Treatment technology of reinjecting heavy oil wastewater into low-permeability reservoir

A technology of heavy oil sewage and treatment process, which is applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, mining wastewater treatment, etc. It can solve the problem that the effluent cannot meet the water quality requirements of low-permeability oilfields, and there is no bacteria removal process , lengthy treatment process and other issues, to achieve the effect of prolonging the cleaning cycle and service life, stable treatment effect, and reasonable treatment process

Inactive Publication Date: 2015-12-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These patents are all aimed at the treatment process of oil pumping sewage. The treatment process is lengthy, the investment is large, the treatment time is long, and there is no removal process for the content of suspended solids, median particle size, bacteria, etc. in the sewage, and the effluent cannot reach a low level. Permeable Oil Field Water Quality Requirements

Method used

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  • Treatment technology of reinjecting heavy oil wastewater into low-permeability reservoir
  • Treatment technology of reinjecting heavy oil wastewater into low-permeability reservoir
  • Treatment technology of reinjecting heavy oil wastewater into low-permeability reservoir

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In the heavy oil sewage of an oilfield A, the raw water contains 212.85 mg / L oil, 1356.0 mg / L COD, 59.2 mg / L suspended solids, 97.56 μm median suspended solids particle size, and 0.202 mm / a corrosion rate. Utilize the method of the present invention to process and reinject the low-permeability oil field, the concrete steps are as follows:

[0034] (1) Multi-effect degreasing treatment

[0035] The heavy oily sewage first enters the multi-effect degreasing device, and the multi-effect degreasing device is sequentially equipped with a gravity settling area, a coalescence degreasing area, and an inclined plate settling area; the heavy oily sewage first undergoes preliminary gravity separation in the gravity settling area to remove floating Oil and dispersed oil with larger particle size; then, the sewage enters the coalescing and degreasing area, relying on the coarse-grained materials in it, through wetting and collision, the oil droplets become larger; finally, the sewag...

Embodiment 2

[0053] In the heavy oil sewage of an oilfield B, the raw water contains 106.2mg / L oil, 897.5mg / L COD, 41.6mg / L suspended solids, 77.62μm median particle size of suspended solids, and 0.198mm / a corrosion rate. Utilize the method of the present invention to process and reinject the low-permeability oil field, the concrete steps are as follows:

[0054] (1) Multi-effect degreasing treatment

[0055] The heavy oily sewage first enters the multi-effect degreasing device, and the multi-effect degreasing device is sequentially equipped with a gravity settling area, a coalescence degreasing area, and an inclined plate settling area; the heavy oily sewage first undergoes preliminary gravity separation in the gravity settling area to remove floating Oil and dispersed oil with larger particle size; then, the sewage enters the coalescing and degreasing area, relying on the coarse-grained materials in it, through wetting and collision, the oil droplets become larger; finally, the sewage en...

Embodiment 3

[0073] In the heavy oil sewage of an oilfield E, the raw water contains 80.42mg / L oil, 674.5mg / L COD, 39.7mg / L suspended solids, 67.24μm median particle size of suspended solids, and 0.189mm / a corrosion rate. Utilize the method of the present invention to process and reinject the low-permeability oil field, the concrete steps are as follows:

[0074] (1) Multi-effect degreasing treatment

[0075] The heavy oily sewage first enters the multi-effect degreasing device, and the multi-effect degreasing device is sequentially equipped with a gravity settling area, a coalescence degreasing area, and an inclined plate settling area; the heavy oily sewage first undergoes preliminary gravity separation in the gravity settling area to remove floating Oil and dispersed oil with larger particle size; then, the sewage enters the coalescing and degreasing area, relying on the coarse-grained materials in it, through wetting and collision, the oil droplets become larger; finally, the sewage en...

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Abstract

The invention belongs to the technical field of wastewater treatment, and particularly relates to a treatment technology of reinjecting heavy oil wastewater into a low-permeability reservoir. The treatment technology specifically comprises the following steps of multi-effect oil removing treatment: removing oil spill, dispersed oil and partial suspended matters in wastewater; dual-effect air flotation treatment: removing emulsified oil and colloid type suspended matters in the wastewater; activated sludge treatment; sedimentation treatment: carrying out sludge-water separating; bio-contact oxidation treatment: further reducing organic matters and removing extracellular polymeric substances; micro-flocculation and dual-medium filtration treatment; membrane filtration treatment. After the wastewater passes through a membrane filtration device, the content of oils in the wastewater is less than 1.0mg/L, the content of suspended matters is less than 1.0mg/L, the median diameter of the suspended matters is less than 1.0mum, the corrosion rate is less than 0.076mm/a, and all indexes are lower than A1-stage water quality standard required by the low-permeability reservoir. The treatment technology disclosed by the invention has the advantages that the treatment technology is reasonable, the operation is simple, and the treatment effect is stable; crude oil can be recycled; the cleaning period and the service life of a membrane are long; meanwhile, and the insufficient injection problem of the low-permeability reservoir is solved, and the resource utilization of the wastewater is realized, so that the treatment technology can be widely used for reinjecting the heavy oil into the low-permeability reservoir.

Description

technical field [0001] The invention relates to a treatment method for oilfield sewage, in particular to a treatment process for reinjecting heavy oil sewage into low-permeability oilfields. technical background [0002] Most of the heavy oil fields in my country adopt the method of steam injection mining, and the process of crude oil extraction produces a large amount of sewage. At present, the state strictly restricts the discharge of sewage. Shengli Oilfield has achieved "zero sewage discharge". The disposal of heavy oil sewage has become a difficult problem restricting the development of heavy oil. In low-permeability oilfields, due to the small formation pore-throat radius and low permeability, the requirements for injection water quality are strict. The "Recommended Indexes and Analysis Methods for Injection Water Quality in Clastic Reservoirs" (SY / T5329) requires A1-grade water quality. Therefore, currently Most of them are mined by water injection. It is of great s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/10
Inventor 潘永强王静徐鹏徐闯胡婧孙刚正宋欣吴晓玲刘涛谭晓明
Owner CHINA PETROLEUM & CHEM CORP
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