Natural gas hydrate horizontal multilateral well exploitation method based on deepwater suction anchor

A technology of horizontal lateral wells and production methods, which is applied in the fields of production fluids, earthwork drilling, wellbore/well components, etc., can solve the problems of limited improvement of natural gas hydrate production, small control area of ​​a single well, and high cost of test production , to achieve the effect of promoting the commercial development process, improving the stability of the wellhead, and increasing the productivity of a single well

Pending Publication Date: 2020-10-02
GUANGZHOU MARINE GEOLOGICAL SURVEY
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Problems solved by technology

[0003] At present, there is still a certain gap between the horizontal well depressurization production method and the production required for commercial production, and it needs to be combined with other scientific and effective production stimulation technologies
In addition, regardless of the w

Method used

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  • Natural gas hydrate horizontal multilateral well exploitation method based on deepwater suction anchor
  • Natural gas hydrate horizontal multilateral well exploitation method based on deepwater suction anchor
  • Natural gas hydrate horizontal multilateral well exploitation method based on deepwater suction anchor

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Effect test

Embodiment 1

[0024] For the horizontal branch well method of natural gas hydrate based on the single wellhead deepwater suction anchor, taking the single wellhead deepwater suction anchor to establish a single wellbore and complete the drilling of two horizontal branch wells as an example, the implementation steps of this production method are as follows:

[0025] 1) The first part, establishing a single wellbore:

[0026] 1. First run the suction anchor, establish the wellhead foundation, and ensure the stability of the wellhead;

[0027] 2. Secondly, inject the catheter through the inner cylinder of the suction anchor structure and run it into the surface casing, or use the drill bit to drill down through the inner cylinder of the suction anchor structure, and then cement the well after running into the surface casing;

[0028] 3. Finally, continue drilling through the surface casing, drill the second wellbore, and run the casing string with the casing bifurcation nipple and cement the w...

Embodiment 2

[0040] Aiming at the gas hydrate horizontal branch well method based on multi-wellhead deepwater suction anchors, taking double wellhead deepwater suction anchors as an example to establish two wellbores to complete the drilling of four horizontal branch wells, and the above-mentioned single wellhead deepwater suction anchors to establish a single wellbore to complete drilling two branches The well implementation steps are similar. After the drilling and completion operation in the first wellbore is completed, the same steps are carried out in the second wellbore to realize multi-wellhead (double wellhead) deepwater suction anchors and establish dual wellbore completion drilling with four horizontal branches. Implementation of wellbore trajectory.

[0041] In the actual production and application of a natural gas hydrate horizontal branch well mining method based on deep water suction anchors of the present invention, after the well body structure of the horizontal branch well ...

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Abstract

The invention relates to the technical field of natural gas hydrate exploitation accessory devices, in particular to a natural gas hydrate horizontal multilateral well exploitation method based on a deepwater suction anchor. The natural gas hydrate horizontal multilateral well exploitation method can improve the single-well productivity of hydrates, reduce the single-well construction cost and improve the economic and technical indexes of hydrate exploitation. The method comprises the following steps that (1) a deepwater suction anchor wellhead is lowered into a well position, and drilling operation is carried out through a suction anchor inner barrel; (2) a casing string with a casing bifurcation system tool is tripped in, a casing bifurcation short section in a casing bifurcation systemserves as a guide, and drilling of multiple horizontal branch wells is completed; (3) a fishbone tool is used in each open hole horizontal well for performing yield-increasing transformation operationon a hydrate reservoir; (4) a sand control screen pipe is hung in a fishbone pipe column; and (5) a complete natural gas hydrate horizontal multilateral well body structure based on the deepwater suction anchor is established.

Description

technical field [0001] The invention relates to the technical field of auxiliary devices for natural gas hydrate exploitation, in particular to a method for exploiting natural gas hydrate horizontal branch wells based on deepwater suction anchors. Background technique [0002] At present, natural gas hydrate reservoirs in sea areas around the world are all in the trial production stage, and the theoretical production techniques mainly include thermal stimulation method, depressurization method, chemical reagent method, CO2 replacement method, fracturing mining method, solid mining method, etc., while the actual trial production process The most common ones are the thermal stimulation method and the depressurization method. At the same time, vertical wells are mostly used in the design of the wellbore structure. On the basis of the test production of the wellbore structure, the production and stable production period of the natural gas hydrate test production have been greatl...

Claims

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Application Information

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IPC IPC(8): E21B43/01E21B43/30
CPCE21B43/01E21B43/305
Inventor 秦绪文寇贝贝李博谢文卫钟奕昕于彦江卢秋平李晶
Owner GUANGZHOU MARINE GEOLOGICAL SURVEY
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