At present open-hole horizontal wells in loose sandstone oil reservoirs adopt sand control string with hanging screen to carry out sand control well completion. Therefore, problems such as sand burial, blocking and rapid decrease in production occur in fine sandstone reservoir, siltstone reservoir and highly muddy reservoirs. To solve the problems the integrated string of choke flow, acid washing and filling for open-hole horizontal well was developed. The string mainly consists of choke sealing device, pressure control mechanism, bottom filling external device , positioning mechanism and internal filling device. The rational combination of pressure control mechanism and choke sealing device ensures the safety and reliability of mud cake removal and gravel filling. The drift diameter of filling equivalent reaches 65 mm, thus satisfying the requirement of gravel filling operation whose displacement is as high as 3 m /min. The design of the composite seal structure of external and internal filling heads ensures the sealing and bearing capacities of the string. The laboratory test and field application show that the string integrates mud cake removal and gravel filling with a reliable comprehensive performance, very desirably satisfying the requirement of scouring, filling and sand control in open-hole horizontal well.%针对目前疏松砂岩油藏裸眼水平井采用悬挂滤砂管的防砂管柱进行防砂完井,在细砂岩、粉细砂岩油藏以及高泥质等油藏中易造成砂埋、堵塞、产量下降快等难题,研制开发了裸眼水平井阻流酸洗充填一体化管柱.该管柱主要由阻流密封装置、压力控制机构、底部充填外装置、定位机构和内充填装置等组成.压力控制机构与阻流密封装置的有机结合确保了泥饼清除和砾石充填的安全可靠性；充填内通径达65 mm,可满足排量高达3 m3/min砾石充填施工的需要；内、外充填口复合密封结构设计保证了管柱的密封和承压能力.室内试验和现场应用结果表明,该管柱集泥饼清除和砾石充填于一体,综合性能可靠,很好地满足了裸眼水平井酸洗充填防砂的要求.
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