40 results about "Hydrate dissociation" patented technology

It is an object of the present invention to provide a deriving technique with economy and technical difficulty improved without depending on fuel consumption for a heat source when methane gas is derived from a methane hydrate layer. Warm water is pumped up by a pump from an underground aquifer present 1000 to 1500 m below the seabed, geothermal energy is caused to flow through a permeable layer below a methane hydrate layer, a dissociation boundary surface of an un-dissociated area of the methane hydrate layer is dissociated to generate methane gas, the methane gas is led into a production well from peripheral areas and through a gas inlet screen and caused to rise so that the methane gas is collected on the sea.

Disclosed herein is an apparatus and method for simulating a submarine landslide. The apparatus includes an inclined flume; a plurality of sedimentary layers which are stacked on top of one another in the flume and tapped; water which is charged into the flume on the sedimentary layers in such a way that the surface of the water is formed in the flume; and a plurality of injectors which are provided in a bottom of the flume so as to be movable upwards or downwards with respect to the flume and inject gas or water into the sedimentary layer. The sedimentary layers are changed in pressure and temperature by the gas or water injected from the injectors into the sedimentary layers so that an artificial slope collapse is caused, whereby a water wave is generated in the flume.

The present invention provides a method for continuous separation of methane, carbon dioxide and hydrogen sulfide from biogas by hydrate method, and a three-stage gas separation device for implementing the method. High purity methane is separated by a first stage hydrate dissociation tower working at the temperature of 273.7K-283.1K and under the pressure of 1.324MPa-4.502MPa, high-purity carbon dioxide is separated by a second stage hydrate dissociation tower working at the temperature above 272.8K-288.7K and under the pressure of 0.093MPa-0.499MPa; high-purity hydrogen sulfide is separated by a third stage hydrate dissociation tower working at the temperature above room temperature and under the pressure above atmospheric pressure, and the three-stage gas separation device can be controlled by a written program by a computer to run automatically and select the proper working condition. The gas-liquid contact efficiency, hydrate formation rate, separation process target gas recovery rate and gaseous product purity are improved, hydrate formation heat removal is enhanced, high pressure hydrate system gas, liquid and solid three-phase automatic separation can be achieved, and the method can replace the existing technology, and can be used in production of continuous separation of methane, carbon dioxide and hydrogen sulfide from biogas by industrialized hydrate method.

The disclosure discloses a method for obtaining formation parameters of a gas hydrate reservoir through well testing interpretation, which comprises: (1) establishing a physical model for well testing interpretation of the gas hydrate reservoir according to multiphase flow, hydrate dissociation, secondary hydrate formation and heat transfer exhibited in the well testing process of the gas hydrate reservoir; (2) establishing a mathematical model for well testing interpretation of the gas hydrate reservoir; (3) conducting spatial discretization and temporal discretization on the mathematical model, and adopting a finite volume method to obtain a numerical solution of bottom-hole pressure; (4) calculating a bottom-hole pressure variation curve and a production rate variation curve in the well testing process of the hydrate reservoir, and drawing theoretical curves of bottom-hole pressure difference and pressure difference derivative; and (5) matching a measured pressure curve with the theoretical curve to obtain the relevant formation parameters.

The invention discloses a well structure design and method for exploiting geothermal energy and gas hydrate reservoir at the same time of water injection. The design mainly comprises a dual branch injection well and a horizontal producing well, wherein cold fluid is injected into the dual branch injection well, heated by a geothermal layer and returned to the gas hydrate reservoir; the self-carrying heat is transmitted to hydrate, and the hydrate dissociation is promoted. The method comprises the steps that a well group system which is composed of the dual branch injection well and the horizontal producing well is built on the sea level, wherein the dual branch injection well comprises a vertical mineshaft which extends from the sea level to the geothermal layer, a first branch mineshaft which is located on the gas hydrate reservoir and a second branch mineshaft which is located on the geothermal layer; the cold fluid is injected into a wellhead oil tube of the dual branch injection well, the cold fluid enters an oil sleeve annulus at the tail end of the second branch mineshaft and is subjected to heat exchange with the geothermal layer, after the heated fluid enters the gas hydrate reservoir, the heat is transmitted to the gas hydrate reservoir, the hydrate dissociation is caused, and mixed fluid which is composed of natural gas and injection fluid generated by the dissociation passes through a hydraulic power fracturing fracture under the gravity and pressure effect and is exploited by the horizontal producing well. According to the well structure design and method, the geothermal energy provides energy for the hydrate dissociation, the shortages such as low heat utilization efficiency and high exploiting cost in a traditional thermal excitation exploiting method are overcome, the device is simple, the operation is convenient, the economy is high, and the well structure design and method can provide guidance for reasonable exploiting of the gas hydrate reservoir.

The invention discloses an experimental simulation method for hydrate production and a confining pressure loading and thermal insulation integrated system. The confining pressure loading and thermal insulation integrated system comprises a refrigerating machine, a hydraulic press, a temperature sensor and a liquid cavity; the temperature sensor is connected with the refrigerating machine and is used for feeding the temperature of the surface of a sample back to the refrigerating machine; the refrigerating machine is connected with the hydraulic press and is used for adjusting the temperature of liquid of the hydraulic press into the temperature of the surface of the sample; the hydraulic press is used for inputting the liquid to the liquid cavity, wherein the temperature of the liquid is adjusted by the refrigerating machine; and the liquid cavity is connected with the hydraulic press and is used for supplying a confining pressure to the sample through the circulating liquid, enabling the sample to be isolated from the heat of environments, receiving the liquid input by the hydraulic press and outputting the circulated liquid to the refrigerating machine. The confining pressure loading and thermal insulation integrated system can provide a practical environment for the accurate testing of temperature variation caused by hydrate dissociation in the hydrate production process and is very beneficial to the scientific research and future field monitoring of hydrate production which gets more and more attention.

The present invention relates to a method of enriching a gaseous effluent in acid compounds, which comprises the following stages:

• • feeding into a contactor a feed gas comprising acid compounds and a composition comprising at least two liquid phases non-miscible with one another, including an aqueous phase, at least one amphiphilic compound and at least one mixture of promoters,
  • establishing in said contactor predetermined pressure and temperature conditions for the formation of hydrates consisting of water, promoters and acid compounds,
  • carrying the hydrates dispersed in the phase non-miscible in the aqueous phase through pumping to a hydrate dissociation drum,
  • establishing in the drum the hydrate dissociation conditions,
  • discharging the gas resulting from the dissociation enriched in acid compounds in relation to the feed gas.

The invention discloses an external discharge type continuous hydrate seawater desalination device, and belongs to the technical field of hydrate seawater desalination. The device comprises a high-pressure reaction kettle, a low-temperature seawater spraying system, a high-concentration seawater recycling system, a hydrate dissociation chamber and a gas intake and collection system. A gas hydration agent and seawater are introduced into the high-pressure reaction kettle to generate a hydrate, the hydrate is lifted out of the water surface for low-temperature seawater spraying by a hard filter screen, meanwhile, high-concentration seawater is discharged, seawater is reintroduced for next-step hydrate generation reaction, then a hydrate is discharged to the outer-layer hydrate dissociation chamber, dissociated fresh water is collected, and the gas hydration agent is collected and recycled, so as to implement highly concentrated production by virtue of a hydrate seawater desalination technology. At the same time of low-temperature seawater spraying, the high-concentration seawater is discharged and the seawater is reintroduced into the high-pressure reaction kettle to start a next-step hydrate generation process to implement continuous reaction for hydrate seawater desalination, so that the device is more compact in structure and more complete in function, and the economy is improved.

The invention belongs to the technical field of hydrate application, and discloses a spillover type continuous hydrate seawater desalination device. The spillover type continuous hydrate seawater desalination device comprises a reactor, a hydrate dissociation device, a spraying system, a gas circulating system, a water circulating system and a high-concentration seawater recycling system. A hydrate is separated from a solution by virtue of the difference that the hydrate and seawater have different densities, so that a hydrate seawater desalination technology can be industrialized. Moreover, hydrate generation and dissociation devices are combined in the same container, and an overturning controllable opening and closing device is utilized, so that the utilization efficiency of a material is improved, and the problem of pore plugging caused by hydrate generation is effectively solved. At the same time of low-temperature seawater spraying, high-concentration seawater is discharged and the seawater is reintroduced into an inner reactor to start a next-step hydrate generation process to implement cyclic production of fresh water by virtue of a hydrate method.

The invention discloses a gas hydrate dissociation and reaction liquid recovery device. The device comprises a three-phase separator, a gas hydrate dissociation unit, a carbon dioxide collection tank,an absorption liquid regeneration unit, a chemical absorption tower, an absorption liquid storage tank stored with an ethanol amine solution, a slurry pump, a counterbalance valve, a first anticorrosive pump, a second anticorrosive pump and a third anticorrosive pump. The device can be used for solving the problem of heat supply of hydrate dissociation; hydrate slurry entering a swirl chamber canbe kept in the chamber for a longer period, the slurry descends in the swirling process, gas rises, vacuum is formed in the swirling center in the swirling process, and hydrate dissociation is favored; an exhaust fan is beneficial to quick emission of dissociated gas, gas consumption can be reduced, and hydrate secondary generation which may possibly occur can be reduced; and as filter pores areformed in the conical bottom of the swirl chamber and the outer wall of the inner chamber of the lower chamber body, high-temperature regenerated gas enters inside the swirl chamber to perform heat convection with hydrate slurry, and the hydrate dissociation efficiency can be greatly improved.