Importance

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Abstract

Apparatus used for the directional surveying of deep wells, i.e., 20,000-25,000 feet (6,096 meters-7,620 meters), and which is specifically identified as a gyroscopic directional surveying instrument having a high pressure and a high temperature capability, e.g., 24,000 pounds per square inch (1,632.65 atmospheres) and 450.degree. F. (232.22.degree. C.). While in its fully assembled configuration, the apparatus may be described as being exceptionally long (or at times unwieldy), e.g., 12-16 feet long (3.66 meters-4.88 meters), it is quite remarkable that it does not exceed three inches (76.2 millimeters) in diameter. Therefore, it may readily be lowered into the small diameter steel casing normally defining the walls of these deep wells. In view of its cumbersomeness, it is significant to note that the apparatus may readily be broken-down into upper and lower sub-assemblies when being transported to or from the well site. Moreover, structure is included for individually protecting each sub-assembly from the adverse affects of the extreme pressure and temperature. Therewith, the feasibility of 'on site' mating and demating of these sub-assemblies is achieved. Equally significant is that structure is included which readily enables the required physical access--at the ' on site' location--to the internally disposed gyrocompass, inclinometer, and camera systems, i.e., for the purpose of accomplishing certain initial preparations and/or calibration procedures.

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First Claim