Assembly bottom directional drilling hole


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US Patents 4,, and 4,, describe a downhole adjustable sub which can provide either a bent or straight BHA according to requirements, the sub being activated by dropping a ball through the drillstring into the sub so as to activate a clutch mechanism. A fixed assembly has only one directional tendency. Housing 30 includes a reduced diameter portion 40 having an outside diameter 42, an inside diameter 44, and a length The greater the bend angle of bent housing 16 and the greater the build-up rate, the greater the side loads. The dimensions and flexibility of the BHA below the stabilizer should be such that that portion will not sag to the extent that it contacts the borehole wall when the drillstring is inclined to vertical. A downhole motor may be used as well. The reduction of the stiffness of the flexible section, in conjunction with the calculated optimum placement of the bend in the bent housing and the control of the three contact points which determine the curvature of the borehole being drilled by the drill bit, result in many advantages over the prior art.
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bottomhole assembly - Schlumberger Oilfield Glossary


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Bottom hole assembly

Various Rotary Assemblies have been designed till date by placing stabilizers at various positions in a BHA and observing the result thus produced. Once a dropping trend has been established, moderate WOB can be used to achieve a higher penetration rate. The bit side force is the most important factor affecting the drilling tendency. The BHA design objective for directional control is to provide the directional tendency that will match the planned trajectory of the well.
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Assembly bottom directional drilling hole
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