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Purification method for oilfield reinjection water

A technology for oil field re-injection and refining method, which is applied in the field of oil-field re-injection water refining and oily sewage treatment. question

Active Publication Date: 2014-03-26
ZHEJIANG CATHAYRIPE ENVIRONMENTAL ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problems are: the filtration accuracy is not high, the median particle size of suspended solids in the produced water is not up to the standard; the requirements for incoming water quality are high, such as the suspended solids and oil content are required to be less than or equal to 10mg / L; the water quality impact resistance is poor, Incoming water quality has a great impact
The oilfield reinjection water treated by the method of the invention can reach the B-level standard. The main problem is that the treatment accuracy is not high, the particle size of suspended solids in the water cannot be controlled, and it cannot meet the water injection quality requirements of low-permeability or ultra-low-permeability blocks.

Method used

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  • Purification method for oilfield reinjection water
  • Purification method for oilfield reinjection water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0136] 1. Pretreatment of oilfield produced water

[0137] The oilfield produced water is subjected to gravity sedimentation treatment, coagulation sedimentation treatment and walnut shell filtration treatment in sequence, that is, the traditional "three sets of" treatment process is used to pretreat the oilfield produced water to remove oil and impurities to obtain pretreated water flow , the water quality of the pretreated water flow, that is, the influent water quality of the first-stage membrane filtration treatment, is shown in Table 1.

[0138] 2. Membrane filtration treatment

[0139] In the present embodiment, the main body 11 of the carrier-type carbon membrane membrane core is provided with 1480 filter channels 12 and water production channels 13 with a square cross section. The side lengths of the filter channels 12 and water production channels 13 are 2 mm, as Figure 5 , 6 , 7 shown. The main body 1 of the membrane core of the embodiment of the present inventio...

Embodiment 2

[0147] 1. Pretreatment of oilfield produced water

[0148] The oilfield produced water is subjected to gravity sedimentation treatment, coagulation sedimentation treatment and walnut shell filtration treatment in sequence, that is, the traditional "three sets of" treatment process is used to pretreat the oilfield produced water to remove oil and impurities to obtain pretreated water flow , the water quality of the pretreated water flow, that is, the influent water quality of the first-stage membrane filtration treatment, is shown in Table 2.

[0149] 2. Membrane filtration treatment

[0150] The pretreatment water flows into the first-stage membrane module through the water inlet pipe 5, and the first-stage membrane filtration treatment is performed in a cross-flow manner, wherein, in addition to controlling the inlet water pressure of the first-stage membrane filtration treatment to 0.4MPa, adjusting the concentration from the concentrated water outlet pipe 6 Outflow concent...

Embodiment 3

[0156] In addition to the pretreatment water quality, which is the influent water quality of the first-stage membrane filtration treatment; the first-stage filtration inlet water pressure is 0.43MPa, the concentrated water pressure is 0.35MPa, the product water pressure is 0.2MPa, and the transmembrane pressure difference is 0.19MPa; The inlet water pressure of the secondary filtration is 0.2MPa, the concentrated water pressure is 0.18MPa, the product water pressure is 0.12MPa, and the transmembrane pressure difference is 0.07MPa, and the rest are the same as in Example 2. Table 3 shows the water quality of the pretreated water and the water quality after the secondary membrane filtration treatment.

[0157] Table 3 embodiment 3 water quality analysis results

[0158] project

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Abstract

The invention discloses a purification method for oilfield reinjection water. According to the method, at least one level of membrane filtration treatment is carried out on oilfield produced water through a cellular carrier type inorganic carbon membrane component so as to prepare the reinjection water suitable for low permeability and extra-low permeability oil reservoirs, wherein the filter precision of the membrane component for membrane filtration treatment is 0.001-100mu m. The purification method has high filtration accuracy, the membrane flux of the compound carbon membrane carrier is large, the capacity of the membrane in resisting oil contamination is strong, the integration level of the structure of the membrane core is high, the quality of the prepared reinjection water is stable, and fine filtrated oilfield reinjection water meets the requirement of the reinjection water for the oil reservoirs in low permeability and extra-low permeability block, and meets the A-grade standard of 'recommended index and analysis method for quality of oil reservoir injection water of clastic rock' (SY / T 5329-94).

Description

technical field [0001] The invention relates to a method for treating oily sewage, in particular to a method for refining oilfield reinjection water, and belongs to the technical field of environmental engineering. Background technique [0002] As most oilfields in China enter secondary and tertiary production, the proportion of development in low-permeability and ultra-low-permeability blocks is increasing year by year, and the water content of the produced fluid is as high as 90%. big effect. Reservoir water injection requirements in low-permeability and ultra-low-permeability blocks are relatively high. At present, the domestic reinjection water quality is implemented in the industry standard "Recommended Indicators and Analysis Methods for Water Injection Water Quality in Clastic Reservoirs" (SY / T 5329-94), which requires The highest grade A1 standard is that the oil content is ≤5mg / L, the suspended solids content is ≤1mg / L, and the median particle size of suspended sol...

Claims

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Application Information

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IPC IPC(8): C02F1/44C02F103/10
Inventor 李光辉
Owner ZHEJIANG CATHAYRIPE ENVIRONMENTAL ENG
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