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Dispersion and treatment method of aggregated sludge

A sludge and dispersion technology, applied in dehydration/drying/concentrated sludge treatment, mining wastewater treatment, etc., can solve the problems of difficult sludge treatment, waste of resources, secondary pollution, etc., and achieve good application prospects, The effect of good compatibility

Active Publication Date: 2017-06-30
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existence of organic polymer flocs makes it extremely difficult to treat aggregate-containing sludge. At present, most land oil fields are disposed of by burial or incineration, which not only causes waste of resources, but also causes secondary pollution.

Method used

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  • Dispersion and treatment method of aggregated sludge
  • Dispersion and treatment method of aggregated sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] (1) Separation of oil-containing sludge

[0058] Acrylic acid-maleic acid copolymer with a number average molecular weight of 2000, sodium silicate and sodium citrate were dissolved in mineralized water at a mass ratio of 1:8:3 to obtain a separating agent with a mass percentage of 20%.

[0059] Weigh 1kg of the sample containing poly-oil sludge into a beaker, add 1L of the above-mentioned separating agent, place it in a constant temperature water bath and raise the temperature to 70°C, stir at constant temperature for 30min, and the stirring speed is 600rpm. Then pour it into a sedimentation and separation bottle, and keep it in a 70°C drying oven for 30 minutes. Take it out after half an hour, the sample presents obvious "oil, water, mud" three-phase layering (see attached figure 1 ), the upper layer is a black oil layer, the middle layer is a sewage layer, and the lower layer is a sludge-containing layer. Filter and separate the lower layer of sludge containing agg...

Embodiment 2

[0066] (1) Separation of oil-containing sludge

[0067] According to the step (1) of embodiment 1, only the separating agent used is replaced with the separating agent prepared according to the following method:

[0068] Acrylic acid-maleic acid copolymer with a number average molecular weight of 1800, sodium silicate and sodium citrate were dissolved in mineralized water at a mass ratio of 3:7:5 to obtain a separating agent with a mass percentage of 30%.

[0069] (2) Shearing and grinding of aggregated sludge

[0070] Take 50g of the above-mentioned dried aggregate-containing sludge sample in a beaker, add 200g of water, and configure it as an aqueous solution with a mass concentration of 20%. A high-speed powerful mixer was used to shear and stir the sludge aqueous solution, and the stirring speed was set at 2000 rpm. After stirring for about 8 minutes, a uniformly mixed sludge aqueous solution with smaller particles was obtained. Afterwards, the solution was ground in a h...

Embodiment 3

[0075] (1) Separation of oil-containing sludge

[0076] According to the step (1) of embodiment 1, only the separating agent used is replaced with the separating agent prepared according to the following method:

[0077] Acrylic acid-maleic acid copolymer with a number average molecular weight of 2500, sodium silicate and sodium citrate were dissolved in mineralized water at a mass ratio of 8:2:3 to obtain a separating agent with a mass percentage of 20%.

[0078] (2) Shearing and grinding of aggregated sludge

[0079] Take 50 g of the above-mentioned dried aggregate-containing sludge sample in a beaker, add 150 g of water, and configure it as an aqueous solution with a mass concentration of 25%. A high-speed powerful mixer was used to shear and stir the sludge aqueous solution, and the stirring speed was set at 2000 rpm. After stirring for about 10 minutes, a uniformly mixed sludge aqueous solution with smaller particles was obtained. Afterwards, the solution was ground in ...

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Abstract

The invention discloses a method for dispersing and treating aggregate-containing sludge. The method for dispersing and treating comprises the following steps: 1) configuring the sludge containing polymers and water into a suspension, and then performing shearing, stirring and grinding on the suspension in turn to obtain sludge particles containing polymers; 2) preparing step 1 ) The resulting poly-containing sludge particles, sludge dispersant and polymer solution are mixed, stirred, and the dispersion of the poly-containing sludge is completed; wherein, the polymer solution is an aqueous solution of a polyacrylamide polymer oil displacing agent . The method uses mechanical shearing and grinding to reduce the particle size of the aggregated sludge to a level that matches the pores of the formation, and uses the viscosity of the polymer solution itself and the polymer dispersant to stably suspend the sludge particles in the polymer solution , forming a long-term stable dispersion of polymer-containing sludge / polymer suspension, which has a good application prospect in polymer flooding and reinjection profile control.

Description

technical field [0001] The invention belongs to the field of petroleum, and relates to a method for dispersing and treating aggregated sludge. Background technique [0002] Polymer flooding is an important enhanced oil recovery technology. Its principle is to increase the viscosity of the injected water and expand the swept volume by adding high molecular weight polyacrylamide and other oil displacement agents to the injected water, so as to achieve the purpose of enhanced oil recovery. While the oil recovery rate is significantly improved, polymer injection oilfields are also facing serious sludge problems. There are two main sources of polymer-containing oil sludge: one is that the viscosity of the produced fluid increases with the increase of the returned polymer concentration, resulting in a substantial increase in the amount of sediment carried from the formation; the other is that the produced fluid The demulsifier, reverse phase demulsifier, water clearing agent and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/14C02F103/10
Inventor 翟磊靖波王秀军檀国荣张健
Owner CHINA NAT OFFSHORE OIL CORP