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- W2924187816 abstract "Recently, a new type of jet mill bit (JMB) has been introduced to improve the cutting transport efficiency in horizontal drilling by comminuting cuttings into dust-like particles immediately after the cuttings are generated. To promote the application of JMBs in the field, in this work, JMBs were further improved by including junk slots (JS) all around to allow cuttings to flow through the annulus and thereby prevent sticking from occurring while tripping out. Moreover, numerical and experimental investigations on the feasibility of horizontal drilling with the new type of JMB were carried out. The finite element method was used to analyze the strength of the new type of JMB, and flow field simulation analysis was also performed for JMBs with different sizes of JS. The simulation results indicated that the weakest point of the JMB was located at the bit connection instead of the bit frame, and it was demonstrated that the structural strength of the JMB met the requirements of actual working conditions. The JMB JS had a negative effect on promoting the upward return of cuttings from the bottom of the hole, and the larger the slot sizes were, the more negative the effects. Through a trip-out experiment with the new type of JMB, this paper studied the influence of the slot size on the trip-out process safety. The experimental results indicated that the minimum safe slot width was 60 mm. Finally, in a synthesis of the simulation and experimental results, the reasonable range of slot width was determined to be 60–70 mm; the aforementioned range was the most suitable for the bit based on safety and efficiency considerations. This paper provides guidance for the improvement and application of JMBs." @default.
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- W2924187816 date "2019-04-04" @default.
- W2924187816 modified "2023-10-17" @default.
- W2924187816 title "Numerical and Experimental Investigation on the Feasibility of Horizontal Drilling With a New Type of Jet Mill Bit" @default.
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- W2924187816 doi "https://doi.org/10.1115/1.4043246" @default.
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