210 results about "Horizontal branch" patented technology

The invention relates to a construction method for enhancing the extraction effect of a ground coal bed gas, comprising the following steps of: (1) constructing a vertical cave well, forging caves on coal beds with coal bed gases needed to extract, and placing fiberglass casings into the caves; (2) constructing a vertical well section and a lower branched main horizontal well hole of a horizontal well, respectively forwards constructing the lower branched main horizontal well hole and a horizontal branched well hole positioned in front of a lower branched cave after butting with the vertical cave well, returning to a position nearby the rear end of the vertical cave well and then constructing a horizontal branched well hole positioned at the rear of the lower branched cave; (3) after a lower branched well hole is constructed, carrying out side drilling to construct an upper branched well hole; (4) after an uppermost branched well hole is constructed, plugging inclined well sections of main horizontal well holes inside the horizontal well from a side drilling windowing point to a coal seeing point by using cementing cement; (5) drilling and flushing the vertical cave well, installing discharge and extraction equipment, and extracting the coal bed gas by discharging water and reducing pressure on the ground. The invention can shorten the construction period, reduce the construction and production cost, decrease the lands used for construction and extraction and enhance the extraction effect of the ground coal bed gas.

An implantable nerve stimulation device has a sensor system, a data processor in communication with the sensor system, and a nerve stimulation system in communication with the data processor and constructed to provide electrical stimulation to at least one branch of at least one vestibulocochlear nerve. The nerve stimulation system includes an electrode array that has a first plurality of electrodes structured to be surgically implanted in electrical communication with a superior branch of the vestibular nerve, a second plurality of electrodes structured to be surgically implanted in electrical communication with a horizontal branch of the vestibular nerve, a third plurality of electrodes structured to be surgically implanted in electrical communication with a posterior branch of the vestibular nerve, and a common erus reference electrode structured to be surgically implanted into a common eras of the vestibular labyrinth.

The invention discloses a horizontal branch multi-well-group butted well and a construction method thereof. The butted well adopts a distribution structure that a horizontal well corresponds to at least two vertical well groups; each vertical well group comprises at least two vertical wells; the vertical wells of each vertical well group are respectively communicated with the horizontal well at the target points respectively arranged at the bottoms of the vertical wells, so that horizontal mining channels which correspond to the vertical well groups one to one can be formed; and the target points arranged at the bottoms of the vertical wells are arranged in a target ore bed. By adopting a novel well drilling distribution form, the horizontal branch multi-well-group butted well enlarges the bare area of the ore bed, improves the mining efficiency, lowers the well drilling cost, reduces the construction period and reduces the mining risk.

The invention provides a loose blasting gas extraction method of a horizontal branch well of a coal seam floor. The method sequentially comprises the following steps of selecting a coal reservoir with a gas content of more than 8m3 / t and a solid coefficient f of less than 0.5; selecting 1-2 m coal seam floor as a layer of a main horizontal well and a branch horizontal well; determining positions of a ground well mouth and a deflection point according to the layer of the main horizontal well section; using a trisected structure as a well body structure and using open hole wells as the main horizontal well and the branch horizontal well; constructing the main horizontal well and the branch horizontal well in a selected floor rock layer; placing explosive points on the branch horizontal well section, wherein the explosive points are connected with each other by lines; and detonating all explosives through the ground; and mounting gas extraction equipment to extract the gas on the ground, wherein the gas can also be extracted at a negative pressure in a coal mining stage so that the well has multiple purposes. By using the method, the gas can be extracted on a soft coal ground to eliminate outburst and furthest reduce gas outburst disasters, and the gas (coal bed gas) resources can also be developed.

The invention relates to a coalbed methane (CBM) cluster double multi-branch horizontal well and a drilling method relative to discharging and mining vertical well system; the method includes: drilling the relative to discharging and mining vertical well according to the cluster wing position differences, finishing drilling the second section of the discharging and mining vertical well, adopting the completion method with lower sleeve at the upper part and naked eye at the lower part, the type of the sleeve is the combination of the steel sleeve and the glass fiber reinforced plastic sleeve; adopting the hole building mode for building the hole at the naked eye section by spraying, cutting the sleeved at the section with glass fiber reinforced plastic sleeve for forming the hole; adopting the building type deflecting mode for connecting the main well hole and the discharging and mining well hole in a long distance, drilling the horizontal branch section after finishing connecting; fixing and sealing the pocket of the discharging and mining well, washing the well, fixing and sealing the deflecting section, the branch wing can be used for production; finishing the other wings by the same process. The single well sweep area and the daily output are raised by the method, the construction cost is reduced, the security coefficient is increased and the construction period is shortened.

An implantable nerve stimulation device has a sensor system, a data processor in communication with the sensor system, and a nerve stimulation system in communication with the data processor and constructed to provide electrical stimulation to at least one branch of at least one vestibulocochlear nerve. The nerve stimulation system includes an electrode array that has a first plurality of electrodes structured to be surgically implanted in electrical communication with a superior branch of the vestibular nerve, a second plurality of electrodes structured to be surgically implanted in electrical communication with a horizontal branch of the vestibular nerve, a third plurality of electrodes structured to be surgically implanted in electrical communication with a posterior branch of the vestibular nerve, and a common crus reference electrode structured to be surgically implanted into a common crus of the vestibular labyrinth.

A new multi-branch well drilling and completion method relating to oil and geological exploration is that enters and seals a permanent positioning device 1 in the main well eye; so that the upper eye of the main well window is separated from the down well eye; After the positioning, it makes the oblique machine 6 after adjusting the tool angle on the ground is put into the main well eye, and is hang on the positioning device1. The conventional tool is put into the well to do the directionally opening window, drilling the well and putting the sleeve to fix the well and completing well. After drilling, the cowl milling machine 10 reclaims the overlapping segment of the tail pipe of the main well holes and the oblique machine 6. Repeating above steps, so it drills several horizontal branch well holes or directed branch well holes in the same main well hole, so it realizes the reliable positioning of the oblique machine. It can bear large drilling pressure and drilling torque, so it fully satisfies the opening windows, lateral drilling, milling, cowl milling and other construction sets; and it makes the main well diameter largest so that the oil production, ribbing well and oil layer reforming can perform normally. It can drill several branches in the same main well shaft and the number of branch well is not limited.

The invention relates to a drainage consolidation method without keeping drainage channel after work of a soft soil foundation, which can be recycled by a system. The method comprises the following steps of: impacting to form a hole by using a high pressure gun; pressing and burying a vertical drain filter pipe into the hole; connecting a flexible seepage filer pipe with the vertical drain filter pipe; connecting the other end of the flexible seepage filter pipe with a horizontal branch drain; connecting the horizontal branch drain with a horizontal main drain; paving geotextiles, and paving vacuum films on the geotextiles; connecting the horizontal main drain with a vacuum pump for vacuumizing; and detaching the parts, filling left holes, filling slag, excavating gutters, and impacting and compacting the slag layer by using impact compactor. The method overcomes the respective defects of the pile foundation technology, composite foundation technology and consolidated drained technology. In the method, recyclable vertical drainage filter pipe and horizontal main and branch drain structures are adopted, the construction cost is reduced, the field settlement after work is decreased, the transmission channel for vacuum pressure is widened, and the consolidation speed of the reinforced soil is improved.

The invention discloses a power-adjustable backward wave oscillator. The power-adjustable backward wave oscillator is characterized in that: by inserting upper and lower two rows of periodically complementary split-ring resonator structure into the middle part of a cavity of rectangular waveguide vertically, the complementary split-ring resonator structure has a relatively higher electric field resonant response at the slit of the opening, that is, between the horizontal branches of the two half parts, and shows the meta-material electromagnetic characteristic with a negative dielectric constant epsilon and a negative magnetic permeability Mu; longitudinal resonant field intensity is formed at the upper surface and lower surface of the periodically complementary split-ring resonator structure, thus being conductive to interaction between charged particles of band-shaped electron beams and electromagnetic waves; and at the same time, three electron beam channels are formed. Therefore, compared with a traditional relativism backward wave oscillator, the power-adjustable backward wave oscillator has higher coupling impedance and can obtain very high power output and electron efficiency. Besides, the structure enables one electron beam to work individually, or enables two electron beams or three electron beams to work, so that three kinds of adjustable power output of single beam, double beam and three-beam can be formed and then multi-band-shaped power can be adjustable.

The invention provides a single-well coal bed gas multi-branch horizontal well drilling and completion method. The method includes the steps that a vertical shaft section, an angle building section, an angle maintaining section and a hole angle increasing section are sequentially drilled from the ground, the tail end of the hole angle increasing section reaches a target coal bed, then at least one horizontal branch which is connected to a horizontal section is drilled in sequence along the target coal bed, and the hole drift angle of the horizontal branch is made to be larger than or equal to the hole drift angle of any point on the angle maintaining section and the hole angle increasing section; moreover, every time one horizontal branch is drilled, a sieve tube is tripped into the horizontal branch, and an annular gap is formed between the sieve tube and the horizontal branch; the upper portion of the angle maintaining section is used for placing water drainage and gas production equipment, and the angle maintaining section and the hole angle increasing section below the water drainage and gas production equipment are used as a bag. The single-well coal bed gas multi-branch horizontal well drilling and completion method changes the well drilling sequence of a traditional well drilling method, the sieve tube is tripped into each horizontal branch, thus safety production is achieved, and yield is increased.

The invention relates to a completion method for a natural-gas-hydrate large-borehole and multi-branch-radial-horizontal-borehole well. According to the technical scheme, the completion method includes the steps that a large-size drill bit is adopted to drill by a target well depth at a time to form a large main borehole, a plurality of horizontal branch boreholes are drilled in a natural gas hydrate reservoir with a radial horizontal well technology, and the contact superficial area between the reservoir and the boreholes is increased to the maximum degree. The completion method has the advantages that underground complex conditions in the exploitation process are avoided or reduced, and the number of the branch boreholes can be greatly increased; the bare area and the depth of the natural gas hydrate reservoir are increased to the maximum degree through the multiple branch radial horizontal boreholes, the recovery ratio is greatly increased, the number of distributed wells is decreased, and development investment is reduced; adopted window sealants, namely cement paste systems are stable, strength development is rapid, thickening time is adjustable, hydrate-layer sealing shallow-layer water-gas channeling can be effectively prevented, and good construction performance is achieved.

The invention provides a three-frequency-band high-gain omnidirectional dipole antenna comprising a three-frequency oscillator array, balanced feeder lines, a first dielectric plate, a second dielectric plate, and a third dielectric plate. The first dielectric plate, the second dielectric plate, and the third dielectric plate are arranged successively from top to bottom. The balanced feeder lines are arranged at the top surface and the bottom surface of the second dielectric plate and are printed along the axis direction of a three-frequency oscillator unit. The balanced feeder lines are parallel dual-line transmission lines. The three-frequency oscillator units in the three-frequency oscillator array are printed at the first dielectric plate and the third dielectric plate; and feeding points among all three-frequency oscillator units are connected by the balanced feeder lines. The three-frequency oscillator units consist of upper arms and lower arms, wherein the upper arms and the lower arms are arranged in a mirror symmetry mode. The upper arms and the lower arms include first branches, second branches, and third branches, wherein the first, second, and third branches are arranged along parallel axes; the second branches and the third branches are arranged at the two sides of the first branches symmetrically and the bottoms are connected into one by horizontal branches; and balanced feeding points are formed at central protrusions of the upper arm and the lower arm. The three-frequency-band high-gain omnidirectional dipole antenna has advantages of high gain, omnidirectivity, high efficiency, small size, and low cost; and an effective or benefical reference is provided for an optimized design of other multi-frequency or broadband high-gain omnidirectional array antennas.

The invention relates to a linear parallel-flow water-injection oil excavating method, belonging to the gas field excavating method technical field. The method is characterized in that a plurality of horizontal production wells and a plurality of horizontal water-injection wells are obtained by drilling an oil layer which is suitable for injecting water and excavating with the horizontal wells; the production wells and the water-injection wells are respectively arranged at a certain interval in a row; an injecting well drainage and a production well drainage are alternately arranged and are parallel with each other; the water-injection well and the production well are either single pitshaft horizontal wells or horizontal branch wells; two branches of each horizontal branch well have certain horizontal section lengths and have opposite directions in the same vertical plane; and the horizontal section of each horizontal well is perforated from up to down and is fractured so as to generate an eyelet or a crack, the crude excavation is carried out through injecting water from the water-injection well to the oil layer. The linear parallel-flow water-injection oil excavating method is applied, the fingering phenomenon of the injected water can be improved, the utilization rate of the injected water is improved, the production of residual oil is reduced, recovery percent of the water-injection oil excavating for oil is improved, the waste of oil resource is reduced, and economic benefits for oil-field development is improved greatly.

The invention discloses an experiment device and an experiment method for simulating blowout depressurization of a fourth-stage automatic depressurization system for a reactor. The experiment device comprises a pressure container, a T-shaped tube experiment section, a steam-water separator, a capturing water tank, a heating water tank, a second filter and a high-temperature pump, wherein a horizontal heat tube section of the pressure container is connected with a horizontal branch tube of the T-shaped tube experiment section; a vertical branch tube of the T-shaped tube experiment section is connected with the capturing water tank through the steam-water separator; the capturing water tank is connected with the heating water tank through a pipeline; the heating water tank is connected with a water inlet of the pressure container through the filter, the high-temperature pump and a preheating section. The experiment device can execute two experiments for converting air into water and converting steam into water; the air-to-water experiment can be used for executing mechanism-based experiments such as entrainment start and a steady-state entrainment rate, and the steam-to-water experiment can be used for executing the mechanism-based experiments and also executing a blowout pressure release simulation experiment of the ADS-4 (fourth-stage automatic depressurization system). The experiment device has the advantages of high safety, high experiment data precision, easiness in mounting and maintenance and the like.

The invention discloses a method for draining gas of a highly gassy coal mine. The method comprises the following steps of: 1, opening a downward drilling layer up to a specified depth, and performing surface casing well cementation to form a surface straight well section; 2, opening a side drilling window, making inclined drilling up to a landing point of a specified coal seam roof, and performing intermediate casing well cementation to form an inclined drilling well section; and 3, drilling in the coal seam roof from the landing point of the coal seam roof to form a plurality of broom-shaped horizontal branch wells, and draining the gas by using the plurality of broom-shaped horizontal branch wells. By the technical scheme, the gas can be quickly and effectively drained.

The present invention provides a kitchen modular water supply and sewerage device in one layer. It includes gathering water tank, stand pipe short pitch, water supply and sewerage piece connecting mouth installed on gathering water tank, sealing horizontal branch pipe connecting with stand pipe short pitch and closet outlet connecting sealing horizontal branch pipe, said water supply and sewerage device also includes gathering bucket, said gathering water tank is installed on the top of said gathering bucket, the lower of said stand pipe short pitch is installed in said gathering bucket, the lower of said gathering bucket is equipped with escape-pipe; the bottom of said gathering water tank is equipped with water discharging hole, said water discharging hole is connected with gathering bucket; said water discharging hole lower is equipped with water sealing device; said water discharging hole upper is equipped with overflow pipes. The water supply and sewerage device changes the installation mode of prior water supply and sewerage system, sets out leakage, odor, blocking and other technical problems in prior toilet water discharging, and the installation is convenient, users can choose toilet equipment placement themselves and the interior space is beautified.

The invention relates to the field of geothermal development, and provides a pressure crack network design and completion method for an enhanced geothermal system. The method comprises the steps thatthe upper portion of an igneous rock type hot dry rock is reached through drilling, a horizontal well section is drilled by using a guiding well drilling technology, multi-stage segmented hydraulic fracturing is utilized, a horizontal crack network is produced by utilizing layer-shaped brittle components in an igneous rock body, two horizontal branch wells located on the same horizontal plane witha water injecting well section are drilled at the end of the horizontal well section of a water injection well, the rear end of a crack of the horizontal well section of the water injection well after fracturing is conducted is penetrated to complete docking, a horizontal crack network passage with high seepage is constructed, fluid can enter in a well tube along the crack on which fracturing isconducted, and energy utilization can be conducted after the fluid is exploited to the ground surface. By adopting a branch well, a micro vibration detection and processing system and a hydraulic fracturing technology, a hot dry rock storage layer is effectively recognized, the storage layer is opened to the maximum extent, geothermal energy of the hot dry rock storage layer is fully utilized, andthe exploiting efficiency of the geothermal energy is significantly improved.

The invention discloses a split-flow automatic control system of a coal bed methane horizontal branch well. The split-flow automatic control system of the coal bed methane horizontal branch well comprises a ground manifold structure and an automatic control system, the ground manifold structure comprises a first mud input pipeline (A), a second mud input pipeline (B), a mud outlet pipeline (C), an auxiliary mud outlet pipeline (D) and a gas injection pipeline (E), and the automatic control system comprises a field sensor, a field bus (26), an industrial control computer (27), a programmable logic controller PLC (29) and an electric actuating mechanism. The invention further discloses a well drilling process of the system. The split-flow automatic control system of the coal bed methane horizontal branch well and the well drilling process of the system have the advantages of being capable of eliminating pressure fluctuation in a shaft caused by a switch pump and capable of adjusting opening of a throttling valve automatically, guaranteeing that pressure in the shaft remains stable, being capable of guaranteeing that a gas phase and a liquid phase are mixed evenly in a coal bed methane horizontal branch well aerated underbalanced process, and preventing large displacement drilling fluid from flushing well walls while guaranteeing drilling fluid rock carrying efficiency of a high-inclination well section.

Disclosed are a drainage system air pressure fluctuation test method and a device thereof; the device is composed of a water tank, a water supply and drainage pipe system and a test instrument; the water tank is arranged at a position which is more than 5 meters high; the water supply and drainage pipe system is composed of a water tank outlet pipe, a valve, a horizontal drainage pipe, a tee joint, a reducing elbow, a 45-degree elbow, a ventilation pipe, a horizontal branch pipe, a vertical drainage pipe, a horizontal discharging pipe and a triangle plastic plate; and the test instrument comprises a pressure sensor and a computer. The test method comprises the following steps: supplying the water tank with water, recording the water level calibration number of a glass tube outside the water tank, starting up the computer, opening the valve at an angle of 60 degrees and discharging water for 20 seconds; the closing the valve, recording the water level decrease value of the water tank, and calculating the average flow during the water discharging period based on data; repeating the test for three times for each flow, removing the data with irregular pressure fluctuation from the beginning of water discharging to the five seconds before the end of the discharging; and then taking the average value so as to get the pressure extreme value in the operating condition. The test method and the device are easy to use and operate, and provide a technical platform for improving the drainage flow pattern, reducing the air pressure fluctuation inside the standpipes as well as improving the water passing capacity of the water drainage system.

The invention discloses an orthogonal self-calibration branch double-ball decoupling six-dimensional force measuring platform. The orthogonal self-calibration branch double-ball decoupling six-dimensional force measuring platform comprises an upper platform, a lower platform as well as double-ball decoupling vertical force measuring branches and double-ball decoupling horizontal force measuring branches which are connected with the upper platform and the lower platform; each double-ball decoupling vertical force measuring branch of the force measuring platform includes a vertical branch upper supporting seat, a pressing end cover, a vertical branch lower supporting seat, a bearing plate, a decoupling steel ball, a positioning column and a single-dimensional two-way force sensor; each double-ball decoupling horizontal force measuring branch includes a horizontal branch upper supporting seat, a horizontal branch lower supporting seat, an tightening wedge block, a decoupling steel ball, a positioning column and a single-dimensional two-way force sensor; 3 to 36 double-ball decoupling vertical force measuring branches and double-ball decoupling horizontal force measuring branches are adopted respectively; the number of the double-ball decoupling vertical force measuring branches is equal to the number of the double-ball decoupling horizontal force measuring branches; and the double-ball decoupling vertical force measuring branches and the double-ball decoupling horizontal force measuring branches are evenly distributed between the upper platform and the lower platform. The orthogonal self-calibration branch double-ball decoupling six-dimensional force measuring platform of the invention has the advantages of simple structure, small inter-dimension coupling and high measuring precision, which is suitable for heavy-load and large-plane measurement occasions. According to the orthogonal self-calibration branch double-ball decoupling six-dimensional force measuring platform, mechanical decoupling is realized through the steel balls, and six-dimensional integral calibration is not required.

The invention relates to a liquid distribution device, and particularly relates to a uniform overflow type liquid distributor used for uniformly distributing liquid on a horizontal heat exchange pipe. The liquid distributor comprises a flange, a feeding pipe, a horizontal branch pipe, a spray pipe, a folded-plate type overflow groove, a connecting channel and liquid distributing teeth, wherein the flange is arranged at a feeding opening; one end of the feeding pipe is connected with the flange, and the other end of the feeding pipe is connected with horizontal branch pipe; the spray pipe and the horizontal branch pipe are not in central butt joint, and occurrence of liquid accumulation in the spray pipe can be avoided; liquid in the overflow groove slowly increases by using the spray pipe, so that liquid overflows stably and has small fluctuation.

The invention relates to a natural gas exploitation simulator of a multi-angle horizontal branch well, which is applied to a special physical simulation test of an unconventional natural-gas development horizontal well. The natural gas exploitation simulator is characterized in that: a multi-angle branch well model comprises a main pipe and branch pipes, wherein 4 to 12 branch pipes are welded on the main pipe and communicated with the main pipe, and an included angle between the central line of the branch pipes and the central line of the main pipe is within 25 to 65 degrees, and the length of each branch pipe is within 500 to 1000mm; a main pipe seal head is fixed at the liquid outlet end of the main pipe; end covers are arranged at the liquid inlet ends of the branch pipes and the main pipe, a pipeline and an injection pump are connected to each end cover, a flowmeter and a valve are serially connected to the pipeline, and a pressure sensor is also connected to the pipeline. The invention has the advantages of simulating technical parameters of exploitation fluids in multi-angle and multi-branch wells, researching the formation sand production situation and a sand washing process in the horizontal branch well exploitation process of unconventional natural gas and providing basic parameters of formation pressure distribution, water drainage and gas production systems, and the like for the unconventional natural gas exploitation.

The invention relates to a cultivation method capable of wintering brewing grapes, and belongs to the technical field of fruit tree cultivation. The method comprises the steps of brewing grape field planting, wherein firstly planting is conducted by opening deep furrows, line spacing is 2.0-3.0 m, plant spacing is 40-60 cm, the field planting furrows with the width of the section of 40-55 cm and the depth of 40-45 cm are dug before grape field planting, and the field planting furrows are filled with an organic fertilizer and surface soil evenly mixed according to the applied amount of the organic fertilizer of 5-10 m<3> every mu (a Chinese area unit and is equal to 666.67 m<3>) after the furrows are opened; pruning on the whole branches and wintering, wherein after the leaves are fallen in next autumn, a single-arm parallel dual-steer-wire frame building flabellate shaping mode with main branches of 35-40 cm and a flabellate shaping mode with the main branches of 35-40 cm are adopted to bundle the horizontal branches on the second wire; setting a brewing grape frame building mode, wherein a parallel dual-steer-wire frame building flabellate shaping mode is adopted, and the height of the whole frame of the galvanized iron rods is 2.1 m. The brewing grape is good in transparency, and bears uniform illumination, and the diseases and insect pests do not easily occur.

The invention discloses a guide support for accurate puncture under CT. A vertical rod is fixed on a base plate, and a cross bar is supported on the vertical rod. A counterweight is hung at one end of the cross bar, the other end of the cross bar is connected with a horizontal platform, and the counterweight and the horizontal platform are balanced. A horizontal branch piece is connected with the horizontal platform, a protractor is placed between a rotating lever and the horizontal branch piece, and the protractor is fixed on the horizontal branch piece. The rotating lever is connected to the horizontal branch piece in a rotating mode, a correction laser lamp is arranged at one end of the rotating lever, and a puncture guide piece is arranged at the other end of the rotating lever. The puncture guide piece is arranged on the rotating lever in a sliding mode, the puncture guide piece is parallel to a pointer of the protractor, and a laser needle is arranged in the puncture guide piece. The guide support is provided with a level gauge, and after correction, the puncture needle can be kept in the vertical plane; a laser positioning system is arranged, the plane where the puncture needle is placed can be perpendicular to the horizon and be perpendicular to the long axis at the same time, and therefore the plane of the puncture needle is completely consistent with the CT scanning plane.

The example of implementation of the invention provides a method used for exploiting a natural gas hydrate reservoir and belongs to the field of natural gas hydrate reservoir exploitation. The method mainly comprises a heat-injecting vertical well and a production horizontal well. The production horizontal well is opened in a segmental manner. In combination with natural gas hydrate heat exploitation, heat flow injected into the vertical well is enabled to heat different positions of the natural gas hydrate reservoir to increase a recovery ratio of the natural gas hydrate reservoir. The method specifically comprises the steps of injecting a heat flow into the natural gas hydrate reservoir by utilizing the vertical well to promote decomposition of the hydrate; firstly opening a horizontal branch of the horizontal well fully and keeping depressurization exploitation. When gas production amount is reduced to a certain degree, dividing a segmentation number based on permeability of the natural gas hydrate reservoir and performing segmental exploitation on the horizontal branch from a toe end to a heel end to realize heat exploitation of the heterogeneous natural gas hydrate reservoir. The method makes full use of a horizontal well structure, reduces exploitation cost and provides effective measures for efficient exploitation of the heterogeneous natural gas hydrate reservoirs.

The invention discloses a tree-like refuse leachate generated in landfill construction and closure as well as a landfill gas guide and exhaust system and method. The landfill gas guide and exhaust system comprises gabions, gas collecting shafts, horizontal branch gas collecting pipes, water guide blind ditches and a leachate collecting device, wherein the gas collecting shafts are arranged according to the slopes of a backfilling units of a refuse landfill and are enabled to be parallel to the axes of refuse dump backfilling units; one layer of branch gas collecting pipe is paved on every 1-2 backfilling units, and the branch gas collecting pipes communicate with the gas collecting shafts; the water guide blind ditches are arranged in a dump in a layered way, and every two adjacent layers of water guide blind ditches are communicated through the vertically arranged gabions; and the gas collecting shafts communicate with each layer of water guide blind ditch through the gabions. A tree-like guide and exhaust system is established for landfill gas and leachate according to the structure of the refuse landfill, the landfill gas and the leachate are connected and crossed by using pipelines, the arrangement of the water guide blind ditches in the vertical direction is omitted due to the communication of the gas collecting shafts and the water guide blind ditches, so that the collecting efficiencies of the landfill gas and the leachate are increased, meanwhile, the investment cost is reduced, and the landfill gas guide and exhaust system is safe and simple in operation.

The present invention relates to a method for eliminating the interference of the horizontal branch magnetic field of the geomagnetic field into the ampere rule experiment and an ampere rule demonstrator using the method. The N and S poles of magnet plates (4, 5) of the instrument are arranged in the mutually opposite way, and the magnetic induction of the uniform magnetic field generated in a local space in the magnet plates and that of the horizontal branch magnetic field of the geomagnetic field are equal in intensity but opposite in directions, so the vector sum is zero and the free surfaces of the rotation of a viewer (14) and magnetic needles (9) in the local space are all horizontal. When current passes through a vertical straight wire (20) penetrating through the center of the local space, the N pole of each magnetic needle (9) rotates to and dwells in the direction of a magnetic field generated where the current is positioned. If the straightened thumb of a right hand holding the straight wire (20) points to the direction of the current, the direction that the four bent fingers point to is the encircling direction of magnetic induction lines (17). This is the experiment which can directly demonstrate the ampere rule with the elimination of the horizontal branch magnetic field of the geomagnetic field.