A method for inversion of dynamic connectivity between wells of a multilayer reservoir

Abstract

The invention discloses a method for inversion of dynamic connectivity between wells of a multi-layer reservoir. The method includes: establishing a dynamic connectivity model between wells of the multi-layer reservoir according to the perfection degree of the field existing monitoring data and the shut-in condition, and in particular providing different solutions for different shut-in reasons; adopting a simulated annealing particle swarm algorithm to solve the model, and optimizing the dynamic connectivity coefficient and time constant to make the predicted results coincide with the actual production performance, and realizing the inversion of the dynamic connectivity coefficient between injection and production wells and the longitudinal splitting coefficient of oil and water wells in each layer of reservoir. The method has the advantages of fully utilizing the existing field monitoring data, fully considering the actual fluid volume and pressure change in the reservoir field and the well shutdown problem, is high in accuracy and applicability, and has important reference values for the implementation of stimulation measures in the high water cut oilfield.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field development, and relates to a dynamic connectivity inversion method between wells in multi-layer oil reservoirs in consideration of incomplete monitoring data and shutting down wells. Background technique [0002] At present, most oilfields in my country have entered the development stage of high water cut and ultra-high water cut. Due to reservoir heterogeneity, fluid mobility differences, and injection-production differences, etc., water flow dominant channels have gradually formed in the reservoirs, resulting in low efficiency of injected water. The cycle is severe, and the formation water storage rate decreases, which seriously affects the water flooding development effect. At present, the methods used to analyze the dynamic connection between injection and production wells mainly include: interwell tracer method, well-ground potential method, microseismic method and well testing meth...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the current dynamic connectivity model between wells in multi-layer reservoirs is only suitable for constant liquid or constant pressure production, and cannot consider the change of liquid volume and pressure with time, cannot use existing monitoring data, and cannot process Provide a highly accurate and applicable inversion method for dynamic connectivity between wells in multi-layer reservoirs

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