Volume 39 Issue 1
May  2022
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LIU Jing, YU Yangyang, YU Menghong, et al.Preparation and performance study of an adsorptive retardant for acid job[J]. Drilling Fluid & Completion Fluid，2022, 39（1）：92-99 doi: 10.12358/j.issn.1001-5620.2022.01.016
Citation: LIU Jing, YU Yangyang, YU Menghong, et al.Preparation and performance study of an adsorptive retardant for acid job[J]. Drilling Fluid & Completion Fluid，2022, 39（1）：92-99 doi: 10.12358/j.issn.1001-5620.2022.01.016
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Preparation and Performance Study of an Adsorptive Retardant for Acid Job

doi: 10.12358/j.issn.1001-5620.2022.01.016
  • 1.

    Drilling and Production Technology Research Institute, Jidong Oilfield Company, PetroChina, Tangshan, Hebei 063002

  • 2.

    Key Laboratory of Nano Chemistry，CNPC，Beijing 100083

  • 3.

    College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu，Sichuan 610500

  • Received Date: 2021-10-12
  • Accepted Date: 2021-12-02
  • Rev Recd Date: 2021-11-20
  • Publish Date: 2022-05-06
    Abstract
  • Acid job has long been faced with a series of problems such as fast acid – rock reaction, difficulties in flowing back the residue acids as well as high secondary formation damage etc. To deal with these problems, an adsorptive retardant for acid job was developed through emulsion polymerization with raw materials such as allyl polyoxyethylene ether (APEE), an ester monomer EX and acrylamide (AM). The optimum reaction condition for the synthesis reaction obtained through single-factor optimization is as follows: m(AM)∶m(APEE)∶m(EX) = 10.66∶1.05∶0.17, the total mass fraction concentration of the monomers is 15%, the mass fraction concentration of the initiator 0.25%, the reaction temperature 50 ℃, and the reaction time 6.0 h. The molecular structure of the retardant was characterized with IR spectroscopy and studies were done on the effects of several factors, such as the concentration of the retardant in acid, temperature and concentration of calcium salts, on the retardant’s ability to retard the acid – rock reaction. It was found in the studies that when the mass fraction concentration of the retardant is 0.8%, the acid – rock reaction time can be extended to 120 min. The retardant was able to show good retarding performance at 70 ℃. The retarded acid prepared with the retardant has excellent resistance to calcium salts. SEM observation has shown that the retardant is adsorbed on the surfaces of the rocks, effectively retarding the contact of the hydrogen ions with the surfaces of calcium carbonate rocks and hence reducing the reaction rate between the acid and the rocks.

     

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