The Future of Downhole Drilling Tool Selection
matched to the actual motor power section being utilised. To address this problem, Motor Matcher software4
has been developed that allows a logical and quantitative approach to bit selection for motors.
This unique software comprises an interface that uses an extensive database that contains logic tables describing the multidimensional characteristics of the motor and the bit. There are two phases to the tool:
1. configuration of the desired motor; and 2. selection of the drill bit.
The first phase allows the user to select a specific power section, inputting the parameters expected in the application. The tool automatically calculates the revolutions per minute (RPM), torque and horsepower and returns these as a graphical and numerical output (see Figure 1). This can be checked for suitability and either selected or another search undertaken until the optimal power section is derived. At this point, the software tool allows the user to configure the appropriate drive shaft assembly, bearing assembly and adjustable assembly that are required to meet the demands and expectations in the specific application.
Once the motor is configured, the software tool will reference the logic tables to derive the optimal bit. Each logic table is in essence a matrix of formation type and motor torque capability against key characteristics of the drill bit. The latter includes:
• length of the drill bit; • gauge length;
Figure 1: Graphical and Numerical Outputs from the Initial Phase of the Motor Matcher Software
•
gauge design, including cutting structure, profile and geometry;
• aggressivity index; • durability index; and • lateral stability index.
Centek’s all-new centralizer
Centek’s radical Under-Reamed Offset centralizer (UROS) raises the bar on centralizer technology. Designed specifically for under-reamed well sections, the Centek UROS is as spectacular in performance as it is in design.
UROS can achieve significant reductions in:
Once in the open hole UROS expands to its design dimensions, providing optimum centralization and an aid to well clean-out and cementation.
Station View, Forde Road, Brunel Industrial Estate, Newton Abbot, Devon TQ12 4AE Tel: +44(0)1626 337636 Fax: +44(0)1626 353278
Web: email:
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