METHOD FOR FIELD PREPARATION OF OIL-CONTAINING FORMATION MIXTURE AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2023 - IPC B01D17/25 B01D17/04 

FIELD: oil and gas industry.

SUBSTANCE: invention is related to separation of the produced reservoir mixture into oil and gas, and polluting components. A method for field preparation of an oil-containing reservoir mixture is disclosed. The method includes gravitational settling and separation of unwanted solid, liquid impurities and dissolved salts and gases from commercial oil or gas condensate in a separator. In this case, a comprehensive purification of the oil or gas condensate produced in the reservoir mixture is carried out in one underground apparatus. To do this, the extracted reservoir mixture is pumped through the central working string of pipes of a construction and technological well into a cavity previously constructed in a pressure aquifer sand reservoir, filled with water under natural excess pressure and limited from above and from the sides by a water-gas-tight shell. The formation mixture is pumped under the surface of a layer of sand several meters thick left at the bottom of the cavity, preferably using radial horizontal jets. Gas bubbles and oil droplets separated in the filter sand as a result of gravitational settling at the temperature of the rocks containing the cavity are separated in the cavity into a gas layer at the top and an underlying oil layer. The gas is discharged through the annular interpipe between the casing and the intermediate working string to the surface through a pressure regulator into the outlet gas pipeline. Oil is discharged through the annular interpipe between the intermediate and central working columns of the construction and technological well to the surface and then through the pressure regulator into the oil outlet pipeline. Formation water, solid and viscous impurities accumulate at the bottom of the cavity, preferably during the entire period of production of the formation mixture, displacing their excess as necessary into the host aquifer.

EFFECT: elimination of such disadvantages as the need for preliminary degassing of the treated formation mixture in a surface separator, the impossibility of gravitational settling of the separated liquid, the difficulty of uniformly distributing the flow through individual separator pipes, the remaining influence of weather conditions on the appearance of natural convection, the increasing number of shut-off and control equipment, a substantial increase in the cost of construction, injection and operation of each production well with a significant increase in its diameter and diameters and the number of working pipe strings, a decrease in reliability and the risks of failures of complex equipment and accidents requiring the removal of equipment to the surface with the cessation of production, the bulkiness and complexity of installations.

2 cl, 1 dwg