Offshore oilfield production water oil removal system process method based on magnetic particles

Abstract

The invention provides an offshore oilfield production water oil removal system process method based on magnetic particles. The offshore oilfield production water oil removal system process method comprises the following steps that oil-containing production water from a production separator and the magnetic particles are mixed and enter a production water oil removal device based on the magnetic particles; magnetic particle-containing sump oil treated by the magnetic particle-based production water oil removal device enters a magnetic particle removal device, and qualified production water is discharged or treated and reinjected; the magnetic particles treated by the magnetic particle removal device are recycled, and the crude oil is removed from the oil bin. By adopting the technical scheme, technical support is provided for shortening the production flow, reducing the occupied area and improving the treatment effect for offshore production water treatment; according to the technical scheme, the magnetic particles have the characteristic that one side is oleophylic and the other side is hydrophilic, and the produced water oil removal device and the magnetic particle removal device based on the magnetic particles are designed, so that high-efficiency, compact and stable oil removal and separation of produced water are realized, and the practical value and the popularization and application value are relatively high.

Description

Technical Field

[0001] This invention relates to the field of offshore oilfield production water technology, and in particular to a process method for an offshore oilfield production water removal system based on magnetic particles. Background Technology

[0002] The process of offshore oilfield production water treatment system is still mostly inclined plate oil separator + dissolved air flotation + walnut shell filter and hydrocyclone + conventional cyclone flotation. The process treatment effect is relatively stable, but there are problems such as large footprint, unstable treatment effect after the water volume increases, and poor resistance to shock load.

[0003] Conventional production water treatment processes are lengthy, require large land areas, have low treatment efficiency, and incur high investment and operating costs. With increased oilfield reserves and production, the volume of production water will increase significantly, making oil-water separation more challenging. Furthermore, increasingly stringent requirements for production efficiency and environmental protection are leading to stricter regulations on oilfield production water discharge / reinjection. Therefore, developing a miniaturized and efficient production water treatment process is essential for shortening the production process, reducing land area, and improving treatment effectiveness. Summary of the Invention

[0004] The main technical problem to be solved by the present invention is that the existing technology has low processing efficiency, large equipment footprint, and poor resistance to shock loads. In order to overcome the above-mentioned defects of the existing technology, a process method for oil removal system of offshore oilfield production water based on magnetic particles is provided.

[0005] The technical solution adopted by this invention to solve its technical problem is: A process method for removing oil from production water in offshore oilfields based on magnetic particles, comprising the following steps: S1: Oily production water from the production separator is mixed with magnetic particles and enters the production water oil removal device based on magnetic particles; S2: Oily waste containing magnetic particles after treatment by the production water oil removal device based on magnetic particles enters the magnetic particle removal device, and qualified production water is discharged or treated and reinjected. S3: Magnetic particles processed by the magnetic particle removal device are recycled and reused, and crude oil is removed from the oil tank.

[0006] Furthermore, in step S2, the oil-water separation is achieved by using the internal structural separation element in the production water oil removal device based on magnetic particles to cause the production water and oil-containing particles in the water to aggregate and the oil droplets to float and separate.

[0007] An apparatus for a process method of oil removal system for offshore oilfield production water based on magnetic particles includes a production water oil removal device based on magnetic particles, a magnetic particle removal device, and a magnetic particle suspension. The production water oil removal device based on magnetic particles is a production water oil removal device in which oil droplets aggregate and float to the surface through magnetic particles, thereby achieving oil-water separation. The magnetic particle removal device is an oil phase and magnetic particle separation device in which magnetic particles desorb from the oil phase through magnetism, thereby achieving separation of the oil phase and magnetic particles.

[0008] Furthermore, the oil removal device for production water based on magnetic particles has an internal structural separation element. The internal structural separation element causes the production water and oil-containing particles in the water to agglomerate and the oil droplets to float and separate, thereby achieving oil-water separation.

[0009] The beneficial effects of this invention are: This invention provides a process method for marine production water treatment systems by adopting the above-mentioned technical solution. It provides technical support for shortening the production process, reducing the footprint, and improving the treatment effect in marine production water treatment. This technical solution breaks the traditional process of current marine production water treatment systems. By utilizing the oleophilic and hydrophilic properties of magnetic particles and designing a magnetic particle-based oil removal device and magnetic particle removal device for production water, a new, efficient, and compact design scheme is developed. This solves the problems of low treatment efficiency, large equipment footprint, and poor resistance to shock loads in existing technologies, achieving efficient, compact, and stable oil separation of production water. It has high practical value and application value. Attached Figure Description

[0010] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0011] Figure 1 This is a process flow diagram of the present invention.

[0012] Explanation of the labels in the diagram: 1. Oily production water from the production separator; 2. Oil removal device for production water based on magnetic particles; 3. Magnetic particle removal device; 4. Magnetic particle suspension. Detailed Implementation

[0013] The present invention will be further described below with reference to specific embodiments. The illustrative embodiments and descriptions herein are used to explain the present invention, but are not intended to limit the present invention.

[0014] Example: Figure 1 This paper presents a process method for a production water removal system for offshore oilfields based on magnetic particles.

[0015] like Figure 1As shown, this invention discloses a process method for removing oil from production water in offshore oilfields based on magnetic particles, comprising the following steps: S1: Oily production water from the production separator is mixed with magnetic particles and enters the production water oil removal device 2 based on magnetic particles, laying the foundation for subsequent oil-water separation by utilizing the characteristics of magnetic particles.

[0016] S2: The oily waste containing magnetic particles after being treated by the magnetic particle-based production water oil removal device 2 enters the magnetic particle removal device 3, and the qualified production water is discharged or treated and reinjected; this realizes the diversion treatment after oil-water separation, which not only provides a path for magnetic particle recovery and crude oil recovery, but also ensures the compliant disposal of qualified production water, so that the process can be efficiently circulated and environmental protection can meet the standards.

[0017] S3: The magnetic particles processed by the magnetic particle removal device 3 are recycled and reused, and the crude oil is returned to the oil tank. This step realizes the recycling of magnetic particles and the recovery of crude oil resources, which reduces material costs, improves resource utilization, and ensures the economy and sustainability of the process.

[0018] This invention also discloses an apparatus for a process method of oil removal from production water in offshore oilfields using magnetic particles, comprising a magnetic particle-based production water oil removal device 2, a magnetic particle removal device 3, and a magnetic particle suspension 4. The magnetic particle-based production water oil removal device 2 is a production water oil removal device where oil droplets aggregate and float to the surface via magnetic particles, achieving oil-water separation. The magnetic particle removal device 3 is an oil phase and magnetic particle separation device where magnetic particles desorb from the oil phase through magnetism, achieving separation of the oil phase and magnetic particles.

[0019] Specifically, the oily production water 1 from the production separator is mixed with the magnetic particle suspension 4 and then enters the production water oil removal device 2 based on magnetic particles. Based on the characteristic that magnetic particles are oleophilic on one side and hydrophilic on the other side, the production water and oily particles in the water are separated by the internal structural separation elements in the production water oil removal device 2, and the oil droplets are separated by floating, thus achieving oil-water separation. The treated magnetic particle-containing sludge and oil enter the magnetic particle removal device 3, and the qualified production water is discharged or treated and reinjected.

[0020] The magnetic particle suspension 4, after being treated by the magnetic particle removal device 3, is mixed with the oily production water 1 from the production separator and enters the production water oil removal device 2 based on magnetic particles, thus removing the crude oil from the oil tank.

[0021] This invention, by adopting the above-mentioned technical solution, provides a process method for marine production water treatment systems, offering technical support for shortening the production process, reducing the footprint, and improving the treatment effect in marine production water treatment. This technical solution breaks the traditional process of current marine production water treatment systems. By utilizing the oleophilic and hydrophilic properties of magnetic particles and designing a magnetic particle-based oil removal device and magnetic particle removal device for production water, a novel, efficient, and compact design scheme is developed. This solves the problems of low treatment efficiency, large equipment footprint, and poor resistance to shock loads in existing technologies, achieving efficient, compact, and stable oil separation of production water, and has high practical value and application value.

[0022] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A process method for removing oil from production water in offshore oilfields based on magnetic particles, characterized in that, Includes the following steps: S1: Oily production water from the production separator is mixed with magnetic particles and enters the production water oil removal device based on magnetic particles (2). S2: The oily waste containing magnetic particles after being treated by the magnetic particle-based production water oil removal device (2) enters the magnetic particle removal device (3), and the qualified production water is discharged or treated and reinjected. S3: Magnetic particle removal device (3) The magnetic particles after treatment are recycled and reused, and the crude oil is removed from the oil tank.

2. The process method for a marine oilfield production water removal system based on magnetic particles according to claim 1, characterized in that, In step S2, the oil-water separation is achieved by using the internal structural separation element of the production water oil removal device (2) based on magnetic particles to cause the production water and oil-containing particles in the water to aggregate and the oil droplets to float and separate.

3. The apparatus for a process method of offshore oilfield production water oil removal system based on magnetic particles according to claim 1, characterized in that, The device includes a production water oil removal device (2) based on magnetic particles, a magnetic particle removal device (3), and a magnetic particle suspension (4). The production water oil removal device (2) based on magnetic particles is a production water oil removal device in which oil droplets aggregate and float in the production water oil removal device (2) based on magnetic particles to achieve oil-water separation. The magnetic particle removal device (3) is an oil phase and magnetic particle separation device in which magnetic particles desorb from the oil phase through magnetism to achieve separation of the oil phase and magnetic particles.

4. The apparatus for a process method of offshore oilfield production water oil removal system based on magnetic particles according to claim 3, characterized in that, The production water oil removal device (2) based on magnetic particles has an internal structural separation element. The production water and oil-containing particles in the water are aggregated and separated by the internal structural separation element, thereby achieving oil-water separation.

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