Volume 37 Issue 5
Oct.  2020
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WANG Meng, CHE Mingguang, ZHOU Changlin, LI Li, CHEN Weihua, LIU Fei. A Novel Gelled Acid for the Acid Fracturing of the High-Temperature Carbonates and its Application[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(5): 670-676. doi: 10.3969/j.issn.1001-5620.2020.05.022
Citation: WANG Meng, CHE Mingguang, ZHOU Changlin, LI Li, CHEN Weihua, LIU Fei. A Novel Gelled Acid for the Acid Fracturing of the High-Temperature Carbonates and its Application[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(5): 670-676. doi: 10.3969/j.issn.1001-5620.2020.05.022

A Novel Gelled Acid for the Acid Fracturing of the High-Temperature Carbonates and its Application

doi: 10.3969/j.issn.1001-5620.2020.05.022
  • Received Date: 2020-07-15
  • Publish Date: 2020-10-28
  • Acid fracturing is a key measure to the efficient development of oil and gas from carbonate reservoirs. The properties and compatibility of the working fluid used for acid fracturing with the reservoir formations are prerequisite to the succuss of the stimulation job. Acid fluids presently in use cannot well satisfy the requirements of acid fracturing deeply buried high temperature reservoirs, and a new high temperature gelled acid for acid fracturing carbonate formations was thus developed to fill this gap. Performance evaluation and field application of the gelled acid showed that the gelling agent used in the new gelled acid (0.8%) can reduce flow friction by 68.5%. Test on N80 specimen with the corrosion inhibitor used and the gelled acid at 180℃ showed that the rate of corrosion inhibition can be 96.70% and 98.03%, respectively. After being sheared at 180℃ and 170 s-1 for 70 min, the gelled acid still retained a viscosity of 23.0 mPa·s. Aged for 4 h at 180℃, the gelled acid was still homogeneous, showing no precipitation, residue and stratification etc. The rate of reaction of the new gelled acid with rock samples was half the rate of reaction of the conventional gelled acids presently in use with the same rock samples. These properties of the new gelled acid are beneficial to the mitigation of operational difficulties and risks. Using this new gelled acid, deep penetration of the acid fluid into the reservoirs can be achieved, thereby forming longer acid-itched fractures and realizing in-depth stimulation and production enhancement. Early success has been obtained with the new gelled acid in fracturing high temperature carbonate reservoirs; it satisfied the needs of fracturing carbonate reservoirs with temperatures as high as 180℃. The gelled acid was planned to be further applied in more fracturing jobs.

     

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