Volume 34 Issue 4
Jul.  2017
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YANG Guotao, LONG Yingquan, ZHOU Youyuan, WANG Jianwen, WANG Yang, XU Jinyong. Compound Lost Circulation Control Technology for Lost Return in the Sufyan Sub-Block in the West of the 6th Block in Sudan[J]. DRILLING FLUID & COMPLETION FLUID, 2017, 34(4): 55-58. doi: 10.3969/j.issn.1001-5620.2017.04.010
Citation: YANG Guotao, LONG Yingquan, ZHOU Youyuan, WANG Jianwen, WANG Yang, XU Jinyong. Compound Lost Circulation Control Technology for Lost Return in the Sufyan Sub-Block in the West of the 6th Block in Sudan[J]. DRILLING FLUID & COMPLETION FLUID, 2017, 34(4): 55-58. doi: 10.3969/j.issn.1001-5620.2017.04.010

Compound Lost Circulation Control Technology for Lost Return in the Sufyan Sub-Block in the West of the 6th Block in Sudan

doi: 10.3969/j.issn.1001-5620.2017.04.010
  • Received Date: 2017-04-15
  • Publish Date: 2017-07-31
  • Well NW-1 is located in the Sufyan sub-block in the west of the 6th block in Sudan. Lost return has been encountered in the 2nd interval of the well, and LCM slurries and cement slurries have been used to stop mud losses, but all failed. Borehole wall collapse resulted from mud losses led to sidetrack of the well. In the 3rd interval, lost return happened again. Conventional lost circulation materials, cement slurries, stone particles and rubber fragment, which had been tried 30 times in total, failed to stop the mud losses. The mud losses were finally successfully controlled with a reversed-phase gel LCM in one try, and the well was drilled to the designed depth. The use of reversed-phase LCM successfully in controlling mud losses on the well NW-1 is of great importance and has provided good experience and technical support for the operation in Sufyan sub-block of the 6th block in Sudan.

     

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