Selective inflow controller and completion string containing it

Abstract

The invention provides a selective inflow controller and a well completion pipe string comprising the same. The selective inflow controller comprises a box-type controller main body, a flow guiding channel formed in an inner cavity of the controller main body and communicating with an inlet, a flow dividing channel communicating with the flow guiding channel, an accelerating flow jetting channel communicating with the flow guiding channel, a flow outlet channel communicating with the flow dividing channel and the accelerating flow jetting channel, and an outlet formed in the controller main body and communicating with the flow outlet channel, wherein the inlet is formed in the side wall of the box-type controller main body. An inlet of the flow dividing channel is formed between the inletand an inlet of the accelerating flow jetting channel, and the connecting position of the accelerating flow jetting channel and the flow guiding channel is smoother than the connecting position of theflow dividing channel and the flow guiding channel; and thus bottom water onrush due to 'heel end effect' and 'local high permeability' can be effectively prevented by using the controller, balancingof the inflow profile of a shaft can be kept advantageously, the water-free oil production period is prolonged, and the oil well yield is increased.

Description

technical field [0001] The present invention relates to oil and gas reservoir completion operations, and more particularly, to a selective inflow controller and a completion string comprising the same. Background technique [0002] In horizontal wells in bottom water reservoirs, there are common bottom water coning problems caused by "heel end effect" and "local high permeability of the reservoir". After the bottom water coning occurs in horizontal wells, the water cut increases rapidly, the production decreases significantly, and the oil well productivity is greatly affected. In order to solve the problem of bottom water coning, it is necessary to balance the inflow profile of the formation fluid along the wellbore to limit the wellbore inflow at the heel and high permeability zone. [0003] At present, the main methods of water control completion include variable-distance staged perforation completion, staged variable-density perforation completion, central tube completio...

AI Technical Summary

Problems solved by technology

However, the existing AICD still has problems such as low fluid recognition accuracy, unstable performance, complex structure, and difficult processing.

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