Volume 35 Issue 3
May  2018
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JIAO Xiaoguang. Drilling Fluid Technology for “Integrated” Wells in North Troyes Oilfield in Kazakhstan[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(3): 79-83. doi: 10.3969/j.issn.1001-5620.2018.03.013
Citation: JIAO Xiaoguang. Drilling Fluid Technology for “Integrated” Wells in North Troyes Oilfield in Kazakhstan[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(3): 79-83. doi: 10.3969/j.issn.1001-5620.2018.03.013

Drilling Fluid Technology for “Integrated” Wells in North Troyes Oilfield in Kazakhstan

doi: 10.3969/j.issn.1001-5620.2018.03.013
  • Received Date: 2017-12-13
  • Publish Date: 2018-05-30
  • The north Troyes oilfield (Kazakhstan) in recent years has been carrying out the "integrated" drilling mode which imposes new challenges to drilling fluid. To deal with the challenges, a saturated polymer sulfonate drilling fluid was formulated based on the analyses of geology of the formations and technical problems associated with drilling fluid operations in the north Troyes oilfield. The saturated drilling fluid was treated with two temporary plugging agents, ZD-1 and EP-1. ZD-1 is an acid soluble rigid particle, while EP-1 is an oil soluble deformable particle. The particle size distribution of ZD-1 and EP-1 is compatible with the sizes of pore throat in the reservoir. Test of the drilling fluid treated with 2% EP-1 and 3%ZD-1 on core samples showed that the permeability recovery of the cores was 89%, exceeding the predetermined target of 85% and satisfying the needs of drilling operations. This drilling fluid formulation was used on the first "integrated" well H817 in Kazakhstan, and the well was drilled to the designed depth successfully. Average percent hole enlargement of the well is less than 8% and the ROP is increased by 15.2%. The temporary plugging agents used are able to protect porous carbonate reservoir and reservoirs with micro-fractures from being damaged. Daily oil production rate of the well H817 is 110 t, which is 26.4% higher than the daily production rate of adjacent wells.

     

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