Programming type multipoint wireless perforation device driven by multi-frequency electromagnetic waves

Abstract

A programming type multipoint wireless perforation device driven by multi-frequency electromagnetic waves comprises a ground excitation unit and a plurality of underground perforation units. And the ground excitation unit is arranged on the ground, comprises a programming host and is connected with a plurality of electromagnetic wave excitation antennas of which the bottom ends are inserted into the bottom layer. The underground perforation units sequentially sleeve the tail end of the oil pipe in an array mode in the axis direction of the horizontal part of the oil pipe, each underground perforation unit comprises an electromagnetic wave demodulation detonating assembly, and electromagnetic wave collecting probes are arranged at the two ends of each electromagnetic wave demodulation detonating assembly respectively. Perforating guns electrically connected with the electromagnetic wave demodulation detonating assembly are further arranged at the end, close to the tail end of the oil pipe, of the electromagnetic wave collecting probe, if different perforating guns need to detonate at the same time, different underground perforating units are excited by the same electromagnetic wave frequency, and if different perforating guns need to detonate in a time-sharing mode, different underground perforating units are excited by the same electromagnetic wave frequency. And different underground perforation units are excited by different electromagnetic wave frequencies at different times. According to the utility model, the uncertainty caused by a mechanical detonation mode can be reduced, and the perforation success rate is improved.

Description

Technical Field

[0001] The utility model relates to the field of perforation in downhole oil and gas operations, in particular to a programmable multi-point wireless perforation device driven by multi-frequency electromagnetic waves. Background Art

[0002] Tubing conveyed perforation is the main technology in current perforation construction. That is, the perforator string for perforating the oil and gas layers to be perforated in a well is connected to the end of the tubing string, forming a rigidly connected pipe string and lowered into the well to perforate all intervals at one time. The success rate of its perforation depends on the reliability of the initiation technology. Currently, the main initiation technologies are drop bar impact and wellhead pressurization.

[0003] However, these two initiation methods are easily affected by the quality of equipment, on-site assembly, and well conditions. If there may be a lot of dirt, rust, and a large amount of iron filings on the tubing used on site, these sediments may block the upper end of the initiator, resulting in the mechanical actions such as drop bar impact or wellhead pressurization being unable to be effectively transmitted to the initiator, and then misfiring; in addition, the failure of tubing sealing may cause leakage inside the tubing, making the wellhead pressure unable to be effectively transmitted to the initiator, which may also cause misfiring; furthermore, affected by other human factors such as downhole debris, there is also a risk of accidental initiation before the perforating gun is delivered to the predetermined position.

[0004] The above accidental conditions such as misfiring and misfiring will directly affect the evaluation and development of oil and gas reservoirs, and may even lead to wellbore abandonment in severe cases. For the non-initiated perforator, there are relatively high safety risks during the tubing pulling and disassembly at the wellhead. Therefore, an efficient and stable initiation perforation device is the key to ensuring perforation quality and improving the effect of oil and gas development. Summary of the Utility Model

[0005] In view of the above defects, the utility model provides a programmable multi-point wireless perforation device driven by multi-frequency electromagnetic waves, which can reduce the uncertainty brought by the mechanical initiation method and effectively improve the perforation success rate.

[0006] In order to achieve the purpose of the utility model, the following technologies are proposed:

[0007] A programmable multi-point wireless perforation device driven by multi-frequency electromagnetic waves, comprising:

[0008] A ground excitation unit, which is arranged on the ground and includes a programming host connected with a plurality of electromagnetic wave excitation antennas with the bottom ends inserted into the ground layer;

[0009] Multiple downhole perforating units are sequentially sleeved on the end of the tubing along the axis direction of the horizontal part of the tubing. Each downhole perforating unit includes an electromagnetic wave demodulation initiation component. Electromagnetic wave acquisition probes are respectively arranged at both ends of the electromagnetic wave demodulation initiation component. A perforating gun electrically connected to the electromagnetic wave demodulation initiation component is further arranged at one end of the electromagnetic wave acquisition probe close to the end of the tubing. If the perforating guns of different downhole perforating units are to be detonated simultaneously, different downhole perforating units are excited by the same electromagnetic wave frequency. If the perforating guns of different downhole perforating units are to be detonated at different times, different downhole perforating units are excited by different electromagnetic wave frequencies at different times.

[0010] Further, the number of electromagnetic wave excitation antennas is two.

[0011] Further, the detonation electromagnetic wave frequency emitted by the electromagnetic wave excitation antenna is lower than 1000 Hz.

[0012] Further, the number of downhole perforating units is two.

[0013] Further, insulators are respectively arranged between both ends of the electromagnetic wave demodulation initiation component and the two electromagnetic wave acquisition probes.

[0014] Further, several through holes are formed in the insulator along the direction parallel to the axis of the horizontal part of the tubing, and the wires of the electromagnetic wave acquisition probe pass through the through holes to connect the electromagnetic wave demodulation initiation component.

[0015] Further, the electromagnetic wave frequency for exciting the downhole perforating unit is the detonation frequency. The electromagnetic wave demodulation initiation component includes a single-chip microcomputer, an analog-to-digital acquisition module, and a band-pass filter. The single-chip microcomputer presets a detonation threshold. The single-chip microcomputer acquires the voltage signals on the electromagnetic wave acquisition probes located at both ends of the electromagnetic wave demodulation initiation component through the analog-to-digital acquisition module, demodulates and analyzes the amplitude of the voltage signal corresponding to the detonation frequency after filtering through the band-pass filter, and if the amplitude of the voltage signal is greater than the preset detonation threshold, detonates the corresponding perforating gun.

[0016] The beneficial effects of this technical solution are as follows:

[0017] It realizes remote driving of downhole perforating units for perforating operations through electromagnetic waves, reduces the uncertainty brought by mechanical detonation methods, effectively improves the perforating success rate, and ensures the exploitation effect of oil and gas reservoirs; and can realize simultaneous or time-sharing detonation of multiple perforating positions according to requirements, with strong versatility. Description of the Drawings

[0018] Figure 1 Shows the overall plan view of the embodiment of the present application.

[0019] Figure 2 Shows the schematic diagram of the positional relationship among the electromagnetic wave demodulation initiation component, the insulator, and the electromagnetic wave acquisition probe in the embodiment of the present application. Detailed implementation mode

[0020] To enable those skilled in the art to better understand the solution of this application, the following further detailed description of this application will be given in conjunction with the accompanying drawings and specific implementation modes. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the scope of protection of this application.

[0021] Such as Figures 1 to 2 shown, a programmable multi-point wireless perforating device driven by multi-frequency electromagnetic waves includes a ground excitation unit and a plurality of downhole perforating units 7.

[0022] The ground excitation unit is arranged on the ground and includes a programming host 9, which is connected with a plurality of electromagnetic wave excitation antennas 10 with the bottoms inserted into the formation. Specifically, the number of the electromagnetic wave excitation antennas 10 is two. The programming host excites the programmed electromagnetic wave signals into current signals in the formation through the two electromagnetic wave excitation antennas, generating a current field with a corresponding frequency in the whole formation. The detonation electromagnetic wave frequency emitted by the electromagnetic wave excitation antenna 10 is lower than 1000 Hz. Since the low-frequency electromagnetic wave has a strong penetration ability into the formation, a lower frequency is set to ensure that the electromagnetic waves excited by the ground excitation part can be stably received by the downhole perforating part.

[0023] In this embodiment, the number of downhole perforating units 7 is two, and they are sleeved on the end of the tubing 2 in an array along the axis direction of the horizontal part of the tubing 2 and are located inside the casing 1. The downhole perforating unit 7 includes an electromagnetic wave demodulation initiation assembly 5. Electromagnetic wave acquisition probes 4 are respectively arranged at both ends of the electromagnetic wave demodulation initiation assembly 5. In this embodiment, insulators 3 are also respectively arranged between both ends of the electromagnetic wave demodulation initiation assembly 5 and the two electromagnetic wave acquisition probes 4. The insulators 3 are made of organic insulating materials such as rubber and resin. The insulators 3 are provided with a number of through holes along the direction parallel to the axis of the horizontal part of the tubing 2. The wires of the electromagnetic wave acquisition probes 4 pass through the through holes to connect to the electromagnetic wave demodulation initiation assembly 5. By setting the insulators 3, it can be avoided that the two electromagnetic wave acquisition probes 4 directly form an electrical connection through the metal shell of the device, reducing the voltage signal collected by the electromagnetic wave acquisition probes 4. One end of the electromagnetic wave acquisition probe 4 close to the end of the tubing 2 is also provided with a perforating gun 6 electrically connected to the electromagnetic wave demodulation initiation assembly 5. If the perforating guns 6 of different downhole perforating units 7 are to be detonated simultaneously, then different downhole perforating units 7 are excited by the same electromagnetic wave frequency. If the perforating guns 6 of different downhole perforating units 7 are to be detonated at different times, then different downhole perforating units 7 are excited by different electromagnetic wave frequencies at different times. The electromagnetic wave frequency is the detonation frequency. In this embodiment, the detonation frequency of the downhole perforating unit 7 closest to the end of the tubing 2 is 100 Hz, and the detonation frequency of the other downhole perforating unit 7 is 200 Hz. Preferably, the programming host 9 can be programmed to send a 200 Hz electromagnetic wave detonation signal 5 minutes after sending a 100 Hz electromagnetic wave detonation signal. That is to say, the perforating gun 6 of the downhole perforating unit 7 closest to the end of the tubing 2 will detonate first, and 5 minutes later, the perforating gun 6 of the other downhole perforating unit 7 will detonate.

[0024] More specifically, the electromagnetic wave demodulation initiation assembly 5 includes a single-chip microcomputer, an analog-to-digital acquisition module, and a band-pass filter. The single-chip microcomputer presets a detonation threshold. The single-chip microcomputer acquires the voltage signals on the electromagnetic wave acquisition probes 4 located at both ends of the electromagnetic wave demodulation initiation assembly 5 through the analog-to-digital acquisition module, and demodulates and analyzes the amplitude of the voltage signal corresponding to the detonation frequency after filtering by the band-pass filter. If the amplitude of the voltage signal is greater than the preset detonation threshold, then the corresponding perforating gun 6 is detonated.

[0025] The above are only some embodiments listed in this application and are not used to limit this application.

Claims

1. A programmable multi-point wireless perforating device driven by multi-frequency electromagnetic waves, characterized in that: include: A ground excitation unit is arranged on the ground and comprises a programming host (9) which is connected to two electromagnetic wave excitation antennas (10) whose bottom ends are inserted into the bottom layer, and the frequency of the detonation electromagnetic waves emitted by the electromagnetic wave excitation antennas (10) is lower than 1000 Hz; Two downhole perforating units (7) are sequentially arrayed and sleeved on the end of the oil pipe (2) along the horizontal axis direction of the oil pipe (2). The downhole perforating units (7) include an electromagnetic wave demodulation and detonation assembly (5). Electromagnetic wave collection probes (4) are respectively provided at both ends of the electromagnetic wave demodulation and detonation assembly (5). One end of the electromagnetic wave collection probe (4) close to the end of the oil pipe (2) is also provided with a perforating gun (6) electrically connected to the electromagnetic wave demodulation and detonation assembly (5). Insulators (3) are respectively provided between the two ends of the electromagnetic wave demodulation and detonation assembly (5) and the two electromagnetic wave collection probes (4). The insulators (3) are provided with a plurality of through holes along a direction parallel to the horizontal axis of the oil pipe (2). The wires of the electromagnetic wave collection probes (4) pass through the through holes and are connected to the electromagnetic wave demodulation and detonation assembly (5). If the perforating guns (6) of different downhole perforating units (7) are to be detonated simultaneously, the different downhole perforating units (7) are connected to the same electromagnetic wave demodulation and detonation assembly. The electromagnetic wave demodulation and detonation component (5) is configured to be excited by electromagnetic wave frequency. If the perforating guns (6) of different downhole perforating units (7) are to be detonated in different time periods, the different downhole perforating units (7) are excited by different electromagnetic wave frequencies at different times. The electromagnetic wave frequency that excites the downhole perforating unit (7) is the detonation frequency. The detonation frequency of the downhole perforating unit (7) closest to the end of the oil pipe (2) is 100 Hz, and the detonation frequency of another downhole perforating unit (7) is 200 Hz. The electromagnetic wave demodulation and detonation component (5) comprises a single-chip microcomputer, an analog-to-digital acquisition module, and a bandpass filter. The single-chip microcomputer is preset with a detonation threshold. The single-chip microcomputer collects voltage signals on the electromagnetic wave acquisition probes (4) located at both ends of the electromagnetic wave demodulation and detonation component (5) through the analog-to-digital acquisition module. After filtering through the bandpass filter, the single-chip microcomputer demodulates and analyzes the voltage signal amplitude corresponding to the detonation frequency. If the voltage signal amplitude is greater than the preset detonation threshold, the corresponding perforating gun (6) is detonated.

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