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Perforating bullet

A perforating charge, a new type of technology, applied in the direction of mining fluid, wellbore/well components, earthwork drilling and production, etc., can solve the problem of loss, achieve the effect of enhancing the force and reducing the loss of flight

Inactive Publication Date: 2008-09-10
INST OF APPLIED PHYSICS & COMPUTATIONAL MATHEMATICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, most of the kinetic energy of the explosion product does not directly act on the drug-type cover to press the cover, but acts outward along its moving direction and is lost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] At present, the design of perforating charges is mainly completed through theoretical analysis, numerical simulation and experiment, and numerical simulation is more and more valued by domestic and foreign perforating charge manufacturers because of its short cycle and low cost. The numerical simulation program used in this embodiment is a two-step Euler program, and the problems that can be simulated include:

[0045] (1) Detonation issues such as the formation, propagation and interaction with other media of detonation waves;

[0046] (2) Matter movement issues such as the formation, movement, extension, and fracture of jets under high temperature and high pressure;

[0047] (3) Penetration of the target by the jet, crater formation and dynamic response of the target;

[0048] Therefore, it is more suitable to simulate the perforation problem of petroleum projectiles.

[0049] As a comparison between the checksum of the calculation program and the test results, the ...

Embodiment 2

[0060] The feature of shaper in the present invention:

[0061] The effect of adding a shaper is to effectively hinder the propagation of detonation waves. When the detonation wave hits the shaper, a shock wave will be generated inside the device, and the velocity and pressure of the shock wave should be as low as possible, so as to delay the time for the detonation wave to reach the bottom of the shaper and ensure the explosion in the booster channel. The blast wave reaches the interface of the main charge first; the low pressure can reduce the probability of the shock wave accidentally detonating the main charge. Ensure ring detonation of the main charge.

[0062] According to the above requirements, the material of the shaper should be an inert substance with low density and low sound velocity, and must have a certain strength to ensure that the shaper will not be crushed when the explosive is loaded in the whole bomb production. Low density means that the density is lower...

Embodiment 3

[0068] The numerical simulation results of the new perforating charges of different projectile types are given below, and the numerical simulation results of the corresponding traditional perforating charges without shapers are also given for comparison, as shown in Table 3.

[0069] Table 3 lists the values ​​of the important parameters of the jet part obtained from the numerical simulation, and -M in the model code in the table indicates a new type of perforating charge with a shaper installed. For example, D01 is a traditional perforating bullet, while D01-M is a new type of perforating bullet with a shaper added to the D01 bullet.

[0070] The physical meaning of each symbol in the table is as follows: U-jet head velocity, M-jet mass, Z-jet length, E K - jet kinetic energy, L - jet penetration depth of concrete target, η = E K M / E K - Kinetic energy ratio of old and new perforating charges, ξ=L M / L-the ratio of the penetration depth of the old and new perforating cha...

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Abstract

The invention belongs to the petroleum production field and in particular relates to a novel perforating bullet. The perforating bullet is based on the prior perforating bullet; the bullet is inside provided with a detonation wave reshaper which effectively blocks the transmission of a detonation wave, delays the time for transmitting the detonation wave to the bottom of the reshaper and ensures that the detonation wave in a booster explosive channel can firstly reach a main interface in order that the detonation wave generated in main explosive can effectively act on a shaped charge liner, thereby improving the utilization rate of explosive energy, increasing the speed, quality and kinetic energy of the shooting flow, strengthening perforation capacity so that the perforating depth of the oil well is deeper.

Description

technical field [0001] The invention belongs to the field of petroleum production, and in particular relates to a novel perforating bullet. technical background [0002] Now the oil production in various oil fields is to place a series of perforating bullets from top to bottom in the drilled oil wells (generally 13-16 rounds per meter of length, and the phases are different, such as figure 1 As shown in Figure 1, the metal jet produced by the explosion of perforating charges is used to shoot a series of deep holes on the well wall, after which the oil well begins to produce oil. The higher the energy and the greater the speed of the jet, the deeper the hole will be penetrated, and the higher the oil yield of the oil well will be. Therefore, the link of perforation is very important to oil recovery, and the petroleum department compares it to the last "finishing kick" in the whole process of oil production. Perforation depth has become an important index to evaluate the per...

Claims

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Application Information

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IPC IPC(8): E21B43/119
Inventor 李维新冯其京郝鹏程何长江杭义洪陈贤林
Owner INST OF APPLIED PHYSICS & COMPUTATIONAL MATHEMATICS
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