38results about How to "Reduce downside resistance" patented technology

The invention relates to the technical field of oil and gas exploitation, and discloses a fluid separating device, a shaft structure and a method for producing petroleum or natural gas. The fluid separating device comprises a barrel, a plurality of separators, a first elastic component, a first guide device and a second guide device. The separators are arranged around the barrel; the first elastic component is arranged between the separators and the barrel, and elastic force can be outwardly applied to the separators by the first elastic component along the radial direction of the barrel; the first guide device axially penetrates the barrel and is structured in such a manner that the first guide device can move back and forth between an expansion location and a contraction location along the axial direction of the barrel; the second guide device penetrates the barrel, one end of the second guide device is connected with the separators, and the other end of the second guide device is slidably matched with the first guide device by a matched surface. The fluid separating device, the shaft structure and the method have the advantages that frictional force between the separators and the inner wall of a shaft be eliminated when the fluid separating device descends, and the fluid separating device further can quickly descend to return shaft bottoms.

The invention discloses an automatic plate jointing machine with the material pressing function, and belongs to the technical field of wood machining machines. The machine comprises a rack, an upper heating mechanism, a lower heating mechanism, a plate material pressing mechanism, a material turning mechanism and a material pushing mechanism and is characterized in that the material pushing mechanism comprises a pair of material pushing plate acting cylinders, a material pushing plate and a pair of material pushing plate synchronous devices; the upper heating mechanism comprises a set of upper heating pipes, an upper heating pipe heating medium leading-in main pipe and an upper heating pipe heating medium leading-out main pipe; the lower heating mechanism comprises a set of lower heating pipes, a lower heating pipe heating medium leading-in main pipe and a lower heating pipe heating medium leading-out main pipe; a plate material walking and moving channel is formed between the upper heating pipes and the lower heating pipes; the plate material pressing mechanism comprises a bearing beam, a pair of pressing acting cylinder fixing frames, a pair of grid plate strip backing beams, a set of grid plate strips, a plate material pressing strip and a pair of plate material pressing strip acting cylinders; the cross sections of the grid plate strips are in V shapes; the whole motion effect is good, resistance of the material pushing plate is reduced, the jointed combination effect is high, and the descending resistance of plate materials is reduced.

The invention provides an underground floater cleaning grass fisher. The grass fisher comprises a disc, a tray, a grass fisher rod, a first inner tube, a tray tightening wire and multiple mechanical grabbers, each mechanical grabber comprises a detecting leg, a detecting leg cross arm and a detecting tongue, one end of each detecting leg cross arm is caught on the tray and faces the center of thetray, the other end of each detecting leg cross arm is fixed to the upper end of the corresponding detecting leg and hinged to the edge of the disc together with the detecting leg, the included angleof each detection leg cross arm and the corresponding detecting leg is smaller than 90 degrees, each detecting tongue is installed at the lower end of the corresponding detecting leg through a rotating shaft, the free end of each detecting tongue faces the axis of the disc and can rotate around the rotating shaft to reach the horizontal position to the lowest. The grass fisher is low in cost, lowin weight, easy to operate and convenient to use, and has a good application prospect.

The invention discloses an oil extraction method of weight adding under a pump and an oil well pump with weight adding under the pump, used in pumping units and oil pumped wells in the petroleum industry. In the oil extraction method of weight adding under the pump, a weight adding bar is connected under an oil well pump plunger assembly to reduce the bend and the deformation of a pumping rod string. The oil well pump with weight adding under the pump comprises a pump cylinder assembly, the plunger assembly and an auxiliary mechanism under the pump. The plunger assembly is provided with a liquid outlet valve and a liquid inlet pump, an upper plunger and a lower plunger are connected with a connection bar through a plunger lower joint to connect the weight adding bar under the plunger assembly. The method uses the liquid inlet valve with an offset structure outside the pump while adding weight under the pump, thereby lightening the eccentric wear of pipes and bars and reducing the stroke loss. Due to the weight adding bar arranged under the pump, the pumping rod is kept in the straightening state all the time under the action of gravity, thereby lightening the mutual abrasion of the pipes and the bars. The weight adding under the pump can reduce the elastic bending and deformation of the pumping bar string, thereby reducing the stroke loss and enhancing the filling factor of the oil well pump.

The invention provides a spiral screwing type sampler. The spiral screwing type sampler comprises an upper sampling rod and a lower spiral lifer; the spiral lifer comprises a spiral central spindle and a spiral blade wound outside the spiral central spindle; and the upper surface of the spiral blade for loading sampled materials extends in a shape of sunken circular arc surface along the radial direction of the spiral lifter. Compared with the prior art, the spiral screwing type sampler and the sampling device have the advantages of greatly reducing failure rate, along with simple structure, low downgoing resistance, high sampling speed, high reliability, convenience in equipment maintenance, and high working efficiency and the like.