Petroleum pipe high-temperature external pressure collapse test device and test method thereof

Abstract

The invention belongs to the field of petroleum pipe test equipment, and relates to a petroleum pipe high-temperature external pressure collapse test device and a test method thereof. Comprising a testing device with a cavity, the cavity is used for containing a petroleum pipe sample, the two ends of the petroleum pipe sample make contact with the inner side of the testing device, and an annulus is formed between the testing device and the petroleum pipe sample, that is, the interior of the petroleum pipe sample is isolated from the annulus. The testing device is respectively connected with the liquid pressurizing device, the cyclic heating device and the sensor, and the liquid pressurizing device and the cyclic heating device are both communicated with the annulus. The sensor is respectively communicated with an annulus and an inner hole of a petroleum pipe sample, the sensor is connected with the data acquisition system, the sensor transmits acquired pressure data to the data acquisition system, and the data acquisition system is used for acquiring and processing the data. The device can be used for testing the collapse resistance of the petroleum pipe in a high-temperature environment, a petroleum pipe sample is convenient to install and operate, and the petroleum pipe sample is not influenced by an axial additional load in the testing process.

Description

Technical Field

[0001] The invention belongs to the field of petroleum pipe test equipment and relates to a high-temperature external pressure collapse test device for a petroleum pipe and an experimental method thereof. Background Art

[0002] With the increasing exploration and development of deep wells, ultra-deep wells, shale oil and gas, the formation conditions and medium environment of oil and gas fields have become more demanding and complex, and various failure risk events have also followed one after another. In particular, the problem of casing strings being crushed and deformed by external pressure under high-temperature conditions underground is very prominent. Effective evaluation of the casing's anti-crushing performance under high-temperature conditions is of great significance to ensuring the quality and safety of the pipes used in oil and gas production.

[0003] The casing anti-collapse performance is mainly tested by external pressure to failure test. At present, the horizontal welding plug and vertical flexible seal are mainly used to establish a pressure chamber with the experimental equipment, and the external pressure to failure test is carried out under normal temperature environment using water medium. However, there is currently a lack of special test equipment for the casing external pressure to failure test under high temperature environment. Therefore, a high temperature external pressure collapse test device for oil pipe is urgently needed. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide a high-temperature external pressure collapse test device for oil pipes and an experimental method thereof. The device can realize the test of the anti-collapse performance of oil pipes under high temperature environment, is easy to operate, and the oil pipe samples are not affected by the axial additional load during the test. The method can effectively ensure the accuracy of the test data and the high test pressure, and provide data support for the design and use of oil casing.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] A high-temperature external pressure collapse test device for a petroleum pipe comprises a test device containing a cavity, wherein the cavity of the test device is used to house a petroleum pipe sample, two ports of the petroleum pipe sample are in contact with the inner wall of the cavity of the test device, an annulus is formed between the test device and the petroleum pipe sample, the test device is respectively connected to a liquid pressurizing device, a circulating heating device and a sensor, the liquid pressurizing device and the circulating heating device are both connected to the annulus, one end of the sensor is connected to the annulus, and the other end of the sensor is connected to the inside of the petroleum pipe sample, and the sensor is connected to a data acquisition system.

[0007] The testing device comprises a cylinder body, both ends of which are provided with sealing flanges, and two ports of the petroleum pipe sample are in contact with the inner sides of the two sealing flanges respectively.

[0008] The testing device is connected to the liquid pressurizing device, the circulating heating device and the sensor respectively through high-pressure pipelines, and a plurality of threaded detection ports for connecting the high-pressure pipelines are arranged on the testing device.

[0009] Stop valves are provided on the high-pressure pipelines between the thread detection port and the liquid pressurizing device and the circulating heating device.

[0010] A sealing ring is arranged on the sealing flange, the sealing ring is located between the petroleum pipe sample and the cylinder body, a sample sealing device is arranged between the petroleum pipe sample and the sealing ring, and sealing elements are arranged between the sample sealing device, the petroleum pipe sample and the sealing ring.

[0011] A sealing member is arranged between the sealing ring and the cylinder body.

[0012] The sealing flange is fixedly connected to the cylinder body by bolts.

[0013] The testing device is arranged inside the protection device, and a mounting seat for mounting the testing device is arranged inside the protection device.

[0014] The sensor is connected to the data acquisition system via a transmission optical cable.

[0015] A high temperature external pressure collapse test method for a petroleum pipe comprises the following steps:

[0016] S1. Fill the interior of the petroleum pipe sample with a temperature-resistant medium;

[0017] S2. Inject medium into the annulus between the test device and the oil pipe sample through the liquid pressurizing device, and heat the medium in the annulus to 180°C through the circulating heating device;

[0018] S3. The medium in the annulus is continuously pressurized by a liquid pressurizing device, and the pressure values ​​inside and outside the oil pipe sample are collected by a sensor, and the pressure values ​​inside and outside the oil pipe sample are transmitted to a data acquisition system until the oil pipe sample is crushed.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The experimental device of the present invention comprises a test device containing a cavity, wherein the cavity of the test device is used to house a petroleum pipe sample, and two ports of the petroleum pipe sample are in contact with the inner wall of the cavity of the test device, and are used to isolate the inner and outer sides of the petroleum pipe sample, and an annulus is formed between the test device and the petroleum pipe sample, that is, the inside of the petroleum pipe sample is isolated from the annulus. The test device is respectively connected to a liquid pressurizing device, a circulating heating device and a sensor, and the liquid pressurizing device and the circulating heating device are both connected to the annulus, and the liquid pressurizing device is used to inject a medium into the annulus and pressurize the medium, and the circulating heating device is used to heat the medium inside the annulus. One end of the sensor is connected to the annulus, and the other end of the sensor is connected to the inner hole of the petroleum pipe sample. The sensor is connected to a data acquisition system, and the sensor transmits the collected pressure data to the data acquisition system, and the data acquisition system is used to collect and process the data. The device can test the anti-collapse performance of petroleum pipes under high temperature environment, and the petroleum pipe samples are easy to install and operate, and the petroleum pipe samples are not affected by axial additional loads during the test.

[0021] The method of the present invention is as follows: the interior of the oil pipe sample is filled with a temperature-resistant medium. The medium is injected into the annulus between the test device and the oil pipe sample by a liquid pressurizing device, and the medium in the annulus is heated to 180° C. by a circulating heating device. The medium in the annulus is continuously pressurized by the liquid pressurizing device, and the pressure values ​​inside and outside the oil pipe sample are collected by a sensor, and the pressure values ​​inside and outside the oil pipe sample are transmitted to a data acquisition system until the oil pipe sample is crushed. The method can effectively ensure the accuracy of the test data and the high test pressure, provide data support for the design and use of oil casing, and is of great significance for ensuring the quality and safety of the pipes used in the oil and gas production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of a high-temperature external pressure collapse test system for a petroleum pipe according to the present invention;

[0023] Figure 2 It is a schematic diagram of the structure of the testing device of the present invention;

[0024] Figure 3 It is the assembly relationship diagram of the cylinder body and the oil pipe sample of the present invention;

[0025] Figure 4 It is a planed front view of the structure of the testing device of the present invention;

[0026] Figure 5 It is a side view of the testing device structure of the present invention;

[0027] Figure 6 It is a schematic diagram of the cylinder sealing flange structure of the present invention;

[0028] Figure 7 It is a schematic diagram of the structure of the sample sealing device of the present invention.

[0029] Among them, 1. test device; 2. liquid pressurizing device; 3. data acquisition system; 4. circulating heating device; 5. sensor; 6. high-pressure pipeline; 7. transmission optical cable; 8. stop valve; 9. cylinder body; 10. sealing flange; 11. sealing retaining ring; 12. sample sealing device; 13. seal; 14. retaining ring; 15. bolt; 16. protective device; 18. threaded inspection port; 20. oil pipe sample; 26. sealing ring. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with the accompanying drawings.

[0031] like Figure 1 As shown, a high-temperature external pressure collapse test device for oil pipes includes a test device 1 containing a cavity. The cavity of the test device 1 is used to place an oil pipe sample 20. The two ports of the oil pipe sample 20 are in contact with the inner wall of the cavity of the test device 1, which is used to isolate the inside and outside of the oil pipe sample 20. An annulus is formed between the test device 1 and the oil pipe sample 20, that is, the inside of the oil pipe sample 20 is isolated from the annulus. The test device 1 is respectively connected to a liquid pressurizing device 2, a circulating heating device 4 and a sensor 5. The liquid pressurizing device 2 and the circulating heating device 4 are both connected to the annulus. The liquid pressurizing device 2 is used to inject a medium into the annulus and pressurize the medium to provide the pressure required for the experiment. The circulating heating device 4 is used to heat the medium inside the annulus to provide the temperature required for the experiment. The test device 1 is connected to a sensor 5 for measuring the pressure difference between the inside and outside of the oil pipe sample 20. One end of the sensor 5 is connected to the inner hole of the oil pipe sample 20, and the other end of the sensor 5 is connected to the annulus to measure the pressure difference between the inside and outside of the oil pipe sample 20. The sensor 5 is connected to the data acquisition system 3, and the sensor 5 transmits the collected pressure data to the data acquisition system 3, and the data acquisition system 3 is used for data collection and processing. The device can test and evaluate the anti-collapse performance of the oil pipe under high temperature environment. The oil pipe sample 20 is easy to install, and the oil pipe sample 20 does not need to be welded with a plug. The test pressure is high and the operation is convenient. During the test, the oil pipe sample 20 is not affected by the axial additional load.

[0032] Preferably, Figure 2 , Figure 3 and Figure 4As shown, the test device 1 includes a cylinder 9, and sealing flanges 10 are provided at both ends of the cylinder 9. The two ports of the oil pipe sample 20 are in contact with the inner sides of the two sealing flanges 10 respectively. That is, the sealing flanges 10 are used to seal the cylinder 9 and the oil pipe sample 20. The cylinder 9 is made of 34CrNi3Mo and is subjected to a modulation heat treatment: HB241-286. The length of the cylinder 9 is 1600mm, the outer diameter of the cylinder 9 is Φ500mm, and the inner diameter of the cylinder 9 is Φ300mm. The sealing flange 10 is made of 42CrMo and is subjected to a modulation treatment: 32~36HRC. The cylinder sealing flanges 10 are fixed to the cylinder 9 by 12 hexagon socket bolts at both ends of the cylinder 9. The device is suitable for oil pipe samples 20 with an outer diameter of Φ60.3mm~Φ177.8mm, the maximum test pressure is 207MPa, and the maximum test temperature is 210℃.

[0033] like Figure 1 As shown, the test device 1 is connected to the liquid pressurizing device 2, the circulating heating device 4 and the sensor 5 through the high-pressure pipeline 6, and the test device 1 is provided with a plurality of threaded detection ports 18 for connecting the high-pressure pipeline 6. Figure 2 , Figure 3 and Figure 4 shown.

[0034] Preferably, five thread detection ports 18 are provided on the cylinder body 9, and one thread detection port 18 is provided on each of the two sealing flanges 10. The thread detection ports 18 on the sealing flanges 10 are connected to the oil pipe sample 20, and the thread detection ports 18 on the cylinder body 9 are all connected to the annulus. Both ends of the liquid pressurizing device 2 and both ends of the circulating heating device 4 are connected to the thread detection ports 18 on the cylinder body 9 through the high-pressure pipeline 6. One end of the sensor 5 is connected to the thread detection port 18 on the cylinder body 9 through the high-pressure pipeline 6, and the other end of the sensor 5 is connected to the thread detection port 18 on the sealing flange 10 through the high-pressure pipeline 6. The thread detection port 18 on one of the sealing flanges 10 is used to connect to the high-pressure pipeline 6, and a thread plug is provided on the thread detection port 18 of the other sealing flange 10. After the thread plug is removed, liquid can be added to the inside of the oil pipe sample 20 through the thread detection port 18.

[0035] like Figure 1 As shown, a stop valve 8 is provided on the high-pressure pipeline 6 between the thread detection port 18 and the liquid pressurizing device 2 and the circulating heating device 4.

[0036] like Figure 4As shown, a sealing ring 26 is provided on the sealing flange 10, and the sealing ring 26 is located between the petroleum pipe sample 20 and the cylinder body 9. A sample sealing device 12 is provided between the petroleum pipe sample 20 and the sealing ring 26. The sample sealing device 12 is sleeved on the petroleum pipe sample 20, and a sealing member 13 is provided between the sample sealing device 12, the petroleum pipe sample 20 and the sealing ring 26. The sample sealing device 12 is made of copper powder reinforced polytetrafluoroethylene, and a groove matching the sealing member 13 is provided on the sample sealing device 12. The sealing member 13 is made of ether-containing fluororubber.

[0037] Preferably, a retaining ring 14 is provided between the sealing ring 26 and the cylinder body 9 , and the retaining ring 14 is located between the sample sealing device 12 and the sealing flange 10 .

[0038] like Figure 4 As shown, a seal 13 is provided between the sealing ring 26 and the cylinder body 9 .

[0039] Preferably, a sealing retaining ring 11 is provided between the sealing ring 26 and the cylinder body 9 . The sealing retaining ring 11 is located between the sealing member 13 and the sealing flange 10 . The sealing retaining ring 11 is made of fiber-reinforced Teflon and is provided with an inner groove matching the sealing member 13 .

[0040] like Figure 2 , Figure 3 , Figure 4 and Figure 6 As shown, the sealing flange 10 is fixedly connected to the cylinder body 9 by bolts 15. Figure 5 As shown, twelve bolts 15 are provided on the sealing flange 10 .

[0041] like Figure 1 As shown, the testing device 1 is arranged inside the protection device 16 , and a mounting seat for mounting the testing device 1 is arranged inside the protection device 16 .

[0042] like Figure 1 As shown, the sensor 5 is connected to the data acquisition system 3 via a transmission optical cable 7 .

[0043] A high temperature external pressure collapse test method for a petroleum pipe comprises the following steps:

[0044] S1. Fill the interior of the oil pipe sample 20 with a temperature-resistant medium;

[0045] S2. Inject medium into the annulus between the test device 1 and the oil pipe sample 20 through the liquid pressurizing device 2, and heat the medium in the annulus to 180° C. through the circulating heating device 4;

[0046] S3. The medium in the annulus is continuously pressurized by the liquid pressurizing device 2, and the pressure values ​​inside and outside the oil pipe sample 20 are collected by the sensor 5, and the pressure values ​​inside and outside the oil pipe sample 20 are transmitted to the data acquisition system 3 until the oil pipe sample 20 is crushed.

[0047] A high temperature external pressure collapse test method for petroleum pipe is as follows:

[0048] S1. Process the length of the oil pipe sample 20 to 1580mm and round the corners at both ends;

[0049] S2. Assemble the oil pipe sample 20 inside the test device 1 and assemble the device;

[0050] S3. Open the threaded plug on the sealing flange 10 that is not connected to the high-pressure pipeline 6, inject the temperature-resistant medium into the oil pipe sample 20 through the threaded detection port 18, and after the oil pipe sample 20 is filled with the temperature-resistant medium, the threaded detection port 18 is opened by the threaded plug;

[0051] S4. Open the stop valve 8 between the liquid pressurizing device 2 and the circulating heating device 4 and the testing device 1, and inject the medium into the annulus between the testing device 1 and the oil pipe sample 20 through the liquid pressurizing device 2, and check the sealing of the device. If the sealing is intact, heat the medium in the annulus to 180°C through the circulating heating device 4. If the sealing is not good and there is medium leakage, it is necessary to find out the cause and repair it. After the repair is completed, continue the experiment;

[0052] S5. Close the stop valve 8 between the circulating heating device 4 and the testing device 1, continuously pressurize the medium in the annulus through the liquid pressurizing device 2, collect the pressure values ​​inside and outside the oil pipe sample 20 through the sensor 5, and transmit the pressure values ​​inside and outside the oil pipe sample 20 to the data acquisition system 3 until the oil pipe sample 20 is crushed;

[0053] S6. Open the stop valve 8 in the high-pressure pipeline between the circulating heating device 4 and the testing device 1 to lower the oil temperature and return the oil. After the oil return operation is completed, dismantle the high-pressure pipeline 6, dismantle the sealing flange 10 and take out the oil pipe sample 20, and the test is completed.

[0054] Preferably, the method of the present invention can effectively ensure the accuracy of test data and high test pressure, and can provide data support for the design and use of oil casing, which is of great significance for ensuring the quality and safety of pipes used in the process of oil and gas production.

[0055] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high temperature external pressure collapse test device for petroleum pipes, characterized in that: The invention comprises a test device (1) containing a cavity, wherein the cavity of the test device (1) is used to accommodate a petroleum pipe sample (20), two ports of the petroleum pipe sample (20) are in contact with the inner wall of the cavity of the test device (1), an annulus is formed between the test device (1) and the petroleum pipe sample (20), the test device (1) is respectively connected to a liquid pressurizing device (2), a circulating heating device (4) and a sensor (5), the liquid pressurizing device (2) and the circulating heating device (4) are both connected to the annulus, one end of the sensor (5) is connected to the annulus, and the other end of the sensor (5) is connected to the inner hole of the petroleum pipe sample (20), and the sensor (5) is connected to a data acquisition system (3).

2. A high temperature external pressure collapse test device for petroleum pipes as claimed in claim 1, characterized in that: The testing device (1) comprises a cylinder (9), both ends of which are provided with sealing flanges (10), and the two ports of the oil pipe sample (20) are in contact with the inner sides of the two sealing flanges (10) respectively.

3. A high temperature external pressure collapse test device for petroleum pipes as claimed in claim 2, characterized in that: The test device (1) is connected to the liquid pressurizing device (2), the circulating heating device (4) and the sensor (5) respectively through high-pressure pipelines (6), and the test device (1) is provided with a plurality of threaded detection ports (18) for connecting the high-pressure pipelines (6).

4. A high temperature external pressure collapse test device for petroleum pipes as claimed in claim 3, characterized in that: A stop valve (8) is provided on the high-pressure pipeline (6) between the thread detection port (18) and the liquid pressurizing device (2) and the circulating heating device (4).

5. The high temperature external pressure collapse test device for petroleum pipes according to claim 2, characterized in that: A sealing ring (26) is provided on the sealing flange (10), the sealing ring (26) is located between the petroleum pipe sample (20) and the cylinder body (9), a sample sealing device (12) is provided between the petroleum pipe sample (20) and the sealing ring (26), and a sealing member (13) is provided between the sample sealing device (12), the petroleum pipe sample (20) and the sealing ring (26).

6. A high temperature external pressure collapse test device for petroleum pipes as claimed in claim 2, characterized in that: A sealing member (13) is provided between the sealing ring (26) and the cylinder body (9).

7. A high temperature external pressure collapse test device for petroleum pipes as claimed in claim 2, characterized in that: The sealing flange (10) is fixedly connected to the cylinder body (9) via bolts (15).

8. The high temperature external pressure collapse test device for petroleum pipes according to claim 1, characterized in that: The testing device (1) is arranged inside the protection device (16), and a mounting seat for mounting the testing device (1) is arranged inside the protection device (16).

9. The high temperature external pressure collapse test device for petroleum pipes according to claim 1, characterized in that: The sensor (5) is connected to the data acquisition system (3) via a transmission optical cable (7).

10. A high temperature external pressure collapse test method for petroleum pipes as claimed in claim 1, characterized in that: The following steps are involved: S1. Filling the interior of the oil pipe sample (20) with a temperature-resistant medium; S2. Injecting a medium into the annulus between the test device (1) and the oil pipe sample (20) through the liquid pressurizing device (2), and heating the medium in the annulus to 180° C. through the circulating heating device (4); S3. The medium in the annulus is continuously pressurized by the liquid pressurizing device (2), the pressure values ​​inside and outside the oil pipe sample (20) are collected by the sensor (5), and the pressure values ​​inside and outside the oil pipe sample (20) are transmitted to the data acquisition system (3) until the oil pipe sample (20) is crushed.

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