RU2720429C1 - Hydropneumatic station for hydraulic testing and pressure testing of blowout preventer equipment - Google Patents

Abstract

FIELD: oil, gas and coke-chemical industries.

SUBSTANCE: invention relates to oil and gas industry, to devices for hydraulic testing and pressure testing of blowout equipment. Hydropneumatic station includes a hydraulic circuit for testing preventer hydraulic drives, comprising a tank intended for filling with working fluid, hydropneumatic pump connected to tank and connected to air preparation unit, pressure test pipeline intended for supply of working fluid to hydraulic actuators of preventer connected with hydropneumatic pump connected to pressure test pipeline: manometer, pneumatic hydraulic accumulator, two-section hydraulic distributors; outputs with quick-disconnect connection, connected to hydraulic distributors; pressure testing pipeline is equipped with ball valve to shut off supply of working liquid to pressure test pipeline and safety valve connected to drain pipeline. Station also includes hydraulic circuit of ultra-high pressure for pressure testing, containing power pressure pipeline, intended for supply of working liquid to hydraulic system of pressure test, connected to pressure test pipeline on section before ball valve, which includes high pressure manometer, high-pressure shutoff valves, safety valve connected to drain pipeline, high pressure outlet. Station also includes: an air preparation unit comprising a compressed air source, a pressure regulator, an air manometer; control panel, on which working fluid flow control elements and working fluid parameters monitoring elements are installed for control of preventer hydraulic and pressure hydraulic actuators, including handles of hydraulic distributor, shut-off valves, pressure control handles, pressure gauges.

EFFECT: technical result consists in enabling to pressurize the housing and performance test of hydraulic drives of blowout equipment by separate supply of working fluid for checking strength and tightness of housing and working fluid for checking operability and tightness of hydraulic drives.

3 cl, 2 dwg

Description

The field of technology.

The technical solution relates to the oil and gas industry, namely, devices for hydraulic testing and crimping blowout equipment equipped with hydraulic drives of the working bodies, in order to check for strength, tightness and performance.

The prior art.

Blowout control equipment is designed to seal the mouth of oil and gas wells, to prevent inadvertent releases of fluid into the environment. In order to ensure operational efficiency and reliability, blowout control equipment is subjected to hydraulic tests and pressure testing, both during production, in the factory, before installation at the mouth, and periodically during operation, to confirm reliability and performance in the field. Equipment operating under the pressure of the downhole medium (various types of preventers, transitional coils, crosspieces, fountain fittings, pipe heads, etc.) must be subjected to hydraulic tests for strength (pressure testing), drive operability and tightness before installation with excess pressure of the working fluid. The strength of the body parts of blowout control equipment that senses the pressure of the borehole medium should ensure the possibility of crimping them with test pressure that is a multiple of the operating pressure. At this pressure, blowout control equipment equipped with hydraulic drives of the working bodies must ensure tightness and operability; therefore, hydraulic drives are also tested. For testing there are testing stations or stands for blowout control equipment designed to carry out work to assess the technical condition of equipment, assess buildings for strength, shutters of working bodies for tightness.

A well-known bench for testing oil and gas and blowout equipment for tightness and strength (source [1], patent RU 61 778). The stand contains a base fixed to the base of the lower flange, which serves to install the test object on it and has a channel for supplying water to the cavity of the test object and a channel for draining water from these cavities, and an upper flange that serves to install it on the second flange that is fastened to it the test object. It contains a hydraulic system for supplying water to the test object, including a pump station and a high pressure hose for supplying water from the pump station to the bottom flange of the stand. The pump station comprises a water tank and a hand pump with a suction hose lowered into the tank. A pressure gauge, a pressure fitting, to which a high pressure hose is connected, and a drain fitting are installed on the high-pressure chamber of the pump. A tap is attached to the drain fitting to which a drain hose connected to the tank is connected. The stand is equipped with a fence.

The stand [1] does not allow testing the shutoff bodies of blowout equipment, hydraulic drives of preventer dies or slide plates. The hydraulic line is intended only for crimping the housings and does not allow to supply the working fluid to the hydraulic drives of the working bodies (ram valves, slide plates, etc.). The stand does not allow testing of hydraulic drives in order to fully verify the operability of a dual hydraulic preventer. The hydraulic system with a manual pump has low productivity and high labor costs for operation.

The known hydraulic system of the test bench for the strength of pipe fittings (source [2], patent RU 2228466). The station contains two hydraulic circuits, a working fluid circuit for control and a test fluid circuit for filling the cavities of the tested fittings. The working fluid circuit contains an electric motor, pump, pressure and drain lines connected to the clamp hydraulic cylinder and clamp hydraulic cylinders of the valve flanges through the first and second hydraulic distributors of the working fluid (oil) supply, an adjustable safety valve between the pressure and drain lines, check valves at the inlet to the first and the second directional control valves, pressure recorders, tank and filter, the third and fourth directional valves, hydraulically connected to the control cylinder, the first and second hydraulic distributors. The test fluid circuit contains a test fluid (water) supply cylinder (connected to the control hydraulic cylinder), the piston cavity of which is connected through check valves and valves to the test fluid (water) source and to the valve inlet, as well as an adjustable safety valve between the second pressure and drain highways and a valve between pressure lines. The positive effect of the invention is manifested in increasing the efficiency and productivity of work by creating the pressure of the test fluid (water) supplied to the internal cavity of the valve with a limited volume to increase the safety of maintenance personnel using a control hydraulic cylinder operating on another fluid (oil).

Station [2] allows only pressure testing of valves, but does not allow the performance of the working bodies of valves at nominal and increased pressure of the working medium. It does not allow testing of hydraulic drives in order to fully verify the performance of a hydraulic preventer. The hydraulic system requires connection to a source of electricity and the design of the station involves the implementation of electrical circuits, which complicates the design and increases the likelihood of malfunctions.

A known test bench for industrial pipe fittings (source [3], patent RU 2159419). It contains a base on which tables, a column, hydraulic cylinders for clamping valves are installed, a low-pressure and high-capacity pump, which quickly fills the free volume of the tested product and the entire hydraulic system of the working fluid, a high-pressure and low-capacity pump to create pressure in the pneumatic accumulators, which is necessary for clamping the lower and upper flanges of the valve, as well as their testing. The control panel is equipped with the necessary electrical equipment. When testing cases, fittings, the test product is installed on the table, the lower flange is clamped using the hydraulic cylinder rod. After reaching the preset pressures, the pumps are switched off and throughout the entire test period the clamping pressure of the flanges and the test pressure of the valve are ensured by pneumatic accumulators. After testing the case, closing the valve of the installed valves, test its locking device.

Stand [3] does not allow testing the shutoff bodies of blowout equipment. The hydraulic line does not allow to supply the working fluid to the hydraulic drives of the working bodies (ram valves, slide plates, etc.). The stand does not allow testing of hydraulic drives in order to fully verify the performance of a hydraulic preventer. Pumps require the connection of electric lines, the control panel is equipped with the necessary electrical equipment, which leads to the complexity of the control system and increases the likelihood of malfunctions and failures of the stand [3].

A known stand for crimping gas and oilfield equipment (source [4], patent RU 2190081). The crimping stand contains a hydraulic pump, a pressure head hydraulic line, a safety valve, two manual control valves, two pressure valves, two hydraulic locks and a mechanized joint assembly between the flanges. The pressure of the working fluid in the pressure lines of the hydraulic system is controlled by five pressure gauges. The mechanized sealing assembly comprises a transition coil, to which a blind flange is attached to the lower flange, and a docking flange is screwed onto the upper part with a threaded rectangular profile. The working fluid from the pump is pressurized into the cavity of the mechanized sealing unit through a fitting. In the upper part of the plunger there is an opening for air exhaust, drowned out by a stopper.

The stand [4] does not allow testing the performance of hydraulic drives of hydraulic preventers, including dual preventers. The stand allows only pressure testing of cases, but does not provide the opportunity to test hydraulic drives at nominal and increased pressure of the working medium in order to fully check the performance of the preventer in conditions close to operational and extreme.

Thus, from the prior art it follows that existing technical solutions do not allow a full technical assessment of the performance, reliability and safety of blowout equipment equipped with hydraulic actuators of shut-off working bodies, in particular dual hydraulic preventers. The functionality of well-known stations does not allow full-scale testing of blowout control equipment equipped with hydraulic actuators of shut-off working bodies.

The claimed technical solution is aimed at improving the design of stations for hydraulic testing of hydraulic drives and crimping blowout control equipment.

The technical result consists in providing the opportunity to pressure test the casing and test the operability of the hydraulic drives of blowout control equipment by separately supplying the working fluid to check the strength and tightness of the casing and the working fluid to check the operability and tightness of the hydraulic drives. It is possible to control the supply of working fluid with the given parameters to the hydraulic actuators of the preventer in combination with the ability to supply the working fluid with the given parameters for crimping the casing of the preventer.

The technical result is achieved by the fact that the hydropneumatic station for hydraulic testing and crimping blowout control equipment includes:

- a hydraulic circuit for testing preventer hydraulic drives, containing a tank designed to be filled with a working fluid, a hydropneumatic pump connected to the tank and connected to an air preparation unit, a pressure test pipe designed to supply working fluid to the preventer hydraulic drives connected to a hydropneumatic pump, connected to pressure test pipe pressure gauge, pneumatic accumulator, two-section valves; exits with a quick disconnect connection connected to hydrodistributors; the pressure test pipe is equipped with a ball valve to shut off the flow of working fluid into the pressure test pipe, and a safety valve associated with the drain pipe;

- an ultra-high pressure hydraulic circuit for crimping containing a pressure test pipe, designed to supply a working fluid to the pressure test hydraulic system, connected to a pressure test pipe, to a section in front of a ball valve, including a high pressure gauge, high pressure shut-off valves, and a safety valve connected to the drain pipe high pressure outlet;

- air preparation unit containing a source of compressed air, pressure regulator, air pressure gauge;

- a control panel on which the working fluid flow control elements and control elements of the working fluid parameters are mounted for controlling the hydraulic actuators of the preventer and pressure testing, including the valves of the valve, the handle of the shutoff valve, pressure regulator, pressure gauges.

The hydropneumatic pump is provided with a working pressure of up to 80 MPa. The hydraulic circuit for testing preventer hydraulic drives is made with a working fluid pressure of up to 25 MPa. The ultra-high pressure hydraulic circuit for crimping for the preventer housing is made with a working fluid working pressure of up to 70 MPa. The station is made in the form of a cabinet with a door, on the upper wall of which a control panel is mounted.

The technical solution can be implemented in various versions that differ in technical characteristics (system pressure, pump capacity, tank volume, pneumatic accumulator volume, etc.).

The technical solution is illustrated by graphic materials, which depict:

FIG. 1 - hydropneumatic station diagram;

FIG. 2 - photo of the control panel of the station.

On graphic materials indicated:

Block A - Air preparation unit including:

K is the source of compressed air;

1- ball valve;

2 - air filter;

3- pressure regulator;

4- air pressure gauge;

5- ball valve;

Block B - Hydraulic circuit for testing preventer hydraulic drives:

6- tank with a working fluid;

7-ball ball valve ½;

8-filter oil ½;

9-pump hydropneumatic 80: 1;

10-safety valve;

11-valve shut-off 25 MPa;

12 - exits with quick disconnect connection;

13-manometer at 25MPa;

14-section hydraulic control valve;

15- ball valve 25 MPa;

16-pneumohydroaccumulator;

17-pressure test pipeline;

18- drainage pipeline;

19-directional control valve;

Block В - hydraulic circuit of ultrahigh pressure for crimping including:

20-safety valve;

21-valve shut-off valve at 70 MPa;

22 high-pressure outlet 70 MPa;

23-manometer high pressure at 100 MPa;

24-ball high-pressure ball valve 100 MPa;

25-pressure crimping pipeline;

26- drainage pipeline;

27-control panel;

28-container

29-arm stop valves;

30-knob pressure regulator.

Implementation of a technical solution.

Hydropneumatic station for hydraulic testing and pressure testing of blowout equipment (hereinafter referred to as the "station"). The station contains an air preparation unit (Block A of FIG. 1), a hydraulic circuit for testing preventer hydraulic drives (block B of FIG. 1), an ultra-high pressure hydraulic circuit for crimping (block B of FIG. 1). The ultra-high pressure hydraulic circuit for crimping (block B) is made with an adjustable range of working fluid pressure from 0 to 70 MPa. The hydraulic circuit for testing preventer hydraulic actuators (block B) contains a 4-line hydraulic system for simultaneous testing of 4 hydraulic actuators in order to fully check the operability of a dual preventer. The hydraulic circuit for testing preventer hydraulic drives (block B) has an adjustable working fluid working pressure range of up to 25 MPa. The hydraulic circuit for testing preventer hydraulic drives (block B) contains four high-pressure hoses 5 meters long for connecting to hydraulic drives connected to outputs 12. The station operates from a compressed air source K (Fig. 1) with a pressure of 0.4 to 1.2 MPa

The station consists of two connected hydraulic systems: a hydraulic circuit for testing preventer hydraulic drives (block B of FIG. 1), an ultra-high pressure hydraulic circuit for crimping (block C of FIG. 1), receiving energy from the hydraulic fluid from the hydropneumatic pump 9 (FIG. 1) and pneumatic accumulator 16 (figure 1). The ultra-high pressure hydraulic circuit for crimping allows you to crimp the casing of the preventer, as well as the casing of other wellhead equipment.

The air preparation unit (block A) contains a source of compressed air K (Fig. 1), a ball valve 1 (Fig. 1) for blocking the pneumatic line from a source of compressed air K, an air filter 2 (Fig. 1), a pressure regulator 3 (Fig. 1), the pressure gauge 4 (Fig. 1) is air, a ball valve 5 (Fig. 1) for closing the pneumatic line to the hydropneumatic pump 9.

The hydraulic circuit for testing preventer hydraulic drives (block B), contains: tank 6 (Fig. 1), designed to be filled with a working fluid (for example, VMGZ oil), a hydropneumatic pump 9 connected to tank 6 and connected to the air preparation block (block A) , pressure test pipe 17 (figure 1), designed to supply working fluid to the hydraulic actuator of the preventer, connected to the hydropneumatic pump 9; connected to the pressure test pipe 17: pressure gauge 13 (figure 1; 2), pneumatic accumulator 16, two sectional control valves 14 (figure 1); outputs with a quick connection 12 (figure 1) connected to the control valves 14; the pressure test pipe 17 is equipped with a ball valve 15 (FIG. 1) to shut off the supply of the working fluid to the pressure test pipe 17 and a safety valve 10 (FIG. 1) connected to the drain pipe 18 (FIG. 1). In front of the hydropneumatic pump 9, a ball valve 7 (Fig. 1) is installed to shut off the supply line of the working fluid from the tank 6, an oil filter 8 (Fig. 1) for cleaning the working fluid. Pressure test pipe 17 is connected to the drain pipe 18 through the shut-off valve 11 (figure 1).

The ultra-high pressure hydraulic circuit for crimping (block B) contains: a pressure crimping pipe 25 (Fig. 1), designed to supply a working fluid to the crimping hydraulic system, connected to a pressure test pipe 17, to a section in front of the ball valve 15. Pressure crimping pipe 25 includes pressure gauge 23 (FIG. 1), high pressure shutoff valves (shutoff valve 21 (FIG. 1), ball valve 24 (FIG. 1)), safety valve 20 (FIG. 1), connected to the drain pipe 26 (FIG. .1), exit 22 (FIG. .1) high pressure;

Hydropneumatic pump 9, pneumatic accumulator 16 and hydraulic tank 6 are placed in a compact metal container 28 (figure 2), on the top cover of which is located the control panel 27 (figure 2). On the control panel 27 mounted controls the flow of the working fluid and control elements of the parameters of the working fluid for controlling the hydraulic actuators of the preventer and pressure testing, including the handle 19 of the control valves, the handle 29 of the shutoff valve (shut-off valve 11, ball valve 15, shut-off valve 21, ball valve 24), handle 30 of the pressure regulator, pressure gauges 4,13,23.

Hydropneumatic pump is made with a working pressure of up to 80 MPa. The hydraulic circuit for testing preventer hydraulic drives is made with a working fluid pressure of up to 25 MPa. The ultra-high pressure hydraulic circuit for crimping for the preventer housing is made with a working fluid working pressure of up to 70 MPa. The station is made in the form of a container 28 with a door, on the upper wall of which a control panel 27 is mounted.

Description of work.

Preparing for work. Tank 6 is filled with a working fluid - VMGZ oil. Before starting, the station is connected to a compressed air source K, for example, an air compressor or to a stationary factory line of compressed air, the ball valve 1 is opened. High pressure hoses (RVD) are connected via a quick disconnect to the outputs 12 and to the preventer hydraulic drives in accordance with the marking on the RVD: opening deaf dies, closing deaf dies; opening pipe dies, closing pipe dies. Connect the 70 MPa high pressure hoses for pressure testing, to output 22 and to the flange of the test bench.

Control and management bodies for controlling the flow of the working fluid and control elements for the parameters of the working fluid for controlling the hydraulic actuators of the preventer and pressure testing, including the handles 19 of the control valves, the handles 29 of the shutoff valves (shut-off valve 11, ball valve 15, shut-off valve 21, ball valve 24), handle 30 pressure regulators, pressure gauges 4,13,23 are located on the control panel 27.

The operating procedure of the station for testing hydraulic drives.

Fill the hydraulic tank 6 with hydraulic oil (VMGZ). Open the ball valve 7 to supply the working fluid from the tank 6 through the oil filter 8 to the hydropneumatic pump 9. Open the ball valve 1 for supplying compressed air to the air preparation unit (block A) with filter 2. Close the high-pressure ball valve 24, open the ball valve 15 for supplying the working fluid to the pressure test pipe 17. Open the ball valve 5 for supplying compressed air from the air preparation unit (block A) to the hydropneumatic pump 9. After the supply of compressed air starts, hydropneumatic starts automatically atic pump 9. Close the shut-off valve 11 and charge the pneumatic accumulator 16 with the working fluid 16. Charging the pneumatic accumulator 16 with a capacity of 20 l is necessary for the quick operation of the preventer hydraulic actuators. To set the required pressure of the working fluid, the pressure of the compressed air supply is adjusted by the pressure regulator 3 for the handle 30, the air pressure is controlled by the pressure gauge 4, the pressure of the working fluid in the pressure test pipe 17 is determined by the pressure gauge 13. To set the working fluid pressure of 21 MPa, set the value compressed air pressure equal to 0.27 MPa (conversion coefficient in the hydropneumatic pump 9 is 80: 1).

After setting a predetermined working pressure by gauge 13, the station is considered ready for testing hydraulic drives.

To open the blind plates of the preventer, the lower handle 19 of the control valve 14 is moved to the “DEAF OPEN” position, after which visual inspection of the opening of the blind plates on the preventer is carried out and the working pressure is set on the pressure gauge 13.

To close the blind dice of the preventer, the lower handle 19 of the control valve pos. 14 are transferred to the “DEAF CLOSED” position, after which they carry out visual inspection of the closing of the blank dies on the preventer and wait for the working pressure to be set on the pressure gauge 13.

Similarly, to open the tube preventer dies, the upper handle 19 of the control valve 14 is moved to the "TUBE OPEN" position, after which visual inspection of the opening of the tube dies on the preventer is carried out and the working pressure is set on the pressure gauge 13.

To close the tube preventer dies, the upper handle 19 of the control valve 14 must be moved to the "TUBE CLOSED" position, after which visual closure of the tube dies on the preventer is carried out and the working pressure is set on the pressure gauge 13.

Protection against exceeding the working pressure in the hydraulic control system (and, accordingly, in the preventer hydraulic drives) is carried out by the safety valve 10, adjustable for the set value. When the preventer hydraulic drives are working, the working fluid is drained through the drain line 26 into the hydraulic tank 6. After testing the hydraulic actuators, the valve is opened to relieve pressure shut-off 11. Close the ball valve 5 to turn off the hydropneumatic pump 9. For a complete pressure relief in the hydraulic actuators of the preventer it is necessary (p With the shut-off valve open 11) move the handles 19 of the control valve 14 in turn to all operating positions.

This provides a test of the operability and reliability of blowout control hydraulic drives. It is possible to control the supply of working fluid with the given parameters to the hydraulic actuators of the preventer.

The operation of the station for crimping high pressure.

Install and fix the preventer on the flange of the test bench. Fill the preventer with water and plug the upper flange of the preventer with a test plug with a sealing flange gasket. Connect the 70MPa high pressure hoses to output 22 and to the flange of the test bench. Fill the tank 6 with a working fluid (hydraulic oil VMGZ). Open the ball valve 7 to supply the working fluid from the tank 6 through the filter 8 to the hydropneumatic pump 9. Open the ball valve 1 for supplying compressed air to the air preparation unit (block A) with filter 2. Close the ball valve 15, open the high-pressure ball valve 24 and open the ball valve 5 for supplying compressed air to the hydropneumatic pump 9. After the supply of compressed air starts, the hydropneumatic pump 9 starts automatically. Close the shut-off valve 21.

To set the required pressure of the working fluid, the compressed air supply pressure is adjusted by the pressure regulator 3 for the handle 30, the air pressure is controlled by the manometer 4, the high pressure of the working fluid in the pressure test pipeline 25 is controlled by the manometer 23. To supply the working fluid with a pressure of up to 70 MPa set the pressure value of compressed air to 0.9 MPa (conversion coefficient in the hydropneumatic pump 9 ultrahigh pressure 80: 1).

The pressure regulator 3 smoothly raises the pressure in increments of 5 ... 10 MPa in accordance with the instructions disclosed in the test and pressure testing technique of the preventer.

Upon reaching the required value of the test pressure, close the ball valve 24. After crimping the preventer to release pressure, open the shut-off valve 21. Close the ball valve 5 to turn off the hydropneumatic pump 9. Open the high-pressure ball valve 24 to relieve the residual pressure of the working fluid in the hydropneumatic pump 9.

Thus, they provide pressure testing of the body by supplying a working fluid to check the strength and tightness. It is possible to control the flow of working fluid with the specified parameters for crimping.

The claimed technical solution is implemented in LLC TYUMENEFTEOBORUDOVANIE Tyumen and LLC PIK NEFT Tyumen using industrially produced devices and materials, its elements can be manufactured and assembled at modern industrial enterprises. The station is applicable for the specified purpose and provides the claimed technical result.

Claims (7)

1. Hydropneumatic station for hydraulic testing and crimping blowout control equipment, characterized in that it includes: a hydraulic circuit for testing preventer hydraulic drives, containing a tank designed to be filled with a working fluid, a hydropneumatic pump connected to the tank and connected to an air preparation unit, a pressure test pipe designed to supply working fluid to the preventer hydraulic drives connected to a hydropneumatic pump, connected to a pressure head test pipeline: pressure gauge, pneumatic accumulator, two-section hydraulic valves; exits with a quick disconnect connection connected to hydrodistributors; the pressure test pipe is equipped with a ball valve to shut off the supply of working fluid to the pressure test pipe and a safety valve associated with the drain pipe; an ultra-high pressure hydraulic circuit for crimping, comprising a pressure test line for supplying a working fluid to the pressure testing system, connected to a pressure test pipe to a section in front of the ball valve, including a high pressure gauge, high pressure shut-off valves, and a safety valve connected to the drain pipe, high pressure outlet; an air preparation unit comprising a source of compressed air, a pressure regulator, an air pressure gauge; a control panel on which controls for the flow of working fluid and control elements of the parameters of the working fluid for controlling the hydraulic actuators of the preventer and crimping, including the handle of the valve, the handle of the shut-off valve, pressure regulator, pressure gauges, are mounted. 2. Hydropneumatic station according to claim 1, characterized in that the hydropneumatic pump is made with a working pressure of up to 80 MPa, the hydraulic circuit for testing hydraulic actuators of the preventer is made with a working pressure of the working fluid up to 25 MPa, the hydraulic circuit for ultra-high pressure for crimping the housing of the preventer is made with a working working fluid pressure up to 70 MPa. 3. Hydropneumatic station according to claim 1, characterized in that it is made in the form of a cabinet with a door, on the upper wall of which a control panel is mounted.

Images