Study On Dumping Technology Of Heavy Oil In Hong 003 Well Area Of ​​Xinjiang Oilfield

Heavy oil resources mark means of great significance to mitigate deficient crude oil in the future. Therefore, heavy oil is accounting for an increasing proportion in oilfield development, and severe adhesion of heavy oil of high viscosity in tube walls poses extreme difficulty to the production and transportation of heavy oil. Thin oil, heat tracing or watering are frequently applied in the transportation of heavy oil. Application of thin oil is restricted due to its scarcity, expensive supporting facilities, and the influence on refining of subsequent oil products. Heat tracing can be utilized only in transportation of short distance. However, watering transportation has attracted increasing attentions in recent years with good economic and social benefits.The gathering and transportation process featuring gathering and transportation process is mainly put into application in red well block003of Xinjiang Oil Field. Heat tracing process can generate high energy consumption, therefore, the project, which, by making use of the feature of phase inversion point of heavy oil, takes two types of oil samples in red well block003as the object of study and focuses on flow characteristic, emulsification degree as well as variation rules of micro-morphology of oil-water liquid, which consists of heavy oil and produced water, employs experiment research approach featuring combination of rheological testing technology, image analysis techniques, and circuit simulation technology, tests and analyzes phase inversion point or emulsification degree, mixed transportation flow pattern, pressure drop (or differential pressure) rules of oil-water liquid, and then determines the optimal watering volume and temperature, thus proposing the gathering and transportation plan of oil mixed with water for red well block003, and demonstrating economic evaluation. Work of the following aspects is mainly carried out in the paper:(1) Test viscosity of oil-water liquid with high water content through circuit experiment: under varied temperatures and flows etc., determine differential pressure of unit pipe range of oil-water liquid in red well block003, perform inverse computation on heavy oil pipe flow viscosity based on current oil-water flow pattern, and draw pipe flow viscosity-temperature characteristic curve;(2) Determine phase inversion point of heavy oil with water as well as optimal watering volume of single well according to pipe flow viscosity-temperature characteristic curve through combining analysis on macro and micro features of emulsified oil;(3) Study low temperature fluidity of oil-water fluid and determine optimal watering temperature through low temperature fluidity simulation experiment with high water content;(4) Through combining actual condition of the field, design gathering and transportation plan of heavy oil with water based on optimal watering volume and temperature determined in the experiment;(5) Calculate energy consumption of transportation with water for single well by combining subsequent processing of crude oil, and compare with energy consumption of steam tracing. Conduct comprehensive evaluation on watering process from technical and economic angles.The research results indicate that homogeneous flow pressure drop pattern can be applied to perform inverse calculation on pipe flow viscosity of oil-water liquids in red well block003; optimal watering content of transportation with water is60%, and the watering temperature for single well is supposed to be higher than60℃; watering amount in field test is consistent with data of indoor experiment, water content of single well is between50%-65%after watering operation, pressure ratio of well head is lower than that of steam tracing, which is technically feasible; Transportation with water is conducted on336wells in the area with the investment of22,710,800Yuan; Compared with steam tracing, implementation of the project can save439.85×104m3/a natural gas and5.88×104m3/a water, emission of0.92×104t CO2can be reduced, annually reduced expenses will be931×104Yuan, and net present value will be3177.17×104Yuan; payoff period for dynamic and static investment is3.23and2.56years respectively, which demonstrates remarkable energy-saving benefit and is economically feasible.