Oil field produced water membrane filtering device in internal circulation surface cross flow form

Abstract

The invention relates to an oil field produced water membrane filtering device in an internal circulation surface cross flow form. The device comprises a body, an upper sealing plate, a lower sealingplate and a water inlet, and further comprises a flow guide cylinder, tubular membrane units, a water outlet, a flow guide water outlet and a flow guide water inlet, wherein the upper end of the flowguide cylinder is fixed with the top of the main body, the lower end of the flow guide cylinder penetrates through the upper sealing plate and the lower sealing plate, the flow guide water outlet in the lower end of the flow guide cylinder is formed in a tubular membrane water inlet area, the flow guide water inlet is formed in the outer wall of the upper portion of the flow guide cylinder locatedin a tubular membrane water outlet area, the tubular membrane unit comprises a tubular filtering membrane, and the multiple tubular membrane units are respectively arranged in tubular membrane filtering areas located between the upper sealing plate and the lower sealing plate. According to the technical scheme, the problems of easily being polluted and frequent cleaning of the filtering membraneare effectively solved; the device has characteristics of high integration degree, small occupation area and low operation energy consumption, and can scour the membrane surface in an internal cross-flow filtration manner so as to achieve the cleaning and regeneration of the filtering membrane while filtration.

Description

technical field [0001] The invention relates to an oilfield produced water film fine filtration device, in particular to an oilfield produced water film filtration device in the form of internal circulation surface cross-flow. Background technique [0002] Most of the large amount of oily wastewater produced in the oil exploration and production of onshore oilfields must be treated to a certain standard before it can be reinjected. -2012) stipulates the requirements of different permeable layers for the water quality conditions of water injection, among which there are clear index requirements for oil content and suspended solids content. In order to meet the water quality requirements of low-permeability reservoirs, membrane filtration technology is usually used. Since oilfield produced water contains relatively high concentrations of petroleum substances, the membrane filtration process needs to be matched with corresponding cleaning and regeneration such as backwashing, c...

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Problems solved by technology

[0005] In view of this, the main purpose of the present invention is to provide an oilfield production water membrane filtration device in the form of cross-flow on the inner circulation surface. Through this technical solution, it effectively solves the problems of easy pollution of the membrane and relatively low oil removal efficiency in the existing membrane filtration. The big problem is that a tubular membrane separation unit is installed inside the equipment. A water circulation pump and a simple diversion structure are installed inside the equipment to form an internal water circulation in the equipment tank. In the working state, the surface of the membrane unit forms a flushing water flow with a certain flow rate. , so that the flushing water flow direction is perpendicular to the water flow direction of the membrane unit, which effectively prevents oil and other suspended pollutants in the water from accumulating on the surface of the membrane unit to cause fouling, improves the membrane separation efficiency, realizes membrane self-cleaning, and reduces energy consumption during operation. Low, so that the oil in the oily wastewater is effectively separated

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