CN204324401U - A kind of hermetic type polymer dry powder hydraulic conveyor - Google Patents

Abstract

The utility model provides a closed polymer dry powder hydraulic conveying device. The device includes a screw feeder, a hopper and a Venturi injection port. The injection port is connected, the connection between the screw lower hopper and the receiving hopper is a closed connection, the receiving hopper is a closed receiving hopper, and an air charging port for filling gas to displace air is opened on the closed receiving hopper. The device has an air charging port on the closed hopper. Since the hopper is airtight during use, when nitrogen is filled into the hopper, since the density of nitrogen is lower than that of oxygen, the oxygen in the hopper can be released from the air. It is discharged from the outlet of the lower end of the closed feeding port, and then when the dry powder feeding device is discharging, the closed hopper is filled with nitrogen, and the oxygen content in it is greatly reduced, which ensures that the polymer solution further formed after the dry powder and water are mixed low oxygen content.

Description

A closed polymer dry powder hydraulic conveying device

technical field

The utility model relates to a closed polymer dry powder hydraulic conveying device.

Background technique

At present, researches on chemical flooding technologies such as polymer flooding, polymer weak gel control flooding, polymer+surfactant and alkali+polymer+surfactant combined flooding have been carried out at home and abroad to improve the ultimate recovery of oilfields. However, the research and application of chemical flooding technology for high-temperature reservoirs above 80 °C has not yet broken through. Among them, the key issue in the preparation of the polymer solution in the injected flooding agent system is to prevent the chemical degradation of the polymer and reduce the viscosity during the preparation process, because the chemical degradation of the polymer refers to certain chemical factors (heat, oxygen, residual impurities, Under the action of excessive metals), the redox reaction or hydrolysis reaction that occurs will break the molecular chain or change the structure of the polymer, resulting in a decrease in the molecular weight of the polymer, a decrease in viscosity, and in severe cases, it will even completely lose viscosity. Therefore, the polymer The chemical degradation of the polymer solution is a problem that must be paid attention to during the preparation of the polymer solution.

In the polymer flooding industrial application projects carried out by domestic oilfields to enhance oil recovery, polymer dry powder and water mixing conveying devices are mixed and conveyed under open normal pressure conditions. Such conveying devices often bring in a large amount of air. , which will inevitably lead to an increase in the dissolved oxygen content of the prepared polymer mother liquor. The Chinese patent with the announcement number of 200820089775.0 discloses a wind power conveying device for fluid materials. This wind power conveying device is an air powder mixing conveying device under an open normal pressure state. The dissolved oxygen content of the polymer mother liquor prepared by it increases by 1.5 to 1.8 mg/L. The Chinese patents with the notification numbers CN200620021767 and CN 200920100560 disclose two kinds of water-jet type polymer dry powder dispersing and dissolving devices. These two kinds of water-jet type dissolving devices can greatly reduce the injection amount of air, but still cannot meet the requirements of high-temperature reservoir chemistry. Flooding requirements on the oxygen content of the polymer solution.

In order to avoid the thermo-oxidative degradation of the polymer solution and increase the viscosity of high-temperature polymer flooding, low cross-linked polymer flooding, composite flooding and their combination flooding systems prepared at 80-105 °C, it is necessary to develop a closed polymer The dry powder hydraulic conveying device provides technical equipment support for the chemical flooding technology of high-temperature reservoirs that produce reserves above Category III (reservoir temperature above 80°C).

Utility model content

The purpose of this utility model is to provide a kind of polymer dry powder hydraulic conveying device that can reduce the oxygen content of polymer solution in the configuration polymer solution process.

In order to solve the above technical problems, the utility model adopts the following technical scheme: a closed polymer dry powder hydraulic conveying device, including a screw feeder, a hopper and a Venturi injection port, the screw feeder is connected with the hopper, The outlet at the lower end of the hopper is connected to the Venturi injection port, the connection between the screw feeder and the hopper is a closed connection, the hopper is a closed hopper, and the closed hopper There is an air charging port for filling gas to displace air on the top.

The outlet at the lower end of the closed hopper is connected to the tail of the throat section of the Venturi tube.

A heating device is sheathed on the outside of the closed receiving hopper.

The inflation port is arranged tangentially to the closed receiving hopper.

There are two inflation ports, the two inflation ports are arranged symmetrically, and the opening directions of the two inflation ports are opposite.

The closed polymer dry powder hydraulic conveying device of the present utility model has an air charging port on the closed hopper, and since the hopper is airtight during use, when filling nitrogen into the hopper because the density of nitrogen is smaller than that of oxygen, In this way, the oxygen in the hopper can be discharged from the lower outlet of the closed feeding port, and when the dry powder feeding device is discharging, the closed hopper is filled with nitrogen, and the oxygen content in it is greatly reduced, ensuring that the dry powder The polymer solution formed by further mixing with water has a lower oxygen content.

Further, the lower end of the closed hopper is connected to the water supply system through the Venturi tube, the inlet of the Venturi tube is connected to the water supply system, and the outlet of the lower end of the closed hopper is connected to the tail of the throat section of the Venturi tube. When in use, the water supply The system feeds high-pressure water flow into the Venturi tube, and the water flow velocity at the tail of the throat section of the Venturi tube is the largest, so the negative pressure is the largest, so that the high-speed water flow can suck out the dry powder and gas in the closed feeding port. At this time, Nitrogen gas is charged from the gas charging port and is sucked out with the dry powder at the lower end of the feeding port.

Further, the outer circumference of the closed receiving hopper is provided with a heating device, because the negative pressure generated at the tail of the throat section of the Venturi tube has a longer time than the stable operation time during the period when the hydraulic conveying device just starts working and just finishes working. It must be lowered, and the water vapor inside the Venturi tube will enter the hopper through the lower end of the hopper, which will cause the dry powder in the hopper to flocculate and adhere to the inner wall of the hopper, affecting the use of the entire device. The heating of the dry powder in the medium prevents the dry powder from flocculating and adhering.

Description of drawings

Fig. 1 is the structural representation of the embodiment of the closed type polymer dry powder hydraulic conveying device of the present invention;

Fig. 2 is a sectional view of plane A-A in Fig. 1 .

Detailed ways

The embodiment of the closed type polymer dry powder hydraulic conveying device of the present utility model: as shown in Figure 1, comprise the material storage box 1 that is used to store dry powder, the dry powder in the material storage box 1 is delivered to dry powder by screw feeder 2 In the closed hopper 3, wherein, the storage box 1 and the screw feeder 2 are airtightly arranged, the screw feeder 2 and the closed hopper 3 are airtightly connected through an airtight sleeve, and the upper part of the closed hopper 3 It is cylindrical, and the lower part is inverted conical. The outer periphery of the lower part of the closed hopper 3 is provided with an electric heating device 4 for heating the dry powder in the closed hopper 3. The electric heating device is a heating mantle made of resistance wire. The function of the device 4 is to prevent the dry polymer powder from adhering to the inner wall of the hopper after being damp. Of course, in other embodiments, an electric heating device may not be provided; the upper and lower connection positions of the closed hopper 3 are provided with two gas charging ports 5. The two gas charging ports 5 are arranged tangentially to the outer circular surface of the inverted cone, and the two gas charging ports 5 are symmetrical to each other, and the directions of the gas inlets are opposite, so that the gas entering the closed hopper circulates along the inner circumference of the hopper, and the gas enters Evenly, of course, in other embodiments, there can be one air inlet or a plurality of air inlets evenly distributed on the circumference, and the direction of the air inlet can also extend radially. The outlet at the lower end of the closed receiving hopper 3 is connected to the tail part 9 of the throat section of the Venturi tube through the electric ball valve 6, the inlet 8 of the Venturi tube is connected to the water supply system, and the outlet 9 of the Venturi tube is connected to the polymer dissolution and curing system.

When the closed polymer dry powder hydraulic conveying device of the utility model is in use, the closed hopper 3 is first inflated through the air charging port 5, and the gas charged is nitrogen. Since the density of nitrogen is smaller than that of oxygen, this forces oxygen to gather in the air. Below the nitrogen, it is discharged from the lower end outlet of the closed hopper 3, so that the air in the closed hopper 3 is replaced by high-purity nitrogen, which greatly reduces the oxygen content in the hopper. Of course, in other embodiments, The gas charged can also be an inert gas. Then open the electric ball valve 6, open the water supply system and start water supply from the inlet 8 of the Venturi tube. At this time, because the pipe diameter at the end of the throat section of the Venturi tube at 9 is the smallest, when the water flow rate of the Venturi tube is constant, the water The flow rate is the largest, and the degree of vacuum generated is also the largest, so that the jet will generate a great suction force on the lower outlet of the closed hopper, and the dry powder and nitrogen in the closed hopper 3 will be sucked out. At this time, it is best to ensure that the closed hopper The air intake at the air inlet above the hopper is equal to the air output at the outlet at the lower end to stabilize the air pressure inside the closed receiving hopper.

The closed polymer dry powder hydraulic conveying device of the present utility model has an air charging port on the closed hopper, and since the hopper is airtight during use, when filling nitrogen into the hopper because the density of nitrogen is smaller than that of oxygen, In this way, the oxygen in the hopper can be discharged from the lower outlet of the closed feeding port, and when the dry powder feeding device is discharging, the closed hopper is filled with nitrogen, and the oxygen content in it is greatly reduced, ensuring that the dry powder The polymer solution formed by further mixing with water has a lower oxygen content.

Claims (5)

1. A closed polymer dry powder hydraulic conveying device, comprising a screw feeder, a hopper and a Venturi injection port, the screw feeder is connected with the hopper, and the lower end discharge port of the hopper is connected to the Venturi injection port. The injection port connection is characterized in that the connection between the screw feeder and the hopper is a closed connection, the hopper is a closed hopper, and the closed hopper is provided with a gas drive Inflation port for air. 2. The closed polymer dry powder hydraulic conveying device according to claim 1, characterized in that, the lower end outlet of the closed hopper is connected to the tail of the throat section of the Venturi tube. 3. The closed polymer dry powder hydraulic conveying device according to claim 2, characterized in that a heating device is sheathed outside the closed receiving hopper. 4. The closed polymer dry powder hydraulic conveying device according to claim 1, 2 or 3, characterized in that the air charging port is arranged tangentially to the closed hopper. 5. The closed polymer dry powder hydraulic conveying device according to claim 4, characterized in that there are two inflation ports, the two inflation ports are arranged symmetrically, and the opening directions of the two inflation ports are opposite.