PIPE ROCK钻柱扭摆系统应用评价

国外以斯伦贝谢公司Slider系统为代表的钻柱扭摆系统在常规滑动定向钻进时,取得了较好的减轻摩阻、克服钻进"托压"的应用效果,但国内钻柱扭摆系统仍处于试验与完善阶段。为此,从分析自主研发的PIPE ROCK钻柱扭摆系统的原理及系统构成、操作流程、使用方法、试验实钻结果等方面入手,结合与常规滑动钻进方式的技术效果比较结果,总结了该系统现场试验所取得的成果,分析了该系统的缺陷并提出了改进措施。研究结果表明:(1) L204井应用该系统前后的数据表明,扭摆钻井防托压效果明显;(2) Long016-H1井水平段共定向调整轨迹20次,使用常规滑动定向平均纯钻时效为64.3%,而使用钻柱扭摆系统的定向纯钻时效提高到83.4%,提升效果明显;(3)使用扭摆系统后,可以在钻进过程中不停钻调节定向工具面,使工具面保持长期稳定,提高了定向精准度;(4)钻柱扭摆系统目前还存在着自动化程度较低、需要人工实时调整扭矩设定值、使用效果受人员个体差异影响较大等缺点,因而有必要持续改进该系统以最终实现轨迹的智能控制。结论认为,该钻柱扭摆系统成功地解决了定向钻进托压难题,具有提高定向纯钻时效、提高定向精准度的作用,减少了定向次数和定向段长,大幅度提高了定向机械钻速和单趟钻的行程钻速,能够满足现场作业要求,具备工业化应用的条件。

Application evaluation of the PIPE ROCK twist drill string system

In foreign countries, the twist drill string systems with the Slider system of the Schlumberger Corp. as the representative present good performance during conventional sliding directional drilling, and they can reduce frictional resistance and conquer drilling back pressure. In China, however, such twist drill string systems are still in the stage of test and improvement. In this paper, the independently developed PIPE ROCK twist drill string system was analyzed from the aspects of principle, component, operation process, operation method and experimental result. Then, its technical effectiveness was compared with that of conventional sliding drilling method, and its on-site test results were summarized. Finally, its defects were analyzed and corresponding improvement measures were put forward. And the following research results were obtained. First, the data before and after its application in Well L204 shows that this twist drill string system is remarkable in back pressure prevention. Second, directional track adjustment is totally carried out in the horizontal section of Well Long016-H1 by 20 times. The average net drilling time efficiency of conventional sliding directional drilling system is 64.3% and that of twist drill string system is up to 83.4%, indicating a remarkable improvement of net directional drilling time efficiency. Third, when the torsion pendulum system is adopted, its orienting tool face can be regulated in the process of drilling, so that the tool face can be kept stable for a long time, and orienting accuracy can be improved. Fourth, the twist drill string system shall be improved continuously to develop the intelligent twist drill string system with the function of intelligent track control, for it is currently less automatic, its set value of torque must be regulated artificially in real time, and its application effect is more affected by different operators. In conclusion, the PIPE ROCK twist drill string system can satisfy the requirements of on-site operation, for it successfully solves the back pressure problem in directional drilling, improves net directional drilling time efficiency and orienting accuracy, reduces orienting frequency, shortens the length of direction section and increases the directional rate of penetration and single-trip drilling velocity. Therefore, it is capable of being applied industrially.