Volume 40 Issue 4
Jul.  2023
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WANG Long, FANG Jing, DONG Xiumin, et al.Reservoir friendly ultra-fine manganese tetroxide for drilling fluids[J]. Drilling Fluid & Completion Fluid,2023, 40(4):467-474 doi: 10.12358/j.issn.1001-5620.2023.04.008
Citation: WANG Long, FANG Jing, DONG Xiumin, et al.Reservoir friendly ultra-fine manganese tetroxide for drilling fluids[J]. Drilling Fluid & Completion Fluid,2023, 40(4):467-474 doi: 10.12358/j.issn.1001-5620.2023.04.008

Reservoir Friendly Ultra-fine Manganese Tetroxide for Drilling Fluids

doi: 10.12358/j.issn.1001-5620.2023.04.008
  • Received Date: 2023-01-03
  • Rev Recd Date: 2023-02-13
  • Publish Date: 2023-07-30
  • High density drilling fluids weighted with barite were used in deep well and ultra-deep well drilling in the Shunbei block. Several problems were found with these drilling fluids during drilling, such as difficulties in maintaining mud rheology, poor settling stability as well as reservoir damage by the solid particles from the drilling fluids etc. Micromax as a weight material has been reported in dealing with these problems, but the use of Micromax in China has been limited because of technical monopolization and high cost. A new drilling fluid micro-manganese weighting additive DFMT01 was developed using the “manganese ore method”. As a cost-effective domestic micro-manganese product, DFMT01 was used to formulate reservoir protective drilling fluids. The molecular structure of DFMT01 was characterized, and the performance of DFMT01 was evaluated in the high density sulfonated drilling fluids used in the Shunbei block. The results of field application of DFMT01 show that it has good physical and chemical properties. DFMT01 has a density of 4.7 g/cm3, an acid solubility of at least 99%, a D50 of 1.17 μm and particle sphericity of 0.967, all these properties are comparable to the equivalent products from abroad. Drilling fluids weighted with DFMT01 have rheology, filtration property, erosion property and reservoir protective capacity equal to or better than those of the drilling fluids weighted with Micromax. A “neutralize to precipitate calcium carbonate – recover manganese ions with sulfuric acid – coagulate to treat the waste water” method was used in the treatment of high concentration acidic waste liquids containing manganese. Using this method, waste waters after treatment has mass concentration of manganese of 0.45 mg/L and SS of 10 mg/L, reaching the requirement of the first-level standard. The waste water treatment method can be used in the manufacturing, using and treatment of DFMT01 as a closed loop. DFMT01 is a weighting material having excellent property, low cost and very broad promotion and application prospects.

     

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