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A method for increasing the viscosity of polymer solution prepared from oilfield sewage

A technology for preparing polymers and oilfield sewage, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. It is difficult to maintain and use, and the composition of oilfield sewage is complex, so as to achieve the effect of easy control and maintenance, low treatment and operation cost, and low cost

Active Publication Date: 2015-09-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the complex composition of oilfield sewage, the use of sewage to prepare polymer solutions will degrade the viscosity of polymer solutions to varying degrees. The main reasons are the salinity of sewage, chemical oxygen consumption, and sulfate-reducing bacteria and saprophytes contained in sewage. Bacteria, etc. lead to serious degradation of polymers; and when the content of suspended solids in sewage is high, the solubility and stability of polymers will also deteriorate, and even cause polymer flocculation and sedimentation. Therefore, corresponding sewage treatment technologies are used for oilfields Proper treatment of sewage to increase the viscosity of the polymer solution prepared from sewage is of great significance to the development of tertiary oil recovery and the stable production and efficiency of oilfields
[0004] CN200810137178 and CN101948201A use reverse osmosis and nanofiltration membrane equipment to reduce sewage mineralization, thereby increasing the viscosity of polymer solution prepared from oilfield sewage; CN101357790 utilizes the high temperature of sewage itself, and uses low-temperature evaporation technology to eliminate the impact of impurity ions in sewage on polymer viscosity ;The water quality after these two methods is good, the viscosity of the prepared polymer solution is higher than that of clear water, but the operating conditions are harsh, the equipment maintenance is difficult and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Taking biochemical sewage from an oil field, the sewage is first filtered through a multi-media filter to remove some suspended solids, etc., and then enters the ultrafiltration system. The ultrafiltration membrane material is polyvinylidene fluoride (PVDF), and the filtration method is full-flow filtration. The flux is 50 L / m 2 ·H, the water after ultrafiltration and filtration enters the ion exchange equipment, the resin used is the bleach softening cation resin (001*7), the working speed is 20m / h, and then it is filled with nitrogen and deoxygenated to dissolve in the sewage The oxygen content is less than 0.5 mg / L, and the water quality comparison results before and after oilfield sewage treatment are shown in Table 1. The polymer PAM1 was prepared with oilfield sewage before and after treatment, and the polymer concentration was 1500 mg / L. The initial viscosity of the solution and the stability of the solution viscosity at 80°C were measured. The measurement time was...

Embodiment 2

[0026] In addition, the biochemical wastewater from an oil field is directly filtered in the ultrafiltration system. The ultrafiltration adopts cross-flow filtration. The recovery rate of the system is 92% and the operating flux is 60 L / m. 2 ·H, the sewage filtered by ultrafiltration enters the ion exchange equipment, the resin used is DOWEX? MARATHON? C, the working speed is 17m / h, after the resin is treated, the sewage is deoxygenated with a deaerator to make the sewage dissolved The oxygen content is less than 0.5 mg / L, and the water quality comparison results before and after oilfield sewage treatment are shown in Table 3. The polymer PAM2 was prepared with oilfield sewage before and after treatment, and the polymer concentration was 1000 mg / L. The initial viscosity of the solution and the stability of the solution viscosity at 80℃ were measured. The measurement time was 10 days. The comparison results are shown in Table 4.

[0027] table 3

[0028] Analysis Project

[0029...

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Abstract

The invention discloses a method for improving the viscosity of a polymer solution prepared from oilfield sewage, belonging to the field of oilfield sewage treatment. The oilfield sewage is filtered by a filter or directly enters an ultrafiltration system to remove macromolecular organisms, bacteria and the like, the oilfield sewage is treated by ion exchange equipment to remove high-valent positive ions seriously influencing the viscosity of the polymer solution, and the dissolved oxygen in the sewage is removed through a deoxygenation device. The method is mature in technology and simple to operate and easy to implement; the treated sewage is used for preparing a polymer solution, thus the initial viscosity of the polymer solution is greatly improved; moreover, the viscosity stability of the polymer solution is guaranteed, and the treatment cost is saved.

Description

Technical field [0001] The invention relates to the field of oilfield sewage treatment, in particular to a method for increasing the viscosity of a polymer solution prepared by oilfield sewage. Background technique [0002] Since the 1980s, oilfields have basically used clean water to prepare polymer solutions to inject into the formations. With the continuous expansion of oil production, the consumption of fresh water has increased. If the wastewater produced by the oilfield cannot be balanced with the reinjection, the excess wastewater must be After treatment, it is discharged outside, which not only increases ground operation costs, but also causes environmental pollution. The use of oilfield sewage to prepare polymer solution injection is an effective method to solve this problem. [0003] Because the composition of oilfield sewage is very complex, the viscosity of polymer solution can be degraded to different degrees by using sewage to prepare polymer solution. The main reaso...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F1/42C02F1/44
Inventor 平春霞张英雄邢琳曹宗仑
Owner CHINA PETROLEUM & CHEM CORP