Automatic detection alarm method for clogging of high pressure airtight filter

Abstract

The invention discloses an automatic detection alarm method and device for clogging of a high pressure airtight filter; and the method and device are designed for automatic detection and alarm of a clogging situation of the high pressure airtight filter. An outlet channel and an inlet channel of the high pressure airtight filter are respectively provided with an outlet pressure detector, an inlet pressure detector and an inlet mass flowmeter, which are connected with a core controller. The core controller employs an ''experimental experience set clogging alarm threshold model'' or a ''Darcy-Weisbach formula calculation clogging alarm threshold mode'' to determine a clogging alarm threshold; and based on the actual measurement data, the core controller calculates a pressure difference value between the inlet and outlet of the filter, and compares the value with the clogging alarm threshold, so as to realize real-time alarm sound by the alarm when the filter is severely blocked, and prompt the drilling technical personnel to provide maintenance. The invention provides important safety guarantee for operation safety of control pressure drilling pipe and other high pressure oil and gas transportation pipeline.

Description

technical field [0001] The invention relates to an automatic detection and alarm method for blockage of a high-pressure airtight filter, which belongs to the technical field of oil and gas drilling engineering. Background technique [0002] With the increasing number of exploration and development activities in deep water and deep complex formations, the application of ground choke manifolds used in drilling engineering is becoming more and more extensive. Due to the limited pressure adjustment range, it is required that the cuttings particles in the mud flowing through the choke valve should not be too large, so as to avoid drilling accidents caused by blocking the choke valve and causing its failure. In order to protect the choke valve from being blocked, a high-pressure airtight filter is often used to filter out the larger particle cuttings carried in the drilling fluid before the choke valve is installed. [0003] However, the ability of the high-pressure airtight filt...

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Problems solved by technology

[0003] However, the ability of the high-pressure airtight filter to collect and filter cuttings is limited. When the filter material is too much to cause serious blockage, it must be repaired in time to avoid damage due to excessive pressure caused by excessive blockage of the high-pressure airtight filter, causing the choke manifold to be damaged. Other valves in the

[0004] Some filters are equipped with a pressure detector, but that only indicates the pressure inside the filter, that is, for fluids under normal pressure, sometimes it is known whether it is clogged by observing the fluctuation of the pressure inside the filter

But for the high-pressure airtight filter, the fluid flowing through the inside itself is a high-pressure fluid with pressure fluctuations, so the degree of serious blockage cannot be judged by this method.

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