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Oilfield poly-surfactant flooding sewage treatment process

A technology of sewage treatment and polysurfactant, which is applied in the field of sewage treatment process produced by polysurfactant flooding, can solve the problems of long running time, high investment cost, large floor area, etc., and achieves short treatment time, low investment cost, The effect of water stabilization

Inactive Publication Date: 2013-04-03
PETROCHINA CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the problems of long running time, large floor area, and high investment cost caused by the traditional process of "sedimentation + filtration" in the background technology, and to provide a kind of oilfield surface-polymerizing agent flooding production sewage treatment process, the oilfield polysurfactant flooding production sewage treatment process has short treatment time, low investment cost, simple maintenance, and qualified effluent

Method used

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  • Oilfield poly-surfactant flooding sewage treatment process

Examples

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Embodiment 1

[0032] First, the incoming water from the sewage settling tank of the oil station has a water temperature of 39°C, a pH value of 7.8, a viscosity of 2.4 mPa.s, a polysurfactant content of 390mg / L, an oil content of 2200mg / L, and a suspended solid of 80mg / L. The incoming water buffer tank stays hydraulically for 1 hour to remove most of the slick oil in the water; then the effluent is lifted by the pump and then enters the first-stage cyclone static flotation column, which generates a swirl through tangential water inflow to increase the separation of oil and water, and at the same time It is fully mixed with the dissolved air water whose circulation volume is 2 to 3 times of the influent water volume, so that the micro-bubbles in the water fully contact with the oil beads and suspended particles, and the oil beads and suspended particles are carried to the column through the static flotation section of the flotation column The upper part of the flotation tank is discharged, and...

Embodiment 2

[0034] First, the incoming water from the sewage settling tank of the oil station has a water temperature of 39°C, a pH value of 7.7, a viscosity of 3.3 mPa.s, a polysurfactant content of 620mg / L, an oil content of 2600mg / L, and a suspended solid of 120mg / L. The incoming water buffer tank stays hydraulically for 1 hour to remove most of the slick oil in the water; then the effluent is lifted by the pump and then enters the first-stage cyclone static flotation column, which generates a swirl through tangential water inflow to increase the separation of oil and water, and at the same time It is fully mixed with the dissolved air water whose circulation volume is 2 to 3 times of the influent water volume, so that the micro-bubbles in the water fully contact with the oil beads and suspended particles, and the oil beads and suspended particles are carried to the column through the static flotation section of the flotation column The upper part of the flotation tank is discharged. Af...

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Abstract

The invention discloses an oilfield poly-surfactant flooding sewage treatment process, solving the problems that the conventional settling and filtering process is long in running time, large in floor area, high in investment cost and the like. The oilfield poly-surfactant flooding sewage treatment process comprises the following specific steps: 1, performing stabilizing regulation on water quality and water amount of inflowing water by using an inflowing water buffer tank; 2, removing oil slick and most of dispersed oil from water by using a primary swirling static flotation column; 3, mixing outflowing water obtained in the step 2 with a flotation agent through a pipeline, entering a secondary swirling static flotation column, and further removing the dispersed oil, emulsified oil and suspended solids from water; and 4, sending the sewage treated in the step 3 into a two-stage double-filtering material filter, filtering till and the treated sewage reaches a pouring standard for a high-permeability strata, namely the oil content is less than or equal to 20mg / L, the suspended solid content is less than or equal to 20mg / L and the median particle size is less than or equal to 5 microns. By the oilfield poly-surfactant flooding sewage treatment process, the oil removing time is greatly shortened, the floor area is reduced, only a little of flotation agent is added in a running process, the maintenance is simple, and the outflowing water is stable and qualified.

Description

technical field [0001] The invention relates to a process for treating oilfield produced sewage, in particular to a process for treating produced sewage by polymer surface agent flooding. Background technique [0002] In order to improve oil recovery and ensure continuous and stable crude oil production during high water-cut periods, Daqing Oilfield has carried out on-site flooding tests of surface-polymerizing agents since 2005. Surface-polymerizing agent is a new type of oil-displacing agent for oilfields. It has the dual characteristics of polymer and surfactant. Through its own flow rate control and emulsification and solubilization ability, it can realize the displacement of crude oil in the formation. Compared with other oil displacement agents (ordinary polymers and ternary composite oil displacement agents), it is expected to become the main flooding agent for tertiary oil recovery due to its advantages of self-crosslinking, bacteria resistance, salt resistance, hi...

Claims

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Application Information

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IPC IPC(8): C02F9/08
Inventor 冯英明夏福军王庆吉韩丽华国胜娟
Owner PETROCHINA CO LTD
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