| At present,carbon fiber reinforced resin matrix composites are seldom used in oil production equipment,mainly because of the complex working environment in the oil field and the difficulty of using resin matrix in composite materials.Especially in the field of high temperature oil production,with the increase of the depth of oil wells and the exploitation of some heavy oil wells,the temperature of downhole oil production increases continuously and the corrosiveness is stronger.Therefore,it is necessary to study carbon fiber composite resin matrix in order to improve the temperature resistance,corrosion resistance and mechanical properties of the composites for oil production equipment under high temperature environment.Poly(phthalazinone ether)resin can be used as toughening modifier for multi-functional epoxy resins,as its high temperature resistance and solubility,as well as its high glass transition temperature in the range of 250?-310?.The high temperature epoxy resin modified by poly(phthalazinone ary ether)was used in pultrusion process,which not only maintained the temperature resistance of pultrusion products,but also improved their toughness,impact resistance and stress cracking resistance.At the same time,carbon fiber reinforced poly(phthalazinone ether)resin is used to manufacture sucker rod centralizer to improve its high temperature wear resistance,which can solve the problem of short service life of metal centralizer used in high temperature deep wells and heavy oil wells due to its non-corrosion resistance.Therefore,this work mainly explores the use of carbon fiber as reinforcement,modified epoxy resin and poly(phthalazinone ary ether)resin as matrix,employ continuous pultrusion process and extrusion process to produce carbon fiber composite sucker rod,high temperature resistance and high wear resistance centralizer respectively,and evaluate the application effect.In addition,a new type of high temperature resistant and high shear polymer adhesive was synthesized and used to finish the bonding process between carbon fiber composite and metal material.This work mainly consists of the following four parts.Poly(phthalazinone ether nitrile sulfone ketone)s terminated with amine(A-PPENSK)and epoxy(E-PPENSK)were synthesized by solution polycondensation reaction based on 1,2-Dihydro-4-(4-hydroxyphenyl)-1-(2H)-phthalazinone(DHPZ),2,6-difluorobenzonitrile(DFBN),di-p-fluorophenylketone(DFK)and 4,4'-dichlorodiphenyl sulfone(DCS),repectively.Adhesives with high glass transition temperature and excellent shear strength were prepared by blending different molecular weight polymers.The shear strength at room temperature was 48.7 MPa,and the shear strength at 350 ? and 400 ? was well maintained,and the value was 30.2MPa and 24.6MPa,respectively.The tensile strength of carbon fibre composite rod and metal joint bonded with this adhesive was greater than 300kN,and the strength retention rate reacheed 90%after millions of fatigue tests.Carbon fiber reinforced poly(phthalazinone ether sulfone ketone)(PPESK)with high temperature resistance and high performance was studied.It was mainly used as oil field centralizer by extrusion and injection moulding.The effects of carbon fiber content on mechanical properties and processing properties of the CF/PPESK/PPBESK system were systematically studied.When carbon fiber content was 25%,the mechanical properties of the centralizer obtained were the highest,the friction coefficient was the lowest,and the wear rate was lower than that of the metal centralizer.The properties of the products are as follows:tensile strength?150MPa,flexural strength>280MPa,thennal deformation temperature>270?,friction coefficient<0.045.The practical application of carbon fiber reinforced PPESK/PPBESK matrix composite centralizer in oil field showed that the centralizer can be used for more than 500 days at 260 ?.The effect of centralized protection is obvious.The average service life of the centralizer is twice as long as that of the metal material centralizer.It can replace the metal centralizer currently used in oil field and serve in high temperature heavy oil wells in oil field.The multi-functional epoxy resin was modified by poly(phthalazinone ether sulfone ketone)(PPESK).The curing behavior,compatibility,viscosity change and related mechanical properties of the blend resin were studied.CF/PPESK/modified multi-functional epoxy resin composites were prepared with carbon fiber(CF)as reinforcement.The feasibility of PPESK modified multi-functional epoxy resin used in carbon fiber extrusion process was discussed from the aspects of mechanical properties,torsional strength,fatigue properties and aging properties.The heat resistance of the blends was improved by toughening epoxy resin with PPESK.With the increase of PPESK content,the glass transition temperature of the blends could be increased by about 5?.When the content of PPESK in the system was 4%-6%,the change of tensile strength and elongation at break of the blend resin was small,the bonding force of the two materials was good,and the stability of the blend viscosity met the requirements of the pultrusion process.The bending radius of composite bar modified by PPESK met 55D requirement,and the surface layer did not crack or peel.After 1 million fatigue cycles,the frequency of fatigue sinusoidal wavefonn did not change,and the strength retention rate of the material was more than 90%.After aging test,the strength retention rate was more than 90%.The manufacturing technology of carbon fiber reinforced resin-based sucker rod was studied.The properties of the product were as follows:tensile strength>1580MPa,interlaminar shear strength>69MPa,joint yield strength>590MPa,glass transition temperature ?195 ?.Through theoretical and practical well condition analysis,the operation technology and standard flow of carbon fiber sucker rod connection were determined,and the reference method of carbon fiber sucker/steel sucker rod string combination layout design was formed.By optimizing the rod-string combination design,the efficiency of the pumping system was increased by 12.2%on average,and the power consumption per ton of liquid was decreased by 12.5 kW h/t on average. |
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