High-sand and high-viscosity oily sludge pretreatment method and pretreatment system

Abstract

The invention relates to a pretreatment method for high-sand and high-viscosity oily sludge and a treatment system for high-sand and high-viscosity oily sludge using the method. In the method, the sludge is subjected to multi-stage tearing and screening, and the tearing and screening at each level is achieved by spraying or impacting high-temperature and high-pressure steam to realize sludge crushing and dispersion, and large solids are screened out, and a drum desanding fluidization device is used to treat the sludge. The sludge after multi-stage tearing and screening is separated from mud and sand and further fluidized to form fluidized sludge. The system includes a multi-stage tearing and screening device and a drum desanding fluidization device. The mud output of the multi-stage tearing and screening device is connected to the drum desanding fluidization device. The multi-stage tearing and screening device is equipped with upper and lower distribution The multi-stage vibrating screen and the steam injection device located above each vibrating screen, the drum separator in the feeding area of ​​the drum desanding fluidization device. The invention is suitable for pretreatment of high-sand and high-viscosity oily sludge, so as to adapt to the treatment requirements of subsequent conventional centrifuge dewatering equipment.

Description

technical field [0001] The invention relates to a pretreatment method for high-sand and high-viscosity oily sludge and a treatment system for high-sand and high-viscosity oily sludge using the method, which is mainly used for oily sludge with high sand and high viscosity and other similar sludge in oilfields Mud pretreatment. Background technique [0002] With the development of the national energy strategy, in order to ensure crude oil production, major oilfields are gradually using the recoverable reserves of low-permeability or even ultra-low-permeability oil layers; Chemical flooding methods such as polymers, polysurfactants, and three-way oil displacement agents are used to implement tertiary oil recovery to achieve the purpose of improving oil recovery and ensuring crude oil production. The oily sludge generated during the development and production of this part of the oilfield generally has The characteristics of high sand content and high viscosity, especially the o...

AI Technical Summary

Problems solved by technology

For this part of the sludge, the oily sludge treatment station currently built in the oil field shows great incompatibility: First, dewatering equipment such as centrifuges are either blocked by high-viscosity sludge and unable to operate, or appear due to high sand content. Second, due to the high viscosity of this part of the sludge, to maintain the continuous operation of the sludge plant, we can only operate at a reduced load, resulting in the sludge plant not being able to realize the original Design capacity treatment, there will be a large amount of sludge to be treated every year with no way out

[0003] After the investigation and analysis of the oily sludge treatment station that has been built, the main reason for the above phenomenon is that the pretreatment methods and equipment used in the built oily sludge treatment station cannot realize the effective treatment of this kind of high sand content and high viscosity sludge. : First, the viscous agglomerated sludge cannot be fully broken and dispersed before the material enters the centrifuge to realize the evacuated fluidized sludge; the second is that the sand in the material cannot be as much as possible before the material enters the centrifuge. removal, because centrifuge dewatering equipment is particularly sensitive to the sand content in the material

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