膨脹波紋管封隔定向井段應(yīng)用技術(shù)研究
[Abstract]:As an effective means to deal with underground complex conditions, expansive bellows technology has unique advantages in solving serious formation leakage, easy collapse and easy shrinkage, and has achieved good results in the application of straight well section. However, due to the influence of hole conditions in directional well section, the success rate of application needs to be further improved. In this paper, on the basis of independent research and development of four types of expansion bellows in the early stage, taking the actual demand on the spot as the starting point, the method of combining theoretical analysis, simulation calculation and laboratory test is adopted. The feasibility of sealing the complex formation of directional well section with expansive bellows is analyzed in detail. The end shaping and weld quality detection and evaluation methods are formed to improve the weld performance, and the spiral pipe expander and directional hole while drilling bit are developed to improve the field construction efficiency and reliability. In order to determine the applicability of expansive bellows in directional well section, the finite element simulation analysis method is used to establish the pipe string and wellbore model, and to simulate and analyze the wellbore conditions such as different well diameter, well inclination angle change rate and azimuth change rate. The variation of the outer diameter, maximum equivalent stress and maximum equivalent plastic strain of expansive bellows with expansion pressure. According to the analysis results, the expansion test of pipe string in curved wellbore is simulated in laboratory, which provides a reference for understanding the expansion state of expansion bellows in underground. In order to solve the problem of poor consistency of the end shape of the expanded bellows, a three-flap wedged shaping device has been developed, which can reduce the number of wrong edges between the ends from 4mm~5mm to less than 1mm, and improve the stability of the weld. In view of the lack of weld detection methods and performance evaluation standards, digital X-ray plate imaging technology is introduced, combined with processing software, the type, size and position of defects can be accurately identified, and the detection accuracy can reach 0.01 mm. By using the method of ABAQUS software analysis and laboratory test, the critical failure dimensions of porosity, unwelded penetration and crack defects under 30MPa expansion pressure are obtained, which provides the basis for the quality inspection of welds. In order to solve the problems of low strength and unsatisfactory expansion efficiency and effect of small size tube expander, a spiral tube expander is designed, which adopts integrated structure and has the characteristics of low friction and high wear resistance, so it can better deal with the underground complexity. In view of the present situation that the expanded bellows need to be expanded after drilling, a directional reaming bit while drilling is developed. In the process of directional drilling, the well diameter can be extended to the design requirements, and the time to deal with complex situations can be effectively saved. The research results of this paper have been successfully applied in the collapsible formation of the directional section of Daniudi gas field. Among them, the domestic expansive bellows technology has been successfully applied in the directional well section for the first time in PG22 well, and the length of the sealing section is 109.0 m. The maximum deviation angle of the well is 73.69 擄, and the length of expansion bellows is 132.7 m in DPT-112 well. Through the research in this paper, obvious progress has been made in defining the downhole expansion state of expansive bellows, improving the performance stability of pipe strings and completing supporting tools, which provides a new technical means for improving the safety of downhole operation.
【學(xué)位授予單位】:中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2017
【分類號】:TE358
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