By summarizing the composition,classification,and performance characterization of functional adhesive materials,the adhesion mechanisms of functional adhesive materials,such as adsorption/surface reaction,diffusion,me...By summarizing the composition,classification,and performance characterization of functional adhesive materials,the adhesion mechanisms of functional adhesive materials,such as adsorption/surface reaction,diffusion,mechanical interlocking,and electrostatic adsorption,are expounded.The research status of these materials in oil and gas drilling and production engineering field such as lost circulation prevention/control,wellbore stabilization,hydraulic fracturing,and profile control and water plugging,and their application challenges and prospects in oil and gas drilling and production are introduced comprehensively.According to the applications of functional adhesive materials in the field of oil and gas drilling and production at this stage,the key research directions of functional adhesive materials in the area of oil and gas drilling and production are proposed:(1)blending and modifying thermoplastic resins or designing curable thermoplastic resins to improve the bonding performance and pressure bearing capacity of adhesive lost circulation materials;(2)introducing low-cost adhesive groups and positive charge structures into polymers to reduce the cost of wellbore strengthening agents and improve their adhesion performance on the wellbore;(3)introducing thermally reversible covalent bond into thermosetting resin to prevent backflow of proppant and improve the compressive strength of adhesive proppant;(4)introducing thermally reversible covalent bonds into thermoplastic polymers to improve the temperature resistance,salt-resistance and water shutoff performance of adhesive water shutoff agents.展开更多
C30 coral aggregate concrete with chlorella control effect was prepared by adding nano-TiO_(2) and hydrophobic material,and the effects of nano-TiO_(2) and hydrophobic material on the basic properties of C30 coral agg...C30 coral aggregate concrete with chlorella control effect was prepared by adding nano-TiO_(2) and hydrophobic material,and the effects of nano-TiO_(2) and hydrophobic material on the basic properties of C30 coral aggregate concrete and chlorella control effect under different experimental conditions were compared.The experimental results show that nano-TiO_(2) and hydrophobic materials have a certain degree of influence on the basic properties of concrete,but the influence is not significant.Under long-term immersion,nano-TiO_(2) and hydrophobic materials can inhibit the growth of Chlorella vulgaris.The maximum fluorescence value of concrete is decreased by 53.6% after adding TiO_(2),and the maximum fluorescence value of concrete is prolonged by 20%(1 day).The maximum fluorescence value of concrete is decreased by 67.7% after adding hydrophobic materials,and the maximum fluorescence value of concrete is also prolonged by 20%(1 day);Under the condition of simulated tidal water,the inhibition effect of Nano-TiO_(2) on the growth degree and growth rate of Chlorella vulgaris is weakened,at this time the maximum fluorescence value of concrete mixed with nano-TiO_(2) is decreased by 50.5%,and the maximum fluorescence value is only prolonged by 14.3%;while the inhibition of hydrophobic materials on the growth degree and growth rate of Chlorella vulgaris is enhanced significantly,and the maximum fluorescence value of concrete with hydrophobic materials is decreased by 80.3%;the maximum fluorescence time is prolonged by 114.3%.展开更多
This paper set up a series of comprehensive targets based on the concept of＇anti-freeze filler＇, which include reasonable water retention rate, frost heave characteristics, and compaction characteristics of filling ...This paper set up a series of comprehensive targets based on the concept of＇anti-freeze filler＇, which include reasonable water retention rate, frost heave characteristics, and compaction characteristics of filling material. Then, a type of permeable graded gravel is proposed, suitable for high-speed railway subgrade. A series of in-door water retention, permeability, and frost heave tests were performed under different graded conditions. Water retention, permeability, and frost heave characteristic of dif- ferent graded filling materials can be determined, in order to define the gradation range of permeable graded gravel. Relying on the frost-heave monitoring record of high speed railway in Northeast China, a series of experimental studies were per- formed, which included on-site filler production, compaction test, and the anti-frost effect test, in order to improve the pro- duction and compaction techniques of permeable graded gravel. From the research of this paper, the use of permeable graded gravel subgrade as the anti-frost structure for the high-speed railway subgrade in cold areas is feasible.展开更多
基金Supported by National Natural Science Foundation of China(51991361,52074327)Major Engineering Technology Field Test Project of CNPC(2020F-45)。
文摘By summarizing the composition,classification,and performance characterization of functional adhesive materials,the adhesion mechanisms of functional adhesive materials,such as adsorption/surface reaction,diffusion,mechanical interlocking,and electrostatic adsorption,are expounded.The research status of these materials in oil and gas drilling and production engineering field such as lost circulation prevention/control,wellbore stabilization,hydraulic fracturing,and profile control and water plugging,and their application challenges and prospects in oil and gas drilling and production are introduced comprehensively.According to the applications of functional adhesive materials in the field of oil and gas drilling and production at this stage,the key research directions of functional adhesive materials in the area of oil and gas drilling and production are proposed:(1)blending and modifying thermoplastic resins or designing curable thermoplastic resins to improve the bonding performance and pressure bearing capacity of adhesive lost circulation materials;(2)introducing low-cost adhesive groups and positive charge structures into polymers to reduce the cost of wellbore strengthening agents and improve their adhesion performance on the wellbore;(3)introducing thermally reversible covalent bond into thermosetting resin to prevent backflow of proppant and improve the compressive strength of adhesive proppant;(4)introducing thermally reversible covalent bonds into thermoplastic polymers to improve the temperature resistance,salt-resistance and water shutoff performance of adhesive water shutoff agents.
基金Funded by the National Key R&D Program of China(No.2017YFB0309902)the Youth Fund of CABR Fund Project(No.20210122371030009)。
文摘C30 coral aggregate concrete with chlorella control effect was prepared by adding nano-TiO_(2) and hydrophobic material,and the effects of nano-TiO_(2) and hydrophobic material on the basic properties of C30 coral aggregate concrete and chlorella control effect under different experimental conditions were compared.The experimental results show that nano-TiO_(2) and hydrophobic materials have a certain degree of influence on the basic properties of concrete,but the influence is not significant.Under long-term immersion,nano-TiO_(2) and hydrophobic materials can inhibit the growth of Chlorella vulgaris.The maximum fluorescence value of concrete is decreased by 53.6% after adding TiO_(2),and the maximum fluorescence value of concrete is prolonged by 20%(1 day).The maximum fluorescence value of concrete is decreased by 67.7% after adding hydrophobic materials,and the maximum fluorescence value of concrete is also prolonged by 20%(1 day);Under the condition of simulated tidal water,the inhibition effect of Nano-TiO_(2) on the growth degree and growth rate of Chlorella vulgaris is weakened,at this time the maximum fluorescence value of concrete mixed with nano-TiO_(2) is decreased by 50.5%,and the maximum fluorescence value is only prolonged by 14.3%;while the inhibition of hydrophobic materials on the growth degree and growth rate of Chlorella vulgaris is enhanced significantly,and the maximum fluorescence value of concrete with hydrophobic materials is decreased by 80.3%;the maximum fluorescence time is prolonged by 114.3%.
基金supported by the China Railways Corporation research projects entitled"The technical tests for the high speed railway subgrade frost heave prevention in the alpine"(Project No.Z2013-038)The long term observation of frost-heave technology for Ha-Da high-speed railway during the operation(Project No.Z2012-062)+2 种基金Optimal design for high-speed railway subgrade structure under different grade and environment(Project No.2014G003-A)from the Railway Scientific and Technological Research and Development Center called"The mechanism and evolution rule of the graded gravel under freeze and thawing cycles for the high speed railway"(Project No.J2014G003)The disease control technology and equipment of gradating gravel in surface layer of subgrade bed(Project No.2013YJ032)
文摘This paper set up a series of comprehensive targets based on the concept of＇anti-freeze filler＇, which include reasonable water retention rate, frost heave characteristics, and compaction characteristics of filling material. Then, a type of permeable graded gravel is proposed, suitable for high-speed railway subgrade. A series of in-door water retention, permeability, and frost heave tests were performed under different graded conditions. Water retention, permeability, and frost heave characteristic of dif- ferent graded filling materials can be determined, in order to define the gradation range of permeable graded gravel. Relying on the frost-heave monitoring record of high speed railway in Northeast China, a series of experimental studies were per- formed, which included on-site filler production, compaction test, and the anti-frost effect test, in order to improve the pro- duction and compaction techniques of permeable graded gravel. From the research of this paper, the use of permeable graded gravel subgrade as the anti-frost structure for the high-speed railway subgrade in cold areas is feasible.
