In this paper, we regard the friction between the
drill string and the borehole as the orthotropic friction, and establish a FE model for the horizontal
drill string and the borehole system based on the finite element method.
The
drill string consisted of drill pipe with upset connections both inside and outside, thus producing internal dual diameters.
Figure 11 shows the axial force distributions for different 5"
drill string components including SDP, HWSDP (heavy weight steel
drill string), and ADP With the increase of well depth, the axial force firstly increases and then decreases.
The buckling behavior of the rotational
drill string in horizontal well is affected by many factors.
This innovation replaces rotation of the entire
drill string with independent rotation of the drill head, using a downhole turbine-driven mechanism.
(3) The nonzero time propagation of the torsional force disturbances along the
drill string is neglected.
In our work, effects of mud properties, drillstring tripping speed, and hole and
drill string configuration; on swab and surge pressures were investigated by developing a computer code and transforming this code into a graphical technique.
H&F Drilling Supplies, which specialises in casing and piling applications and supplies all components in the
drill string, is one of Atlas Copco's distributors in the country.
National Oilwell Varco (NOV) and Schlumberger have created a joint venture to provide high-speed
drill string telemetry systems to improve the efficiency and safety of oil and gas operations.
To operate the drill, the hammer contains a water-driven piston that strikes the
drill string adapter to create shock waves, which then travel through the
drill string and into the drill bit.