| Oilfield development has entered medium and late stage,formation reserves less and less.Oil production develop to the depth direction,becoming more and more perfect,workover more and more difficult,the improvement of technology makes up for the decline of the geological exploration reserves,corresponding to the safety of workover equipment become more sophisticated.Oil workover operations objective is put wellbore tubular column drill pipe,tubing,sucker rods in or out the hole through petroleum workover derrick,meet the implementation of workover measures for overhaul and a series of other supporting scheme?At present,the status of oil workover operation is through workover dial transfer the workover equipment rotary power to wellbore string rotation,meet wellbore casing drilling sand,milling fish top,washover annulus,cut tubing casing,deep sidetracking and so on.If workover equipment group is self-propelled wheeled chassis workover rig,diesel powered kinetic energy through the shaft transfer to the tank with pump,the power sent to the chassis walking and part of stage power input;After continuously variable torque converter to power continue to enter the angle gear box,The bevel gear in angle drive transmits the power to winch,Winch passes power through winch clutch to the winch drum,the drum transmits power to the big hook by rope,crane sheaves,traveling block.Hook suspension elevators transmits power to the wellbore within the column,in order to achieve a vertical reciprocating motion,then a single unloading single.The other way power of workover angle gear box is transmitted to the wellhead turntable through the chain box,turntable drive kelly rotation,kelly led the wellbore string rotation,and realize the purpose of drilling,plugging,milling,cutting in shaft.The swivel of workover equipment realized wellbore fluid flow within the shaft,and then it realizes the purpose of drilling,plugging,milling,cutting in shaft.Workover equipment of auxiliary equipment of the blowout preventer components ensures that the opening and closing in the gas-liquid wellbore,ensures the safe and reliable of workover operation.Cement truck,tanker,wellsite waste oil pools with workover string up and down movement,to achieve a continuous loop workover,Complete workover process tool,the tool into the well of the well completion purposes,but also to achieve the maintenance of wells pump inspection for-packers,workover and other measures for large complex workover program implementation.Oilfield commonly uses self-propelled wheeled workover rigs.Well machine mainly consists derrick,chassis platform(including tank with pump,hydraulic torque converter,Angle gearbox,winch,the brake,the driller's console,small hydraulic winch,a transmission axis,a chain box,etc),crown block and travelling block,hook,tube rod elevator,sealing well blowout preventer,turntable,etc.Transmit power from the diesel engine to the wellbore column,intermediaries link chain is longer,the distribution of multi-source security hazard risk is more,analysis of safety factors from the perspective of security,HSE requires four main factors: human,machine,rings,tubes.For workover equipment increasingly perfect machine to do a comprehensive in-depth analysis,list the workover rig dangerous point,analysis the harm degree,belongs to the level of risk is higher for the classification of the main hazard factor and major hazard factor,From a security point of view make safety assessment on the current oilfield engineering workover equipment,Propose corrective measures and the specific implementation of the measures and recommendations,The development of workover along with new technology,Wellhead hydraulic jacks supporting card technology solution,workover string combinatorial optimization tools within the wellbore,Dynamic monitoring and control of workover equipment is becoming mature.Through a series of methods and measures to minimize the risk of workover process,ensure workover equipment workover operations run more reasonable and scientific. |
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