RU213229U1 - DOUBLE HYDRAULIC RAM PREVENTOR - Google Patents

Abstract

The technical solution relates to equipment for servicing oil and gas wells, to ram preventers equipped with two ram gates designed to hermetically close the well channel. The double hydraulic ram preventer comprises a housing 1 with a vertical through hole 2 and horizontal cylindrical ram cavities 3 and 4, two ram gates 5 and 6 are located in the ram cavities, where each ram is equipped with a movement mechanism in the form of a hydraulic drive 8, containing a housing 9, in which the piston 10 and the pusher 11, connected to the die 7, with the possibility of separation. Moreover, the body of the hydraulic actuator 8 is partially submerged at one end into the groove of the preventer body and is fixed with a union nut 12. The preventer body contains through holes 18 into the upper and lower parts of the ram cavities of the upper and lower ram gates, a plate 13 with bypass valves 15 is installed at the outlet of the through holes. It contains a suspension device for hydraulic drives 8, guide rods 19 protrude from the body 1 of the preventer towards the hydraulic drives, with the possibility of longitudinal movement, connected to the brackets 20, the brackets 20 are fixed on the body 9 of the hydraulic drive, while the length of the guide rods is not less than the length of the die. The technical result consists in providing the possibility of replacing the cylindrical rams of the preventer without removing the hydraulic actuators from the body. 6 ill.

Description

Technical field

The technical solution relates to equipment for servicing oil and gas wells, for sealing the mouth of oil and gas wells during their construction, development and repair in order to ensure the safe conduct of work to prevent and eliminate oil and gas and water manifestations and open fountains, to protect the subsoil and the environment. In particular, it refers to a double blowout preventer with cylindrical rams and hydraulic ram drives equipped with a bypass manifold.

State of the art

The double ram preventer is designed for sealing the mouth of oil and gas wells, by shutting off, by means of a ram gate, the wellhead with a lowered tubing string or with equipment lowered on a flexible line (pipes, cable, cable, wire), and without a lowered tubing string and without lowered equipment.

Known ram-type preventers, which, as a rule, contain a body with a through hole, inside which are placed ram valves, actuated by a hydraulic drive, to block the body through hole. The preventer rams are related to the working parts of the ram preventer. The ram gate consists of two rams with elastomeric seals, installed oppositely in the preventer body, and blocking the through axial channel (central through hole) with or without a pipe in it. The typical action of the die is reduced to the fact that they open or close, moving inside the case.

The operation of preventers is carried out under conditions of aggressive environmental influence, which affects the service life of ram gates, reduces its performance, durability, and reliability. Failures in the operation of preventer ram valves cause depressurization of the wellhead, the through axial channel is not blocked, which leads to accidents, and fluid is released.

Rams are elements that require replacement during the operation of the preventer, and also require replacement of the gaskets of the rams. In addition, it is often necessary to replace the tubular rams with shear rams or blind rams, or vice versa, to provide different BOP functions. Ensuring the possibility of replacing the preventer rams at the wellhead is a mandatory requirement for its operation, because in the process of research and repair of wells, cable, torso, pipes of various sizes are used. Therefore, it is important that the blowout preventer provides easy access to and maintenance of internal components such as rams.

Dies, as a rule, are equipped with drives and closed with lids. Covers are attached to the body, for example, with bolts or studs with nuts. Alternatively, the covers may be attached to the body with a hinge (hinge) and bolts so that the cover can be rotated sideways for maintenance access.

Known ram preventer with hinged covers to replace the rams (source [1]: RU 2164585). The preventer consists of a body, covers, a hydraulic drive, rams, a rotary hydraulic transition. The hydraulically operated lid is hinged to the body and can be rotated sideways around the cylindrical pins. To replace the die, the cover leans to the side, turning on the hinges.

The preventer [1] contains a hydraulic drive suspension system for replacing rams. However, hinged covers that slide out of the way are inconvenient to handle disassembled when hanging on the side of the BOP body. The hinges are on one side of the body and the flipped cover is held on one side of the body when the connecting bolts are removed. When assembling preventers in a complex, which is required quite often, the hinges on the bodies of individual preventers can be located on different sides of the assembly, and in this case the covers are folded down on different sides of the assembly, this may require additional space for placing equipment, and also limit the possibilities of assembling layouts of these preventers. In some cases, there may not be enough room to swing the drive cover out of the way properly for quick access to the rams. Also, the disadvantage of the preventer [1] is that the dies are made of a prismatic shape. The rams and ram cavities of the preventer [1] are made in a prismatic shape with guides; this requires, in contrast to the cylindrical shape of the rams, the use of additional mechanical surface treatment. The rams and ram cavities have a large cross-sectional width, which accordingly increases the width of the body and the dimensions of the preventer. In addition, the preventer does not have a bypass valve, does not allow to control the pressure in the well, drain liquids from the well and safely release pressure in the well, does not allow injection of various technical media (liquids, inhibitors, solutions, etc.) directly into the well at carrying out technological work and in the process of geophysical studies of the well.

Known preventer ram hydraulic double PPG 2-"frontier" (source [2]: RU 61779). The preventer contains a double housing with upper and lower flanges, having a through axial channel for the passage of pipes lowered into the well. There are two ram shutters installed in the body. The dies move in the horizontal channels of the body in a direction perpendicular to its axial channel. The movement of the dies is carried out by hydraulic actuators attached to the upper and lower stages of the housing from its opposite end sides. The body is equipped with side windows for replacing rams located perpendicular to the axial channel of the preventer body and perpendicular to the holes for the passage of hydraulic drive rods. exit to the other opposite side of the preventer body and are also closed with a single removable cover.

Implementation in the body of the preventer side windows closed by removable covers, through which the rams can be removed, reduces the strength of the body and increases the dimensions. To remove the dies, unscrew the nuts with which the side covers are attached to the body, while during maintenance it is also necessary to replace the seals;

In addition, analogue [2] is not suitable for use with a flexible cable, as it contains dies designed to seal metal tubing (tubing). The dies and ram channels are made of a complex prismatic shape, which requires the use of additional mechanical surface treatment. Dies and die cavities are wide, have a large cross-sectional width, which accordingly increases the width of the body. The design of the dies (pipe, shear dies) is not adapted to work with an electric cable. The preventer does not have a bypass valve, does not allow to control the pressure in the well, drain liquids from the well and safely release pressure in the well, does not allow injection of various technical media (liquids, inhibitors, solutions, etc.) directly into the well during technological works and in the process of well logging.

Known double cable preventers with hydraulic control and bypass valves (source [3] patent RU 179918, source [4] patent RU 179917). The preventer [3;4] contains a body with a vertical passage channel and horizontal cylindrical ram channels located across the longitudinal axis of the vertical passage channel. Two ram gates are located in cylindrical ram cavities. Each plate is equipped with a movement mechanism, a total of four movement mechanisms are installed, one for each of the dies. The movement mechanism is made in the form of a hydraulic cylinder connected to a manual screw linear drive. The dies in the cavities are installed with the possibility of reciprocating movement towards the vertical passage channel and in the opposite direction. The hydraulic cylinder contains a cylindrical body in which the piston is installed. The piston contains a pusher connected to the die with the possibility of separation. Cylindrical bodies of hydraulic cylinders are installed in the grooves of the body and fixed with union nuts. The cylindrical body of the hydraulic cylinder is partially immersed in the body and, in conjunction with the cylindrical channel, forms a ram cavity. The cylindrical body channels at the inlet contain a groove of variable diameter, the cylindrical body of the hydraulic cylinder is installed at one end into the body groove. The cylindrical body of the hydraulic cylinder is fixed in the groove of the body with a union nut. The preventer is equipped with bypass valves. The housing contains through holes in the upper and lower parts of the ram cavities. A housing with a bypass valve is installed at the outlet of the holes. Bypass valves provide the ability to open ram valves in the presence of pressure in the well. The presence of a bypass valve and through holes in the through hole of the preventer body, made in the wall of the preventer body, above and below the rams, allows, if necessary, to equalize the pressure by opening communication between the through holes.

The disadvantage of preventers [3,4] is that they do not have a mechanism that ensures the retention of hydraulic drives on the preventer body when replacing rams, they are not equipped with a system that provides suspension of hydraulic cylinder bodies on the body. For large hydraulic actuators, preventers with a through passage of more than 120 mm, the mass of hydraulic actuators with housings becomes significant, and the replacement of rams becomes a time-consuming process. In order to change the slips directly at the wellhead, the nut is unscrewed and the hydraulic drives are removed, laying next to the preventer.

Thus, the problem lies in the fact that the design of hydraulic double preventers equipped with bypass valves [3,4] does not provide suspension of hydraulic drives of cylindrical rams on the body to hold them in the process of replacing rams.

The essence of the technical solution

It can be seen from the prior art that the existing analogues have inherent disadvantages and require improvement. It is required to expand the arsenal of existing technical means designed for hermetic remote closure of the pipe channel of the well in the process of its development, repair and research using instruments on a geophysical cable.

The technical objective of the proposed solution is to create a double preventer with cylindrical rams, which has improved performance, providing a simple and convenient replacement of the rams. The constructive solution allows to remove and install cylindrical rams in the horizontal channels of the body during maintenance without removing the hydraulic actuators from the preventer body.

The technical result consists in providing the possibility of replacing cylindrical rams without removing the hydraulic actuators from the housing.

The technical result is achieved by the fact that the dual hydraulic ram preventer contains a body with a vertical through hole and horizontal cylindrical ram cavities, two ram gates are located in the ram cavities, where each ram is equipped with a movement mechanism in the form of a hydraulic drive, containing a housing in which a piston and a pusher are installed connected to the die, with the possibility of separation. Moreover, the body of the hydraulic drive at one end is partially immersed in the groove of the preventer body and is fixed with a union nut. The preventer body contains through holes in the upper and lower parts of the ram cavities of the upper and lower ram gates, a plate with bypass valves is installed at the outlet of the through holes. It contains a suspension device for hydraulic drives, made in the form of guide rods protruding from the preventer body towards the hydraulic drives, which are connected with the possibility of longitudinal movement with brackets fixed on the hydraulic drive housing, while the length of the guide rods is not less than the length of the die.

The dual ram preventer with the described technical solution can be made with hydraulically actuated ram movement mechanisms, or combined ram movement mechanisms in the form of a hydraulic cylinder connected to a manual screw linear drive.

The length of the pins is calculated so that the hydraulic drive can be moved away from the body to a distance that allows you to safely remove the die with the die holder and install the die holder back with another die.

The proposed solution expands the arsenal of technical means for sealing the mouth of oil and gas wells during their construction, development and repair in order to ensure the safe conduct of work to prevent and eliminate oil and gas and water manifestations and open fountains, to protect the subsoil and the environment.

The housing with bypass channels and shut-off valves performs the function of a bypass manifold, provides the possibility of equalizing pressure in the well zone under the preventer rams, between the rams and above the preventer rams in the wellhead equipment, as well as supply, discharge, flow of various liquids during various technological operations during development, repair and geophysical surveys of wells.

The invention is illustrated by graphic materials:

figure 1 - preventer 2PKG-130x70, side view in section with flanges;

figure 2 - double hydraulic ram preventer 2PKG-140x70, general view;

figure 3 - preventer 2PKG-130x70, view from the side of the hydraulic drives;

Fig.4 - case of a dual ram preventer with a bypass monofold;

Fig.5 - preventer, view from the side of the hydraulic drives;

Fig.6 - dual hydraulic ram preventer, the general view of the body is shown transparent, shown without flanges.

Specification

1) body;

2) through hole;

3) lower ram shutter;

4) top ram shutter;

5) lower ram cavity;

6) upper ram cavity;

7) die;

8) hydraulic drive;

9) hydraulic drive housing;

10) piston;

11) pusher;

12) union nut

13) stove;

14) bypass channel: 14V-upper, 14C-middle, 14H-lower;

15) blocking valve: 15V-upper, 15C-middle, 15H-lower;

16) central channel;

17) bypass channel;

18) through holes;

19) guide rods;

20) bracket.

21) fitting

22) entrance;

23) top exit;

24) bottom exit.

Device implementation

Example 1

Double hydraulic preventer with a bypass manifold and with a suspension device for hydraulic drives. Figure 1; 3 shows a dual hydraulic ram preventer 2PKG-130x70-2F (double preventer with a nominal bore of 130 mm, an operating pressure of 70 MPa, double-flange with a bypass manifold and cylindrical rams), in Fig. 2 double hydraulic ram preventer 2PKG-140x70 of a similar design. Preventer (figure 1; 2; 3) ram hydraulic dual contains a body 1 with a vertical through hole 2 and two ram gates 3 and 4. In the horizontal cylindrical ram cavities of the lower 5 and upper 6, cylindrical rams 7 are located. Housing 1 (Fig. 4) the preventer can be made with a through hole diameter 2 selected in the range from 65 to 180 mm, equal to 65 mm, 80 mm, 105 mm, 120 mm, 130 mm, 140 mm, 152 mm, 160 mm, 180 mm. In FIG. 1 shows a blowout preventer with bore 2 having a diameter of 130 mm. In FIG. Figure 2 shows a preventer with a through hole 2 diameter of 140 mm, similarly, bodies 1 with other sizes of the through hole 2 are made. Each die 7 is equipped with a movement mechanism in the form of a hydraulic drive 8, containing a housing 9, in which a piston 10 and a pusher 11 are installed, connected to the die 7, with the possibility of separation. Moreover, the housing 9 of the hydraulic actuator 8 is partially submerged at one end into the groove of the preventer housing 1 and fixed with a union nut 12. A manifold is installed on the preventer housing 1, containing a plate 13 with bypass channels 14 (where 14V is upper, 14C is middle, 14H is lower), with shut-off valves 15 (where 15V is upper, 15C is middle, 15H is lower) with a central channel 16 and a bypass channel 17. Through holes 18 are made in the body 1 of the preventer into the upper and lower parts of the ram cavities of the upper 4 and lower 3 of the ram shutter. The plate 13 is installed at the outlet of the through holes 18 and the channels 14, 16, 17 communicate with the through hole 2 of the body through the through holes 18.

The preventer contains a suspension device for hydraulic drives 8. Guide rods 19 protrude from the body 1 of the preventer towards the hydraulic drives 8 (in the direction parallel to the longitudinal axis of the hydraulic drives), under two guide rods 19 for each hydraulic drive 8. Two brackets 20 are bolted to the body 9 of the hydraulic drive 8. The guide rods 19 are connected to the brackets 20 with the possibility of longitudinal movement. Thus, the housing 9 of the hydraulic actuator 8 on two brackets 20 is able to move along the guide rods 19. The guide rods 19 are threaded for installation in the threaded recesses made in the body 1 of the preventer. The length of the guide rods 19 is not less than the length of the die 7. The length of the guide rods 19 allows you to move the hydraulic actuator 8 away from the body 1 to a distance that allows you to completely remove the die 7 with the die holder and install it back with another die 7.

Example 2. (Fig.5)

Figure 5 shows a preventer (flanges not shown) of a similar design, made with the difference that it contains a suspension device for hydraulic drives 8 with four guide rods 19 for each hydraulic drive 8. From the body 1 of the preventer towards the hydraulic drives 8 (in the direction parallel to the longitudinal axis guide rods 19 protrude, under four guide rods 19 for each hydraulic drive 8. Two brackets 20 are bolted to the body 9 of the hydraulic drive 8. The guide rods 19 are connected to the brackets 20 with the possibility of longitudinal movement. Thus, the housing 9 of the hydraulic drive 8 on two brackets 20 is able to move along the guide rods 19. The guide rods 19 are threaded for installation in threaded recesses made in the preventer housing 1. The length of the guide rods 19 is not less than the length of the die 7. The length of the guide rods 19 allows you to move the hydraulic actuator 8 away from the body 1 to a distance that allows you to completely remove the die 7 with the die holder and install it back with another die 7.

Example 3. (Fig.6)

The dual ram preventer comprises a housing 1 with a through hole 2 and two ram gates 3 and 4. Ram gates 3 and 4 are made with cylindrical rams 7. Ram gates 3 and 4 are installed in ram channels 5 and 6 located across the through hole 2 of the housing 1. The rams 7 are equipped with mechanisms for moving 8 rams 7. The body 1 (Fig. 6) of the preventer is made with a diameter of the through hole 2 equal to 160 mm. The body 1 of the preventer is equipped with a threaded thread, through which a flange of the corresponding size is attached to the body 1 of the preventer. Movement mechanisms 8 are combined in the form of a hydraulic cylinder connected to a manual screw linear drive. In the wall of the body 1, four through holes 18 are made that open into the through hole 2 of the body 1 in the space above, below and between the ram gates 3 and 4. Moreover, on the wall of the body 1 of the preventer, above the through holes 18, a plate 13 with bypass channels 14 and shut-off valves is installed 15. The plate 13 covers all four through holes 18, while in the plate 13 there is a through central channel 16 connecting three bypass channels 14 (14V-upper, 14C-middle, 14H-lower), equipped with shut-off valves 15, connected to three through holes 18 extending into the space above, below and between the ram gates 3 and 4. The housing 13 has a fourth bypass channel 17 connected to the fourth through hole 18 extending into the space between the ram gates 3 and 4. The bypass monofold ensures the flow of well and process fluids into various cavities passage hole 2 in the body 1 of the preventer. Bypass channels 14 (lower 14H, middle 14C, upper 14B) are connected through fittings 21 with through holes 18 made in housing 1 to through hole 2 in preventer housing 1. Fittings 21 are installed on the side of the monofold adjacent to the body 1 of the preventer. Bypass valves 15 are installed in the cavities and block the bypass channels 14 communicating with the central channel 16. On the adjacent side of the plate 13, a hole 18 is made, connected through a fitting 21 with a through hole 2 in the body 1 of the preventer. On the other hand, this hole is connected to the inlet 22 for technological injection of liquids. The central channel 16 has two technological threaded outlets, top 23 and bottom 24.

Bypass fittings 18 have sealing rings and provide sealing between the body 1 of the preventer and the body 13 of the bypass manifold.

The preventer contains a suspension device for hydraulic drives 8. Guide rods 19 protrude from the body 1 of the preventer towards the hydraulic drives 8 (in the direction parallel to the longitudinal axis of the hydraulic drives), under two guide rods 19 for each hydraulic drive 8. Two brackets 20 are bolted to the body 9 of the hydraulic drive 8. The guide rods 19 (size M 24×2.5×350 mm) are connected to the brackets 20 with the possibility of longitudinal movement. The guide rods 19 are made with turnkey flats. Thus, the housing 9 of the hydraulic actuator 8 on two brackets 20 is able to move along the guide rods 19. The guide rods 19 are threaded for installation in the threaded recesses made in the body 1 of the preventer. The length of the guide rods 19 is not less than the length of the die 7. The length of the guide rods 19 allows you to move the hydraulic actuator 8 away from the body 1 to a distance that allows you to completely remove the die 7 with the die holder and install it back with another die 7.

Work description

The preventer is installed at the mouth of an oil or gas well for its maintenance, in the process of well workover (WO) or during geophysical work.

The preventer is attached to the flange of the wellhead cross for sealing the well when lowering geophysical instruments, perforators and other equipment into it on flexible lines (cable, cable, rope, wire) in the process of development, research, perforating and blasting, in the process of repair, as well as in interruptions of these works and in dangerous situations. To seal the well in the housing 1, the through hole is blocked with 2 ram valves (3 or 4). If there is no flexible line in the well, the lower blind ram gate 3 is closed. If there is a flexible line from the lowered equipment in the well, the upper cable ram gate 4 is closed. The process of closing/opening the rams 7 is known to specialists. The presence of two ram gates 3 and 4 with cable and blind rams 7 in one preventer makes it possible to seal the well in the presence of a cable in the well and in its absence, i.e. no need to use two preventers with different rams or change rams. Ram shutters 3,4 are closed remotely via hydraulic lines or in manual mode, depending on the design of the drive mechanism 8 of the rams 7 used in the preventer. The rams 7 move in the housing 1 independently of each other. As a result of the oncoming movement, the blind dies 7 come into contact with each other and block the through hole 2. As a result of the oncoming movement of the cable dies 7, they block the through hole 2. The cable dies 7 reach the cable surface and tightly crimp the cable. The rams 7 move in the body 1 independently of one another, in their extreme closed position they converge in the center of the body 1 and block the well. The preventer is operated under conditions of aggressive environmental impact, at elevated pressures. Working medium (fluid) - oil, gas, gas condensate, reservoir water, flushing fluid and mixtures thereof. These factors have a negative impact on the service life of the ram valves 3, 4 reduce performance, durability, reliability, reduce the overhaul interval and the time between failures. The difference in the pressures of the medium, in the space above, below, between the ram valves 3 and 4 leads to the emergence of forces preventing the movement of the rams 7 in the channels 5 and 6. The difference in pressure increases the friction forces, causes distortions, prevents the ram 7 from sliding, this increases the amount of wear during operation, the risk of preventer failure increases.

When carrying out work in a well with the extraction of tubing, a preventer with a conditional passage of a through hole 2 of a larger diameter, for example, 140 mm, 152 mm, 160 mm, 180 mm, is attached to the wellhead flange.

With the use of a preventer, the well is flushed, inhibitors, solutions of acids, alkalis, etc. are poured. and prepare it for future use.

The preventer provides the possibility of replacing the preventer rams, convenient access to internal elements, such as rams, for their maintenance.

Dies replacement

The preventer contains a suspension mechanism that ensures the retention of hydraulic drives 8 on the body 1 of the preventer when replacing rams 7. This is especially important for large hydraulic drives, for preventers with a through passage of more than 120 mm, where the mass of hydraulic drives 8 becomes significant, and replacing rams 7 becomes a very laborious process. In order to change the slips 7 directly at the wellhead, the nut 12 is unscrewed and the hydraulic drive 8 is disconnected from the body 1. The body 9 of the hydraulic drive 8 on two brackets 20 is able to move along the guide rods 19. The length of the guide rods 19 allows you to move the hydraulic drive 8 away from the body 1 by a distance that allows you to completely remove the die 7 with the die holder and install it back with another die 7. The hydraulic drive 8, held on the brackets 20, is moved along the rods 19 and removed from the body 1, providing a complete exit from the body 1 of the die 7 together with the die holder. The die 7 is removed from the die holder, disconnected from the pusher 11, and another die 7 is installed. Then the hydraulic drive 8 is connected to the body 1 by tightening the union nut 12. The operation is similarly performed with other dies 7 and hydraulic drives 8.

Guide rods 19 and brackets 20 provide suspension of hydraulic actuators 8 on body 1 to hold them during replacement of rams 7.

The difference in medium pressures, in the space above, below, between ram valves 3 and 4 leads to the emergence of forces preventing the movement of rams 7 in channels 5 and 6. In the described preventers, it is possible to safely release the residual pressure in the well, dispose of well fluids (fluids, gases etc.) and after that it is safe to open both the lower blind dies 7 and the upper cable (pipe, cable) dies 7.

Safe opening of the rams 7 of the lower ram shutter 3 is carried out as follows.

Previously, all shut-off valves 15 (15V, 15C, 15H) of the plate 13 are closed. Entrance 22 is closed with a plug. A pressure gauge (not shown in the diagrams) is connected to the top outlet of the top 23 of the central channel 16. To the lower outlet 24 of the Central channel 16 is connected to a high pressure hose (HPR) with a quick coupling (BRS). High pressure hoses with fast couplings for draining well fluids into disposal tanks.

To open the blind rams 7 of the lower ram shutter 3 of the preventer, excluding possible water hammer due to residual pressure in the well, the lower shut-off valve 15N is opened. Valves 15C and 15B remain closed.

After the valve 15H is opened, the well fluid located in the body 1 of the preventer from below under the blind rams 7 of the lower ram shutter 3 begins to flow through the hole 18 and fitting 21 into the cavity of the bypass channel 14H, in which the valve 15H is installed. Since the valve 14H is open, the well fluid flows into the central channel 16.

After filling the central channel 16 with well fluid, the pressure is controlled by the pressure gauge at the top outlet 19.

Using a high pressure hose with a quick coupling connected to the lower outlet 24, well fluids are diverted into disposal tanks and, accordingly, the residual pressure in the well is relieved.

After dumping the residual pressure in the well to atmospheric pressure (control is carried out by the pressure gauge at the top outlet 23), the blind rams 7 of the lower ram shutter 3 of the preventer can be safely opened.

Safe opening of the plates 7 of the upper plate shutter 4 is carried out as follows.

Previously, all valves 15 (15V, 15C, 15H) are closed. Entrance 22 is muted. A manometer is connected to the top outlet 23. To the lower outlet 24, a high-pressure hose with quick coupling is connected to drain well fluids into disposal tanks.

To safely open the upper rams 7 of the ram gate 4, which sealed the equipment lowered on flexible lines into the well (the blind lower rams 7 of the lower ram gate 3 are open at the same time), the middle shut-off valve 15C is opened by counterclockwise rotation. Valves 15B and 15H remain closed.

After the valve 15C is opened, the well fluid, which is in the body 1 of the preventer in the through hole 2 from below under the upper rams 7 of the upper ram shutter 4, begins to flow through the through hole 18 and the fitting 21 into the cavity of the bypass channel 14C, in which the shut-off valve 15C is installed. Since the shutoff valve 15C is open, the well fluid flows into the central channel 16.

After filling the central channel 16 with well fluid, the pressure is controlled by a pressure gauge connected to the top outlet 23.

Using a high pressure hose with a quick coupling connected to the lower outlet 24, well fluids are diverted into disposal tanks and, accordingly, the residual pressure in the well is relieved.

After dumping the residual pressure in the well to atmospheric pressure, the upper rams 7 of the upper ram shutter 4 of the preventer can be safely opened.

The claimed technical solution is implemented using materials produced by the industry, and can be used for its intended purpose.

Claims (3)

1. A double hydraulic ram preventer containing a housing with a vertical through hole and horizontal cylindrical ram cavities, two ram gates located in the ram cavities, where each ram is equipped with a movement mechanism in the form of a hydraulic drive, containing a housing in which a piston and a pusher are installed, connected to a ram with the possibility of separation, wherein the body of the hydraulic drive is partially immersed at one end into the groove of the preventer body and is fixed with a union nut, the preventer body contains through holes in the upper and lower parts of the ram cavities of the upper and lower ram gates, a plate with bypass valves is installed at the outlet of the through holes, characterized in that it contains a suspension device for hydraulic drives, made in the form of guide rods protruding from the preventer body towards the hydraulic drives, which are connected for longitudinal movement with brackets fixed on the body hydraulic drives, while the length of the guide rods is not less than the length of the die. 2. Double hydraulic ram preventer according to claim 1, characterized in that it contains two guide rods for each hydraulic actuator. 3. Double hydraulic ram preventer according to claim 1, characterized in that it contains four guide rods for each hydraulic actuator.

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