Volume 35 Issue 2
Mar.  2018
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ZHANG Liping, ZHANG Lu, LAN Xitang, LIU Changlong, ZOU Jian, GAO Shang. Application of Non-acid Block Removing Technology in Bohai Oilfield[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(2): 116-121. doi: 10.3969/j.issn.1001-5620.2018.02.019
Citation: ZHANG Liping, ZHANG Lu, LAN Xitang, LIU Changlong, ZOU Jian, GAO Shang. Application of Non-acid Block Removing Technology in Bohai Oilfield[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(2): 116-121. doi: 10.3969/j.issn.1001-5620.2018.02.019

Application of Non-acid Block Removing Technology in Bohai Oilfield

doi: 10.3969/j.issn.1001-5620.2018.02.019
  • Received Date: 2017-10-05
  • Publish Date: 2018-03-30
  • A non-acid block removing fluid has been developed to deal with several problems encountered in the development of unconsolidated sandstone reservoirs in Bohai oilfield. The problems include failure of rock matrices in conventional acidizing job, secondary precipitation caused by residue acids that are unable to timely flow back because of the limits from configuration of pipe string and workover jobs, and flowback fluids with high electric conductivity that cannot be directly disposed of. All these problems pose serious restrictions on reservoir acidizing operations. The newly developed non-acid block removing fluid is also able to protect the reservoir from being damaged. The residue of this non-acid block removing fluid has lower electric conductivity. The non-acid block removing fluid, containing 20% compound polycarboxylic chelating agent A and 5% fluorine complex C, can slowly release H+ and F-, and maintain its pH value between 6 and 7, showing high retarding property and capability of protecting rock matrices. By chelating metallic ions, scales are prohibited and secondary precipitation is minimized. The non-acid block removing fluid has low corrosivity, and the flowback fluid has low ionic concentrations and electric conductivity, which are beneficial to the on-the-spot and efficient disposal of the flowback residue acid in the platform process. This non-acid block removing fluid has been tried out in Bohai oilfield with remarkable efficiency, showing good application prospect.

     

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