CN112304534B - Oil casing pipe simulation sealing test device and test method - Google Patents
Oil casing pipe simulation sealing test device and test method Download PDFInfo
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- CN112304534B CN112304534B CN202011043571.5A CN202011043571A CN112304534B CN 112304534 B CN112304534 B CN 112304534B CN 202011043571 A CN202011043571 A CN 202011043571A CN 112304534 B CN112304534 B CN 112304534B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2807—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
- G01M3/22—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
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Abstract
The invention belongs to the field of oil casing pipe test evaluation, and particularly discloses a device and a method for an oil casing pipe simulation sealing test, wherein the device comprises a loading system, a sealing surface simulation system, a gas injection system, a water injection system and a leak detection system; the loading system comprises an upper clamp and a lower clamp; the sealing surface simulation system comprises an upper convex seat, a lower concave seat and a sealing element, wherein the lower end of the upper convex seat is connected with a convex circle, the upper surface of the lower concave seat is provided with a groove, after the upper convex seat and the lower concave seat are assembled, the convex circle and the groove form an air cavity, the sealing element is sleeved on the outer circular surfaces of the upper convex seat and the lower concave seat, and the sealing element, the upper convex seat and the lower concave seat form an air cavity; the leak detection system comprises a flow meter; the upper clamp is connected with the upper end of the upper convex seat, and the lower clamp is connected with the lower end of the lower concave seat; the air cavity is communicated with a gas injection system, and the water cavity is communicated with a water injection system and a flowmeter. The flow meter is used for measuring the flow passing through, the leakage condition is simulated through the flow and the load applied by the loading system, and the judgment basis of the sealing leakage of the air-tight special threaded joint is formed.
Description
Technical Field
The invention belongs to the field of oil casing test evaluation, and particularly relates to a device and a method for testing simulated sealing of an oil casing.
Background
With the continuous deepening of natural gas exploration and development, the proportion of deep wells (well depth > 3000 m) and ultra-deep wells (well depth > 6000 m) in gas field development is continuously increased. The underground working environment of deep wells and ultra-deep wells is complex, and the conditions of high temperature (the bottom temperature is as high as 180 ℃), high pressure (the underground pressure is more than 80MPa) and high corrosion medium are faced, "three high", the traditional API oil casing pipe cannot meet the underground working condition requirement, and the non-API special threaded oil casing pipe joint with high air tightness is increasingly widely applied to the exploitation of high-temperature and high-pressure gas wells. Since the development of non-API joints in the 60's of the 20 th century by the american companies atlas and HYDR-LL, more than 100 special joints with patented technology have been developed worldwide, but among them, only more than 10 products in a few countries such as german, american, japanese, etc. are in common use.
Oil casing gas sealing buttons (special threaded joints) for oil field high temperature and high pressure gas wells need to be verified by a four-stage evaluation test specified by ISO 13679 or API RP 5C5 standards, but in view of the long cycle (around 3 months) and high cost (around 400 ten thousand yuan) of a physical evaluation test, physical evaluation for different sizes, wall thicknesses and steel grades of various gas sealing buttons is not practical. The generally accepted solution in the industry is to perform product certification by finite element calculation + part four-level test, and the appendix F of API RP 5C5 issued in 2017 also gives an operational guideline. The object test process adopts a leak detection device to judge the tightness of the joint, if the leak rate exceeds a threshold value (for example, 0.9 ml/15 min, according to ISO 13679: 2002(E)), the sample can be considered to have leakage failure, the judgment principle is clear, and the method is easy to implement. At present, when finite element calculation is carried out on an oil casing pipe air sealing buckle, although the sealing capability of the air sealing buckle is generally accepted in the industry to be determined by the size and the distribution condition of metal-to-metal contact stress, the metal sealing mechanism is complex, the influence factors are multiple, different sealing criteria are used by different manufacturers and third-party mechanisms, and no unified standard exists. The existing problems are represented by: the metal-to-metal sealing performance judgment formula lacks test data support, joint sealing performance evaluation lacks theoretical basis, sealing criterion lacks key influence parameters such as sealing surface roughness, and sealing performance evaluation related to keys in an airtight buckle finite element evaluation report does not have a unified standard, so that a series of sealing performance tests need to be developed.
All of the current sealing performance tests are full-scale tests according to standard evaluation tests for oil casings such as API RP 5C5 or ISO 13679. Because the full-scale test period is long (about 3 months for each group of tests), the test cost is high (about 400 ten thousand for each group of tests), and at least hundreds of groups of test data are required to support to establish a unified standard of sealing performance criteria. Thus, it is not possible to establish a uniform standard for sealing criteria using full-scale testing to obtain hundreds of sets of test data, often years and billions of time and hundreds of millions of expenses, which are impractical both in terms of time and expense.
Because the full-scale test period is long and the cost is high, a small-scale test needs to be developed to obtain a large amount of data required for establishing a sealing criterion, and at present, research on oil casing simulation sealing test devices and methods at home and abroad is still blank.
Disclosure of Invention
The invention aims to provide a device and a method for simulating sealing test of an oil casing pipe.
The invention is realized by the following technical scheme:
a kind of oil casing pipe simulation seal test device, including loading system, sealed surface simulation system, gas injection system, water injection system and leak hunting system;
the loading system comprises a base and a cross beam, wherein the cross beam is connected with an upper clamp, and the base is connected with a lower clamp;
the sealing surface simulation system comprises an upper convex seat, a lower concave seat and a sealing element, wherein the lower end of the upper convex seat is connected with a hollow convex circle which extends outwards, the upper surface of the lower concave seat is provided with a groove, after the upper convex seat and the lower concave seat are assembled, a cavity formed by the convex circle and the groove is an air cavity, the sealing element is sleeved on the outer circular surface of the upper convex seat and the lower concave seat, and a cavity formed by the sealing element, the upper convex seat and the lower concave seat is a water cavity;
the leak detection system comprises a flow meter;
the upper clamp is connected with the upper end of the upper convex seat, and the lower clamp is connected with the lower end of the lower concave seat;
an air injection hole, a water injection hole and a water outlet hole are formed in the upper convex seat, one end of the air injection hole is communicated with an air injection system, and the other end of the air injection hole is communicated with the air cavity; one end of the water injection hole is communicated with the water injection system, and the other end of the water injection hole is communicated with the water cavity; one end of the water outlet hole is communicated with the water cavity, and the other end of the water outlet hole is communicated with the flowmeter.
Furthermore, a positioning ring is arranged on the outer circular surface of the convex circle and used for limiting the distance of the convex circle part of the upper convex seat extending into the groove of the lower concave seat.
Furthermore, one side of the positioning ring is provided with a notch.
Further, the water injection system comprises a water supply source, a water injection valve and a water injection pipeline, the water injection valve is arranged on the water injection pipeline, one end of the water injection pipeline is connected with the water supply source, and the other end of the water injection pipeline is connected with a water injection hole.
Further, the gas injection system comprises a gas storage bottle, a gas injection pipeline and a supercharging device, the gas storage bottle is connected with the supercharging device through the gas injection pipeline, and the supercharging device is communicated with the gas injection hole through a pipeline.
Furthermore, the leakage detection system also comprises a measuring container, an adjustable bracket and a supporting seat, wherein the adjustable bracket is arranged on the supporting seat, and the measuring container is arranged on the adjustable bracket; the outside of the measuring container is carved with a scale, and the lower end of the measuring container is communicated with the flowmeter.
Further, a colorant is provided between the flow meter and the measuring vessel, and when water flows through the colorant, the water is colored.
Furthermore, the loading system adopts an electro-hydraulic servo material testing machine.
Furthermore, an upper sealing ring is arranged at the contact position of the sealing element and the lower end of the upper convex seat, and a lower sealing ring is arranged at the contact position of the sealing element and the upper end of the lower concave seat.
The invention discloses a sealing test method of an oil casing pipe simulated sealing test device, which comprises the following steps:
the method comprises the following steps: clamping the upper convex seat in the upper clamp and clamping the lower concave seat in the lower clamp;
step two, keeping the lower clamp still, moving the beam downwards, moving the upper convex seat downwards, and fixing the beam until the distance from the convex circle of the upper convex seat to the groove of the lower concave seat reaches a preset value;
driving the lower clamp to move upwards through the loading system, so that the bottom of the groove of the lower concave seat is contacted with the convex end part of the upper convex seat;
fourthly, wrapping sealing elements on the outer circular surfaces of the upper convex seat and the lower concave seat;
connecting the water injection system with the water injection hole, connecting the flow meter with the water outlet hole, and connecting the gas injection system with the gas injection hole;
injecting water into the water cavity through a water injection system until the water cavity is filled with water;
step seven, injecting gas into the gas cavity through a gas injection system and maintaining the pressure;
and step eight, applying a compression load through a loading system, driving the lower clamp to move upwards continuously, enabling the bottom surface of the groove to contact with the end surface of the convex circle to generate the compression load until the gas in the gas cavity leaks, and recording flow data in the flowmeter in unit time and the compression load when the gas leaks.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention discloses an oil casing pipe simulation sealing test device which comprises a loading system, a sealing surface simulation system, a gas injection system, a water injection system and a leakage detection system, wherein the main unit is the sealing surface simulation system, the sealing surface simulation system comprises an upper convex seat, a lower concave seat and a sealing element, the upper convex seat is clamped in an upper clamp of the loading system and used for simulating a sealing contact surface of an external thread, and the lower concave seat is clamped in a lower clamp of the loading system and used for simulating a sealing contact surface of an internal thread; the lower end of the upper convex seat is connected with a hollow convex circle which extends outwards, the upper surface of the lower concave seat is provided with a groove, the outer diameter D2 and the length H2 of the convex circle, the diameter D1 and the depth H1 of the groove in the lower concave seat can be processed and manufactured according to the width and the length of the sealing surface of the actually simulated airtight special thread, and the matching shape of the inner and outer sealing surfaces after the thread is buckled on the upper convex seat is simulated through the structure of the upper convex seat and the lower concave seat. The lower end of the upper convex seat is connected with a hollow convex circle which extends outwards, the upper surface of the lower concave seat is provided with a groove, after the upper convex seat and the lower concave seat are assembled, the cavity formed by the convex circle and the groove is an air cavity, the sealing element is sleeved on the outer circular surface of the upper convex seat and the lower concave seat, the cavity formed by the sealing element, the upper convex seat and the lower concave seat is a water cavity which is communicated with the water injection system and the leakage detection system, the air cavity is communicated with the gas injection system, when the gas in the gas cavity leaks, the gas can enter the water cavity, the leaked gas can drive the liquid water in the water cavity to enter the flowmeter, then the flow of the passing liquid water is automatically measured by the flowmeter, the leakage condition can be simulated by the flow and the load applied by the loading system, the judgment basis of the sealing leakage of the gas-sealing special threaded joint is formed, and technical support and tools can be provided for the selection of buttons and types of oil casings for the gas-sealing special threaded oil of the oil field.
Furthermore, a positioning ring is arranged on the outer circular surface of the convex circle and used for limiting the distance of the convex circle part of the upper convex seat extending into the groove of the lower concave seat so as to simulate the actual contact length of the sealing surface of the internal thread and the external thread.
Furthermore, the leak detection system also comprises a measurement container, an adjustable support and a support seat, wherein the measurement container is additionally arranged behind the flowmeter and mainly used for comparing with leakage data tested by the flowmeter, so that the measurement leakage loss or data distortion caused by flowmeter faults or inaccurate measurement is prevented, and the accuracy of the measurement data is also ensured.
Drawings
FIG. 1 is a schematic structural diagram of a simulated sealing test device for an oil casing pipe according to the present invention;
FIG. 2 is a schematic diagram of a seal face simulation system of the present invention;
FIG. 3 is a schematic structural view of the upper boss;
FIG. 4 is a top view of FIG. 3;
FIG. 5 is a schematic view of the structure of the lower recess;
FIG. 6 is a top view of FIG. 5;
FIG. 7 is a schematic view of a retaining ring.
Wherein: 1 is the epirelief seat, 2 is lower concave seat, 3 is the sealing member, 4 is the water cavity, 5 is the air cavity, 6 is last sealing washer, 7 is the lower sealing washer, 8 is last clamp, 9 is the lower clamp, 10 is the crossbeam, 11 is the stand, 12 is the base, 13 is the gas bomb, 14 is the gas injection pipeline, 15 is supercharging equipment, 16 is the outlet conduit, 17 is the flowmeter, 18 is the measuring vessel, 19 is the colorant, 20 is the supporting seat, 21 is adjustable support, 22 is the water injection valve, 23 is the water injection pipeline, 24 is the gas injection hole, 25 is the water injection hole, 26 is the apopore, 27 is the sealing contact surface, 28 is the holding ring.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
As shown in figure 1, the invention discloses a device for simulating and sealing an oil sleeve, which comprises a sealing surface simulation system, a loading system, a water injection system, a gas injection system and a leakage detection system.
An electro-hydraulic servo material testing machine is used as a loading system of the testing device, and the main components comprise an upper clamp 8, a lower clamp 9, a cross beam 10, an upright post 11 and a base 12. The upper clamp 8 is fixedly arranged on the cross beam 10 in a threaded mode and can move up and down along with the cross beam 10, the lower clamp 9 is connected with a hydraulic system in the base 12, and compressive load can be applied to the sealing surface simulation system through the lower clamp 9.
As shown in fig. 2, the sealing surface simulation system mainly comprises an upper convex seat 1 and a lower concave seat 2, wherein the upper convex seat 1 is clamped in an upper clamp 8 of the loading system and used for simulating the sealing contact surface of an external thread, and the lower concave seat 2 is clamped in a lower clamp 9 of the loading system and used for simulating the sealing contact surface of an internal thread; as shown in fig. 3 to 6, the lower end of the upper convex seat 1 is connected with a hollow convex circle which extends outwards, the upper surface of the lower concave seat 2 is provided with a groove, and the outer diameter D2 and the length H2 of the convex circle in the upper convex seat 1, the diameter D1 and the depth H1 of the groove in the lower concave seat 2 can be processed and manufactured according to the width and the length of the sealing surface of the actually simulated special air-tight sealing thread. The device is mainly used in the research and development stage of the special threads of the oil casing, the sealing test is carried out by simulating the size of the sealing surface, the design scheme is corrected by the sealing test result, and the actual product does not need to be measured.
As shown in fig. 3, the upper convex seat 1 is provided with a gas injection hole 24, a water injection hole 25 and a water outlet hole 26, the diameters of the water injection hole 25 and the water outlet hole 26 are 10mm, and the diameter of the gas injection hole 24 is 6 mm. After the upper convex seat 1 and the lower concave seat 2 are assembled in a combined mode under a certain axial load, the convex circular part of the upper convex seat and the circular hole part of the lower concave seat form an air cavity 5, and nitrogen injected from the gas injection hole 24 is filled in the air cavity. Meanwhile, the acrylic acid sealing piece 3 is wrapped by a circle along the outer edges of the upper convex seat and the lower concave seat, and the upper edge and the lower edge of the acrylic acid sealing piece are respectively fixed and sealed by an upper sealing ring 6 and a lower sealing ring 7, so that the acrylic acid sealing piece 3, the upper convex seat 1 and the lower concave seat 2 form a water cavity 4. A retaining ring 28 is fitted over the dome of the upper boss 1 prior to testing to limit the distance the dome portion of the upper boss 1 extends into the bore of the lower recess 2. When the upper convex seat 1 and the lower concave seat 2 are assembled, the contact part of the convex circle and the groove forms a sealing contact surface 27.
The upper sealing ring 6 and the lower sealing ring 7 are O-shaped sealing rings.
As shown in fig. 1, the water injection system is composed of a water injection valve 22 and a water injection pipeline 23, and water is injected into the water cavity 4 in the sealing surface simulation system through a water injection hole 25 in the upper convex seat.
As shown in fig. 1, the gas injection system is composed of a gas storage bottle 13, a gas injection pipeline 14 and a pressurizing device 15, and gas is injected into the gas cavity 5 in the sealing surface simulation system through a gas injection hole 24 on the upper convex seat. The pressurization device 15 is composed of 1 automatically controlled 140MPa nitrogen pressurization system, and provides high-pressure test gas for the sealing simulation system. The gas pressure can be remotely and automatically controlled by an upper computer, and the gas pressure is controlled through automatic pressure supplementing and pressure relief.
As shown in fig. 1, the leak detection system includes an outlet pipe 16, a flowmeter 17, a measuring container 18, a colorant 19, a support base 20, and an adjustable bracket 21, wherein the position of the measuring container 18 on the support base 20 is adjusted by the adjustable bracket 21, and the colorant is used for dyeing water entering the measuring container 18 to facilitate reading. After the gas in the air cavity 5 leaks, the gas can enter the water cavity 4 along the sealing contact surface, the leaked gas can drive the liquid water in the water cavity 4 to enter the water outlet pipeline 16 through the water outlet hole 26, then the liquid water finally enters the measuring container 18 through the high-precision micro-meter 17, the colored liquid level in the measuring container 18 rises, the leaked flow is read according to the change of scales in the measuring container 18, and meanwhile, the high-precision micro-meter 17 can also automatically measure the flow of the passed liquid water.
The flow meter 17 uses a high-precision micro flow meter.
As shown in fig. 7, a notch is formed on one side of the positioning ring 28, and the positioning ring 28 has a certain elasticity and is mounted on the protruding portion of the upper convex seat 1, because the positioning ring 28 and the upper convex seat are tightly fitted, the notch is used for enabling the positioning ring 28 to smoothly sleeve the upper convex seat 1.
The method for performing the sealing test through the device comprises the following steps:
step 1: the upper boss 1 is clamped in the upper clamp 8, the lower recess 2 is clamped in the lower clamp 9, and the positioning ring 28 is mounted in the upper boss 1 at the set position of the convex circle.
Step 2: and keeping the lower clamp 9 still, slowly moving the beam 11 downwards to enable the upper convex seat 1 to move downwards until the convex round part of the upper convex seat 1 is inserted into the groove of the lower concave seat 2 and reaches the position set by the positioning ring, and fixing the beam.
And step 3: setting an initial load of 100N in a loading system, driving the lower clamp 9 to move upwards through a hydraulic system, enabling the bottom of the groove of the lower concave seat 2 to be in contact with the convex round end part of the upper convex seat 1, and enabling the contact surface to generate certain contact pressure, so that the load is transmitted to the whole sealing surface simulation system, and the load is kept constant.
And 4, step 4: sheet-shaped acrylic sealing grease is wound along the upper edge of the upper convex seat 1 and the lower edge of the lower concave seat 2, and the upper edge and the lower edge are sealed by adopting two O-shaped sealing rings.
And 5: the water injection pipeline 23 is connected with the water injection hole 25 in the upper convex seat 1, the water outlet pipeline 16 is connected with the water outlet hole 26 in the upper convex seat 1, and the gas injection pipeline 14 is connected with the gas injection hole 24 in the upper convex seat.
Step 6: the water filling valve 22 is opened to fill water into the water cavity 4, the high-precision micrometer flow meter 17 is opened, and when the liquid level of the colorant in the measuring container 18 is observed to rise, the water filling valve 22 is closed, and the position of the liquid level of the colorant in the measuring container 18 is recorded.
And 7: the pressure of the gas to be charged is set in the pressurizing device 15, the valve of the gas cylinder 13 is opened, and nitrogen is injected into the gas chamber 5 through the gas injection pipeline 14 and pressure is maintained.
And 8: and applying a compressive load to the sealing surface simulation system through a loading system, and adopting displacement control. The lower clamp 9 is driven by a hydraulic system of the loading system to move upwards continuously at a certain speed, so that the bottom surface of the circular hole of the lower concave surface is contacted with the end surface of the convex circle of the upper convex seat continuously to generate a compression load, and the position basically reaches the position of the positioning ring 28 and stops until the gas in the gas cavity 5 leaks.
And step 9: the volume of the rise of the coloring liquid level in the container 18, the flow rate data in the flow meter 17, and the compression load at the time of the occurrence of the leak were measured per unit time (for example, 1 min).
In the oil casing thread, the sealing effect is mainly achieved by the sealing surface, and the thread only plays a role in bearing axial load, so that in the invention, a small-size sealing test is developed mainly according to the matching shape of the inner sealing surface and the outer sealing surface after the thread is buckled, the test period is short, only 1 day is needed, plug welding is not needed, the size of a sample and an air cavity formed by the sample are small, the pressurization and pressure relief, the loading and unloading time is short, the test cost is low (the test load is small, the maximum load is 15 tons), 1 person can complete the test, and the consumed labor force is low.
In order to obtain the influence of different influence factors on the leakage rate of the air-tight special threaded joint and simultaneously give consideration to efficiency and economy, the invention designs a test device and a test method to simulate the leakage condition of the air-tight special threaded joint under different influence factors. Different influence factors mainly refer to the influence of the outer diameter, the length, the surface roughness, the surface coating and the like of the actual thread sealing surface on the sealing performance of the sealing surface in the design and processing processes.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A sealing simulation test device for an oil casing pipe is characterized by comprising a loading system, a sealing surface simulation system, a gas injection system, a water injection system and a leakage detection system;
the loading system comprises a base (12) and a cross beam (10), wherein the cross beam (10) is connected with an upper clamp (8), and the base (12) is connected with a lower clamp (9);
the sealing surface simulation system comprises an upper convex seat (1), a lower concave seat (2) and a sealing element (3), wherein the lower end of the upper convex seat (1) is connected with a hollow convex circle which extends outwards, the upper surface of the lower concave seat (2) is provided with a groove, when the upper convex seat (1) and the lower concave seat (2) are assembled, a cavity formed by the convex circle and the groove is an air cavity (5), the sealing element (3) is sleeved on the outer circular surfaces of the upper convex seat (1) and the lower concave seat (2), and a cavity formed by the sealing element (3), the upper convex seat (1) and the lower concave seat (2) is a water cavity (4);
the leak detection system includes a flow meter (17);
the upper clamp (8) is connected with the upper end of the upper convex seat (1), and the lower clamp (9) is connected with the lower end of the lower concave seat (2);
an air injection hole (24), a water injection hole (25) and a water outlet hole (26) are formed in the upper convex seat (1), one end of the air injection hole (24) is communicated with an air injection system, and the other end of the air injection hole is communicated with the air cavity (5); one end of the water injection hole (25) is communicated with the water injection system, and the other end is communicated with the water cavity (4); one end of the water outlet hole (26) is communicated with the water cavity (4), and the other end is communicated with the flowmeter (17);
the upper convex seat (1) is used for simulating a sealing contact surface of an external thread, the lower concave seat (2) is used for simulating a sealing contact surface of an internal thread, and the matching shape of the inner and outer sealing surfaces after the thread is buckled up is simulated through the upper convex seat (1) and the lower concave seat (2).
2. The oil casing simulation sealing test device according to claim 1, wherein a positioning ring (28) is installed on the outer circumferential surface of the convex circle for limiting the distance that the convex circle part of the upper convex seat (1) extends into the groove of the lower concave seat (2).
3. The oil casing model sealing test device as claimed in claim 2, wherein one side of the positioning ring (28) is provided with a notch.
4. The oil casing model sealing test device according to claim 1, wherein the water injection system comprises a water supply source, a water injection valve (22) and a water injection pipeline (23), the water injection valve (22) is arranged on the water injection pipeline (23), one end of the water injection pipeline (23) is connected with the water supply source, and the other end of the water injection pipeline is connected with the water injection hole (25).
5. The oil casing simulation sealing test device according to claim 1, wherein the gas injection system comprises a gas storage bottle (13), a gas injection pipeline (14) and a pressurizing device (15), the gas storage bottle (13) is connected with the pressurizing device (15) through the gas injection pipeline (14), and the pressurizing device (15) is communicated with the gas injection hole (24) through a pipeline.
6. The oil casing model sealing test device as claimed in claim 1, wherein the leak detection system further comprises a measuring container (18), an adjustable bracket (21) and a supporting seat (20), the adjustable bracket (21) is mounted on the supporting seat (20), and the measuring container (18) is mounted on the adjustable bracket (21); the outside of the measuring container (18) is carved with a scale, and the lower end is communicated with the flowmeter (17).
7. The oil bushing model sealing test device according to claim 1, characterized in that a colorant (19) is further provided between the flow meter (17) and the measuring container (18), and when water flows through the colorant (19), the water is dyed.
8. The oil casing simulation sealing test device according to claim 1, wherein the loading system adopts an electro-hydraulic servo material testing machine.
9. The oil casing simulation sealing test device according to claim 1, wherein an upper sealing ring (6) is arranged at a contact position of the sealing element (3) and the lower end of the upper convex seat (1), and a lower sealing ring (7) is arranged at a contact position of the sealing element (3) and the upper end of the lower concave seat (2).
10. The seal test method of the oil casing pipe simulated seal test apparatus as claimed in any of claims 1 to 9, characterized by comprising the steps of:
the method comprises the following steps: the upper convex seat (1) is clamped in an upper clamp (8), and the lower concave seat (2) is clamped in a lower clamp (9);
step two, keeping the lower clamp (9) stationary, moving the beam (10) downwards, moving the upper convex seat (1) downwards, and fixing the beam (10) until the distance from the convex circle of the upper convex seat (1) to the groove of the lower concave seat (2) reaches a preset value;
driving the lower clamp (9) to move upwards through a loading system, so that the bottom of the groove of the lower concave seat (2) is contacted with the convex end part of the upper convex seat (1);
fourthly, wrapping sealing elements (3) on the outer circular surfaces of the upper convex seat (1) and the lower concave seat (2);
connecting a water injection system with a water injection hole (25), connecting a flowmeter (17) with a water outlet hole (26), and connecting a gas injection system with a gas injection hole (24);
injecting water into the water cavity (4) through a water injection system until the water cavity (4) is filled with water;
step seven, injecting gas into the gas cavity (5) through a gas injection system and maintaining the pressure;
and step eight, applying a compression load through a loading system, driving the lower clamp (9) to move upwards continuously, enabling the bottom surface of the groove to contact with the end surface of the convex circle to generate the compression load until the gas in the air cavity (5) leaks, and recording flow data in the flowmeter (17) in unit time and the compression load when the gas leaks.
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| CN115791020A (en) * | 2022-11-29 | 2023-03-14 | 浙江岷泰科技有限公司 | Internal leakage detection equipment and detection method based on support |
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| CN102455244B (en) * | 2010-11-01 | 2014-04-02 | 中国石油天然气集团公司 | Oil sleeve joint sealing and detecting device |
| CN204788849U (en) * | 2015-06-03 | 2015-11-18 | 西南石油大学 | Outer detection device of casing thread leakproofness |
| CN206370233U (en) * | 2016-11-14 | 2017-08-01 | 中广核核电运营有限公司 | Nuclear grade valve seals skills training device |
| CN106969888B (en) * | 2017-05-11 | 2023-07-21 | 浙江天泰机械有限公司 | Engine leakage testing device and engine leakage testing system |
| CN207280702U (en) * | 2017-09-06 | 2018-04-27 | 重庆科技学院 | A kind of experimental provision of follow-on test special thread sealing surface released gas rate |
| CN207280680U (en) * | 2017-09-07 | 2018-04-27 | 重庆科技学院 | A kind of device for testing special thread sealing surface high temperature contact stress relaxation |
| CN107478386B (en) * | 2017-09-07 | 2023-10-20 | 重庆科技学院 | Method for testing high-temperature contact stress relaxation of special thread sealing surface |
| CN109900441A (en) * | 2017-12-11 | 2019-06-18 | 中国石油大学(华东) | A kind of experimental rig and test method for testing non-API casing adapter air-tightness |
| CN111487020A (en) * | 2020-04-24 | 2020-08-04 | 中国石油天然气集团有限公司 | Coal underground gasification pipe column integrity simulation test device and test method |
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