Research And Application Of Oil Well Protection Technology For Production Wells In Ludong Oilfield

Formation damage control is a strategic problem in field exploration and development and it is also an important measure of improving the well productivity.The reservoir in the Jidong oil field is low porosity and low permeability reservoir,and the reservoir sensitivity is strong,and the entry fluid is easy to leak into the stratum,which can cause reservoir damage during the production process.The formation water of the operating area has high HCO3-,CO32-,Ca2+and Mg2+ is easy to cause precipitation and scaling.In the case of loose cementation,there may be strong stress sensitivity,so the invasion of foreign fluid may cause greater damage to the reservoir.Based on the characteristics of deep reservoirs in the Jidong oil field,this paper analyzes the potential reservoir damage factors and analyzes the basic performance test of the commonly used wells in onshore oil fields.On this basis,the antipollution string technology is improved and combined with the well fluid evaluation experiments,the formation of form a complete set of reservoir damage control technology,the research results of application effect is remarkable,basically met oilfield downhole operation and production management of the reservoir protection requirement,for the jidong oilfield stable yield and improve reservoir recovery efficiency has important strategic significance.The main achievements of this paper are as follows:(1)By classifying physical property data of the the main reservoir,and study analysis of reservoir mineral composition,clay content,porosity,permeability,fluid properties,temperature,pressure,and combined with the reservoir simulation study,the potential damage factors of reservoir is determined.(2)This paper discussed the five aspects about the well liquid composition,pH value,the total salinity,liquid surface/interfacial tension,distribution of solid phased particles and solid phase particles,and combined with the core damage evaluation experiment for oilfield are commonly used in completion fluid system evaluation,for the optimization of the region into the well liquid provides a good guidance.(3)By testing the ability of the commonly used in-flowing fluid,and damage evaluation experiment,has been clear about the reservoir protection performance and the main technical measures of protection for different reservoir.