Preparation and research of harmless treatment agent for fracturing fluid flowback fluid
In order to simplify the complicated dosing process in the harmless treatment process of fracturing fluid flowback fluid,this paper takes Guar fracturing fluid flowback fluid as an example,through single factor test and orthogonal test to optimize the types of rubber breaker,demulsifier,anti-emulsifier and flocculant,and determine the dosage of each component,forming an"integrated"harmless treatment agent formula of fracturing fluid.The results showed that bioenzyme degummer,castor oil polyoxyethylene ether,pentaerythritol block polyoxyethylene polyoxyel ether and the combination of CPAM and PAC with a mass ratio of 3:1 were the best gel-breaker,demulsifier,anti-emulsifier and flocculant,respectively.The solid content,oil content and COD content of flowback liquid after treatment are mainly controlled by the dosage of flocculant,demulsifier and gelbreaker respectively,and there is no interference effect between additives.Combined with the single factor test results,the harmless treatment agent formula of the"integrated"flowback fluid was optimized as 800mg·L-1 bioenzyme degummer+800mg·L-1 demulsifier+500mg·L-1 anti-emulsifier+1600mg·L-1 flocculant.The formula made the flowback fluid of Guar gum fracturing fluid delamination within 60 minutes under normal temperature environment.The suspended solid content in the clear liquid is reduced to less than 3mg·L-1,the oil content is reduced to less than 5mg·L-1,and the COD is reduced to less than 50mg·L-1,which meets the standard of fracturing fluid flowback fluid reinjection.
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