Research On The Standard Of Quality Of Output Water For Reinjection In HH Oilfield Ch8 Reservoir

The reserves of low permeability reservoir takes a high propotion of proved reserves in China.At present,the development of low permeability reservoirs in China still uses the conventional waterflooding method.In order to obtain the ideal water injection development effect,and to optimize the water injection technology,it is necessary to realize the decisive role of injecting water quality into the development of waterflooding.Therefore,to optimize the water injection development in low permeability reservoirs,we must study the water quality index first.According to the practice of oilfield construction,the indicators identified in the current industry standard are very strict.Under the condition of existing water quality treatment technology,it may require higher economic cost to carry out injection water quality according to the water quality standard recommended by industry standard.In addition,due to the different geological conditions of low permeability reservoirs in various fields,we still need to determin more suitable standard of quality of injection water for different fields which according to the formation character of the fields.The average permeability of Ch8 reservoir in HH oilfield is 0.4mD,It belongs to ultra-low permeability reservoir.In the process of water injection development,the domestic ultra-low permeability reservoir represented by Ch8 reservoir should have more detailed and directivity index requirements for the injected water quality.The study on the water quality standard of the injected water for the C8 reservoir in HH oilfield is divided into the following:(1)Investigate and analyze the characteristics and potential damage factors of Ch8 reservoir in HH oilfield.(2)Analyze the compatibility between the injected water and Ch8 reservoir.(3)Study the Experiment of the corrosive evaluation by injected water;(4)Using core displacement experiment,determin the value of main control indexes of suspended particle size,suspended matter content,oil content and bacteria content.The results of experiment provides a concrete basis for the quality standard of injection water for Ch8 reservoir in HH oilfield.It also provides a reference for water injection quality study in similar block.