A Selection and Application of the Sewage Treatment Agents of Shallow and Low Permeability Reservoir in the North of Shaanxi Province

Water injection development is the main mode to improve the ultimate recovery and benefit of Shallow and Low Permeability Reservoir in the North of Shaanxi Province.With the development,the oil field waste water has become the main water source of the injection development.The Sewage treatment,re-injected and cycle utilization is one of the key problems for sustainable development of oil fields.In order to find an appropriate agent type and dosage for the Shallow and Low Permeability Reservoir in the North of Shaanxi Province,several tests were carried out on the doffing and pool sewages in Nanniwan oilfield.The results show that the various kinds of water treatment agents can work well with a good compatibility,The application of this system to dispose the sewage reveals that the content of oil and impurity in the disposed water has reached the rejection standard of Yanchang oilfield,which can meet the demand of Water injection development of Low Permeability Reservoir in Nanniwan oilfield.The results can provide a theoretical basis for sewage treatment and water injection optimization of shallow and low permeability oil fields in North Shaanxi.