  • 2.

    School of Petroleum Engineering, Shandong Institute of Petroleum and Chemical Technology, Dongying, Shandong 257061

  • 3.

    Drilling Fluid Technology Service Center of SINOPEC Shengli Petroleum Engineering Co., Ltd., Dongying, Shandong 257000

  • 4.

    Key Laboratory of Unconventional Oil and Gas Development of Ministry of Education, China University of Petroleum (East China), Qingdao, Shandong 266580

  • Received Date: 2023-03-10
  • Rev Recd Date: 2023-05-06
  • Publish Date: 2023-12-25
    Abstract
  • As oil and gas wells are drilled deeper and deeper, higher formation pressures need to be balanced with high density drilling fluids, and this leads to another problems: the treatment of more and more high density waste muds. Waste muds are generally treated with chemical flocculants and problems such as high treatment cost, poor universality and potential secondary pollution are the norm. In a study an electric field was applied to treat a high density waste mud. Based on the results of a single-factor experiment, the effects of three factors, i.e., current intensity, time of gel breaking and the distance between two electrodes, as well as the interaction of the three factors on the Zeta potential and particle size distribution of the drilling fluid were studied using response surface methodology (RSM). It was found that an optimum gel breaking can be obtained when the electric current intensity = 8 A, the time of gel breaking = 10 min, and the distance between two electrodes = 3 cm. After gel breaking, the Zeta potential of the drilling fluid was increased by 38.29%, reaching −26.2 mV, and the particle size distribution factor D90 reached 562.5 μm, indicating that the gel stability of the waste drilling fluid was broken, and this provided a powerful support to the subsequent recovery of the useful mud components as well as the treatment of the waste portion of the waste drilling fluid.

     

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