Optimization Of Insulation Material And Structure In Steam Pipeline

Steam stimulation and steam flooding of thermal recovery method are main technologiesfor heavy crude oil recovery enhancement. Different degrees of heat loss of steam systemexists in all aspects of production and operation. In this paper, spot checks Liaohe Oilfield48,23km of the ground steam pipeline, the ground steam pipelines average heat loss is298.0W/m2which is1.58times of the national standard of the allowable maximum heat lossas188W/m2, reduced waste cost of6320000yuan that seriously affect steam stimulation andthermal recovery economic benefits. Research on efficient thermal insulation material andstructure, to maintain the pipeline temperature of the steam and dry degree which can greatlyimprove the heavy oil thermal recovery effect and improve economic benefits.In this paper, the steam pipeline of existing insulation materials and conventionalinsulating structure were studied, and developed a new type of gelling insulation materials,proposed the active heat preservation structure of the steam pipeline, establishment of pipeinsulation structure optimization mathematics model, developped the effective thermalinsulation materials and structures. Mainly in the following6aspects of work：1.Analyse and evaluate steam pipelines insulation condition, find out the weak links ofinsulation and existing problems, in order to reduce the steam delivery and injection of energyloss in the process, improve the well dry steam, implement the energy-saving technologicaltransformation, provide the basis and technical support. According to the workingcharacteristics and requirements of steam injection pipeline, recommend use insulationmaterial with excellent thermal insulation properties as the ground steam pipeline ofinsulation materials，and by adopting the composite insulation structure, minimize the heatloss of steam pipelines.2. So far the main disadvantage of thermal insulation material is strong water absorption,low intensity. In the view of this situation, this paper developed a thermal insulation materialfor the strong hydrophobic nature, high strength. This material is a high iron and aluminumlow calcium solid powder. Under the action of activator, it can react with water and form acured. This cured under repeated impact of the high temperature of420℃no cracks, nocracking, strength and insulation performance is not decreasing. In order to improve thethermal insulation property of this material, mixed pore increasing agent in the ingredients,make curing and form a porous structure in the internal at the same time, also can realize thematerial density of control. 3. Aiming at the thermal insulation material commonly used in steam pipeline and newgelling insulation material and aerogel materials, conducted the indoor test experiment ofthermal properties, mechanical properties, the microscopic characteristic evaluation, selectedthe high-quality thermal insulation material.4. Evaluated the stability and thermal insulation for insulation structure, considered theeffect of binder on the insulation layer and the outer protective layer materials of mechanicalanalysis. Optimized the structure stability，heat flux density low, good insulation effect of thethermal insulation structure.5. In order to improve the temperature of pipeline outer wall, reduce the temperaturedifference between inside and outside, so as to reduce the heat loss. Establishment of activeheat preservation structure model, using FLUENT software simulate of environmental factors,different insulation materials, the outside temperature, interlayer thickness and the type ofmedium in interlayer, to study the impact of various factors on the new active heatperservation effect.6. According to the optimization mathematical model of steam pipeline insulationstructure, thermal insulation pipeline optimization design was developed by managementsoftware. Developed the pipeline optimization insulation design operation managementsoftware, the software can be used for the selection of insulation material, the thickness of theinsulation layer optimization, provided the feasible options for steam pipeline insulationconstruction.