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近来,钻井界的大位移井数量剧增,尤其在俄罗斯萨哈林1号项目施工中创造出了11282m的全球记录。其他的超长大位移井包括英国WytchFarm油田的M-16井,总测量井深11278m(位移10728m);阿根廷的CN-1井,总测量井深11184m(位移10585m);北海的Visund的一口井,总测量井深9082m,等等。钻这些大位移井具有相当的难度和挑战性,这已经超出了常规钻井技术的极限。最为严峻的挑战是钻柱质量的增加,钻柱质量增加将导致摩阻增加相当严重。在超长井眼中,随着井深的增加,摩阻会迅速增大,此时如果不采取降摩或者减少钻柱与井壁接触面上的重力分力,钻进就可能难以为继。因此,减少钻柱质量对大位移井施工是非常有利的。增加水平井钻进极限的办法之一是用较轻的合金钻杆代替常规钢钻杆(SDP)。这种钻杆性能良好,优势显著,最大的益处是可以减少水平井段的摩阻和扭矩,从而降低发生弯曲的可能性。铝钻杆(ADP)具有钻各类井的现场应用经历,其最杰出的成就是1990年在Kola创下的超深井世界记录。该井由井下马达和钻柱通过复合钻进方式完成,钻柱主要由铝钻杆组成。该井的施工积累了大量的铝钻杆应用经验,在后续相对简单井的施工中得到了有效的应用。事实上,至上世纪80年代铝钻杆的使用数量已经占到前苏联当时在用钻杆的80%。
Recently, the number of large-displacement wells in the drilling industry has increased dramatically, in particular, a global record of 11282m has been created during the construction of Sakhalin-1 in Russia. Other extra long displacement wells include the M-16 well of the WytchFarm field in the United Kingdom, with a total measured well depth of 11278 m (displacement of 10728 m); CN-1 well of Argentina with a total measured well depth of 11184 m (displacement of 10585 m); a well of Visund in the North Sea, Measuring well depth of 9082m, and so on. Drilling these large displacement wells is quite difficult and challenging, which is beyond the limits of conventional drilling technology. The most serious challenge is the increase in the quality of the drill string, the increase in the quality of the drill string will lead to a considerable increase in friction. In ultra-long wellbores, as the well depth increases, the friction increases rapidly, and drilling can be unsustainable without taking down the friction or reducing the gravitational component at the contact surface between the drill string and the wellbore. Therefore, reducing the quality of the drill string is very beneficial for the construction of large-displacement wells. One way to increase the horizontal well drilling limit is to replace the conventional steel drill pipe (SDP) with lighter alloy drill pipe. This type of drill rod performs well with significant advantages, with the greatest benefit of reducing friction and torque in the horizontal section and reducing the likelihood of buckling. Aluminum Drill Pipe (ADP) has the field experience of drilling various wells and its most distinguished achievement is the world record for ultra-deep wells set at Kola in 1990. The well by the underground motor and drill string through the composite drilling completed, the drill string is mainly composed of aluminum drill pipe. The well construction has accumulated a great deal of experience in the application of aluminum drill pipe, and has been effectively applied in the subsequent relatively simple well construction. In fact, the amount of aluminum drill pipe used in the 1980s accounted for 80% of the drill pipe currently used in the former Soviet Union.