Oil production block produced water reinjection method

Abstract

The invention provides an oil production block produced water reinjection method. The method comprises the steps that (1) produced water is subjected to water quality analysis, and the ion content ismeasured; (2) the produced water is subjected to a flocculation test, a flocculation treatment agent refueling scheme is determined according to test results, and the flocculation test is directed atsimulated water of multi-layer mixed cutting; (3) a reservoir is protected, specifically, the compatibility of injected water and the reservoir after treatment is determined; (4) scale inhibition is conducted, specifically, descaling treatment is conducted specific to the property of liable scaling of a multi-layer mixed sewage part; and (5) reinjection is conducted, specifically, whether treatedsewage meets the requirements of a reinjection formation is checked, and the produced water meeting the requirements of the reinjection formation is reinjected. The method forms an efficient and stable process technology integrating corrosion resistance, scale inhibition, sterilization, flocculation and reservoir protection, and thus the treated sewage can meet the requirements of the reinjectionformation.

Description

technical field [0001] The invention relates to the field of produced water treatment, in particular to a method for reinjecting produced water in an oil production block. Background technique [0002] With the increase of oil field exploitation age and the shortage of oil resources, most oil fields have used water flooding development technology to enhance oil recovery. Due to the continuous progress of the water injection development process, the comprehensive water content of the produced fluid will gradually increase, and some blocks even exceed 90%. In addition, most of the oil production blocks in my country's major oil fields and gas fields are located in areas where water resources are relatively scarce, and oil development requires a large amount of water resources. From the perspective of compatibility with reservoir physical properties, it is best to treat oily sewage water injection source. [0003] Oilfield produced water is extracted from the formation togethe...

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Problems solved by technology

[0006] (2) Corrosion: The pipelines, equipment, and devices used in the oil field are basically made of metal materials, and corrosion will shorten their service life. It is necessary to control the corrosiveness of the injected water

[0010] (2) Oil content: the tiny oil particles dispersed and suspended in the injected water, the damage to the reservoir is similar to the damage caused by the suspended solids to the reservoir, it is easy to cause the pores and throats between the clay in the formation to be blocked, and the injection of injected water is reduced sex

[0016] Therefore, it is necessary to design a systematic and reasonable method of reinjection of produced water in oil production blocks to overcome the problem that the quality of reinjection water of produced water is not up to standard

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