Volume 32 Issue 6
Nov.  2015
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LU Shuqin, JIANG Wei, CHEN Jinxia, WU Yan. Drilling Fluid Technology for Drilling Nanpu Buried Hill Oil Reservoir[J]. DRILLING FLUID & COMPLETION FLUID, 2015, 32(6): 18-21. doi: 10.3969/j.issn.1001-5620.2015.06.005
Citation: LU Shuqin, JIANG Wei, CHEN Jinxia, WU Yan. Drilling Fluid Technology for Drilling Nanpu Buried Hill Oil Reservoir[J]. DRILLING FLUID & COMPLETION FLUID, 2015, 32(6): 18-21. doi: 10.3969/j.issn.1001-5620.2015.06.005

Drilling Fluid Technology for Drilling Nanpu Buried Hill Oil Reservoir

doi: 10.3969/j.issn.1001-5620.2015.06.005
  • Received Date: 2015-07-03
  • Publish Date: 2015-11-30
  • The Nanpu buried hill oil reservoir(Jidong Oilfield) is characteristic of deep burial at 4, 000-5, 600 m, high formation temperature(4.22℃/100 m, and 223℃ atbottom hole), low formation pressure(pressure coefficient 0.96), and developed fractures.The produced oil has high gas/oil ratios.A high temperature low density low solids content drilling fluid and a high temperature gel plug have been developed for use in reservoir drilling in Nanpu.The high temperature drilling fluid retains its good performance at 220℃, and the gel plug functions at 170℃.In formulating the high temperature low density low solids drilling fluid, two tetra-polymers were chosen as the high temperature viscosifiers and high temperature filter loss reducer, respectively.SMP, SPNH and a high temperature sealing agent, FT3000, were also used to improve the properties of the drilling fluid.A high temperature oil-in-water drilling fluid was formulated with two emulsifiers, HWZR and HWFR, (both are high temperature stable and salt resistant) a viscosifier HVF-H and two high temperature filter loss reducers, HWFL-H and HVS-H.The two drilling fluids have good performance after aging at 220℃ for48 h, and densities ranging between 0.98 g/cm3 and 1.08 g/cm3.Using the gel plug, oil and gas zones are isolated and protected during pipe tripping and casing tieback.The high temperature low density low solids drilling fluid has been used in 8 wells, the oil-in-water drilling fluid used in 13 wells, and the gel plug used in 2 wells, all proved successful in reservoir protection.

     

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