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Coal bed methane drainage and production control method and device

A control method and coalbed methane technology, which is applied in the direction of mining fluid, earthwork drilling, wellbore/well components, etc., can solve problems affecting the service life of drainage equipment, frequent adjustment frequency, and fluctuations in bottomhole flow pressure, so as to avoid well Large fluctuations in bottom flow pressure and the effect of improving mining efficiency

Inactive Publication Date: 2016-07-13
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] By obtaining the bottomhole flow pressure in real time, in the case of frequent changes in the bottomhole flow pressure, the frequency of the acquisition frequency converter will be adjusted too frequently, resulting in large fluctuations in the bottomhole flow pressure, which in turn will lead to frequent failures of the drainage and production equipment. Adjustment affects the service life of drainage equipment and reduces the efficiency of coalbed methane drainage

Method used

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  • Coal bed methane drainage and production control method and device
  • Coal bed methane drainage and production control method and device
  • Coal bed methane drainage and production control method and device

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Embodiment 1

[0059] The embodiment of the present invention provides a control method for coalbed methane extraction, see figure 1 , the method flow includes:

[0060] 101: Obtain the drainage type of the coalbed methane well;

[0061] 102: If the drainage type of the coalbed methane well is a decompression well type, control the frequency of the acquisition frequency converter according to the first time period as a control period;

[0062] Among them, the frequency control methods of the acquisition frequency converter of the pressure-reduction well type include:

[0063] Acquiring the first bottomhole flowing pressure of the current control period detected by the pressure gauge, and comparing the first bottomhole flowing pressure of the current control period with the first ideal bottomhole flowing pressure of the current control period in the preset ideal bottomhole flowing pressure drop curve;

[0064] If the first bottomhole flowing pressure in the current control period is greater...

Embodiment 2

[0073] The embodiment of the present invention provides a control method for coalbed methane extraction, see figure 2 , the method flow includes:

[0074] 201: Obtain the drainage type of the coalbed methane well.

[0075] Among them, the drainage type may include two types, respectively: pressure-reducing well type and pressure-stabilizing well type. In the embodiment of the present invention, the decompression well type is taken as an example for illustration.

[0076] 202: If the drainage type of the coalbed methane well is a decompression well type, control the frequency of the acquisition frequency converter according to the first time period as a control period.

[0077] Wherein, the first time period may be two hours, that is, the frequency of the acquisition frequency converter is controlled at a frequency of once every two hours, and every two hours belongs to a control period, which is controlled 12 times a day.

[0078] Whenever a control cycle is entered, the s...

Embodiment 3

[0100] The embodiment of the present invention provides a control method for coalbed methane extraction, see Figure 4 , the method flow includes:

[0101] 401: Obtain the drainage type of the coalbed methane well.

[0102] Among them, the drainage type may include two types, respectively: pressure-reducing well type and pressure-stabilizing well type. In the embodiment of the present invention, the type of the stabilizing well is taken as an example for illustration.

[0103] 402: If the drainage type of the coalbed methane well is a stabilizing well type, control the frequency of the acquisition frequency converter according to the second time period as a control period; wherein, the first time period is different from the second time period;

[0104] Wherein, the second time period may be half an hour, that is, the frequency of the acquisition frequency converter is controlled according to the frequency of once every half hour, and every half hour belongs to a control per...

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Abstract

The invention discloses a coal bed methane drainage and production control method and device and belongs to the field of coal bed methane drainage and production. The method comprises the following steps: a production type of a coal bed methane well is acquired; if the production type of the coal bed methane well is a water-lowering well type, the frequency of an acquisition frequency converter is controlled according to a first time period as a control period; if the production type of the coal bed methane well is a pressure stabilizing well type, the frequency of the acquisition frequency converter is controlled according to a second time period as the control period. Corresponding time period is selected as the control period according to the production type of the coal bed methane well for control of the frequency of the acquisition frequency converter; the frequency adjustment range of the acquisition frequency converter is determined according to the bottomhole flowing pressure of the current control period and the ideal bottomhole flowing pressure of the current control period. Great fluctuation of the bottomhole flowing pressure due to frequent adjustment of the frequency of the acquisition frequency converter is avoided, and the defect that the service life of drainage and production equipment is affected by frequent adjustment of the drainage and production equipment is overcome; the production efficiency for drainage and production of coal bed methane is increased.

Description

technical field [0001] The invention relates to the field of coal bed gas extraction, in particular to a control method and device for coal bed gas extraction. Background technique [0002] Coalbed methane automation technology is a new technology produced in the process of coalbed methane mining. It consists of a wireless data collector and a production parameter acquisition module. The wireless data collector is the core of the entire control system, and it can directly obtain the bottom hole flow. Production parameters such as pressure, casing pressure, pipe pressure, and frequency of frequency converter are collected. [0003] The core parameter in the entire control system is the bottomhole flow pressure. The intelligent drainage controller obtains the bottomhole flow pressure in real time, and calculates the frequency of the acquisition frequency converter based on the real-time bottomhole flow pressure. When the bottom hole flow pressure does not meet the working sys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/00
Inventor 姚红星杨建雨张建国窦武李洪涛王冀川沈安迪罗天平杨波
Owner PETROCHINA CO LTD
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