Experimental Study On Visbreaking Of Heavy Crude Oil In Formations By Hydrothermal Catalytic Cracking During Steam Stimulation

The quantity of thick oil reserves in the world exceeds 6 trillion gallons. The thick oil will become primary energies in the 21st century along with the decrease of recoverable conventional petroleum reserves. Shengli oil field has rich thick oil reserves. The known petroleum reserves are 27.6 billion tons, the producing reserves are 2.54 and the recoverable reserves are 0.24 hundred million tons. The superior thick oil reservoir and the special thick oil reservoir account for the entire thick oil producing reserves above 60%, at present the recovery percent of reserves is only 13.5%. After many year developments, the thick oil development is facing a series of questions and huge difficult, mainly has following several aspects: 1st, drowning in the main oil field is serious, the water bearing ratio of Le An and Shan Jiasi oil field all surpassed 90%; 2nd, in later period of steam stimulation, because of the huge energy of edge water, the effective step development way implements with difficulty; 3rd, new high quality replaceable resources are few, the superior thick oil, in-depth thick oil and the sensitive thick oil reservoir is common..Developing the new development technology becomes an. important premise of enhancing the thick oil reservoir production effect. At present the usual thick oil production way could not meet the thick oil development need in Shengli oil field, which need to explore the new way of the thick oil development. In the process of thick oil processing in refinery, the hot catalytic cracking craft is used to enhance the light oil recovery. Whether realizes cracking reaction of the thick oil under the formation condition, "the refinery moves to underground", then is a brand-new way which selects water thermal cracking catalyst to inject into the formation, and produce the cracking reaction under the formation condition, thus achieves the goal of reducing the thick oil viscosity and enhancing development effect.Through the molecular chemistry angle, according to the question actually asked in the mine and through the laboratory experiment research, this article mainly explains the catalytic cracking reaction mechanism of the thick oil under the formation condition under, screens the catalyst system in the low temperature as well as under the formation fluid and the environmental condition, and studies the effective application method of the catalyst. And expected through the deep research, under the grasping formation condition restricts thick oil mining the primary factor, and seeks the science effective solution. Mainly studied 1st, establishing the thick oil catalysis fallen sticks evaluated flow and the experimental technique under the oil reservoir condition. Mainly establishes and consummates the dynamic research and the assessment method of implementing the reduced viscosity technique in the thick oil thermal energy mining process. 2nd, a new technical feasibility experimental study of falling viscosity to produce the thick oil by the formation water hot catalytic cracking. To research and develop the low lukewarm water thermal cracking catalyst system suiting for ultra thick oil reservoir production; To research the thick oil main characteristic suiting for the underground catalysis to reduce viscosity producing, and to optimize the use engineering factor and the effective application method of the selected catalyst. 3rd, the compatibility of catalyst and formation compatibility and the response characteristic of catalyst underground, like catalytic activity change and term of validity appraisal.4th, to explain the thick oil catalytic cracking reaction mechanism under the formation condition.This project mainly aims at the thick oil of Shan6 east areas to study the catalyzing, cracking and falling viscosity, which already screened the reasonable catalyst system and the exploitation conditions, and has designed the field implementation plan. Because this project is the forward-looking foundation experimental study project which established the thick oil catalysis to fall viscosity evaluating flow and evaluating method of screening the catalyst system under the oil reservoir condition, which had the very big promoted value, and can promote the use in the similar oil reservoir.