A coiled tubing with thermal insulation, heat preservation and testing integrated

Abstract

The present invention discloses an integrated continuous oil pipe for heat insulation, thermal insulation and testing, comprising an inner pipe and an outer pipe, wherein the inner pipe is nested in the outer pipe, and an annulus is formed between the inner pipe and the outer pipe; the outer wall of the inner pipe is wrapped with an aluminum foil reflective layer, a first SiC aerogel thermal insulation layer and a second SiC aerogel thermal insulation layer in sequence from the inside to the outside; a pressure measuring tube, a temperature measuring tube and a conduit are arranged in the annulus, and sealing plugs are arranged at the ends of the pressure measuring tube, the temperature measuring tube and the conduit, and a sealed chamber is formed between the sealing plug, the inner pipe and the outer pipe, and an opening connected to the chamber is arranged on the inner pipe, and a check valve is arranged at the opening. The integrated continuous oil pipe for heat insulation, thermal insulation and testing of the present invention can monitor the changes of the temperature field and pressure field inside and outside the insulated oil pipe in real time; it can achieve maximum thermal insulation and reduce heat loss along the way. The present invention has the advantages of high operating efficiency and high thermal insulation level, solves the problem of monitoring the temperature and pressure of downhole fluids during steam injection and production, and can meet the needs of special operations in oil fields.

Description

Technical Field

[0001] The invention relates to a heat-insulating, thermal-retaining and testing integrated coiled oil pipe, and relates to the technical fields of oil production, steam injection, testing and operation in oil fields. Background Art

[0002] In the process of oil production, it is generally necessary to inject high-temperature hot fluid into the well to achieve the purpose of heating the oil layer, cleaning the sand control pipe, unblocking the oil layer, and cleaning the pipe column. Traditionally, ordinary insulated oil pipes (such as the Chinese invention patent application with publication number 103527105A) are generally used to inject steam to heat the oil layer and reduce the viscosity of heavy oil. The length of a single insulated oil pipe is 9m to 10m, and threaded connection is used during operation. This method has the following disadvantages and shortcomings: the front and rear ends of the insulated oil pipe are not insulated and the heat loss is large; and the outer diameter of the coupling of the insulated oil pipe is much larger than the insulated oil pipe body. Taking the Φ127×76mm insulated oil pipe as an example, the maximum outer diameter of the body is 127mm, but the outer diameter of the matching coupling has reached Φ141.3mm. There is not much spare space in the Φ159.7mm casing, and it is impossible to measure the temperature and pressure outside the insulated pipe; after several trips down the well, the thread will be mechanically damaged to varying degrees, affecting loading and unloading, thereby seriously affecting the operation efficiency.

[0003] During the steam injection and oil production process, it is usually necessary to monitor the temperature and pressure at a specific depth in the well. When inserting special temperature and pressure measuring instruments, due to the limited space of the pipe column, such as the limited annular space caused by the above, or the safety of the wellhead, the inclination of the well and other issues, the ordinary insulated oil pipe cannot meet the needs of steam injection and testing at the same time. In addition, the process technology of using a single insulated oil pipe or ordinary oil pipe for oil production, operation, and testing is generally acceptable for the development of shallow oil fields on land, but for offshore and deep wells, the use of a single insulated oil pipe or ordinary oil pipe for lifting and lowering operations has problems such as long well occupation period and high cost.

[0004] In view of the problems existing in the above-mentioned single insulated oil pipe, relevant domestic research institutions and processing and manufacturing manufacturers have developed insulated oil pipes with different connection methods, such as the Chinese invention patent with publication number 102392607A, which discloses a continuous insulated oil pipe and a manufacturing method thereof, comprising an inner pipe (1), an outer pipe (2) and a heat insulation layer (3), wherein the inner pipe (1) and the outer pipe (2) are both a whole continuous oil pipe, and a heat reflective heat insulation coating (4) is sprayed on the outer wall of the inner pipe (1), and the heat reflective heat insulation coating (4) is wrapped with the heat insulation layer (3); the outer pipe (2) is sleeved on the inner pipe (1) and can be wound on the reel III (7), and positioning rings (5) are evenly distributed on the outer wall of the inner pipe (1), and the two ends of the outer pipe (2) are respectively welded and sealed with the outer walls of the two ends of the inner pipe (1), so that an annulus (6) is formed between the inner pipe (1) and the outer pipe (2). The present invention does not require threaded connection during operation, which increases the service life and operating efficiency of the insulated oil pipe, thereby creating higher economic benefits. The invention patent proposes the use of continuous oil pipes for processing and manufacturing, which changes the traditional single insulated oil pipe threaded connection method and improves the operating efficiency, but does not solve the problem of testing during steam injection. Instead, it causes the existing steam injection testing technology using wire tripping test instruments to be unable to perform steam injection temperature, pressure and other tests in such continuous oil pipes, and it is even more impossible to achieve temperature and pressure measurement inside and outside the steam injection pipe string and online data transmission.

[0005] In addition, during the traditional single insulated oil pipe steam injection process, if the inclination angle of the well is greater than 28°, the traditional method of suspending the test instrument by testing wire cannot monitor the quality of steam injection in the insulated pipe, let alone the temperature and pressure of steam injection between the outside of the insulated pipe and the casing.

[0006] The above situation seriously affects the detection and evaluation of the quality of downhole thermal recovery steam injection, resulting in the oil engineering and technical personnel's unclear understanding of the heat loss along the steam injection process of such oil wells. Therefore, it is necessary to develop and design an integrated continuous oil pipe with thermal insulation, heat preservation and testing. Summary of the invention

[0007] In view of the above-mentioned prior art, the present invention provides an integrated heat-insulating, heat-retaining and testing coiled tubing, which is used for heat-insulating, heat-retaining and monitoring fluid parameters during the injection and production of hot fluids, and can achieve the purposes of real-time online monitoring of the steam injection process, real-time monitoring of the changes in the temperature field and pressure field inside and outside the heat-insulating tubing, and real-time evaluation and analysis of the downhole steam injection quality and heat loss along the way. The coiled tubing of the present invention has the advantages of high operating efficiency and high heat insulation level, solves the problem of downhole fluid temperature and pressure monitoring during steam injection and production, and can meet the needs of special operations in oil fields.

[0008] The present invention is achieved through the following technical solutions:

[0009] An insulation, heat preservation and testing integrated coiled oil pipe, comprising an inner pipe and an outer pipe, wherein the inner pipe is nested in the outer pipe, an annulus is formed between the inner pipe and the outer pipe, the front end of the outer pipe is open, the rear end is sealed, the front end of the inner pipe is open, the rear end is connected to the rear end of the outer pipe and is provided with an oil outlet;

[0010] The outer wall of the inner tube is wrapped with an aluminum foil reflective layer, a first SiC aerogel thermal insulation layer, and a second SiC aerogel thermal insulation layer in sequence from the inside to the outside;

[0011] The annulus is provided with a pressure measuring tube, a temperature measuring tube and a conduit. The ends of the pressure measuring tube, the temperature measuring tube and the conduit are provided with sealing plugs. A sealed chamber is formed between the sealing plug, the inner tube and the outer tube. The inner tube is provided with an opening connected to the chamber. A check valve is provided at the opening (to ensure that the fluid in the chamber can only enter but not exit, thereby reducing the impact of fluctuations during nitrogen pressure measurement);

[0012] The end opening of the pressure measuring tube is communicated with the sealed chamber;

[0013] The temperature measuring tube is in close contact with the inner wall of the outer tube, and its end is sealed. An upper temperature sensing probe and a lower temperature sensing probe are arranged in the temperature measuring tube. The upper temperature sensing probe is in close contact with the inner wall (and thus also in close contact with the inner wall of the outer tube to monitor the temperature of the outer tube), and the lower temperature sensing probe is located at the end of the temperature measuring tube (to monitor the temperature of the fluid in the sealed chamber);

[0014] The end opening of the conduit is communicated with the sealed chamber;

[0015] The outer sides of the pressure measuring tube, the temperature measuring tube, the conduit and the outer tube are all coated with SiC aerogel, and the coating thickness is about 0.5 mm.

[0016] Furthermore, a fixing frame is arranged at a certain interval (such as 50m) in the annulus to fix the pressure measuring tube, temperature measuring tube, conduit and inner tube so that they become a whole with the outer tube to ensure that there is no misalignment when the upper roller is put on (this is a conventional design).

[0017] Preferably, the pressure measuring tube, the temperature measuring tube and the conduit are symmetrically distributed at 120°.

[0018] Preferably, the outer diameters of the pressure measuring tube, the temperature measuring tube and the catheter are consistent.

[0019] Preferably, the sealing part at the rear end of the inner tube and the outer tube is hemispherical in shape, so as to play a guiding role in the process of going down into the well and prevent obstruction.

[0020] Preferably, the inner tube, outer tube, pressure measuring tube, temperature measuring tube and conduit are all made of stainless steel.

[0021] Preferably, the specification of the inner tube is Φ127×76mm (meeting the technical indicators of the current insulated oil pipe body), and the inner diameter and outer diameter are 76mm and 89mm respectively; or / and: the thicknesses of the aluminum foil reflective layer, the first SiC aerogel insulation layer, and the second SiC aerogel insulation layer are 3-6mm, 3mm, and 3mm respectively; or / and: the inner diameter and outer diameter of the outer tube are 108.6mm and 127mm respectively; or / and: the inner diameter and outer diameter of the pressure measuring tube 5, the temperature measuring tube 6 and the conduit 7 are the same, and the outer diameter is the same, which are 4.57mm and 6.35-8mm respectively.

[0022] The heat-insulating, heat-retaining and testing integrated coiled tubing of the present invention can be connected to a heat-sensitive packer (such as Figure 3 As shown), high temperature and high pressure are used during steam injection to realize the sealing of the thermal-sensitive packer in a high-temperature environment. The specific operation and testing process can be as follows: the heat-insulating, heat-preserving and testing integrated continuous oil pipe of the present invention is slowly lowered into the predetermined position of a 5.5in or 7in oil well. During the lowering process, the test data of the temperature and pressure along the way along the way are monitored by the ground direct-reading test equipment, and the test data of the well temperature and well pressure before steam injection with the depth are obtained, which can be used to analyze the heterogeneity of the oil layer section; then the pipe string is lifted to the predetermined position, connected to the ground steam injection pipe string, and steam injection is started according to the steam injection design. The lower temperature probe, the upper temperature probe and the outlet of the pressure measuring tube are used to start real-time monitoring of the temperature inside and outside the steam injection pipe string and the steam injection pressure at this point during steam injection. The steam injection quality and heat loss evaluation technology for the steam injection well developed in conjunction with it is used to analyze the real-time steam injection temperature, pressure, dryness and heat loss during this steam injection process. The packer is sealed at 160℃, thus forming two cavities, one is the hot fluid channel in the coiled tubing, and the other is the non-flow channel in the upper part of the packer. At this time, the upper temperature probe can be used to monitor the single point temperature in the casing annulus or the temperature of the entire wellbore, while the lower temperature probe can monitor the temperature of the injected fluid, and then the comprehensive heat transfer coefficient can be evaluated. A check valve structure is designed in the chamber to ensure that the fluid in the chamber can only enter but not exit, reducing the impact of fluctuations during nitrogen pressure measurement.

[0023] The heat-insulating, heat-preserving and testing integrated continuous oil pipe of the present invention can measure pressure and temperature in real time, so as to monitor the changes of temperature field and pressure field inside and outside the heat-insulating oil pipe in real time: a chamber is designed at the end, and the pressure of the injected or produced fluid can be introduced into the chamber, and a set of movable capillary pressure measurement system is formed through the capillary (pressure measuring tube) connected to the chamber, which can directly monitor the pressure at this point in the well. The thermocouple temperature sensing probe in the temperature measuring tube goes deep into the chamber and is close to the wall of the outer tube, which can directly monitor the temperature at this point in the well.

[0024] The thermal insulation, heat preservation and testing integrated continuous oil pipe of the present invention can achieve maximum thermal insulation and reduce heat loss along the way: the purpose of setting the aluminum foil reflective layer is to reduce the thermal radiation loss in the three modes of heat transfer, and the heat energy radiated from the high-temperature fluid in the inner pipe is reflected back through the high-reflectivity aluminum foil surface to reduce thermal radiation loss. The purpose of setting the SiC aerogel insulation layer (aerogel material with low thermal conductivity) is to reduce the conductive heat loss in the three modes of heat transfer. The SiC aerogel insulation layer is formed by an aerogel (SiO2) composite material doped with SiC (the preparation method refers to Chinese invention patent ZL201510137847.9, publication number 106145881A), and the density of the composite material is 0.2g / cm 3 , the thermal conductivity at room temperature is 0.019W / (m·K), and the thermal conductivity at 400℃ is 0.035W / (m·K), such as Figure 4 As shown. The present invention adopts a two-layer structure, each layer is 3 mm thick. The SiC aerogel mentioned in the present invention is the composite material. When in use, the annulus can be vacuumed (the vacuum degree of the vacuum port can be 10Pa, 1Pa, 0.1Pa, and the relationship curve between vacuum degree and thermal insulation performance is shown in Figure 5 As shown, the apparent thermal conductivity is ≤0.03w / (m.℃)), which reduces the convection heat loss in the three ways of heat transfer and reduces the heat transfer of air flow inside. High-level thermal insulation effect, the above three aspects combine to achieve high-level thermal insulation effect.

[0025] The heat insulation, thermal insulation and testing integrated coiled tubing of the present invention has the following advantages and beneficial effects:

[0026] (1) The use of continuous tubing facilitates construction and reduces the repeated make-up and make-down work during the lifting and lowering of ordinary tubing or insulated tubing, thereby reducing mechanical damage and extending service life.

[0027] (2) The traditional single-insulated oil pipe threaded connection method has been changed, which has improved the efficiency of the operation and solved the problem of steam injection quality and heat loss detection in wells with a well inclination exceeding 28° during steam injection, helping petroleum engineering technicians to clearly understand the steam injection quality and heat loss along the process of such oil wells.

[0028] (3) Due to the use of SiC-doped aerogel insulation material with low thermal conductivity, high temperature resistance and long service life, the developed aerogel insulation pipe has an apparent thermal conductivity of ≤0.03W / (m.℃) and a temperature resistance of 400℃.

[0029] (4) The insulated continuous composite pipe is cleverly combined with a capillary pressure measurement and thermocouple temperature measurement system, which also monitors the temperature and pressure of the downhole fluid during operation, solving many problems in the process of raising and lowering test instruments.

[0030] All documents cited in the present invention are incorporated herein by reference in their entirety, and if the meanings expressed in these documents are inconsistent with the present invention, the description of the present invention shall prevail. In addition, the various terms and phrases used in the present invention have the general meanings known to those skilled in the art. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 : A schematic structural diagram of a heat-insulating, thermally-insulating and testing integrated coiled tubing according to the present invention.

[0032] Figure 2 : Figure 1 AA section view.

[0033] Among them, 1. inner tube; 2. aluminum foil reflective layer; 3. first SiC aerogel insulation layer; 4. second SiC aerogel insulation layer; 5. pressure measuring tube; 6. temperature measuring tube; 7. conduit; 8. outer tube; 9. sealing plug; 10. chamber; 11. limit spring; 12. check valve; 13. oil outlet; 51. pressure measuring tube opening; 61. upper temperature sensing probe; 62. lower temperature sensing probe.

[0034] Figure 3 : Schematic diagram of connection with the thermal packer.

[0035] Among them, 101, thermal insulation, heat preservation and testing integrated continuous tubing; 102, tubing end; 103, thermal sensitive packer.

[0036] Figure 4 This is a graph showing the experimental data of SiC aerogel doped with the present invention.

[0037] Figure 5 The figure is a relationship curve between the vacuum degree and the thermal insulation performance of the present invention. DETAILED DESCRIPTION

[0038] The present invention will be further described below in conjunction with the examples. However, the scope of the present invention is not limited to the following examples. Those skilled in the art will appreciate that various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention.

[0039] The instruments, reagents, materials, etc. involved in the following embodiments, unless otherwise specified, are all conventional instruments, reagents, materials, etc. in the prior art and can be obtained through regular commercial channels. The experimental methods, detection methods, etc. involved in the following embodiments, unless otherwise specified, are all conventional experimental methods, detection methods, etc. in the prior art.

[0040] A heat-insulating, heat-retaining and testing integrated coiled tubing comprises an inner tube 1 and an outer tube 8, such as Figure 1 , Figure 2As shown, the inner tube 1 is nested in the outer tube 8, an annulus is formed between the inner tube 1 and the outer tube 8, the front end of the outer tube 8 is open, and the rear end is sealed, the front end of the inner tube 1 is open, and the rear end is connected to the rear end of the outer tube 8 and is provided with an oil outlet 13;

[0041] The outer wall of the inner tube 1 is wrapped with an aluminum foil reflective layer 2, a first SiC aerogel thermal insulation layer 3 and a second SiC aerogel thermal insulation layer 4 in sequence from the inside to the outside;

[0042] The annulus is provided with a pressure measuring tube 5, a temperature measuring tube 6 and a guide tube 7, which are symmetrically distributed at 120°. A fixing frame is set every 50m in the annulus to fix the pressure measuring tube 5, the temperature measuring tube 6, the guide tube 7 and the inner tube 1, so that they become a whole with the outer tube 8 to ensure that there is no misalignment when the roller is put on.

[0043] The ends of the pressure measuring tube 5, the temperature measuring tube 6 and the conduit 7 are provided with sealing plugs 9, and a sealed chamber 10 is formed between the sealing plug 9, the inner tube 1 and the outer tube 8. The inner tube 1 is provided with an opening connected to the chamber 10, and a limit spring 11 and a check valve 12 are provided at the opening (to ensure that the fluid in the chamber can only enter but not exit, thereby reducing the influence of fluctuations during the nitrogen pressure measurement process);

[0044] The end opening of the pressure measuring tube 5 (pressure measuring tube opening 51) is connected to the sealed chamber 10;

[0045] The temperature measuring tube 6 is in close contact with the inner wall of the outer tube, and its end is sealed. An upper temperature sensing probe 61 and a lower temperature sensing probe 62 are arranged in the temperature measuring tube 6. The upper temperature sensing probe 61 is in close contact with the inner wall (and thus also in close contact with the inner wall of the outer tube to monitor the temperature of the outer tube), and the lower temperature sensing probe 62 is located at the end of the temperature measuring tube 5 (to monitor the temperature of the fluid in the sealed chamber);

[0046] The end of the conduit 7 is open and communicated with the sealed chamber 10 .

[0047] The outer sides of the pressure measuring tube 5 , the temperature measuring tube 6 , the guide tube 7 and the outer tube 8 are all coated with SiC aerogel with a coating thickness of 0.5 mm.

[0048] The sealing part at the rear end of the inner tube 1 and the outer tube 8 is in a hemispherical shape, so as to play a guiding role in the process of going down into the well and prevent obstruction.

[0049] The inner tube 1, the outer tube 8, the pressure measuring tube 5, the temperature measuring tube 6 and the guide tube 7 are all made of stainless steel.

[0050] The specification of the inner tube 1 is Φ127×76mm (meeting the technical indicators of the current insulated oil pipe body), and the inner diameter and outer diameter are 76mm and 89mm respectively; the thicknesses of the aluminum foil reflective layer 2, the first SiC aerogel insulation layer 3, and the second SiC aerogel insulation layer 4 are 3mm, 3mm, and 3mm respectively; the inner diameter and outer diameter of the outer tube 8 are 108.6mm and 127mm respectively; the inner diameter and outer diameter of the pressure measuring tube 5, the temperature measuring tube 6 and the conduit 7 are the same, which are 4.57mm and 6.35mm respectively; or: 4.57mm and 8mm.

[0051] The heat-insulating, heat-retaining and testing integrated continuous tubing of the present invention can be connected to a thermosensitive packer at the end when in use, and the high temperature and high pressure during the steam injection process can be used to realize the sealing of the thermosensitive packer in a high temperature environment. The specific operation and testing process can be as follows: the heat-insulating, heat-retaining and testing integrated continuous tubing of the present invention is slowly lowered to the predetermined position of a 5.5in or 7in oil well, and the test data of the temperature and pressure along the way along the way during the lowering process are monitored by a ground direct reading test device (temperature and pressure data acquisition system, existing products and technologies in the prior art) to obtain the test data of the well temperature and well pressure before steam injection with the depth, which can be used to analyze the heterogeneity of the oil layer section; then the pipe string is lifted to the predetermined position, connected to the ground steam injection pipe string, and steam injection is started according to the steam injection design, and the lower temperature sensing probe, the upper temperature sensing probe and the outlet of the pressure measuring tube are used to start real-time monitoring of the temperature inside and outside the steam injection pipe string and the steam injection pressure at the point during steam injection. The steam injection quality and heat loss evaluation technology of the steam injection well developed in conjunction with it is used to analyze the real-time steam injection temperature, pressure, dryness and heat loss during this steam injection process. The packer is sealed at 160℃, thus forming two cavities, one is the hot fluid channel in the coiled tubing, and the other is the non-flow channel in the upper part of the packer. At this time, the upper temperature probe can be used to monitor the single point temperature in the casing annulus or the temperature of the entire wellbore, while the lower temperature probe can monitor the temperature of the injected fluid, and then the comprehensive heat transfer coefficient can be evaluated. A check valve structure is designed in the chamber to ensure that the fluid in the chamber can only enter but not exit, reducing the impact of fluctuations during nitrogen pressure measurement.

[0052] The above examples are provided to those skilled in the art to fully disclose and describe how to make and use the claimed embodiments, and are not intended to limit the scope of the disclosure herein. Modifications that are obvious to those skilled in the art will fall within the scope of the appended claims.

Claims

1. A coiled tubing with thermal insulation, heat preservation and testing integrated, characterized by: It includes an inner tube and an outer tube, the inner tube is nested in the outer tube, an annulus is formed between the inner tube and the outer tube, the front end of the outer tube is open, the rear end is sealed, the front end of the inner tube is open, the rear end is connected to the rear end of the outer tube and is provided with an oil outlet; The outer wall of the inner tube is wrapped with an aluminum foil reflective layer, a first SiC aerogel thermal insulation layer, and a second SiC aerogel thermal insulation layer in sequence from the inside to the outside; A pressure measuring tube, a temperature measuring tube and a guide tube are arranged in the annulus, and sealing plugs are arranged at the ends of the pressure measuring tube, the temperature measuring tube and the guide tube. A sealed chamber is formed between the sealing plug, the inner tube and the outer tube. An opening communicating with the chamber is arranged on the inner tube, and a check valve and / or a limit spring are arranged at the opening. The end opening of the pressure measuring tube is communicated with the sealed chamber; The temperature measuring tube is close to the inner wall of the outer tube, and its end is sealed. An upper temperature sensing probe and a lower temperature sensing probe are arranged in the temperature measuring tube. The upper temperature sensing probe is close to the inner wall, and the lower temperature sensing probe is located at the end of the temperature measuring tube. The end opening of the conduit is communicated with the sealed chamber; The outer sides of the pressure measuring tube, the temperature measuring tube, the conduit and the outer tube are all coated with SiC aerogel; The end of the heat insulation, thermal insulation and testing integrated coiled tubing is connected to a packer; The packer seat seal forms two cavities, one is the hot fluid channel inside the continuous tubing, and the other is the non-flow channel in the upper part of the packer. At this time, the upper temperature sensing probe can be used to monitor the single-point temperature in the casing annulus or the temperature of the entire wellbore, while the lower temperature sensing probe can monitor the temperature of the injected fluid, thereby evaluating the comprehensive heat transfer coefficient.

2. The heat insulation, thermal insulation and testing integrated coiled tubing according to claim 1, characterized in that: A fixing frame is arranged in the annulus to fix the pressure measuring tube, the temperature measuring tube, the guide tube and the inner tube.

3. The heat insulation, thermal insulation and testing integrated coiled tubing according to claim 1, characterized in that: The pressure measuring tube, the temperature measuring tube and the guide tube are symmetrically distributed at 120 degrees.

4. The heat insulation, thermal insulation and testing integrated coiled tubing according to claim 1, characterized in that: The sealing part at the rear end of the inner tube and the outer tube is in a hemispherical shape.

5. The heat insulation, thermal insulation and testing integrated coiled tubing according to claim 1, characterized in that: The inner tube, outer tube, pressure measuring tube, temperature measuring tube and conduit are all made of stainless steel.

6. The heat insulation, thermal insulation and testing integrated coiled tubing according to claim 1, characterized in that: The specification of the inner tube is Φ127×76mm, and the inner diameter and outer diameter are 76mm and 89mm respectively; Or / and: the inner diameter and outer diameter of the outer tube are 108.6 mm and 127 mm respectively; Or / and: the inner diameter and outer diameter of the pressure measuring tube (5), the temperature measuring tube (6) and the guide tube (7) are the same, which are 4.57 mm and 6.35-8 mm respectively.

7. The heat insulation, thermal insulation and testing integrated coiled tubing according to claim 1, characterized in that: The thicknesses of the aluminum foil reflective layer, the first SiC aerogel thermal insulation layer, and the second SiC aerogel thermal insulation layer are 3-6 mm, 3 mm, and 3 mm, respectively; Or / and: the thickness of the SiC aerogel coated on the outer sides of the pressure measuring tube, the temperature measuring tube, the conduit and the outer tube is 0.5 mm.

8. The heat insulation, thermal insulation and testing integrated coiled tubing according to claim 1, characterized in that: The packer is a heat-sensitive packer.

9. A method for downhole testing using a heat-insulating, thermally-insulating and testing integrated coiled tubing according to any one of claims 1 to 8, characterized in that: The heat-insulating, thermal-holding and testing integrated continuous tubing is lowered into the predetermined position of the oil well. During the lowering process, the surface direct-reading test equipment is used to monitor the test data of temperature and pressure along the way along the way as the depth of the well; then it is lifted up to the predetermined position, connected to the surface steam injection string, and steam injection is started. The lower temperature sensing probe, upper temperature sensing probe and the outlet of the pressure measuring tube are used to start real-time monitoring of the temperature inside and outside the steam injection string and the steam injection pressure at that point during steam injection.

10. The method according to claim 9, characterized in that: The ground direct reading test equipment is a temperature and pressure data acquisition system.

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