RU200894U1 - CENTRIFUGAL-GRAVITATION GAS-SESSION FILTER - Google Patents

Abstract

The utility model relates to the oil and gas industry, to devices for separating multiphase mixtures. A gas-sand separating centrifugal-gravity filter is described, the main part of which is a sand separating filter with a cylindrical body, including a cylindrical filter body and a hollow multi-pass spiral screw installed inside the body, including a smooth cylindrical section, section with helical blades of constant increased pitch, section with a spiral of variable pitch, section with a spiral of constant pitch. Technical result: a gas-sand separating centrifugal-gravity filter capable of effectively separating multiphase gas-liquid-solid mixtures was obtained.

Description

The utility model relates to the oil and gas industry, to devices for separating the solid phase from multiphase mixtures consisting of solid, liquid and gas phases.

Known application for a patent of the Russian Federation for the invention of the Russian Federation No. 2004115172. The application describes a hydrodynamic filter containing a cylindrical body with pipes for inlet of filtered liquid, outlet of filtrate and discharge of contaminated suspension. In this case, the filter element is installed coaxially with the body, and in the center of the body concentrically to the filtering element a screw with a hollow shaft is rigidly installed, which is equipped with turns with a variable pitch, and the decrease in the pitch of the turns is directed in the direction of the fluid movement, and the end of the hollow shaft is equipped with slots along the generatrix intended to remove the thickened suspension.

The disadvantage of the known solution is the poor quality of separation of multiphase mixtures of gas-liquid-solid.

The problem to be solved by the claimed utility model is to obtain a centrifugal-gravity filter capable of effectively separating multiphase mixtures.

The problem is solved by using a gas-sand separating centrifugal-gravity filter, the main part of which is a sand separating module with a cylindrical body, a multi-pass spiral shaped hollow screw installed inside it, including a smooth cylindrical section, a section with helical blades of constant increased pitch, a section with a variable pitch spiral and a section with a spiral of constant pitch, and a gas separation module is installed at the exit from the section of the screw with a spiral of constant pitch.

The spiral of the sand separating auger is abrasion-resistant, with a variable pitch and a minimum hydraulic resistance, and provides a given fluid flow rate.

The smooth cylindrical section changes the radial direction of the GZHM in the inlet holes to the axial one.

The section with helical blades of constant increased pitch stabilizes the flow of the gas mixture and pre-twists it around the screw axis.

The next section with a variable pitch smoothly accelerates the rotation of the liquid lubricant flow around the screw axis and reduces the channel section.

The section of the constant pitch ensures the rotation of the HGM around the screw axis with a constant angular velocity, laminar flow in the channel cross section and a given flow rate. In this section, under the influence of centrifugal force, the denser particles of the liquid lubricant mixture are thrown to the outer edge of the screw spiral and these dense sand particles move along the outer edge of the screw to the flow divider.

Multichannel flow divider, located in such a way that the flow of sand particles is directed into one of the screw channels and at a given angle and speed is thrown down into the sludge accumulator (sand collector).

Separated GZhM without mechanical impurities under the influence of vacuum created by the pump turns up and is sucked into the inner cavity of the screw and then goes to the pump intake.

At the lower end of the cylindrical body of the sand separation module, there is a thread or other detachable connection for attaching a solids settler (sand collector).

The gas-sand separating centrifugal-gravity sand separating filter is equipped with a gas separating module. In this case, the cavity of the sand separating screw communicates with the cylindrical cavity of the gas separating module housing, fixed above, forming a single filter cavity.

The gas separation auger has an anti-corrosion coating, a constant pitch, optimal for separating the upward flow of gases and combining bubbles. A gas branch pipe and a connecting sub, in which a gas bypass valve is mounted, are fixed to the top of the gas separation module body.

The sand separating and gas separating modules are mounted using any detachable and one-piece connection, which ensures a rigid connection of the elements, structural strength and freedom of the filter cavity from protruding fastening elements.

In fig. 1 shows a drawing of the filter.

The gas-sand separating gravity filter consists of the following main units and elements:

1. Gas separation module (MGS);

2. Sand separating module (MPS);

3. Plug;

4. Gas outlet valve MGS;

5. Auger MGS;

6. MPS inlets;

7. Hollow screw MPS;

8. Splitter of the MPS stream;

9. Corps of the Ministry of Railways.

The work of the gas-sand separating centrifugal-gravity filter is carried out in the following way.

The principle of operation of the gas-sand-separating gravity filter consists in the passage of the gas-liquid mixture (LHM) through the inlet holes 6 of the housing 9 of the MPS module 2. Further along the annular space formed by the hollow screw MPS 7 and the housing 9 along a descending trajectory, the flow of LHM rushes down. Passing along the spiral of the screw of the hollow MPS 7 and the channels of the flow separator 8, the gas-liquid mixture receives a given speed and direction with the distribution of mechanical impurities along the flow channels of the flow separator. Mechanical impurities under the action of centrifugal forces are thrown to the inner surface of the housing 9, are concentrated and thrown out by a dense helical flow into the tubing pipes - separation of particles of mechanical impurities occurs. Under the action of gravity, particles of mechanical impurities settle into the tubing pipes installed between the sand separating module 2 and the plug 3.

The flow of the gas mixture cleaned from mechanical impurities turns 180 ° upward and along the inner cavity of the hollow MPS 7 screw enters the MGS 1, in the body of which the MGS 5 auger is installed. The flow of the gas mixture moves upward along the spiral of the MGS 5 auger. Under the action of centrifugal forces, separation from the gas mixture occurs gas phase by combining small gas fractions into larger ones along the screw axis. The separated gas through the central branch pipe and gas outlet channels of the gas outlet valve 4 is diverted into the annular space of the well, and the degassed liquid through the annular channel enters the pump intake.

Instead of the gas-separating module, the gas-sand separating centrifugal-gravity filter can be equipped with an annulus separator 1, separating the annular space of the well into the zone of fluid flow into the inlets 6 of the sand separating module 2 and the zone for receiving fluid cleaned from mechanical impurities into the pumping equipment. In this case, the cavity of the sand separating screw communicates with the cylindrical cavity of the annulus separator, fixed above, forming a single filter cavity. Above and below on the casing of the annular space separator, protective upper 5 and lower 10 centralizers are installed, preventing damage to the collar 11 during running and lifting in the well.

The degree of purification of the multiphase mixture on the proposed gas-sand-separating centrifugal-gravity filter reaches 99.9%.

Claims (2)

1. Gas-sand-separating centrifugal-gravity filter, the main part of which is a sand separating module with a cylindrical body, including a cylindrical filter body, a hollow multi-pass spiral screw installed inside the body, including a smooth cylindrical section, a section with helical blades of constant increased pitch, a section with a variable pitch spiral , a section with a constant pitch spiral, and a gas separation module is installed at the exit from the section of the screw with a constant pitch spiral. 2. Gas-sand-separating centrifugal-gravity filter according to claim 1, characterized in that a multi-channel flow divider is installed at the outlet of the section of the screw with a constant pitch spiral.

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