The invention discloses an underground in-situ fluid microwave electric heating method and microwave electric heater. As microwave heated water is underground critical water, water introduced into the ground is heated at a target layer, the water in the underground high pressure environment can be heated to a critical state, oil shale is thus cracked to produce oil gas, the oil gas is dissolved into the near-critical water, and the near-critical water is circulated to the surface via a circulating system and separated to obtain an oil gas product. The method is simple, energy-saving, high in exploitation efficiency, high in heating speed and heating efficiency and low in thermal inertia, has a catalytic effect on chemical reaction, is low in loss of heat transferred to the well bottom, reduces the exploitation cost and improves the energy exploitation rate.

Underground in-situ fluid microwave electric heating method and microwave electric heater

The invention belongs to the field of hydrate generation and conveying, and particularly relates to a natural gas hydrate pipeline transportation method and device. The natural gas hydrate pipeline transportation device comprises a hydrate generation unit and a hydrate transportation and separation unit. The natural gas hydrate pipeline transportation method comprises the steps of hydrate generation and hydrate transportation and separation. The pipeline jamming is avoided through the physical hydrate conveying method and other methods, and the natural gas hydrate pipeline transportation method and device are safe, reliable and high in feasibility; the economic applicability of combustible ice is also improved; the economic benefits are improved compared with traditional natural gas pipeline conveying; by the adoption of different treatment methods, the comprehensive utilization efficiency of the system is greatly improved, and convenience is provided for utilization of novel clean energy in twenty-first century.

Natural gas hydrate pipeline transportation method and device

The embodiment of the invention provides a downhole electric heating horizontal well pipe column structure and an oil layer heating method thereof. The downhole electric heating horizontal well pipe column structure comprises a casing pipe assembly and a radiofrequency current transmission channel which is located in the casing pipe assembly and is in clearance fit with the casing pipe assembly. A plurality of radiofrequency antenna assemblies are installed at the lower end of the horizontal section of the casing pipe assembly, connected in sequence and linearly arranged in the extension direction of the horizontal section of the casing pipe assembly. The casing pipe assembly and the radiofrequency antenna assemblies are isolated in an insulating mode, and the adjacent radiofrequency antenna assemblies are isolated in an insulating mode. Each radiofrequency antenna assembly comprises a radiofrequency antenna connector coupled to the radiofrequency current transmission channel, and two radiofrequency antenna arms coupled to the radiofrequency antenna connector; and the two radiofrequency antenna arms produce radiofrequency signals which are used for heating an oil layer. According to the embodiment of the downhole electric heating horizontal well pipe column structure and the oil layer heating method thereof, the oil layer heating uniformity is improved, and the oil reservoir recovery ratio is increased.

Downhole electric heating horizontal well pipe column structure and oil layer heating method thereof

In the heat conveying process of a crude oil pipeline, the pipeline needs to be maintained and overhauled periodically, or conveying needs to stop temporarily when accidents happen to the pipeline, so that serious consequences, that is coagulation and blocking of the pipeline, may occur in the restart process of conveying or after leakage accidents happen to the pipeline, the serious consequences are undoubtedly disastrous to the crude oil pipeline, and if plugging relief or dredging cannot be performed on a crude oil coagulation section, the coagulation section may be longer and finally a whole pipeline system is paralyzed and scrapped. The invention relates to a plugging relief and dredging method device for the crude oil pipeline. The device mainly comprises an external motor (1), a drill bottom folding frame (2), a rotary joint (3), a head drill (4), a drill bit (5), the crude oil pipeline (6), a crude oil coagulation part (7), a stirrer (8), a stirring head (9), a heater (10) and a heating pipe (11). The device is mainly applied to plugging relief and dredging after crude oil pipeline coagulation.

Plugging relief and dredging method and device for crude oil pipeline coagulation section

The invention discloses a method for exploiting natural gas hydrates by means of microwave heating by the aid of row type horizontal wells, and belongs to the field of technologies for exploiting natural gas hydrates. The method includes arranging row type horizontal well networks for target reservoirs by the aid of geological data and carrying out matched well completion operation for the targetreservoirs by the aid of the geological data; carrying out depressurization exploitation by the aid of the horizontal wells after well completion is carried out until economic benefits are unavailable; arranging ground supply systems and downhole microwave systems at heat supply wells; heating natural gas hydrate layers by the aid of microwave heaters; collecting natural gas and produced water from production wells. The method has the advantages that well arranging modes are flexible, different well sites and well depths can be selected according to actual reservoir conditions, accordingly, the natural gas hydrate reservoirs can be optimally exploited, the gas production efficiency can be improved, and the economic benefits can be increased.

Method for exploiting natural gas hydrates by means of microwave heating by aid of row type horizontal wells

The invention relates to a technology for exploiting natural gas hydrates by means of microwaves, which can be regarded as one of methods for exploiting natural gas hydrates by a thermal excitation method. However, the method is different from the conventional thermal excitation method. The technology of exploiting natural gas hydrates by means of microwaves is mainly based on three theories: heating effect, seam creating effect and non-thermal effect. As the natural gas hydrates are polar materials, the natural gas hydrates have certain adsorption effect on microwaves (the dielectric constant of the natural gas hydrates is about 58 which is slightly less than that of ice), thereby providing a good theoretical base for feasibility of heating the natural gas hydrates by means of microwaves. As microwave heating is body form heating, thus, the decomposing time of the natural gas hydrates is further shortened. The invention provides the method and device for exploiting natural gas hydrates by means of the microwave technique. As the microwave heating method is high in acting speed, simple in device, high in flexibility, low in investment and free of any pollution to reservoir stratums, so that the method and device are suitable for exploiting any type of hydrate resource, which has very important practical significance to the exploiting industry of natural gas hydrates.

Method and device for exploiting natural gas hydrates by means of microwave technique

At present, natural gas is transported mainly by long-distance pipeline transportation in China, but the long-distance pipeline transportation has the shortcomings of being immense in initial investment, high in pipeline pressure and low in safety factors. When natural gas is transported inside pipelines, constant pressing is needed, so that the pressure of the end of the pipelines and city gate stations can reach 30 Mpa. Accordingly, requirements of the pipeline are extremely high. As the time goes by, the rigidity and flexibility of the pipelines are reduced due to the facts that the pipelines are oxidized, corroded by water vapor and hydrogen sulfide in natural gas and abraded by mixed solid particles, so that potential risks and economic benefit of the pipelines are very challenging. The invention provides a natural gas transportation method and a device thereof based on hydrate technology, and the natural gas transportation is characterized by being high in transportation capacity, high in safety factors, low in preset requirements and cost, and applicable to middle and long-distance (1000 to 12000 km) natural gas transportation.

Natural gas transportation method and device thereof based on hydrate technology

Natural gas hydrate exploitation by use of microwaves can be regarded as one kind of thermal activation exploration for natural gas hydrate. The utility model relates to a device using microwave technology to explore natural gas hydrate. The device is divided into a natural gas hydrate exploration device and a natural gas collecting device. The natural gas hydrate exploration device is mainly formed by a computer central control system, a sealing ring, a control wire harness and a microwave emission and control device. The natural gas collecting device is mainly formed by a floating disc control circuit, a natural gas collecting well, a movable floating disc, a floating disc lowest position limit pin, a natural gas purifying device and a natural gas storing device. By use of microwave heating method, the device is fast in speed, simple in structure, highly flexible and low in investment, will not cause any pollution for a storing layer, and is suitable for exploring any kind of hydrate resources, which is of a considerable practical significance for natural gas hydrate exploration business.

Device using microwave technology to explore natural gas hydrate

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