Volume 32 Issue 1
Jan.  2015
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2015  >  32(1): 22-25,29
ZHANG Chong, REN Guanlong, ZENG Chunmin, YU Yi, WU Jiang. Study on Solids-free High Temperature Drilling Fluid Used in Wenchang Gas Field[J]. DRILLING FLUID & COMPLETION FLUID, 2015, 32(1): 22-25,29. doi: 10.3969/j.issn.1001-5620.2015.01.006
Citation: ZHANG Chong, REN Guanlong, ZENG Chunmin, YU Yi, WU Jiang. Study on Solids-free High Temperature Drilling Fluid Used in Wenchang Gas Field[J]. DRILLING FLUID & COMPLETION FLUID, 2015, 32(1): 22-25,29. doi: 10.3969/j.issn.1001-5620.2015.01.006
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Study on Solids-free High Temperature Drilling Fluid Used in Wenchang Gas Field

doi: 10.3969/j.issn.1001-5620.2015.01.006

  • Research Center of Drilling and Production, Nanyou Erqu, Potou District, Zhanjiang City, Guangdong 524057, china

  • Received Date: 2015-01-13
  • Publish Date: 2015-01-30
    Abstract
  • Three blocks, Wenchang 9-2, Wenchang 9-3 and Wenchang 10-3, are gas fields located in the Zhujiangkou Basin. Gas reservoirs in this basin are characteristic of high temperature (165℃) and low permeability. Laboratory studies had been performed on PRD, a solids free drilling fluid used by CNOOC in oil and gas well drilling, to improve its high temperature performance. PRD was optimized with high temperature filter loss reducer, high temperature viscosifier, high temperature drilling starch, water block preventing agent, ultrafine calcium carbonate, polyamine, and high temperature stabilizer. The new formulation was stable at 170℃, and percent shale core sample recovery rate was 95.3%. Return permeability of fluid-contaminated cores was greater than 90%, while the mud cake formed on the cores was very easy to remove. The selected water block preventer, when added at a concentration of 2%, reduced the surface tension of the gas-liquid interface of mud filtrate to less than about 30.0 mN/m, and that of oil-water interface to less than 5 mN/m, a very good water block preventer for reservoir protection. This new formulation is suitable for use in offshore drilling where low permeability and high temperature reservoirs are horizontally drilled.

     

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