Patent GB-414646-A (GB)
Title: Improvements relating to clinometers
IPC: E21B47/022
Filed: 1933-01-06
Abstract: 414,646. Borehole clinometers. ANGLO-PERSIAN OIL CO., Ltd., Britannic House, Finsbury Circus, London.-(Pritchard, N. H.; Masjid-i-Sulaiman, Persia.) Jan. 6, 1933, No. 543. [Class 97 (ii).] A series of records of the angle of deviation and /or the direction of deviation of a borehole at different depths is obtained by passing loose elements down a freely suspended directing member -to a partitioned receiver. The elements are preferably released by clockwork during the timed lowering of the clinometer into the borehole. A disc 4, containing a series of distinctively marked balls in radially directed pockets spaced round its circumference, is driven by clockwork and delivers the balls singly at predetermined intervals of time to an aperture which permits them to pass through a shoot 11 and hollow universally mounted pendulum 12 to a receiver 17. The latter is divided into compartments by spaced annular walls, the inclination of the borehole being indicated by the compartment into which the ball is delivered. In the form shown in Fig. 2, the disc 4 delivers two balls simultaneously, one passing through shoot 11 and pendulum 12 to the receiver 17 and the other through shoot 20 and an identical pendulum 22 to a receiver 23 in which the walls are offset to those of the receiver 17 by half the width of a compartment, thus enabling twice the accuracy to be obtained by combining the indications. In a modification, the disc 4 delivers simultaneously to the pendulum 12 two balls of different sizes, the larger being retained in the upper receiver 17 whilst the smaller passes through apertures in the compartments of the upper receiver to the lower pendulum and receiver. In a further modification, in which a single ball is delivered to the pendulum 12, the latter when at its extreme inclination delivers the ball through a pipe to a second shorter pendulum having a larger range of inclinations. When the direction of inclination is to be indicated the disc 4 simultaneously supplies a ball to an inclination indicating pendulum and receiver and a ball to a pendulum moving over a pivoted receiver 27, Fig. 7, directed by a magnet or gyroscopic mechanism. The receiver 27 is divided by radial walls 33 into sectorshaped compartments in each of which the bottom slopes towards an arcuate aperture 35 arranged at differing distances from the centre for each compartment. In accordance with the direction of inclination, the ball falls in one or other of the compartments in the receiver 27 and from thence passes through an aperture 35 into the corresponding compartment of a receiver 23 divided by spaced annular walls. The receiver 23 is secured to a gimbal mounted pendulous frame 37 carrying the pivot pin 31 on which the receiver 27 rests. The latter has a depending tube 36 to which the magnets 28a may be attached. Alternatively one of the walls 33 may be a magnet. The accuracy of the directional indication may be increased by providing an additional pendulum and an angularly offset receiver or by making additional observations with the receiver 27 attached to the magnets 28a in slightly displaced angular relationships. In a further modification the magnitude and direction of the inclination may be indicated by a single pendulum delivering a ball to a magnetically directed pivoted receiver divided into compartments by annular and radial walls.