A Discrimination Method for High Pressure Gas-Water Invasion During Cementing in Hydrate Formation

A discrimination method and hydrate technology, applied in earthwork drilling, wellbore/well components, design optimization/simulation, etc., can solve the problems that there is no similar method for simulating hydrate formation cementing process, and achieve good theoretical guidance Effect

Active Publication Date: 2022-03-08
CHENGDU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0005] Due to the limitations of numerical simulation methods, there is no similar method for simulating the cementing process in hydrate formations

Method used

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  • A Discrimination Method for High Pressure Gas-Water Invasion During Cementing in Hydrate Formation
  • A Discrimination Method for High Pressure Gas-Water Invasion During Cementing in Hydrate Formation
  • A Discrimination Method for High Pressure Gas-Water Invasion During Cementing in Hydrate Formation

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Embodiment Construction

[0066] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0067] Such as figure 1 As shown, a numerical simulation method for judging whether high-pressure gas-water intrusion into the cement sheath in hydrate formation cementing includes the following steps:

[0068] Step 1, establishing a numerical model of the hydrate formation, which should include the formation, the casing, the inner space of the casing, and the annular space between the casing and the formation;

[0069] Step 2, divide the numerical model of the hydrate formation into grids, and divide it into several units, and the exchange of matter, or energy, or exchange of matter and energy can be performed between several units;

[0070] Step 3: Design the values ​​of various cementing process parameters (the values ​​are determined according to t...

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Abstract

The invention discloses a method for discriminating high-pressure gas-water reverse intrusion during well cementing in hydrate formations. The value of the well process parameter is used to carry out the simulation test to determine whether the counter-invasion occurs under the value of the cementing process parameter. The invention has the advantages of: being able to highly restore the cementing process of the hydrate formation; and being able to judge whether high-pressure gas and water intrude into the cement sheath in the well cementing of the hydrate formation.

Description

technical field [0001] The invention relates to the technical field of natural gas hydrate development, in particular to a method for judging whether high-pressure gas-water intrusions back into annular space cement slurry during the well cementing process of natural gas hydrate formations. Background technique [0002] Natural gas hydrate is an ice-like non-stoichiometric clathrate compound composed of water molecules and natural gas molecules (mainly CH4, C2H6, CO2, etc.) at low temperature and high pressure. Due to the advantages of large resource reserves, environmental protection and non-polluting main combustion products, and its significance in energy, environment and global climate change, it has become a hot spot in current earth science and energy research. [0003] In the process of deep water oil and gas drilling encountering hydrate formations and hydrate reservoir development, well cementing is an important part of the drilling and completion operation. It incl...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/14E21B49/00G06F30/20
CPCE21B33/14E21B49/00G06F30/20
Inventor 郑明明王晓宇王凯周珂锐吴喆刘天乐郑少军李丽霞
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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