利用储层成垢离子物源实现优势通道调整提高水驱效率

In order to solve the negative influence of the high salinity of formation water on the performance of the deep liquid flow divertring agent in the CaCl₂ water type oilfield, reduce the cost of the steering agent, and then achieve the purpose of reducing the cost and increasing the efficiency, the gel performance, plugging and diverting performance and field application of a composite silicate microgel diverting agent OMGL, synthesized by a variety of inorganic materials through special processes, in the CaCl₂ water type formation water was discussed. The diverting agent OMGL reacted with Ca²⁺ and Mg²⁺ in high salinity formation water (injected water). The gelation reaction of 0.6%OMGL in oil field water completed within 12-24 h at room temperature. With the increase of OMGL concentration, the gelation degree of the system increased and the gelation degree of the 3%OMGL+1%CaCl₂ aqueous solution system was 100%. The microgel with particle size of 0.05-2 μm was formed by the gel reaction of OMGL with Ca²⁺ and Mg²⁺ in the formation water, which was difficult to enter the low permeability microporous matrix, and a stable microgel coating was formed through the -Si-O-Si- bond on the surface of the rock skeleton of the dominant channel. The diverting agent OMGL was ideal for plugging the core with a permeability ratio of 10~50 times. This kind of diverting agent had been carried out in the field experiments with different temperatures and different salinity conditions at home and abroad, the effect of the enhancement of oil recovery of water flooding was good, the water injection pressure increasing by 2-3 MPa, and the oil increasing effect being good and the effective period being over 1 years.