Table 2 - uploaded by Lewis Buitrago
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Source publication
There is an ample of field evidence that PDC cutters density and layouts affect drilling efficiency. Still, however, there is no reliable model of the PDC bit performance allowing determination of these bit design features for the specific bit's applications. In order to better understand the relationship between rock properties and PDC cutters lay...
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This paper describes an integrated methodology to characterize shales from an engineering point of view. Shale samples from offshore Brazil were used throughout the study. The proposed methodology includes laboratory tests designed to characterize the rock individual constituents, i.e., solid particles and pore fluid, and to describe the rock micro...
Citations
In order to improve the ROP (rate of penetration) of complex structure and deep wells and reduce the energy consumption of rock breaking during the drilling process, a core drill bit with negative pressure adsorption effect is developed. Rock-breaking energy consumption, ROP, negative pressure effect and rock carrying capacity of new drill bit are studied. Numerical example is conducted to analyze the relationship between the characteristic parameters of drill bit and cutting velocity and experimental tests are carried out to verify the theoretical model and the results of calculation examples. The calculation results indicate that with the increase in the cutting velocity, the axial and tangential forces and the ROP increase and the power consumption of drill bit decreases. The nozzle equivalent size of the new drill bit can be designed as 0.03 mm. According to the experimental results, as the flow rate of fluid increases, the power consumption of new drill bit decreases and the ROP increases. Compared with the conventional bit, the reduced ratio of power consumption of new drill bit is between 8% and 25%, and the ROP is increased by more than 45% in some sections, which show the rock breaking effect of new drill bit is better. The new drill bit can be used in the exploitation of oil and gas well drilling technology with new conditions, and also can provide technical support for improving rock breaking efficiency and ROP in the drilling process.
The goal of this study is to quantify the hole enlargement caused by drillstring stabilizers and the relation of this enlargement to the drilling parameters, contact forces, and rock strength. For this purpose, an extensive test campaign was conducted. In each test, a real-size stabilizer is placed within a predrilled hole in a mortar block. A side force is then applied as the stabilizer is rotated and moved downward. The change in the hole diameter is measured using a laser scanner before and after completing the experiments. The results of these experiments demonstrated the extent of the effect, which the stabilizers can have on the final borehole shape and quality. A simple implementation within an existing in-house steering prediction model is proposed to address this problem. Numerical simulations are presented to show the benefit of capturing borehole enlargement by stabilizers.
