AUTOMATED SYSTEM FOR CONTROL OF PROPERTIES OF DRILLING FLUID PREPARED BASED ON GASEOUS AGENTS Russian patent published in 2012 - IPC E21B44/00 E21B21/06 

FIELD: oil and gas industry.

SUBSTANCE: automated system, which maintains preset density of drilling fluid prepared based on gaseous flushing agents and includes test equipment and remote monitors, contains also commutator, commutator of analogue-to-digital converter of computer interface card and variable speed drives for prompt control of flow of liquid or gas component of gaseous agents. Accuracy of control and responsiveness of the system is reached by use of digital form of transmission and processing of data with high accuracy of conversion. For this system density control is performed not by direct measurement but by calculation based on analytic dependences using data recorded by test equipment installed on transportation lines of foam preparation system. On-the-spot maintaining of required density of foam is performed using variable speed drives installed on compressor plant and pump for foam-forming fluid.

EFFECT: improving efficiency of control of properties of drilling fluid prepared based on gaseous flushing agents - foam solutions by means of accurate and prompt response of the system to its probable changes.

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