Method for determining the source of produced water in coalbed methane drainage and coalbed methane drainage method

A technology for producing water and coalbed methane, applied in the field of coalbed methane wells, can solve the problem of not having a method for determining the source of water produced by coalbed methane drainage and production, and achieve the effects of reducing pressure and quantity

Active Publication Date: 2018-08-24
贝肯能源(北京)有限责任公司
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Problems solved by technology

[0004] At present, there is no method to determine the source of produced water in coalbed methane drainage

Method used

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  • Method for determining the source of produced water in coalbed methane drainage and coalbed methane drainage method
  • Method for determining the source of produced water in coalbed methane drainage and coalbed methane drainage method
  • Method for determining the source of produced water in coalbed methane drainage and coalbed methane drainage method

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Embodiment Construction

[0060] In order to better explain the present invention and facilitate understanding, the present invention will be described in detail below with reference to the accompanying drawings and through specific embodiments.

[0061] see figure 1 (Analysis diagram of produced water and surface drinking water samples from 67 coalbed methane wells in Shizhuang South Block), the method for determining the source of produced water in coalbed methane drainage according to an embodiment of the present invention includes the following steps:

[0062] Step 1, block selection

[0063] The South Shizhuang block is one of the earliest blocks for CBM exploration and development in China. So far, it has reached the stage of commercial development. As a result of nearly two decades of exploration and development, the block has a variety of different production well types, including cased wells, open-hole wells, short radius horizontal wells (SRHD), and horizontally docked wells (SIS). The main...

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Abstract

The invention relates to a method for determining sources of water produced in coalbed methane discharge and mining and a coalbed methane discharge and mining method. The method mainly comprises the steps that sources of water are judged by detecting or analyzing the content of all or several of ingredients including Na<+>, K<+>, Ca<2+>, magnesium<2+>, SO42-, Cl-, HCO3- and CO32- in water and then formulating corresponding discharge and mining methods and relevant water plugging measures according to different water production sources. Water source judgment can be assisted by conducting water sample acquisition and analysis after a coal bed gas production well reaches a stable discharge and mining stage, and accordingly appropriate discharge and mining methods are formulated. More information about a formation and a well body structure can be also obtained, and a help is provided for exploration and development of the coal bed gas well. For example, a reference can be provided for well spacing, so that faults can be effectively avoided during well spacing, the pressure of discharge and mining work can be reduced, and the number of drilled abandoned wells can be also decreased. In addition, the gas production rate of the coal bed gas well can be also predicted according to the result.

Description

technical field [0001] The invention belongs to the technical field of coalbed methane mining, in particular to a method for determining the source of produced water in coalbed methane drainage and production and a coalbed methane drainage and production method, and is especially suitable for coalbed methane wells with high water production. Background technique [0002] In the process of drainage and production of CBM wells, wells with large water production are often encountered. Because these waters will affect CBM wells, they generally need to be treated, and the treatment methods vary depending on the source of the water. Therefore, determining where the produced water comes from and finding out the best treatment plan (such as water plugging plan) has become an important work in the drainage and production of coalbed methane wells. [0003] Usually, these produced water often do not come from the coal seam, and the analysis of the produced water of coalbed methane well...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/10E21B43/00
CPCE21B43/006E21B47/10
Inventor 董文奎杨凡李平刘云聪王子卫魏江卓李艳龙
Owner 贝肯能源(北京)有限责任公司
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