In the air drilling process, the prebent pendulum bottom hole assembly pbpbha has excellent. It is able to locate contact points between bha components and wellbore wall, and also identify critical rotary spe ed rpm to avoid detrimental vibrations. The bottom hole assembly of the present invention includes a drill bit driven by a positive displacement drilling motor, the motor being constructed of tubular housings, one of said housings having a bend so as to cause the bit to drill directionally, another housing containing a rotor and stator to generate power, and a flexible section between the power generation housing and the bend. Pdf implementation of a bottomhole assembly program. Bottomhole assembly article about bottomhole assembly. The following discussion presents the detailed structure of each component. It is the lowest part of the drill string, extending from the bit to the drill pipe. Directional bottom hole assemblies drilling operation. Bottom hole assembly schlumberger technology corporation. Bottomhole assembly an overview sciencedirect topics. A method for selecting a bottomhole assembly, including performing a first. Introduction to bottom hole assembly bha post a comment. Bha components use of bha bottom hole assembly components.
The present invention provides a bottom hole assembly bha for connection to a. Hole direction is the angle, measured in degrees, of the horizontal component of the borehole or. An experimental rig for nearbit force measurement and drillstring acoustic transmission of bottom hole assembly bha. Bha components consist of varying tool types from stabilizers, cross over subs, torque reducers, float subs, float valves, bull noses, zbits, pony collars, and drill collars. The most common components of the bha are drill collars, stabilizers, shock absorbs, jars, reamers, heavy weight drill pipe and the drilling bit.
Directional bottom hole assemblies a conventional rotary drilling assembly is normally used when drilling a vertical well, or the vertical or tangent sections of a deviated well. Dynamics of the bottom hole assembly during drilling operations. Nonmagnetic bha components to reduce the magnetic interference by steel components, nonmagnetic drill collars andor. The bottomhole assembly bha is the component of the drill string that includes the core bit, outer core barrel, various subs, and the drill collars.
Today, the bottomhole assembly serves several useful purposes, in addition to the simple need to effectively load the bit with drill collar weight. A bottom hole assembly bha is a component of a drilling rig. Bottom hole assemblies sperry drilling services 2006 force components dc fn normal. Bhapro is a bottom hole assembly modeling software that calculates the stress and bha components under complex downhole loading conditions. An experimental rig for nearbit force measurement and drillstring acoustic transmission of.
1157 632 1077 1025 202 1494 349 1362 35 1303 901 1198 181 1650 1521 1292 1312 110 471 713 1585 540 167 257 409 1226 438 890 1118 301 612