Volume 33 Issue 5
Sep.  2016
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SONG Yuanhong, YANG Rong, ZHUANG Jianshan, LV Mengni, XIN Zhijun, DU Mengyu, HE Xiaoping. Study on Polymer Gel Lost Circulation Material[J]. DRILLING FLUID & COMPLETION FLUID, 2016, 33(5): 92-97. doi: 10.3969/j.issn.1001-5620.2016.05.020
Citation: SONG Yuanhong, YANG Rong, ZHUANG Jianshan, LV Mengni, XIN Zhijun, DU Mengyu, HE Xiaoping. Study on Polymer Gel Lost Circulation Material[J]. DRILLING FLUID & COMPLETION FLUID, 2016, 33(5): 92-97. doi: 10.3969/j.issn.1001-5620.2016.05.020

Study on Polymer Gel Lost Circulation Material

doi: 10.3969/j.issn.1001-5620.2016.05.020
  • Received Date: 2016-03-25
  • Publish Date: 2016-09-30
  • In cementing wells that lost circulation have ever occurred, or wells with long cementing section, loss of cement slurry into loss zones will result in a cement top that is lower than the designed depth, hence leaving the reservoir sections uncemented. To deal with these problems, a polymer gel lost circulation material (LCM), CPA, was developed through water solution graft copolymerization. The copolymerization used sodium acrylate (PAANa) and chitosan (CTS) in optimized ratio as raw materials, potassium persulphate (KPS) as initiator, N, N-methylene-bis-acrylamide (NMBA) as cross linking agent, and calcium carbonate (CaCO3) as enhancer. The optimum reaction conditions were as follows:CTS:PAANa=1:7, initiator concentration=3.3%, concentration of cross linking agent=2.1%, reaction temperature=60℃, concentration of CaCO3=1%. The synthesized product was characterized with IR spectroscopy, and was studied for its water adsorptivity in different salt solutions, temperatures, and pH values. The evaluation indicated that CPA had good salt tolerance, and its water adsorptivity in different salt solutions were in the order NaCl > MgCl2 > CaCl2. CPA had higher water adsorption rates at higher temperatures, while the maximum water adsorption scale factor remained almost the same. At pH value of 5-9, CPA had the maximum water adsorptivity.

     

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