Abstract
The radial jet drilling (RJD) is a key technology to improve the development efficiency of low-permeability oil and gas resources. In order to seek a reasonable hydraulic engineering parameter combination of hydraulic radial jet drilling, to obtain the optimal hydraulic energy distribution, a jet radial horizontal drilling simulation experiment system of the casing windowing is designed. A sequence of experimental investigations focused on engineering parameters of pump displacement, rotating speed, and frequency of high-pressure plunger pump is performed, and the operability and the feasibility of the experiment are verified. To evaluate the maximum drillable length and the self-propelled force of a jet nozzle, a 3D numerical model based on ANSYS-CFX is developed to evaluate the effects of the inlet flow displacement, the flow rates ratio K , and the angle ratio F : B of the forward orifice and backward orifice of the jet nozzle on its maximum drillable length and self-propelled force by sensitivity analysis. Finally, the comparison of numerical simulation results (Ln), mathematical results (Lm), and experiment results (Le) of the maximum drillable length are presented. It is observed that the simulation results are consistent with the experiment results with an average accuracy of 97.07%. Therefore, the proposed numerical model has a good performance in predicting the maximum drillable length of the multiorifice nozzle. The research results can provide theoretical guidance for improving the rock breaking and drilling capability of radial jet drilling technology.
Highlights
Radial jet drilling (RJD) technology was imposed in the 1980s [1]
It is observed that both the maximum flow rate of forward orifices and backward orifices increase as the inlet displacement increases
The research presented in this paper focused on the numerical simulation and experiment of a multiorifice nozzle in radial jet drilling
Summary
Radial jet drilling (RJD) technology was imposed in the 1980s [1]. In the exploration of oil and gas wells, the application of radial jet drilling (RJD) technology can effectively reduce drilling costs for the unconventional oil and gas wells, abandoned renovation wells, and geothermal development wells, especially the exploration or development wells with poor fracturing effects [2,3,4,5]. Liao et al conducted the rock-breaking experiments of the self-propelled jetting efficiency and developed a numerical model of the selfpropelled force of multiorifice nozzles [17]. For all the above studies, the optimization design of hydraulic parameters of radial horizontal wells and conventional drilling technologies are different in terms of optimization objectives and constraints. The existing hydraulic parameter design methods are not applicable to radial horizontal well technology. A sequence of simulations are develop to investigate the effects of the inlet flow displacement, the flow rates ratio K, and the angle ratio F : B of the forward orifice and backward orifice of the jet nozzle on its maximum drillable length and selfpropelled force by a series of sensitivity analysis. The design method of hydraulic parameters for radial horizontal drilling is proposed, which provides theoretical support for the application of radial horizontal well technology
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