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Method for removing sulfate radical from injected water in oil field for anti-scaling

A technology for desulfurization and water injection, which is applied in chemical instruments and methods, earthwork drilling, cleaning tools, etc., can solve problems such as difficult treatment and limited effect of chemical methods, and achieve the effect of ensuring stable production and reducing water injection pressure.

Active Publication Date: 2009-09-09
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chemical anti-scaling is to prevent the formation of scale by adding chemical anti-scaling agent, using the complexation solubilization, dispersion and crystal distortion of anti-scaling agent, but the effect of chemical method is very limited, and the performance of the agent will change with time and pH value. , Formation temperature changes, once the scale is acid-base insoluble, it is difficult to deal with

Method used

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  • Method for removing sulfate radical from injected water in oil field for anti-scaling
  • Method for removing sulfate radical from injected water in oil field for anti-scaling
  • Method for removing sulfate radical from injected water in oil field for anti-scaling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1: Scale prevention method for desulfurization of injected water in oilfields. Nanofiltration membrane desulfurization device is used to pretreat the injected water so that the injected water is divided into clean water and concentrated water, and then the clean water is injected downhole.

[0035] The whole process of pretreatment of nanofiltration membrane desulfurization unit is as follows:

[0036] A. First, the injected water enters the source water tank 1, and then through the high-pressure pump 2, the injected water in the source water tank 1 enters the coarse filtration system 3 for coarse filtration treatment. The model adopted by the coarse filtration system 3 is XLDJZ-4.

[0037] B. Then, the injected water filtered by the coarse filtration system 3 enters the fine filtration system 4 for processing. The model adopted by the fine filtration system 4 is XLJM-3.

[0038] C. After the injection water is filtered in two stages by the coarse filtration s...

Embodiment 2

[0044] Embodiment 2: The difference with Example 1 is: the component parts by weight of the ternary complex cleaning agent are: 63.1 parts of diethylenetriaminepentaacetic acid (DTPA); sodium ethylenediamine tetramethylene phosphonate (EDTMPS ) 36.2 parts; linear alkylbenzene sulfonate sodium (LAS) 0.7 part, what the anionic surfactant (LAS) adopted was sodium tetradecylbenzene sulfonate.

Embodiment 3

[0045] Embodiment 3: The difference with Example 1 is: the component parts by weight of the ternary complex cleaning agent are: 58.5 parts of diethylenetriaminepentaacetic acid (DTPA); sodium ethylenediamine tetramethylene phosphonate (EDTMPS ) 41.1 parts; anionic surfactant (LAS) 0.4 part, what anionic surfactant (LAS) adopted is sodium dodecylbenzenesulfonate.

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Abstract

A method for removing sulfate radical from injected water in oil field for anti-scaling is applied in anti-scaling of oil fields and oil-water wells. The method is characterized by firstly pumping injected water into a coarse filtration system by a high-pressure pump for carrying out the coarse filtration treatment and then into a fine filtration system for treatment; and further pumping the injected water after the two-stage filtration by the coarse filtration system and the fine filtration system into a nanofiltration system for treatment. The injected water after the treatment is divided into clear water and condensed water. The clear water is directly re-injected to the underground target layer position. A ternary complex scale cleaning agent is added before the injected water enters the fine filtration system. The method has the effects that a nanofiltration film is adopted to remove sulfate ions in the injected water, thereby solving barium and strontium scales generated by incompatibility of the injected water and formation water, and the anti-scaling rate can be more than 80 percent; the ternary complex scale cleaning agent is added in the injected water before the injected water enters the fine filtration system, thereby leading the clear water after the treatment to be capable of reducing the formation scales and further reducing the scales of the nanofiltration film of the nanofiltration system.

Description

technical field [0001] The invention relates to the field of oil recovery technology in oilfields, in particular to a method for preventing scaling of oil and water wells in oil fields, which is a method for preventing scaling of oil and water wells by using nanofiltration membranes to physically filter oilfield water and inject water to desulfate radicals. It is a technical problem that barium strontium scale is formed due to incompatibility with the water type of formation water. Background technique [0002] As an effective means of development, water injection in oil wells plays an important role in the stable production of oil fields. However, due to the incompatibility between the water type of the injected water and the water type of the formation water, the stratum is fouled and blocked, and the water injection pressure is increased; the scale of the production pipeline affects the normal oil production from time to time. The economic loss caused by the reduction of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B37/06C09K8/528
Inventor 杨全安何治武刘宁徐永高曾亚琴赵振峰张明霞董俊李宁军杨会丽刘爱华
Owner PETROCHINA CO LTD
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