公开(公告)号：US11988074B2

公开(公告)日：2024-05-21

申请号：US17272929

申请日：2021-01-04

申请人： FU ZHOU UNIVERSITY

发明人： Xuezhen Wu ,  Dayong Li ,  Yujing Jiang

IPC分类号： E21B41/00 ,  E21B7/18 ,  E21B21/00 ,  E21B33/127 ,  E21B43/08 ,  E21B43/12 ,  E21B43/24

CPC分类号： E21B41/0099 ,  E21B7/185 ,  E21B21/001 ,  E21B33/127 ,  E21B43/08 ,  E21B43/128 ,  E21B43/2401

摘要： The invention discloses a suction cylinder exploitation device and method for marine natural gas hydrates. The exploitation device comprises an exploitation cylinder, a water pump, a sand control device, a liquid-gas filling system and the like. Through the specially-designed exploitation cylinder and mating devices thereof, the exploitation cylinder can sink below a seabed surface to exploit natural gas hydrates deep below the seabed surface and can be withdrawn. A series of problems such as high well drilling and completion cost of traditional deep-sea drilling exploitation methods, and damage, collapses and sand generation of plain concrete wellbores under the effect of formation pressure are solved, and the limitations that traditional capping depressurization methods can only exploit submarine superficial hydrates and are low in exploitation efficiency are overcome. The invention can greatly reduce the exploitation cost of natural gas hydrates deep below the seabed surface and is of great significance for commercial exploitation of marine natural gas hydrates.

公开(公告)号：US12098622B2

公开(公告)日：2024-09-24

申请号：US17272934

申请日：2021-01-04

申请人： FU ZHOU UNIVERSITY

发明人： Xuezhen Wu ,  Yujing Jiang ,  Dayong Li

IPC分类号： E21B7/26 ,  E21B33/127 ,  E21B41/00 ,  E21B43/08 ,  E21B43/12 ,  E21B43/267

CPC分类号： E21B41/0099 ,  E21B7/26 ,  E21B33/127 ,  E21B43/08 ,  E21B43/128 ,  E21B43/267

摘要： A self-entry exploitation device and method for marine natural gas hydrates is provided. The exploitation device includes a self-entry structural body (1), a sand control device (2) and a gas-liquid lifting system. The self-entry structural body (1) is a gravity anchor. The sand control device (2) and the gas-liquid lifting system are mounted on the self-entry structural body (1). At least one cavity (21) is formed between the self-entry structural body (1) and the sand control device (2), and the cavity (21) is communicated with at least one channel. The sand control device (2) allows liquid and gas to pass through to enter the cavity (21) and is able to filter out silt. The gas-liquid lifting system includes at least one lifting power device (31) and has an end connected to the cavity (21) and an end extending out through a pipeline. By adoption of the exploitation device, drilling is not needed, the self-entry structural body (1) can enter a natural gas hydrate reservoir or a free gas layer below the natural gas hydrate reservoir, so that depressurizing exploitation can be realized, an exploitation system can be withdrawn, and the exploitation cost of natural gas hydrates can be greatly reduced.