Identification method for dynamic association degree of chemical flooding injection production wells

Abstract

The invention discloses an identification method for dynamic association degree of chemical flooding injection production wells. The identification method for the dynamic association degree of the chemical flooding injection production wells includes that (1) simultaneously recording an actual chemical agent injection concentration value of an injection well and an actual chemical agent output concentration value of each production well according to a time interval t during the time period T from the chemical agent injection to the test starting; (2) fitting the actual chemical agent output concentration value of each production well according to the actual chemical agent injection concentration value and a calculated chemical agent output concentration value of each production well to obtain dynamic association indexes of the injection well connected with each production well in the well group; (3) drawing a chemical flooding inter-well dynamic association graph; (4) calculating variable coefficients of dynamic association indexes, and confirming the chemical flooding inter-well dynamic association type. The identification method for the dynamic association degree of the chemical flooding injection production wells fully uses the dynamic information of the oilfield injection production wells, the data are easy to acquire, the operation is easy to perform, and the application is broad; the identification method provides the basis for identifying the fluid channeling situation of chemical agent solution in the stratum, guiding the production allocation, injection allocation, profile control and water plugging of each chemical flooding injection production well and the like.

Description

technical field [0001] The invention relates to a method for identifying the dynamic correlation degree of chemical flooding injection and production wells, and belongs to the technical field of oil recovery in oilfields. Background technique [0002] Chemical flooding is an important method to enhance oil recovery in my country. Injecting chemical agent solutions such as polymers can improve reservoir heterogeneity to a certain extent, but the chemical agent solution will still break through along the high permeability bands in the formation. Reduce displacement efficiency. According to the injection-production performance of the injection and production wells in the block, the dynamic correlation degree between wells is calculated, and the channeling of the chemical flooding solution in the ground is identified. Significance. [0003] At present, the commonly used research methods of dynamic correlation between injection and production wells mainly include pressure test m...

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Problems solved by technology

The above methods are costly, difficult to obtain data, complex in technology, and time-consuming, seriously affecting the normal production of oilfields

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