Rotary bottom hole assembly

The Bottom Hole Assembly BHA is a key component of the drilling system, consisting of various components and tools including the drill bit itself which operate at the bottom of the wellbore and physically drill the rock. The BHA is connected to the drilling rig by the drill pipe, an extendable hollow tube which conveys the mechanical and hydraulic energy and movement from the surface rig systems to the bottom hole assembly. This complex arrangement of tools varies considerably depending on requirements, and can stack up to 1, ft long. The BHA has become more complex over time to suit the needs of drilling operations and to accommodate different tools that have been developed. This article will explain the desirable objectives of the BHA in both vertical and directional drilling.
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21.07.2021
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Bottom hole assembly (BHA) design for directional control

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BHA Components - Bottom Hole Assembly - Hole Opener

BHA Components consist of varying tool types from stabilizers, cross over subs, torque reducers, float subs, float valves, bull noses, z-bits, pony collars, and drill collars. These Bottom Hole Assmebly items are utilized in the drill string to achieve connection changes, regulate pressure, help guide the string, add or decrease the length between specific tool types, and generally add weight to the string. In general, every drill string will utilize cross over subs, float subs, stabilizers, and some sort of collars. Specific applications will dictate if a certain BHA component is required, how many of each product, and where they are placed within the drill string. There are many features to the various types of bottom hole assembly components, click on our specific offerings to find out more. Looking for more information or specific tool spec sheets? Contact us today for more information!
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Bottom Hole Assembly 101

Millheim, Keith, Jordan, Steven, and C. The complex behavior of most bottom-hole assemblies can be analyzed using the finite-element method. If the wellbore trajectory, hole diameter, fluid density, and assembly dimensions are known, various properties can be determined.
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