Integrated skid-mounted complete device and treatment process thereof for treating sulfur-containing produced water of ultra-low permeability oil field

Abstract

The invention discloses a treatment process and an integrated skid-mounted complete device for treating sulfur-containing produced water of an ultra-low permeability oil field. The problems that a conventional process is not beneficial to integration, low in self-control degree and poor in treatment effect are solved. The complete device comprises four single sledges, namely an aeration sulfur removal sledge, an air floatation oil removal sledge, a double-layer particle filter material filter sledge and an organic membrane fine filtration single sledge. The overall treatment process sequentially comprises the following four steps: 1, water from an oil station firstly enters the aeration sulfur removal sledge to remove most of floating oil and sulfide; 2, the effluent in step 1 is lifted tothe air floatation oil removal sledge to remove emulsified oil and part of light suspended solids; 3, the effluent in step 2 is lifted to the double-layer particle filter material filter sledge to further remove emulsified oil and suspended solids; and 4, the effluent in step 3 is lifted to the organic membrane fine filter sledge to further filter out residual trace suspended matters in the water. The treatment process and device can realize stable operation of the process flow, good treatment effect, compact and integrated arrangement and high automation of operation.

Description

technical field [0001] The invention relates to the technical field of oilfield produced water treatment, in particular to an integrated skid-mounted complete device for treating sulfur-containing produced water in an ultra-low permeability oilfield and a treatment process thereof. Background technique [0002] In order to ensure the stable production of the oilfield, the oilfield has gradually developed peripheral and scattered blocks in recent years. With the extension of the development time, the comprehensive water content of the produced fluid has gradually increased, and the amount of oily sewage has increased year by year. The water quality impact of transportation has affected the stable operation of the built treatment system. In addition, most of the peripheral scattered blocks are ultra-low permeability reservoirs, and the sulfur content in produced sewage is gradually increasing, which will not only intensify the corrosion of pipelines and equipment, but also bri...

AI Technical Summary

Problems solved by technology

At present, the commonly used ultra-low permeability oilfield produced water treatment method for oilfield sewage is to adopt the treatment process of primary natural settlement tank + secondary coagulation settling tank + primary filter tank + secondary filter tank + membrane filtration. Due to the limitations of residence time, gravity flow, and accident flow, the processing equipment used is not conducive to the integration of compact and integrated complete skid-mounted devices, and the existing processing technology is difficult to operate manually, requiring manual care, and the overall relocation of the device cannot be realized. reuse

Therefore, the rolling development of oilfields in scattered peripheral blocks, small single well fluid production, scattered and long distances, and poor ground system support have resulted in fewer oil wells put into production at the initial stage of development, and the water produced is small, making it impossible to build large and medium-sized oil wells in a concentrated manner. At the same time, the ground engineering construction needs to greatly shorten the construction period and other issues. An integrated and integrated produced water treatment device is developed to solve the problem that the small amount of produced water in scattered blocks cannot be treated locally. At the same time, the overall relocation of the device can also be realized. and reuse

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