Volume 37 Issue 5
Oct.  2020
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LI Ling, JI Yongzhong, XU Qicong, LI Wei, YANG Gang. A High Temperature High Density Diesel Oil Base Drilling Fluid Used in North Block in North Pakistan[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(5): 572-577. doi: 10.3969/j.issn.1001-5620.2020.05.006
Citation: LI Ling, JI Yongzhong, XU Qicong, LI Wei, YANG Gang. A High Temperature High Density Diesel Oil Base Drilling Fluid Used in North Block in North Pakistan[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(5): 572-577. doi: 10.3969/j.issn.1001-5620.2020.05.006

A High Temperature High Density Diesel Oil Base Drilling Fluid Used in North Block in North Pakistan

doi: 10.3969/j.issn.1001-5620.2020.05.006
  • Received Date: 2020-04-21
  • Publish Date: 2020-10-28
  • In the North Block in Pakistan, the geological condition of the formations is very complex, and the formations penetrated have repeated inversion. The petroleum resource is buried deep in high temperature high pressure formations. Wells drilled in this block penetrated long section of shales in the second interval and salt/gypsum sections in the third interval. The shales swell and slough when in contact with water, and tight spots and pipe sticking were encountered in the salt/gypsum sections. Contamination of salt water from the formation to the drilling fluid spoiled the mud and made the mud properties difficult to control. These problems have made the drilling operations in this block extremely difficult, and the North Block is thus famous for being one of the most complex drilling areas in Pakistan or even worldwide. To deal with these problems, a diesel oil drilling fluid was formulated with 0# diesel oil (the continuous phase), CaCl2 water solution (dispersed phase) and other additives selected. This drilling fluid has satisfied the requirements of the local operator company. Laboratory evaluation showed that the properties of the drilling were stable at temperatures up to 180℃. The drilling fluid can be weighted to a density of 2.20 g/cm3. The emulsion stability of the drilling fluid before and after aging was 1200 V. The drilling fluid had good suspending capacity and cuttings carrying capacity. The rheology of the drilling fluid remained stable at high temperature and high pressure. The drilling fluid has the ability to resist contamination from 15% salt water, 10% shale cuttings and gypsum. All these characteristics of the drilling fluid have satisfied the requirements of the drilling operations in the North Block in Pakistan.

     

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