44results about How to "Good flow control" patented technology

The invention belongs to the field of oilfield chemistry, and particularly relates to a zirconium dispersoid gel complex oil displacing system. The zirconium dispersoid gel complex oil displacing system includes a multi-scale zirconium dispersoid gel, a polyether type nonionic surfactant and preparation water, wherein the mass fraction of the multi-scale zirconium dispersoid gel is 0.16%-0.24% of the total mass of the complex oil displacing system; the polyether type nonionic surfactant is 0.1%-0.4% of the total mass of the complex oil displacing system; the balance is water, and the total mass fraction of all components is 100%. According to the invention, the multi-scale zirconium dispersoid gel and the polyether type nonionic surfactant have excellent synergistic effect, and the oil-water interfacial tension can be reduced to the order of magnitudes of 10<-3> mN / m, so that the displacement efficiency of an oil-displacing agent is remarkably improved, adverse effect caused by weakened viscosity of polymers in a binary combination flooding or a ternary combination flooding is avoided, and adverse effect caused by alkali is avoided, and the oil displacing effect of the complex oil displacing system is improved.

An aseptic diaphragm valve in which a valve seat (37) is formed by a groove including a concave surface of engagement that positioned along an outer diameter of an upper end of an inlet tube (32), and a resilient valve member portion (41) that is annular in extent with a convex surface that moves into the groove to contact the concave surface (37) around the outer diameter of the inlet tube (32) to close the valve. The valve member portion (41) has at least a coating of polytetrafluoroethylene (47) or equivalent material.

A coke oven piping system (10) comprises a pipe assembly for conveying coke oven gases (14) from a coke oven to a collecting main (16); and flow control means comprising a flow orifice (22) in the pipe assembly with an associated obturating member (20), the obturating member being axially moveable between an open position at a certain distance from the flow orifice to a closed position in which it substantially obstructs the flow orifice (22). At least one throttling opening (28) is arranged so as to offer, towards the end of the closing stroke of the obturating member (20), an opening area for the gases to the collecting main (16) that depends on the axial position of the obturating member (20).

The invention relates to a plugging agent for postponing colloid foam and a method thereof for oilfield high-water-content aquifer profile modification water plugging. The plugging agent is composed of a foaming agent system solution and gas, wherein the foaming agent system solution is formed by uniformly dispersing 0.05-0.30% of foaming agent, 0.4-0.6% of water-drum aqueous emulsion polymer and 0.2-0.4% of multiplex emulsion crosslinking agent; and the volume ratio of the foaming agent system solution to the gas under reservoir pressure is 1:(1-3). The plugging agent for postponing colloid foam is used for oilfield high-water-content aquifer profile modification water plugging, and can enhance the oil recovery rate. The invention also provides a method for oilfield high-water-content aquifer profile modification water plugging. The plugging agent has the advantages of high dissolution rate, easy preparation, low initial viscosity and the like, can satisfy on-line injection, enhances the site operability, and saves the construction time and input cost.

The invention relates to a microemulsion system and a preparation method, in particular to a polyacrylamide microsphere system, a preparation method and application thereof. The microsphere system is prepared by emulsion polymerization under the action of a composite initiator; the emulsion system includes the following components in terms of mass fraction: 10%~60% monomer; 0.1%~3% Organic salt; 3%~20% emulsifier; 0.01%~2% co-emulsifier; 0.01%~1% crosslinking agent; 0.001%~0.5% initiator; 0.001%~1% polymerization aid ; 10%~70% deionized water; 10%~50% non-polar solvent. As an interface strengthening agent for emulsion flooding, the polymer microsphere system can effectively increase the expansion modulus and shear modulus of the emulsion interface, and improve the stability of the emulsion. Very good mobility control effect, improve the control and displacement ability of emulsion flooding.

The invention provides a load sensitive forklift multi-way valve, and belongs to the technical field of engineering machinery hydraulic components. The load sensitive forklift multi-way valve comprises an oil inlet valve piece, a lifting valve piece, an inclined valve piece, a fitting valve piece and an oil return valve piece. All the valve pieces are provided with flow control valve rods and oil inlet one-way valves respectively, the inclined valve piece is provided with a load maintaining valve, and the oil return valve piece is provided with an unloading valve core, a reset spring, a shuttle valve and a secondary overflow valve. The load sensitive forklift multi-way valve has good flow control performance, so that the speed of an executing mechanism is unrelated to the load pressure and is only associated with the stroke of the valve rods, and the pressure of a system is unrelated to flow change of oil feeding. Meanwhile, the inclined valve piece is provided with the load maintaining valve, so that the forwards leaning pressure keeps stable all the time, load on an oil cylinder is lowered, when the system flow is larger than the required flow, oil return is conducted on the redundant flow through the unloading valve core, energy consumption can be effectively reduced, and the load sensitive forklift multi-way valve is high in efficiency and less in power loss, so that fuel is saved and a hydraulic system is lower in heating quantity.

The invention belongs to the technical field of aerodynamics, and discloses an active vortex generator based on electromagnetic excitation. The active vortex generator based on electromagnetic excitation comprises a vibrating reed, a frame structure, a permanent magnet and an electromagnetic exciter, wherein the vibrating reed, the frame structure, the permanent magnet and the electromagnetic exciter are sequentially arranged in a wing of an aircraft or a leading-edge cavity of the aircraft from top to bottom. When the active vortex generator is arranged in the wing of the aircraft, a groove structure which is matched with the vibrating reed in cross-section shape is arranged on the skin of the aircraft, the vibrating reed is embedded into the groove structure, and when the vibrating reed is buried inside the skin of the aircraft, the upper surface of the vibrating reed and the horizontal plane of the skin of the aircraft are kept consistent. According to the active vortex generator based on electromagnetic excitation, active adjustment of flow control is achieved, the parasitic drag and adverse influence of the active vortex generator under the off-design working conditions are reduced, and the purposes of optimal drag reduction and optimal noise reduction are achieved.