Methods and devices for maximizing oil production for wells containing oil with high gas-to-oil ratio and oil extraction from oil rims of gas reservoirs

摘要

A novel passive flow restrictor attached outside the tubing in an oil well and positioned below casing perforations, causing fluid flow from an oil reservoir formation to at least partially flow through a narrow annular space between the flow restrictor and the casing before entering the tubing. The flow resistance is thereby defined in part by the length of the annular space, which is easily adjusted by lowering or raising the tubing within the casing. The flow restrictor and methods of using thereof are especially advantageous for maximizing oil production in thin oil rim gas reservoir as well as with other oil wells with high Gas-to-Oil Ratio.