Measuring and testing – Borehole or drilling – Downhole test
Patent
1994-04-29
1995-09-12
Warden, Robert J.
Measuring and testing
Borehole or drilling
Downhole test
73382G, G01M 112
Patent
active
054489121
ABSTRACT:
An apparatus and method for conducting a precise gravimetry survey downhole in an earth formation. The apparatus includes an elongated closed, hollow, cylindrical pressure vessel. The vessel is suspended from a vessel cable which is used for lowering and raising the vessel within a borehole. A stepper motor is mounted inside a top portion of the vessel, and includes control electronics which communicates with and is controlled by a surface system located on the surface. The stepper motor is geared to drive a winch with a gravity meter cable attached to a gravity meter so that the gravity meter cable may be used to precisely raise and lower the gravity meter inside and along the length of the elongated vessel. When the stepper motor is activated and rotates the winch, the gravity meter cable raises and lowers the gravity meter. The stepper motor is geared to the winch in a fashion so that one step of the motor corresponds with a displacement of the gravity meter in a range of from about 0.01 to about 0.001 inch per step. This control of the displacement of the gravity meter is much smaller than the heretofore magnitude of depth error readings, which cause significant density error calculations. A location device in the form of an optical encoder, is attached to the top of the gravity meter for monitoring the position of the gravity meter inside the vessel at the time of each gravity meter reading.
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Gas Research Institute
Tran Hien
Warden Robert J.
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