System for detecting drilling fluids outlet flow

Abstract

A drilling fluid discharge amount detecting system for oil-gas drilling machine, comprised of a blade wheel, direct current dynamo, casing, buffer port, level gage, controller, display alarm unit and purge valve etc. Drilling fluid discharge amount detecting is realized by controlling speed of the direct current dynamo. The invention is provided with drilling fluid discharge amount measuring and abnormal alarming functions. The purge valve is used for keeping clean of the blade wheel. The drilling fluid discharge amount detecting system of the invention is provided with simple structure, high measurement accuracy and wide detection range, which is specially suitable for small flow detection, It is a new type of instrument for detecting lost circulation and overflow, which reduces well drilling risk.

Description

Technical field [0001] The invention relates to a drilling fluid outlet flow detection system for oil and gas drilling, in particular to a volumetric drilling fluid outlet flow detection system, which belongs to drilling parameter detection equipment. Background technique [0002] In drilling operations, accurately measuring the outlet flow of drilling fluid is useful for detecting whether there is leakage in the drilled wellbore, and how much the leakage is; whether there is fluid in the formation invading the wellbore, and the amount of intrusion; It is of great significance to ensure the safety of drilling. [0003] At present, there are mainly the following types of drilling fluid outlet flowmeters for oil and gas drilling, and all of them have insurmountable weaknesses. [0004] (1) Target flowmeter, the drilling fluid is easy to stick and agglomerate on the target plate, seriously affecting the measurement accuracy, unable to detect small flow rate and unable to reali...

AI Technical Summary

Problems solved by technology

[0004] (1) Target flowmeter, the drilling fluid is easy to stick and agglomerate on the target plate, seriously affecting the measurement accuracy, unable to detect small flow rate and unable to realize quantitative measurement;

[0005] (2) Electromagnetic flowmeter is greatly affected by the conductivity of the medium to be measured, and requires a full pipe of the medium, which has low measurement accuracy and cannot detect small flows;

[0006] (3) Liquid level flow requires measurement of each drilling fluid tank. The measurement system is complex, difficult to install and maintain, and requires high calculation methods.

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