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Characteristics of measurements during drilling
Feb 14, 2019

1. Measurements during drilling are indirect measurements and must be done with special tools and instruments. And according to the measurement

The instrument's data is recorded and transmitted in different ways. Drilling measurements are divided into real-time measurements and post-mortem measurements.

 2. The size of the measuring instrument is limited by the wellbore and drilling tools, especially the radial dimensions of the downhole instrument must

Can be driven into the casing and the drill without affecting the flow of mud or creating excessive mud due to the instrument's running in.

Pressure drop.

 3. The downhole instrument is subjected to high pressure by the formation and mud, and the protective cylinder and seal of the instrument must be able to withstand this high

Pressure, but also should have a certain safety factor.

 4. Since the temperature of the formation varies with the depth of the well, the downhole instrument works in an environment above the ground temperature,

The downhole instrument has good high temperature resistance. Generally, the instrument with temperature resistance below 125 °C is normal temperature or conventional instrument.

The instrument with a temperature resistance below 182 °C is a high temperature instrument.

 5. Some instruments are subject to impact during use (such as the single multi-point inclinometer), and the drilling tool rotates (such as vibration of the MWD instrument in the turntable drill), drill bit and drill during drilling (eg MWD and wireline while drilling Instrument) and so on.

MWD

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