Oil production well hot washing liquid filtering device

Abstract

The invention discloses an oil production well hot washing liquid filtering device, and specially relates to the field of well washing tools. The device comprises a conical outer cylinder body, wherein an inlet end inverted pulling head and an outlet end inverted pulling head are installed at the two ends of the outer cylinder body, a large pore size filtering cylinder and an inlet fixing seat arearranged in the inlet end inverted pulling head, an impurity liquid separation cylinder is installed in the inlet fixing seat and an outlet fixing seat, a communicating hole is formed in one side ofthe outer cylinder body, and an impurity discharging flange, a valve body and an impurity settling box are installed on one side of the outer cylinder body. According to the invention, by arranging the conical impurity liquid separation cylinder and the conical spiral blade, after a washing fluid enters the washing fluid filtering device, the inclined centrifugal force is formed in the tangentialdirection of the periphery of the cylinder body through the conical impurity liquid separation cylinder and the conical spiral blade, and is gradually increased along the outlet direction, so that thegravels with various particle sizes in the washing fluid are thrown out of the impurity liquid separation cylinder due to the great centrifugal force so as to be separated from the washing fluid, andthe washing fluid mixed with the small-particle stratum sand can be well filtered.

Description

technical field [0001] The present invention relates to the technical field of well flushing tools, and more specifically, the present invention relates to a filter device for oil production well hot flushing liquid. Background technique [0002] Under the condition of high temperature and high pressure in the oil layer, the wax dissolves in the crude oil. After the crude oil flows into the wellbore, its pressure and temperature gradually decrease during the flow process from the bottom of the well to the wellhead. When the temperature and pressure drop to the wax precipitation point, the wax Precipitation from crude oil will cause wax deposition in the wellbore. When the wax deposition reaches a certain level, well cleaning and maintenance are required. Although the proportion of steam cleaning and self-circulation cleaning has been increased, conventional well cleaning is still the top priority. It is an essential work to ensure the normal production of oil wells. [0003...

AI Technical Summary

Problems solved by technology

[0005] But above-mentioned technical scheme still has many shortcomings when practical application;

[0006] 1. Due to the simple structure of the device, the formation sand, scale, cement block and other sundries in the flushing fluid are only intercepted by the filter cartridge, and the retained formation sand, scale, cement block and other sundries are accumulated in the filter cartridge for a long time After the accumulation of time, the flow of the well flushing fluid is not smooth and must be cleaned in time. It is necessary to remove the washing fluid filter device and take out the filter cartridge to clean up. The cleaning is troublesome and delays the well cleaning period;

[0007] 2. Due to the small particle diameter of the formation sand, the particles of the formation sand easily pass through the aperture of the filter cartridge. In actual use, some formation sand particles smaller than the aperture of the filter cartridge cannot achieve the filtering effect, resulting in repeated washing of some oil wells. After the well, a large amount of formation sand enters the wellbore with the well flushing fluid and accumulates, resulting in valve failure or pump stuck in the well, affecting the production of the oil well, or even stopping production, and increasing the workload of implementing pump bumps and adjusting stroke times.

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