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- Title
耐高温泡沫树脂低伤害均匀固砂技术.
- Authors
匡韶华; 吕 民; 孙振宇; 胡 祎
- Abstract
In order to solve the problems of poor temperature resistance of conventional foam resin system, great damage to chemical sand solidification reservoir and short validity period in loose sandstone heavy oil reservoir of Liaohe oilfield, nano-modified resin base liquid was prepared by using epoxy resin, phenolic resin, hydrophobic nano-SiO2 and silane coupling agent as raw materials, and then adding curing agent, emulsifier, foaming agent, foaming stabilizer and other additives to prepare foam resin sand solidification system. The consolidation temperature, sand strength, permeability, temperature resistance and heterogeneous multilayer injection performance of the system were evaluated. A matching foam generator was developed, and then a high temperature resistant foam resin sand consolidation technology with uniform and low damage was formed. Finally, it was applied in Liaohe oilfield. The results showed that the optimum formula of the foam resin sand consolidation system was obtained as follows:20%—30% resin base solution, 8%—12% phenolic amine curing agent, 0.3% emulsifier OP-10, 0.5% foaming agent organic silicon surfactant, 0.1% solid foam stabilizer nano-SiO2, 0.1% polymer foam stabilizer polyethylene glycol, 57%—71% water. The foaming volume of the system was increased by 6 times, meanwhile the half-life was greater than 20 min. It could be cured above 35 ℃, and the temperature resistance after curing could reach 280 ℃, which had the characteristics of low temperature curing and high temperature resistance. The compressive strength of the foam resin solidified core at different temperature was more than 5 MPa, and the sand consolidation strength was high, which could meet the requirements of unconsolidated sandstone. The sand permeability of the consolidated core prepared with 0.25—0.42 mm quartz sand was 4.8 μm², which was better than that of conventional resin sand consolidation agent (1.9 μm²). It could prevent the penetration of highly permeable layer, improve the injection profile of sand consolidation agent, and achieve uniform sand consolidation. Good sand control results were obtained in the field test, which verified that the technology could achieve uniform sand consolidation and low damage characteristic. Using the fluid characteristics of foam resin to achieve uniform sand consolidation in heterogeneous multiple reservoirs, the purpose of improving the effect of chemical sand consolidation and the validity of sand control was achieved.
- Publication
Oilfield Chemistry, 2024, Vol 41, Issue 1, p53
- ISSN
1000-4092
- Publication type
Article
- DOI
10.19346/j.cnki.1000-4092.2024.01.008