Volume 38 Issue 4
Jul.  2021
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KANG Hongbing, NIU Chengcheng, JIA Hu, et al.Ultra-high temperature workover fluid with flexible rubber particles used in shunbei oilfield[J]. Drilling Fluid & Completion Fluid，2021, 38（4）：525-530 doi: 10.3969/j.issn.1001-5620.2021.04.020
Citation: KANG Hongbing, NIU Chengcheng, JIA Hu, et al.Ultra-high temperature workover fluid with flexible rubber particles used in shunbei oilfield[J]. Drilling Fluid & Completion Fluid，2021, 38（4）：525-530 doi: 10.3969/j.issn.1001-5620.2021.04.020
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Ultra-High Temperature Workover Fluid with Flexible Rubber Particles Used in Shunbei Oilfield

doi: 10.3969/j.issn.1001-5620.2021.04.020
  • 1.

    Key Laboratory of Enhanced Oil Recovery in Carbonate Fractured-vuggy Reservoirs, CNPC, Urumqi, Xinjiang 830011

  • 2.

    Research Institute of Petroleum Engineering, SINOPEC Northwest Company of China Petroleum and Chemical Corporation, Urumqi, Xinjiang 830011

  • 3.

    School of Petroluem Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500

  • Received Date: 2021-02-28
  • Publish Date: 2021-07-31
    Abstract
  • The conventional viscosified workover fluid used in the high temperature oil and gas wells in Shunbei Oilfield is easy to lose its viscosity. To solve this problem, a new workover fluid containing flexible rubber particles that is able to resist 180 ℃ was developed based on the fact that the viscosity of a flexible high molecular weight rubber particle changes in a pattern of “disperse, degrade, viscosify, and stabilize viscosity”. The dynamic viscosity of this workover fluid can be adjusted between 20 mPa·s and 140 mPa·s. The density of the workover fluid adjusted between 1.0 g/cm3 and 1.3 g/cm3, which means that the workover fluid can be weighted with or without solid weighting agents. The pattern of the viscosity change of the workover fluid at different temperatures was studied. After aging for 1 day at 180 ℃, the viscosity of the workover fluid was apparently higher than that of a conventional xanthan gum workover fluid, indicating that the new workover fluid had the ability of stabilizing its viscosity. The rate of corrosion of this workover fluid to aluminum alloy is less than 2.22 g/(m2·h). The workover fluid also had very good sand carrying capacity. This study has certain guiding significance for the safe and efficient workover operations of high-temperature oil and gas wells in Shunbei.

     

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