Process for oil field oil-containing sewage sludge and utilizing method thereof

Abstract

The invention relates to the process and utilization method of the oily sludge, in particular to the process and utilization of the oily sludge produced by the oilfield extraction sludge, the sewage disposal plant and the storage terminal. The scheme is that the oily sludge enters a swirler oil eliminator and is added with oil removal agents, releases the oil and enters a dirty oil tank; the deoiled sludge enters a sludge concentrating tank; sludge dehydrating agents are added in the concentrating tank based on the proportion and enter horizontal centrifuge via a secondary lift pump to dehydrate; the dehydrated water enters the coming liquid pipeline of the sewage disposal system; the dehydrated sludge is mixed with slack coal based on the proportion; the binder is added to form the coal which enters a shape coal machine to make the shape coal. The oil removal agents effectively recycle the sludge oil; the binder enhances the anti-extrusion strength and reduces the energy consumption; the shape coal has the advantages of high heat value, low burning point and low production cost, which improves the utilization of the residual value and reduces the utilization of the clay. Meanwhile, the ash and slag of the shape coal reaches the discharge standard of the sludge for agricultural use and avoids the environmental protection.

Description

technical field [0001] The invention relates to a treatment and utilization method of oily sludge, in particular to the treatment and utilization of oily sludge produced in oilfields, sewage treatment plants and oil tank farms. Background technique [0002] At present, domestic and foreign petroleum companies and research institutes have made many attempts in the treatment and utilization of oilfield sludge, which can be summarized as follows: [0003] Solidify to make building materials, the method is to add certain curing agent, filler and cement in proportion to solidify after degreasing and dehydrating the oily sludge. Both the oil content and water content of the sludge must be reduced very low, the operation and treatment costs are high, the floor area is large, and secondary pollution may be caused after solidification. [0004] Sintering to make building materials is to make oilfield sludge after salt washing, degreasing and dehydration, and then mix it with clay in...

AI Technical Summary

Problems solved by technology

However, this method has the following problems: (1) The particle size range of the solid particles in the sludge is narrow, which is only suitable for plugging medium and high permeability reservoirs with small pore throats, and cannot be used for large pores or ultra-high permeability reservoirs; ( 2) There is a lot of crude oil in the sludge, the plugging strength is not enough, and the plugging period is short; (3) The sludge is decomposed after being washed by injected water or absorbed by rocks, resulting in a decrease in the success rate of plugging, and even pollutes medium and low permeability Floor

[0007] Using oily sludge as a filler in rubber products, calcium carbonate is the most used filler in rubber products, while oilfield sludge is rich in calcium carbonate, and some other minerals can also be used as fillers, so it can be Through the treatment of oilfield sludge as a filler in rubber products, the research shows that oilfield sludge used as a filler in rubber products has good reinforcing filling performance and is well dispersed in the rubber compound. However, the sludge treatment process of this method is complicated, and a series of complex processes such as wet screening to remove gangue residues, water washing to remove salt, and electromagnetic separation to remove iron are required. Therefore, this method has high sludge treatment costs and large investment costs, and is not suitable for oil fields. sludge treatment

[0008] Chinese patent 02133117.0 discloses a treatment method for oily sludge. The method is to mechanically dehydrate the oily sludge, then mix it with extraction solvent oil for preheating and dehydration, carry out coking in the liquid phase, use the solid phase as fuel, and perform thermal extraction-dehydration After the gas phase is condensed and dehydrated, oil and water are separated. This method requires related coking equipment and devices, and the process temperature control is complicated. At the same time, it does not disclose how the solid phase is processed into fuel.

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