Volume 42 Issue 1
Feb.  2025
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CUI Bo, RONG Xinming, FENG Puyong, et al.A single phase acid for one step removal of organic deposition and inorganic scale[J]. Drilling Fluid & Completion Fluid，2025, 42（1）：134-142 doi: 10.12358/j.issn.1001-5620.2025.01.015
Citation: CUI Bo, RONG Xinming, FENG Puyong, et al.A single phase acid for one step removal of organic deposition and inorganic scale[J]. Drilling Fluid & Completion Fluid，2025, 42（1）：134-142 doi: 10.12358/j.issn.1001-5620.2025.01.015
shu

A Single Phase Acid for One Step Removal of Organic Deposition and Inorganic Scale

doi: 10.12358/j.issn.1001-5620.2025.01.015
  • 1.

    COSL Production Optimization Department, Tianjin 300450

  • 2.

    Institute of Unconventional Oil and Gas Science and Technology, China University of Petroleum (Beijing), Beijing 102249

  • Received Date: 2024-09-05
  • Accepted Date: 2024-10-08
  • Rev Recd Date: 2024-10-08
  • Publish Date: 2025-02-01
    Abstract
  • The deposition of organic and inorganic scales in the near wellbore zone seriously affects the normal production of oil and gas. Conventional blockage removal systems cannot simultaneously remove organic, inorganic, and their mixed scales. A new multifunctional unblocking system, single phase acid, has been developed to solve the above issues. The system consists of two immiscible liquids (aromatic solvent for organic scale and acid solution for inorganic scale), surfactants, cosurfactants, and functional additives. The performance of single phase acid system was systematically analyzed and evaluated using experimental instruments such as rotary rock disk analyzer, conductivity meter, particle size analyzer, interfacial tension meter, wetting angle tester, friction meter, core flow meter, CT scanning, etc. The experimental results show that the single phase acid is a nano homogeneous dispersion system with an external phase of oil and an internal phase of acid, with a particle size distribution of 7-50 nm;The interfacial tension is 0; It has the performance of relieving reservoir emulsification (demulsification rate greater than 90%), water locking, and wetting modification (oil wet modification to water wet); it can simultaneously dissolve organic scale, inorganic scale, and their mixed scale (dissolution rate 100%); low friction resistance (lower resistance rate greater than 80%), and can achieve large injection rate operations; It has high retarded rate (retarded rate greater than 99%) and can achieve deep depth of reservoirs. Single phase acid utilizes the principle of mutual solubility between oil and acid to achieve the simultaneous dissolution of organic scale, inorganic scale, and their mixed scale in a one step. It is of great significance for the efficient removal of mixed scale pollutants in the near-well area of oil and gas Wells and transfer Wells. Single phase acid system has been carried out field test in Missan Oilfield in Iraq, and get good stimulation result.

     

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