Method for reducing scaling between oil field oil extraction transportation system and stratum

A technology for gathering and transportation systems and formations, which is applied in the direction of separation methods, chemical instruments and methods, and grease/oily substances/suspton removal devices, etc., which can solve the problem of reducing scaling between oil production gathering and transportation systems and formations in oil fields, and the large amount of discharged waste water , formation damage and other issues, to achieve the effect of ensuring high-efficiency, continuous and stable production, improving utilization rate, and preventing scaling

Active Publication Date: 2009-12-09
OCEAN UNIV OF CHINA
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Problems solved by technology

[0008] The purpose of the present invention is to overcome the shortcomings of the prior art, aiming at the problems of serious fouling, serious formation damage, large amount of discharged waste water, and serious environmental pollution in the above-mentioned oilfield produced water treatment and cleaning and mixed injection, it is proposed to use membrane separation Combination of technology and chemical method to reduce fouling of oil production gathering and transportation system and formation

Method used

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  • Method for reducing scaling between oil field oil extraction transportation system and stratum
  • Method for reducing scaling between oil field oil extraction transportation system and stratum
  • Method for reducing scaling between oil field oil extraction transportation system and stratum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1, (clear water is seawater, mixes direct water injection)

[0029] Its process is as follows figure 1 As shown, the ratio of produced water: clean water is 1:0.5, the water type of produced water is CaCl2 type, and the clean water is seawater.

[0030] In the first step, the produced water 1 passes through the oil separator 2 and the air flotation device 3 to remove suspended oil droplets, partially emulsified oil and dissolved oil, so that the oil content in it is lower than 10mg / L, and then enters the multi-media filter or laminated filter Self-cleaning filter 4 removes solid suspended particles with a particle size of 5 microns or more, and then removes colloids, residual oil, suspended solids, CODcr, polymers, etc. in the water through the dead-end ultrafiltration membrane separation device 5, so that ultrafiltration water The sludge density index (SDI) drops below 3.0, the turbidity is less than 0.1NTU, and the total oil is less than 1mg / L. The ultra-f...

Embodiment 2

[0035] Embodiment 2, (clear water is sea water, mixes and dilutes preparation polymer)

[0036] Its process is as follows figure 2 As shown, the ratio of produced water: clean water is 1:0.5, the water type of produced water is CaCl2 type, and the clean water is seawater.

[0037] According to the first step of embodiment 1, second step operation, wherein, clear water is sea water.

[0038] The average recovery rate of the ultrafiltration of the produced water and the clear water treatment device is 95%, and the recovery rate of the nanofiltration is 60%.

[0039] In the third step, after the nanofiltration demineralized water of the produced water and the nanofiltration demineralized water of the clear water are fully mixed through the static mixer 18, a part of the mixed water enters the polymerization device 19, and a high molecular weight water-soluble water-soluble compound with a molecular weight of 20 million to 45 million is added. Polyacrylamide 20, formulated poly...

Embodiment 3

[0041] Embodiment 3, (clear water is brackish water, mixing direct water injection)

[0042] Its process is as follows figure 1 As shown, the ratio of produced water: clean water is 1:0.6, the water type of produced water is CaCl2 type, and the clean water is brackish water.

[0043] According to the first step of embodiment 1, second step operation, wherein, clear water is brackish water.

[0044] The ultrafiltration recovery rate of produced water and clean water treatment device is 95%, and the recovery rate of nanofiltration is 70%.

[0045] In the third step, the nanofiltration softened water of clean water and the nanofiltration softened water of produced water enter the static mixer 16 and are fully mixed.

[0046] In the fourth step, the nanofiltration concentrated water of the produced water and the nanofiltration concentrated water of the clean water enter the concentrated water static mixer 12 to react and form precipitates, and then enter the self-cleaning filter...

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Abstract

The invention relates to a method for reducing scaling between the oil field oil extraction transportation system and stratum. Produced water is processed by oil removal and air floatation followed by being removed of solid suspended particles by a filter and of impurity in water by a dead end ultrafiltration membrane separation device, and the ultrafiltration produced water is introduced into a nanofiltration membrane separation device to obtain nanofiltration softened water of the produced water; nanofiltration softened water of clear water is prepared; nanofiltration softened water of clear water and nanofiltration softened water of the produced water are fully mixed by a static mixer to be taken as injected water or water used for preparing polymer mother liquor; nanofiltration softened water of clear water and nanofiltration softened water of the produced water are fully mixed to take as oil extraction re-injection water or water used for diluting the polymer mother liquor. The invention has the advantages that scaling components are radically removed, and the water quality after processing does not harm the stratum, thus improving oil displacement efficiency and oil field extraction efficiency, realizing zero emission of waste water, and having good economic and environmental benefits.

Description

Technical field: [0001] The invention relates to a method for reducing fouling of the oil production gathering and transportation system and the stratum in an oil field, in particular to a method for advanced treatment and recycling of produced water by using a membrane separation process in the offshore oil production process, and prevention of gathering and transportation during cleaning and mixed injection. The system and formation fouling method belong to the technical field of improving oil recovery. Background technique: [0002] In the process of oil extraction, the oil production fluid contains a large amount of water, the water content is generally above 60%, some have exceeded 90%, and even the highest reaches 98%. After the separation of oil and water, a large amount of wastewater is produced. The wastewater mainly contains: a large amount of suspended solids, the total suspended solids are 50-200mg / L, the chemical oxygen demand (CODcr) is 150-400mg / L, and the sal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/02E21B43/22C02F1/44C02F1/40C02F1/24
Inventor 苏保卫高学理高从堦
Owner OCEAN UNIV OF CHINA
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