OIL WELL, METHOD FOR OIL EXTRACTION FROM THE WELL AND METHOD FOR CONTROLLABLE FLUID INJECTION INTO FORMATION THROUGH THE WELL Russian patent published in 2005 - IPC

FIELD: oil production industry, particularly to perform fluid flow control during oil extraction process.

SUBSTANCE: well has casing pipe with a plurality of perforated sections and production string located inside casing pipe. Alternating current source electrically linked with at least one of casing pipe and production string is located on ground surface and serve to conduct alternating current from ground surface into well through casing pipe or production string. Controlled well section is also provided. Controlled well section includes communication and control unit electrically linked with at least one of casing pipe and production string and having sensing means and electrically operated valve connected thereto. Communication and control unit is adapted to regulate flow between outer and inner production string parts at least partly in accordance with sensing means measurements. To extract oil a number of controlled well sections are provided. Some controlled well sections have flow limiter retarders located around production string part to prevent fluid flow between controlled well sections. Fluid characteristic is measured in each controlled well section and fluid flow is regulated on the base of performed measurements at least in one controlled well section with the use of valves. Then oil is extracted from well through production string. Fluid injection is performed along with control fluid flow from inner production string part to outer one with the use of above method, wherein each controlled well section is provided with above flow retarder. Packer or electrically operated packer comprising electrically operated valve or expanded production string part or sleeve located around production string in perforated casing pipe section may be used as the flow retarder. Flow, pressure or fluid density transducers or acoustic signal converter may be used as the sensing means.

EFFECT: provision of dynamic oil extraction process control for optimization thereof.

32 cl, 6 dwg, 3 ex