RU2241112C1 - Preventer - Google Patents

Abstract

FIELD: oil and gas extractive industry.

SUBSTANCE: device has body with axial channel, left and right screw-thread dies mounted on guides and having compacting collars for pipes sealing, which pipes are lowered into well through axial channel in body. For sealing well in case of absent pipes in axial channel a gate is used. Driving mechanisms for left screw-thread die and gate are placed on one common side cover. Driving mechanisms for right screw-thread die is placed on another separate cover. Guiding elements of right screw-thread die are placed lower than guiding elements for left screw-thread die for value enough for free placement of left screw-thread die on guiding elements of right screw-thread die. Left screw-thread die driving mechanism provides three operation positions for it: closed, open, dismounting. In closed and open positions left screw-thread die is placed on guides of left screw-thread die. In dismounting position left screw-thread die is placed on guides of right screw-thread die and in same moment is outside the kinematical connection to driving mechanism of left screw-thread die.

EFFECT: minimized vertical dimension of preventer, lower laboriousness of field maintenance.

13 dwg

Description

The invention relates to the class of dual preventers used in the underground repair of oil and gas wells, and is used to seal the mouth in the event of an emergency at the well, as well as during a long break in work.

Known dual preventer containing a housing with an axial channel, dies with a drive and sealing elements for sealing pipes [1].

A disadvantage of the known preventer is that equipping each die with an individual cover leads to an increased vertical dimension and, if necessary, to replace the dies in the field, it is necessary to dismantle both side covers of the preventer.

Also known is a double preventer containing a housing with an axial channel, dies with a drive and sealing elements for sealing pipes [2].

A disadvantage of the known preventer is also that the equipping of each die with an individual cover leads to an increased vertical dimension and, if necessary, to replace the dies in the field, it is necessary to dismantle both side covers of the preventer.

The technical problem solved by the invention is the creation of a double preventer of a minimum vertical dimension with the possibility of extracting one die through the working cavity of the other, using the window formed after removing the side cover with the drive mechanism of the die.

The problem is solved in that the preventer containing the housing with an axial channel, left and right dies mounted on the guide elements and having sealing cuffs for sealing pipes that are lowered into the well through the axial channel in the housing, a gate for sealing the well in the absence of pipes in the axial channel , the side covers with the drive mechanism of the dies and the gate, made so that the drive mechanisms of the left die and the gate are located on one common side cover, and the drive mechanism of the right die is located on another separate roofs ke, while the guiding elements of the right die are located lower than the guiding elements of the left die by an amount sufficient for free (without tension of the sealing elements) placement of the left die on the guiding elements of the right die, in addition, the drive mechanism of the left die provides the last three operating positions: “ open ”,“ closed ”and“ dismantling ”; in the “open” and “closed” positions, the left die is located on the guiding elements of the left die, and in the “dismantling” position the left die is located on the guiding elements of the right die and at this moment is out of kinematic connection with the drive mechanism of the left die. The invention is illustrated by drawings, which depict:

Figure 1 is a General view of the preventer in its original position (in the open position).

Figure 2 - General view of the preventer with a closed gate.

Figure 3 is a General view of the preventer with the gate closed and the dismantled side cover with the drive of the right die.

Figure 4 is a General view of the preventer with the gate closed, the dismantled side cover with the drive of the right die and the right die removed. Here, the letter “A” indicates the position of the guide element 3, and the letter “B” indicates the position of the guide element 5.

Figure 5 is a General view of the preventer when the gate is closed, with the side cover removed with the drive of the right ram, with the right ram removed and the left ram turned into the closed position.

Figure 6 is a General view of the preventer with the gate closed, with the side cover disassembled with the right ram drive, with the right ram removed, the left ram turned to the closed position and the restriction sleeve removed.

In Fig.7 is a General view of the preventer with the gate closed, with the side cover dismantled with the drive of the right ram, with the right ram removed, the left ram turned to the closed position, the limit sleeve removed and the left ram turned to the dismantle position. At the moment, the left die is located at a lower level of the guide grooves of the right die, its upper sealing elements are released from contact with the preventer body, the two-stage screw of the drive mechanism is out of engagement with the mating socket of the left die. The left die is ready to be removed through the side window formed after removing the side cover with the drive mechanism of the right die.

On Fig is a General view of the preventer with the extracted left and right dice.

In Fig.9 is a General view of the drive of the right die in the initial position "open".

Figure 10 is a General view of the drive of the left die in the initial position "open".

Figure 11 is a General view of the drive of the gate in the initial position "open".

On Fig - General view of a double cover with the drive mechanisms of the left die and the gate.

In Fig.13 is a General view of the double cover with the drive mechanism of the right die.

The preventer comprises a housing 1 with an axial channel 2, guide elements 3 with a left die 4 located on them, guide elements 5 with a right die 6 located on them, a side cover 7 with a drive mechanism for the right die located on it, and a double side cover 8 with her drive mechanisms of the left die 4 and the gate 9 (figure 1). The left die 4 and the right die 6 are equipped with sealing cuffs: the upper 10 for sealing the dies in the housing 1 of the preventer and the central 11 for sealing the dies on the outer surface of the pipe. The guiding elements 5 are located below the level of the guiding elements 3 so that the left die 4 would freely pass through the working cavity of the right die 6 without touching the housing 1. The observance of this condition ensures easy removal of the left die 4 through the working cavity of the right die 6 .

The drive mechanism of the right die contains a two-stage screw 12 connected by one thread to the rod 13, the other thread - with the housing sleeve 14, rigidly mounted on the side cover 7 (Fig.9).

The drive mechanism of the left die contains a two-stage screw 15, connected by one thread to the left die 4, the other thread - with the housing sleeve 16, rigidly mounted on a double side cover 8 (figure 10). At the end of the two-stage screw 15, a restrictive sleeve 17 is mounted, fixed by a bolt 18.

The drive mechanism of the gate 9 contains a two-stage screw 19, connected by one thread to the gate 9, the other thread - with the housing sleeve 20, rigidly mounted on a double side cover 8 (11).

Preventer job. If necessary, in the field to remove the dies from the housing and replace them with others proceed as follows. The gate 9 is moved from the “open” position to the “closed” position (figure 2). Disconnect the side cover 7 and remove the right die 6 (Figs. 3, 4). The left die 4 is moved from the “open” position to the “closed” position (FIG. 5). Disconnect the restriction sleeve 17 (Fig.6) and move the left die 4 from the “closed” position to the “dismantle” position (Fig.7). At this moment, the left die 4 disengages from the two-stage screw 15 and lowers to a lower level - onto the guiding elements 5 and the upper sealing collar 10 comes out of contact with the housing 1. The left die 4 becomes free for easy removal of the right die 6 from the working cavity The installation of new dies is carried out in the reverse order.

The use of one double side cover instead of two single side covers allows you to minimize the vertical dimension of the preventer, and removing both dies through the working cavity of the other plate through the window formed after removing the side cover with the drive mechanism, reduces the complexity of the work of replacing the dies in the field.

Sources of information

1. Composite - a catalog of oil and gas equipment and services. Third edition, M., “Fuel and Energy”, under the direction of V.Yu. Karasik, A.D. Kuzmina, p. 501, 1997-1998

2. Composite - a catalog of oil and gas equipment and services. The third issue, M., “Fuel and Energy”, under the direction of V.Yu. Karasik, A.D. Kuzmina, p. 425, 1997-1998

Claims (1)

A preventer comprising a housing with an axial channel, left and right rams mounted on the guide elements and having sealing cuffs for sealing pipes that are lowered into the well through an axial channel in the housing, a gate for sealing the well in the absence of pipes in the axial channel, side covers with drive mechanisms dies and the gate, characterized in that the drive mechanisms of the left die and the gate are located on one common side cover, and the drive mechanism of the right die is located on another separate cover, while the guiding elements s of the right die are located lower than the guiding elements of the left die by an amount sufficient for the free, without tension sealing elements to place the left die on the guide elements of the right die, while the drive mechanism of the left die is configured to provide the last three working positions: “open”, “Closed” and “dismantle”, and in the “open” and “closed” positions, the left die is located on the guiding elements of the left die, and in the “dismantle” position the left die is located on the direction elements of the right die and at this moment is out of kinematic connection with the drive mechanism of the left die.

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