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A Cable Perforator for Preliminary Creation of Fractures in Shale Formation Rocks

A technology for cable perforation and shale formations, which is applied in wellbore/well components, production fluids, earthwork drilling and production, etc. It can solve problems such as low permeability, reduced perforated well differential energy, and poor perforating elastic performance, and achieves Simple operation and the effect of saving chemical raw materials

Active Publication Date: 2017-05-31
CHONGQING UNIV
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  • Claims
  • Application Information

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Problems solved by technology

When this high-speed metal flow encounters an obstacle, it will break through the casing, cement sheath, and oil and gas layer rocks to form a hole, and at the same time form a compaction zone with extremely low permeability around the hole, which will greatly reduce the impact of perforated wells. The difference in energy, conventional perforation technology can not eliminate its influence
In addition, if the performance of the perforating charge is poor, it will also form a pestle blockage.

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  • A Cable Perforator for Preliminary Creation of Fractures in Shale Formation Rocks
  • A Cable Perforator for Preliminary Creation of Fractures in Shale Formation Rocks
  • A Cable Perforator for Preliminary Creation of Fractures in Shale Formation Rocks

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Embodiment Construction

[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0033] In the description of the present invention, it should be understood that the terms "center", "portrait", "horizontal", "top", "bottom", "front", "rear", "left", "right", " The orientation or positional relationship indicated by "top", "bottom", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that The device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0034] see Figure 1-Figure 9 , a cable perforator for preliminarily creating fractures in shale rock, including a casing 20, an energy release device, an inner electrode and an o...

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Abstract

The invention relates to a cable perforation device for preliminary fracture forming of shale bed rock. A sleeve is provided with an independent inner cavity and an independent outer cavity from interior to exterior in the radial direction of the sleeve, wherein the inner cavity and the outer cavity are communicated in the axial direction of the sleeve. A liquid charging and discharging valve comprises a valve body and a chemical thermal reaction device. The valve body is provided with an electrode introducing structure and a liquid charging structure for charging liquid into the inner cavity and the outer cavity. The chemical thermal reaction device is connected with the valve body and located in the outer cavity. An energy releasing device comprises an energy releasing body which is provided with a through hole and an energy releasing hole, the through hole is communicated with the inner cavity, an included angle of 30-120 degrees is formed between the energy releasing hole and the axis of the energy releasing device, and the energy releasing hole is communicated with the through hole. An external electrode is used for connecting electricity to the cable perforation device, and an inner electrode is used for introducing external electricity into the chemical thermal reaction device. The cable perforation device is safe and reliable, industrial waste gas CO2 is used for replacing explosives, chemical materials are saved, and the environmental-friendly value is achieved. Corresponding burst pressure can be correspondingly controlled according to different terrain.

Description

technical field [0001] The invention relates to a preliminary fracture-making device during the exploitation of shale gas layers, in particular to a cable perforator for preliminary fracture-making of shale layer rocks. Background technique [0002] Shale gas refers to unconventional natural gas existing in organic-rich mudstone and its interlayers, mainly in adsorption or free state, and mainly composed of methane. In recent years, technological breakthroughs in the exploration and development of shale gas in the United States have led to a rapid increase in production, realizing its "natural gas revolution", which has had a significant impact on the international natural gas market and the world energy pattern, and has greatly rewritten the world energy pattern. However, shale rock has the characteristics of compact structure, hard structure and ultra-low permeability, so shale gas development is very difficult. [0003] At present, the relatively mature technical solutio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/114
Inventor 赵瑜陈宇超陈海林何力何鹏飞
Owner CHONGQING UNIV
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