RU93450U1 - FLOATING DEGASER - Google Patents

Abstract

 A float degasser, including a degassing chamber installed with holders from the lower and upper parts, which has an inlet and outlet of a gas mixture to relieve excess pressure, select an analysis of the gas mixture to be analyzed, and connect to the compressor inlet; an aerator located in the lower part of the degassing chamber, characterized in that the degassing chamber in it consists of pipes of different diameters coaxially mounted using fasteners in each other vertically, passing through the float: with the protrusion above the float up and with a large diameter - the upper pipe , and located under the float - in the submersible part with a smaller pipe diameter - the lower pipe; the lower edge of the upper pipe extends beyond the lower edge of the float with the exception of the formation of a horizontal gap between the pipes in any working position; the aerator has the shape of a ball and is made of ceramic chips, the lower edge of the lower pipe is designed as a meander along the contour of the lower circular section; the degassing working chamber has a cover in which four ports are mounted: one for the inlet and three for the above-mentioned outlets of the gas mixture.

Description

The utility model relates to the oil and gas industry, namely, to gas logging devices in the process of drilling oil and gas wells, in particular, for selection for analysis of the studied gas mixture during gas logging.

There are known designs of various types of degassers [SU copyright certificates for inventions No. 124384, No. 269875, No. 328247, No. 512446, No. 535414, No. 1479035, No. 1542567 and RU patents for inventions No. 2156162, No. 2271434, No. 2276249]. The task of all degassers is that the degasser capture most of the mud gases.

However, a significant part of these degassers makes it possible to capture only part of the gases in free and dissolved states in the drilling fluid. Serious interference in the work of degassers is caused by viscous solutions.

Float-type degassers are of most interest.

Known degasser drilling fluid float type, designed for continuous selection of free gas from part of the flow of drilling fluid at the outlet [http://www.geosferatver.ru/gaz/dp-1/dp-1.php]. The degasser is made of stainless steel sheet and contains a housing mounted on two cylindrical floats with the ability to adjust the depth of immersion in the drilling fluid. A radiator-type heat exchanger is mounted on the casing for condensation of drilling fluid vapor inside the degasser casing and devices for attaching it to the walls of the tank. The geometrical characteristics of the degasser ensure its buoyancy in drilling fluids of different densities. In the degasser housing there is an opening for communication of the gas collection chamber with the atmosphere, necessary for balancing the pressure inside and outside the chamber. To improve the conditions of gas evolution from the solution, the degasser is equipped with plate dividers in the form of a comb installed inside the housing perpendicular to the flow movement. The principle of operation is based on the separation of gas bubbles from the surface layers of the drilling fluid passing through the plate divider of the degasser, and the removal of the resulting air-gas mixture due to the vacuum created by the pump of the gas-air mixture transportation system installed in the station for geological and technological research of wells. The volume of the degassing chamber 3 dm ³ . The degassing surface area is 0.1 m ² , the adjustable immersion depth is 35 mm. The length of the degasser is 740 mm, the width is 390 mm, the height is 230 mm. The mass of the degasser is 6.2 kg.

Also known float degasser [Pomerants L.I. Gas logging. M., Nedra, 1982. P.57], consisting of a working chamber body made of stainless steel and mounted on foam floats, on which it floats in a flow of washing liquid (RV). The float degasser is installed at the wellhead and is fixed in the tank using stretch marks. Mounting the degasser on the floats ensures a constant position of the working chamber of the float degasser relative to the level of the pancreas in the tank, i.e. the constancy of the degassed volume of the pancreas to the volume of the gas phase in the working chamber of the degasser. The lower part of the float degasser body is open at the front. Partitions with slots are mounted perpendicularly to the direction of the pancreatic flow inside the casing, due to which there is a crushing of the pancreatic flow and a slight increase in the contact of the surface of the degassed pancreas with air in the working chamber of the degasser. In front of the housing there is a visor with holes for air to enter the working chamber. On top of the housing there is a trap-settler with a fitting for supplying the gas mixture from the degasser to the gas line.

The disadvantage of the above analogues is not always acceptable increased sizes, which does not allow the degassing process in containers of small volumes, and a low degassing coefficient of 1-2%.

The closest analogue to the claimed utility model is a float degasser with an integrating circuit [Pomerants L.I. Gas logging. M., Nedra, 1982. P.61-62 and SU copyright certificate for invention No. 5666223 for the same model]. The degasser is a stainless steel degassing chamber suspended on steel pontoon-type floats using devices that allow you to adjust the position of the degassing chamber in relation to the level of the flow of the pancreas in the tank. At the bottom of the chamber, an aerator unit is mounted connected to a portable compressor unit. The aerator block is a sealed chamber with a cover in the form of a membrane of oil-resistant rubber or several tubes of oil-resistant rubber connected in parallel to the compressor. In the membrane and aerator tubes there are 2,000 holes made with a pitch of 2 mm. In the upper part of the degassing chamber there is a cone with a reflector of spray of the pancreas and a fitting for connecting the aerator to the integrating circuit. A fitting is mounted on the cone for connecting the degassing chamber to a hydraulic shutter, which ensures that a small excess pressure is maintained in the chamber. The principle of operation of this float degasser is that the gas mixture extracted from the pancreas in the degasser chamber continuously circulates along the integrating circuit, repeatedly ≈2000 bubbles bubble through the pancreas in the degasser chamber and is continuously enriched with gas extracted from the pancreas by these bubbles. As the pressure in the degasser chamber increases, excess gas mixture is removed from the chamber through a hydraulic shutter and the specified overpressure is restored.

However, as well as in the above-mentioned analogues, this degasser is characterized by increased dimensions, which does not always allow it to work with modern equipment of drilling rigs, since the dimensions of these degassers are incompatible with the dimensions of the nodes, primarily with pockets of vibrating screens of drilling rigs.

The objective of the claimed utility model is to reduce the weight and dimensions of the float degasser while reducing cost and expanding the possibility of its use in different conditions, including the capacity of drilling rigs of small volumes.

The essence of the proposed solution lies in the fact that in the float degasser, which includes a degassing chamber from the lower and upper parts installed with the help of holders, which has an inlet and outlets of a gas mixture for: relieving excess pressure, selecting for analysis of the test gas mixture and connecting to the compressor inlet; the aerator located in the lower part of the degassing chamber, the degassing chamber is a pipe of different diameters coaxially mounted using fastening elements in each other, passed through the float: with the protrusion above the float up and with a large diameter - the upper pipe, and located under the float - in the submersible part with a smaller pipe diameter - the lower pipe; the lower edge of the upper pipe extends beyond the lower edge of the float with the exception of the formation of a horizontal gap between the pipes in any working position; the aerator has the shape of a ball and is made of ceramic chips, the lower edge of the lower pipe is designed as a meander along the contour of the lower circular section; the degassing working chamber has a cover in which four ports are mounted: one for the inlet and three for the above-mentioned outlets of the gas mixture.

The technical result of the proposed solution is achieved, inter alia, by replacing the geometry of the nodes and materials of the float degasser, from which the nodes (some with updated, others with a fundamentally different geometry) of its components are made in comparison with the closest analogue. The claimed solution is to design a float degasser in the form of two round vertically elongated bodies such as pipes, placed one coaxially with the other, in each other and with a certain exit of one pipe outside the other in their end parts in the middle part of the degasser where the float is installed, as well as the presence of an aerator of a certain structure and shape in the form of a spherical porous ceramic body, as well as the design of the bottom of the final part of the lower pipe in the form of a meander along the contour of the lower circular section.

The inventive utility model is illustrated using Fig., Which shows a General view of the degasser. In FIG. positions 1-14 are indicated:

1 - degassing chamber;

2 - cover;

3 - float;

4 - upper pipe;

5 - lower pipe;

6 - meander;

7 - aerator;

8 - input port - for connecting to the channel on the aerator;

9 - channel to the aerator;

10 - port for relieving excess pressure;

11 - port for selection for analysis of the investigated product;

12 - port for connecting to the compressor input;

13 - holders;

14 - a rod of fastening.

The float degasser has a degassing chamber 1 with a cover 2 and a float 3, dividing the device into the upper — above the float 3 part and the lower under the float 3 — the immersion part. The latter is made of a form-containing material - foam, wrapped with fiberglass, over which an impregnation is applied, which prevents the aggressive action of the pancreas on the material of the float 3. The degassing chamber 1 is made in the form of a vertical elongated structure consisting of two coaxial vertically oriented pipes 4, 5 of different diameters, the top 4 larger diameter, located above the float, lower 5 - smaller diameter, located in the submersible part. The lower pipe 5 of the degassing chamber 1 is configured to extend the upper edge inward of the upper pipe 4 into the part of the volume occupied by the lower part of the upper pipe 4. At the lower edge of the immersion part of the lower pipe 5, there is an inhomogeneity in the form of a meander 6 made along the circumference in section of the end part of the lower pipes 5. Inside the lower pipe 5, a spherical aerator 7 is made from ceramic bottom with a diameter smaller than the diameter of the lower pipe 5 of the degassing chamber 1. Between the aerator 7 and the side wall of the lower pipe 5 s an annular gap. At least four ports 8, 10, 11, 12 are made in the lid 2 of the degassing chamber 1: one for entering - connecting 8 to channel 9 to the aerator 7 and three output ports, respectively, for relieving 10 overpressure, selecting 11 for analysis of the test product , connections 12 to the compressor input.

Holders 13 are installed inside the volume of the degassing chamber, which provide centering of the pipes 4, 5 and do not allow breaking symmetry in the orientation of the elements inside the degassing chamber 1. The mounting rod 14 also serves to fasten the elements, in particular, the lid 2 of the degassing chamber 1 and is brought up behind it limits.

Float degasser works as follows.

When you turn on the compressor (figure 1, the compressor is not shown, since it is not included in the number of components that make up the claimed device), the suction (pumping) of the gas mixture from the degassing chamber 1 with the pancreas begins. At the same time, a gas mixture or simply air is injected, depending on the amount of gas in the pancreas, into the aforementioned degassing chamber 1 through a pancreatic column, for example, a spherical aerator 7 made of ceramic chips. A similar movement of the gas mixture from the degassing chamber 1 to the compressor and from the compressor to the degassing chamber 1 noted above is characteristic not only of the inventive degasser, but also of other previously existing devices for degassing the drilling fluid (see Pomerantz L.I. Gas logging . M., Nedra, 1982. P.62). The named structural elements forming a circuit: compressor - port 8 - aerator 7 - pancreas pole - port 10 - compressor form an integrating circuit through which the gas mixture is continuously circulating, which is enriched with each cycle or depleted depending on the saturation of the pancreas at a given time. Despite the fact that the pancreatic column is not a structural element, it is an important connecting link in this closed system - an integrating circuit that provides the main operation and function of the device. The bubbling of the pancreas occurs in the lower pipe 5 of the degassing chamber 1 over the entire column of liquid located in the volume of the lower pipe 5.

The difference of the proposed solution at this stage of the work of the float degasser is the presence of specially designed ports - inlet and outlet, installed directly in the cover 5 of the degassing chamber 1. Float degassers with similar covers were not found in the search process when preparing the application. The pancreas, moving in the volume in which the inventive float degasser is located, enters the cavitation zone of the aerator 7 on the meander 6, carrying out the primary formation of bubbles on its sharp edges. The compressor creates pressure in the aerator 7 and, thereby, causes the pancreas to rise from the lower edge of the immersion part of the device to the upper, where the main degassing of the pancreas occurs, accompanied by overflowing it through the upper edge of the immersion part - the lower pipe 5.

The gas bubbles contained in the pancreas are connected with large bubbles, moving upward along the submersible part, where, when the pancreas overflows over the edge, they collapse with the release of gas to the upper part - to the upper pipe 4 of the degassing chamber 1. Degassing chamber 1 through one of ports 12 of the cover 2 is connected to the inlet of the compressor, which ensures the continuity of the degassing process. The excess pressure, without disrupting the operation of the device, is discharged into the atmosphere through the port to relieve excess pressure 10. From the degassing chamber 1 through port 11, the gas mixture is taken for analysis. The input port of the integrating circuit 8 is used to connect to the channel 9 on the aerator 7.

Examples.

The inventive utility model is implemented in experimental samples manufactured at one of the enterprises of Saratov. They represent the totality of the corresponding pairs of pipes - lower and upper with dimensions corresponding to each other, for example: the length of the upper pipe is 160 mm, the diameter of the upper pipe is 110 mm, the length of the lower pipe is 90 mm, the diameter of the lower pipe is 135 mm. The pipe material is polypropylene. The thickness of the float is 50 mm, the width of the float is 160-165 mm, the length of the float is 290 mm and, if necessary, more. The meander pitch is 20 ÷ 30 mm. Products are being prepared for practical testing. The found constructive improvements are practically justified, the changes described above are introduced into the samples, which justified their constructive expediency.

Claims (1)

A float degasser, including a degassing chamber installed using holders from the lower and upper parts, having an inlet and outlet of a gas mixture to relieve excess pressure, select for analysis the test gas mixture and connect to the compressor inlet; an aerator located in the lower part of the degassing chamber, characterized in that the degassing chamber in it consists of pipes of different diameters coaxially mounted using fastening elements in each other vertically, passed through the float: with a protrusion above the float and with a large diameter - the upper pipe , and located under the float - in the submersible part with a smaller pipe diameter - the lower pipe; the lower edge of the upper pipe protrudes beyond the lower edge of the float with the exception of the formation of a horizontal gap between the pipes in any working position; the aerator has the shape of a ball and is made of ceramic chips, the lower edge of the lower pipe is designed as a meander along the contour of the lower circular section; the degassing working chamber has a cover in which four ports are mounted: one for the inlet and three for the above-mentioned outlets of the gas mixture.