The offshore platform without workover rig relies on drilling vessel for workover,which is costly and slow in efficiency,moreover,the existing unconventional operation technologies have high requirements for platform conditions and are difficult to promote.Therefore,research and application were carried out for coiled composite cable dropping-fishing artificial lift technology.Aiming at the complex well conditions and the character-istics of platform without workover rig,the string and downhole tool structures were optimally designed;by means of cable selection calculation and electric pump head fitting,a pilot application was carried out in the A21H1 well of the WZ11-1A platform in western South China Sea.The research results show that the coiled composite cable dropping-fishing artificial lift technology optimizes string structure,cancels wet connector design,adds hydraulic control sliding sleeve,and can achieve layer change during production.The coiled composite cable integrated with special power cables has greater strength and enhanced anti-corrosion ability,greatly reducing operational risks.Snubbing operation has been accomplished in A21H1 well,which has a daily incremental oil of 60 m3 for the mo-ment.The research conclusions provide technical support for workover operation in offshore oilfield platforms with-out workover rigs.
coiled composite cableelectric pump liftingsupporting toolsplatform without workover rigfield application
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