摘要：Radial jet drilling technology (RJD) is an economical and efficient technology for the development of unconventional oil, gas, and geothermal resources. The self-rotated multi-orifice nozzle, which is the key for the hole-forming, is introduced and tested here. Its sandstone-breaking characteristics are researched by experiment, the influence of working conditions, lithology, axis length, jet pressure (15 similar to 40 MPa), and standoff distance (0 similar to 10 mm) is also studied. Moreover, optimal working parameters for continuous drilling are proposed. Results show that the self-rotating multi-orifice nozzle can effectively drill a large circular hole whose diameter is about 30 mm under the condition of fixed standoff distance or continuous feeding. The submergence conditions are helpful to improve rock breaking efficiency. The short-axis nozzle has good hydraulic performance and rock breaking ability. Uniaxial compressive strength affects rock breaking diameter, while permeability affects rock breaking depth and volume. The rock breaking diameter, depth and volume of sandstone both increase with the jet pressure. The rock breaking diameter increases with the standoff distance, while the rock breaking volume and depth are opposite. The diameter of the rock breaking hole decreased with the augment of the feeding speed. For the sandstone here, the jet pressure is recommended as 35 MPa and the feeding speed 0.03 m/min (1.8 m/h); laterals with a diameter of about 30 mm can be formed. The research results are expected to promote the development of RJD technology.

关键字：Radial jet drilling; Rock breaking; Nozzle; Sandstone; Oil and gas

ISSN号：0723-2632

卷、期、页：54 (11) , pp.5603-5615

发表日期：2021-11-01

影响因子：4.140400

期刊分区（SCI为中科院分区）：二区

收录情况：SCIE（科学引文索引网络版）,地学领域高质量科技期刊分级目录（国外T1）,EI（工程索引）

发表期刊名称：Rock Mechanics and Rock Engineering

通讯作者：戴佳成,刘鑫,李欢

第一作者：李敬彬,黄中伟,张广清

论文类型：期刊论文

论文概要：李敬彬,戴佳成,黄中伟,张广清,刘鑫,李欢，Rock Breaking Characteristics of the Self-rotating Multi-orifice Nozzle for Sandstone Radial Jet Drilling，Rock Mechanics and Rock Engineering，2021，54 (11) , pp.5603-5615

论文题目：Rock Breaking Characteristics of the Self-rotating Multi-orifice Nozzle for Sandstone Radial Jet Drilling