RU2505729C2 - Multi-stream switching manifold - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: housing of multi-stream switching manifold (hereinafter referred to as MSSM) has several inlet fittings and one common outlet fitting. MSSM housing has channels from each inlet fitting up to inner surface of the flat bottom area where replacement part for protection of the housing can be installed while repair can be made by replacement of this part without disassembly. At the top the housing is covered by the lid with tube for connection to measurement device. Product from one well comes through channel in MSSM housing to hollow rotable selector, then through hollow shaft to lid cavity and through tube in the lid it is delivered for measurement. Fittings of remaining wells are communicated with common outlet of the housing.

EFFECT: higher reliability of operation.

5 cl, 1 dwg

Description

FIELD OF TECHNOLOGY

The invention relates to flow distribution devices in pipeline systems and can be used mainly as a switch wells in group metering installations of oil production facilities.

BACKGROUND

The process of measuring production rates of a group of producing wells is widely known. As a rule, pipelines are laid from each of several production wells to a group metering unit (hereinafter GZU). Inside the gas storage unit, these pipelines are connected to a multi-way well switch (hereinafter PSM), from which the products of one of the wells are directed to the metering device, and the products of the remaining wells are sent to a common oil recovery pipeline.

Well production is, as a rule, a multicomponent medium consisting of hydrocarbons (including asphaltenes, resins, paraffins, etc.), formation, highly mineralized salts (up to 45 g / l or more) water, associated gas (free and dissolved), mechanical impurities in the form of rock particles, corrosion products and wear of downhole equipment.

Well-known PSM produced by industry (for example, JSC AK OZNA Oktyabrsky, Bashkortostan, hereinafter PSM1), and used on the vast majority of domestic production facilities. In the hollow housing PSM1 there is a rotary locking and switching body made in the form of a square. A spring-loaded carriage is installed on the lateral nozzle of the square, having two rollers and a rubber seal between the carriage and PSM1 body to direct the production of the measured well to the square. The upper nozzle of the square is connected to the hollow shaft, through which the production of one well is directed to the metering device. Coaxial to the upper nozzle in the lower part of the square made a cylindrical protrusion-axis, inserted into a recess in the lower part of the housing PSM1. To switch the flow rate measurements from one well to another, the shaft with the square is rotated by a certain angle, while the carriage rollers roll along the grooves of variable depth made on the inner cylindrical surface of the PSM1 casing. The depth of the grooves is chosen so that when the rollers move along the grooves, a gap is formed between the rubber seal of the carriage and the PSM1 body, but when the square is opposite the nozzle of the measured well, the rollers sit in the recess and the carriage seal is pressed against the PSM1 body.

The solution implemented in PSM1 has a number of significant drawbacks, the main ones of which are: a) low reliability of the rubber seal between the carriage and the inner cylindrical surface of the PSM1 housing due to the shape of the sealing surfaces, which leads to accelerated corrosion and erosion wear of the PSM1 housing section under the seal and guide grooves ; b) during the movement of the rollers pressed by the spring along the bottom of the guide grooves, wear and increase in the depth of the grooves occurs, which leads to insufficient carriage lift when moving the elbow between the well nozzles and, as a result, damage to the seal and the surface of the PSM1 casing; c) there is a significant gap between the axis of the square and the recess in the housing ПСМ1, which increases with wear and does not compensate for anything. The amount of this gap under the action of the carriage spring skews the square, which leads to uneven pressing of the seal to the housing PSM1, accelerated wear of the sections of the housing PSM1 under the lower part of the seal and the lower guide groove; d) the fragility of the housing PSM1; d) the high complexity and cost of repairing the PSM1 building, low maintainability.

All of these shortcomings adversely affect the accuracy and regularity of measuring production wells production rates, which are prescribed by federal regulatory documents.

It is known that there are versions of the PSM1 case made of high alloy steels (for example, 12X18H10T, then PSM2), and there is also a version with a cylindrical insert made of high alloy steel into the PSM case (utility model RU 83551 U1, January 14, 2009, further PSM3). These implementations, as practice shows, did not give significant improvements to the shortcomings listed for PSM1, because the erosive wear of the PSM case made of high alloy steels has not decreased, the same for wear of the guide grooves.

Also known is a device "MULTI-POSITION SWITCH OF A FLUID" (patent RU 2256836 C2, 09/15/2003, hereinafter MPTS).

The description of the MPTS indicates that the invention is intended to be used primarily as a switch wells in the gas storage facilities of oil production facilities. MPTS is made in the form of a plug valve with a cylindrical plug. The cork is placed in its hollow body. The body is made in the form of a cylinder with end caps. Through one of the covers along the axis of the housing, the shank of the plug is removed for its rotation. The housing is equipped with radial nozzles placed on it in one plane. The cylindrical plug is placed in the housing with the formation on both sides of it, respectively, of two cavities. Each housing cover is equipped with a pipe for communication of each of its two cavities with external devices. In the cylindrical tube, the number of cut-outs is made according to the number of radial nozzles of the housing with each of them reaching one of the ends of the cylindrical tube to provide authorized communication between the radial nozzles and the corresponding body cavity. The cylindrical plug is rigidly positioned from any movement other than rotation by means of axial-radial bearings made in the form of two sliding pairs.

MPTS when implemented in a particular device for PSM has a number of significant drawbacks: a) difficult tasks arise, such as sealing between the housing and the cylindrical tube with cutouts, centering the tube in the housing; b) crevice corrosion, c) the possibility of jamming due to ingress of solids and precipitation of salts; d) high friction in large-diameter plain bearings under conditions of flushing by production wells; e) when turning the plug, in case of stopping it in an unintended position, i.e. when the cutouts in the plug are not opposite the well nozzles, overlapping of the nozzles and an unpredictable increase in pressure are not excluded, which is unacceptable from the point of view of industrial safety; f) the presence of detachable connections at the bottom of the device makes it difficult to maintain and control for leaks; g) the MPTS does not provide for the possibility of positioning the plug during manual switching, as well as the ability to configure the drive, for example when replacing the drive, without disassembling the MPTS.

As a prototype, PSM1 was selected as the closest in design.

SUMMARY OF THE INVENTION

The aim of the invention is to eliminate the disadvantages characteristic of PSM1, increasing the reliability and maintainability of the device, reducing the complexity of its repair.

This goal is achieved by the fact that the multi-way well switch contains a housing with several inlet nozzles and one common outlet nozzle, a cover with a nozzle for connection to a measuring device, a hollow shaft between the cavities of the housing and the cover. In this case, channels are made in the housing from each inlet pipe to the inner surface of the flat bottom section, one of the inlet pipes through the channel in the housing communicates with a hollow rotary selector pressed by a spring to the bottom of the housing and has a tight seal with a flat section of the bottom of the housing, the hollow rotary selector is connected with a hollow shaft, while the remaining inlet nozzles of the housing communicate with the common outlet of the housing. A removable part can be installed inside the bottom of the case to protect the case and the possibility of repair without removing the case by replacing the replacement part. The seal between the selector and the mating part can be performed "metal on metal". The positioning of the selector is carried out by balls on a flat surface with recesses. The spring pressing the selector to the bottom of the housing does not cause the PSM shaft to skew, as located centrally (coaxially to the housing).

BRIEF DESCRIPTION OF THE DRAWING

The drawing shows a multi-way well switch with a cut, where the numbers indicate the main elements of the device:

1 - case with several inlet nozzles and one common outlet nozzle;

2 - a cover with a pipe for connecting to a measuring device;

3 - a hollow shaft between the cavities of the housing and the cover;

4 - hollow rotary selector with seals;

5 - spring; DOC

6 - replacement part.

The arrows indicate the inputs of the wells, the direction of the output for measuring the production of one of the wells and the total output of the remaining wells.

PREFERRED EMBODIMENTS OF THE INVENTION

While maintaining the external dimensions of the PSM as in the prototype, the diameter of the circle of the centers of the openings of the inlet channels decreases. Thus, the present invention is preferably used with a maximum of eight inlets.

INDUSTRIAL APPLICABILITY

Due to the problem of fragility in the domestic oil industry, low maintainability, high labor intensity and the cost of repairs of PSM1 cases, which leads to violations of the accuracy and regularity of measurements of production wells, the technical solution formulated in the present invention will become a real alternative to its implementation.

INFORMATION SOURCES

1. Passport Ha 2.954.008 PS. Multi-directional well switches, OJSC AK OZNA, Oktyabrsky, Bashkortostan, prototype.

2. RF patent for utility model RU 83551 U1, 01/14/2009.

3. RF patent for the invention RU 2256836 C2, 09/15/2003.

Claims (5)

1. A multi-way well switch, comprising a housing with several inlet nozzles and one common outlet nozzle, a cover with a nozzle for connecting to a measuring device, a hollow shaft between the cavities of the housing and the cover, characterized in that the housing has channels from each inlet to the inner surface of a flat bottom section, one of the inlet pipes through a channel in the housing communicates with a hollow rotary selector pressed by a spring to the bottom of the housing and having a tight seal with a flat bottom section to of the housing, the hollow rotary selector is connected to the hollow shaft, while the remaining input branch pipes of the housing communicate with the common output pipe of the housing. 2. The multi-way well switch according to claim 1, characterized in that a replaceable part is installed inside the bottom of the body to protect the body and the possibility of repair without dismantling the body by replacing the replaceable part. 3. The multi-path well switch according to claim 1, characterized in that the seal between the selector and the mating part is made of "metal-to-metal". 4. The multi-path well switch according to claim 1, characterized in that the positioning of the selector is carried out by balls on a flat surface with recesses. 5. The multi-path well switch according to claim 1, characterized in that the spring pressing the selector to the bottom of the housing is centrally located (coaxial to the housing).

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