CN206594092U - A kind of experimental provision of nitrogen and water two phase flow surface coefficient of heat transfer - Google Patents

Abstract

The utility model belongs to the technical field of crude oil exploitation, and in particular relates to an experimental measuring device for the surface heat transfer coefficient of two-phase flow of nitrogen and water, comprising a ring-connected first valve, a double-layer injection pipe, a second valve, a venturi Mixer, first liquid flow meter, third valve, water pump and water storage tank; water inlet pipe is arranged between the double-layer injection pipe and water pump, and the fourth valve, second liquid flow meter and temperature converter are arranged on the water inlet pipe An outlet pipe is arranged between the double-layer injection pipe and the water storage tank; an inlet pipe is also arranged on the Venturi mixer, and a nitrogen cylinder, a fifth valve and a gas flow meter are arranged on the inlet pipe. The experimental measurement device can simulate the measurement environment under different well inclinations; it can adjust the temperature of the single-phase fluid in the annular space; it can analyze the influence of the flow patterns corresponding to different gas fractions on the surface heat transfer coefficient of the two-phase flow.

Description

An experimental measurement device for the surface heat transfer coefficient of nitrogen and water two-phase flow

technical field

The utility model relates to an experimental measuring device for the surface heat transfer coefficient of nitrogen and water two-phase flow, which belongs to the technical field of crude oil exploitation.

Background technique

After multiple times of water injection to replace oil in oil wells, the oil-water interface moved up, and the oil replacement effect gradually became worse. Many oil wells became high water cut wells after water injection failed to replace oil, and finally had to be shut down. In addition, water injection can only displace the crude oil below the overflow of the underground karst cave of the oil well, but it is difficult to displace the "attic oil" above the overflow, resulting in a large amount of unrecoverable remaining oil in the high parts around the well.

In order to effectively utilize the remaining oil at the high parts around the well, improve the oil recovery rate, and restore the production capacity of high water-cut oil wells, many scholars have proposed a method of gas-water mixed injection to replenish energy for the formation, and use the difference in gravity to achieve enhanced oil displacement. The purpose of efficiency is to improve the availability of formation crude oil reserves. Nitrogen and water mixed injection is the most commonly used important means to enhance oil recovery in oilfields. However, due to the complexity of gas-water mixing and flow patterns, it is difficult to calculate the wellbore temperature during gas-water mixed injection, especially the heat transfer of gas-water mixed flow.

Utility model content

The utility model provides an experimental measuring device for the surface heat transfer coefficient of nitrogen and water two-phase flow, the purpose of which is to solve the problem of difficult calculation of heat transfer in the prior art.

The technical scheme of the utility model is as follows:

The utility model provides an experimental measurement device for the surface heat transfer coefficient of nitrogen and water two-phase flow, which comprises a first valve, a double-layer injection pipe, a second valve, a Venturi mixer, a first liquid flow meter, The third valve, the water pump and the water storage tank, and the water storage tank is connected with the first valve to form a closed loop.

In the embodiment provided by the utility model, the above-mentioned experimental measurement device for the surface heat transfer coefficient also includes a water inlet pipe and a water outlet pipe;

One end of the water inlet pipe is connected to the double-layer injection pipe, and the other end is connected to the water pump, and a fourth valve, a second liquid flow meter and a temperature converter are arranged in sequence along the water flow direction at the end close to the water pump;

One end of the water outlet pipe is connected with the double-layer injection pipe, and the other end is connected with the water storage tank.

In the embodiment provided by the present invention, the above-mentioned experimental measurement device for surface heat transfer coefficient also includes an air inlet pipe and a nitrogen cylinder, one end of the air inlet pipeline is connected to the Venturi mixer, and the other end is connected to the nitrogen cylinder.

In the embodiment provided by the utility model, a fifth valve and a gas flow meter are sequentially arranged between the nitrogen cylinder and the Venturi mixer in the experimental measurement device for the surface heat transfer coefficient along the gas flow direction.

In the embodiment provided by the utility model, the above-mentioned double-layer injection pipe includes an inner pipe and an outer pipe, and an annular space is formed between the inner pipe and the outer pipe;

The outer tube is provided with a first temperature sensor and a second temperature sensor;

The inner tube is provided with a liquid inlet, a liquid outlet, a third temperature sensor and a fourth temperature sensor, the liquid outlet is connected to the first valve, and a fourth temperature sensor is arranged at the liquid outlet, the liquid inlet and the second The valves are connected, and a third temperature sensor is provided at the liquid inlet. In addition, a first conductance sensor and a second conductance sensor are provided on the inner tube;

One end of the annular space is connected with the water inlet pipe, and the other end is connected with the water outlet pipe.

In the embodiment provided by the utility model, the above-mentioned water storage tank is provided with an air outlet pipe.

In the embodiment provided by the utility model, the above-mentioned first valve and the second valve are quick closing valves; the third valve and the fourth valve are switching valves; the fifth valve is a pressure regulating valve.

In the embodiment provided by the utility model, the above-mentioned experimental measurement device for surface heat transfer coefficient also includes a holder, the holder includes a support rod, a connecting piece and a clamping part, and the supporting rod and the clamping part are connected through a connecting piece, And the clamping part can rotate 360 degrees around the support rod.

In the embodiment provided by the utility model, the clamping part is also provided with a first clamping space and a second clamping space, the first clamping space is used to clamp the outer tube of the double-layer injection pipe, and the second clamping space The space is used to hold the inner tube of the double-layer injection tube.

The beneficial effects of the utility model are: the experimental measurement device is simple in structure and easy to use, and has the following advantages compared with the prior art: (1) calculate the heat flow of the two-phase fluid through the heat flow absorbed by the single-phase fluid in the annular space; The surface heat transfer coefficient avoids the complexity of calculating the thermal and physical parameters of the two-phase flow; (2) through the holder, the measurement environment under different well inclinations can be simulated; (3) the temperature of the single-phase fluid in the annular space can be adjusted by itself , to simulate the influence of the external high or low temperature environment on the surface heat transfer coefficient of the two-phase flow; (4) the inner tube is equipped with a conductivity sensor, which can measure the gas holdup rate under gas-liquid mixed injection, and then analyze the different gas holdup rates. The effect of the corresponding flow regime on the surface heat transfer coefficient for two-phase flow.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following drawings will be briefly introduced in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention. Therefore, it should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained according to these drawings without creative work.

Fig. 1 structure diagram of the experimental measuring device of nitrogen and water two-phase flow surface heat transfer coefficient provided by the utility model;

Fig. 2 structure diagram of the double-layer injection pipe provided by the utility model;

Fig. 3 is a structural diagram of the holder provided by the utility model.

Shown in the figure: 100-The experimental measurement device for the surface heat transfer coefficient of nitrogen and water two-phase flow; 1-The first valve; 2-Double-layer injection pipe; 3-The second valve; 4-Venturi mixer; 5- 1st liquid flowmeter; 6-third valve; 7-water pump; 8-water storage tank; 80-outlet pipe; 9-water outlet pipe; 10-fourth valve; 11-second liquid flowmeter; 12-temperature conversion 13-nitrogen cylinder; 14-fifth valve; 15-gas flow meter; 16-holder; 160-support rod; 161-connector; 162-clamping part; 1620-first clamping space; 1622 - second clamping space; 20 - inner tube; 21 - outer tube; 22 - liquid inlet; 23 - liquid outlet; 24 - first temperature sensor; 25 - second temperature sensor; 26 - third temperature sensor; 27 - fourth temperature sensor; 28 - first conductivity sensor; 29 - second conductivity sensor.

detailed description

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

In order to make the purposes, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the utility model. Obviously, the described The embodiments described above are some of the embodiments of the present utility model, but not all of them. Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the implementation manners in the present utility model, all other implementation manners obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

In the description of the utility model, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying the Means that a device or element must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limiting the invention.

In this utility model, unless otherwise specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connection, or integration; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary, and it can be the internal communication of two components or the interaction relationship between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model according to specific situations.

In the present invention, unless otherwise specified and limited, the first feature above or below the second feature may include that the first and second features are in direct contact, and may also include that the first and second features are not in direct contact. Rather, through additional characteristic contacts between them. Moreover, the first feature on, above and above the second feature includes the first feature directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. The first feature being below, below and below the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

Example:

As shown in Figure 1, the present embodiment provides an experimental measurement device 100 for the surface heat transfer coefficient of a two-phase flow of nitrogen and water, including a first valve 1, a double-layer injection pipe 2, a second valve 3, and a Venturi connected in sequence. The mixer 4, the first liquid flow meter 5, the third valve 6, the water pump 7 and the water storage tank 8, and the water storage tank 8 is connected with the first valve 1 to form a closed circuit.

In this embodiment, the above-mentioned experimental measurement device 100 for the surface heat transfer coefficient of the two-phase flow of nitrogen and water also includes a water inlet pipe and a water outlet pipe 9 . One end of the water inlet pipe is connected to the double-layer injection pipe 2, and the other end is connected to the water pump 7, and the end of the water inlet pipe close to the water pump 7 is provided with a fourth valve 10, a second liquid flow meter 11 and a temperature converter in sequence along the water flow direction 12; One end of the outlet pipe 9 is connected to the double-layer injection pipe 2, and the other end is connected to the water storage tank 8.

In this embodiment, the above-mentioned experimental measurement device 100 for the surface heat transfer coefficient of the two-phase flow of nitrogen and water also includes an air inlet pipe and a nitrogen cylinder 13 . One end of the inlet pipe is connected to the Venturi mixer 4, and the other end is connected to the nitrogen cylinder 13, and the end of the inlet pipe close to the nitrogen cylinder 13 is provided with a fifth valve 14 and a gas flow meter 15 in sequence along the gas flow direction.

As shown in FIG. 2 , in this embodiment, the above-mentioned double-layer injection pipe 2 includes an inner pipe 20 and an outer pipe 21 , and an annular space is formed between the inner pipe 20 and the outer pipe 21 .

The outer tube 21 is provided with a first temperature sensor 24 and a second temperature sensor 25;

The inner tube 20 is provided with a liquid inlet 22, a liquid outlet 23, a third temperature sensor 26 and a fourth temperature sensor 27, the liquid outlet 23 is connected to the first valve 1, and the liquid outlet 23 is provided with a fourth temperature sensor. The sensor 27, the liquid inlet 22 is connected to the second valve 3, and the liquid inlet 22 is provided with a third temperature sensor 26, in addition, the inner tube 20 is also provided with a first conductivity sensor 28 and a second conductivity sensor 29;

One end of the annular space is connected with the water inlet pipe, and the other end is connected with the water outlet pipe 9 .

Specifically, the above-mentioned first temperature sensor 24 is used to measure the temperature when the water in the water outlet pipe 9 flows out of the annular space, and the second temperature sensor 25 is used to measure the temperature of the water in the water inlet pipe when it enters the annular space.

Similarly, the above-mentioned first conductance sensor 28 and second conductance sensor 29 can measure the air entrainment rate under gas-liquid mixed injection, and then analyze the influence of flow patterns corresponding to different air entrainment rates on the surface heat transfer coefficient of two-phase flow.

In this embodiment, the above-mentioned water storage tank 8 is provided with an air outlet pipe 80, and the air outlet pipe 80 is used to discharge the nitrogen in the gas-water mixture, so as to prevent nitrogen from entering the Venturi mixer 4 through the third valve 6 again, thereby affecting the gas-water mixture. mixing ratio.

As shown in Figure 3, in the present embodiment, the experimental measurement 100 device of the surface heat transfer coefficient of the above-mentioned nitrogen and water two-phase flow also includes a holder 16, and the holder 16 includes a support rod 160, a connecting piece 161 and a clamping device. part 162, the support rod 160 and the clamping part 162 are connected by the connecting piece 161, and the clamping part 162 can rotate 360 degrees around the support rod 160, so as to simulate the measurement environment under different well inclinations.

Specifically, the clamping part 162 is also provided with a first clamping space 1620 and a second clamping space 1622, the first clamping space 1620 is used to clamp the outer tube 21 of the double-layer injection tube 2, and the second clamping space 1622 An inner tube 20 for holding the double-layer injection tube 2 .

Specifically, in this embodiment, the first valve 1 and the second valve 3 are quick-closing valves, the third valve 6 and the fourth valve 10 are on-off valves, and the fifth valve 14 is a pressure regulating valve.

The experimental measurement 100 steps of nitrogen and water two-phase flow surface heat transfer coefficient are as follows:

(1) open nitrogen cylinder 13 and the 5th valve 14, regulate the 5th valve 14 and gas flowmeter 15, guarantee to enter the flow rate of the gas flow in the Venturi mixer 4 to experiment setting;

(2) Open the water storage tank 8, start the water pump 7, open the third valve 6, and then adjust the first liquid flow meter 5 to ensure that the water flow entering the Venturi mixer 4 reaches the flow rate set by the experiment;

(3) Open the Venturi mixer 4 to allow the gas-liquid to mix completely therein. At this time, open the fourth valve 10 and adjust the second liquid flowmeter 11 so that the single-phase water flow entering the double-layer injection pipe 2 annular space reaches the experimental design. fixed flow;

(4) Open the first valve 1 and the second valve 3 to allow the gas-water mixture in the Venturi mixer 4 to enter the inner pipe 20 of the double-layer injection pipe 2. At this time, adjust the temperature converter 12 to make the annular water temperature and There is a certain temperature difference between the temperature of the gas-liquid mixed fluid in the inner pipe 20 (the annular water temperature can be measured by the first temperature sensor 24 and the second temperature sensor 25, and the temperature of the gas-liquid mixed fluid in the inner pipe 20 can be measured by the third temperature Sensor 26 and the 4th temperature sensor 27 measure);

(5) Use the third temperature sensor 26 and the fourth temperature sensor 27 to respectively record the temperature T1 of the single-phase water in the annular space entering the annular space and the temperature T2 when it flows out of the annular space within a period of time Δt, then in the time period Δt The formula for calculating the heat transfer coefficient h of the inner surface is as follows:

In the formula: A is the heat transfer area (in this experiment, it is the inner tube 20 side area of the double-layer injection tube 2), m ² ;

(6) Record the first conductance value and the second conductance value within the time period Δt for the calculation of the gas fraction;

(7) Use the holder 16 to change the inclination angle of the double-layer injection pipe 2, and repeat the above steps (1) to (6) to complete the measurement experiment of the surface heat transfer coefficient under different well inclinations.

The beneficial effects of the experimental measurement device for the surface heat transfer coefficient of nitrogen and water two-phase flow provided by the utility model are: the experimental measurement device is simple in structure, easy to use, and has the following advantages compared with the prior art: (1) through the annular space The heat flow absorbed by the single-phase fluid is used to calculate the heat flow and surface heat transfer coefficient of the two-phase fluid, which avoids the complexity of calculating the thermal and physical parameters of the two-phase flow; (2) through the holder, the measurement under different well inclinations can be simulated (3) The temperature of the single-phase fluid in the annular space can be adjusted by itself to simulate the influence of the external high or low temperature environment on the heat transfer coefficient of the two-phase flow surface; (4) The inner tube is equipped with a conductivity sensor, which can measure the gas The gas fraction under mixed liquid injection, and then analyze the influence of the flow patterns corresponding to different gas fractions on the surface heat transfer coefficient of the two-phase flow.

The above description does not limit the utility model in any form. Although the utility model has been disclosed as above through the embodiments, it is not used to limit the utility model. Within the scope of the scheme, when the technical content disclosed above can be used to make some changes or be modified into equivalent embodiments with equivalent changes, but if it does not deviate from the content of the technical solution of the present utility model, the above embodiments shall be modified according to the technical essence of the present utility model Any simple modifications, equivalent changes and modifications all still belong to the scope of the technical solution of the present utility model.

Claims (9)

1. the experimental provision of a kind of nitrogen and water two phase flow surface coefficient of heat transfer, it is characterised in that including what is be sequentially connected First valve, double-deck ascending pipe, the second valve, venturi mixer, the first fluid flowmeter, the 3rd valve, water pump and water storage Tank, and water tank again be connected with the first valve, formation closed-loop path.

2. the experimental provision of nitrogen according to claim 1 and water two phase flow surface coefficient of heat transfer, it is characterised in that Also include water inlet pipe and outlet pipe；

Described water inlet pipe one end is connected with double-deck ascending pipe, and the other end is connected with water pump, and in one end of close water pump along current Dynamic direction is sequentially provided with the 4th valve, second liquid flowmeter and temperature divertor；

Described outlet pipe one end is connected with double-deck ascending pipe, and the other end is connected with water tank.

3. the experimental provision of nitrogen according to claim 2 and water two phase flow surface coefficient of heat transfer, it is characterised in that Also include air inlet pipe and nitrogen cylinder, described admission line one end is connected with venturi mixer, and the other end is connected with nitrogen cylinder.

4. the experimental provision of nitrogen according to claim 3 and water two phase flow surface coefficient of heat transfer, it is characterised in that Between nitrogen cylinder and venturi mixer the 5th valve and gas flowmeter are sequentially provided with along gas flow direction.

5. the experimental provision of nitrogen according to claim 4 and water two phase flow surface coefficient of heat transfer, it is characterised in that The double-deck ascending pipe includes forming annular space between inner and outer tubes, inner and outer tubes；

Outer tube is provided with the first temperature sensor and second temperature sensor；

Inner tube is provided with inlet, liquid outlet, three-temperature sensor and the 4th temperature sensor, liquid outlet and the first valve phase Even, and at liquid outlet the 4th temperature sensor is provided with, inlet and the second valve are connected, and are passed at inlet provided with the 3rd temperature Sensor, in addition, being additionally provided with the first conductivity sensor and the second conductivity sensor in inner tube；

Annular space one end is connected with water inlet pipe, and the other end is connected with outlet pipe.

6. the experimental provision of nitrogen according to claim 5 and water two phase flow surface coefficient of heat transfer, it is characterised in that The water tank is provided with escape pipe.

7. the experimental provision of nitrogen according to claim 6 and water two phase flow surface coefficient of heat transfer, it is characterised in that First valve and second valve are fast valve, and the 3rd valve and the 4th valve are switch valve, described the Five valves are pressure regulator valve.

8. the experimental provision of the nitrogen and water two phase flow surface coefficient of heat transfer according to any one of claim 1 to 7, its It is characterised by, in addition to clamper, the clamper includes support bar, connector and clamping part, the support bar and the folder Portion is held by the connector to be connected, and the clamping part can carry out 360 degree of rotations around the support bar.

9. the experimental provision of nitrogen according to claim 8 and water two phase flow surface coefficient of heat transfer, it is characterised in that The clamping part is additionally provided with the first grasping part and the second grasping part, and first grasping part is used to clamp the double-deck note Enter the outer tube of pipe, second grasping part is used for the inner tube for clamping the double-deck ascending pipe.