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Foam grouting method for improving marine muddy silt type natural gas hydrate reservoir

A technology for natural gas and hydrate, which is applied in drilling compositions, chemical instruments and methods, and earth-moving drilling, etc., can solve problems such as the level of commercial exploitation, reduce the possibility of geological disasters, increase the The effect of stability and improving efficiency

Active Publication Date: 2020-06-30
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the exploitation of marine gas hydrates is far from the level of commercial exploitation.

Method used

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  • Foam grouting method for improving marine muddy silt type natural gas hydrate reservoir
  • Foam grouting method for improving marine muddy silt type natural gas hydrate reservoir
  • Foam grouting method for improving marine muddy silt type natural gas hydrate reservoir

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Such as figure 1 As shown, there must be a natural gas hydrate layer 2 below the sea level 22, the natural gas hydrate layer 2 is located between the overlying stratum 1 and the underlying stratum 5, and a partition is installed between the offshore drilling platform 16 and the overlying stratum 1 on the seabed. Water pipe 13 and wellhead 23. Using the method of mechanical crushing or hydraulic crushing, the drilling device 21 is used to drill to 5 meters to 20 meters below the bottom of the natural gas hydrate layer 2. During this process, the running conduit 6, surface casing 7, technical casing 8 and Natural gas hydrate layer casing 9, and pump cement slurry from each layer of casing into the annular space between the casing and the well wall to form a cement sheath 12 to prevent the well wall from collapsing.

[0034] The perforating gun is lowered to a predetermined depth, and the gas hydrate layer casing 9 and the cement sheath 12 located in the gas hydrate layer...

Embodiment 2

[0039] The main technical solution of this embodiment is the same as that of Embodiment 1, and the features not explained in this embodiment shall be explained in Embodiment 1. No further details will be given here. Such as figure 2 As shown, the difference between this embodiment and Embodiment 1 is that, when drilling from the surface of the seabed to the gas hydrate layer 2, a horizontal directional well is used in the second section of the gas hydrate layer, and the horizontal well is located at the bottom of the gas hydrate layer 2. centre position. During grouting, the natural gas hydrate layer 2 is grouted in sections, and the length of each section is 3 meters to 8 meters.

Embodiment 3

[0041] The main technical solution of this embodiment is the same as that of Embodiment 1, and the features not explained in this embodiment shall be explained in Embodiment 1. No further details will be given here. The difference between this embodiment and Embodiment 1 is that the foam liquid in the foam cement mortar can be physically foamed. On the offshore drilling platform 16, the foam liquid and cement mortar are fully mixed and foamed by a stirring system or compressed air to obtain foam cement mortar, and the foam cement mortar is injected into the natural gas hydrate layer 2 through the flower pipe section 3 of the grouting pipe 10 .

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Abstract

The invention discloses a method of remolding of an ocean muddy powder sand type natural gas hydrate reservoir adopting a foam slip casting method, and belongs to the field of natural gas hydrate extraction. The method includes the steps that foamed cement mortar is filled into a natural gas hydrate reservoir, and a net-shaped skeleton structure with higher strength and higher permeability compared with an original natural gas hydrate reservoir is formed in the natural gas hydrate reservoir. Compared with the prior art, the stability of the natural gas hydrate reservoir is improved through thenet-shaped skeleton structure on the one hand, and the permeability of the natural gas hydrate reservoir is improved through pores of the net-shaped skeleton structure on the other hand; and the effects that the extraction efficiency of a single well is improved, the extraction period is prolonged, and the happening of geological disasters in the process of hydrate extraction is reduced can be achieved.

Description

technical field [0001] The invention belongs to the field of natural gas hydrate exploitation, and relates to a reservoir reforming method, in particular to a reservoir reforming method of marine argillaceous silt type natural gas hydrate. Background technique [0002] Gas hydrate is an ice-like crystalline substance formed by natural gas and water under high-pressure and low-temperature conditions. It is widely distributed in deep-sea sediments or permafrost on land. Its organic carbon reserves are equivalent to the world's proven coal, Twice as much as oil and natural gas, it is recognized as an important follow-up energy source in the 21st century. [0003] Since the gas hydrate reserves in the ocean are far greater than those on land, the ocean will become the main area for the development of gas hydrate resources in the future. The two offshore natural gas hydrate exploitations in Japan were seabed sandstone-type natural gas hydrates. This type of natural gas hydrate h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/22E21B43/01E21B43/267C09K8/518
CPCC09K8/518E21B43/01E21B43/16E21B43/267
Inventor 孙友宏马晓龙郭威李冰贾瑞曲莉莉王秋雯
Owner JILIN UNIV