Qingdao Institute of Marine Geology

China University of Petroleum

Changling Liu

Nengyou Wu

Qiang Chen

Gaowei Hu

Yanfeng Geng

Yanlong Li

Lanchang Xing

Chenquan Hua

Jianye Sun

Yu Qi

Chengfeng Li

The present invention discloses a silty marine natural gas hydrate gravel stimulation mining method and a mining device. The mining method appropriately relaxes the sand retention accuracy of a wellbore, so that the fine sand and muddy components of the stratum can flow into the wellbore, and after a certain period of production, the coarse gravels are injected into the extra-pipe stratum of the production well to fill the deficit caused by the production of the fine components of the stratum and the hydrates, and then the well is opened for production. The method achieves the triple objectives of improving the productivity of the silty reservoir, preventing the large-area deficit in the stratum and extending the effective period of the sand retention of the wellbore, by way of the alternation of the rounds of the gravel injection and the hydrate reservoir fluid extraction.

Silty marine natural gas hydrate gravel stimulation mining method and mining device

A submarine shallow hydrate exploitation device, including an exploitation unit and a collection unit. The exploitation unit includes: a submarine ship working on a seabed; a drain chamber arranged on the submarine ship, wherein a pressure valve is arranged at a top of the drain chamber, one-way drain holes are formed in a bottom of the drain chamber, and water from massive hydrates is controlled to be discharged out of the drain chamber; a high-speed spiral bit configured to mine and convey sediments; a rotary ring arranged at an inlet end of the drain chamber and configured to connect the drain chamber with the high-speed spiral bit to provide rotation power for the high-speed spiral bit; a steering arm arranged on the submarine ship and configured to realize a rotation of the high-speed spiral bit; a crusher arranged on the submarine ship and configured to crush dried massive hydrates.

Submarine shallow hydrate exploitation device and exploitation method thereof

The present invention disclosures a test system and test method for a simulation experiment of gas hydrate in a porous medium. The test system comprises a reactor, a sensor system, a hardware interface apparatus and a data processing system; the reactor is used for containing tested medium, the sensor system is mounted inside the reactor, and the sensor system is connected to the data processing system through the hardware interface apparatus; the test method comprises a procedure of experiment and measurement data acquisition, and a procedure of analyzing and processing measurement signals; by establishing of electrical model I, acoustic model II and the fused model III, realizing the simulation of the synthesis/decomposition processes of gas hydrate in the deposits in laboratory environment and implementation of the acoustic and electrical parameters combined test, an accurate gas hydrate saturation calculation model can be established at last.

Test system and test method for a simulation experiment of gas hydrate in a porous medium

Growing community of inventors

Qingdao, China

Changling Liu