Volume 32 Issue 5
Sep.  2015
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ZHAO Yaning, CHEN Jinxia, LU Shuqin, ZHU Kuanliang, XING Daokuan, JIN Zhitie. Borehole Instability and Countermeasures Taken in Drilling Deep Complex Rock Formations in Nanpu[J]. DRILLING FLUID & COMPLETION FLUID, 2015, 32(5): 41-45. doi: 10.3969/j.issn.1001-5620.2015.05.010
Citation: ZHAO Yaning, CHEN Jinxia, LU Shuqin, ZHU Kuanliang, XING Daokuan, JIN Zhitie. Borehole Instability and Countermeasures Taken in Drilling Deep Complex Rock Formations in Nanpu[J]. DRILLING FLUID & COMPLETION FLUID, 2015, 32(5): 41-45. doi: 10.3969/j.issn.1001-5620.2015.05.010

Borehole Instability and Countermeasures Taken in Drilling Deep Complex Rock Formations in Nanpu

doi: 10.3969/j.issn.1001-5620.2015.05.010
  • Received Date: 2015-03-24
  • Publish Date: 2015-09-30
  • Borehole instability has been taking place in drilling the Dong-Er member of the No. 3 Structure in Nanpu. It is found that micro-fractures are quite developed in the deep shale formations, which, under differential pressures, causes water imbibition into the fractures. The absorbed water increases pore pressure of the formations and causes formation to hydrate. Un-uniformity of forces developed in the formations as a result of hydration further enlarges the opening of fractures. Edgetone effect of pressures exerted by drilling fluid causes formation rocks near the borehole wall to slough. Laboratory experiments show that the key to the success of borehole stabilization is to plug and sealthe fractures. A KCl drilling fluid is formulated with 3% FT3000, a plugging agentwithhigh softening point, SPNH, SMP, and 0.8% DSP, a filter loss reducer having viscosifying effect. This drilling fluid has superior plugging and sealing performance as shown in laboratory experiments. In field applications, borehole collapse has been remarkably minimized, and drilling time is reduced from 119.25 d in 2012 to the present 46.4 d, and ROP increased from 6.65 m/s to 12.05 m/s.

     

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