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Method for deeper treatment and reuse of oil production waste water in oil field by membrane separation

A technology for oil extraction wastewater and advanced treatment, which is applied in infiltration/dialysis water/sewage treatment and other directions. Problems such as poor oil-water separation effect, to achieve good social benefits, reduce wastewater discharge, and low operating costs

Inactive Publication Date: 2003-10-29
凯能高科技工程(上海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for advanced treatment and recycling of oilfield wastewater by using membrane separation technology to solve the problem of poor oil-water separation in the prior art and difficulty in deep removal of suspended solids and organic pollutants in wastewater , salinity, oil, polymer, and the treated water cannot meet the water quality requirements for oil recovery and reinjection water, especially the high water quality requirements for the preparation of polymer oil displacement agents, resulting in waste of water resources and serious pollution of the ecological environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Accurately measure 200 liters of oil production wastewater from the oil field and add it to the material tank. Under the operating pressure of 0.4 MPa and operating temperature of 45 degrees Celsius, microfiltration operation is carried out; the concentrated liquid is collected and transported back to the joint station for oil recovery, and the filtrate enters the subsequent nanofiltration Membrane separation system; the nanofiltration operating system performs nanofiltration operation at an operating pressure of 1.5 MPa and an operating temperature of 40 degrees Celsius; the filtrate is sent to the pressurization station for use as reinjection water or polymer configuration water.

Embodiment 2

[0013] Accurately measure 200 liters of oil production wastewater from the oil field and add it to the material tank. Under the operating pressure of 1.5 MPa and operating temperature of 50 degrees Celsius, microfiltration operation is carried out; the concentrated liquid is collected and transported back to the joint station for oil recovery, and the filtrate enters the subsequent nanofiltration Membrane separation system; the nanofiltration operating system performs nanofiltration operation at an operating pressure of 2.0 MPa and an operating temperature of 35 degrees Celsius; the filtrate is sent to the pressurization station for use as reinjection water or polymer configuration water.

Embodiment 3

[0015] Accurately measure 200 liters of oil production wastewater from the oil field and add it to the material tank. Under the operating pressure of 0.5 MPa and operating temperature of 40 degrees Celsius, microfiltration operation is carried out; the concentrated liquid is collected and transported back to the joint station for oil recovery, and the filtrate enters the subsequent nanofiltration Membrane separation system; the nanofiltration operating system performs nanofiltration operation at an operating pressure of 3.0 MPa and an operating temperature of 30 degrees Celsius; the filtrate is sent to the pressurization station for use as reinjection water or polymer configuration water.

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Abstract

A process for deeply treating the sewage in oil field and reclaiming it includes ultrafiltering or microfiltering by membrane separation system to remove suspended substance, COD, oil and polymer, and nano-filtering or reverse osmosis to remove the mineralized small-molecular oil. The treated water can be used for reinjection.

Description

technical field [0001] The invention relates to a method for advanced treatment and recycling of oilfield oil production wastewater, in particular to a method for advanced treatment and recycling of oilfield oil production wastewater by using a membrane separation process. Background technique [0002] In the process of oil extraction, the oil production fluid contains a large amount of water, the water content is as low as 45% and as high as 98%. After oil-water separation, a large amount of wastewater will be generated. The wastewater mainly contains: a large amount of suspended solids, the total suspended solids are 50-200 mg per liter, CODcr is 150400 mg per liter, salinity is 3000-5000 mg per liter, total oil is 10-100 mg per liter, direct discharge of waste water not only wastes precious water resources, but also seriously pollutes and destroys The surrounding ecological environment. The existing oil-water separation process mainly adopts the traditional gravity separ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/44
Inventor 林爱莲葛文越
Owner 凯能高科技工程(上海)有限公司
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