RU168116U1 - DEVICE FOR PROTECTING A CUMMULATIVE PUNCHER FROM AN UNAUTHORIZED INITIATION - Google Patents

Abstract

The utility model relates to the oil and gas industry and may find application in the implementation of perforation in wells. The objective of creating a utility model is to provide more reliable protection against unauthorized initiation. The technical result is to provide a more accurate operation (on and off) of the protection device against unauthorized initiation. the task is achieved in the device for protecting a cumulative punch from unauthorized initiation, containing a housing, an apelic head in which a central core of the cable is installed, to which a central contact, made movable, means for moving the central contact, an electric detonator with a central current lead, is connected with the needle, and the means for moving the central contact is made in the form of a spring-loaded piston, inside of which there is a central contact, which is electrically isolated from the piston along the entire length. A conical rubber cuff can be worn on the central core of the cable a, ensuring the tightness of the central contact of the initiator module. The central electric input of the detonator can be sealed with a dielectric film. The piston can be spring loaded with a shock absorber. A shock absorber can be installed between the piston and the pressure plate. The shock absorber can be made of rubber. 5 cp f-ly, 3 ill.

Description

The device relates to the oil and gas industry and may find application in the implementation of perforation in wells.

A device for protecting a cumulative punch from unauthorized initiation according to the patent of the Russian Federation for utility model No. 137331, IPC E21B 43/117, publ. 02/10/2014

This device comprises a housing with an internal cavity, a piston located in a through hole in the lower part of the housing, a detonation unit including an electric detonator connected to a first booster located in the first booster sleeve by means of a detonation cord. A second booster with a second detonation cord is housed in a second booster sleeve secured to the safety sleeve. A safety sleeve with a detonation assembly and a spring are placed in the piston. The spring at one end rests on the end of the safety sleeve with the detonation assembly, and at the other end on the piston. The piston has a conical recess at the end. A groove is made in the safety sleeve, in which a pin is installed at one end, the other end of which is installed in the piston groove. A non-through hole is made in the safety sleeve, in which a finger is installed with a conical outer end, with a transverse hole and an inner end, between which and a bottom of the non-through hole a spring is installed.

Disadvantage: low reliability of protection against unauthorized initiation.

A device for protecting a cumulative punch from unauthorized initiation according to the patent of the Russian Federation for utility model No. 137330, IPC E21B 43/117, publ. 02/10/2014

This device for protecting a cumulative rock drill from unauthorized initiation comprises a housing with an internal cavity, an assembled current lead, an electric wire, a bimetallic closing device located in the internal cavity of the housing and connected in series to the electric wire rupture. The bimetallic closing device consists of two normally open contacts separated by a sleeve of insulating material. A plate of bimetallic material is located next to one of the contacts.

Disadvantage: low reliability of operation of the device (specifically its sensitive element - a bimetallic plate) due to the dependence of the response time on the temperature of oil-containing products in a particular well.

A device for protecting a cumulative punch from unauthorized initiation according to the patent of the Russian Federation for utility model No. 137055, IPC E21B 43/117, publ. 01/27/2014, the prototype.

The device for protecting a cumulative perforator from unauthorized initiation (option 2) contains a perforator head, an electric wire. It is equipped with an adapter attached to the head of the punch, inside of which a fuse housing with a fixed contact is placed, an elastic membrane glued to the end of the fuse housing with a movable contact attached to it. The fixed contact and the movable contact are connected to break the electric wire. A spring is located between the elastic membrane and the inner surface of the fuse box. The role of the moving contact moving device is performed by a spring-loaded membrane.

Disadvantage: low reliability of operation of the protection device due to various elastic-mechanical properties of the membranes, which depend on the thickness of the membrane and its material, which differ in different batches. When exposed to temperature and during prolonged storage, the mechanical properties of the membrane change and this affects the moment the device is triggered.

The task of creating a utility model: to provide more reliable protection against unauthorized initiation.

The technical result consists in providing a clearer response (turning on and off) of the device from unauthorized initiation.

The solution to this problem was achieved in a device for protecting a cumulative punch from unauthorized initiation, comprising a housing, a cable head, in which a central core of a cable is installed, to which a central contact made movable is attached. There is a needle at the end of the central contact, and the means for moving the central contact is made in the form of a spring-loaded piston, inside which a central contact is installed, which is electrically isolated from the piston along the entire length.

A conical rubber sleeve can be worn on the central core of the cable, ensuring tightness of the central contact.

The piston can be spring loaded with a shock absorber. A shock absorber can be installed between the piston and the pressure plate. The shock absorber can be made of rubber.

The essence of the utility model is illustrated in the drawings of FIG. 1 ... 3, where:

- in FIG. 1 shows the device assembly

- in FIG. 2 shows the electrical inputs of the electric detonator,

- in FIG. 3 shows a diagram of the installation of the device in the well.

Conventions used in the description:

1. - cable head,

2. - the central core of the cable,

3. - a conical rubber cuff,

4. - central contact,

5. - isolation,

6. - housing

7. - means for moving the central contact,

8. - the piston,

9. - shock absorber,

10. - a needle

11. - electric detonator,

12. - booster,

13. - top sub,

14. - washer,

15. - detonating cord,

16. -tube

17. - clamping washer,

18. - rubber washer,

19. - the sleeve of the frame,

20. - housing perforation system,

21. - the detonator body,

22. - central electrical input,

23. - side electric input,

24. - insulator,

25. - electric bridge,

26. - hole

27. - a dielectric film,

28. - punch,

29. - well,

30. - productive layer.

31. - geophysical cable,

32. - explosive machine.

The device (Fig. 1 ... 3) consists of a cable head 1, inside which passes the central core of cable 2, electrically connected to the central contact 4. In the housing 6 there is a means for moving the movable contact 7 in the form of a piston 8. The piston 8 is spring-loaded with a shock absorber 9. Inside of the piston 8, a central contact 4 is installed, which is electrically isolated over the entire length by an insulator 5. A central core of cable 2 is attached to the top of the central contact 4, on which a conical rubber sleeve 3 is put on, which ensures tightness the central contact 4, then a cable head 1 is screwed to the housing 6. There is a needle 10 at the bottom of the central contact 4. The device is screwed to the upper sub 13, into which the electric detonator 11 is installed, having a central electric input 23 sealed with a dielectric film 27 (Fig. 2 ), the gap between the needle 10 and the central electric input 23 of the electric detonator 11 is provided by a shock absorber 9 made of rubber (Fig. one). A tube 16 is installed on the sleeve of the carcass 19 of the perforation system, through which passes the detonating cord 15, which extends beyond the edge of the tube 16. A washer 14 is installed on the detonating cord 15, a booster 12 is installed on the remaining protruding part of the detonating cord 15 and fixed. The upper sub 13 is attached to the housing of the perforation system 20, while the entire assembly: the tube 16, the detonating cord 15, the washer 14 and the booster 12 enter the lower hole of the upper sub 13.

The booster 12 rises relative to the electric detonator 11 in the center, the washer 14 has an opening smaller than the diameter of the booster 12, which does not allow the booster 12 to move when the electric detonator 11 is triggered, since the washer 14 is mounted on the tube 16.

In FIG. 2 shows a diagram of a connection to an electric detonator 11.

The electric detonator 11 (Fig. 2) comprises a detonator body 21, a central electric input 22, a side electric input 23 separated by an insulator 24, an electric bridge 25 connecting the electric inputs 22 and 23.

The electric inputs 22 and 23 are installed in the housing 21, more precisely in the hole 26, made in the center along the axis, and closed by a dielectric film 27. The electric detonator 11 is installed in a perforator 28 (Fig. 3), which is lowered into the well 29 in the region of the reservoir 30 at the geophysical cable 31 and attached to the explosive device 32.

DEVICE OPERATION

When the perforator 28 is lowered into the well 29 (Fig. 3) at a certain pressure of the well fluid, the piston 8 (Fig. 1) begins to move, compressing the shock absorber 9. The needle 10 pierces the dielectric film 27 (Fig. 2) and abuts against the central electric input 22 of the detonator 11 , providing good electrical connection with the Central contact 4 (Fig. 1). Ground contact is provided by the pressure washer 17. The tight compression of the pressure washer 17 is provided by the rubber washer 18 (Fig. 1). Such connection of the electric detonator 11 to the electric circuit outside the wellhead 29, i.e., not on the surface, but in the well 29 itself, reduces the accident rate of sighting and blasting operations.

To activate the punch 28, an electric impulse is supplied to it from an explosive device 32 (Fig. 3).

In case of failure of the electric detonator 11 in the well 29 during the rise, the pressure of the borehole fluid decreases, the shock absorber 9 moves the piston 8 with the needle 10 to its original state, breaking the electric circuit. This will ensure the passage of a random electrical signal to the electric detonator 11.

Application of the utility model allowed:

- to provide more reliable protection of the perforator for oil and gas wells from unauthorized initiation of charges of the perforator,

- simplify the design of the device.

Claims (6)

1. A device for protecting a cumulative rotary hammer from unauthorized initiation, comprising a housing, a cable head, in which a central core of a cable is mounted, to which a central contact, made movable, means for moving the central contact, an electric detonator with a central current lead, characterized in that at the end of the central contact the needle is made, and the means for moving the central contact is made in the form of a spring-loaded piston, inside which a central contact is installed, which electrically isolated from the piston over the entire length. 2. The device for protecting a cumulative punch from unauthorized initiation according to claim 1, characterized in that a conical rubber sleeve is put on the central core of the cable, which ensures the tightness of the central contact of the initiating module. 3. The device for protecting a cumulative punch from unauthorized initiation according to claim 1, characterized in that the central electric input of the electric detonator is sealed with a dielectric film. 4. The device for protecting a cumulative rock drill from unauthorized initiation according to any one of paragraphs. 1-3, characterized in that the piston is spring loaded with a shock absorber. 5. The device for protecting a cumulative hammer from unauthorized initiation according to claim 4, characterized in that the shock absorber is installed between the piston and the pressure plate. 6. The device for protecting a cumulative rock drill from unauthorized initiation according to claim 4, characterized in that the shock absorber is made of rubber.

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