Volume 40 Issue 4
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LI Sheng.Research and application of dual-protective oilfield water drilling fluids system without solid[J]. Drilling Fluid & Completion Fluid，2023, 40（4）：431-437 doi: 10.12358/j.issn.1001-5620.2023.04.003
Citation: LI Sheng.Research and application of dual-protective oilfield water drilling fluids system without solid[J]. Drilling Fluid & Completion Fluid，2023, 40（4）：431-437 doi: 10.12358/j.issn.1001-5620.2023.04.003
shu

Research and Application of Dual-protective Oilfield Water Drilling Fluids System Without Solid

doi: 10.12358/j.issn.1001-5620.2023.04.003
  • 1.

    Sinopec Research Institute of Petroleum Engineering Co., Ltd, Beijing 102206

  • 2.

    State Key Laboratory of Shale Oil and Gas Enrichment Mechanism and Effective Development, Beijing 102206

  • Received Date: 2023-02-16
  • Rev Recd Date: 2023-04-23
  • Publish Date: 2023-07-30
    Abstract
  • During the development of the carbonate reservoir of the Tahe oilfield, the conventional polysulfonate drilling fluid damages reservoir duo to non-acid-soluble solid phase after loss, and sulfonalized agent does not conform to the concept of green development. The oilfield water is introduced to formulate a solid free drilling fluid to avoid damage reservoir from solid, and the key treatment agents such as anti-high temperature anti-calcium viscosifier, flow pattern modifiers, high-temperature anti-calcium polymer filtrate reducer. The dual-protective oilfield water drilling fluids system without solid was developed. Indoor evaluation datas show that the drilling fluid was heat resistant to 150 ℃, the ratio between yield point and plastic viscosity is as high as 0.68～0.76 Pa/mPa·s, the EC50 value of biological toxicity indicators is as high as 28,600 mg/L, and the bio-degradation index BOD5/CODCr is as high as 21.35%. The dynamic permeability recovery value is as high as 91.8%, which has good formation damage control performance. The developed dual-protective oilfield water drilling fluids without solid were successfully used in more than ten sidetrack wells,and the application effect was significant.

     

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