42results about How to "Avoid pressure leakage" patented technology

The invention discloses an automatic cover pressing machine of plastic covers. The automatic cover pressing machine of the plastic covers is characterized by comprising a pressing mechanism used for tightly pressing the plastic covers on cans and a conveying mechanism used for conveying the plastic covers to the entry of the pressing mechanism. The pressing mechanism can automatically adjust the degree of tightness of cover pressing through a tightness self-adjusting spring mechanism according to the bending and the deformation of the plastic covers, the phenomenon of pressure leakage is effectively avoided, and continuous production can be carried out on the cans with various heights. The conveying mechanism places the plastic covers in a sliding channel one by one through a vacuum suction cup to carry out automatic gravity conveying, the whole conveying mechanism can work continuously and stably, the requirements for the flatness of the plastic covers is not high, and the situation that conveying is stopped due to slight distortion of the plastic covers is avoided.

The invention discloses a method of balancing pressure for well cementation. The method comprises the following steps: a), adopting a cement slurry system of conventional density on a cementing isolation section; b), reducing pressure of a liquid pillar at the upper part of an annulus; and c), controlling wellhead back pressure of the annulus to ensure that the pressure in a weak layer is kept balanced. According to the well cementation process technology provided by the invention, a stratum can be effectively prevented from being pressed to leak, so as to soundly protect an oil-gas production layer; the strength of a cement sheath is guaranteed; the risk of environment pollution is low; the range of a stratum is wide; and the method is suitable for a reservoir stratum which is easy to leak and low in pressure.

The invention discloses a method for prewashing multi-density double-setting long-sealing gas channeling prevention well cementing, which comprises the following steps of: (1) injecting cement paste prepared from G-stage cement at 0-60m of a surface layer; (2) injecting cement paste prepared from the G-stage cement, a DSK water-locking channeling prevention agent and water at 60-136m of the surface layer; (3) injecting cement paste prepared from the G-stage cement, glass beads, micro-silica, a DSJ filtrate reducer, the DSK water-locking channeling prevention agent and water at 0-390m, at 401mor 420m of an oil layer; and (4) injecting cement paste prepared from the G-stage cement, 1.0 percent of DSJ filtrate reducer, 5.0 percent of DSK water-locking channeling prevention agent and water at 390m, 401m or 420-900m, 1,020m or 1200m of the oil layer. The method has good blocking effect and obvious effect of preventing gas channeling in a shallow gas region, and obviously improves the wellcementing quality.

The invention provides an elastic mesh type straw compression pair roller and belongs to the technical field of straw compression machines. The pair roller comprises a first compression roller assembly and a second compression roller assembly which are identical in structure and opposite in direction. Each compression roller assembly is composed of a left end cover assembly, a compression roller shaft assembly, a roller cylinder assembly, an elastic piece assembly, a rubber strip assembly and a right end cover assembly. The connection modes of the parts of the two compression roller assembliesare the same, but the elastic pieces are differently arranged. The elastic piece of the first compression roller is arranged in a left-handed mode, the elastic piece of the second compression rolleris arranged in a right-handed mode, and the elastic pieces are spirally meshed and installed to achieve elastic mesh type compression of straw. By means of the pair roller, forced pushing and feedingfor straw compression can be realized; meanwhile, the straw with different shape characteristics is subjected to elastic compression, the problems that in the straw compression process, the straw slides, is difficult to feed into the machine, is subjected to missing compression or is not compacted are solved, continuous high-strength compression can be realized, and the straw compression effect and efficiency are improved.

The invention discloses a fluid loss agent and a preparation method thereof, and belongs to the technical field of oil field well cementation. The fluid loss agent provided by the embodiment of the invention comprises the following components in parts by weight: 100 parts of 2-acrylamide-2-methyl propanesulfonic acid, 0.1-0.5 part of a chain monomer, 1-3 parts of a lubricant, 1-3 parts of a surfactant, 3-5 parts of a cyclic monomer, 8-10 parts of an amide monomer, 1-3 parts of a carboxylic acid monomer and 300-400 parts of water. The fluid loss agent provided by the embodiment of the inventionis suitable for salt paste layer well cementation operation, and salt-containing high-density cement paste prepared from the fluid loss agent has excellent stability and rheological property under the condition of low liquid-solid ratio, is rapid in strength development and high in strength under the condition of large temperature difference, and can effectively reduce the flowing resistance of the salt-containing high-density cement paste under the condition of salt paste layer narrow safe density window well cementation, so that the well cementation construction safety is effectively guaranteed, and the well cementation quality is improved.

The invention relates to light-bead leakage-proof cement paste for well cementation and a manufacturing technology; the light-bead leakage-proof cement paste is characterized in that the light-bead leakage-proof cement paste is compounded by G-grade oil-well cement and light beads according to a weigh proportion, wherein the G-grade oil-well cement accounts for 60-90 parts, the light beads accounts for 10-40 pats and water accounts for 65-95 parts. The light-bead leakage-proof cement paste aims at overcoming the defects of the prior art. The volume of the light-bead leakage-proof cement paste system provided by the invention obviously changes along with the change of pressure so that the system density of the cement paste can be effectively reduced, and the cementation quality of cement stones can also be increased; when leakage happens, the light-bead leakage-proof cement paste has the effects of leakage slowdown and leaking stoppage.

The invention discloses mining downward drilling, water draining, slag discharging and extraction integrated equipment which comprises an extraction pipe, and the lower end of the extraction pipe is open; a central pipe is coaxially sleeved with the extraction pipe, a plurality of extraction holes are evenly formed in the bottom of the side wall of the extraction pipe, an extraction cavity is defined between the central pipe and the extraction pipe, an extraction connector and a deslagging connector are arranged at the top of the side wall of the extraction pipe, the extraction connector is connected with a gas extraction pipeline, and the deslagging connector is used for being connected with a deslagging pipe which is led into a roadway drainage ditch; an extraction electromagnetic valveis arranged on the gas extraction pipeline, and a deslagging electromagnetic valve is arranged on the deslagging pipe; and the upper end of the extraction pipe is closed, the upper end of the centralpipe is connected with a water injection pipe through a water injection electromagnetic valve and connected with a gas injection pipe through a gas injection electromagnetic valve. The invention further discloses a corresponding gas extraction method. The mining downward drilling, water draining, slag discharging and extraction integrated equipment is suitable for downward gas extraction holes, coal cinder and accumulated water accumulated in extraction holes can be conveniently discharged, a water seal effect is eliminated, water in the holes is reduced, the air permeability of coal bodies around the extraction pipe is improved, and the gas extraction efficiency is improved.

The invention discloses a construction method for efficient layered backfilling of earthwork, and relates to the technical field of backfilling construction of earthwork. The construction method comprises the following steps: (1) substrate treatment; (2) layered filling: before filling compaction, the loose laying thickness is not greater than 25 cm and not less than 12 cm; (3) paving and leveling: earthwork is transported from an excavation area to a soil filling area; (4) watering and drying in the sun: the water content of a filler measured on site is compared with an optimal water content,and when the water content exceeds +/-2%, the filler is watered or dried in the sun; (5) rolling: in a rolling process, a road roller is used for conducting prepressing once in a mode of first lightpressing and then heavy pressing from a low position to a high position and from a side to the middle, then flattening is carried out by a bulldozer and then rolling is carried out; (6) detecting: thewater content and the compaction degree of the filled soil are detected; and (7) filling construction of an uppermost layer of soil: an accurate virtual height is reserved according to the field soiltexture and the field pressure test condition. The method has the advantages that the overall construction is standard, the rework probability is greatly reduced, and the construction efficiency is high.

The present invention relates to the technical field of packaging equipment, in particular to a carton forming machine capable of deep wrapping, including a box separating mechanism, an edge brushing mechanism and a box wrapping mechanism. The box wrapping mechanism includes a box wrapping die, a driver, a fixing mechanism and The heating device, the fixing mechanism fixes the carton, the driver drives the box die head to move up and down to press the carton in the fixing mechanism, the heating device is used to heat the box die head; the fixing mechanism includes a lifting mechanism, a clamping mechanism and a swing mechanism , the lifting mechanism is used to send the carton to the clamping mechanism for clamping, the swing mechanism is arranged above the clamping mechanism, and is used to bend the edge section of the clamped carton into the carton, the swing mechanism avoids The cartons leak pressure or crush the surface paper during the packing process; the heating device solves the problem that the cartons need to be transferred to another debubbling device for debubbling process in the past, which improves production efficiency and saves costs .

The invention discloses a method for detecting transverse compactness and uniformity of a roadbed. The method comprises the steps that before a roadbed to be compacted is compacted, whether a first linear regression equation K = aF<SE> + b and a second linear regression equation s = cI<n> + d can be obtained or not is judged, wherein in the formulas, K is the transverse compactness, F<SE> is the resultant force of the counter force of a compacted layer, s is a transverse compactness uniformity parameter, and I<n> is a transverse uniformity index; if yes, the first linear regression equation and the second linear regression equation are obtained; acceleration information of a road roller is acquired in the process of compacting the roadbed to be compacted; the resultant force of the counter force of the compacted layer and the transverse uniformity index of the compacted layer are calculated according to a calculation rule and the acceleration information; and the transverse compactness of the roadbed to be compacted is determined according to the resultant force of the counter force of the compacted layer and the first linear regression equation, and the transverse compactness uniformity parameter of the roadbed to be compacted is determined according to the transverse uniformity index of the compacted layer and the second linear regression equation. According to the method, the transverse compactness and uniformity of the roadbed can be detected in real time.

The invention discloses a symmetry welding piston, and relates to the technical field of engines. The piston comprises a protection top layer, a dampproof layer is arranged on the outer surface of thelower end of the protection layer, a piston head is arranged on the outer surface of the lower end of the dampproof layer, a groove is formed in the outer surface of the lower end of the piston head,and a piston pin base is arranged on the outer surface of the lower end of the groove. Through the symmetry welding piston, during use, the piston is more safer, through matching of the adjustable piston head and the movable piston pin base inside, the service life of the piston is prolonged, meanwhile, when the piston works, the piston is safer and stable, the piston head passes through a telescopic buckle and a fixed clamp on the lower end of a piston ring groove, adjusting and fixing are achieved, the work efficiency of the piston is improved, the heat insulation of the piston is reinforced through the isolation layer in the piston pin base at the lower end, the whole service life of the piston is prolonged, the piston is practical, and the better use prospects are brought.

The invention provides a pancake proportion uniformizing device and method for shredded pancake production, the pancake proportion uniformizing device for shredded pancake production comprises a conveying unit and further comprises a bottom oil return unit, and the bottom oil return unit used for oiling the conveying unit is arranged on the side portion of the conveying unit; the top feeding unit used for scattering chopped green onion on the surface of the dough belt, compacting and oiling is arranged at the top of the conveying unit; the oil pressing unit used for uniformly pressing sprayed oil on the upper surface of the dough belt is arranged on the side part of the top feeding unit; the oil pressing unit comprises an outer connecting rod. The chopped green onions are scattered on the dough belt, the chopped green onions are compacted into the dough belt through the pressing plate, then the chopped green onions are adhered by dough, the surfaces of the compacted chopped green onions are sprayed with oil and pressed uniformly, the chopped green onions are fixed and protected in the dough belt, and the situation that the chopped green onions are stacked unevenly in the overturning process is reduced.