Volume 37 Issue 6
Dec.  2020
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LI Xiong, DONG Xiaoqiang, JIN Junbin, YANG Xiaohua. Study and Application of an Ultra-High Temperature High Density Drilling Fluid[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(6): 694-700. doi: 10.3969/j.issn.1001-5620.2020.06.003
Citation: LI Xiong, DONG Xiaoqiang, JIN Junbin, YANG Xiaohua. Study and Application of an Ultra-High Temperature High Density Drilling Fluid[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(6): 694-700. doi: 10.3969/j.issn.1001-5620.2020.06.003
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Study and Application of an Ultra-High Temperature High Density Drilling Fluid

doi: 10.3969/j.issn.1001-5620.2020.06.003

  • 1. State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 100101;

  • 2. SINOPEC Research Institute of Petroleum Engineering, Beijing 100101

  • Received Date: 2020-09-23
  • Publish Date: 2020-12-28
    Abstract
  • Most of the high-density drilling fluids weighted with barite are often faced with high temperature problems such as difficulty in rheology control, high HTHP filter loss and barite sag etc. A drilling fluid design clue is presented to deal with these problems. An ultra-high temperature high density drilling fluid SMUTHD was formulated with a self-developed ultra-high temperature filter loss reducer SMPFL-UP, a self-developed dispersant for use in ultra-high temperature high density fluids, a high temperature plugging antisloughing agent SMNA-1, a high temperature stabilizer GWW and a high-efficiency lubricant SMJH-1 etc. The SMUTHD drilling fluid can be used at high temperatures up to 220 ℃. At density of less than 2.40 g/cm3, the SMUTHD drilling fluid had stable rheology, HTHP filter loss of less than 12 mL and extreme friction coefficient of 0.178 after aging at 220 ℃. The settling factor (SF) of SMUTHD standing for 7 d at 220 ℃ was less than 0.54. These data indicate that the SMUTHD drilling fluid has good rheological and filtration control properties as well as high temperature settling performance when its density is not higher than 2.40 g/cm3. The SMUTHD drilling fluid has been successfully used in drilling the 5th interval of the well Shunnanpeng-1, with total footage of 581 m drilled. The bottom hole temperature of this well was 207.4 ℃, and the density of the drilling fluid was 1.75-1.80 g/cm3. Drilling fluids in different operational stages all had SF of less than 0.52. The properties of the drilling fluid were stable and no downhole troubles happened during drilling. Coring operation was performed smoothly. The development of SMUTHD has not only greatly ensured the exploration and discovering of deep oil and gas reservoirs, the increase of petroleum reserves and production as well as oil and gas development with low cost and high efficiency, it has also improved the level of autonomy of China’s ultra-high temperature and high density drilling fluid technology.

     

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