272results about How to "Good water blocking effect" patented technology

The invention discloses a long tunnel fast construction process. The tunnel construction method in the direction from the entrance to the exit and the tunnel construction method in the direction from the exit to the entrance are the same and each construction section is respectively constructed from back to front. The construction process is as follows: 1, excavating construction at an initial construction section, the process is as follows: performing advance geology forecast, determining the excavating construction method for the current construction section, excavating and primary supporting; 2, excavating construction at the next construction section; 3, repeating the step 2 for multiple times until the construction tunnel is through, wherein in the tunnel construction process, found water seepage areas are timely subjected to draining treatment, and the secondary lining construction is synchronously performed on the tunnel holes formed by excavating from front to back. The long tunnel fast construction method is reasonable in design, simple and convenient in construction, safe in the construction process, short in construction process and fast in construction progress, thus effectively solving the defects and shortcomings such as large equipment investment, long construction period and slow construction progress of the existing long tunnel construction.

The invention relates to a hydrophilic double-component grouting plugging material. The hydrophilic double-component grouting plugging material comprises a component A and a component B with a grouting volume ratio of 1: 1-5, wherein the component A comprises the following substances in parts by weight: 100 parts of polyether polyol, 10-50 parts of a plasticizer, 20-60 parts of isocyanate, 0.05-0.3 part of a catalyst, 20-60 parts of a solvent and 0.01-0.05 part of a retarder; the component B comprises the following substances in parts by weight: 100 parts of sodium silicate, 2-5 parts of a cross-linking agent and 0.5-2 parts of a catalyst. The plugging material related to the invention also has the characteristics of environment protection, no pollution, low cost and high dynamic strength besides the properties of great grouting capability, high gelatinizing speed, large water containing quantity and rapid and efficient seepage-proof plugging. The grouting plugging material is suitable for the grouting plugging of various buildings, such as ponds, water towers and basements, and the grouting plugging engineering of various ports, docks, bridge piers, dams and hydropower station curtains.

The invention relates to a vertical shaft wall structure in a bad stratum and belongs to mine vertical shaft construction. The vertical shaft wall structure comprises a shaft arranged in the bad stratum and is characterized in that the upper shaft collar section of a vertical shaft is provided with a high-pressure-jet-grouting curtain pile shaft wall structure, a bedrock section is provided with a positioning targeting grouting section shaft wall structure and a shaft wall, and the upper and lower shaft wall structures are concentric, identical in diameter and tightly integrally connected to protect the shaft wall; the high-pressure-jet-grouting curtain pile shaft wall structure is provided with at least three circles of annular high-pressure-jet-grouting curtain walls with sealed heads and tails on the periphery, 0.6m away from a shaft outer diameter line, of the shaft outer diameter line by using the center of the shaft as the circle center, the positioning targeting grouting section shaft wall structure is provided with at least 8 positioning targeting grouting sections, vertical to the ground, on the periphery, 2m away from the shaft outer diameter line, of the shaft outer diameter line, and the two wall structures protect the shaft wall. The vertical shaft wall structure has the advantages that the vertical shaft wall structure is novel in concept, simple, stable and reliable; the high-pressure-jet-grouting curtain walls and the positioning targeting grouting sections protect the shaft wall, bearing capacity and deformation resistance are enhanced, and a good water blocking effect is achieved; the vertical shaft wall structure is fast and convenient in construction, fast shaft construction can be achieved, cost can be saved, and mine production can be performed safely and smoothly.

The invention relates to a water block operation method for horizontal wells, in particular to a binary composite technique method of sealing and water block for horizontal well downholes; the invention is characterized in that dynamic and static data of wells under execution are analyzed prior execution, in order to determine filler consumption into a binary system; then, perform well killing with fresh water before filling forced hardening flue, mixed in certain proportion of polyropylene amide, resorcinol and urotropine, and nitrogen into the well through the oil pipe; form a partition board with the filled nitrogen, and block off the water cone formed by bottom water layer in the horizontal well; the method can both improve utilization rate of medium and low permeation layers, and effectively control high permeation water content, in order to reach the target of improve collection rate of horizontal wells. The method in particular adapts to blocking for high-permeation water bearing layers in horizontal wells.

The invention belongs to the field of chemical synthesis, and particularly relates to a novel chemical grouting material for coal-rock mass water shutoff and reinforcement and a preparation method thereof. The chemical grouting material provided by the invention is prepared by mixing a component A and a component B at a volume ratio of 1:1, wherein the component A is prepared by proportionally mixing liquid sodium silicate, small-molecular alcohol and a catalyst; and the component B is prepared by proportionally mixing polyphenyl polymethylene polyisocyanate and a viscosity reducer. The chemical grouting material provided by the invention has the characteristics of low raw material cost, good permeability, fast curing, high adhesive force with a coal bed and high solidification strength; and particularly, the material does not foam in water, the water shutoff and reinforcement effects can be perfectly realized, the related raw materials are green and pollution-free, and the material does not contain volatile solvents or generate any poisonous gas and completely meets the requirements in use and environmental protection of coal mine water shutoff and reinforcement materials.

The invention discloses a crack plugging agent based on expansion particles and solidifiable particles, and belongs to the technical field of profile control and water plugging of an oil field. The crack plugging agent is composed of the expansion particles and the solidifiable particles which are separately stored, the mass ratio of the solidifiable particles to a solidification agent is 100:(5-20), and the content of the expansion particles is indefinite; the solidifiable particles are prepared from a solid core and film-coated resin in a mass ratio of 100:(5-15). The solidifiable particlesare high in strength, high in temperature resistance and salt tolerance and wide in oil reservoir applicability; an immovable plug formed by the solidifiable particles has an interception function ofa screen net, the breakthrough pressure gradient of the expansion particles in cracks can be obviously improved, the expansion particles are forced to remain in the cracks to continue to give play toa water plugging effect, meanwhile, the immovable plug has a penetration capacity, water, a gel breaker and the like are allowed to pass through the immovable plug so as to remove plugging of the expansion particles, and the crack plugging has restorability. The crack plugging agent has a good water plugging effect in water plugging of the oil field.

The invention discloses a nano micro-pore air purification net and a preparation method thereof. The nano micro-pore air purification net is made of a gauze element base material and a nano micro-pore membrane, wherein the nano micro-pore membrane is adhered to the gauze element base material and is made of cured colloid and nano fiber short chopped strands; the nano fiber short chopped strands are adhered to the cured colloid in a criss-cross manner, thereby forming micro-pores of which the diameters range from 0.1 micron to 2.5 microns. Therefore, when external air enters a room through the nano micro-pore air purification net, granules of which the diameters are greater than 2.5 microns can be baffled outside the room; due to adoption of nano fiber, pollen can be effectively isolated, and intense ultraviolet light can be also cut off; dew is not easy to form on the nano micro-pore membrane, and even when attached to the nano micro-pore membrane, rain cannot be blown into the room easily. As the nano fiber is subjected to special fluorine treatment in the preparation process, the nano micro-pore air purification net can be automatically cleaned when water or rain is sprayed on the nano micro-pore membrane without detachment, and dirt adhered to the nano micro-pore membrane can be easily blown off by using an air blower.

The invention discloses a high dam reservoir ultra-deep water retaining and emptying system and an operation method thereof. The water retaining and emptying system comprises first to last stage gate systems and a last stage radial gate system, and the first to last stage gate systems are sequentially arranged on a tunnel; each stage gate system is provided with communicating pipes with water supplement and draining functions, and the communicating pipes perform water flow control by means of valves; all the stages of gate systems achieve water pressure and air pressure balance through the inner and outer communicating pipes, the outer maintaining communicating pipes, ventilation pipes, galleries and the like of the gate systems respectively; the last stage gallery is communicated with the down stream of the water retaining and emptying system through a gallery shaft. The operation method includes four working conditions of water storing, water emptying, maintaining and water retaining. According to the high dam reservoir ultra-deep water retaining and emptying system and the operation method thereof, multiple stages of gates are disposed so as to share burden with a gross head; water filling is performed in rear of each stage of gate so as to counteract the pressure of water retaining heads, and hydraulic thrust which each stage of gate tolerates can be kept within a conventional design range; the defects of metal structures in the prior art can be overcome; the key technical problem of ultra-deep water retaining and emptying designs in the high dam reservoir engineering can be solved.

The invention discloses a liquid division slip casting reinforcing method for subsurface structure construction joints, mainly aiming at the problems that as the subsurface structure construction is severely influenced by ground water, the peripheral structure leaks water, the material strength is reduced, the structure integrity is poor and the like. A purpose-made grouting pipe is arranged at the construction joint of a structure connector with weak stress in the process of subsurface structure peripheral construction, and the liquid division slip casting reinforcing operation is performed based on a designated method, thus making up for the defects of poor rigidity and poor waterproof effect at the construction joint of the subsurface structure preferably. The method in the invention has good grouting effect and high grouting success rate, can effectively improve the strength and the integrality of the subsurface structure, and reduce the leakage of the construction joint of the subsurface structure.

The invention discloses a preparation method of a selective water plugging agent and belongs to the technical field of high molecular materials. The preparation method comprises the following steps: mixing a pre-treated mixed solution and a silane coupling agent according to the mass ratio ranging from (80 to 1) to (100 to 1); adding modified graphene oxide which is 0.03 to 0.09 time of the mass of the pre-treated mixed solution, epoxidized soybean oil which is 0.01 to 0.02 time of the mass of the pre-treated mixed solution and a catalyst which is 0.008 to 0.009 time of the mass of the pre-treated mixed solution; after stirring and mixing, adding an initiator which is 0.01 to 0.03 time of the mass of the pre-treated mixed solution; after stirring and reacting, obtaining a blank mixture; filtering the blank mixture; and washing, drying and crushing to obtain the selective water plugging agent. The selective water plugging agent disclosed by the invention has excellent selective permeability and water plugging performance.

The invention discloses a machine for forming underground continuous water-retaining walls by one step, which relates to a machine for building underground continuous water-retaining walls on mudflat sections and dam bodies beside rivers, lakes and seas. The machine comprises a tracked chassis, a stand, a turning angle chassis, a grooving system installed on the turning angle chassis, a bar arrangement system, a concrete pouring basin, a power system installed on the stand, an electrical apparatus control cabinet and a hydraulic control cabinet, wherein the grooving system is a chain-type uninterrupted clamshell excavator which can ascend upwards, descend downwards, keep upright in operation and lie obliquely on the stand in transition transporting; and the bar arrangement system and the concrete pouring basin are arranged at the back side of the grooving system. The machine can complete all the operations of digging ground grooves, arranging steel bars and pouring concrete. The machine provided with a diesel engine is fitted with an on-vehicle concrete mixer and has the advantages of flexible transition operation and high working efficiency. The depth of a wall body is adjustable, and a formed wall has favorable quality. The machine can also utilize commercial power of a construction site as power.

The invention provides a method for conveniently and rapidly blocking stratum flowing water and pores. Acrylic silk wadding is used to form a filter screen for emitted water, subsequently, polyurethane slurries in different prescriptions are injected into water passages and acted with water to rapidly foam to form polyurethane foams, under the chemical combination and physical mixing effect generated at the position of the acrylic silk wadding, and the acrylic silk wadding rapidly forms an elastic rubber plug structure to block various water passages, cracks and water flows. According to the needle injection type grouting method, burying and blocking grouting steel tube processes in grouting construction are omitted, grouting work efficiency is improved, and construction difficulties in grouting and plugging of flowing water are reduced; reasonable drilling and water diversion solutions are used, and grouting prescriptions and grouting backfilling processes are reasonably deployed, so that grouting slurries seep into deeper places of a stratum along water flow passages to block water flows, and better water blocking effects are achieved.

The invention relates to a split mounting type steel suspension box. The split mounting type steel suspension box comprises a sidewall and a bottom board which are provided with structure beams and surface plates, wherein the sidewall comprises a plurality of unit side plates which are provided with the structure beams, and the surface plates of the unit side plates are rectangular; unit plate connecting sides are arranged at four sides of the unit side plates; the adjacent unit side plates are interconnected through the unit plate connecting sides to form the sidewall; a bottom board connecting side is arranged around the bottom board; the unit plate connecting sides of the unit side plates are connected with the bottom board connecting side of the bottom board. The split mounting type steel suspension box has the beneficial effects that standard profiles being high in structure intensity, flat in processing surfaces, regular in connection and high in matching accuracy are used as the connecting sides of the sidewall and the bottom board, so that the water stopping effect of the steel suspension box can be obviously improved; in addition, the split mounting type steel suspension box is conveniently processed, and the construction cost can be reduced.

The invention relates to a non-woven fabric and a production method thereof, in particular to a powderless, water-swelling and non-woven fabric and a production method thereof. The powderless, water-swelling and non-woven fabric is applicable to cables and optical fibers or can be also processed into household articles, medical and health material, and the like. The powderless, water-swelling and non-woven fabric is formed by adopting a self-made solution with macromolecular hydroscopicity by high-temperature curing and crosslinking in a fiber saturating and gumming link for producing the non-woven fabric. The invention adopts the self-made solution comprising compounds capable of forming the macromolecular hydroscopicity by the high-temperature curing and crosslinking in the fiber saturating and gumming link in the production technology to form the non-woven fabric with water-swelling function. The non-woven fabric can be directly applied to cables, optical fibers or other civil fields. The invention has simple technology, stable technical performance and excellent waterproof effect.

The provided new building material consolidated at normal temperature is prepared mainly by castoff of building and mine or power plant, controllable on consolidation time and strength, has well physical performance with permeability coefficient less than 5e-7cm / s and compression strength up to 7MPa or 22Mpa as building block, reduces unit cost more than 45%.

The invention relates to a water bursting emergency water blocking method and a water blocking device, and discloses a water blocking method and device, wherein the water blocking device is fixedly mounted by cooperating with anchor rods, and blocking is conducted through airbag inflating expansion. The water bursting emergency water blocking method is characterized by comprising the steps: the water blocking device is expanded, and the four corners of the water blocking device are connected and fastened with the support anchor rods; an outer connecting sleeve on the water blocking device communicates with an external pump body; a layer of anchor mesh is laid on the surface where the water blocking device is fixed, and fixed through the anchor rods, and the water blocking device is fixed;the water blocking device is filled by starting the external pump body; the water blocking device is gradually expanded, meanwhile, the anchor mesh is fastened, the expanded water blocking device is fixed, and thus the water blocking device can be tightly attached to the rock wall initially; and the water blocking device is completely filled and completely attached to the rock wall, emergency water blocking is completed, and subsequent reinforcement work is conducted. The water blocking method is simple, mounting and fixing are conducted based on the original support anchor rods, and the situation that fixing lacks in supporting is avoided.

The invention discloses a comprehensive mining technology of a drowned well, comprising the step 1: stratum unblocking pretreatment prior to water plugging; step 2: shallow plugging; step 3: deep plugging adjustment; and step 4: hydraulic deep penetration perforating and oil production recovery of an oil well. According to the characteristics of the drowned well, multiple mature technologies are organically comprehensively applied, with the combination of first dredging and subsequent plugging, the problem that no oil is produced after plugging is effectively solved. By first shallow plugging and subsequent deep plugging adjustment and in combination with hydraulic deep penetration perforating, the period of validity of mining is effectively prolonged and the input-output ratio is improved.

The invention discloses a swash-type indoor air purifier which mainly removes indoor bug dust, fungus and volatile organic compounds. The swash-type indoor air purifier mainly consists of an air inlet, a water feeding opening, a minimum / maximum liquid level indicator, a water storage tank, a water discharge opening, a first air blocking plate, a second air blocking plate, an S-shaped passage, a first water baffle, a second water baffle, a fan, a wind pipe, an charcoal absorption unit, an electric heating unit, a plenum box and a porous plate air supply opening. The swash-type indoor air purifier adopts the swash-type dedusting principle to remove the bug dust and fungi microorganisms. Due to the arrangement of the two water baffle plates, the impact brought by water drops to charcoal absorption function is prevented. The charcoal absorption unit is arranged to treat the indoor volatile organic compounds. In order to prevent the cold wind from blowing into the room in cold seasons, a heating unit is specially arranged and whether to heat is the option of a user. An air outlet adopts a plenum box and porous plate air supply system so that the air supply has a uniform speed field and a uniform flow field.

The invention belongs to the field of oilfield development technologies, and in particular relates to an oil-in-water emulsion for horizontal well water plugging and a preparation method of the oil-in-water emulsion. The emulsion is prepared from the following preparation materials in parts by weight: 30-40 parts of thickened oil, 60-70 parts of deionized water, 0.1-0.2 part of a water-soluble surfactant, 0.2-0.3 part of an oil-soluble surfactant and 0.1-0.2 part of a stabilizer. The emulsion disclosed by the invention has the advantages of simple preparation process, low cost, low initial viscosity and simplicity in injection; the coated high-viscosity thickened oil phase is released after demulsification or phase inversion, or a viscous oil-in-water phase is further formed, so that the water outlet is subjected to safety plugging; the plugging agent is high in selectivity, is inversed with highly mineralized water to become viscous for plugging, and is invariable when meeting oil. The product disclosed by the invention has the initial viscosity of being lower than 10 mPa.s, the plugging rate is 85% or higher, and the water plugging effect is good.

The invention provides a displacement exploitation method for heavy oil reservoir after artificial foam primer and steam flooding. The method comprises: selecting a target oil reservoir and a target well group; stopping a well group steam injection and oil exploitation process, and injecting an artificial foam oil primer slug and a gas slug into injection wells; opening wells to exploit oil when formation pressure rises so that bottom-hole static pressure of a production well reaches a set value; after injecting the gas slug, continuing the inject steam to the injection wells, judging whether injection transfer conditions and lower economic limit are satisfied or not, and determining whether to continue oil exploitation or stop oil exploitation. By using an artificial foam oil primer in the method, it is possible to reduce crude oil viscosity and surface tension for a near-wellbore formation, gas is dispersed in micro bubble form in oil-in-water emulsion, rheological properties of crude oil are improved, oil-gas-water to-be-mixed phase fluid is formed, elasticity energy is supplemented to the formation, overall mobility of fluid in the oil reservoir is improved, mobility of crude oil is improved, and single-well productivity and final recovery are increased.

The invention relates to a combination device for controlling a profile and blocking water for a thickened oil horizontal well of screen pipe well completion. The combination device comprises a perforation device, a chemical plugging pipe column and a mechanical plugging pipe column which are arranged at a preset position in a horizontal well of the screen pipe well completion sequentially and alternatively. The chemical plugging pipe column is formed by a first plug, a first packer, an explosive relief valve and a second packer sequentially, an oil pipe with certain length is connected between the two packers, and the explosive relief valve is connected with the inside the oil pipe between the two packers. The mechanical plugging pipe column is formed by a second plug, a production screen pipe, a cutting uniflow valve, a third packer and a fourth packer sequentially, and an oil pipe with certain length is also connected between the third packer and the fourth packer. By means of a combination method of chemical plugging outside a horizontal slotted screen and mechanical plugging inside the horizontal slotted screen, validity of water blocking is prolonged, a water blocking effect of the screen pipe well completion is improved, oil producing capacity of an water-emerging thickened oil horizontal well is recovered, and a problem of water emerging of the thickened oil horizontal well of the existing screen pipe well completion is solved.

The invention discloses an automatic-and-manual combined type water retaining device and a water retaining method thereof. The water retaining device comprises a base and an automatic water fender rotatably arranged on the base, and is characterized in that the water retaining device further comprises one or more manual water fenders used for being detachably mounted on the upper portion of the automatic water fender, and the bottoms of the manual water fenders used for being connected with the automatic water fender can be attached to the free end of the automatic water fender. The method includes the first step of triggering the automatic water fender for giving out an alarm, the second step of preparing installation of the manual water fenders, the third step of installing the manual water fenders, the fourth step of dismounting the manual water fenders and the fifth step of resetting the manual water fenders. The automatic-and-manual combined type water retaining device and the water retaining method thereof have the beneficial effects that the automatic water fender and the manual water fenders are combined, on the one hand, people have enough time to rush to the water retaining device, and on the other hand, the number of the manual water fenders is determined according to the rainfall, so that the effect that rainwater cannot enter underground buildings is guaranteed to the maximum extent, and the automatic water fender can be effectively detected at ordinary times.

The invention discloses a box type water retaining dam for a coal mine underground reservoir. The box type water retaining dam is located between coal pillar dam bodies on the left side and the rightside of a roadway and used for isolating the underground reservoir and the roadway and blocking a water source in the underground reservoir. The box type water retaining dam comprises a main dam bodyand water retaining wings, wherein the main dam body is of a box type structure, the left side and the right side of the main dam body are embedded in the coal pillar dam bodies on the two sides, thetop of the main dam body is embedded in roadway roof surrounding rock, and the bottom of the main dam body is embedded in roadway bottom plate surrounding rock; and the water retaining wings compriseside wings, the side wings are connected with the left side and the right side of the main dam body and arranged along at least the whole height range of the main dam body, the side wings are embeddedinto the coal pillar dam bodies on the two sides to a certain depth, and thus side wing seepage prevention areas are formed. The box type water retaining dam can reduce crippling and water seepage caused by excessive local stress of the surrounding rock at the same time, adjusts differential settlement, prevents the surrounding rock from being softened due to water entering, and ensures the stability and safety of the dam bodies.

The invention provides a method of implementing grouting and water plugging of a shaft through chemical grout. The method mainly includes the following steps: (1) installing a hole opening pipe, a high-pressure ball valve, a grouting pipeline, a grouting pump and other equipment at a grouting hole; (2) opening the high-pressure ball valve, and ejecting cement grout from the grouting hole through the grouting pump; (3) connecting a mixer with the grouting pump, respectively ejecting urea resin and an oxalic acid solution in the mixer through two pipelines, mixing the urea resin and the oxalic acid solution in the mixer, and ejecting the mixed grout in the grouting hole through the grouting pump; and (4) closing the high-pressure ball valve, stilling for 10-24h so that the grout in the grouting hole is solidified, then detaching the high-pressure ball valve, and grouting in another hole. The method is good in water plugging effect, can achieve effective plugging of water guide micro cracks, and is simple to operate and low in cost.

The invention provides a sound wave method testing method for a tunnel surrounding rock loosening circle. The method comprises the following steps: drilling a test drill hole in tunnel surrounding rock, arranging the grouting type bags on the upper inner wall and the lower inner wall of the drilled hole, placing the hole sealing pipe in the drilled hole, forming a grout overflowing opening and a grout outlet in the outer wall of the hole sealing pipe, enabling a testing instrument to penetrate through the hole sealing pipe, injecting grout into the grouting type bags through the grout outlet,and after grout in the grouting type bags reaches specific strength, injecting the slurry through the grout overflowing opening, injecting water into the hole sealing pipe, after the whole drilled hole is filled with the water, using the water as a coupling agent, using a testing instrument to emit sound waves to tunnel surrounding rock of the tunnel surrounding rock, and determining the range ofthe tunnel surrounding rock loosening circle according to the change condition of the reflection wave velocity of the tunnel surrounding rock. Aiming at complex geology, high ground stress areas and loose and broken surrounding rocks, the invention provides the method for testing the loose circle of the tunnel surrounding rocks by the acoustic wave method, the water plugging effect is improved through the hole sealing pipe, and the hole protection section ensures the drilling stability.

A grouting, water-stopping and water-blocking integrated device, including an anchor rod, the anchor rod is provided with a central hole passing through both ends, the pipe wall of the anchor rod is provided with side holes, and the outer circumference of the anchor rod is provided with a destructible protective shell, A pouch made of elastic material is arranged inside the protective shell, and the pouch cavity of the pouch communicates with the central hole of the anchor rod through the side hole. The all-in-one device for grouting, water-stopping and water-blocking of the present invention is provided with a capsule bag, if encountering the situation that the anchor bit drills into the groundwater layer, inject cement into the central hole immediately, the cement flows into the capsule cavity of the capsule bag from the side hole, and the capsule When the bag expands, the protective shell will be broken, and the expanded bag will block the drill hole, which can quickly block the water and improve the water blocking effect. Since the cement will not flow out of the bag, a large amount of cement can be saved.

The invention discloses a water resistant high-voltage cable and a production method thereof. The cable comprises a cable core and a cable core sleeve wrapped on the cable core. The cable core comprises a plurality of conductors. Fragile water resistant belts are wound on the conductors. Each fragile water resistant belt comprises semi-conducting fragile non-woven fabric and water resistant powder. The water resistant powder is wrapped in the semi-conducting fragile non-woven fabric. When the cable core is stressed, the semi-conducting fragile non-woven fabric is smashed, the water resistant powder fills gaps among the conductors. The production method of the water resistant high-voltage cable includes the steps of producing the cable core and the cable core sleeve. When the cable core is produced, the fragile water resistant belts are wound on the conductors, each fragile water resistant belt comprises the semi-conducting fragile non-woven fabric and the water resistant powder, and the water resistant powder is wrapped in the semi-conducting fragile non-woven fabric. The cable core of the water resistant high-voltage cable adopts the fragile water resistant belts, and the water resistant powder is wrapped in the semi-conducting fragile non-woven fabric and can be filled in the gaps among the conductors of the cable core so that the water resistant high-voltage cable achieves good powder adhesion effect and has optimal water resistant effect.

The invention provides temporary plugging water, which is characterized by being prepared from, by mass, 65%-90% of oil-soluble resin, 2%-5% of industrial gelatin, 3%-25% of plasticizer, 2%-4% of softening point regulator, 0.5%-1.0% of cross-linking agent and 0.3% of dispersing agent. According to the invention, the selective temporary plugging water raw material for the oil-gas well does not contain inorganic solid-phase particles, so that damage to a stratum after temporary plugging water is dissolved is reduced; and the selective temporary plugging water for the oil-gas well is simple and safe in synthesis process, has high-temperature-resistant and salt-resistant capacity, can bear large construction pressure and has a good water plugging effect.

The invention relates to a water plugging method of establishing a large-area chemical partition plate in a gas-water interface of a water-bearing gas reservoir. The method comprises the following steps that (1) an aqueous-phase solution is injected into a gas-water interface of a gas reservoir and is transported to a water layer under the effect of diffusion and dispersion; (2) an oil-phase solution is injected into the gas-water interface of the gas reservoir and is spread in the gas-water interface to replace the gas-water interface with an oil-water interface; (3) an aqueous-phase monomeris diffused towards the oil layer, and a region, close to an oil phase, of the oil-water interface generates polymerization reaction with an oil-phase monomer to form a microporous polymer interlayer;and (4) formation water permeates into the polymer interlayer under the effect of a pressure difference, and mineral ions and impurities continuously deposit to form scales on the polymer interlayerto form a water-impermeable polymer interlayer. The method is reliable in principle and simple and convenient to operate, can effectively solve the problems of small plugging range, low plugging strength and the like of a common water plugging system in the process of water invasion treatment of the edge-bottom water-bearing gas reservoir and has a great practical significance of efficient miningthe edge-bottom water-bearing gas reservoir.

The invention belongs to a water plugging method and device for water gushing in a gap of a steel sheet pile cofferdam. The device is composed of steel sheet piles, and the water plugging device for water gushing of the gap of the steel sheet pile cofferdam comprises a gap inflation water plugging structure or an inflation extrusion inner water plugging structure. The gap inflation water plugging structure is composed of a groove and an inflation bag, the groove is longitudinally formed in the lock catch position of the steel sheet pile, and the inflation bag is arranged in the groove; or the gap inflation water plugging structure is composed of an expansion bag and an inflatable bag with a protective layer. The air inflation extrusion inner water plugging structure is composed of a U-shaped steel plate, an extrusion plate, a water stop belt, a screw rod, an inner threaded hole and a handle. According to the method, only one inflation bag needs to be arranged at the lock catch position of every two adjacent steel sheet piles, if water leaks from the lock catch positions of the steel sheet piles, gas or liquid is injected into the inflation bags located at the water leakage lock catch positions through gas injection ports to enable the inflation bags to expand to block water leakage gaps at the lock catch positions, and water leakage blocking is achieved. The device is novel and simple in structure and design, good in using effect, low in water plugging cost and fast in water stopping.