Finite state simulation method and system for offshore oilfield complex well control

Abstract

The invention relates to a finite state simulation method and system for offshore oilfield complex well control, and the invention is characterized in that the method comprises the following steps: 1)building a topological structure of a current production unit in a to-be-measured offshore oilfield, and defining that the same level of the topological structure comprises a single well and a well group; 2) setting the control state of the current production unit topological structure, and calculating the yield and pressure of the production unit topological structure in the current control state; 3) detecting the control state of the topological structure of the current production unit according to predefined active and passive control rules and state conversion parameters; 4) recalculatingthe yield and pressure of the topological structure of the current production unit; and 5) entering the step 3) to update the control state of the topological structure of the current production unituntil the control state of the topological structure of the current production unit does not change any more, and entering the step 1) to calculate the next production unit. The method can be widelyapplied to the field of oil and gas field development and recovery ratio improvement.

Description

technical field [0001] The invention relates to a finite-state simulation method and system for complex well control in offshore oilfields, and belongs to the field of oil reservoir numerical simulation technology application and oil-gas field development enhancement of recovery. Background technique [0002] Different from onshore oilfields, offshore oilfields rely on offshore platforms to extract crude oil from reservoirs to platforms, through sea pipes, risers, etc., to extract crude oil to the ground. The well control method has also become very complicated. If reservoir numerical simulation is used to simulate such problems, it is first necessary to solve the numerical simulation of complex well control. The accuracy of numerical simulation in offshore oilfield applications, however, there is no simulation method for complex well control in offshore oilfields in the prior art. Contents of the invention [0003] In view of the above problems, the object of the presen...

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Problems solved by technology

[0002] Different from onshore oilfields, offshore oilfields rely on offshore platforms to extract crude oil from reservoirs to platforms, through sea pipes, risers, etc., to extract crude oil to the ground. The well control method has also become very complicated

If reservoir numerical simulation is used to simulate such problems, it is first necessary to solve the numerical simulation of complex well control. The accuracy of numerical simulation for offshore oilfield applications, however, there is no simulation method for complex well control in offshore oilfields in the prior art

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