A coaxial follow-up multi-stage enhancement body for perforating

Abstract

The present invention discloses a coaxial follow-up multi-stage synergist for perforating, the coaxial follow-up multi-stage synergist comprises: a bowl-shaped shell with a hole at the bottom; a synergist, the synergist is arranged in the bowl-shaped shell; a variable diameter adapter ring, one end of the variable diameter adapter ring is matched and connected with the bowl-shaped shell; an explosion height adjustment ring, the explosion height adjustment ring is matched and connected with the other end of the variable diameter adapter ring, the explosion height adjustment ring is used to adjust the best explosion height after the perforator barrel and the perforating bullet involved in use are assembled. The present invention enables the synergist to be broken more evenly, so that it can be brought into the perforating channel in the maximum amount, so that the limited agent energy can be released in the formation channel to the maximum extent; the agent energy release speed forms the best match with the jet to achieve the best effect; a small diameter perforating bullet can also use a synergist with a larger amount of medicine; when used in conjunction with perforating bullets of different models, the explosion height design of the bullet can be met by adjusting the assembly.

Description

Technical Field

[0001] The invention relates to the field of enhanced perforation, and in particular to a coaxial advancing multi-stage enhanced body used for perforation. Background Art

[0002] In order to enhance the effect of perforating in oil and gas wells, various forms of composite perforating have emerged. In these composite perforating technologies, basically, agents are added to the gap in the barrel or medicine cakes are added to the front end of the perforating bullet. However, the explosion of the medicine in the barrel causes a sudden increase in pressure, which greatly increases the risk of gun explosion. If the amount of medicine is reduced, it will hardly help to improve the effect of perforating. The medicine directly placed at the front end of the perforating bullet will interfere with the jet, and the effect may even be negative. There are also sleeves that are made of medicine and added to the outside of the barrel. This method eliminates the problems of excessive barrel expansion and gun explosion, but the medicine is directly immersed in the well fluid, and a water-resistant formula is required and the medicine is waterproofed. At the same time, during the drilling process, the sleeve-type medicine collides and rubs with the casing, so it may be destroyed or even accidentally ignited, causing engineering safety accidents. Summary of the invention

[0003] In order to solve the above-mentioned problem that the high pressure generated by the combustion of the synergist in the gun barrel causes the expansion diameter to exceed the standard and even the gun to explode, the present invention provides a coaxial follow-up multi-stage synergist for perforating.

[0004] To achieve the above object, the technical solution of the present invention is as follows:

[0005] A coaxial multi-stage synergist for perforating, the coaxial multi-stage synergist comprising:

[0006] a bowl-shaped shell with a hole in the bottom;

[0007] A synergistic agent, wherein the synergistic agent is arranged in a bowl-shaped shell;

[0008] A diameter reducing adapter ring, one end of which is matched and connected with the bowl-shaped shell;

[0009] The explosion height adjustment ring is matched and connected with the other end of the variable diameter adapter ring, and the explosion height adjustment ring is used to adjust the optimal explosion height after the perforator barrel and the perforating bullet involved in use are assembled.

[0010] In a preferred embodiment of the present invention, an opening is provided at the center of the bottom of the bowl-shaped shell, 3 to 12 radial thin-wing separators are evenly distributed inside the bowl-shaped shell, and the wall thickness of the radial thin-wing separators is 0.1 to 5.0 mm.

[0011] In a preferred embodiment of the present invention, the synergistic agent is a composite layer of at least two layers.

[0012] In a preferred embodiment of the present invention, the synergistic agent includes a low burning rate layer, a medium burning rate layer and a high burning rate layer.

[0013] In a preferred embodiment of the present invention, the synergistic agent is provided with 3 to 12 cutouts, and each cutout corresponds to a radial thin wing separator.

[0014] In a preferred embodiment of the present invention, the reducer adapter ring is in the shape of a ring cylinder, and includes an external stop step and an internal stop step. The outer diameter of the external stop step matches the large inner diameter of the bowl-shaped shell, and the inner diameter of the internal stop step matches the outer diameter of the perforating bullet when in use.

[0015] In a preferred embodiment of the present invention, the explosion height adjustment ring is in the shape of a ring column, the axial cross-section of the explosion height adjustment ring can be of any shape, the maximum outer diameter of the explosion height adjustment ring is smaller than the inner diameter of the opening of the bowl-shaped shell, and the minimum diameter of the inner wall of the explosion height adjustment ring is not less than the inner diameter of the opening edge of the perforating bullet involved in use.

[0016] In a preferred embodiment of the present invention, the bowl-shaped housing and the reducer adapter ring are reinforced with a high temperature resistant adhesive.

[0017] The beneficial effects of the present invention are:

[0018] The invention solves the problem of the interference of the agent on the jet; the synergistic agent can be broken more evenly, so that it can be brought into the perforating channel in a maximum amount, and the limited agent energy can be released in the formation channel to the maximum extent; the agent energy release speed is optimally matched with the jet to achieve the best effect; a large amount of synergistic body can be used for a small-diameter perforating bullet; when used in conjunction with perforating bullets of different models, the explosion height design of the bullet can be met by adjusting the assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 This is a schematic diagram of the structure of the large opening end of the present invention;

[0021] Figure 2 It is a structural schematic diagram of the bottom opening end of the present invention;

[0022] Figure 3 A semi-transparent view of the present invention;

[0023] Figure 4 A top view of the present invention;

[0024] Figure 5 for Figure 4 Cross-section view in the AA direction;

[0025] Figure 6 An exploded view of the present invention;

[0026] Figure 7 It is a schematic diagram of the assembly of the present invention and the perforating bullet when used.

[0027] Description of reference numerals:

[0028] 1. Bowl-shaped shell, 2. Synergistic agent, 3. Variable diameter adapter ring, 4. Explosion height adjustment ring, 11. Opening, 12. Radial thin wing separator, 21. Agent cutout, 22. Agent conical surface, 23. Low burning rate layer, 24. Medium burning rate layer, 25. High burning rate layer, 31. External stop step, 32. Internal stop step. DETAILED DESCRIPTION

[0029] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below.

[0030] See also Figure 1-7 The coaxial follow-up multi-stage enhancement body for perforating provided by the present invention comprises a bowl-shaped shell 1 with a hole at the bottom, an enhancement agent 2, a variable diameter adapter ring 3 and a blasting height adjustment ring 4.

[0031] The material of the bowl-shaped shell 1 can be metal, plastic or rubber. Preferably, fiber-reinforced nylon is selected, which has the best cost-effectiveness. The bowl-shaped shell 1 can be any curved surface or conical surface. Preferably, it is a combination of a spherical surface and a cylindrical surface.

[0032] An opening 11 is provided at the center of the bottom of the bowl-shaped shell 1 , and 3 to 12 radial thin-wing separators 12 are evenly distributed inside the bowl-shaped shell 1 . The wall thickness of the radial thin-wing separators 12 is 0.1 to 5.0 mm.

[0033] The height of the radial thin wing separators 12 on the bowl-shaped shell 1 can be from 0 to the conical surface that passes through the synergistic drug 2. The upper edge of the radial thin wing separators 12 is parallel to the generatrix of the conical surface of the synergistic drug 2 and is 2 mm below the drug surface. The specific number of the radial thin wing separators 12 can be 6 to 8.

[0034] The diameter of the opening 11 at the bottom of the bowl-shaped shell 1 is greater than 10 mm, preferably, greater than 60% of the diameter of the opening end of the perforating bullet used in conjunction with it.

[0035] Specifically, the outer diameter of the cylindrical section of the bowl-shaped shell 1 is 62 mm, the spherical radius is 50 mm, the wall thickness is 1.5 mm, the bottom opening 11 has a diameter of 25 mm, and 8 radial thin wing separators 12 are used, and the thickness is specifically 0.5 mm.

[0036] The present invention leaves openings 11 with sufficiently large diameters in the bowl-shaped shell 1 and the synergistic agent 2, thereby avoiding interference with the jet. The high temperature and high pressure formed by the explosives and the local negative pressure formed by the high-speed jet work together to break the synergistic agent 2 and bring it into the formation channel along the jet axis to form a deflagration, which is superimposed with the jet tail pressure to perform secondary work, thereby significantly improving the perforating effect and reducing the expansion diameter of the barrel.

[0037] The cone angle of the synergistic agent 2 can be 0°~180°, preferably, the cone angle of the agent is 100°~120°, the symmetry axis of the cone coincides with the bowl-shaped shell 1, there can be more than two agent cuts 21 thereon, and the depth can be from 0 to through the agent, preferably, the number of agent cuts 21 is equal to the number of radial thin-wing separators 12, the position phase is exactly staggered with the radial thin-wing separators 12 by half a cycle, and the bottom of the agent cut 21 is parallel to the generatrix of the agent conical surface 22, and the distance is 5~10 mm.

[0038] The synergistic agent 2 is a composite layer of at least two layers, specifically three layers, namely a low burning rate layer 23, a medium burning rate layer 24 and a high burning rate layer 25, and the weight of the three layers is inversely proportional to their burning rates. The cone angle of the conical surface 22 of the agent is 110°. The initial state of the agent after being made is a loose powder mass containing a certain amount of glue, which is pressed into a bowl-shaped shell by a mold, and then solidified after a period of time to finally form. After the agent is formed, a special tool is used to press and cut the incision.

[0039] The present invention makes the agent fragmentation more uniform through the design of the radial thin wing partition sheet 12 and the agent cutout 21 on the synergistic agent 2, which is more conducive to the formation of the agent fragments along the axial direction of the channel.

[0040] Furthermore, by configuring the synergistic agent 2 to be a combination of multiple layers of agents with different burning rates from low to high, the agents that are first impacted by the explosives and the jet will generate a smaller pressure in the barrel, and although there is a certain time difference in entering the formation after being broken, they will eventually explode in the formation to produce the best working effect.

[0041] The material of the reducer adapter ring 3 can be metal, plastic or rubber, preferably, the same material as the bowl-shaped housing 1, which can improve the overall quality.

[0042] The connection between the reducer adapter ring 3 and the bowl-shaped shell 1 can be achieved by a butt-jointed ring method or a sleeve method. Preferably, an external stop sleeve method is adopted: the reducer adapter ring 3 is an annular column, which includes an external stop step 31 and an internal stop step 32. The outer diameter of the external stop step 31 matches and sleeves with the large inner diameter of the bowl-shaped shell 1, and the inner diameter of the internal stop step 32 matches and sleeves with the outer diameter of the perforating bullet when in use, or matches with the charge height adjustment ring 4 and the perforating bullet at the same time.

[0043] The sleeve interface between the reducer adapter ring 3 and the bowl-shaped shell 1 is reinforced with adhesive, which may be acrylic adhesive, silicone, hot melt adhesive, cyanoacrylate, epoxy resin, silane-modified polymer, polyurethane, silicone or anaerobic adhesive. Preferably, high temperature resistant silicone is used.

[0044] The present invention can make the diameter of the bowl-shaped shell 1 larger by adopting the variable diameter adapter ring 3, which is beneficial to expand the opening 11 to eliminate interference, and at the same time can have a larger medicine filling amount to ensure the energy level.

[0045] The explosion height adjustment ring 4 is in the shape of a ring column, and its axial cross section can be of any shape. Its maximum outer diameter is smaller than the inner diameter of the opening of the bowl-shaped shell 1, and its minimum inner wall diameter is not smaller than the inner diameter of the opening edge of the perforating bullet involved in use. It is used to adjust the optimal explosion height after the perforator barrel and the perforating bullet are assembled during use.

[0046] The present invention adopts the variable diameter adapter ring 3 and the explosion height adjustment ring 4 for use in combination, which can be more conveniently used with perforating bullets of different diameters.

[0047] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A coaxial follow-up multi-stage enhancement body for perforating, characterized in that: The coaxial progressive multi-stage enhancement body comprises: a bowl-shaped shell with a hole in the bottom; A synergistic agent, wherein the synergistic agent is arranged in a bowl-shaped shell; A diameter reducing adapter ring, one end of which is matched and connected with the bowl-shaped shell; A burst height adjustment ring, which is connected to the other end of the variable diameter adapter ring and is used to adjust the best burst height after the perforator barrel and the perforating bullet are assembled during use; An opening is provided at the center of the bottom of the bowl-shaped shell, and 3 to 12 radial thin-wing separators are evenly distributed inside the bowl-shaped shell, and the wall thickness of the radial thin-wing separators is 0.1 to 5.0 mm; The synergistic agent is provided with 3 to 12 cutouts, and each cutout is matched with a radial thin wing separator.

2. The coaxial progressive multi-stage enhancement body for perforating according to claim 1, characterized in that: The synergistic agent is a composite layer of at least two layers.

3. The coaxial advancing multi-stage enhancement body for perforating according to claim 2, characterized in that: The synergistic agent includes a low burning rate layer, a medium burning rate layer and a high burning rate layer.

4. The coaxial progressive multi-stage enhancement body for perforating according to claim 1, characterized in that: The reducer adapter ring is in the shape of a ring cylinder and includes an outer stop step and an inner stop step. The outer diameter of the outer stop step matches and fits with the large inner diameter of the bowl-shaped shell, and the inner diameter of the inner stop step matches and fits with the outer diameter of the perforating bullet when in use.

5. The coaxial advancing multi-stage enhancement body for perforating according to claim 1, characterized in that: The bowl-shaped shell and the diameter-changing adapter ring are reinforced and connected by a high-temperature resistant adhesive.

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