Intelligent self-circulation well washing device

Abstract

The invention provides an intelligent self-circulation well washing device, wherein a drainage fluid treatment system in a washing fluid treatment part is controlled by an intelligent control treatment part to desand the washing fluid, and then subjected to impurity separation by a settling tank, the drainage fluid which has been subjected to impurity separation is rough filtered by a coarse strainer and fine filtered by a fine filter to clean the washing fluid, a working fluid power system in the washing fluid treatment part is controlled by the intelligent control treatment part to adjust the rotating speed of an engine so as to use the cleaned washing fluid as the working fluid to be converted into high-pressure working fluid by a well washing pump to output, and thus the cleaning of the well is achieved. The intelligent self-circulation well washing device is a vehicle-mounted well washing vehicle, and has a function of intelligently controlling the whole washing process; according to the intelligent self-circulation well washing device, effectively control in the well washing process according to different kinds of wells and different washing phases can be achieved, the water injection well is protected, and the washing quality of the water injection well is improved.

Description

technical field [0001] The invention relates to well-flushing operation equipment for oil field water injection wells, in particular to an intelligent self-circulating water well flushing equipment. Background technique [0002] Well flushing of water injection wells can generally be divided into three types: normal wells, wells producing sand, and under-injection wells. Different types of wells have different cleaning requirements. Normal flushing of water injection wells is performed in three stages. 1. The stage of micro-spray without leakage: control the blowout gate at the wellhead to make the oil pressure at the wellhead lower than the pneumatic pressure 1MPa, and adjust the flushing displacement to 25m 3 / h, well flushing 2h, injection volume controlled at 3m 3 / h. 2. Balance well flushing stage: control the blowout gate at the wellhead to make the oil pressure equal to the starting pressure, and adjust the flushing displacement to 35 m 3 / h, wash the well for 2h...

AI Technical Summary

Problems solved by technology

[0004] 1. Manually control the opening and closing of the water well flushing inlet and outlet gates before the well flushing, causing pressure ripple and great impact on the formation

In particular, polymer injection-to-water flooding and sand production wells are very sensitive to pressure changes. Sudden changes in pressure often cause sand production and accumulation in the formation, resulting in failure of well washing

[0005] 2. Manual control of the pressure and displacement of the well flushing process cannot meet the requirements of different flushing process designs for different water injection wells

At present, the control process is entirely controlled manually. The specific control process: one person operates the plunger pump of the well-washing vehicle, controls the output pressure and displacement of the plunger pump for well-washing, and changes the gear and position of the plunger pump for well-washing by the operator. Control the size of the engine throttle to achieve fuzzy implementation, and it is impossible to achieve precise control

In particular, the pressure in the well changes rapidly, and it is impossible to respond manually in a very short time.

[0006] 3. Starting the well flushing plunger pump with load affects the life of the equipment

[0007] 4. When the pressure in the well is higher than the pressure of the injected liquid due to the failure of the discharge manifold of the well flushing plunger pump, it is easy to cause the liquid in the well to return from the liquid injection end, which may easily cause pressure fluctuations in the well, damage the formation, and cause well flushing failure

[0008] 5. Unable to deal with pollutants such as polymers in the flushing fluid of polymer injection-to-water flooding wells

Images