Volume 37 Issue 1
Feb.  2020
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XIA Jinggang, SHI Ye, ZUO Hongguo, ZHOU Zhiqiang, JIANG Likun, HOU Jianqing. An Environmentally Friendly High Temperature Drilling Fluid Technology[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(1): 59-63. doi: 10.3969/j.issn.1001-5620.2020.01.009
Citation: XIA Jinggang, SHI Ye, ZUO Hongguo, ZHOU Zhiqiang, JIANG Likun, HOU Jianqing. An Environmentally Friendly High Temperature Drilling Fluid Technology[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(1): 59-63. doi: 10.3969/j.issn.1001-5620.2020.01.009

An Environmentally Friendly High Temperature Drilling Fluid Technology

doi: 10.3969/j.issn.1001-5620.2020.01.009
  • Received Date: 2019-10-25
  • Publish Date: 2020-02-28
  • With increasingly rigorous requirement imposed on environment protection, use of conventional drilling fluid additives such as sulfonates and mineral oils is restricted. With wells drilled deeper and deeper, formation temperatures are also becoming higher. The highest temperature that the drilling fluid additives presently used in China can stand is 180 ℃, and the application of these additives will be restricted in drilling wells with higher bottom hole temperatures. To address these problems, two new environmentally friendly high temperature additives, BZ-ZNJ, a viscosifier, and BZ-KGJ, a filter loss reducer, have been developed. An environmentally friendly drilling fluid was then formulated with these two new additives and other environmentally friendly additives. This new drilling fluid has rheology that is controllable at 230 ℃, and its viscosity and gel strength satisfy the needs of drilling operations. The new mud can also be made saturated with salt. It can withstand the contamination of calcium to 1.5% and the contamination of clay to 10%. EC50 of the drilling fluid is greater than 30 000 mg/L, meaning that it is nontoxic. Concentration of metal ions in the drilling fluids is less than the requirements of relevant standards. This new drilling fluid should find its application in drilling operations in environment sensitive areas.

     

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