Volume 33 Issue 2
Mar.  2016
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CUI Yunhai. Reaction of Mud Cake Solidifying Agent with Cement Slurry Filtrate in the Annulus Between Cement Sheath and Formation[J]. DRILLING FLUID & COMPLETION FLUID, 2016, 33(2): 69-74. doi: 10.3969/j.issn.1001-5620.2016.02.015
Citation: CUI Yunhai. Reaction of Mud Cake Solidifying Agent with Cement Slurry Filtrate in the Annulus Between Cement Sheath and Formation[J]. DRILLING FLUID & COMPLETION FLUID, 2016, 33(2): 69-74. doi: 10.3969/j.issn.1001-5620.2016.02.015

Reaction of Mud Cake Solidifying Agent with Cement Slurry Filtrate in the Annulus Between Cement Sheath and Formation

doi: 10.3969/j.issn.1001-5620.2016.02.015
  • Received Date: 2015-11-29
  • Publish Date: 2016-03-31
  • The quality of cementation between cement sheath and borehole wall plays an important role in efficient producing a well.A study on the reaction mechanism of mud cake solidifying agent and filtrate of cement slurry has been conducted based on mud cake solidification technology and modern analysis and test technology.It reveals that the effective constituents of the solidifying agent under pressure will diffuse toward the mud cake,adsorb on the mud cake and finally go into the mud cake.Reaction of the solidifying agent and cement filtrate produces gelled substances such as hydrated calcium silicate (C-S-H) and hydrated calcium aluminate (C3AH6) of low polymerization degrees.These gelled substances,with time,will turn into high polymerization degree hydrated silicates,a process in which in the first 3 days,the quantity of monomer silicates decreases rapidly,the quantity of dimer silicates,at the same time,increases at first,and then decreases.These monomers and dimers will finally become silicates of high polymerization degree,making the mud cake solidified,hence improving the cementation quality of cement sheath and borehole wall.

     

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