90 results about "Methane clathrate" patented technology

A method is provided for in-situ production of oil shale and gas (methane) hydrates wherein a network of fractures is formed by injecting liquified gases into at least one substantially horizontally disposed fracturing borehole. Heat is thereafter applied to liquify the kerogen or to dissociate the gas (methane) hydrates so that oil shale oil and/or gases can be recovered from the fractured formations.

A method and apparatus for extracting methane gas from methane hydrate. The method includes heating the methane hydrate with a laser apparatus. The laser apparatus includes a diode laser or a solid state laser that is pumped with a diode laser. The laser is guided to a working end of a tool with a fiber optic bundle. The tool is guided to heat the methane hydrate with the laser, which emanates from a beam expander at the working end of the tool. The tool can be modified for removing obstructions of methane hydrate in pipelines. Also, the tool can be modified for extracting methane from mined methane hydrate, which is in a container. The characteristics of diode lasers or diode-pumped solid state lasers such as efficiency, size, nature of operation, environmental impact and durability, make methane gas extraction from methane hydrate economically feasible.

A pressure and temperature core sampler comprises a tool for recovering cores specifically enabling the evaluation of methane hydrate resources. Because methane hydrate tends to decompose under conditions of pressure decrease and/or temperature increase as the samples are retrieved to the surfaces a coring tool in accordance with the present invention provides a self-contained system for retrieving core samples at or near in situ pressure while cooling the core sample. The coring tool is preferably a wire line retrievable device that provides for nearly continuous coring during the drilling operation.

In one embodiment, this invention pertains to desalination of seawater by feeding methane into seawater at a depth generally exceeding 100 meters to form methane hydrate which rises to where it is decomposed into methane and water, and recoverig water. Methane is recycled to depth to form more buoyant hydrate.

A method is provided for in-situ production of oil shale, gas via gas (methane) hydrates and gas shale, and steam via geothermal formations wherein a network of fractures is formed by injecting liquified gases into at least one substantially horizontally disposed fracturing borehole. Thereafter, heat can be applied to liquefy the kerogen or to dissociate the gas (methane) hydrates so that oil shale oil and/or gases can be recovered from the fractured formations.

A towrope type ocean controllable source electromagnetism and earthquake data collection system is composed of electric field sensors (non-polarized electrodes) distributed in three or more towropes uniformly or not, three-component induction coil type or three-component fluxgate type magnetic field sensors and sonic sensors composed of hydrophones or accelerometers and is used for measuring ocean three-component magnetic-field components, electric field components EX distributed in the cable direction, electric field components EY distributed in the vertical cable direction and ocean earthquake data. The towrope type ocean controllable source electromagnetism and earthquake data collection system can collect ocean electromagnetism data and ocean earthquake data in the time domain and the frequency domain at the same time, increase the collection quantity of ocean geophysics data of advancing construction at a time in a multiplying mode, effectively improve the target detection precision and explore and evaluate ocean mineral products, oil and gas resources and methane hydrates through combination and comprehensive application of ocean controllable source time-frequency electromagnetism and the earthquake exploration technology.

The invention relates to a marsh gas purification method and a system thereof. The method comprises the following steps: keeping pressure below the pressure for the production of methane hydrate for the purpose of enabling carbon dioxide to react with sulfureted hydrogen to produce hydrate, and then separating methane gas from marsh gas. The marsh gas purification system comprises a marsh gas separating tank 6 and a marsh gas storage tank 1; liquid water is stored in the marsh gas separating tank 6; the marsh gas storage tank 1 is communicated with a compressor 2 through a pipeline equipped with a valve; the compressor 2 is communicated with the marsh gas separating tank 6 through a pipeline equipped with a valve; a refrigeration pipe 7 is coiled on the inner wall of the marsh gas separating tank 6; two ends of the refrigeration pipe 7 are mounted respectively on a refrigerator 8 positioned outside the marsh gas separating tank 6; the marsh gas separating tank 6 is communicated with a methane storage tank 9 through a pipeline equipped with a valve; and a marsh gas sampler A, a pressure sensor P, and a temperature sensor T are separately mounted on the marsh gas separating tank 6.

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.

The present invention relates to a method for recovering methane gas from natural gas hydrates. In particular, it includes the step of adding a gas mixture containing air and carbon dioxide to an NGH of deep sea and the step of replacing the methane gas with gas mixture and the step of decomposition-replacement of methane hydrate.

In accordance with the present invention, the invention is possible use as a technique for recovery of methane gas in the all-weather to induce replacement reaction using a gas mixture when the temperature of the technology applied is low and to induce degradation of solid methane hydrate by mixing gas when the temperature of the region technique is applied is high.

Further, the method makes it possible to reduce costs than using conventional methods because the air is collected directly from the NGH reservoirs and compressed and is injected as a mixture with carbon dioxide and, there is no need to transport the infusion another gas. The invention may be widely used in the production of natural gas more effectively.

A method for monitoring production from a methane hydrate reservoir includes obtaining a plurality of temperature measurements in a wellbore connected with the methane hydrate reservoir; and deriving a parameter relating to conversion of methane hydrate to carbon dioxide (CO₂) hydrate by injection of liquid CO₂, wherein the deriving uses a modeling program and the plurality of temperature measurements, wherein the modeling program uses at least one parameter relating to a thermodynamic properties that are substantially different between methane and CO₂. The at least one parameter relating to thermodynamic properties may include Joule-Thomson coefficients of methane and CO₂. The parameter relating to the conversion of methane hydrate to CO₂ hydrate may include a ratio of methane and CO₂ in a mixed fluid.

The invention discloses a pressing method for a methane hydrate containing rock core sample. The pressing method comprises the following steps: firstly, confirming the basic characteristics of an actual physical model; secondly, carrying out sediment compounding; thirdly, carrying out sediment pretreatment; fourthly, stirring and mixing a hydrate and the compound and pretreated sediment at low temperature; fifthly, manually pressing a rock core; finally, demoulding the pressed iron core. The pressing method has the benefit of better ensuring that the basic characteristics of the pressed methane hydrate containing rock core sample are basically consistent with those of a target reservoir.

A process and system for release and recovery of methane from subterranean methane hydrate deposits in which heated CO₂ is used to displace methane from the methane hydrate deposits and a portion of the displaced methane is routed to a combustion device proximate the deposit for combustion in-situ, generating heated CO₂ which is introduced into the deposit, displacing additional methane, a portion of which is routed to the combustion device, thereby providing a substantially self-sustaining process. Portions of the displace methane not routed to the combustion device are captured for use elsewhere.

The invention provides a method and system for collecting seabed combustible ice. An inverted funnel-shaped methane collector is released to the bottom of water through an offshore methane collecting boat, in other words, the collector is reversely buckled on a methane hydrate accumulation layer on the a seabed, and a hot water injection pipeline is arranged at the bottom in the collector. High-temperature seawater or steam is injected into the bottom of the collector constantly, the combustible ice is heated and decomposed, decomposed methane is continuously conveyed to the methane collecting boat through a collecting pipeline at the top end in the collector and is cooled and pressurized to be made into liquefied natural gas (LNG) or compressed natural gas (CNG) or the combustible ice again to be stored, part of the methane is used for heating seawater, the methane collecting boat is used for dragging the methane collector at the bottom of the water, and continuous large-scale production can be achieved in the whole collecting process. The method and system for collecting the seabed combustible ice have the advantages that methane hydrates can stop being decomposed only if injection of the high-temperature water is stopped, insulation measures are taken on the pipelines and container pots, and emissions only contain carbon dioxide.

The invention provides a method for exploiting methane hydrate by using stored carbon dioxide. The method comprises the following steps: selecting a methane hydrate soil layer at proper depth in a seabed, according to geological information, setting up a carbon dioxide injection well communicating from an ocean platform to the methane hydrate soil layer; injecting liquid state carbon dioxide into the carbon dioxide injection well, after the liquid state carbon dioxide diffuses and permeates into the methane hydrate soil layer, the liquid state carbon dioxide replaces with the methane hydrate, to generate methane gas; according to displacement efficiency of the carbon dioxide and the methane hydrate, determining exploitation time, and setting up a methane exploited well in the replacement range of the carbon dioxide injection well, the methane exploited well communicating with the methane hydrate soil layer, so as to realize exploitation of methane gas. After the carbon dioxide is injected and stored, the carbon dioxide would replace the methane hydrate in the regions in a permeating and flowing process, mechanical property variation of the stratum in the process is little, and geological disasters caused by air exhaust exploitation of the methane hydrate are prevented, and greenhouse gases are reduced.

The invention discloses a device for efficiently exploiting natural gas hydrate by adopting flue gas of a power plant. The device comprises a gas booster, an injection well, an overlying formation, an exploiting well, a turbine expansion device, a membrane separation device and a decarburization device, wherein the gas booster is connected with the injection well; the exploiting well is connected with the turbine expansion device, the membrane separation device and the decarburization device sequentially. With the adoption of the method for exploiting the hydrate, the recovery rate of methane is higher; the exploiting mode is more environment-friendly, and CO2 is sealed and stored while methane hydrate is exploited; energy consumption is lower.

A process for converting latent heat of water vapor, appearing with non-condensable gases expelled into the atmosphere, into more useful forms of energy, such as process steam/electricity. It uses pressurized direct contact heat exchange systems to achieve this conversion at high thermal efficiencies. When pressure combustion is used in combination with pressurized water electrolysis it produces pressurized by-product hydrogen which can be used to extract methane from methane hydrate ice located below the earth and sea.

A system for producing Methane from a Methane Hydrate formation including a completion that is disposed through a Methane Hydrate formation. An inlet of the completion disposed in the Methane Hydrate formation; and a drain for water located in a direction proximate a direction of gravity relative to the Methane Hydrate formation and gravitationally beneath the Methane Hydrate formation. A method for producing methane from a Methane Hydrate formation

The invention discloses a methane hydrate collecting device for a shallow stratum. The device comprises a gas pumping tube and a central rod; a moving block is fixed to the tail end of the central rod; a plurality of heating tubes which are connected in parallel are fixed on the outer wall of the moving block. The device further comprises a collecting cover with an arc-shaped cross section; an annular groove is formed in the outer wall of the gas pumping tube; a plurality of balls are mounted on the inner wall of a through hole; the upper side and the lower side of the collecting cover are respectively connected with the inner walls of two sides of the annular groove through elastic rubber rings; a reflecting plate is mounted on the inner wall of the collecting cover; the thickness of the reflecting plate is gradually increased from the center to two ends; a plurality of reflecting bulges with triangular longitudinal sections are arranged on the inner wall of the reflecting plate. According to the device, combustible ice can be decomposed by grades through the collecting cover and the moving block, so that the heat of the combustible ice can be slowly diffused, the combustible ice cannot be overflowed due to excessively fast decomposing while continuously pumping methane through the gas pumping tube, the influence of production of combustible ice on the environment can be avoided, and as a result, the purposes of increasing the production rate and improving the safety and reliability can be achieved.

The invention provides a hydrate phase change process visualization CT (computer tomography) device based on a high pressure throttling temperature control technology, which belongs to the technical field of basic research on hydrates. High pressure gas enters a temperature control pool through a gas pump and a low temperature probe; the high pressure gas can be used for realizing temperature control through throttling expansion heat absorption of the low temperature probe; the temperature control pool is connected with a reaction pool by a self-operated pressure regulating valve; the pressurein the reaction pool can be controlled by the self-operated pressure regulating valve, so that the generation and decomposition of methane hydrate can be controlled. An outlet gas pump is connected with the temperature control pool, so as to control the pressure in the temperature control pool. The generation and decomposition process of the methane hydrate is scanned by X-ray CT timely. A high pressure gas throttling low temperature device is combined with the X-ray CT, so that the temperature can be controlled by throttling expansion of high pressure methane, and the problem that the temperature is relatively difficult to control as a reaction kettle rotates in the X-ray CT scanning process is solved. A three-dimensional structure of the generation and decomposition process of the methane hydrate on the surface of a porous medium can be visually observed through combination with the X-ray CT scanning, so as to provide basic data for a research on numerical simulation of generation and decomposition of the hydrate.