Synthesis and Study of a New Type of Nonanionic Demulsifier for Chemical Flooding Emulsion Demulsification

Abstract

The application of chemical flooding improves the stability of the produced emulsion, which reduces the demulsification efficiency of conventional demulsifiers. To improve the demulsification effect, in this paper, a new multibranched nonanionic polyether demulsifier, FYJP, was prepared by grafting carboxylate based on a nonionic demulsifier. The FYJP demulsifier could generate an initiator through p-tert-butylphenol, triethylenetetramine, and methanol, which was polymerized with ethylene oxide (EO) and propylene oxide (PO) to produce a nonionic polyether demulsifier. Sodium chloroacetate was used to modify the polyether demulsifier to obtain a new type of nonanionic polyether demulsifier. The FYJP polyether demulsifier was characterized by the hydrophilic−lipophilic balance (HLB) value, relative solubility (RSN), and surface activity of the demulsifier, and the demulsification mechanism was analyzed by a microscopic demulsification process test, and the effect of demulsifier dosage on the demulsification effect was discussed. Meanwhile, a dehydration test was carried out. The experimental results showed that the highest dehydration rate of the demulsifier was 94.7% at 85 °C, 100 ppm demulsifier dosage, 50 mL of a W/O emulsion, and 120 min demulsification time. The abovementioned studies show that FYJP is an effective demulsifier for chemical flooding emulsions, and this work promises to provide a reference for future demulsifier research.

Screening and Demulsification Mechanism of Fluorinated Demulsifier Based on Molecular Dynamics Simulation

“…The tested oil sample was produced from fluid from a block in Liaohe Oilfield. Fluorinated demulsifiers were synthesized by using trifluoromethyl phenol, formaldehyde and other raw materials as initiators and then synthesized through polymerization reaction with propylene oxide and ethylene oxide [ 20 ]. The physiochemical characteristics are shown in Table 1 .…”

Preparation of hydrophobic nano calcium carbonate and its application in EOR

“…The primary cause is that the residual oil in the low permeability area cannot be flooded out because to the severe formation heterogeneity and poor sweep efficiency [2], so the use of chemical treatment agents to improve oil recovery is necessary. Emulsion flooding is a typical chemical oil flooding method [3][4][5]. Oil and water are emulsified by emulsifying agent to form O/W emulsion, which can effectively reduce oil viscosity, and increase oil fluidity, and reduce oil-water interface tension, and finally enhance displacement efficiency [6][7][8].…”

The Influence of Newly Synthesized Demulsifiers on the Interfacial Rheological Properties of a Naturally Occurring Water/Oil Emulsion

“…After 120 min, the maximum dehydration rate of the demulsifier was 94.7% for a dosage of 100 ppm at 85 °C. 25 …”

“…After 120 min, the maximum dehydration rate of the demulsifier was 94.7% for a dosage of 100 ppm at 85 °C. 25 There are a wide variety of commercial demulsifiers, including polymeric surfactants such as copolymers of polypropylene oxide and polyethylene oxide, alkyl phenol formaldehyde resin, and a mixture of various surface-active compounds. 16,26−28 In this study, three novel polymeric nonionic surfactants (DA, DB, and DC) were synthesized by reacting 4hydroxybenzenesulfonic acid with dodecanoyl chloride to produce 4-(dodecanoyloxy)benzenesulfonic acid, which was then esterified by three-block copolymers with different molecular weights (1000, 3000, and 5800).…”

“…Wei et al synthesized a multibranched nonanionic polyether demulsifier named FYJP. After 120 min, the maximum dehydration rate of the demulsifier was 94.7% for a dosage of 100 ppm at 85 °C …”