Volume 39 Issue 6
Nov.  2022
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ZHANG Zhaoyang, CHEN Yuemei, BAO Jin, et al.Study on supramolecular gel temporary plugging agent for shale gas reservoir fracturing[J]. Drilling Fluid & Completion Fluid，2022, 39（6）：767-775 doi: 10.12358/j.issn.1001-5620.2022.06.016
Citation: ZHANG Zhaoyang, CHEN Yuemei, BAO Jin, et al.Study on supramolecular gel temporary plugging agent for shale gas reservoir fracturing[J]. Drilling Fluid & Completion Fluid，2022, 39（6）：767-775 doi: 10.12358/j.issn.1001-5620.2022.06.016
shu

Study on Supramolecular Gel Temporary Plugging Agent for Shale Gas Reservoir Fracturing

doi: 10.12358/j.issn.1001-5620.2022.06.016
  • 1.

    CNPC Chuanqing Drilling Engineering Company Limited, Chengdu，Sichuan 610051

  • 2.

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

  • Received Date: 2022-08-01
  • Rev Recd Date: 2022-09-05
  • Publish Date: 2022-11-30
    Abstract
  • A supramolecular gel temporary plugging agent suitable for use in shale gas reservoirs of 90-110 ℃ was developed based on the principle of supramolecule chemistry. It has several advantages such as adjustable stable time, high strengths and ease of being removed. These advantages make it suitable for temporarily plugging micro-fractures and deep fractures.The new temperature-responsive supramolecular gel temporary plugging agent SCD12 was developed with β-CD as the host and SES as the guest, as well as other additives. Characterization of SCD12 shows that there is a supramolecular action among different components of the plugging agent. SCD12 was tested for the weight of residue after gel breaking, compatibility, rheology and temporary plugging performance. These experiments show that SCD12 is in a liquid form in room temperature and has low viscosity and hence good pumpability. At elevated temperatures, SCD12 can quickly plug fractures. SCD12 can effectively plug fractures in a certain temperature range even after gel breaking which results in viscosity reduction. The dynamic plugging capacity of SCD12 is 168.06 MPa·m-1. Percent permeability loss of a rock sample by SCD12 is 9.3%. These advantages of SCD12 satisfy the needs of temporary plugging in diverting fracturing of shale gas reservoirs, and make SCD12 a new promising temporary plugging agent.

     

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