Development Of Acrylamide-based Polymer Foam Stabilizer And Evaluation Of Foam System

With the increase in national demand for oil and gas resources and the development of drilling technology,large-scale unconventional oil and gas resources and deep oil and gas resources have gradually become the focus of exploration and development.Foam flooding,as a promising technology for improving and enhancing crude oil recovery,has been used in oilfield development for more than 50 years and has achieved good results,but the biggest problem facing foam flooding is the stability of foam fluids.Among them,temperature has a great influence on foam performance,especially high-temperature reservoir resources.Due to its high temperature and high salt characteristics,it limits the application of conventional foam systems in oil fields.Therefore,it is of great practical significance to carry out research on foam stability systems under high temperature conditions.In response to the above problems,a new type of high temperature resistant polymer foam stabilizer was developed in this subject.First of all,in this paper,acrylamide is used as the basic material for preparation,and anionic monomers（AMPS）,cationic monomers（DMC）and hydrop Hobic monomers（MMA）are used for multi-dimensional copolymerization.The apparent viscosity and dissolution time of the polymer solution are used as performance test indicators Through orthogonal experiment and controlled variable experiment,the initiator concentration,reaction temperature,system p H value,reaction time and the content of hydrop Hobic monomer MMA were optimized.The best preparation conditions are as follows:the mass ratio of the four monomers AM:AMPS:DMC:MMA=3.0:1.5:0.75:0.9,the reaction temperature is 65℃,the concentration of the initiator is 0.1%,the p H value of the solution 8.The reaction time is 5.5h,so as to obtain temperature-resistant and salt-resistant polymer（AM-ADM）.Secondly,the foam volume and foam half-life are used as performance test indicators to determine the optimal dosage of each agent that constitutes the foam system.In this experiment,sodiumα-olefin sulfonate（AOS）was used as the foaming agent,and the foam volume and foam half-life of the surfactant solutions with different mass fractions were measured at 25℃to determine the best mass fraction of the foaming agent.0.2%;use the synthetic AM-ADM as the foam stabilizer,through the"0.2%wt AOS+AM-ADM"two-p Hase system experiment to determine the best mass fraction of the foam stabilizer AM-ADM is 0.3%;use nano-SiO₂particles To synergistically stabilize the foam,the"0.2wt%AOS foaming agent+0.3wt%AM-ADM polymer foam stabilizer+nano-SiO₂particles"three-p Hase system experiment determined that the optimal mass fraction of nano-SiO₂particles was 0.3%.Finally,a one-dimensional sand-filled tube steam foam oil displacement experiment was carried out.The foam system used for the experiment was:A:"0.2wt%AOS foaming agent".B:"0.2wt%AOS foaming agent+0.3wt%M-ADM polymer foam stabilizer".C:"0.2wt%AOS foaming agent+0.3wt%M-ADM polymer foam stabilizer+0.3wt%nano-SiO₂particles".The results show that the three-p Hase foam system（C）has the best oil displacement performance.The final oil recovery under this condition is 6.8m L.The recovery factor is 28.4%higher than that of steam flooding.The final recovery factor is 53.8%.Eventually,the purpose of improving the recovery factor was achieved.