METHOD OF DRILLING FLUID PRESSURE MEASUREMENT IN WELL Russian patent published in 2020 - IPC E21B47/06 E21B44/00 G01L7/00 

FIELD: oil, gas and coke-chemical industries.

SUBSTANCE: invention relates to oil and gas industry and, in particular, to method of drilling fluid pressure measurement in well. Proposed method comprises changing vibration frequency of balanced mechanical oscillation system by changing its moment of inertia. Imbalance is introduced into balanced mechanical oscillatory system proportionally to change of drilling fluid pressure. Frequency characteristic of unbalanced mechanical oscillatory system is built. Lower and upper cut-off frequencies are selected, the pass band is determined on the frequency characteristic and the quality factor of the unbalanced mechanical oscillatory system is calculated proportionally to the change in pressure of the drilling fluid in the well according to the mathematical expression , where ƒ₀ is natural oscillation frequency of balanced mechanical oscillatory system, Hz, 2Δƒ - pass band of unbalanced mechanical oscillating system, Hz, α is a coefficient of proportionality of 1÷1.3.

EFFECT: technical result is increase in drilling mud pressure measurement accuracy.

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