阅读说明：本技术 复合射孔利用隔板雷管延时负压装置 (Composite perforating negative pressure device using partition detonator delay ) 是由 禹栽星 王禹天 陈德祥 刘爽 于 2020-12-31 设计创作，主要内容包括：本发明涉及一种复合射孔利用隔板雷管延时负压装置,包括射孔枪、负压装置和负压枪,负压装置内装有负压活塞,负压装置侧壁上开有进液孔,负压活塞和负压装置之间通过销钉连接,负压装置通过螺纹与负压枪连接；所述的射孔枪和负压装置之间还装有隔板雷管延时装置,所述的隔板雷管延时装置包括主体、隔板传爆件、延时雷管、火药室、连接滑套,主体一端通过螺纹连接射孔枪,另一端通过滑套和负压装置连接,主体内设有延时雷管,延时雷管上游连接隔板传爆件,下游通过火药室连接负压活塞。本发明利用延时雷管和火药的能量传递过程控制所需延时时间,整体结构设计紧凑,便于施工现场使用安装,大幅度地降低了作业工人的劳动强度。(The invention relates to a composite perforation utilizes the delayed negative pressure device of baffle detonator, including perforating gun, negative pressure apparatus and negative pressure gun, the negative pressure apparatus installs the negative pressure piston inside, open the liquid inlet hole on the sidewall of the negative pressure apparatus, connect through the pin between negative pressure piston and the negative pressure apparatus, the negative pressure apparatus connects with negative pressure gun through the whorl; the perforating gun and the negative pressure device are also provided with a clapboard detonator delay device, the clapboard detonator delay device comprises a main body, a clapboard detonating piece, a delay detonator, a propellant chamber and a connecting sliding sleeve, one end of the main body is connected with the perforating gun through a thread, the other end of the main body is connected with the negative pressure device through the sliding sleeve, the main body is internally provided with the delay detonator, the upper stream of the delay detonator is connected with the clapboard detonating piece, and the lower stream of the delay detonator is connected with a negative pressure piston through the propellant chamber. The invention utilizes the energy transfer process of the delay detonator and the gunpowder to control the required delay time, has compact integral structure design, is convenient for use and installation on a construction site, and greatly reduces the labor intensity of operating workers.)

1. The utility model provides a compound perforation utilizes baffle detonator time delay negative pressure device, includes perforating gun (1), negative pressure device (2) and negative pressure gun (3), is equipped with negative pressure piston (4) in negative pressure device (2), and it has the feed liquor hole to open on negative pressure device (2) lateral wall, is connected through pin (5) between negative pressure piston (4) and the negative pressure device (2), and negative pressure device (2) are connected its characterized in that through screw and negative pressure gun (3): perforation gun (1) and negative pressure device (2) between still be equipped with baffle detonator delay unit, baffle detonator delay unit include main part (6), baffle booster (7), time delay detonator (8), explosive chamber (9), connect sliding sleeve (10), threaded connection perforation gun (1) is passed through to main part (6) one end, the other end passes through sliding sleeve (10) and is connected with negative pressure device (2), be equipped with time delay detonator (8) in main part (6), baffle booster (7) is connected in time delay detonator (8) upper reaches, negative pressure piston (4) are connected through explosive chamber (9) in low reaches.

2. The partition detonator delay negative pressure device for composite perforation according to claim 1, wherein: the delay detonator (8) is filled with powder with low detonation velocity.

3. The partition detonator delay negative pressure device for composite perforation according to claim 1, wherein: the base of the connecting sliding sleeve (10) is also provided with an anti-back-off retaining ring (11).

Technical Field

The invention belongs to the field of oilfield machinery, and relates to a composite perforating utilization partition plate detonator delayed negative pressure device.

Background

In order to improve the productivity of oil field perforation, composite dynamic negative pressure perforation is widely used nowadays, and high-energy gas fracturing is carried out on a near-well geological rock stratum of a perforation section by utilizing the synergistic effect of high-energy gunpowder, and pollution is removed from a perforation channel and the near-well geological rock stratum after perforation. The well completion effect of the perforation is improved, and the recovery ratio of the oil-gas well is improved. In the composite dynamic negative pressure perforation, the perforation is completed in microsecond level, and the combustion of the composite powder solid propellant is completed in millisecond level. The dynamic negative pressure device constructed along with the belt is characterized in that after a perforating gun finishes perforating and the combustion of a composite gunpowder solid propellant generates a pressure peak value, an opening on the device is opened under the action of mechanical kinetic energy or other kinetic energy of the negative pressure device, well fluid is enabled to quickly rush into the negative pressure gun through the opening by utilizing the space in the gun of the negative pressure gun carried under the perforating gun, the loss of the well fluid in a perforating well section is caused instantly, the pressure of the well fluid in the perforating well section is reduced instantly to generate negative pressure, the generated negative pressure directly acts on a perforating pore passage, and a compaction belt on the pore passage wall caused by jet flow is broken by utilizing the pressure difference between the inside and the outside of. Meanwhile, liquid in the pore canal flows outwards under the action of the pressure difference between the inside and the outside of the pore wall, broken rock fragments are taken out of the pore canal, and the original permeability of the perforation pore canal and the cleanness of the pore canal are recovered.

In the overall technology of the composite dynamic negative pressure perforation, the acting time of the dynamic negative pressure is the key technical point of the process of the composite perforation. When the detonation energy of the perforating charge triggers the solid propellant to burn, the solid propellant needs about 20 milliseconds before a pressure peak can be generated in the perforating well section. If the dynamic negative pressure acts before the pressure peak value, the effect of the pressure of the composite explosive on the well section can be weakened, and the composite perforation is enabled to be invalid. If the dynamic underpressure effect is too late with respect to the pressure peak point in time, the dynamic underpressure effect is reduced again. Therefore, the method is a core technology of composite dynamic negative pressure perforation, and can accurately control the delay time of the negative pressure relative to the pressure peak value after perforation.

The existing delay technology used in the composite dynamic negative pressure perforation adopts the mechanical stroke mode of a negative pressure device component to delay time, and the moving falling stroke of the component is utilized to determine the delay time required by the composite dynamic negative pressure perforation. The time delay technology is limited to the size of the negative pressure gun, and in order to ensure that the whole device can provide enough time delay, the negative pressure gun is designed into two parts, the upper half section of the negative pressure gun is a space for providing the falling stroke of the time delay part, and the hole opening device is designed in the middle section of the whole negative pressure gun. When perforating, the detonation energy of the perforating gun excites the delay component, the delay component falls down with acceleration under the action of kinetic energy, and impacts a piston of the perforating device to open the negative pressure gun. Because the negative pressure devices are structurally designed and dispersed and are assembled on a well site construction site, and the two sections of negative pressure guns are assembled with the negative pressure devices and then are butted, the labor intensity of workers is very high. Therefore, further improvements to the existing negative pressure delay devices are needed.

Disclosure of Invention

The invention aims to provide a partition plate detonator delay negative pressure device for composite perforation, which solves the problems of time delay, dispersed design, overlarge volume and difficult assembly of the existing delay technology used in the composite dynamic negative pressure perforation by adopting a mechanical stroke mode.

The invention is realized by the following technical scheme: a composite perforation utilizes the delayed negative pressure device of the baffle detonator, including perforating gun, negative pressure device and negative pressure gun, the negative pressure device is equipped with the negative pressure piston inside, open the liquid inlet hole on the sidewall of the negative pressure device, connect through the pin between negative pressure piston and the negative pressure device, the negative pressure device connects with negative pressure gun through the whorl; the perforating gun and the negative pressure device are also provided with a clapboard detonator delay device, the clapboard detonator delay device comprises a main body, a clapboard detonating piece, a delay detonator, a propellant chamber and a connecting sliding sleeve, one end of the main body is connected with the perforating gun through a thread, the other end of the main body is connected with the negative pressure device through the sliding sleeve, the main body is internally provided with the delay detonator, the upper stream of the delay detonator is connected with the clapboard detonating piece, and the lower stream of the delay detonator is connected with a negative pressure piston through the propellant chamber.

Furthermore, the delay detonator is filled with gunpowder with low detonation velocity.

Furthermore, the base of the connecting sliding sleeve is also provided with an anti-back-off retaining ring.

Adopt above-mentioned technical scheme's positive effect: the delay time required by the energy transfer process control of the delay detonator and the gunpowder is utilized, the delay detonator and the gunpowder chamber are designed on the inner cavity of the middle joint of the negative pressure gun of the perforating gun, the negative pressure device is also designed at the middle connection part of the perforating gun and the negative pressure gun, the delay device and the negative pressure device can be assembled together through threads, the volume of the whole device is slightly larger than the middle joint of the perforating gun, and the delay device and the negative pressure device are mutually connected by adopting a sliding sleeve mode which is convenient to operate, so that the delay dynamic negative pressure device is compact in integral structure design from the delay mechanism to the negative pressure tapping device, convenient to use and install in a construction site, and greatly reduces the labor intensity of operating workers.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Fig. 2 is an enlarged view of the bulkhead detonator delay device of fig. 1.

Fig. 3 is an enlarged view of the negative pressure device of fig. 1.

In the figure, a perforating gun 1, a negative pressure device 2, a negative pressure gun 3, a negative pressure piston 4, a pin 5, a main body 6, a clapboard booster 7, a delay detonator 8, a propellant chamber 9, a connecting sliding sleeve 10 and an anti-back-off retaining ring 11.

Detailed Description

The technical solution of the present invention is further described below with reference to the accompanying drawings, but the present invention should not be construed as being limited thereto:

fig. 1 is a schematic structural diagram of the invention, fig. 2 is a schematic structural diagram of a partition detonator delay device in fig. 1, fig. 3 is a schematic structural diagram of a negative pressure device in fig. 1, and as shown in the drawing, the partition detonator delay negative pressure device for composite perforation comprises a perforating gun 1, a negative pressure device 2 and a negative pressure gun 3, wherein a negative pressure piston 4 is arranged in the negative pressure device 2, a liquid inlet hole is formed in the side wall of the negative pressure device 2, the negative pressure piston 4 is connected with the negative pressure device 2 through a pin 5, and the negative pressure device 2 is connected with the negative pressure gun 3 through a thread. The perforating gun is characterized in that a partition detonator delay device is further arranged between the perforating gun 1 and the negative pressure device 2, the partition detonator delay device comprises a main body 6, a partition booster 7, a delay detonator 8, a propellant chamber 9 and a connecting sliding sleeve 10, one end of the main body 6 is connected with the perforating gun 1 through threads, the other end of the main body is connected with the negative pressure device 2 through the sliding sleeve 10, the delay detonator 8 is arranged in the main body 6, the upper stream of the delay detonator 8 is connected with the partition booster 7, and the lower stream of the delay detonator 8 is connected with the negative pressure piston 4 through the propellant chamber 9. The delay detonator 8 is filled with powder with low detonation velocity, and can be a delay detonator with 50ms delay level.

In order to prevent the back-off, the base of the connecting sliding sleeve 10 is also provided with a back-off prevention retaining ring 11.

In the device, the clapboard explosion transfer piece can transfer detonation energy and prevent the pressure generated by the perforating gun from being transferred into the negative pressure gun, thereby eliminating the occupation of the pressure energy generated by perforating on the negative pressure gun space and ensuring the manufacturing effect of dynamic negative pressure. Meanwhile, the clapboard explosion transfer piece is sealed by the sealing rubber ring, so that the gun explosion accident caused by the fact that well fluid is mixed into the perforating gun can be prevented in case of untight sealing of the negative pressure gun. The lower end of the delay detonator is provided with a gunpowder chamber for filling gunpowder. Gunpowder is a power source for opening the negative pressure device. The powder is excited to burn to generate gas pressure, the negative pressure piston is pushed downwards to cut off a pin of the negative pressure device, the negative pressure piston is pushed by the acting force of the powder to be separated from a main body of the negative pressure device, a liquid inlet hole of the negative pressure device is opened, well liquid flows into the negative pressure gun from the liquid inlet hole to instantly cause the loss of the well liquid at a perforation well section, the pressure of the well liquid at the perforation well section is instantly reduced to generate negative pressure, the generated negative pressure directly acts on a perforation pore channel, and a compaction zone on the pore channel wall caused by jet flow is crushed by utilizing the pressure difference between the inside and the. Meanwhile, liquid in the pore canal flows outwards under the action of the pressure difference between the inside and the outside of the pore wall, broken rock fragments are taken out of the pore canal, and the original permeability of the perforation pore canal and the cleanness of the pore canal are recovered.

The negative pressure device is internally provided with a negative pressure piston, the side wall of the negative pressure device is provided with a liquid inlet hole, and the negative pressure piston is connected with the negative pressure device through a pin. The liquid inlet hole is used for providing a channel for the well liquid to enter the negative pressure gun after the negative pressure device piston falls off from the negative pressure device main body. The negative pressure piston can cut off the pin and then slide into the negative pressure gun under the pressure effect generated by gunpowder, a liquid inlet hole of the negative pressure device is opened, well liquid quickly flows into the negative pressure gun, and the negative pressure of a perforation well section of the oil-gas well is generated.

During composite perforation construction, the components are assembled according to the sequence shown in figure 1, and the Tr90 multiplied by 4 threaded end of the partition detonator delay device is connected to the lower end of a perforating gun; the Tr 90X 4 threaded end of the negative pressure device is connected to the upper end of the negative pressure gun. Then, the assembled partition detonator delay device and the negative pressure device are connected in a butt joint mode, and the composite dynamic negative pressure perforating equipment tubular column is conveyed to a perforating layer section of the perforating well through a cable to be perforated. When perforating, detonation energy of a perforating gun is used for detonating a delay detonator through a partition plate explosion transfer piece, the delay detonator slowly transfers the detonation energy, the delay detonator excites gunpowder in a gunpowder chamber, the gunpowder is detonated to generate high-pressure gas, the high-pressure gas pushes a negative pressure piston downwards to cut a pin, then the piston of a negative pressure device slides into the negative pressure gun, a liquid inlet hole of the negative pressure device is opened, well liquid quickly flows into the negative pressure gun to cause loss of the well liquid at a perforating well section instantly, the pressure of the well liquid at the perforating well section is reduced instantly to generate negative pressure, the generated negative pressure directly acts on a perforating pore channel, and a compaction zone on the pore channel wall caused by jet flow is broken by utilizing the pressure difference between the inside and the outside of the pore channel wall. Meanwhile, liquid in the pore canal flows outwards under the action of the pressure difference between the inside and the outside of the pore wall, broken rock fragments are taken out of the pore canal, and the original permeability of the perforation pore canal and the cleanness of the pore canal are recovered.

The composite perforation dynamic negative pressure delay technology requires that the delay time is mostly about 20ms, the required delay time is short and difficult to control, and a delay device of a mechanical structure or the volume of the device is too large, or the delay mechanism is complex and the delay time is inaccurate. In order to solve the technical problem, the delay detonator can be easily used by selecting proper gunpowder with low detonation speed and controlling the explosive quantity. The charging of the delay detonator uses the powder with low deflagration speed, and the powder with proper deflagration speed and proper charging amount are selected to control and reach the delay time required by the delay device according to the required delay time. The delay detonator is excited by the detonation energy of the perforating bullet during perforating, the gunpowder for pushing the piston of the negative pressure device is triggered by the delay detonator after the preset time, the piston of the negative pressure device is pushed by the combustion energy of the gunpowder, and the liquid inlet hole of the negative pressure device is opened to produce negative pressure.

The invention and innovation point of the invention are that the time delay characteristic of a special detonator is effectively utilized, and the time delay time required by the dynamic negative pressure of the composite perforation is accurately controlled by adopting the time delay detonator. The delay detonator can control the transfer speed of detonation energy by selecting gunpowder with low burning and explosion speed and controlling the dosage of the gunpowder, and the dynamic negative pressure device is opened in a delayed manner after the composite perforation. The delay detonator is a low detonation velocity explosive because of the explosive loading, and the control range of the required delay time can reach the second level from the millisecond level through the optimized combination of the detonation velocity and the explosive loading. Therefore, the time controllable range of the delay detonator is wide, and the application range is wide.

The delay time required by the energy transfer process control of the delay detonator and the gunpowder is utilized, the delay detonator and the gunpowder chamber are designed on the inner cavity of the middle joint of the negative pressure gun of the perforating gun, the negative pressure device is also designed at the middle connection part of the perforating gun and the negative pressure gun, the delay device and the negative pressure device can be assembled together through threads, the volume of the whole device is slightly larger than the middle joint of the perforating gun, and the delay device and the negative pressure device are mutually connected by adopting a sliding sleeve mode which is convenient to operate, so that the delay dynamic negative pressure device is compact in integral structure design from the delay mechanism to the negative pressure tapping device, convenient to use and install in a construction site, and greatly reduces the labor intensity of operating workers.