Cumulative device for a well

FIELD: mining industry.

SUBSTANCE: device has collapsible body of at least two portions. These are held relatively to one another, have a combined axial channel and together form a hermetic ring-shaped hollow. Therein a ring-shaped cumulative charge is placed with pressed explosive substance in metallic case in form of a torus, having outer ring-shaped recess. Opposite to the latter body is made with lesser thickness of outside wall. Body has at least one inner radial channel, connecting ring hollow to axial channel. In this axial channel a means for initiating ring-shaped cumulative charge through radial channel is positioned. Portions of body are mated by ends adjacently to each other and made with possible exclusion of strains from axial loads in zone of outer wall of decreased thickness under well conditions.

EFFECT: higher reliability and efficiency.

3 dwg

 

The invention relates to the field of mining industry, and particularly to a device for influencing the borehole wall in the open hole to increase the surface of the filter and the intensification of fluid flow in producing wells, the increase in injection wells tapping of producing formations in cased wells, as well as cutting the pipe in wells. Thus the well, which can be applied to the device in accordance with the present invention, may be for various purposes, such as oil or gas, or water.

Known cumulative device for wells including durable sealed housing with a bottom and an annular shaped charge with a means of blasting (see, for example, U.S. Pat. U.S. No. 3192857, 06.07.1965).

The known device has the following disadvantages:

- low reliability of the device, which is manifested in the frequent cases of incomplete circular actions cumulative jet;

- the need for a large mass of explosive charge for the circular steps of the cumulative jet, leading to unwanted amplification of high-explosive impact of the charge;

- restrictions on the depth of application.

The technical result of the invention is to improve the reliability of the device by increasing the stability of the frame from uznogo thrashing pressure and increasing the efficiency of the device by providing a circular action of the jet, with a simultaneous increase its range and reduced fragmentation effect in reducing the mass of the charge.

Required technical result is achieved by the fact that the cumulative device for a well includes an Assembly housing, at least two parts, fixed relative to each other, have combined between an axial channel and forming between them a sealed annular cavity in which is placed an annular shaped charge with the extruded explosive in a metal shell in the form of a torus having an outer annular recess, against which the body is made with a reduced thickness of the outer wall, the housing has one, at least, the internal radial channel that connects the annular cavity with an axial channel that hosts the tool to initiate the ring-shaped charge through a radial channel, and part of the body associated with their ends close to each other and are designed to eliminate stress from axial loads in the zone of reduced thickness of the outer wall in the conditions of the well.

In addition:

ring shaped charge is made with the following proportions:

D=(2,2-2,5)L,

N=(0,25-0,35)D

S=(0,08-0,11)D

where D is the diameter of a circle describing the cross-section of charge, mm;

L is the depth of cut of cumulative jet, mm;

N is the cumulative depth of cut, mm;

S - thickness of the metal shell, mm;

- part housing vypolnenye-shaped, telescopically entering into each other, with an annular cavity formed due to the outer end of the turning of the lower part of the body, which has a radial channel and the center channel is made hollow, with a reduced thickness of the outer wall has an upper part of the body, which is made with a through axial channel;

- as a means to initiate the ring-shaped charge adopted the detonator, with a radial channel filled with solid or liquid explosive;

shell ring shaped charge is made of copper and filled with RDX, pressed to a density of 1.6 g/cm3;

the housing has two radial channel, made for each other diametrically, with each of the channels filled with solid or liquid explosive;

- conjugate part of the case is made from a material having the same coefficient of thermal expansion.

For normal operation of the shaped charge is provided by the execution part of the body located opposite charge, with the minimum required (reduced) wall thickness. In a deep well with high hydrostatic pressure specified weakened area of the body affected, together with the current stresses from the outer thrashing pressure and axial loads of different nature. Resistance the from thrashing external pressure decreases with increase in the diameter of the body and especially sharply reduced in the presence of concurrent stresses due to axial loads. In some cases, these stresses are caused by multiple reduce the stability of the frame from the outside thrashing pressure.

To ensure the claimed technical effect of the hull is designed in such a way that they are paired with their ends close to each other, which greatly reduces the possibility of the development of stresses due to axial loads in the zone of reduced thickness of the outer wall at down hole conditions. In addition, the mated housing parts are made of material having the same coefficient of thermal expansion. This ensures consistency of temperature deformation and prevents interaction between the parts of the body. In addition, the device eliminated the possibility of mechanical interaction between the housing parts relative to each other in the initial (valid) deformation of the casing from the outer thrashing pressure.

In respect of cumulative effects determined experimentally that the range of cumulative jet significantly increased with the implementation of the annular shaped charge with the metal shell in the form that is the Torah. The mass of the charge in such form, in comparison with conventional charges, can be reduced. Reliability (continuity) circular actions cumulative jet provided that chick is atiny charge made of pressed explosives. The above ratio of the size of the ring shaped charge to ensure the most optimal performance of the device.

Figure 1 shows a General view of the device; figure 2 - geometric dimensions of the shaped charge; figure 3 - dependence, confirming the optimum ratio of size of the shaped charge.

The device includes a split housing, at least two connected parts, made for example of U-shaped, members telescopically into each other. One of them, for example the upper part 1, is connected with the suspension device, for example, a cable (not shown) through the adapter 2. The lower part 3 of the casing is fixed, for example, by screws 4 to the upper part 1 of the housing. The upper part 1 of the case is made with a through axial channel 5. The lower part 3 of the case is made with a blind axial channel 6, combined with the axial channel 5. The upper part 1 and lower part 3 of the housing form a sealed annular cavity in which is placed an annular shaped charge 7 with the metal shell in the form of a torus. This shell has an outer annular recess 8. Against it the case, for example, in the upper mating portion 1 is made with a reduced thickness of the outer wall 9. The housing has one, at least, the internal radial channel filled with explosive 10. This channel is Olsen, for example, in the lower part 3 of the housing. This channel connects the annular cavity in which is placed an annular shaped charge 7 with an axial channel 6 that hosts the tool, for example, in the form of detonator 11 to initiate the ring-shaped charge 7 through the radial channel 10 of the housing. For this radial channel 10 filled with liquid or solid explosive. The coupling parts 1, 3 corps carried out with exclusion of stresses due to axial loads in the zone of reduced thickness of the outer wall 9 under the action of hydrostatic and thermal loads on the body in terms of the well. To do this, paired parts of the body made, for example, from a material having the same coefficient of thermal expansion. In addition, by performing, for example, the lower part of the body with reinforcing belt 12 in the lower part of the required gap "δ" between this zone and the nearest element of the upper part 1 of the housing a sufficient size to prevent interaction between them in well with the initial conditions (valid) deformation from external pressure. In addition, figure 1 shows the sealing elements 13 for sealing the annular cavity with a circular shaped charge 7. For sealing a through axial channel 5 for the detonator 11 is a ger is owed 14, which is fixed in the cap 15. The screws 16 are used to connect to the sling (cable).

Figure 3 shows the experimentally obtained dependence for the ring shaped charge with the metal shell in the form of a torus made of copper and filled with pressed RDX density of 1.6 g/cm3. It is established that for a ring shaped charge containing an explosive substance and a metal sheath, made in the form of a torus (see figure 2), the range of the jet (cutting depth) depends on the outer diameter of the circle describing the cross-section of the charge, the cumulative depth of cut and thickness of the metal shell. The results are shown for pipes. Shaped charges have experienced on a steel pipe with a tensile strength of 50-100 kg/mm2. This range covers virtually the entire range of steel pipe used in wells. On the basis of the received data to achieve optimal results in the range of cumulative jets (depth of cut) were identified previously mentioned ratios:

D=(2,2-2,5)L,

N=(0,25-0,35)D

S=(0,08-0,11)D.

The device operates as follows.

At the desired depth from a pulse of electric current supplied from the surface, triggered the detonator 11, detonation from it is passed by an explosive charge 10 to lavau cumulative charge 7. Upon detonation of the latter is formed flat cumulative jet, which, along with its radial displacement from the axis of the first device cuts the wall of the housing 9 with a reduced thickness, and then, moving on, the effect on the open wall of the well or pipe which is placed in the device.

The device, made in accordance with the invention, allows you to:

- to increase the allowable hydrostatic pressure in 1,5-2 times (for example, for a device with a diameter of 118 mm - 65 MPa to 130 MPa);

to improve significantly the reliability of circular cumulative actions of the jet with the effective and equal range;

to reduce the weight of the explosive charge.

To confirm the last sentence in the below table shows the weight of the explosive in some sizes of devices made in accordance with the invention, and the same size of the existing devices.

Outer diameter of pipe, mm139,7168178194219244,5
Weight of explosive charge, gAn existing device100240253-280253373407
The device according to the invention63808795100120

The comparison shows that the weight of the explosive in a cumulative charge device according to the invention for pipes with an outer diameter of 168 mm and more than three times smaller than existing devices for the same size pipe. Hence, the apparent significant reduction side fragmentation effect of the charge in the device according to the invention.

1. Cumulative device for wells comprising an Assembly housing, at least two parts, fixed relative to each other, have combined between an axial channel and forming between them a sealed annular cavity in which is placed an annular shaped charge with the extruded explosive in a metal shell in the form of a torus having an outer annular recess, in front of which the body is made with a reduced thickness of the outer wall, the housing has one, at least, the internal radial channel that connects the annular cavity with an axial channel that hosts the tool to initiate the ring-shaped charge through the radial channel, and part of the body associated with their ends close to each other and are designed to eliminate stress from settling the x loads in the zone, the reduced thickness of the outer wall in the conditions of the well.

2. Cumulative device under item 1, characterized in that the annular shaped charge is made with the following proportions:

D=(2,2-2,5)L;

N=(0,25-0,35)D;

S=(0,08-0,11D,

where D is the diameter of a circle describing the cross-section of charge, mm;

L is the depth of cut of cumulative jet, mm;

N is the cumulative depth of cut, mm;

S - thickness of the metal shell, mm

3. Cumulative device according to claim 1, characterized in that part of the body is U-shaped, members telescopically into each other, with an annular cavity formed due to the outer end of the turning of the lower part of the body, which has a radial channel and the center channel is made hollow, with a reduced thickness of the outer wall has an upper part of the body, which is made with a through axial channel.

4. Cumulative device according to claim 1, characterized in that as a means to initiate the ring-shaped charge adopted the detonator, with a radial channel filled with solid or liquid explosive.

5. Cumulative device according to claim 1 or 2, characterized in that the shell ring shaped charge is made of copper and filled with RDX, pressed to a density of 1.6 g/cm3

Canulation device according to claim 1, characterized in that the housing has two radial channel, made for each other diametrically, with each of the channels filled with solid or liquid explosive.

7. Cumulative device according to claim 1, characterized in that the mated housing parts are made of material having the same coefficient of thermal expansion.



 

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