Production equipment for acid-resistant low-carbon alloy coiled tubing with different steel grades

Abstract

The utility model relates to the field of petroleum engineering, in particular to production equipment for acid-resistant low-carbon alloy coiled tubing with different steel grades, which mainly comprises cleaning equipment, tubing continuous processing equipment, simulated normalizing equipment, spray cooling equipment, tempering treatment equipment and air cooling equipment which are sequentially arranged. According to the continuous oil pipe machined through the continuous oil pipe machining device, the corrosion resistance and the mechanical property of the acid-resistant continuous oil pipe can be achieved at the same time, and acid-resistant continuous oil pipes of different steel grades can be produced under the condition that the proportion of alloy elements is not changed.

Description

TECHNICAL FIELD

[0001] The utility model relates to petroleum engineering field especially relates to the production equipment of acid -resistant low carbon alloy coiled tubing of different steel grade. BACKGROUND

[0002] In the acid environment, the corrosion resistance of conventional coiled tubing is insufficient, and problems such as stress corrosion cracking and hydrogen-induced cracking are prone to occur. The current existing coiled tubing material is mostly medium carbon or low carbon alloy steel, which performs excellently in high strength and wear resistance, but has poor corrosion resistance in acid environment. The steel grade of coiled tubing material that meets the chemical composition requirements of industry standards and has corrosion resistance and high steel grade cannot appear simultaneously, so in order to improve acid resistance, an external anticorrosive coating or internal coating method is usually used, but this increases the cost and complexity, and the long-term stability of the coating also has problems. In addition, different operating environments have different requirements for steel strength and toughness, and a single material cannot meet the diversified needs. SUMMARY

[0003] Based on the above problems, the purpose of the utility model is to provide a production equipment of acid -resistant low carbon alloy coiled tubing of different steel grade, the utility model adopts the following technical scheme:

[0004] The utility model provides a production equipment of acid -resistant low carbon alloy coiled tubing of different steel grade, the production equipment includes the cleaning equipment, the oil pipe continuous processing equipment, the simulation normalizing equipment, the spray cooling equipment, the tempering treatment equipment, air cooling equipment arranged in sequence;

[0005] The simulation normalizing equipment includes normalizing induction heating coil and induction heating device, and the induction head of the induction heating device is opposite to the weld of the coiled tubing;

[0006] The spray cooling equipment includes circulating water tank and air blowing nozzle, the circulating water tank is arranged below the coiled tubing, two spray heads are arranged above the circulating water tank, and the spray heads are connected with the circulating water tank through the water supply system; The air blowing nozzle is located behind the circulating water tank and is connected with the gas supply equipment.

[0007] Preferably, the tempering treatment equipment includes tempering induction heating coil and heat preservation induction heating coil arranged in sequence.

[0008] Preferably, the number of the tempering induction heating coil is three, the number of the heat preservation induction heating coil is one, and the heat preservation induction heating coil is located behind the last tempering induction heating coil.

[0009] Preferably, the air cooling device comprises two air coolers, the two air coolers are connected through an air pump, and the rear air cooler is connected with the air cooling nozzle through a pipeline.

[0010] Preferably, the cleaning device is an ultrasonic cleaning device.

[0011] Compared with the prior art, the beneficial technical effects of the utility model are as follows:

[0012] The continuous oil pipe processed by the utility model can have corrosion resistance and mechanical properties of the acid-resistant continuous oil pipe, and can produce acid-resistant continuous oil pipes of different steel grades without changing the proportion of alloy elements. BRIEF DESCRIPTION OF DRAWINGS

[0013] The utility model will be further described below in combination with the drawings.

[0014] Figure 1 The production process flow chart of the acid-resistant low-carbon alloy continuous oil pipe of different steel grades in the embodiment is shown in the figure.

[0015] Figure 2 The production equipment layout of the acid-resistant low-carbon alloy continuous oil pipe of different steel grades in the embodiment is shown in the figure.

[0016] Figure 3 The structure diagram of the simulated normalizing equipment in the embodiment is shown in the figure.

[0017] Figure 4 The structure diagram of the spray cooling equipment in the embodiment is shown in the figure.

[0018] Figure 5 The structure diagram of the tempering treatment equipment in the embodiment is shown in the figure.

[0019] Figure 6 The structure diagram of the air cooling equipment in the embodiment is shown in the figure.

[0020] Reference signs: 1, cleaning device; 2, continuous oil pipe processing equipment; 3, simulated normalizing equipment; 301, normalizing induction heating coil; 302, induction heating device; 4, spray cooling equipment; 401, circulating water tank; 402, air blowing nozzle; 403, spray head; 5, tempering treatment equipment; 501, tempering induction heating coil; 502, heat preservation induction heating coil; 6, air cooling equipment; 601, air cooler; 602, air pump; 603, air cooling nozzle. DETAILED DESCRIPTION

[0021] In order to make the technical problems, technical solutions and beneficial effects of the utility model clearer, the utility model will be further described in detail below in combination with the drawings and embodiments.

[0022] AsFigure 1 As shown, this embodiment discloses a production process for acid-resistant low-carbon alloy coiled tubing of different steel grades, which includes the following steps:

[0023] Step 1: Cleaning: The acid-resistant alloy steel strip is surface cleaned using a combination of ultrasonic and organic solvent degreasing. The organic solvent is a mixture of trichloroethylene, acetone, and a thickener, with the trichloroethylene content being 65% by weight, the acetone content being 25% by weight, and the remainder being the thickener. The acid-resistant alloy steel strip is made of carbon low-alloy steel.

[0024] Step 2: Processing and forming of the coiled tubing: Processing the acid-resistant alloy steel strip into the coiled tubing.

[0025] Step 3: Primary Heat Treatment: The coiled tubing undergoes simulated normalizing at 890°C to 960°C, followed by immediate spray cooling to 15°C to 35°C. Simulated normalizing dissolves carbides in the steel and refines the grain size. It's important to note that in heat treatment, normalizing is defined as cooling in still air. However, during coiled tubing production, the product is constantly in motion through air, hence the name "simulated normalizing."

[0026] Step 4: Secondary heat treatment: The coiled tubing is tempered at a temperature between 500°C and 750°C. This process eliminates stress in the tubing and generates tempered sorbite, giving the tubing improved strength, hardness, and toughness. It also prevents diameter inconsistencies and length variations that can occur with prolonged heating, ensuring uniform outer diameter and extending the service life of the tubing.

[0027] Step 5: Air cooling: pre-cool the air to 15-25°C and then cool the coiled tubing to 25-30°C.

[0028] For example, when the tempering temperature is controlled at 580°C, the coiled tubing produced is CT100 steel grade; when the tempering temperature is controlled at 680°C, the coiled tubing produced is CT90 steel grade; and when the tempering temperature is controlled at 750°C, the coiled tubing produced is CT80 steel grade (the same normalizing temperature is used for the above three steel grades, and the temperature of the coiled tubing after spray cooling is specifically 22-25°C; the temperature of the coiled tubing after air cooling is 25-30°C).

[0029] like Figures 2 to 6As shown, the present embodiment also discloses a production equipment of acid-resistant low-carbon alloy continuous tubing of different steel grades, which is used in the production process. The production equipment comprises a cleaning equipment 1, a tubing continuous processing equipment 2, a simulated normalizing equipment 3, a spraying cooling equipment 4, a tempering treatment equipment 5 and an air cooling equipment 6 arranged in sequence. The cleaning equipment 1 is an ultrasonic cleaning. The tubing continuous processing equipment 2 mainly comprises a steel pipe preliminary forming equipment, an optical fiber winding equipment, a laser welding equipment, a non-destructive testing equipment and a steel pipe drawing equipment, a traction equipment. The cleaning equipment 1 and the tubing continuous processing equipment 2 belong to the prior art, and their structures are not described herein.

[0030] The simulated normalizing equipment 3 comprises a normalizing induction heating coil 301 and an induction heating device 302. The normalizing induction heating coil 301 is located at the front of the induction heating device 302, and the induction head of the induction heating device 302 is opposite to the weld of the continuous tubing.

[0031] The spraying cooling equipment 4 uses a double-circulation cooling device to ensure the cooling effect. The spraying cooling equipment 4 comprises a circulating water tank 401 and a blowing nozzle 402. The circulating water tank 401 is arranged below the continuous tubing, and two spraying heads 403 are arranged above the circulating water tank 401. The spraying heads 403 are connected with the circulating water tank 401 through a water supply system, which generally comprises a water pump and pipeline components. The blowing nozzle 402 is located behind the circulating water tank 401 and is connected with a gas supply equipment. The production pipeline is blown by the blowing nozzle 402 to remove water droplets on the surface of the pipeline after spraying cooling.

[0032] The tempering treatment equipment 5 comprises a tempering induction heating coil 501 and a heat preservation induction heating coil 502 arranged in sequence according to the production direction. The number of the tempering induction heating coil 501 is three, and the number of the heat preservation induction heating coil 502 is one. The heat preservation induction heating coil 502 is located behind the last tempering induction heating coil 501.

[0033] The air cooling equipment 6 compresses air to be pre-cooled to 15-25℃, and then the air flow is blown out through an adjusting valve and a nozzle for cooling. Compared with the conventional air cooling, the cooling rate and the cooling time can be more stably controlled. Specifically, the air cooling equipment 6 comprises two air coolers 601, and the air interface between the two air coolers 601 is connected through an air pump 602. The air cooler 601 located in front plays a pre-cooling role on the air. The air cooler 601 in front utilizes water as a cooling medium, and the air cooler 601 located in rear utilizes compressed nitrogen as a cooling medium. The air cooler 601 located in rear is connected with a blowing cooling nozzle 603 through a pipeline.

[0034] It should be noted that the structure and principle of the air cooler 601 are the same as those of a heat exchanger. The temperature of the air is reduced by heat exchange between the cooling medium and the air.

[0035] The above-described embodiments are merely preferred modes of the present application, and are not intended to limit the scope of the present application, and various modifications and improvements to the technical solutions of the present application made by those of ordinary skill in the art without departing from the design spirit of the present application shall fall within the protection scope of the present application as defined by the claims.

Claims

1. A production equipment for acid-resistant low-carbon alloy coiled tubing of different steel grades, characterized by: The production equipment includes a cleaning device (1), an oil pipe continuous processing device (2), a simulated normalizing device (3), a spray cooling device (4), a tempering treatment device (5), and an air cooling device (6) which are arranged in sequence; The simulated normalizing equipment (3) comprises a normalizing induction heating coil (301) and an induction heating device (302), wherein the induction head of the induction heating device (302) is directly opposite to the weld of the coiled tubing; The spray cooling device (4) comprises a circulating water tank (401) and an air blowing nozzle (402). The circulating water tank (401) is arranged below the coiled oil pipe. Two spray heads (403) are arranged above the circulating water tank (401). The spray heads (403) are connected to the circulating water tank (401) through a water supply system. The air blowing nozzle (402) is located behind the circulating water tank (401) and is connected to the air supply device.

2. The production equipment for acid-resistant low-carbon alloy coiled tubing of different steel grades according to claim 1 is characterized by: The tempering treatment equipment (5) comprises a tempering induction heating coil (501) and a heat preservation induction heating coil (502) arranged in sequence.

3. The production equipment for acid-resistant low-carbon alloy coiled tubing of different steel grades according to claim 2, characterized in that: The number of the tempering induction heating coils (501) is three, the number of the heat-insulating induction heating coil (502) is one, and the heat-insulating induction heating coil (502) is located behind the last tempering induction heating coil (501).

4. The production equipment of acid-resistant low-carbon alloy coiled tubing of different steel grades according to claim 1 is characterized by: The air cooling device (6) includes two air coolers (601), the two air coolers (601) are connected via an air pump (602), and the air cooler (601) located at the rear is connected to a cooling nozzle (603) via a pipeline.

5. The production equipment of acid-resistant low-carbon alloy coiled tubing of different steel grades according to claim 1 is characterized by: The cleaning equipment (1) is ultrasonic cleaning.

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