Oilfield produced water filter and purifying method thereof

Abstract

The invention discloses an oilfield produced water filter and a purifying method thereof, and belongs to the field of oilfield produced water treatment. The filter comprises: a support plate positioned in a filter shell and provided with a through hole in the center, and a first screen barrel and a second screen barrel which are positioned on the support plate, wherein a first annular space existsbetween the first screen barrel and the second screen barrel, and a second annular space exists between the second screen barrel and the filter shell; a filter material filled in the first annular space; and an electric heater arranged between the support plate and the bottom of the filter shell, wherein the tops of the first screen barrel and the second screen barrel are sealed, and the sidewalls of the first screen barrel and the second screen barrel are provided with slits for a fluid to go through. The method comprises the following steps: turning on the power supply of the electric heater, heating sewage in the filter, and backwashing the filter with water. Polluted oil, impurities and the like are smoothly discharged from the filter when the filter is backwashed in order to preventthe screen barrels of the filter from rupturing and deforming.

Description

technical field [0001] The invention relates to the field of oilfield produced water treatment, in particular to an oilfield produced water filter and a purification method thereof. Background technique [0002] After the oilfield produced water is treated, it will usually be re-injected into the formation through the water injection well. The oilfield produced water filter is the key equipment for oilfield produced water treatment. Whether the filter can operate normally is related to whether the water quality of the reinjection water can meet the standard . [0003] At present, oilfield produced water filters mainly include a circular upper blocker with the same diameter as the filter, a lower blocker and filter material filled between the blockers, wherein the upper blocker and the lower blocker can be sieve plates, Screens etc. When treating oilfield produced water, when the sewage passes through the filter, the dirty oil and impurities are intercepted by the filter ma...

AI Technical Summary

Problems solved by technology

[0005] When treating the oilfield produced water by using the oilfield produced water filter in the high pouring thick oil field, because the high pouring heavy oil contains wax, colloid, and the freezing point is high, the dirty oil filtered out during backwashing and mixed When the impurities with dirty oil pass through the blocker, the resistance is relatively large. Under the action of hydraulic pressure, the upper blocker is easily deformed and damaged, resulting in the loss of filter material and filter failure.

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