Preparation and evaluation of an oil-soluble mixed-resin temporary plugging agent for high-temperature and high-salinity carbonate reservoirs

doi:10.3969/j.issn.1006-6535.2026.04.022

Abstract

Abstract: Carbonate reservoirs in the Tahe Oilfield are characterized by high temperature,high salinity and high acidity.Conventional temporary plugging agents show poor stability and insufficient strength,and that are difficult to meet the requirements of such reservoirs.In response to this,an oil-soluble mixed-resin temporary plugging agent was prepared using maleic anhydride modified petroleum resin as the main raw material,and compounding rosin-modified phenolic resin,terpene resin,and epoxy resin.The formulation was optimized and its performance was evaluated.The results show that the optimal formulation is 81.67% modified C₉ petroleum resin+6.77% rosin-modified phenolic resin+8.72% terpene resin+2.84% epoxy resin.Under extreme conditions of 140 ℃,salinity of 21×10⁴ mg/L,and 5.00% hydrochloric acid,the temporary plugging agent still maintains excellent stability,with a breakthrough pressure exceeding 10 MPa.Meanwhile,it exhibits oil-water selectivity of plugging upon water contact and unplugging upon oil contact;after plugging,the reservoir permeability recovery exceeds 93.0%.A pilot field test in Well X in the Tahe Oilfield shows that after application of this temporary plugging agent,the water-free oil production period is extended by 20% compared with nearby wells,water cut decreases from 82% to 18%,and daily oil production increases from 3.5 t to 12.8 t,indicating significant water control and oil increase effects.This study successfully addresses the bottleneck of temporary plugging technology for high-temperature and high-salinity carbonate reservoirs,and can provide technical support for efficient water-control development of fractured-vuggy carbonate reservoirs.

Key words: high temperature and high salinity, carbonate rocks, fractured-vuggy reservoir, temporary plugging agent, Tahe Oilfield

CLC Number:

TE357

Dong Xiumin, Fang Jing, Feng Xin'gen. Preparation and evaluation of an oil-soluble mixed-resin temporary plugging agent for high-temperature and high-salinity carbonate reservoirs[J]. Special Oil & Gas Reservoirs, 2026, 33(4): 168-174.

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