METHOD OF REMOVING ASPO FROM WELL EQUIPMENT Russian patent published in 2018 - IPC E21B37/06 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil industry and can be used while the operation of wells, in the elevator pipes where various deposits are formed. In carrying out the process, pump the solvent into the tubing string of the wellbore and wait for a certain time to dissolve the deposits. Preliminary, provide the lower part of the tubing string above the deep electrocentrifugal pump (ECP) with a check valve, a bypass valve to the annular space and a pressure sensor. Install the second pressure sensor inside the tubing string at the wellhead as well. Output the pressure data from both sensors via the power supply line of the ECP to the well control station. Pump the solvent from the wellhead into the tubing column at a time-decreasing space velocity and simultaneously monitor by pressure sensors for changing the pressure at the bottom and top points of the tubing string. Evaluate the filling of the column of elevator pipes with a solvent is judged by the moment of stabilization of the hydrostatic component of the pressure of the liquid column in the zone of the lower sensor. Degree of removal of the sediments by dissolving them is evaluated by increasing the density of the solvent and the hydrostatic pressure component in the zone of the lower sensor to a maximum value with the support of the solvent level at the well head or above. Evaluate the first and second stabilization of hydrostatic pressure of the solvent column in the tubing string in the absence of solvent movement and well production along the tubing string, namely, in the static position of the fluids. Perform the cyclic solvent injection into the tubing string until the deposits from the pipe string are completely removed.

EFFECT: efficiency of sediment removal is increased by providing the ability to control the process and the rational use of reagents.

1 cl, 2 dwg