Production method of argillaceous silt type natural gas hydrate based on foam injection mortar technology
A mining method and technology of natural gas, applied in the direction of mining fluid, earthwork drilling, wellbore/well components, etc., can solve problems such as sediment instability, improve migration conditions, increase well wall stability, and increase well diameter and the effect of permeability
Active Publication Date: 2020-01-31
JILIN UNIV
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In addition, due to the stability of the sediment at the position where the hydrate particles interact with the sediment particles, the decomposition of the hydrate may cause sediment instability
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[0027] In order to show the present invention more clearly, below in conjunction with preferred embodiment and appended figure 1 The present invention is further described. Those skilled in the art should understand that the content specifically described below is illustrative rather than restrictive, and should not limit the protection scope of the present invention. In order to avoid obscuring the essence of the present invention, known methods and processes are not described in detail.
[0028] A kind of argillaceous silt type natural gas hydrate exploitation method based on foam injection mortar technique proposed by the present invention comprises the following steps:
[0029] Step 1. Obtain the corresponding geological condition data of the argillaceous silt type natural gas hydrate storage area, establish a production well for mining argillaceous silt type natural gas hydrate, and install monitoring instruments at the wellhead. The argillaceous silt type natural gas hy...
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The invention discloses a muddy-silt-type natural gas hydrate exploiting method based on a foam mortar injecting technology and belongs to the technical field of natural gas hydrate exploiting. Foam mortar is injected into a muddy-silt-type natural gas hydrate reservoir through a high-pressure rotary spraying mortar-injection technique to form a foam mortar rotary spraying pile; a production sleeve is sunken into the foam mortar rotary spraying pile through a vibration pipe-sinking mode; a plurality of hydraulic slots are cut on the production sleeve, and cleaving mortar-injection, mortar displacement and hydraulic sand blasting perforation or hydraulic slotting are conducted sequentially, and finally, natural gas hydrate exploiting is conducted through a pressure-reducing method. According to the muddy-silt-type natural gas hydrate exploiting method, through the foam mortar rotary spraying pile, the well diameter and the permeability of a natural gas hydrate production well are improved, the influences of secondary natural gas hydrates formed around the well wall on the exploiting efficiency are reduced, and meanwhile the stability of the well wall can be improved; and through foam mortar layers, the penetrating performance of the muddy-silt-type natural gas hydrate reservoir can be improved, the transport condition of gas and water which are formed by decomposing of the natural gas hydrates is improved, and meanwhile the stability of the muddy-silt-type natural gas hydrate reservoir is improved.
Description
technical field [0001] The invention belongs to the technical field of natural gas hydrate exploitation, and in particular relates to an argillaceous silt type natural gas hydrate exploitation method based on foam injection mortar technology. Background technique [0002] Natural gas hydrate refers to a cage-shaped crystal substance formed by natural gas and water at a specific temperature and pressure. It looks like ice and snow. Because it can be ignited, it is commonly called "combustible ice". Natural gas hydrate has the characteristics of high energy density, wide distribution, large reserves and shallow burial, and is considered to be an ideal alternative energy source in the 21st century. [0003] Natural gas hydrate resources in my country's sea areas are mostly stored in muddy silt reservoirs in the form of thick layers, dispersion, fractures and patches. Because this type of reservoir has low permeability, it is recognized as the most difficult to exploit. Hydrate ...
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IPC IPC(8): E21B43/12E21B43/26
CPCE21B43/121E21B43/26
Inventor 李冰孙友宏马晓龙郭威贾瑞王秋雯曲莉莉
Owner JILIN UNIV