The material used in the experiment was medium carbon steel, whose composition and mechanical properties are given in Table 1 and Table 2. The sample was designed to be a standard sample for the fatigue experiment, as shown in Figure 1, with a small concave in the middle to simulate the stress concentration area. Three-point bend fatigue tests were carried out on an Instron 1603 ElectroMagnetic Resonator (100 kN, 50-250 Hz), with bend load Faverage = 18 kN, Famplitude = 9 kN under a frequency of 130 Hz. A micro-magnetic measurement system, shown in Figure 2 (19) , was used to test magnetic fields perpendicular to the surface of a three-point bend specimen along the paths which have been indicated as the orchid lines in Figure 1 (line 7: Symmetrical position of line 1) with a liftoff of 2 mm during the fatigue experiments. The magnetic sensor, controlled by a three-dimensional scanning system, has a measuring range from 200 mGs to 6 Gs. Unless specified differently, the surface magnetic field in this paper means magnetic field perpendicular to the surface of the sample.
With the increase of inclination and friction in the process of drilling deep wells or highly deviated wells, the horizontal component of the gravity of drilling strings decreases continuously, causing difficulty in applying weight on bit and slow penetration, which cannot meet the urgent demand of improving the quality and efficiency of drilling. Therefore, a single-stroke two-stage hydraulic thruster has been proposed, which changes the traditional way of applying WOB by pushing the piston rod down by differential pressure between the annulus and the tool tube. The performance parameters of the tool have been obtained through the ground test, the sealing performance and structural strength are reliable, and the stretching motion is stable. The field application of hydraulic thruster has been carried out in well Tao-2-4-18A, and the results showed that the drilling rate increased by about 50% compared with that of adjacent wells in both the Zhifang formation and the Heshanggou formation. In addition, the flexible pressurized propulsion function of this tool could effectively protect the bit and reduce times of trips.
When the PDC drill bit encounters the heterogeneous and highly abrasive formation, it comes up with problems such as serious stick-slip phenomenon, shallow depth of penetration and short service life, and meanwhile, the rapid drilling tool with a single impact function cannot meet the drilling acceleration demand of exploration and development in deeper and more complex formation. Therefore, as a complementary implement of the traditional percussion drilling tools, a efficient drilling composite impactor has been designed, which is capable of applying both the reciprocating torsional impact and the reciprocating axial impact. The impact characteristic parameters of the tool have been obtained through the ground performance test, which also verifying the reliability of the composite impact timing, in addition, the field application has been carried out in Tian17-Xie12 well. And the results show that the key drilling parameters, such as well inclination and azimuth, change stably, thus shortening the sliding drilling time, and compared with adjacent wells, the tool above-mentioned has improved the mechanical drilling rate by 38%.
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