摘要：在钻井过程中，井斜是一个普遍存在的问题，它直接关系到井身质量和钻井速度。几十年来，人们在这一领域的努力取得了很大进展，钻井防斜技术水平得到很大的提高。但就目前的发展情况来看，井斜问题尚未在根本上得到解决。钻井防斜技术尚未取得质的突破，因此，在提高机械钻速的同时，怎么能够有效的控制井斜是钻井工作者长期以来非常关注的问题。PDC钻头是20世纪80年代研制出的以聚晶金刚石复合片为切削齿。PDC钻头具有在小钻压下能获得较高钻速的特点，这样就使得其具有在单位时间内较高进尺的特点，能过减小钻井成本。这就使得PDC钻头在钻井工程中得到广泛的应用。运用ADINA软件分析钻头破岩过程，进而分析钻头受力。在钻井实践过程中，通过研究人员地不断努力，在总结各种防斜钻具组合的基础上，单弯螺杆钻具由于自身结构的特点，单弯螺杆钻具控制井斜的原理是从钻具本身考虑如何来增大钻头的侧向力。使其与传统的防斜钻具相比不仅具有更为显著控制井斜的效果，而且利用单弯螺杆钻具和PDC钻头的钻具组合结构进行井斜控制，能够在低钻压、高钻速条件下有效地控制井斜。单弯螺杆钻具与普通钻具相比，在单位进尺相同条件下，PDC钻头切削下井壁的次数能高出2-4倍。因此，单弯螺杆钻具组合有较强的井斜控制能力。

关键词：单弯螺杆；PDC钻头；井斜控制；ADINA软件

Abstract：During the drilling, well deviation is a common problem, it is directly related to the quality of the well bore and the speed of drilling． For decades, efforts of the people in this area has made great progress ,the technical level  in drilling deviation control  has been greatly improved． But the current development situation, the well deflection has not been fundamentally resolved． Drilling deviation control technology is not yet made ​​a qualitative breakthrough, Although, in the same time improve penetration rate , the drilling workers has long been of great concern on how to effectively control the well deviation ． PDC bit is developed in the 1980s, which cutter is the polycrystalline diamond compact , the PDC bits can get the higher rate of penetration with small drill pressure ． that makes its higher unit time drilling footage ,which can reduce the cost of drilling． This makes the PDC bit has been widely used in drilling engineering． Using the ADINA software analyzes the process of bit rock．Analyze the force of the bit. In the process of drilling practice, though the efforts of the researchers continue efforts on the basis of summing up all kinds of anti-deflection BHA, the single bend screw drill due to the characteristics of their own structure, the principle of single curved screw drill to control the well deviation is how to increase the lateral force of the drill bit from the drill itself． Compared with the traditional anti-oblique drill , the single bend screw drill has the more significant the effect of control hole deviation, and the structure use of single-bend screw drill and PDC drill bit  ,can get good effect under the conditions of a low pressure, high drilling rate ．compared with the ordinary drill ,the single bend screw drill can get 2-4 times higher the number of  PDC bit cutting the sidewall． Therefore, the single bending screw has the strong deviation control capabilities．

Key words: single bend screw； PDC bit ；deviation control；ADINA  software．