Oil field extraction liquid electromagnetic agglomerating pretreatment device

Abstract

The invention relates to a pretreatment device for electromagnetic coalescence of oilfield produced water, mainly comprising magnetic-field coalescer structure and electrostatic coalescer structure, characterized in that magnetic-field coalescer structure and electrostatic coalescer structure are designed into online pipe structure; they are designed on the module and are connected in the dehydration process of oil produced water in series; the inlet of magnetic-field coalescer is connected with heating furnace or buffer tank at the upstream of liquid and the outlet is connected with the inlet of electrostatic coalescer structure; the outlet of electrostatic coalescer is connected with the inlet of three-phase separator, or settling tank, or external transportation tank at the downstream of liquid. The invention improves the coalescence effect of produced water and solves the dehydration difficulty for produced water with much water.

Description

1. Technical field [0001] The invention relates to an oilfield production fluid pretreatment device, in particular to an oilfield production fluid electromagnetic coalescence pretreatment device. 2. Background technology [0002] With the prolongation of oil well production time, the water cut gradually increases. When the water cut rises to a certain level, the water-in-oil emulsion formed at the initial stage will reverse to the oil-in-water emulsion. The main oil area of ​​Shengli Oilfield has entered a period of high or extremely high water cut, and the current overall comprehensive water cut has reached 89.7%. The comprehensive water cut of oilfields in the main section, such as Gudong, Gudao, Dongxin, and Shengli, is already above 90%. As the water content of the produced fluid continues to rise, especially in the late stage of oilfield development, the continuous development of production technology, such as the application of technologies such as tertiary oil recove...

AI Technical Summary

Problems solved by technology

As the water content of the produced fluid continues to rise, especially in the late stage of oilfield development, the continuous development of production technology, such as the application of technologies such as tertiary oil recovery water injection, polymer injection, ASP flooding, planing adjustment, and plugging removal, has added a large number of The emulsification degree of the crude oil produced in the oil field becomes more and more serious, which makes the oil-water sedimentation and separation difficult, and the water content of the crude oil exported continues to rise, making it difficult to carry out the subsequent separation process.

When the water-containing crude oil is sheared by the dehydration pump, the water droplets become finer, the crude oil emulsion becomes more stable, and the conductivity of the emulsion increases. When a high-voltage electric field is applied, the current will increase, or even short-circuit, making dehydration more and more difficult. The larger the size, the conventional electrochemical second-stage dehydration has been difficult to meet the requirements of crude oil export indicators. Therefore, it is necessary to add a new treatment device to the pre-dehydration of the produced fluid, that is, the first-stage dehydration to meet the needs of production.

[0003] At present, the methods and equipment used in the first-stage dehydration of produced fluid are no longer suitable for the needs of actual production conditions, such as domestic large tank sedimentation dehydration, cyclone pre-dehydration, three-phase separator dehydration, permanent magnet coalescence dehydration, and foreign electrostatic dehydration. Coalescing dehydration is powerless to complex emulsions produced in oilfields. Only by developing a new production fluid pretreatment device in combination with reality can the second-stage dehydration reach the water content index for external transportation.

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