Thermal insulation testing device for inner coating of drill rod

Abstract

The invention provides a drill rod inner coating heat insulation testing device which comprises a container internally provided with a medium, a to-be-tested drill rod arranged in the medium in the container, a first temperature sensor arranged in the to-be-tested drill rod and a heating assembly arranged in the container and used for heating the medium, and the inner wall of the to-be-tested drill rod is provided with a heat insulation coating. Drilling fluid is introduced into a space formed by the inner wall of the coating, the drilling fluid can be heated under heat transfer of a medium, and the first temperature sensor is used for detecting the temperature of the drilling fluid so as to judge the heat insulation effect of the coating according to the detected temperature change. According to the invention, evaluation and analysis on the heat insulation effect of the coating in the drill rod can be completed in an indoor environment, so that the cooling capability of the coating heat insulation on the circulating temperature of the drilling fluid of a shaft under the test condition is determined, the service life and the test precision of a test instrument in the drill rod are ensured, and the safety of drilling operation is effectively ensured.

Description

Technical Field

[0001] The invention relates to the technical field of drill pipe coating thermal insulation testing, in particular to a drill pipe inner coating thermal insulation testing device. Background Art

[0002] In drilling operations, it is crucial to control the temperature of the drilling fluid to avoid its rapid temperature rise, which directly affects the drilling efficiency. Therefore, it is necessary to control the wellbore circulation temperature.

[0003] At present, the main temperature control method for cooling the drilling fluid in the well is to set a thermal insulation coating on the inner or outer wall of the drill pipe to achieve cooling. The principle is to apply a layer of thermal insulation coating on the inner or outer wall of the drill pipe to reduce the overall thermal conductivity of the drill pipe. Since the drill pipe will contact the well wall during drilling, the coating on the outer wall of the drill pipe is easy to fall off. Therefore, in actual construction, the inner wall coating of the drill pipe is often used for insulation. Since the insulation of the inner wall coating of the drill pipe is in the research and development and preliminary testing stage, the laboratory lacks a test system for the insulation effect of the inner coating of the drill pipe. Summary of the invention

[0004] One purpose of the present invention is to propose a drill pipe inner coating insulation testing device to solve the problem of lack of drill pipe inner coating insulation testing system, to achieve evaluation and analysis of the drill pipe inner coating insulation effect in an indoor environment, and then to clarify the coating insulation's ability to cool the wellbore drilling fluid circulation temperature under test conditions, to ensure the service life of the test instrument in the drill pipe and the accuracy of the test, and to effectively ensure the safety of drilling operations.

[0005] According to the present invention, a drill pipe inner coating thermal insulation testing device is provided, comprising a container with a medium inside, a drill pipe to be tested arranged in the medium in the container, a first temperature sensor arranged inside the drill pipe to be tested, and a heating component arranged in the container and used to heat the medium. The inner wall of the drill pipe to be tested is provided with a thermal insulation coating, and drilling fluid is passed into the space formed by the inner wall. The drilling fluid can be heated under the heat transfer of the medium. The first temperature sensor is used to detect the temperature of the drilling fluid, so as to judge the thermal insulation effect of the coating according to the measured temperature change.

[0006] In a preferred embodiment, the drill pipe inner coating thermal insulation testing device also includes a second temperature sensor for detecting the medium temperature and a PLC control system that is respectively communicated with the second temperature sensor and the heating component. When the second temperature sensor measures that the medium temperature in the container is higher than a set temperature range, the PLC control system controls the heating component to stop heating the medium. When the second temperature sensor measures that the medium temperature in the container is lower than the set temperature range, the PLC control system controls the heating component to continue heating the medium.

[0007] In a preferred embodiment, the heating assembly includes a plurality of heating tubes arranged in the container along the axial direction of the drill rod to be tested.

[0008] In a preferred embodiment, the drill pipe inner coating thermal insulation testing device further comprises a fixing frame arranged in the container, and the heating tube is fixed in the container via the fixing frame.

[0009] In a preferred embodiment, the drill pipe inner coating thermal insulation testing device further comprises a sealing ring, which is sleeved on the outer periphery of the drill pipe to be tested and seals the contact point between the drill pipe to be tested and the container.

[0010] In a preferred embodiment, the drill pipe inner coating thermal insulation testing device further comprises a pressure sensor disposed on the inner wall of the drill pipe to be tested, for detecting the pressure of the drilling fluid.

[0011] In a preferred embodiment, the drill pipe inner coating thermal insulation testing device also includes a condenser, a storage device and a booster pump. The outlet end of the drill pipe to be tested is connected to the condenser, the booster pump is arranged on a pipe close to the inlet end of the drill pipe to be tested, and the condenser is connected to the storage device through a connecting pipe.

[0012] In a preferred embodiment, the condenser and the pressure sensor are respectively connected to the PLC control system for communication, and the PLC control system is capable of receiving a detection signal from the pressure sensor and adjusting the power of the condenser according to the detection signal.

[0013] In a preferred embodiment, the drill pipe inner coating thermal insulation testing device also includes an electromagnetic flow valve arranged at the outlet end of the drill pipe to be tested, and the electromagnetic flow valve is communicatively connected to the PLC control system. The PLC control system can receive a detection signal from the pressure sensor and adjust the opening of the electromagnetic flow valve according to the detection signal.

[0014] In a preferred embodiment, the container is provided with an inlet at the top for injecting the medium, and an outlet at the bottom for discharging the medium, and a valve is provided at the outlet.

[0015] The present invention comprises a container with a medium inside, a drill pipe to be tested arranged in the medium in the container, a first temperature sensor arranged inside the drill pipe to be tested, a heating component arranged in the container and used to heat the medium, the inner wall of the drill pipe to be tested is provided with a heat insulation coating and drilling fluid is passed through the space formed by the inner wall and the drilling fluid can be heated under the heat transfer of the medium, and the first temperature sensor is used to detect the temperature of the drilling fluid, so as to judge the heat insulation effect of the coating according to the measured temperature change, thereby being able to complete the evaluation and analysis of the heat insulation effect of the coating in the drill pipe under indoor environment, and further clarifying the cooling ability of the coating insulation on the circulating temperature of the wellbore drilling fluid under test conditions, ensuring the service life of the test instrument in the drill pipe and the test accuracy, and effectively ensuring the safety of the drilling operation.

[0016] The present invention can maintain the temperature of the medium within the set range by controlling the PLC control system to stop heating the medium when the second temperature sensor measures that the temperature of the medium in the container is higher than the set temperature range, and by controlling the PLC control system to continue heating the medium when the second temperature sensor measures that the temperature of the medium in the container is lower than the set temperature range, thereby improving the accuracy of the test.

[0017] The present invention is respectively connected to a PLC control system through a condenser and a pressure sensor, and the PLC control system receives a detection signal from the pressure sensor and adjusts the power of the condenser according to the detection signal. The power of the condenser can be adjusted in real time according to the pressure of the drilling fluid inside the drill pipe to be tested, thereby improving the condensation efficiency of the drilling fluid.

[0018] The present invention is connected to the PLC control system through an electromagnetic flow valve, and the PLC control system can receive a detection signal from a pressure sensor and adjust the opening of the electromagnetic flow valve according to the detection signal. The residence time of the drilling fluid in the drill pipe to be tested can be adjusted in real time according to the pressure of the drilling fluid inside the drill pipe to be tested, thereby avoiding excessive or insufficient drilling fluid flow inside the drill pipe to be tested and improving the test efficiency.

[0019] The present invention comprises a condenser, a storage device and a booster pump, the outlet end of the drill pipe to be tested is connected to the condenser through a pipeline, a booster pump is arranged on the pipeline close to the inlet end of the drill pipe to be tested, and the condenser and the storage device are connected through a connecting pipeline, so that the utilization rate of the drilling fluid can be greatly improved by recycling the drilling fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The overall structural diagram of the drill pipe inner coating thermal insulation testing device according to the present invention is schematically shown;

[0021] Figure 2 Another structural schematic diagram of the drill pipe inner coating thermal insulation testing device according to the present invention is schematically shown.

[0022] In the present application, all drawings are schematic drawings, which are only used to illustrate the principles of the present invention and are not drawn according to the actual scale. DETAILED DESCRIPTION

[0023] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. It should be noted that, in the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other arbitrarily.

[0024] In the description of the present invention, it is necessary to understand that the terms "inside", "outside", "axial" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0025] In the description of the present invention, “plurality” means two or more than two, unless otherwise clearly and specifically defined.

[0026] In the present invention, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] like Figure 1As shown, the drill pipe inner coating thermal insulation test device 100 of the present invention comprises a container 17 with a medium inside, a drill pipe to be tested 5 arranged in the medium in the container 17, a first temperature sensor 10 arranged inside the drill pipe to be tested 5, and a heating component 16 arranged in the container 17 and used to heat the medium, wherein the container 17 is formed into a cylinder, and the drill pipe to be tested 5 is parallel to the axis of the container 17. Optionally, the container 17 can be a barrel. The inner wall of the drill pipe to be tested 5 is provided with a thermal insulation coating (not shown in the figure), and drilling fluid is passed into the space formed by the inner wall of the drill pipe 5. Since the heating component 16 can heat the medium in the container 17 to increase the temperature of the medium, the drill pipe to be tested 5 is arranged inside the medium, so that the medium can heat the drill pipe to be tested 5, and the drilling fluid can then be heated under the heat transfer of the medium. The first temperature sensor 10 is arranged on the inner wall of the drill pipe to be tested 5, and can be used to detect the temperature of the drilling fluid inside the drill pipe to be tested 5. According to the heating rate of the drilling fluid inside the drill pipe to be tested 5, the thermal insulation effect of the coating can be judged. The medium described in the present invention is a heating medium, for example, oil.

[0028] The present invention includes a container 17 with a medium inside, a drill pipe 5 to be tested arranged in the medium in the container 17, a first temperature sensor 10 arranged inside the drill pipe 5 to be tested, a heating component 16 arranged in the container 17 and used to heat the medium, the inner wall of the drill pipe 5 to be tested is provided with a thermal insulation coating and drilling fluid is passed through the space formed by the inner wall and the drilling fluid can be heated under the heat transfer of the medium, and the first temperature sensor 10 is used to detect the temperature of the drilling fluid, so as to judge the thermal insulation effect of the coating according to the measured temperature change, so that the thermal insulation effect of the coating in the drill pipe can be evaluated and analyzed in an indoor environment, and then the cooling ability of the coating insulation on the circulating temperature of the wellbore drilling fluid under the test conditions is clarified, thereby ensuring the service life of the test instrument in the drill pipe and the accuracy of the test, and effectively ensuring the safety of the drilling operation.

[0029] In one or more embodiments, the drill pipe inner coating thermal insulation testing device 100 described in the present invention also includes a second temperature sensor 8 for detecting the medium temperature and a PLC control system that is respectively communicated with the second temperature sensor 8 and the heating component 16. The second temperature sensor 8 is arranged in the container 17. When the second temperature sensor 8 measures that the medium temperature in the container 17 is higher than the set temperature range, the PLC control system controls the heating component 16 to stop heating the medium. When the second temperature sensor 8 measures that the medium temperature in the container 17 is lower than the set temperature range, the PLC control system controls the heating component 16 to continue heating the medium, so that the temperature of the medium can be kept within the set range, thereby improving the accuracy of the test, wherein the set temperature range can be set as needed.

[0030] In one or more embodiments, the difference between the temperature of the drilling fluid inside the drill pipe 5 measured by the first temperature sensor 10 and the temperature of the medium in the container 17 measured by the second temperature sensor 8 can be used to analyze and determine the thermal insulation effect of the coating inside the drill pipe.

[0031] In one or more embodiments, the heating assembly 16 includes a plurality of heating tubes arranged in the container 17 along the axial direction of the drill rod 5 to be tested. The axes of the plurality of heating tubes are parallel to the axis of the drill rod 5 to be tested. Optionally, the heating assembly 16 includes six heating tubes, which are respectively arranged on the upper and lower sides of the drill rod 5 to be tested. The ends of the heating tubes are connected to the electrode columns 13, which are exposed outside the container 17 for power supply.

[0032] In one or more embodiments, the drill pipe inner coating thermal insulation testing device 100 of the present invention further includes a plurality of fixing frames 9 disposed in the container 17, and a plurality of heating tubes are fixed in the container 17 through the fixing frames 9. Specifically, each fixing frame 9 is provided with a through hole, and the heating tube passes through the through hole and is fixedly connected to the fixing frame 9 through the through hole.

[0033] In one or more embodiments, the drill pipe internal coating thermal insulation test device 100 of the present invention further includes a sealing ring 6, which is sleeved on the outer periphery of the drill pipe 5 to be tested and seals the contact between the drill pipe 5 to be tested and the container 17, thereby preventing leakage of the medium. Specifically, the drill pipe internal coating thermal insulation test device 100 of the present invention includes two sealing rings 6 located in the container 17, which are respectively arranged at the position where the drill pipe 5 to be tested contacts the container 17. It should be noted that when performing the test work, the air tightness of the drill pipe internal coating thermal insulation test device 100 is first checked.

[0034] In one or more embodiments, the container 17 is provided with an inlet 7 for injecting the medium at the top, an outlet 15 for discharging the medium at the bottom, and a valve 14 is provided at the outlet 15. On the premise of ensuring good air tightness of the test device, the valve 14 is closed, and then the medium is added into the container 17, and then the drilling fluid is passed into the drill pipe 5 to be tested, and the heating component 16 is started to heat the medium.

[0035] In one or more embodiments, a support 18 is disposed at the bottom of the container 17. The support 118 includes an arc-shaped support portion and a bottom plate connected to the bottom end of the arc-shaped support portion.

[0036] In the present invention, a support 18 is provided at the bottom of the container 17 to keep the container 17 stable, so as to facilitate smooth testing.

[0037] In one or more embodiments, the drill pipe inner coating thermal insulation testing device 100 of the present invention further includes a pressure sensor 11 disposed on the inner wall of the drill pipe 5 to be tested, for detecting the pressure of the drilling fluid inside the drill pipe 5 to be tested.

[0038] like Figure 2 As shown, in one or more embodiments, the drill pipe inner coating thermal insulation testing device 100 of the present invention further includes a condenser 1, a storage 3 and a booster pump 4. The outlet end of the drill pipe 5 to be tested is connected to the condenser 1 through a pipeline, and a booster pump 4 is provided on the pipeline near the inlet end of the drill pipe 5 to be tested. The condenser 1 is connected to the storage 3 through a connecting pipe 2. The drilling fluid entering the inside of the drill pipe 5 to be tested from the inlet 7 flows out from the outlet end of the drill pipe 5 to be tested under the action of the booster pump, enters the condenser 1 for condensation, and then flows back to the storage 3 through the connecting pipe 2.

[0039] The present invention includes a condenser 1, a storage 3 and a booster pump 4, and the outlet end of the drill pipe 5 to be tested is connected to the condenser 1 through a pipeline, and a booster pump 4 is arranged on the pipeline near the inlet end of the drill pipe 5 to be tested, and the condenser 1 is connected to the storage 3 through a connecting pipe 2. The drilling fluid can be recycled to greatly improve the utilization rate of the drilling fluid.

[0040] In one or more embodiments, the condenser 1 and the pressure sensor 11 are respectively connected to a PLC control system for communication. The PLC control system can receive a detection signal from the pressure sensor 11 and adjust the power of the condenser 1 according to the detection signal.

[0041] The present invention is respectively connected to the PLC control system through the condenser 1 and the pressure sensor 11 for communication, and the PLC control system receives the detection signal of the pressure sensor 11 and adjusts the power of the condenser 1 according to the detection signal. The power of the condenser 1 can be adjusted in real time according to the pressure of the drilling fluid inside the drill pipe 5 to be tested, thereby improving the condensation efficiency of the drilling fluid.

[0042] In one or more embodiments, an electromagnetic flow valve 12 is provided at the outlet end of the drill pipe 5 to be tested, and the electromagnetic flow valve 12 is communicatively connected to the PLC control system. The PLC control system can receive a detection signal from the pressure sensor 11 and adjust the opening of the electromagnetic flow valve 12 according to the detection signal.

[0043] The present invention is communicatively connected with the PLC control system through the electromagnetic flow valve 12, and the PLC control system can receive the detection signal from the pressure sensor 11, and adjust the opening of the electromagnetic flow valve 12 according to the detection signal, and can adjust the residence time of the drilling fluid in the drill pipe 5 to be tested in real time according to the pressure of the drilling fluid inside the drill pipe 5 to be tested, so as to avoid excessive or insufficient flow of the drilling fluid inside the drill pipe 5 to be tested, thereby improving the test efficiency.

[0044] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A drill pipe inner coating thermal insulation testing device, comprising a container with a medium inside, a drill pipe to be tested disposed in the medium in the container, a first temperature sensor disposed inside the drill pipe to be tested, and a heating component disposed in the container and used to heat the medium. The inner wall of the drill pipe to be tested is provided with a thermal insulation coating, and drilling fluid is passed into the space formed by the inner wall. The drilling fluid can be heated up under the heat transfer of the medium. The first temperature sensor is used to detect the temperature of the drilling fluid to judge the thermal insulation effect of the coating according to the measured temperature change.

2. The drill pipe inner coating thermal insulation testing device according to claim 1, It is characterized in that It also includes a second temperature sensor for detecting the temperature of the medium and a PLC control system which is respectively connected to the second temperature sensor and the heating component for communication. When the second temperature sensor measures that the temperature of the medium in the container is higher than the set temperature range, the PLC control system controls the heating component to stop heating the medium. When the second temperature sensor measures that the temperature of the medium in the container is lower than the set temperature range, the PLC control system controls the heating component to continue heating the medium.

3. The drill pipe inner coating thermal insulation testing device according to claim 1, It is characterized in that The heating assembly comprises a plurality of heating tubes which are arranged in the container along the axial direction of the drill rod to be tested.

4. The drill pipe inner coating thermal insulation testing device according to claim 3, It is characterized in that It also includes a fixing frame arranged in the container, and the heating tube is fixed in the container through the fixing frame.

5. The drill pipe inner coating thermal insulation testing device according to claim 1, It is characterized in that It also includes a sealing ring, which is sleeved on the outer periphery of the drill rod to be tested and seals the contact between the drill rod to be tested and the container.

6. The drill pipe inner coating thermal insulation testing device according to claim 2, It is characterized in that It also includes a pressure sensor arranged on the inner wall of the drill pipe to be tested, which is used to detect the pressure of the drilling fluid.

7. The drill pipe inner coating thermal insulation testing device according to claim 6, It is characterized in that It also includes a condenser, a storage device and a booster pump. The outlet end of the drill pipe to be tested is connected to the condenser. The booster pump is arranged on a pipeline close to the inlet end of the drill pipe to be tested. The condenser is connected to the storage device through a connecting pipeline.

8. The drill pipe inner coating thermal insulation testing device according to claim 7, It is characterized in that The condenser and the pressure sensor are respectively connected to the PLC control system for communication. The PLC control system can receive a detection signal from the pressure sensor and adjust the power of the condenser according to the detection signal.

9. The drill pipe inner coating thermal insulation testing device according to claim 6, It is characterized in that It also includes an electromagnetic flow valve arranged at the outlet end of the drill pipe to be tested, the electromagnetic flow valve is communicatively connected to the PLC control system, the PLC control system can receive a detection signal from the pressure sensor, and adjust the opening of the electromagnetic flow valve according to the detection signal.

10. The drill pipe inner coating thermal insulation testing device according to claim 1, It is characterized in that The container is provided with an inlet at the top for injecting the medium, and an outlet at the bottom for discharging the medium, and a valve is provided at the outlet.

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