Volume 34 Issue 5
Sep.  2017
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QI Ben, LIU Wenming, FU Jiawen, LIN Zhihui, SUN Qinliang, WANG Shengming, ZONG Yong. Development and Application of High Density Salt Resistant Spacer BH-HDS[J]. DRILLING FLUID & COMPLETION FLUID, 2017, 34(5): 73-78. doi: 10.3969/j.issn.1001-5620.2017.05.014
Citation: QI Ben, LIU Wenming, FU Jiawen, LIN Zhihui, SUN Qinliang, WANG Shengming, ZONG Yong. Development and Application of High Density Salt Resistant Spacer BH-HDS[J]. DRILLING FLUID & COMPLETION FLUID, 2017, 34(5): 73-78. doi: 10.3969/j.issn.1001-5620.2017.05.014

Development and Application of High Density Salt Resistant Spacer BH-HDS

doi: 10.3969/j.issn.1001-5620.2017.05.014
  • Received Date: 2017-04-11
  • Publish Date: 2017-09-30
  • Wells drilled with high density drilling fluids and wells penetrating formations with salt and gypsum impose stricter requirements on the increase of displacement efficiency of spacers during well cementing. A spacer was formulated with a selected biopolymer, an inorganic suspended matter and compounded inorganic salts as suspending agent, an anionic polymer as thinner, and barite as weighting agent. Study showed that the spacer, with its density adjustable between 1.50 g/cm3 and 2.40 g/cm3, had good rheology and sedimentation stability, and superior high temperature performance. At 180℃, the spacer of 1.80 g/cm3 had density difference of 0.06 g/cm3 between the upper and lower parts of the spacer; when the density of the spacer was 2.20 g/cm3, the density difference became 0.03 g/cm3.Furthermore, this spacer is resistant to the contamination from saltwater of semi-saturation; spacers formulated with saltwater of semi-saturation had good suspension stability and rheology. Good compatibility of the spacer with drilling fluid and cement slurry was obtained by mixing the spacer with drilling fluid, with cement slurry and mixing the space with drilling fluid and cement slurry to test its compatibility. Cement slurries containing the spacer had longer thickening time than pure cement slurries.BH-HDS has been used in high-pressure formations with salt and gypsum (Iraq) and mid-deep reservoir(Dagang oilfield), gaining good operation achievements.

     

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