Picture of bottom hole assembly


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Bottom hole assembly

At shallow depths jar impact is not achieved because of lack of pipe stretch in the working string. At each end of the drill pipe tubular, larger-diameter portions called the tool joints are located. The frequency of rotation, and hence vibration of the pipe string, is tuned to the resonant frequency of the system. Bodine introduced the concept of resonant vibration that effectively eliminated the reactance portion of mechanical impedance , thus leading to the means of efficient sonic power transmission. If the distance between the bit and the first stabilizer is too large, the bit will begin to tilt upward, and the drop rate will reach a maximum. Integral-blade stabilizers are the most expensive but very rugged, making them the ideal choice in hard and abrasive formations.
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Bottom hole assembly - Wikipedia

Drill pipe[ edit ] Drill pipe makes up the majority of the drill string back up to the surface. In such a case the first stabilizer is placed 30—45 feet behind the bit. They play a major part in directional drilling as it helps determine the well-bore path and angle. In the case of a straight hole then the bit simply continues downward. When the jars reach their firing point, they suddenly allow one section of the jar to move axially relative to a second, being pulled up rapidly in much the same way that one end of a stretched spring moves when released.
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Picture of bottom hole assembly
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bottom hole assembly photos

Picture of bottom hole assembly



Description: The resultant forces imparted to the fish is based on the following logic: Type 1, standard simple configuration, uses only drill pipe and drill collars. A corresponding pressure drop across the tool would indicate that the tool has fully deployed. The tools and expertise are normally supplied by an oilfield service company. Although a slick assembly is simple and economical, it is difficult to control and maintain the drop tendency.

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