For Deep Profile Of The New Micro-sol Synthesis, Characterization And Performance Evaluation

Most oilfield in our country are non-homogeneous reservoir. For non-homogeneous field, it is significant for enhanced ultimate recovery to adjust the water injection profile of the reservoir, to increase water intake capacity of low permeability layer, to expand the coverage of water flood, to improve effect of water flooding and to enhance oil production。Through literature review we found that pore throat diameter of Reservoir rocks in reservoir is generally in the micron level after water flooding for a long time. Micron-level profile control agent can protect the low permeability reservoir effectively and continue to block, deformation, migration in the reservoir rock pore throats so that it can change filtration direction of the fluid and achieve.deep profile control effect.In this thesis, we mainly develop a new micron-grade micro sol particles and study the micro-sol particles'optimization and performance evaluation. Research content and the 'results are as follows:(1)Through extensive literature research, we selected the method to synthesis programs and micro-sol particles are synthesized by using inverse emulsion.then,we characterize the basic property of micro-sol particles.Experimental results show that:micro-sol particles is high solid content, well round sphere, large number of micron particle size, dispersion and other characteristics;(2) Using the orthogonal experimental design to determine the approximate scope of the various factors in the reaction carried out. We analyze the various factors on the polymerization conversion rate. The optimization of the polymerization process conditions is as follows:the initiator choose water-soluble azo initiator of 0.13%, monomer concentration of 34%, oil ratio 1.75:1,system HLB value:5.3, emulsifierconcentration of 10.5%,Stable crosslinking agent JQ of 0.12%, polymerization reaction temperature is 52℃, Respond Time is 6h;(3) Using single-factor method to study the influence on the particle diameter. The factors are mainly the amount of emulsifier, stirring speed, oil/water ratio, initiator concentration and polymerization temperature. Experimental results show that:with stirring speed, oil-water ratio, initiator concentration, polymerization temperature increasing, the particle diameters decrease. The influence of emulsifier added amount on particle diameter is larger than other factors;(4) Through micro-sol particles'swelling performance evaluation we found that micro-sol particles has well water swelling properties in the condition of 25-55℃,0-20000mg/L salinity. The maximum expansion is up to 6.13 times. We use the breakthrough pressure to evaluate the strength and toughness of micro-sol particles. Micro-sol particles synthesized have high strength in the conditions of 25-55℃,0-20000mg/L salinity. The maximum pressure is up to 43kpa.Through physical simulation of micro-flow experiments with the artificial core, experimental results show that micro-sol particles have some deep fluid shift effect to the artificial core pore.