Oil Wells In Low Permeability Reservoir Stimulation By Injection Technology Research And Application

China's oil demand is increasing year by year,but the oil recovery is not high,the development process waste is very serious.Water injection wells usually the way of development,the average recovery rate is not high,reserves of about 2/3 of the failed mined,and low permeability oil field,block oil,heavy oil recovery even lower,thereby increasing oil the recovery is a very important job,but also an effective way of saving oil resources.So the demand for oil is very strong and efficient mining techniques.In the high-water oil fields," three high and two low " phenomenon highlights that reserve-production ratio is low,the low recovery rate,integrated with high moisture content,high degree of recovery,oil recovery rate is high,but there is still more residual oil left in the ground these residues for enhanced recovery of oil reserves is of great significance.According to statistics,if the recovery of the world's oil fields increased by 1%,representing an increase of 2 to 3 years of global oil production.Therefore,high water oilfield EOR has very important significance.Effective technology in low permeability oil and gas development has water,fracturing,steam injection,etc.,fine reservoir description and protection is a key reservoir development.Horizontal well technology,three-dimensional seismic imaging,and crack crack diagnostic techniques,new fracturing technology,such as steam injection EOR rapid development of emerging technologies,low-permeability oil and gas field development of foreign technology is improving daily.Gaosheng oil is rich in low-permeability oil and gas resources,has great potential for development.In recent years,oil wells in low permeability reservoir stimulation by injection technology worked out a set of complementary technologies.Gaosheng oil field is one of the Liaohe oilfield development earlier,had taken over the conventional cold production,water injection development mode,and carry off steam flooding,water flooding and other tests,but due to the impact of geology,technology and other factors,and more second way to convert the test results were not satisfactory,so the field is still developing water-based,low-yielding inefficient state is currently in the overall field development,the urgent need to develop ways to convert.Gaosheng oil field water blocks are mainly Niuxintuo oil,Lei blocks.Niuxintuo oilfield construction located on the western sag,Liaohe rift northern end of the western slope,the next layer is developed to Cenozoic third SHAHEJIE four Niuxintuo reservoir and theArchaean oil,heavy oil block belonging to the deep;mine house blocks are located in the eleventh grade,three districts in southern,developed to layer lotus oil,light oil blocks belonging.Each block has gone through all the exploitation of natural energy,water temperature development in two phases.Gaosheng oil field water block for the low permeability reservoir,reservoir characteristics determine its vulnerable clogging.Effective way to improve the low-permeability oil production is to implement measures to increase production,but poor current conventional fracturing,acidizing,water and other stimulation effects.Resulting in a low-yielding single well often inefficient state.In this paper,the mechanism of formation damage were studied,analyzed the reasons for the low yield and low permeability oil fields.Block Gaosheng oil field water reservoirs poor physical properties,low permeability,typical of low permeability reservoir.More sensitive to external contamination reservoir fluid produced,once the pollution clogging,will further significantly reduce reservoir permeability,thus significantly reducing the near wellbore conductivity,appear significantly reduce well productivity,high pressure water injection wells injecting difficult problem.In addition,Gaosheng oil reservoir contamination blocked numerous factors,including the presence of major oil flushing fluid,workover fluid leakage and long soak drilling mud clogging generated mainly injection wells workover fluid leakage and injected water quality failure,and formation pollution due to poor compatibility of clogging.Clogging types targeted for plugging diversity and adaptability of technology put forward higher requirements,increase the difficulty of understanding blocking work.In response to these problems,carried out by injection of oil wells increase technology research and support.And to determine the integrated plugging and increase yield and injection technology roadmap,finally,oil wells yield water block by injection technique by Gaosheng oil region in field trials and applications to adapt to the characteristics of different blocks and different types of pollution solution has formed a series of supporting blocking technology to solve a similar problem hypotonic block pollution clogging,opened up a new way.