Method for treating oil field produced water and treatment flow thereof

Abstract

The invention discloses a method for treating oil field produced water in the petroleum industry and a treatment flow thereof for treating the oil field produced water and making the produced water meet the re-injection requirement. The treatment method comprises the following steps of: treating the oil field produced water by using a pre-oxidation treatment device, putting an agent between a primary oil removal tank and a secondary settlement tank, filtering the oil field produced water by using a micropore ceramic granular filter material and then delivering the filtered oil field produced water. The primary oil removal tank, the secondary settlement tank, a delivery tank and a delivery pump are adopted in the treatment flow and connected by adopting pipelines; the front end of the primary oil removal tank is connected with the pre-oxidation treatment device; a coagulation reactor is connected between the primary oil removal tank and the secondary settlement tank; and the tail end of the flow is connected with a ceramic filter tank. The treatment method can solve the problems of corrosion and scaling of the oil field produced water so that the water quality of the treated injection water comprehensively and stably reaches the standard. The treatment method generates a small amount of mud, and greatly reduces the subsequent treatment cost.

Description

technical field [0001] The invention relates to a treatment technology for produced water in the petroleum industry, in particular to a treatment method for produced water in an oil field and a treatment process thereof, which are used to treat the produced water in the oil field so that the produced water can meet the requirement of reinjection. Background technique [0002] At present, there are many kinds of treatment processes for oilfield produced water. Due to the large difference in produced water quality, there are many types of treatment processes. According to the characteristics of different raw water quality and purification treatment requirements, according to the main treatment process, they can be roughly divided into: [0003] (1) Gravity-type oil collection+sedimentation+filtration, supporting dosing of "three defense" chemicals and other auxiliary treatment processes; the process is as follows: water from the oil station → dosing → primary oil removal tank →...

AI Technical Summary

Problems solved by technology

[0009] (1) The ions that are unstable and cause corrosion and scaling in the water are not fundamentally removed, and the purification problem of the produced water cannot be solved. The main water quality indicators such as oil content, suspended solids, and corrosion rate in the water exceed the standard, and cannot meet the needs of oilfield water injection;

[0010] (2) The water injection system is severely corroded and scaled;

[0011] (3) The water quality continues to deteriorate along the process, seriously affecting the oilfield water injection development effect and economic benefits

Images