Study And Application Of Blocking Technologies To Heavy Oil Thermal Recovery Of Henan Oilfield Gucheng Block

The target block is a high-salinity medium-temperature,medium-low permeability heavy oil reservoir.The main problem is the bottom water channeling caused by steam huff and puff,resulting in high water content of the produced liquid.In order to improve the high-water-cut production status of oil well,a new kind of lignin blocking agent has been researched and development.The mechanism of plugging has been discussed and researched,and discussed how the gelling result affected by p H,TDS,and temperature.Confirmed the best proportion to lignin and cross-linking agent by experimental research.Thermal stability testing and core displacement testing has also been researched to prove the properties of the system.The operation has been used in Chun II1-3-8H Well in target oilfield which has a strong bottom water channeling plugging,and the result of the operation is similarity to the research in lab.The period of validity has lasted 4 months,the accumulative oil production is 360 t,and the accumulative water decreasing is 1240.3t...