Preparation of a supramolecular sand-inhibiting and water-control agent and study of its applicability to oil reservoirs

Abstract

To solve the problem whereby an oil reservoir with applicable boundaries of the current sand-inhibiting and water-control agent is unclear, a supramolecular sand-inhibiting and water-control agent PDKM was prepared using acrylamide (AM), methacryloxyethyltrimethyl ammonium chloride (DMC), styrene (SM), and γ-methacryloyloxypropyltrimethoxysilane (KH570) as comonomers. The molecular structure of PDKM was verified by ¹H-NMR and FT-IR. On the basis of establishing an evaluation method that can screen the performance of sand-inhibiting agent at a flow rate of 100 mL/min, the oil reservoir applicable boundaries of PDKM were obtained through the evaluation of sand-inhibiting and water-control performance. The experimental results show that when the concentration of PDKM is 5000 mg/L, the oil reservoir conditions are temperature ≤ 90 °C, formation water salinity ≤ 21,249 mg/L, the degree of sand production corresponding to slight sand production and particle migration, crude oil viscosity ≤ 50 mPa·s, primary water flooding water cut ≥ 75%, and formation permeability contrast ≤ 2. The performance with respect to sand inhibiting and water control can all reach an excellent level. Therefore, the PDKM solves the problem whereby the applicability of the current sand-inhibiting and water-control agent is unclear, and provides direction for the selection of suitable products in the oilfield production site.

Keywords

Supramolecular polymer / Synthesis / Sand inhibition and water control / Oil reservoir application boundaries

CRediT authorship contribution statement

Tianmeng Lei: Writing-original draft, Methodology, Investigation, Formal analysis, Conceptualization. Yefei Wang: Writing-review & editing. Mingchen Ding: Software, Project administration. Wuhua Chen: Software, Formal analysis. Zhenye Yu: Software, Project administration. Zhixue Huang: Formal analysis. Motorova Kseniya Alexandrovna: Visualization, Validation, Software, Resources.

Declaration of competing interest

The authors declare that they have no conflict of interest.

Acknowledgements

This work was supported by the National Natural Science Foundation of China (General Program) (Grant No. 52474071) and the Provincial Key R&D Program of Shandong (2022CXGC020303). The authors appreciate the financial support from the China Scholarship Council (TM Lei, Grant No. 202406450004).

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