RU2763873C1 - Method for upgrading multipass borehole switches and set of products for implementation thereof - Google Patents

Abstract

FIELD: petroleum industry.

SUBSTANCE: invention relates to the field of petroleum production and can be used to improve the process of switching the direction from producing boreholes to an apparatus for measuring the flow rate of boreholes. Method for upgrading multipass borehole switches (MBS) includes a body with holes for connecting working fluid supply branch pipes, a hydraulic or electric drive that intended for alternately switching the measurement channel to the working fluid branch pipes, wherein other connections are in communicated with the common output to the collector, wherein a set of products intended for upgrading MBS is installed on the existing MBS, characterised by the fact that: a measurement channel is made in the form of an angle bar connected with the hollow shaft, and a mobile carriage blocked from rotation around its own axis by a dowel; the carriage is secured by means of rollers and a spring, abutting against the surface of the body opposite the inlet branch pipe; the system for monitoring the working fluid leakage from the measurement channel into the common collector is made through seals of the valve (carriage); a signal about a leak of the valve is transmitted to the mechanical or electromechanical pressure drop sensor via a system of channels in the valve (carriage), the angle bar, on the shaft, in the cover, and then directed through pulse tubes (the signal on the pressure drop is then transmitted from the sensor to the measurement and information processing unit); the minimum amount of sensors is one, but in order to increase the reliability, an unlimited amount of backup sensors can be used; the amount of valve seals is at least two, wherein one should be made soft, made of polymer materials, the other one should be made of more solid materials; the second seal is pressed by means of a separate wave spring. A set of products intended for upgrading MBS, containing a carriage, springs, an angle bar, a shaft, a cover, pulse tubes, and a pressure drop sensor, installation thereof in accordance with the proposed method allows for an upgrade in the previously manufactured MBS with a structure without a leakage control system.

EFFECT: increase in the reliability of operation of the MBS and improvement in the monitoring of the tightness of the seal of the carriage thereof.

4 cl, 1 dwg

Description

The invention relates to the field of oil production and can be used to improve the process of switching the direction of oil from pipelines carrying oil from producing wells to a device that measures the flow rate of wells.

Known multi-way well switch [RU 83551, IPC F04B 47/04, publ. 06/10/2009], containing a body with holes for connecting pipes supplying the working fluid, a hydraulic distributor for connecting the measurement channel to the pipes for supplying the working fluid, a sleeve installed in the body with holes corresponding to the holes in the body, a measurement channel made in the form of an angle with a movable carriage, connected to a hollow shaft that supplies the working fluid to the measuring nozzle. The hydraulic distributor of the device is made in the form of a housing in which a spring-loaded piston is installed, connected to a toothed rack interacting with a gear kinematically connected to the divider gear.

The main disadvantage (known from the experience of using the device) of the known device is its frequent jamming during operation directly when switching wells. This happens due to wear of the rollers of the carriage and guide grooves of the body. Due to the formation of wear, the carriage rotates around its axis, wedges and does not provide a secure fit, tightness of the seal. Seal leakage is not determined promptly in any way, it can only be determined by the method of comparative measurements of well flow rates carried out along the bypass, bypassing the PSM, requiring the presence of maintenance personnel directly at the facility where the PSM is operated. An additional disadvantage is the premature wear of the rubber seal of the carriage, which occurs due to the sticking of mechanical impurities on the sealed surfaces of the body.

Also known multi-way switching locking device [RU 2158868, IPC F16K 11/087, publ. 11/10/2000], designed to switch the direction of oil movement from pipelines carrying oil from production wells to a device that measures the flow rate of wells. The locking device contains an annular body. The housing has radial inlets and is closed from the ends with covers. Inside the housing there is a locking body with an outer spherical surface and a discharge channel. The locking body is controlled by a shaft. The shaft is coaxially installed in the channel of the top cover. The outlet channel communicates with the outlet pipe. The locking element is made in the form of a truncated ball with the number of inlet channels less by 1 than the number of inlet openings of the body. Seals are installed in the inlet openings of the body. They are spring-loaded relative to the flanges attached to the body and interact with the outer surface of the locking element. The inner cavity of the shaft is connected on one side with the outlet channel of the locking element, on the other hand, through radial holes with the cavity of the outlet pipe.

The disadvantages of the known device are: the material consumption of the structure, the large dimensions of the body that occur when using the configuration for 14 outlets, the rapid wear of the shut-off element due to constant contact with a variety of seals, as well as sticking in a statically preloaded state of spring-loaded sealing seats, as a result of which their tightness is violated. wear of the seals.

The technical result to be achieved by the use of the claimed invention is to improve the consumer properties of the multi-way well switch (PSM) by increasing the reliability of its operation and improving the control of the tightness of the seal of its carriage.

This goal is achieved by supplying the claimed invention with a set of the following characteristics.

1. The method is implemented by installing a PSM upgrade kit on an existing PSM, consisting of a carriage, springs, an elbow, a shaft, a cover, impulse pipes and a differential pressure sensor, and allows you to upgrade previously manufactured PSM having a design that does not have a leakage control system.

2. In the form of a square connected to a hollow shaft, as well as to a movable carriage fixed from rotation around its own axis with a key, a measuring channel is made. The carriage is fixed with the help of rollers and a spring, adjacent to the surface of the body opposite the inlet pipe.

3. The system for monitoring the leakage of the working medium from the measurement channel into the common manifold is carried out through the seals of the carriage.

4. The valve leakage signal is transmitted to a mechanical or electromechanical differential pressure sensor through a system of channels in the carriage, in the elbow, on the shaft, in the cover, and then sent through the impulse tubes. After that, a signal about the presence of a pressure drop is transmitted from the sensor to the block for measuring and processing information.

5. The minimum number of sensors is one, but redundant sensors can be used in an unlimited number to increase reliability.

6. The number of valve seals is at least two, while one must be soft (made of polymeric materials), the second must be made of harder materials (metal or others). The second seal is pressed by a separate wave spring.

When testing the tightness of the carriage, no personnel is required in the area of operation of the PSM. Diagnostics of the PSM operation can be carried out remotely (using the telemechanics system).

According to the results of testing the tightness of the carriage, it is possible to judge the reliability of the measurement of the well flow rate, and at the same time not to resort to manual comparative measurements performed by bypass (bypassing the PSM).

The metal seal additionally acts as a scraper, eliminating salt deposits and other mechanical impurities.

The magnitude of the pressure drop that occurs when the valve seal is leaking makes it possible to predict the need for maintenance, which is aimed at preventing the destruction of the body and the sealing surface of the carriage in advance.

Comparison of PSM equipped with the claimed solution, with the above devices, as well as other technical solutions in this area, made it possible to identify features that distinguish the result of applying the proposed solution from the results and features of the operation of non-modernized PSM, which allows us to conclude that the proposed solution meets the criterion of patentability "novelty".

A comparative analysis of the results of applying the claimed invention with the characteristics of known devices shows that the claimed invention increases the adaptability of the PSM to operating conditions and improves the consumer properties of products made using the claimed invention. Thus, the claimed invention meets the patentability criteria "industrial applicability" and "inventive step".

The design of the PSM, equipped with the claimed invention, is shown in Fig. 1, where: body 1, cover 2, dividing mechanism with electrohydraulic drive 3, square 4, carriage 5, shaft 6, positive impulse tube 7, negative impulse tube 8, differential pressure sensor 9, key 10, polymer seal 11, metal seal 12, wave spring 13-14, roller 15, measuring channel 16, inlet pipe 17, common manifold 18. As a device upgraded with the claimed invention and displayed as such in the figure, a multi-way well switch described in invention No. 2529270 was used. [RU 2529270, IPC F16K 11/085, publ. September 27, 2014].

The invention is functionally implemented and operates as follows.

In the body 1 (on the inner cylindrical surface, below and above the inlet holes) there are two diametrical grooves with recesses designed to fix the carriage 5 opposite each hole. The rollers 15 of the movable carriage 5 move along the grooves. The depth of the grooves and recesses is chosen in such a way that when the rollers move along the groove, a gap is formed between the seal 11 and the wall of the housing 1, and when the rollers enter the recesses, the seal is pressed against the housing by the spring 13, as well as the metal seal 12 is pressed against the body 1 by the spring 14, ensuring tightness in the measuring line. The dividing mechanism with an electrohydraulic drive 3 serves to ensure the switching of the carriage 5 between the taps of the housing 1. After turning on the power supply, the electric hydraulic actuator 3 transmits rotation through the key to the shaft 6, the shaft transmits rotation to the square 4 and the carriage 5. The carriage 5, under the action of the spring 13, is pressed against the wall of the housing 1, but at the same time, it is fixed from rotation around its axis with the key 10 and ensures the straightness of the rolling of the rollers 15 (along the grooves of the body 1), as a result of which it turns at a certain angle and connects to the corresponding channel. During the supply of liquid in the measuring channel 16, as well as in the internal cavity of the carriage, shaft and square, pressure is formed, the force of which exceeds the pressure force of the liquid located in the common cavity of the housing 1. force) from leakage, but in the event of a rupture or improper fit of the seal 11, the pressure fluid enters a special channel between the seals 11 and 12 and then through the positive impulse tube 7 enters the sensor 9, which in turn registers the difference between the fluid pressure forces on the tube walls 7 and 8 and informs the user about the leakage of the carriage seal 5.

Thus, as a result of the application of the claimed invention, the reliability of the upgraded PSM is increased, for which the function of controlling the tightness of the seal of their movable carriages is improved.

Claims (4)

1. A method for upgrading multi-way well switches (PSM), containing a body with holes for connecting the working fluid supply pipes, a hydraulic drive or an electromechanical drive designed to alternately switch the measurement channel to the working fluid supply pipes, while the remaining pipes communicate with a common outlet to the manifold, and a measuring channel, a carriage fixed from rotation around its own axis opposite the opening of the inlet pipe, during which a set of products is installed on the existing PSM, designed to modernize the PSM, characterized in that the measurement channel is made in the form of an angle connected to a hollow shaft, and also with a movable carriage, fixed from rotation around its own axis with a key with contact with the surface of the body opposite the opening of the inlet pipe, the carriage is fixed with the help of rollers and a spring, and when the rollers move, the soft seal of the carriage is pressed against the body; form a system for monitoring the leakage of the working medium from the measuring channel into the common manifold and through the carriage seal, installing a second seal made of a harder material, which is pressed with a separate wave spring to form a channel between the two seals, communicated through the positive impulse tube with at least one sensor differential pressure, which is also connected to the negative impulse tube, with the possibility of transmitting a signal about the leakage of the carriage to the differential pressure sensor through the system of channels in the carriage, elbow, hollow shaft, cover and further through the impulse tubes, then the signal about the presence of a differential pressure is transmitted from the sensor to block of measurement and information processing. 2. The method according to claim 1, characterized in that a polymeric material is used as a soft seal material, and a metal or other hard material is used as a harder seal material. 3. The method according to claim 1, characterized in that the differential pressure sensor is mechanical or electrical. 4. A set of products intended for the implementation of the modernization of the PSM in accordance with the method according to claim 1, containing the carriage, springs, square, hollow shaft, cover, seals, impulse pipes and a differential pressure sensor.

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