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A partial pressure combined production device and method for deep coalbed methane and shallow low-pressure tight gas

A technology for coalbed methane and tight gas, which is applied in the development of fluids, earthwork drilling, wellbore/well components, etc. It can solve the problems of small quantity, inability to fracturing different rock layers, and inability to discharge coalbed methane, and achieves an increase in quantity and increase in quantity. The effect of large crack width and number

Active Publication Date: 2022-04-26
CHINA UNIV OF GEOSCIENCES (BEIJING)
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Problems solved by technology

At present, in the existing devices for coalbed methane partial pressure and co-production, it is not possible to fully fracture different rock formations, and after fracturing the rock formations, the cracks produced are narrow in width and small in number, and cannot fully fracture the coal seam. Exhaust gas, low collection efficiency, waste of resources

Method used

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  • A partial pressure combined production device and method for deep coalbed methane and shallow low-pressure tight gas
  • A partial pressure combined production device and method for deep coalbed methane and shallow low-pressure tight gas
  • A partial pressure combined production device and method for deep coalbed methane and shallow low-pressure tight gas

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Embodiment Construction

[0034] refer to figure 1 , the present invention provides a technical solution: a deep coalbed gas and shallow low-pressure tight gas partial pressure combined production device, which includes a fracturing pipe 1, a connecting shaft shell 2, a sealing expansion element 3, a pressure monitor 4 and a combined production Device 5, the fracturing tube 1 is a multi-segment spliced ​​structure, the adjacent end of the fracturing tube 1 is installed with a sealing expansion element 3, and the outer circular surface of the sealing expansion element 3 is equipped with a connecting shaft shell 2. A pressure monitor 4 is installed on the side ring surface of the connecting shaft shell 2, and a joint mining device 5 is installed between the adjacent connecting shaft shells 2, and the combined mining device 5 performs fracturing on the rock formation where it is located, and The sealing expansion element 3 and the pressure monitor 4 respectively seal and pressure detect the space layer ca...

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Abstract

The invention discloses a device and method for partial pressure combined production of deep coalbed gas and shallow low-pressure tight gas, which includes a fracturing pipe, a connecting shaft shell, a sealing expansion element, a pressure monitor, and a combined production device. The fracturing pipe It is a multi-stage splicing structure, and the adjacent ends of the fracturing pipes are all equipped with sealing expansion elements, and the outer circular surface of the sealing expansion elements is equipped with a connecting shaft shell, and the ring surface on the side of the connecting shaft shell is installed with pressure A monitoring instrument, a joint production device is installed between the adjacent connecting shaft shells, and the joint production device performs fracturing on the rock formation where the joint production device is located, and the sealing expansion element and the pressure monitor respectively monitor the space layer cavity where the joint production device is located. Carry out sealing and pressure testing.

Description

technical field [0001] The invention relates to the technical field of coalbed methane mining, in particular to a device and method for partial pressure combined production of deep coalbed methane and shallow low-pressure tight gas. Background technique [0002] Tight sandstone gas is referred to as tight gas for short. The natural gas distributed in tight sandstone refers to the reservoir rock where the tight gas is located with low porosity (<10%), low permeability, low gas saturation (<60%), and low water saturation. High (>40%), natural gas in sandstone formations where gas flows more slowly in sandstone formations. The exploitation of tight gas requires the use of fracturing technology, which is expensive to exploit and is sometimes classified as unconventional natural gas. The development and utilization of unconventional natural gas resources is not only a powerful supplement to the shortage of conventional natural gas resources, but also an economic replace...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/00E21B43/26E21B47/06E21B43/116E21B43/119F16F15/067
CPCE21B43/006E21B43/26E21B47/06E21B43/116E21B43/119F16F15/06
Inventor 钟广浩李松吴世清杨仕状
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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