Foam+resin based sand consolidation technology for low-temperature thin oil reservoir in Chunguang Oilfield

In this paper, the foam+resin based sand consolidation system was developed to deal with the serious fine siltstone production of the oil production wells in the low-temperature thin oil reservoirs of Chunguang Oilfield. In the experiment, the modified melamine formaldehyde resin was used as the raw material, the mass fractions of solidifying agent, foaming agent, foam stabilizer and other compositions were determined by taking compression strength and permeability as the indicators, the influences of gas/liquid volume ratio and reaming mode on the consolidation performance were investigated, and thus the foam+resin based sand consolidation system was developed. In addition, the solid consolidation depth was determined by means of back scour experiment. It is experimentally indicated that the foam+resin based sand consolidation system which takes N₂ as the gas phase, SDS as the foaming agent, CMC as the foam stabilizer and mixed acid salt and organic acid as the solidifying agent is characterized by low density, high strength and high permeability. At the temperature of 25 ℃, the consolidation body has density of 0.54-0.62 g/cm³, compression strength of 6.12 MPa and permeability of 1.76 μm². By December 2020, the foam+resin based sand consolidation technology had been tested on site 27 well times in Chunguang Oilfield and the pump detection period is extended from 35 d to 112 d, indicating good sand control effects.