Page 38 - 6373

Inclinometer casings are brass or non-magnetic steel. They
filled 75% of volume by the mixture of transformer oil with
naphtha or kerosene to lubricate parts and provide damping
movement switching mechanism and the parts of the measuring
instrument. Measuring the azimuth and curvature angle by these
inclinometers is only possible in not cased wells. In cased wells
with steel columns it can only measure the angle of curvature.
Error in determining the azimuth and curvature angle in
wells connected with violation of isolation circuits and wires
cable, deviation power supply current from the desired value, and
nonparallel axes of inclinometer and borehole, not fine-tune the
mechanical and electrical appliance schemes. Not parallel axes of
the well and the device caused by the presence of cavities and
uneven thickness clay crust on the walls of the wells. To reduce
measurement errors  and  the latter increases the length of the
device by attaching it to an extension cord that serves as a load and
allows keeping the position of the device, along the axis of the
well. Insulation resistance circuit device and the cable cores should
be less than 2 MOhm.
Technical characteristics of some types of inclinometers are
shown in Table 5.1

Table 5.1 – Specifications of inclinometers Measurement

error of
distortion
Name Diameter, m Length, mm Weight, kg Number of cores cable The limits of angle measuring, degrees The limit temperature, С The limit pressure, Pa·10 8 element, degree

Angle Azimuth

38