Abstract
An analytical model for predicting the productivity of Radial-lateral wells (RLW) drilled using radial jet drilling technology was developed in this work. The model assumes uniformly distributed equal-geometry laterals draining oil or gas under pseudo-steady state flow conditions within the lateral-reached drainage area. A numerical simulation and production data from three field cases of RLW were used to compare and validate the model. The result indicates that the model overestimates the well production rates for wells by 7.7%, 3.25%, and 8.8%, respectively. The error is attributed to several sources including, lack of data for well skin factor, uncertainty of horizontal permeability (kH) in the well area, uncertainty of permeability anisotropy (Iani), and uncertainty in bottom hole pressure (pw). Error analysis of uncertainties in kH, Iani, and pw showed that the model could predict productivity well with an acceptable error (10%) over practical ranges of these parameter values. Parameter sensitivity analyses showed that an increasing number of laterals, lateral length, and horizontal permeability would almost proportionally increase productivity. Well productivity is sensitive to well skin factor and oil viscosity, but not sensitive to the radius of the lateral.
Highlights
Radial-lateral wells (RLW) are drilled and completed using coiled tubing with radial jet drilling (RJD) tools in both conventional and unconventional reservoirs
The accuracy of the model was verified by comparison to the production performance of three wells. This model can be used for the optimization of RJD operations for maximizing RLW productivity
Pseudo-steady state flow conditions are reached within the lateral-reached drainage area
Summary
Radial-lateral wells (RLW) are drilled and completed using coiled tubing with radial jet drilling (RJD) tools in both conventional and unconventional reservoirs. Energies 2020, 13, 6386 original RJD technology, a new proposed RJD method requires a bendable high-pressure pipe to complete of the casing, and carry highly-pressured fluid to [13]. Hydraulic milling of the the milling casing, and carry highly-pressured fluid to break the rock fracturing was fracturing was investigated to integrate into the RJD procedure [14,15,16,17]. Was as aexplored viable option to achieved satisfactory [18] All these all these improvements show added benefits, what constitutes satisfactory performance is notThis clear. Improvements show added benefits, what constitutes satisfactory performance is not clear This is because of the lack of a standard base of well conductivity for comparison.
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