Support Type Salt Surfactant In The Heavy Oil Viscosity Reduction, Foam Drilling Applications And Performance Evaluation

Branched salt resisting surfactants refer to the surfactants having several branches which have been synthesized in our laboratory.It is found that , at room temperature, the surfactants can reduce 200000 mg·L^–1salt water′s surfacetension from 80 mN·m^-1 to 40 mN·m^-1,and kept transparent. This is the general surfactant not have. And it enable high viscosity heavy oil of 270000mP·s(50℃)dispersed into water, it′s viscosity can reduce to 30 mP·s. That is to say it do very well in high heavy oil′s emulsifying and viscosity reducing to the purpose of mining. The field experiments was also proof of its feasibility.In tertiary oil recovery, surfactants′properties were decreased because of stratum adsorption.Most surfactants having hige stratum adsorption amount, decreased their displacement efficiency, and the cost was hige. Experiments proved that, under the same reaction conditions, branched salt resisting surfactants-α-olefine polyether derivative can lead high-salinity solution to low surface tension, meanwhile, its adsorption in geological media including montmorillonite, carbonate and silicate decreased obviously with solution's salinity increasing, while the common surfactant as petroleum sulfonate's surface activity decreased and the adsorption in stratigraphic medium increased. The mechanism ofα-olefine polyether derivative's resisting stratigraphic medium's adsorption was elaborated also. Because of high salt-resistence,α-olefine polyether derivative's can resist media's bulge effectively and decrease media's absorption, while combining with KCl.In the first chapter of the thesis, from experimental methods, experiment results and discussions the emulsifying and viscosity reducing to the high-salinity heavy oil and resisting stratigraphic medium's adsorption of the branched salt resisting surfactants were introduced. Also,the mechanisms of it′s salt resisting and adsorption resisting were StudyedFoam as the drilling fluid of the unbalance drilling technology can effectively protected the gas and oil wells. Foam drilling technology has been successfully applied to the Oilfield, but it was still less studied to the high-salinity stratum foam drilling. Brilling foaming agents was surfaces, and it was mainly anionic surfactant. But a lot of anionic surfactants was salting-out in the high-salinity water and easily deposited when the calcium and magnesium existed,so as to lose surface activity. Some surfactants will be factored in the high temperature. So there are great significance for salt and temperature resistance foaming agents applied to the drilling. The expts showed that branched salt resisting surfactants have the properties of resisting of salt and temperature as the foaming agents.A great deal of work was done during the master's time to select foam drilling fluid formula for high-salinity stratigraphic. In the second chapter of this thesis, through experimental, foaming agents and foam stability agent selecting and the the properties of resisting of salt and temperature and against the oil coming were introduced.And the mechanism was analysed in briefly.