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针对传统的单动双管取心器存在的内外管同心度差、轴承容易损坏、没有滤浆沉砂装置、双管间隙容易堵塞、取心效率低等问题,研制出DJ型单动双管取心器。该取心器主要由滤浆沉砂装置、密封单动装置、内管(半合管)调节组件和卡心装置组成,具有同心度高、密封性好、滤液及水路设计合理、取心管长度大、可减少钻进回次、提高取心效率等特点。现场应用表明:该取心器取心效果好,使用寿命是传统取心器的2倍以上。
Aiming at the problems that traditional concentric single-action double-pipe revolver has poor concentricity of inner and outer pipe, bearing is easy to damage, no filter settling device, two-pipe gap is easy to block, coring efficiency is low and so on. Take heart device. The centering device is mainly composed of a filter sand setting device, a sealing single action device, an inner tube (semi-tube) regulating component and a card center device, which has the advantages of high concentricity, good sealing, reasonable filtrate and waterway design, Length, can reduce drilling times, improve the efficiency of coring and so on. The field application shows that the coring device has a good coring effect and the service life is more than twice that of a traditional coring device.