CN204492782U - Polymer mother liquor online low pressure mixture injection device - Google Patents

Abstract

An online low-pressure mixing and injecting device for polymer mother liquid. In order to overcome the shortcomings of the existing online high-pressure mixing injection device for polymer mother liquor, which cannot meet the needs of a large injection volume due to its small injection volume, the centrifugal pump, Venturi tube, and pipeline pump of the dissolution unit of the utility model are connected sequentially from front to back; The storage hopper and the metering feeder at its lower end are located above the Venturi tube; the pipeline pump communicates with the aging tank of the curing unit through pipelines; the curing tank is connected with the feeding pump of the feeding unit through pipelines, and the static mixer of the injection unit, The polymer injection pump and the flow distributor are connected in sequence through pipelines, and the injection pipeline installed at the back end of the flow distributor is connected to the wellhead; the connection pipeline between the water tank and the centrifugal pump, and the connection pipeline between the feeding pump and the injection pump are connected with water supply pipelines , A water supply pump and a flow regulating valve are installed on the water supply pipeline. The beneficial effect is that the structure is reasonable, the two-way dissolution and aging meet the requirement of a large injection volume of the polymer; the flow rate of water mixing is adjusted and controlled accordingly, and the concentration precision of the prepared solution is high.

Description

On-line low-pressure mixing and injection device for polymer mother liquor

technical field

The utility model relates to a polymer mixing injection device for tertiary oil recovery in an oil field, in particular to an online low-pressure mixing injection device for polymer mother liquid.

Background technique

With the continuous deepening of oilfield exploration and development, after the development of primary oil recovery and secondary oil recovery, old oil fields are facing difficulties such as increasing difficulty in stabilizing production and increasing production, secondary oil recovery effect is getting worse, and increasing recovery is difficult year by year. In view of the above problems, the chemical flooding tertiary oil recovery technology dominated by polymer flooding technology is one of the important technologies for enhancing oil recovery in the later stage of crude oil production.

The tertiary oil recovery technology of chemical flooding is to preliminarily mix dry polymer powder with water to prepare a polymer solution with a target concentration. The polymer solution formed after the dry powder is mixed with water enters the curing box for curing, and becomes the mother liquor of the polymer solution after being fully matured. At present, the surface equipment for polymer chemical flooding for tertiary oil recovery is an online high-pressure mixing injection device for polymer mother liquor, which mainly includes a dissolution unit, a ripening unit, a feeding unit, and an injection unit. Due to the small injection volume, after the polymer mother liquor is prepared, use The polymer injection pump is mixed with water, diluted to a target concentration solution, and then injected into the formation. The process flow is shown in Figure 1. The specific process steps are: the low-pressure water enters the dissolution unit 17 through the water inlet pipe 1, the filter 2, and the water tank 3 in sequence. , then the water is transported to the Venturi tube 21 by the centrifugal pump 4, and the dry polymer powder added to the storage hopper 5 is initially measured with the quantitative water at the Venturi tube 21 after being metered by the metering feeder 6 at the lower end of the storage hopper 5. After mixing, a certain concentration of polymer solution is formed; the polymer solution is transported to the curing unit 16 by the pipeline pump 7, and the polymer solution is transported to the curing tank 8 for stirring and curing, and after being matured in the curing tank to become a polymer mother liquor, it enters the feed through the pipeline Unit 15; the polymer mother liquor is delivered to the injection unit 14 by the feeding pump 9; the polymer mother liquor is boosted by the injection pump and mixed with the high-pressure water provided by the booster pump 22 on the water supply line 20 at the front end of the static mixer 10, and mixed After the solution is fully mixed in the static mixer 10, it enters the wellhead through the flow distributor 12 and the injection pipeline 13. The proportioning of high-pressure water is manually regulated by flowmeter 23.

Using polymer mother liquor online high-pressure mixing injection device for chemical flooding tertiary oil recovery, the injection volume is small, which cannot meet the needs of large injection volume; the ratio of polymer mother liquor and high-pressure water is completed by manually adjusting the flow meter, and the prepared solution has low concentration accuracy , unable to meet the process requirements.

Utility model content

In order to overcome the shortcomings of the existing polymer mother liquid online high-pressure mixing injection device, which has a small injection volume and cannot meet the needs of a large injection volume; the manual adjustment of the flowmeter to complete the solution concentration ratio is low and cannot meet the technical requirements. The utility model provides a The utility model relates to an online low-pressure mixing injection device for polymer mother liquor.

The technical solution adopted by the utility model to solve the technical problem is: the polymer mother liquid online low-pressure mixing injection device includes a dissolving unit, a curing unit, a feeding unit, and an injecting unit. The water inlet pipe, filter, and water tank are connected in sequence by pipelines and installed at the front end of the dissolution unit. The centrifugal pump, Venturi tube, and pipeline pump of the dissolution unit are connected in sequence from front to back; the storage hopper and the metering feeder at its lower end are located in the Above the Venturi tube; the pipeline pump communicates with the aging tank of the curing unit through pipelines; the curing tank is connected with the feeding pump of the feeding unit through pipelines, and the static mixer, polymer injection pump and flow distributor of the injection unit are connected in sequence through pipelines , the injection pipeline installed at the back end of the flow distributor communicates with the wellhead; the connection pipeline between the water tank and the centrifugal pump, the connection pipeline between the feed pump and the polymer injection pump is connected with a water supply pipeline, and a water supply pump and flow adjustment are installed on the water supply pipeline. valve.

The dissolving unit, curing unit and feeding unit are connected in sequence to form a group, and after two or more groups are connected in parallel, the front end communicates with the water tank, and the rear end communicates with the inlet port of the static mixer. The flow regulating valve is a follow-up flow regulating valve.

The beneficial effect of the utility model is that the structure is reasonable, the polymer mother liquor is mixed with water at low pressure, which saves the equipment cost, reduces the difficulty of automatic process control, and improves the reliability of the equipment; dual-path dissolution and dual-path aging can meet the requirements of polymer The demand for large injection volume; follow-up adjustment and control of water flow rate, high precision of the concentration of the prepared solution.

Description of drawings

Fig. 1 is a flow chart of the existing polymer mother liquor online high-pressure mixing injection process.

Fig. 2 is a structural schematic diagram of the online low-pressure mixing injection device for polymer mother liquor of the present invention.

In the figure: 1. Water inlet pipe, 2. Filter, 3. Water tank, 4. Centrifugal pump, 5. Storage hopper, 6. Metering feeder, 7. Pipeline pump, 8. Ripening tank, 9. Feeding pump , 10. Static mixer, 11. Polymer injection pump, 12. Flow distributor, 13. Injection pipeline, 14. Injection unit, 15. Feeding unit, 16. Curing unit, 17. Dissolving unit, 18. Flow regulating valve , 19. Water supply pump, 20. Water supply pipeline, 21. Venturi tube.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described. However, those skilled in the art should know that the present invention is not limited to the specific embodiments listed, as long as it conforms to the spirit of the present invention, it should be included in the protection scope of the present invention.

See attached drawing 2. The online low-pressure mixing injection device for polymer mother liquor of the utility model mainly includes a dissolving unit 17, a curing unit 16, a feeding unit 15, and an injection unit 14, and the dissolving unit 17, the curing unit 16, the feeding unit 15, and the injection unit 14 are composed of the former Connect in turn. The water inlet pipe 1, the filter 2, and the water tank 3 are connected in sequence through pipelines and installed at the front end of the dissolving unit 17. The centrifugal pump 4, Venturi tube 21, and pipeline pump 7 of the dissolving unit 17 are connected sequentially from front to back; the storage hopper 5 and the metering feeder 6 at its lower end are located above the Venturi tube 21, and the polymer dry powder is added to the storage hopper 5, enter the Venturi tube 21 after the metering feeder 6 at the lower end of the storage hopper 5 . The pipeline pump 7 communicates with the aging tank 8 of the aging unit 16 through pipelines; the aging tank 8 is connected with the feeding pump 9 of the feeding unit 15 through pipelines. The static mixer 10, polymer injection pump 11, and flow distributor 12 of the injection unit 14 are sequentially connected through pipelines, and the injection pipeline 13 installed at the rear end of the flow distributor 12 communicates with the wellhead.

A water supply pipeline 20 is connected between the connection pipeline between the water tank 3 and the centrifugal pump 4 , and the connection pipeline between the feed pump 9 and the polymer injection pump 11 , and a water supply pump 19 and a flow regulating valve 18 are installed on the water supply pipeline 20 . Wherein the flow regulating valve 18 is a follow-up flow adjustment, which realizes the follow-up adjustment control of the water mixing flow and improves the concentration accuracy of the prepared solution.

In the utility model, the dissolving unit 17, the curing unit 16, and the feeding unit 15 are connected in sequence to form a group. After two or more groups are connected in parallel, the front end communicates with the water tank 3, and the rear end communicates with the inlet port of the static mixer 10. . The two-way/multi-way dissolution and aging system thus constituted can meet the demand for large injection volume.

The specific process of applying the polymer mother liquid online low-pressure mixing injection device of the utility model is as follows:

First, the low-pressure incoming water enters the water tank 3 through the water inlet pipe 1 and the filter 2, and the centrifugal pump 4 transports the water to the Venturi tube 21; After the feeder 6 is metered, it is initially mixed with quantitative water at the Venturi tube 21 to form a certain concentration of polymer mother liquor;

Then the polymer mother liquor is transported to the aging tank 8 by the pipeline pump 7 for stirring and aging;

Then, the matured polymer mother liquor in the aging tank 8 is delivered to the static mixer 10 by the feed pump 9; here, the matured polymer mother liquor is mixed with the low-pressure water in the water supply line 20 to form a target concentration solution;

Finally, the target concentration solution is pumped up by the polymer injection pump 11 and then metered and injected into each wellhead by the flow distributor 12 according to the demand of the polymer injection well.

Among them, the low-pressure water at the static mixer 10 is the water in the water tank 3, which is delivered by the water supply pump 19, and the ratio of the polymer mother liquor and water is adjusted by the flow regulating valve 18.

The utility model adopts two-way/multi-way dissolution and two-way/multi-way curing technology, which can meet the demand of large injection volume; adopts low-pressure water mixing, saves high-pressure water injection pumps and matching valve group pipelines, and reduces equipment investment; The proportion of mother liquor mixed with water adopts the follow-up flow control technology, and the proportioning accuracy is high.

It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the patent claims.

Claims (3)

1. a polymer mother liquor online low pressure mixture injection device, comprise and dissolve unit, slaking unit, feeding unit, injection unit, water inlet pipe, strainer, water pot are arranged on the front end of dissolving unit after being connected successively by pipeline, the centrifugal pump of dissolving unit, Venturi tube, tubing pump connect from front to back successively; The metering feeder of storage bin hopper and lower end thereof is positioned at the top of Venturi tube; Tubing pump is communicated with the slaking tank of slaking unit by pipeline; Slaking tank is connected by the feeding pump of pipeline with feeding unit, it is characterized in that:

The static mixer (10) of described injection unit (14), polymer-injecting pump (11), assignment of traffic instrument (12) are connected successively by pipeline, and the injection pipeline (13) being arranged on assignment of traffic instrument (12) rear end is communicated with well head;

The connecting line of described water pot (3) and centrifugal pump (4), feed pump (9) and polymer-injecting pump (11) connecting line between be connected with water supply line (20), water supply line (20) is provided with supply-water pump (19), flow control valve (18).

2. polymer mother liquor online low pressure mixture injection device according to claim 1, it is characterized in that: described dissolving unit (17), slaking unit (16), feeding unit (15) are one group after connecting successively, front end after two groups or more parallel connection is communicated with water pot (3), and rear end is communicated with the arrival end of static mixer (10).

3. polymer mother liquor online low pressure mixture injection device according to claim 1, is characterized in that: described flow control valve (18) is that follow-up flow regulates.