Method for increasing filtering speed of filter material

Abstract

The invention discloses a method for increasing the filtering speed of a filter material, wherein the method comprises the following steps: 1) firstly, adding strong oxidant gas into sewage to oxidize and decompose or/and crush a water-soluble polymer or/and polymer residue in the sewage so as to enhance the ability of the sewage to pass through the filter material; and 2) filtering the sewage by using the filter material so as to enable the sewage to reach the standard for reinjection. The method can effectively solve the problem that a water-soluble polymer and emulsified oil severely influence the filtering speed and filtering performance of the filtering material, can greatly reduce the dosage and operation cost of demulsification and dehydration and sewage treatment of the combination station, and can greatly reduce the sludge yield; and the method has the advantages of being easy to implement, safe, reliable, wide in application, easy to popularize and the like.

Description

technical field [0001] The invention relates to the fields of oil and gas production and / or water treatment, in particular to a method for increasing the filtration speed of a filter material. Background technique [0002] At present, a large amount of sewage generated in the process of crude oil exploration and production is usually treated by sedimentation (or air flotation), filtration and other methods, and then re-injected into the oil layer or formation; figure 1 As shown, the sewage treatment method can be summarized as follows: the water-containing crude oil (also known as production fluid) produced by oil well 100 enters the separation and dehydration device (also known as three-phase separator) through valve 101 and oil collection pipeline (also known as oil production pipeline) 102 ) 103; in the separation and dehydration device 103, the separated associated gas (also known as natural gas) enters the natural gas pipeline 104 for further processing, the separated c...

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Problems solved by technology

[0010] However, at present, after the water-soluble polymer flooding method is applied to the oil wells under the jurisdiction of the joint station, the polymer content of the sewage after removal is about 20mg/L, and the suspended solid content is as high as 360mg/L or more; although the four filter tanks used in the station The material is still the mixed filter material of quartz sand + walnut shell, and the backwashing intensity (i.e. backwashing water flow rate) is increased by 1.5 times, and the backwashing frequency (or frequency) is increased by 1 times (i.e., after filtering the sewage for 4 hours, it can be used after filtration. However, the suspended solids content of the sewage filtered by the filter tank is still as high as 70mg/L, and the suspended solids content of the reinjected sewage is still as high as 60mg/L, which has exceeded the water injection in clastic rock reservoirs. The water quality index and analysis method SY/T5329-2012" and Shenyang Oilfield stipulated that the water injection index is more than 30 times, which has led to a substantial increase in the pressure of the water injection system; moreover, the pressure difference between the inlet and outlet of the filter tank is higher than that of the oil well using the water-soluble polymer flooding method The amount of filtered water (i.e. the filtration rate) is more than 60% lower than that before the water-soluble polymer flooding method was applied to the oil well, and the amount of backwash water increased by more than 150% compared to the oil well before the water-soluble polymer flooding method; As a result, the joint station is currently unable to use the existing 4 filter tanks to meet the task of sewage filtration

[0011] 2. The method of soaking and washing the filter material with detergent or/and acid and alkali is ineffective, and cannot effectively solve the problem of slow filtration rate of the filter material and substandard water after filtration

[0013] In order to solve the problems of slow filtration speed, increased pressure difference, poor backwashing effect, and greatly reduced filtered water volume of the e

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