Analysis of chemical characteristics of water in the formation of the Sudong area

Abstract

In Sudong area, the relationship between gas and water is complex and the hydrochemical characteristics of formation water is unclear, therefore, site managers are eager to figure out the formation water properties and its distribution characteristics in Sudong gas reservoir. In this paper, based on the analytical data of formation water, we studied the type of formation water, the chemical characteristics of produced water, and the hydrochemical characteristics coefficient. The results showed that the water produced in the south and north is formation water and the middle is condensate water; the fracturing fluid is discharged at the early stage of the gas well production, and the formation water is gradually produced in the later stage; the salinity is high in the southwest and lower in the northeast; the water storage condition in the southern formation is higher than that in the north; the time of the water and rock action in the southern area is stronger than that in the north, and from the perspective of oil and gas preservation, the south is better than the north. The research would have a great significance for improving the understanding of formation water in the Sudong block and guiding the rapid and efficient development of the gas field.