CN113702198A - Hydrostatic pressure test method for coiled tubing - Google Patents
Hydrostatic pressure test method for coiled tubing Download PDFInfo
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- CN113702198A CN113702198A CN202111281453.2A CN202111281453A CN113702198A CN 113702198 A CN113702198 A CN 113702198A CN 202111281453 A CN202111281453 A CN 202111281453A CN 113702198 A CN113702198 A CN 113702198A
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- coiled tubing
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- hydrostatic pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to the technical field of coiled tubing manufacturing, and particularly provides a coiled tubing hydrostatic pressure test method, which comprises the steps of connecting a pipeline of a coiled tubing hydrostatic pressure test system, opening a pre-filling valve, and closing a plunger valve and a nitrogen making valve for pre-filling; the port of the coiled tubing, which is injected into the circulating water pool, is not exhausted, and the filling pump, the pre-filling valve and the coiled tubing exhaust pipeline valve are closed; opening the plunger valve and starting the plunger pump to finish the hydrostatic pressure test; opening a continuous oil pipe emptying pipeline valve, closing a plunger valve, opening a nitrogen making valve, putting a pigging ball, starting nitrogen equipment to empty liquid in the pipe until the inner pipe wall is blown and dried, and plugging nitrogen in the pipe by using a union seal pipe at two ends of the continuous oil pipe through a protection wire; the invention realizes the integration of operations such as hydrostatic pressure test of the continuous oil pipe, liquid evacuation in the pipe, blow-drying of the inner pipe wall, nitrogen filling in the pipe and corrosion prevention, and has the advantages of smooth and reasonable production process, small occupied area, high production efficiency, low production cost, high automation degree and safer operation.
Description
Technical Field
The invention relates to the technical field of coiled tubing manufacturing, in particular to a hydrostatic pressure testing method for coiled tubing.
Background
The coiled tubing is a novel oil-gas tubing with a single thread joint with a length of thousands of meters, has high strength, high plasticity and certain corrosion resistance, and can be wound on a roller for oilfield field operation. The continuous pipe operation has the unique advantages of high operation efficiency, less stratum damage, small occupied area, reusability and the like, and is widely applied in the world.
The hydrostatic pressure test of the coiled tubing is a test process which is carried out according to standard requirements after the manufacturing process of the coiled tubing is finished. The coiled tubing manufacturing process comprises purchasing hot rolled steel coils from a steel mill, and then longitudinally shearing the hot rolled steel coils to obtain steel strips with required width and thickness. And then, carrying out shearing butt welding on the steel strips to obtain long steel strips with required lengths, and coiling the long steel strips on a large steel strip reel. And moving the large steel strip reel to a continuous oil pipe forming production line, performing cold bending forming and high-frequency welding on the steel strip, performing appropriate heat treatment and nondestructive inspection, and then reeling the steel strip onto a continuous oil pipe reel. And sending the coiled tubing on the coiled tubing reel into a coiled tubing rewinding production line for rewinding and detecting, and after the coiled tubing is rewound, conveying the coiled tubing to a hydrostatic pressure testing area of the coiled tubing for hydrostatic pressure testing.
The conventional hydrostatic pressure test process for the coiled tubing is complex, large in occupied area, low in production efficiency, high in production cost, low in automation degree and free of guarantee on operation safety.
Disclosure of Invention
The invention aims to provide a hydrostatic pressure test method for a coiled tubing to overcome the defects in the prior art.
The new technical scheme of the invention is as follows: a hydrostatic pressure test method for a coiled tubing comprises a filling pump, a pre-filling valve, a plunger pump, a plunger valve, a roller, the coiled tubing, a circulating water tank, nitrogen making equipment, a nitrogen making valve and a control system, wherein the filling pump is connected with the pre-filling valve, the plunger pump is connected with the plunger valve, the nitrogen making equipment is connected with the nitrogen making valve, the filling pump is connected with the plunger pump in parallel, the filling pump and the plunger pump are connected with the nitrogen making equipment in parallel, the filling pump, the plunger pump and the nitrogen making equipment are connected with the roller through pipelines, and the roller is connected with the circulating water tank through the coiled tubing; the filling pump, the plunger pump and the nitrogen making equipment are connected with a control system; the hydrostatic pressure test method of the coiled tubing comprises the steps of coiled tubing pre-filling, pressurizing test, coiled tubing emptying, coiled tubing inner pipe wall drying and coiled tubing nitrogen filling for corrosion prevention, and comprises the following steps: 1) pre-filling a continuous oil pipe: connecting a pipeline of the coiled tubing hydrostatic pressure test system, the front end of the coiled tubing to be tested, the tail end of the coiled tubing to be tested and a pipeline of the circulating water tank; opening a pre-filling valve, closing a plunger valve and a nitrogen making valve, and pre-filling the coiled tubing to be tested; 2) and (3) pressurizing test: observing that no air is discharged from the port of the coiled tubing which is injected into the circulating water pool, and closing the filling pump, the pre-filling valve and the coiled tubing discharge pipeline valve; opening a plunger valve, starting a plunger pump for a pressurization test, completing a hydrostatic pressure test according to preset test pressure and test time, and printing a hydrostatic pressure test report; 3) emptying the continuous oil pipe: after hydrostatic pressure testing and pressure testing are completed, opening a coiled tubing emptying pipeline valve, closing a plunger valve, opening a nitrogen making valve, putting a pigging ball, and starting nitrogen equipment to empty liquid in the coiled tubing; 4) drying the inner pipe wall of the continuous oil pipe: after the liquid in the coiled tubing is emptied, the nitrogen equipment continues to inject nitrogen into the coiled tubing until the inner tube wall is blown and dried; 5) filling nitrogen into the continuous oil pipe for corrosion prevention: and after the wall of the continuous oil pipe is dried, sealing the oil joints at the two ends of the continuous oil pipe by using a protection wire, and sealing nitrogen in the continuous oil pipe.
The nitrogen equipment in the step 4) adopts PSA pressure swing adsorption nitrogen equipment.
The wire protector in the step 5) is of a DRILLTEC buckle type.
The filling pump is a low-pressure filling pump.
The plunger pump is a high-pressure plunger pump.
The pre-filling valve, the plunger valve and the nitrogen making valve are remote control valves.
The invention has the following beneficial effects: the invention realizes the integration of operations such as hydrostatic pressure test of the continuous oil pipe, liquid evacuation in the pipe, blow-drying of the inner pipe wall, nitrogen filling in the pipe and corrosion prevention, and has the advantages of smooth and reasonable production process, small occupied area, high production efficiency, low production cost, high automation degree and safer operation.
Drawings
Fig. 1 is a schematic view of the connection structure of the present invention.
Wherein: 1. filling pump, 2, prefill valve, 3, roller, 4, coiled tubing, 5, circulating water tank, 6, nitrogen making valve, 7, plunger valve, 8, nitrogen making equipment, 9, plunger pump, 10 and control system.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
A hydrostatic pressure test method for a coiled tubing comprises a filling pump 1, a pre-filling valve 2, a plunger pump 9, a plunger valve 7, a roller 3, the coiled tubing 4, a circulating water tank 5, a nitrogen making device 8, a nitrogen making valve 6 and a control system 10, wherein the filling pump 1 is connected with the pre-filling valve 2, the plunger pump 9 is connected with the plunger valve 7, the nitrogen making device 8 is connected with the nitrogen making valve 6, the filling pump 1 is connected with the plunger pump 9 in parallel, the filling pump 1 and the plunger pump 9 are connected with the nitrogen making device 8 in parallel, the filling pump 1, the plunger pump 9 and the nitrogen making device 8 are connected with the roller 3 through pipelines, and the roller 3 is connected with the circulating water tank 5 through the coiled tubing 4; the filling pump 1, the plunger pump 9 and the nitrogen making equipment 8 are connected with a control system 10; the hydrostatic pressure test method of the coiled tubing comprises the steps of coiled tubing pre-filling, pressurizing test, coiled tubing emptying, coiled tubing inner pipe wall drying and coiled tubing nitrogen filling for corrosion prevention, and comprises the following steps: 1) pre-filling a continuous oil pipe: connecting a pipeline of the coiled tubing hydrostatic pressure test system, the front end of the coiled tubing to be tested, the tail end of the coiled tubing to be tested and a pipeline of the circulating water tank 5; opening the pre-filling valve 2, closing the plunger valve 7 and the nitrogen making valve 6, and pre-filling the coiled tubing to be tested; 2) and (3) pressurizing test: observing that no air is discharged from the port of the continuous oil pipe 4 injected into the circulating water pool 5, and closing the filling pump 1, the pre-filling valve 2 and the discharge pipeline valve of the continuous oil pipe 4; opening the plunger valve 7, starting the plunger pump 9 for pressurization test, completing hydrostatic pressure test according to preset test pressure and test time, and printing a hydrostatic pressure test report; 3) emptying the continuous oil pipe 4: after hydrostatic pressure testing and pressure testing are completed, opening a pipeline emptying valve of the continuous oil pipe 4, closing a plunger valve 7, opening a nitrogen making valve 6, putting a pigging ball, and starting nitrogen equipment to empty liquid in the continuous oil pipe 4; 4) drying the inner pipe wall of the continuous oil pipe 4: after the liquid in the coiled tubing 4 is emptied, the nitrogen equipment continues to inject nitrogen into the coiled tubing 4 until the inner tube wall is blown and dried; 5) and (3) filling nitrogen into the continuous oil pipe 4 for corrosion prevention: and after the wall of the continuous oil pipe 4 is dried, sealing the union joints at the two ends of the continuous oil pipe 4 by using a protection wire, and sealing nitrogen in the pipe of the continuous oil pipe 4.
The nitrogen equipment in the step 4) adopts PSA pressure swing adsorption nitrogen equipment.
The wire protector in the step 5) is of a DRILLTEC buckle type.
The filling pump 1 is a low-pressure filling pump.
The plunger pump 9 is a high-pressure plunger pump.
The pre-filling valve 2, the plunger valve 7 and the nitrogen making valve 6 are remote control valves.
The coiled tubing hydrostatic pressure test method integrates the processes of coiled tubing hydrostatic pressure test, liquid evacuation in the coiled tubing 4 and blow-drying of the inner wall of the coiled tubing 4, so that the process is smoother, the whole system occupies smaller area, the operation time is shorter, and the production time and the cost are saved.
Having separate pre-fill and pressurization test systems allows for shorter overall operating times and greater efficiencies.
The remote control and automatic data acquisition functions are achieved, so that the whole system has the automation performance and the operation is safer.
The nitrogen equipment adopts PSA pressure swing adsorption nitrogen equipment, the equipment cost investment is low, the purity of the produced nitrogen is high, and the nitrogen filling corrosion prevention of the continuous oil pipe 4 is facilitated.
And after the nitrogen filling is finished, sealing and plugging are carried out on the union at the two ends of the continuous oil pipe 4 by adopting DRILLTEC buckle type protective wires.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (6)
1. The device comprises a filling pump, a pre-filling valve, a plunger pump, a plunger valve, a roller, the coiled tubing, a circulating water tank, nitrogen production equipment, a nitrogen production valve and a control system, and is characterized in that: the filling pump is connected with the pre-filling valve, the plunger pump is connected with the plunger valve, the nitrogen making equipment is connected with the nitrogen making valve, the filling pump is connected with the plunger pump in parallel, the filling pump and the plunger pump are connected with the nitrogen making equipment in parallel, the filling pump, the plunger pump and the nitrogen making equipment are connected with the roller through pipelines, and the roller is connected with a circulating water tank through a continuous oil pipe; the filling pump, the plunger pump and the nitrogen making equipment are connected with a control system; the hydrostatic pressure test method of the coiled tubing comprises the steps of coiled tubing pre-filling, pressurizing test, coiled tubing emptying, coiled tubing inner pipe wall drying and coiled tubing nitrogen filling for corrosion prevention, and comprises the following steps: 1) pre-filling a continuous oil pipe: connecting a pipeline of the coiled tubing hydrostatic pressure test system, the front end of the coiled tubing to be tested, the tail end of the coiled tubing to be tested and a pipeline of the circulating water tank; opening a pre-filling valve, closing a plunger valve and a nitrogen making valve, and pre-filling the coiled tubing to be tested; 2) and (3) pressurizing test: observing that no air is discharged from the port of the coiled tubing which is injected into the circulating water pool, and closing the filling pump, the pre-filling valve and the coiled tubing discharge pipeline valve; opening a plunger valve, starting a plunger pump for a pressurization test, completing a hydrostatic pressure test according to preset test pressure and test time, and printing a hydrostatic pressure test report; 3) emptying the continuous oil pipe: after hydrostatic pressure testing and pressure testing are completed, opening a coiled tubing emptying pipeline valve, closing a plunger valve, opening a nitrogen making valve, putting a pigging ball, and starting nitrogen equipment to empty liquid in the coiled tubing; 4) drying the inner pipe wall of the continuous oil pipe: after the liquid in the coiled tubing is emptied, the nitrogen equipment continues to inject nitrogen into the coiled tubing until the inner tube wall is blown and dried; 5) filling nitrogen into the continuous oil pipe for corrosion prevention: and after the wall of the continuous oil pipe is dried, sealing the oil joints at the two ends of the continuous oil pipe by using a protection wire, and sealing nitrogen in the continuous oil pipe.
2. The coiled tubing hydrostatic pressure test method according to claim 1, characterized in that: the nitrogen equipment in the step 4) adopts PSA pressure swing adsorption nitrogen equipment.
3. The coiled tubing hydrostatic pressure test method according to claim 1, characterized in that: the wire protector in the step 5) is of a DRILLTEC buckle type.
4. The coiled tubing hydrostatic pressure test method according to claim 1, characterized in that: the filling pump is a low-pressure filling pump.
5. The coiled tubing hydrostatic pressure test method according to claim 1, characterized in that: the plunger pump is a high-pressure plunger pump.
6. The coiled tubing hydrostatic pressure test method according to claim 1, characterized in that: the pre-filling valve, the plunger valve and the nitrogen making valve are remote control valves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111281453.2A CN113702198A (en) | 2021-11-01 | 2021-11-01 | Hydrostatic pressure test method for coiled tubing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111281453.2A CN113702198A (en) | 2021-11-01 | 2021-11-01 | Hydrostatic pressure test method for coiled tubing |
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| Publication Number | Publication Date |
|---|---|
| CN113702198A true CN113702198A (en) | 2021-11-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111281453.2A Pending CN113702198A (en) | 2021-11-01 | 2021-11-01 | Hydrostatic pressure test method for coiled tubing |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114776259A (en) * | 2022-05-25 | 2022-07-22 | 山东宏丰智能装备有限公司 | Integrated corrosion prevention system for inner pipe wall of continuous oil pipe |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050241677A1 (en) * | 2004-05-03 | 2005-11-03 | The Boeing Company | Combined pressure test and clean apparatus |
| CN102042935A (en) * | 2010-10-29 | 2011-05-04 | 马利芳 | Method for detecting hydrostatic pressure of thin-wall steel pipe under end face seal condition |
| CN205808817U (en) * | 2016-07-15 | 2016-12-14 | 陕西优润安石油科技有限公司 | A kind of pressue device for oil pipe pressure test |
| CN109297828A (en) * | 2018-10-24 | 2019-02-01 | 中国科学院上海硅酸盐研究所 | Thin-walled silicon carbide ceramic hydrostatic pressure detection method |
| CN211042924U (en) * | 2019-11-12 | 2020-07-17 | 湖南佰力流体科技有限公司 | Pressure resistance test system for large container |
-
2021
- 2021-11-01 CN CN202111281453.2A patent/CN113702198A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050241677A1 (en) * | 2004-05-03 | 2005-11-03 | The Boeing Company | Combined pressure test and clean apparatus |
| CN102042935A (en) * | 2010-10-29 | 2011-05-04 | 马利芳 | Method for detecting hydrostatic pressure of thin-wall steel pipe under end face seal condition |
| CN205808817U (en) * | 2016-07-15 | 2016-12-14 | 陕西优润安石油科技有限公司 | A kind of pressue device for oil pipe pressure test |
| CN109297828A (en) * | 2018-10-24 | 2019-02-01 | 中国科学院上海硅酸盐研究所 | Thin-walled silicon carbide ceramic hydrostatic pressure detection method |
| CN211042924U (en) * | 2019-11-12 | 2020-07-17 | 湖南佰力流体科技有限公司 | Pressure resistance test system for large container |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114776259A (en) * | 2022-05-25 | 2022-07-22 | 山东宏丰智能装备有限公司 | Integrated corrosion prevention system for inner pipe wall of continuous oil pipe |
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Application publication date: 20211126 |
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