CN113389528B - A kind of downhole cyclone desander performance testing device and testing method - Google Patents

Abstract

The invention provides a device for testing the performance of an underground cyclone desander, which simulates the underground operation environment of the desander through a sealed container, a sucker rod, the desander, a sand supply device and a water supply device, simulates fluids with different sand contents through the sand supply device and the water supply device, separates the fluids through the desander, obtains the weight of the separated liquid and sand and the suspension point load in the separation process, can determine the desanding efficiency of the desander aiming at the fluids with different sand contents according to the weight of the liquid and the sand, can determine the service life of the desander according to the suspension point load, and uses the obtained desanding efficiency and the service life as the theoretical basis for improving the structure of the desander, thereby being beneficial to optimizing the structure of the desander and improving the desanding efficiency.

Description

A kind of downhole cyclone desander performance testing device and testing method

technical field

The invention belongs to the technical field of oil production engineering, and relates to a performance testing device and a testing method of a downhole cyclone desander.

Background technique

The rod pump production system accounts for more than 80% of the total production of oil wells in my country. During the production process, due to the low cementation strength of the reservoir rock and the unreasonable production system, the rock skeleton is damaged, and the formation sand flows from the formation to the production fluid. In the wellbore, downhole accidents such as wellbore sand burial, sucker rod pumping and other downhole tools wear and tear, and tubing leakage are caused. In order to solve the problems caused by sand production in oil wells economically and effectively, the downhole cyclone desander based on liquid cyclone technology can realize the separation of sand and liquid, prevent the erosion and wear of the sand to the downhole equipment, and achieve a good sand removal effect.

The structure of the downhole cyclone desander determines the sand removal efficiency and service life of the desander. Therefore, the optimization of the structure of the desander requires the determination of the sand removal efficiency and service life of the existing desander, but the current laboratory test The sand control efficiency of the sand control screen is mainly tested, but the sand removal efficiency of the downhole cyclone desander is not measured. The influence of factors such as the flow rate of the sand removal fluid), the diameter of the sand particles, and the life of the desander makes the determination of the sand removal efficiency and service life particularly difficult.

SUMMARY OF THE INVENTION

Aiming at the problems existing in the prior art, the present invention provides a device and a testing method for testing the performance of a downhole cyclone desander. Desander efficiency and the effect of different downhole cyclone desanders on oil well production.

The present invention is achieved through the following technical solutions:

1. a test device for downhole cyclone desander performance, is characterized in that, comprises sealed container, rod pump, sucker rod, desander, sand supply device and water supply device;

The rod pump and the desander are assembled in the cavity of the sealed container, the lower end of the rod pump is connected with the desander, the upper end of the rod pump is connected with a sucker rod, and the upper end of the sucker rod is connected with a load measuring device, The load measuring device is connected with the driving device, and the sand supply device and the water supply device are located outside the sealed container and are respectively connected with the desander for feeding the sand-water mixture into the desander.

2. The test device for the performance of a downhole cyclone desander according to claim 1, wherein the cavity of the sealed container is provided with an oil pipe, and a rod pump and a desander are fitted in the oil pipe .

3. The test device for the performance of a downhole cyclone desander according to claim 2, wherein the upper end of the oil pipe is connected to a liquid collecting tank by a drain line, and the lower end of the oil pipe is connected to a sand collecting tank by a sand settling pipe There is a flow meter on the discharge line.

4. the test device of a kind of downhole cyclone desander performance according to claim 1, is characterized in that, described sand supply device comprises sand supply box and peristaltic pump, and one end of peristaltic pump passes through sand supply pipeline and desanding One end of the peristaltic pump is connected to the sand supply box, and the other end of the peristaltic pump is filled with sand.

5. The device for testing the performance of a downhole cyclone desander according to claim 4, wherein the water supply device comprises a water supply tank, the outlet of the water supply tank is connected to a water supply pump, and the outlet of the water supply pump is connected through a water supply pipeline The sand supply pipeline and the water supply pipeline are provided with a throttle valve.

6. the method for testing the sand removal efficiency of the test device of a kind of downhole cyclone desander performance described in any one of claim 1-5, is characterized in that, comprises the following steps:

Step 1. Install the desander to be tested in the test device;

Step 2. Input the fluid for setting the sand content into the desander;

Step 3, the desander separates the fluid, and obtains the weight of the liquid and sand separated by the desander, and the suspended point load of the desander during the desanding process;

Step 4. Determine the sand removal efficiency of the desander according to the weight of sand and liquid; determine the service life of the desander according to the suspended point load;

Step 5: Adjust the sand content ratio and repeat steps 2-4 to obtain the sand removal efficiency and service life of the de-sander corresponding to fluids with different sand content ratios;

Step 6. Repeat steps 2-5 by replacing different types of desanders to obtain the sand removal efficiency and service life of different types of desanders under different sand content ratios.

7. the method for testing the sand removal efficiency of a test device for the performance of a downhole cyclone desander according to claim 6, wherein in step 3, the flow rate of the separated liquid is obtained according to the flow meter, and the flow rate determines the weight of the liquid ; Dry and weigh the separated sand to obtain the weight of the sand.

8. the sand removal efficiency test method of the test device of a kind of downhole cyclone desander performance according to claim 6, is characterized in that, in step 4, the determination method of sand removal efficiency is as follows:

where W ₁ and W ₂ are the weights of sand and liquid, respectively.

9. the sand removal efficiency test method of the test device of a kind of downhole cyclone desander performance according to claim 6, is characterized in that, in step 4, the determination method of the service life of desander is as follows:

When the measured hanging point load value is within the preset load range, the desander is in a normal state. When the measured hanging point load value exceeds the preset load range, record the time from the test device startup to this moment, and get the sand removal service life of the appliance.

10. The method for testing the sand removal efficiency of a test device for the performance of a downhole cyclone desander according to claim 6, characterized in that, when carrying out the sand removal efficiency test, in step 2, the device is input into the desander. Quantitative fluid for determining the sand content ratio. In step 5, the sand content ratio of the fluid is adjusted and the total amount of the input fluid is kept unchanged.

Compared with the prior art, the present invention has the following beneficial technical effects:

The invention provides a test device for the performance of a downhole cyclone desander, which simulates the downhole operating environment of the desander through a sealed container, a rod pump, a sucker rod, a desander, a sand supply device and a water supply device. , simulate fluids with different sand contents through the sand supply device and water supply device, and separate the fluid through the desander to obtain the weight of the separated liquid and sand, as well as the suspended point load during the separation process, according to the liquid and sand. The weight can determine the sand removal efficiency of the desander for fluids with different sand contents, and the service life of the desander can be determined according to the suspended point load, and the obtained sand removal efficiency and service life can be used as the theory for the improvement of the desander Based on this, it is helpful to optimize the structure of the desander and improve the desander efficiency.

Description of drawings

Fig. 1 is the structural representation of the performance testing device of desander of the present invention;

In the figure, 1. Driving device, 2. Load measuring device, 3. Sucker rod, 4. Oil pipe, 5. Drain line, 6. Flow meter, 7. Oil pipe fixing device, 8. Liquid collecting tank, 9. Airtight Container, 10. Tubing nipple, 11. Desander, 12. Sand settling tube, 13. Valve, 14. Sand collection box, 15. Rod pump, 16. Sand supply line, 17. Sand supply box, 18. Peristaltic pump, 19. Throttle valve, 20. Water supply line, 21. Water supply tank, 22. Feed water pump.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings, which are to explain rather than limit the present invention.

Referring to Figure 1, a test device for the performance of a downhole cyclone desander includes a sealed container 9, an oil pipe 4, a rod pump 15, a sucker rod 3, a desander 11, a sand supply device and a water supply device.

The oil pipe is fitted in the cavity of the sealed container 9 and fixed by the oil pipe fixing device, the rod pump 15 and the desander 11 are fitted in the oil pipe, and the lower end of the rod pump 15 is connected with the upper end of the oil pipe short joint 10 , the lower end of the tubing pup 10 is connected to the desander 11, the upper end of the rod pump 15 is connected to the sucker rod 3, the upper end of the sucker rod 3 is connected to the load measuring device 2, the load measuring device 2 is connected to the driving device, and the sand supply device The water supply device and the water supply device are located outside the sealed container 9, and are respectively connected with the desander for inputting the sand-water mixture to the desander.

The upper end of the above-mentioned oil pipe is connected to the liquid collecting tank 8 through the drain line 5, and the lower end of the sealed container is connected to the sand collecting tank 14 through the sand settling tube 12. The inlet of the sand settling tube 12 is located at the lower end of the desander. The valve 13; the discharge line 5 is provided with a flow meter 6.

The sand supply device includes a sand supply box 17 and a peristaltic pump 18. One end of the peristaltic pump 18 is connected to one end of the sand remover through the sand supply pipeline 16, and the other end of the peristaltic pump 18 is connected to the sand supply box 17. Fill with sand.

The water supply device includes a water supply tank 21, the outlet of the water supply tank is connected to the water supply pump 22, the outlet of the water supply pump 22 is connected to the sand supply pipeline 16 through the water supply pipeline 20, and the water supply pipeline 20 is provided with a throttle valve 19, and water and sand are in the sand supply pipeline. The fluid with a certain sand content rate formed in the medium enters the desander 11 .

The water supply tank 21 is filled with an aqueous solution of xanthan gum, which is used to simulate the viscosity of petroleum, and the proportion of xanthan gum can be adjusted to simulate petroleum with different viscosities.

When the test device is started, the peristaltic pump 17 and the feed pump 22 are turned on to pump the fluid mixed with sand and water into the desander 11 according to a certain proportion. 2. The movement in the oil pipe 4 drives the rod pump 15 to draw out the fluid separated by the desander 11, and flows into the liquid collecting tank 8 along the drain line 5. The lower end of the rod pump 15 is shorted by the oil pipe. Desanders 11 of different specifications are installed in the section 10. The sand separated by the desander enters the sand tube 12. After a period of time, the valve 13 is opened to collect the sand in the sand tube 12 into the sand collection box 14.

The test method of a performance testing device for a downhole cyclone desander provided by the present invention will be described in detail below, including a method for testing the desander efficiency of the desander, a method for testing the service life of the desander, and a method for testing the suspension of the desander. Point load test method.

Example 1

The method for testing the sand removal efficiency of the above-mentioned downhole cyclone desander performance testing device comprises the following steps:

Step 1. Install the desander to be tested at the lower end of the tubing sub 10 .

Step 2. Start the test device, and input the quantitative fluid with the set sand content into the desander;

Specifically, a certain amount of sand-containing fluid is pumped into the desander 11 through the feed water pump 22 and the peristaltic pump 18, and at the same time, the driving device 1 is used to provide power to drive the sucker rod 3 to drive the rod pump 15 to suck the fluid into the desander 11. In the liquid collecting tank 8 , the test device is then shut down, and the sand in the sand settling tube 12 is introduced into the sand collecting tank 14 .

The quantitative fluid is a predetermined weight of fluid.

Step 3, drying and weighing the sand in the sand collecting box 14, and weighing the liquid in the liquid collecting box 8 at the same time, the weights of the sand and the liquid are W ₁ and W ₂ respectively.

Step 4. Determine the sand removal efficiency of the sand remover according to the weight of sand and liquid.

Step 5: Adjust the sand content ratio and keep the total weight of the fluid unchanged, and repeat steps 2-4 to obtain the sand removal efficiency of the sand remover corresponding to fluids with different sand content ratios.

Step 6. Repeat steps 2-5 by replacing different types of desanders to obtain the sand removal efficiencies of different types of desanders under different sand content ratios, so as to realize the sand removal efficiency of different swirl angles and cone lengths. Determine and screen out the sand remover with the highest sand removal efficiency, and optimize the structure of other types of sand removers accordingly.

Example 2

The service life testing method of the above-mentioned downhole cyclone desander performance testing device comprises the following steps:

Step 1. Install the desander to be tested at the lower end of the tubing sub 10 .

Step 2. Start the test device and input the fluid with the set sand content into the desander;

Through the feed water pump 22 and the peristaltic pump 18, the sand-containing fluid with a certain sand content rate is continuously pumped into the downhole cyclone desander 11, and the driving device 1 is used to provide power to drive the sucker rod 3 to drive the rod pump 15. The fluid is pumped into the liquid collecting tank 8, the change of the load measuring device is observed, and the normal working time of the downhole desander is recorded.

Step 3: Determine the service life of the desander according to the suspended point load value measured by the load measuring device during the working process of the test device.

Specifically, when the measured suspended point load value is within the preset load range, the desander is in a normal state. When the measured suspended point load value exceeds the preset load range, it is determined that the desander is damaged, and the test device is recorded. The time from startup to this moment can get the service life of the desander.

Step 4: Adjust the sand content ratio in the fluid, and repeat steps 2 and 3 to obtain the service life of the fluid with different sand content ratios of the desander.

Step 5. Repeat steps 2-4 by replacing different types of desanders to obtain the service life of different types of desanders under different sand content ratios, and screen out the desanders with the highest service life, so as to determine the structure of other desanders. optimize.

Example 3

The hanging point load testing method of the above-mentioned downhole cyclone desander performance testing device, comprising the following steps:

Step 1. Install the desander to be tested at the lower end of the tubing sub 10 .

Step 2. Start the test device, and input the fluid with the set sand content rate into the desander within the set time range;

The sand-containing fluid is pumped into the desander 11 through the feed water pump 22 and the peristaltic pump 18 within a specified time, and at the same time, the driving device 1 is used to provide power, and the sucker rod 3 drives the rod pump 15 to pump the fluid into the liquid collection tank 8 middle.

Step 3: Obtain the suspended point load value measured by the load measuring device 2, and the flow rate value of the liquid obtained by the flow meter.

The flow of this liquid, expressed as the production of the well.

Step 4: Adjust the sand content in the fluid, and repeat steps 2 and 3 to obtain fluid flow values corresponding to different sand content in the desander.

Step 5. Repeat steps 2-4 by replacing different types of desanders to obtain the flow values of different types of desanders under different sand contents.

According to the flow values of different types of desanders under different sand content, the desanders that have a greater impact on oil well production are screened out, so as to optimize the structure of other desanders.

The above content is only to illustrate the technical idea of the present invention, and cannot limit the protection scope of the present invention. Any changes made on the basis of the technical solution according to the technical idea proposed by the present invention all fall within the scope of the claims of the present invention. within the scope of protection.

Claims (8)

1. a test device for the performance of a downhole cyclone desander, characterized in that it comprises a sealed container (9), a rod pump (15), a sucker rod (3), a desander (11), a sand supply device and water supply installations; The rod pump (15) and the desander (11) are assembled in the cavity of the sealed container (9), the lower end of the rod pump (15) is connected with the desander (11), and the rod pump (15) The upper end of the sucker rod (3) is connected to the sucker rod (3), the upper end of the sucker rod (3) is connected to the load measuring device (2), the load measuring device (2) is connected to the driving device, and the sand supply device and the water supply device are located in the sealed container (9). The outside of the sand remover is connected to the desander, which is used to input the sand-water mixture to the desander; The method for testing the sand removal efficiency of the device for testing the performance of the downhole cyclone desander includes the following steps: Step 1. Install the desander to be tested in the test device; Step 2. Input the fluid for setting the sand content into the desander; Step 3, the desander separates the fluid, and obtains the weight of the liquid and sand separated by the desander, and the suspended point load of the desander during the desanding process; Step 4. Determine the sand removal efficiency of the desander according to the weight of sand and liquid; determine the service life of the desander according to the suspended point load; The method for determining the sand removal efficiency in step 4 is as follows:

where W ₁ and W ₂ are the weights of sand and liquid, respectively; Step 5: Adjust the sand content ratio and repeat steps 2-4 to obtain the sand removal efficiency and service life of the de-sander corresponding to fluids with different sand content ratios; Step 6. Repeat steps 2-5 by replacing different types of desanders to obtain the sand removal efficiency and service life of different types of desanders under different sand content ratios. 2. The device for testing the performance of a downhole cyclone desander according to claim 1, wherein the cavity of the sealed container (9) is provided with an oil pipe (4) and a rod pump (15) And the desander (11) is assembled in the oil pipe. 3. The test device for the performance of a downhole cyclone desander according to claim 2, wherein the upper end of the oil pipe is connected to the liquid collecting tank (8) through the drain line (5), and the lower end of the oil pipe passes through The sand settling pipe (12) is connected to the sand collecting box (14), and a flow meter (6) is arranged on the liquid discharge pipeline (5). 4. The test device for the performance of a downhole cyclone desander according to claim 1, wherein the sand supply device comprises a sand supply box (17) and a peristaltic pump (18), and the peristaltic pump (18) One end of the peristaltic pump (18) is connected to one end of the desander through a sand supply pipeline (16), and the other end of the peristaltic pump (18) is connected to a sand supply box (17), and the sand supply box (17) is filled with sand. 5. The device for testing the performance of a downhole cyclone desander according to claim 4, wherein the water supply device comprises a water supply tank (21), the outlet of the water supply tank is connected to a water supply pump (22), and the water supply pump The outlet of (22) is connected to the sand supply pipeline (16) through the water supply pipeline (20), and the water supply pipeline (20) is provided with a throttle valve (19). 6. the sand removal efficiency test method of the test device of a kind of downhole cyclone desander performance according to claim 1, is characterized in that, in step 3, obtains the flow rate of liquid after separation according to flowmeter, and flow rate determines the weight of liquid ; Dry and weigh the separated sand to obtain the weight of the sand. 7. the sand removal efficiency test method of the test device of a kind of downhole cyclone desander performance according to claim 1, is characterized in that, in step 4, the determination method of the service life of desander is as follows: When the measured hanging point load value is within the preset load range, the desander is in a normal state. When the measured hanging point load value exceeds the preset load range, record the time from the test device startup to this moment, and get the sand removal service life of the appliance. 8. the sand removal efficiency test method of the test device of a kind of downhole cyclone desander performance according to claim 1, is characterized in that, when carrying out sand removal efficiency test, in step 2, input device into desander. Quantitative fluid for determining the sand content ratio. In step 5, the sand content ratio of the fluid is adjusted and the total amount of the input fluid is kept unchanged.

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