Volume 43 Issue 2
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XU Bingwei.Study and application of the mechanism of reducing sandstone reservoir damage by hpg with repair agent[J]. Drilling Fluid & Completion Fluid，2026, 43（2）：272-279 doi: 10.12358/j.issn.1001-5620.2026.02.016
Citation: XU Bingwei.Study and application of the mechanism of reducing sandstone reservoir damage by hpg with repair agent[J]. Drilling Fluid & Completion Fluid，2026, 43（2）：272-279 doi: 10.12358/j.issn.1001-5620.2026.02.016
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Study and Application of the Mechanism of Reducing Sandstone Reservoir Damage by HPG with Repair Agent

doi: 10.12358/j.issn.1001-5620.2026.02.016

  • North China Oil and Gas Branch, Sinopec Corporation, Zhengzhou, Henan 450000

  • Received Date: 2025-11-01
  • Rev Recd Date: 2025-12-25
  • Publish Date: 2026-04-08
    Abstract
  • In sandstone reservoir hydraulic fracturing operation, the adsorption and retention of hydroxypropyl guar gum (HPG) on the surfaces of reservoir rocks cause significant formation damage which requires an urgent solution. It is decided, based on laboratory study, that a repair agent should be used to mitigate the formation damage by HPG and hence to improve the effect of sandstone reservoir fracturing. Using spectroscopy technology, the quantity of HPG adsorbed and retained in sandstones can be quantitatively studied, and using NMR technology, the effect of the repair agent on reducing formation damage by HPG can be characterized. Based on these studies, the optimum quantity of the repair agent to be used was determined, and the effects of temperature and retention period on the performance of the repair agent were investigated. Using X-ray photoelectron spectroscopy, SEM and contact angle measurement, the mechanisms of the repair agent to mitigate formation damage by HPG were revealed. The results of the study show that the optimum concentration of the repair agent is 3000 mg/L, and the formation permeability damage is reduced by 29.31%. Temperature has a relatively low effect on the performance of the repair agent. The effect of the repair agent on reducing formation damage first decreases and then increases with the time of HPG retention on the surfaces of the sandstones. Through hydrogen-bond inhibition, preferentially occupying adsorption sites and increasing interface contact angles, the repair agent mitigates the retention of HPG in sandstone reservoirs. The field application of the repair agent in Hangjinqi block showed that the concentrations of the guar gum in the waste fracturing fluids from wells treated with the repair agent were significantly increased, and the oil production was significantly increased and stabilized for a longer time. The results of the study provide technical support to the efficient development of sandstone reservoirs.

     

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