CN207067098U - The pressurization evaluating apparatus of foam discharging agent performance - Google Patents

Abstract

The pressurized evaluation device for the performance of the foam-discharging agent belongs to the field of oil and gas field development tools, and includes a bracket on which a high-pressure container is vertically arranged and a temperature control system connected to the high-pressure container; the upper and lower ends of the high-pressure container are respectively connected to the Nitrogen pressurization system, the upper end of the high-pressure container is also provided with a liquid inlet and a liquid discharge line, the liquid discharge line is connected to the pressure buffer container, and an exhaust line is connected to the upper end of the pressure buffer container, and the outlet of the exhaust line A gas flowmeter is connected to the end; a liquid discharge port and a sand core plate to distribute the gas evenly are arranged at the bottom of the high-pressure vessel, a pressure-resistant glass window is set on the side of the high-pressure vessel, and a scale scale is set on the side of the pressure-resistant glass window; The device can evaluate the performance of the foaming agent at different flow rates under pressurized conditions. Compared with the current evaluation device that cannot be pressurized, the utility model is used to simulate and evaluate the foaming agent, which is closer to the working conditions at the bottom of the well.

Description

Pressurized evaluation device for foam release agent performance

technical field

The utility model belongs to the field of oil and gas field production tools, in particular to a pressurized evaluation device for the performance of a foam discharge agent.

Background technique

For gas wells with low pressure, insufficient self-spraying capacity, and gas flow rate in the wellbore lower than the critical flow rate, foam drainage gas recovery technology is a relatively effective gas recovery method. Liquid-carrying property, that is, it can generate a large amount of foam, and the foam has good stability, and can smoothly carry the bottom fluid to the surface, so the evaluation of the performance of the foam drainage agent is particularly important.

Among the current evaluation methods, the airflow-stirring method is a common method used to evaluate the performance of the blowing agent (one of the important components of the foaming agent), but if the diameter of the measuring cylinder is too small (less than 3cm), there will be wall hanging Because of the simple operation, the oscillation method is widely used in the determination of the foaming ability of the solution in the laboratory, but it is difficult to control the strength, speed, direction, time, etc. of the oscillation, and the error between each experiment is relatively large. In addition, the above methods all evaluate the foam discharge agent under normal pressure, which cannot be pressurized to simulate the wellbore environment, resulting in a large difference between the performance evaluated indoors and the actual performance on site. Therefore, it is necessary to evaluate the existing foam Improvements were made to the evaluation method of the agent discharge.

Contents of the invention

In order to overcome the shortcomings of the existing evaluation technology, the utility model provides a pressurized evaluation device for the performance of the foam discharge agent, which can simulate the wellbore conditions to evaluate the performance of the foam discharge agent by means of pressurization and temperature control, so that the indoor evaluation results Closer to the actual performance on site.

In order to achieve the above object, the technical scheme of the utility model is:

The pressurized evaluation device for the performance of the foaming agent includes a bracket on which a high-pressure container is vertically arranged and a temperature control system connected to the high-pressure container; the upper and lower ends of the high-pressure container are respectively connected to the Nitrogen pressurization system, the upper end of the high-pressure container is also provided with a liquid inlet and a liquid discharge line, the liquid discharge line is connected to the pressure buffer container, and an exhaust line is connected to the upper end of the pressure buffer container, and the outlet of the exhaust line A gas flow meter is connected to the end, and a liquid discharge valve is provided on the liquid discharge pipeline; a liquid discharge port and a sand core plate for uniform gas distribution are provided at the bottom of the high-pressure vessel, and a pressure-resistant glass window is provided on the side of the high-pressure vessel. There is a scale scale on one side of the pressure-resistant glass window.

Further, the high-pressure container bears a pressure of 0.5-10 MPa.

Further, the nitrogen pressurization system includes a nitrogen cylinder and a high-pressure pipeline connected to the nitrogen cylinder, and the high-pressure pipeline is provided with a pressure reducing valve and a pressure gauge.

Further, an upper intake valve is provided on the upper intake pipeline, and a lower intake valve is provided on the lower intake pipeline.

Further, the upper intake pipeline and the lower intake pipeline are connected to the high-pressure pipeline through a six-way valve.

The beneficial effects of the utility model:

Since the nitrogen pressurization system is installed, the performance evaluation of the foam discharge agent can be realized under the pressurized state, and then the pressure control of the intake pipeline and the adjustment of the exhaust volume of the discharge pipeline combined with the gas flow meter can be further evaluated. The performance of the foaming agent at different flow rates under pressurized state, compared with the current evaluation device that cannot be pressurized, the simulated evaluation of the foaming agent by the utility model is closer to the working condition at the bottom of the well.

Description of drawings

Fig. 1 is the schematic diagram of connection of the pressurized evaluation device for foam discharge agent performance;

Fig. 2 is the foam performance evaluation result figure of five kinds of foaming agents;

Fig. 3 is the evaluation result figure of foam stabilizing performance of five kinds of foam discharge agents;

Fig. 4 is the result figure of the liquid-carrying performance evaluation of five kinds of foam discharge agents;

In the figure, 1. nitrogen cylinder, 2. six-way valve, 3a, pressure reducing valve, 3b, upper intake valve, 3c, lower intake valve, 3d, liquid discharge valve, 4. pressure gauge, 5a, upper intake Pipeline, 5b, lower intake pipeline, 6, liquid inlet, 7, liquid discharge pipeline, 8, pressure buffer container, 9, exhaust pipeline, 10, gas flow meter, 11, bracket, 12, temperature control system, 13 . Sand core board, 14. High pressure vessel, 15. Pressure glass window, 16. Scale scale, 17. Drain port, 18. High pressure pipeline.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in detail.

As shown in Figure 1, the pressurized evaluation device of the performance of the foam discharge agent includes a support 11, on which a high-pressure container 14 capable of bearing a pressure of 10MPa is vertically arranged, and a temperature control system 12 connected to the high-pressure container 14, the temperature control The system 12 is used to heat and simulate the downhole temperature; the upper and lower ends of the high-pressure container 14 are respectively connected to the nitrogen pressurization system through the upper inlet pipeline 5a and the lower inlet pipeline 5b, and an upper inlet valve 3b is arranged on the upper inlet pipeline 5a, A lower intake valve 3c is provided on the lower intake pipeline 5b, and the nitrogen pressurization system includes a nitrogen cylinder 1 and a high-pressure pipeline 18 connected with the nitrogen cylinder 1, and the high-pressure pipeline 18 is provided with a pressure reducing valve 3a and a pressure gauge 4 , the outlet end of the high-pressure pipeline 18 is respectively connected with the upper intake pipeline 5a and the lower intake pipeline 5b through the six-way valve 2; the upper end of the high-pressure vessel 14 is also provided with a liquid inlet 6 and a liquid discharge pipeline 7, and the liquid discharge pipeline 7 is connected with the pressure buffer container 8, and the upper end of the pressure buffer container 8 is connected with an exhaust pipeline 9, and the outlet end of the exhaust pipeline 9 is connected with a gas flowmeter 10, and a liquid discharge pipeline 7 is provided on the discharge pipeline 7. Valve 3d; a liquid discharge port 17 and a sand core plate 13 for evenly distributing the gas are provided at the bottom of the high-pressure container 14, and a pressure-resistant glass window 15 is provided on the side of the high-pressure container 14, which is convenient for viewing the state of the bubble-discharging agent in the high-pressure container 14, One side of the pressure-resistant glass window 15 is provided with a scale scale 16, which can check the performance of the foaming agent such as the foaming height at any time.

Utilize the utility model device to evaluate five kinds of foaming agents:

Figure 2 shows the foaming performance evaluation results of five kinds of foaming agents, and the difference between the foaming performance of the foaming agent and the normal pressure evaluation effect is small;

Figure 3 shows the evaluation results of the foam stabilizing performance of five foam discharge agents, which are quite different from the normal pressure evaluation results. The reason is that the greater the pressure, the smaller the bubble radius and the more stable the foam;

Figure 4 shows the evaluation results of the liquid-carrying performance of five foam drainage agents, which are consistent with the trend of the normal pressure evaluation results, but the pressurized evaluation results are more in line with the liquid-carrying performance of the foam drainage agents in the wellbore environment.

The working principle of the utility model:

The whole experiment is approximated as a unitary flow, and the flow analysis of the fluid is carried out according to the aerodynamic state equation and continuity equation.

P = ρRT (1)

P is the pressure, ρ is the density, R is the gas constant of a specific gas, and T is the temperature;

is the mass of the fluid flowing into or out of the control body per unit time, called the flow rate, the unit is kg/s, A is the effective cross-sectional area, and v is the average flow velocity;

According to the continuity equation of gas dynamics, ρ ₁ A ₁ v ₁ = ρ ₂ A ₂ v ₂ (3)

According to the state equation, the gas density in the pressure vessel can be obtained

The gas density in the exhaust line is

P ₁ is the pressure of the intake line, v ₁ is the flow rate of the intake line, A ₁ is the cross-sectional area of the intake line, P ₂ is the pressure of the exhaust line (atmospheric pressure), v ₂ is the flow rate of the exhaust line, A ₂ is the flow rate of the exhaust line cross-sectional area;

From (3) to (5) formula can get

Among them, P ₂ is atmospheric pressure, A ₁ and A ₂ are fixed values,

Therefore, it can be known from formula (6) that the fluid velocity in the pressure vessel can be controlled by adjusting the gas pressure of the intake pipeline and the gas flow rate of the discharge pipeline.

Before evaluating the operation, first add the foaming agent solution into the high-pressure container 14 from the liquid inlet 6 and close the liquid inlet 6, use the pressure reducing valve 3a to adjust the outlet pressure of the nitrogen pressurization system to the value required for evaluation, and open the six-way The valves connected to the high-pressure pipeline 18, the upper intake pipeline 5a and the lower intake pipeline 5b on the valve 2, and then open the upper intake valve 3b, the gas enters the high-pressure container 14 for pressure saturation, and when the required pressure value is reached, open the lower intake valve 3b. The intake valve 3c continues to be saturated for a while. Subsequently, while keeping the outlet pressure of the nitrogen pressurization system constant, open the drain valve 3d, at this time, the gas is evenly mixed into the foam discharge agent solution from the sand core plate 13 at the bottom of the high pressure vessel 14 and a large number of bubbles are formed, and the bubbles carry the solution through the drain The pipeline 7 enters the pressure buffer container 8 , the liquid carried out stays in the pressure buffer container 8 , and the gas is finally discharged through the gas flow meter 10 .

During the evaluation process, by adjusting the size of the liquid discharge valve 3d and controlling the gas flow rate, combined with the temperature control system 12, the foaming height, foam stabilization performance, and liquid carrying capacity of the foam discharge agent under different drainage conditions in the well can be simulated and evaluated and other performance, and can be visually monitored through the pressure-resistant glass window.

Claims (5)

1. the pressurization evaluating apparatus of foam discharging agent performance, including support (11), it is characterised in that：It is vertical on support (11) to be provided with height Pressure vessel (14), and the temperature control system (12) being connected with high-pressure bottle (14)；High-pressure bottle (14) upper and lower ends are distinguished Nitrogen compression system is connected to by enterprising gas pipeline (5a) and lower inlet duct line (5b), is additionally provided with high-pressure bottle (14) upper end Inlet (6) and tapping line (7), the tapping line (7) is connected with pressure buffer container (8), in pressure buffer container (8) Upper surface is connected with exhaust line (9), and the port of export of the exhaust line (9) is connected with gas flowmeter (10), in the row Liquid pipe line (7) is provided with tapping valve (3d)；High-pressure bottle (14) bottom is provided with leakage fluid dram (17) and gas is uniformly divided The core plate (13) of cloth, pressure-resistant glass vision panel (15) is provided with high-pressure bottle (14) side, in pressure-resistant glass vision panel (15) side Provided with graduated scale (16).

2. the pressurization evaluating apparatus of foam discharging agent performance as claimed in claim 1, it is characterised in that：The high-pressure bottle (14) is held Press 0.5~10MPa.

3. the pressurization evaluating apparatus of foam discharging agent performance as claimed in claim 1, it is characterised in that：The nitrogen compression system bag Include nitrogen cylinder (1) and the high pressure line (18) being connected with nitrogen cylinder (1), on high pressure line (18) be provided with pressure-reducing valve (3a) and Pressure gauge (4).

4. the pressurization evaluating apparatus of foam discharging agent performance as claimed in claim 1, it is characterised in that：In the enterprising gas pipeline (5a) is provided with upper inlet valve (3b), and lower inlet valve (3c) is provided with the lower inlet duct line (5b).

5. the pressurization evaluating apparatus of foam discharging agent performance as claimed in claim 1, it is characterised in that：The enterprising gas pipeline (5a) It is connected with lower inlet duct line (5b) by six-way valve (2) with high pressure line (18).