RU2561828C2 - Perforation system sequential initiation device - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: invention is related to oil and gas simulation systems and may be used at perforation of wells with shape-charged perforators. The invention comprises a body, electric conductor, piston, cartridge with detonating cord placed inside it, detonation transmitting unit, electric detonator, and contact of electric detonator. The claimed device is equipped with movable electric contact placed at the first but end of the piston. The top part of the piston is conical. At the second butt end part of the piston there is a dead-end hole with diameter equal to diameter of the top end of electric contact in the perforator lower section.

EFFECT: simple docking of the perforation system sequential initiation device with perforator sections at assembly and increased reliability of connections.

2 dwg

Description

The invention relates to systems for intensifying oil and gas production and may find application in the implementation of well perforation by cumulative perforators.

Known similar devices for sequential initiation of a perforation system, comprising a housing, an electric wire, a piston, a cartridge inside which a detonating cord is placed, a detonation transmission device, an electric detonator, an upper contact (see, for example, descriptions of inventions to US patents 8387533 B2, IPC F42C 15 / 40 (2006.1), publication date 05/05/2013; US 7902469 B2, H01H 35/38, publication date 03/08/2011; US 2010/0208408 A1, H01H 47/24, publication date 08/19/2010).

The disadvantage of analogues is the complexity of docking a device for sequential initiation of a perforation system with sections of a perforator.

The closest analogue is a device for sequentially initiating a perforation system, comprising a housing, an electric wire, a piston, a cartridge inside which a detonating cord is placed, a detonation transmission device, an electric detonator, an electric detonator contact (see, for example, the description of the invention to patent US 8387533 B2, IPC F42C 15 / 40 (2006.1), publication date 05/05/2013).

The disadvantages of the closest analogue are the complexity of the docking device sequential initiation of the punch system with sections of the punch during assembly and lack of reliability due to the fact that the connection element of the electric wire (key 37 of figure 4 of US patent 8387533) with a contact (pos. 59 of figure 4 of US patent 8387533) is movable together with the piston and the place of crimping the electric wire in the contact is vulnerable, in particular, when the node is triggered, the wire can break out of the contact.

The technical result is to ensure ease of docking of the device for sequential initiation of a perforation system with sections of a perforator during assembly and to increase the reliability of joints.

The invention is characterized in that the device for sequential initiation of the perforation system comprises a housing, an electric wire, a piston, a cartridge, inside which a detonating cord is placed, a detonation transmission device, an electric detonator, an upper contact, and differs from the closest analogue in that it is equipped with a movable electric contact located on the first end part of the piston facing the upper contact, the upper part of the piston is made conical, on the second end part of the piston a blind hole with a diameter equal to the diameter of the upper end of the lower electrical contact section perforator.

The invention is illustrated by the following drawings.

In Fig.1 shows a side view in section before the operation of the lower section of the punch;

figure 2 shows a side view in section after the operation of the lower section of the punch.

The sequential device for initiating a perforation system comprises a housing 1, an electric wire 2, a piston 3, a cartridge 4, inside which a detonating cord 5 is placed, a detonation transmission device 6, an electric detonator 7, an upper contact 8. The claimed device is equipped with a movable electrical contact 9 located on the first end part of the piston 3, facing the upper contact 8. The upper part of the piston 3 is made conical. On the second end part of the piston 3 there is a blind hole 10 with a diameter equal to the diameter of the upper end of the electrical contact 11 of the lower section of the perforator 20.

The end of the electric wire 2 is connected to the contact to ground 17, for example, by means of a screw.

In the partition of the housing 1, a through conical hole 12 is made, facing its expanded end towards the upper part of the piston 3 of a conical shape. The through conical hole 12 is located coaxially with the movable electrical contact 9 and the piston 3. The ground contact 17 has a hole with a diameter equal to the diameter of the upper end of the movable electrical contact 9. The detonation transmission device 6 is installed coaxially with the detonating cord 5 of the upper section of the punch 19 connected to case 1.

The piston 3 is located in the cylinder 13 of insulating material, fixed in the housing 1 by a nut 15. The length of the cylinder 13 is determined by the required stroke of the piston 3, which depends on the required clearance between the movable electrical contact 9 and the upper contact 8 to prevent premature operation of the electric detonator 7. Initial position the piston 3 in the cylinder 13 is provided with a retaining ring 18. At the upper end of the lower section of the perforator 20 there are channels for the passage of gases after the explosion to the lower part of the piston 3. Cartridge 4 is fixed in housing 1 with nut 14.

The electric detonator 7 is always connected to the “+” of the electric circuit before being triggered through the wire 2, and is not connected to the mass “-” of the electric circuit, while there is no potential difference. An electric circuit formed from the lower contact 16 to the contact installed in the upper part of the cartridge 4, through the cartridge 4 to the casing, in which the cartridge 4 is placed and from the casing to the electric detonator.

Between the other higher sections of the punch, the same devices for sequential initiation of the punch system, including sections of the punch, are installed.

The device sequential initiation of the perforation system is as follows.

In the initial position, the piston 3 is in the lower position and the movable electrical contact 9 and the upper contact 8 are interconnected. The current flow to the electric detonator 7 is excluded.

After lowering the perforation system into the well, the lower section of the perforator is blown up, after which the device for sequential initiation of the perforation system is ready for operation. After undermining the lower section of the perforator by increasing the pressure, the piston 3 moves in the cylinder 13 until the stop of the cone-shaped part of the piston 3 into the cone-shaped surface of the hole 12 in the partition of the housing 1.

After the piston 3 is displaced, the movable contact 9 is disconnected from the contact of the upper 8 and connected to the contact 17 to ground, as a result of which the mass “-” of the electric circuit appears in the electric detonator 7 by means of wire 2. The electrical contact 9, the ground contact 17 and the upper contact 8 are closed to each other and allow current to flow through the wire 2 to initiate the electric detonator 7 and the entire detonation circuit of the upper section of the perforator 19 connected to it. The upper, higher located section of the perforator 19 is connected to the explosive system and ready to undermine.

The proposed design is simple and reliable, since it does not require additional electrical components such as LEDs, light receivers, electromechanical relays. There is no need to move the ends of the electric wires 2, clamped in electrical contacts (as in the closest analogue).

By putting the piston 3 into the housing 1 along the cone after actuation, additional tightness is ensured (in addition to the o-rings installed on the piston 3), which eliminates the filling / penetration of liquid from the lower triggered section into the upper following sections of the perforator.

Claims (1)

A sequential device for initiating a perforation system comprises a housing, an electric wire, a piston, a cartridge, inside which a detonating cord is placed, a detonation transmission device, an electric detonator, an upper contact, characterized in that it is equipped with a movable electric contact located on the first end part of the piston facing the upper contact , the upper part of the piston is conical in shape, a blind hole is made on the second end part of the piston with a diameter equal to the diameter of the upper end of the electric contact-parameter lower section perforator.

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