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A high-efficiency treatment method for oilfield complex oil-water emulsion
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A technology for preliminary treatment of crude oil, applied in the petroleum field, can solve problems that may not be effective, and achieve the effects of reducing oil content, eliminating the formation of complex oil-water emulsions, and changing the polar environment
Active Publication Date: 2018-08-17
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology
Since crude oil emulsion has obvious selectivity to demulsifier and reverse phase demulsifier during demulsification and dehydration, the demulsifier that is very effective for some oil fields or oil wells may not be effective for other oil fields or oil wells
At the same time, most demulsifiers cannot avoid the formation of special oil-water emulsion layers and aged oils, and new technologies and methods are required to deal with such complex oil-water emulsions
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Embodiment 1
[0022] (1) Take 100 mL of crude oil from heavy oil field C and heat it in a water bath at 75°C, add 8 mg of demulsifier DP32, shake it manually and mix well.
[0023] (2) Take 1.5 mg of a mixed solution composed of n-hexane, cyclohexanol and diethylene glycol methyl ether, wherein the mass ratio of each component is n-hexane: cyclohexanol: diethylene glycol methyl ether=1:2:4 , manual shaking to mix evenly. According to the industry standard SY / T5281-2000, the performance of demulsification and dehydration was evaluated, and the dehydration rate at 30 minutes and 60 minutes, the oil content of the dewatered sewage and the oil-water interface were recorded respectively.
Embodiment 2
[0025] (1) Take 100 mL of crude oil from heavy oil field C and heat it in a water bath at 75°C, add 6 mg of demulsifier DP61, shake and mix by hand.
[0026] (2) Get 4 mg of a mixed solution composed of n-pentane, isohexyl alcohol and diethylene glycol butyl ether, wherein the mass ratio of each component is n-pentane: isohexanol: diethylene glycol butyl ether=1:2:6 , manual shaking to mix evenly. According to the industry standard SY / T5281-2000, the performance of demulsification and dehydration was evaluated, and the dehydration rate at 30 minutes and 60 minutes, the oil content of the dewatered sewage and the oil-water interface were recorded respectively.
Embodiment 3
[0028] (1) Take 100mL of crude oil from the polymer injection oilfield P and heat it in a water bath at 65°C, add 15mg of demulsifier DP32, shake it manually and mix it evenly.
[0029] (2) Take 3 mg of a mixed solution composed of n-butane, 1,2-propylene glycol, and diethylene glycol dimethyl ether, wherein the mass ratio of each component is n-butane: 1,2-propylene glycol: diethylene glycol two Methyl ether = 1:3:8, shake manually to mix well. According to the industry standard SY / T5281-2000, the performance of demulsification and dehydration was evaluated, and the dehydration rate at 30 minutes and 60 minutes, the oil content of the dewatered sewage and the oil-water interface were recorded respectively.
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Abstract
The invention provides a method for efficiently demulsifying and dehydrating oil field complex oil-water emulsion. The method comprises the following steps: 1) adding a demulsifier into crude oil and mixing uniformly to obtain primarily treated crude oil; 2) adding a mixture of alkane, alcohol and alcohol ether into the primarily treated crude oil and mixing uniformly, wherein the mixture of the alkane, the alcohol and the alcohol ether consists of three components, namely alkane, monohydric alcohol or polyhydric alcohol, and alcohol ether or alcohol ether ester. The method for efficiently demulsifying and dehydrating the oil field complex oil-water emulsion, provided by the invention, specially aims at a special oil-water emulsifying layer (an intermediate transition layer), ageing oil and the like which are easily formed after dehydration is conducted by singly adopting a demulsifier, the stability of an interfacial film of the oil-water emulsifying layer is effectively broken and the polar environment of interfacial phase is changed on the basis of not changing the use variety and the use mode of the original demulsifier by cooperatively using the specially composed mixture of the alkane, the alcohol and the alcohol ether, and the solubilization effect on asphaltene, colloid, polymers and the like is achieved.
Description
technical field [0001] The invention belongs to the petroleum field, and in particular relates to an efficient treatment method for complex oil-water emulsions in oilfields. Background technique [0002] In the process of oilfield produced fluid treatment, we often face the problem of demulsification and dehydration of various complex oil-water emulsions. Especially for heavy oil fields, chemical flooding fields, etc., due to the natural emulsifiers (mainly wax crystals, asphaltenes, colloids, naphthenic acids, etc.) in the crude oil emulsion, and the widely used polymer oil displacement agents (mainly oil-displacement polymers, surfactants, etc.), the stability of the produced crude oil emulsion is extremely strong, which leads to the gradual deterioration of the demulsification and dehydration effect, and brings a series of follow-up problems. On the one hand, in the process of demulsification and dehydration, a very stable special oil-water emulsion layer (also known as ...
Claims
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