Automatic heat insulation testing device for inner coating of drill rod

Abstract

The invention provides an automatic heat insulation testing device for an inner coating of a drill rod. Comprising a container, a to-be-tested drill rod, an electromagnetic heater, a first temperature sensor, a first electromagnetic flow valve, a second electromagnetic flow valve and a second temperature sensor, wherein a medium is arranged in the container; the to-be-tested drill rod is arranged in the medium in the container; a heat insulation coating is arranged on the inner wall of the to-be-tested drill rod; the control system is in communication connection with the first electromagnetic flow valve and the second electromagnetic flow valve, the electromagnetic heater is used for heating a medium in the container, and the first temperature sensor is used for detecting temperature information of the medium in the container and sending the temperature information to the control system; the control system controls the first electromagnetic flow valve and the second electromagnetic flow valve to be opened, so that drilling fluid flows in the to-be-detected drill rod. The drill rod inner coating heat insulation test can be automatically realized, and the test efficiency and accuracy are improved.

Description

Technical Field

[0001] The invention relates to the technical field of drill pipe coating thermal insulation testing, and in particular to an automatic thermal insulation testing device for drill pipe inner coating. 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, there are few test systems for the insulation effect of the inner coating of the drill pipe in the laboratory. Some existing test systems in the prior art cannot realize automated testing, resulting in low test efficiency and affecting the accuracy of the test. Summary of the invention

[0004] An object of the present invention is to provide an automated thermal insulation testing device for inner coating of a drill pipe, which can automatically implement thermal insulation testing of inner coating of a drill pipe and improve testing efficiency and accuracy.

[0005] According to the present invention, there is provided an automated thermal insulation testing device for inner coating of a drill pipe, comprising a container having a medium inside, a drill pipe to be tested which is arranged in the medium in the container and has a thermal insulation coating on its inner wall, an electromagnetic heater, a first temperature sensor arranged inside the container, a first electromagnetic flow valve and a second electromagnetic flow valve arranged on pipes on both sides of the drill pipe to be tested, and a control system which is communicatively connected to the first temperature sensor, the first electromagnetic flow valve and the second electromagnetic flow valve respectively, wherein the electromagnetic heater is used for heating the medium in the container, the first temperature sensor is used for detecting the temperature information of the medium in the container and sending it to the control system, and when the temperature detected by the first temperature sensor reaches a set temperature range, the control system controls the first electromagnetic flow valve and the second electromagnetic flow valve to open so that drilling fluid can flow inside the drill pipe to be tested.

[0006] In a preferred embodiment, the electromagnetic heater is communicatively connected to the control system. When the first temperature sensor measures that the temperature of the medium in the container is higher than a set temperature range, the control system controls the electromagnetic heater to stop heating the medium. When the first temperature sensor measures that the temperature of the medium in the container is lower than the set temperature range, the control system controls the electromagnetic heater to continue heating the medium.

[0007] In a preferred embodiment, the electromagnetic heaters are disposed on both sides of the container and are in contact with the container.

[0008] In a preferred embodiment, the medium is oil.

[0009] In a preferred embodiment, the drill pipe inner coating automated 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 automated thermal insulation testing device for the drill pipe inner coating also includes a first pressure sensor and a second pressure sensor arranged on pipes connected to both sides of the drill pipe to be tested, the first pressure sensor and the second pressure sensor are respectively communicated with the control system, and the control system can control the opening of the first electromagnetic flow valve and the second electromagnetic flow valve respectively according to the pressure signals fed back by the first pressure sensor and the second pressure sensor.

[0011] In a preferred embodiment, the automated thermal insulation testing device for the drill pipe inner coating also includes a condenser, a storage tank and a booster pump for cooling the drilling fluid, the outlet end of the drill pipe to be tested is connected to the condenser, the condenser is connected to the storage tank through a connecting pipe, and the booster pump is arranged in the storage tank and connected to the inlet end of the drill pipe to be tested through a pipe.

[0012] In a preferred embodiment, the condenser is communicatively connected to the control system, and the control system can adjust the power of the condenser according to the detection signals fed back by the first pressure sensor and the second pressure sensor.

[0013] In a preferred embodiment, the boost pump is communicatively connected to the control system, and the control system can adjust the power of the boost pump according to the detection signals fed back by the first pressure sensor and the second pressure sensor.

[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 has at least the following technical effects:

[0016] When the temperature detected by the first temperature sensor reaches the set temperature range, the control system controls the first electromagnetic flow valve and the second electromagnetic flow valve to open, so that the drilling fluid flows inside the drill pipe to be tested, thereby automatically testing the thermal insulation performance of the coating inside the drill pipe, avoiding manual operation leading to the drilling fluid being introduced into the drill pipe to be tested before the set temperature range or the drilling fluid being introduced into the drill pipe after exceeding the set temperature range, which causes the test temperature range of the drill pipe to be inaccurate, thereby improving the test efficiency and accuracy. In addition, by setting the set temperature range, the present invention can also perform automated testing under multiple set temperature ranges, expand the test temperature range of the coating insulation inside the drill pipe, and improve the accuracy of the test data.

[0017] The present invention can evaluate and analyze the thermal insulation effect of the coating inside the drill pipe under indoor conditions, and further clarify the cooling ability of the coating insulation on the circulating temperature of the wellbore drilling fluid under indoor test conditions, thereby ensuring the service life of the test instruments in the drill pipe and the test accuracy, and effectively ensuring the safety of the drilling operation.

[0018] The present invention is connected to the control system through the condenser communication, and the control system can adjust the power of the condenser according to the detection signal fed back by the first pressure sensor and the second pressure sensor. When the pressure fed back by the first pressure sensor and the second pressure sensor is large, it indicates that the flow rate of the coolant to be cooled flowing out from the inside of the drill pipe to be tested is large, and the control system increases the power of the condenser, thereby improving the condensation efficiency of the drilling fluid. When the pressure fed back by the first pressure sensor and the second pressure sensor is small, it indicates that the flow rate of the coolant to be cooled flowing out from the inside of the drill pipe to be tested is small, and the control system reduces the power of the condenser, thereby avoiding wasting the power of the condenser. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The overall structure diagram of the automatic thermal insulation testing device for inner coating of a drill pipe according to the present invention is schematically shown;

[0020] Figure 2 The structure diagram of the electromagnetic heater according to the present invention is schematically shown;

[0021] Figure 3 Another structural schematic diagram of the automatic thermal insulation testing device for inner coating of a drill pipe 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 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.

[0026] like Figure 1 As shown, the automatic thermal insulation test device 100 for inner coating of drill pipe of the present invention comprises a container 17 with a medium inside, a drill pipe 16 to be tested which is arranged in the medium in the container 17 and has a thermal insulation coating on the inner wall, an electromagnetic heater 13, a first temperature sensor 18 arranged inside the container 17, a first electromagnetic flow valve 1 and a second electromagnetic flow valve 4 arranged on the pipes connected to both sides of the drill pipe 16 to be tested, and a control system (not shown in the figure) which is respectively communicated and connected with the first temperature sensor 18, the first electromagnetic flow valve 1 and the second electromagnetic flow valve 4, wherein the container 17 is formed into a rectangular parallelepiped, and the axis of the drill pipe 16 to be tested is parallel to the axis of the container 17, and optionally, the container 17 can be a barrel. The inner wall of the drill pipe 16 to be tested is provided with a thermal insulation coating (not shown in the figure). The first electromagnetic flow valve 1 and the second electromagnetic flow valve 4 are respectively arranged on the pipes connected to the inlet and outlet ends of the drill pipe 16 to be tested.

[0027] The electromagnetic heater 13 is used to heat the medium in the container 17, and the first temperature sensor 18 is used to detect the temperature information of the medium in the container 17 and send it to the control system. When the temperature detected by the first temperature sensor 18 reaches the set temperature range, the control system controls the first electromagnetic flow valve 1 and the second electromagnetic flow valve 4 to open, so that the drilling fluid can flow inside the drill pipe 16 to be tested.

[0028] Since the electromagnetic heater 16 can heat the medium in the container 17 to increase the temperature of the medium, the drill pipe 16 to be tested is arranged inside the medium, so that the medium can heat the drill pipe 16 to be tested. When the temperature detected by the first temperature sensor 18 is greater than the set temperature range, the control system controls the first electromagnetic flow valve 1 and the second electromagnetic flow valve 4 to open, so that the drilling fluid flows inside the drill pipe 16 to be tested. The drilling fluid inside the drill pipe 16 to be tested can then be heated under the heat transfer of the medium. A temperature sensor can be arranged on the inner wall of the drill pipe 16 to detect the temperature of the drilling fluid inside the drill pipe 16 to be tested. According to the measured temperature change (for example, the speed of heating), the heat insulation effect of the coating can be judged. The medium described in the present invention is a heating medium, for example, oil.

[0029] When the temperature detected by the first temperature sensor 18 reaches the set temperature range, the control system controls the first electromagnetic flow valve 1 and the second electromagnetic flow valve 4 to open, so that the drilling fluid can flow through the drill pipe 16 to be tested, thereby automatically testing the thermal insulation performance of the coating inside the drill pipe, thereby avoiding human operation that causes the drilling fluid to be introduced into the drill pipe 16 to be tested before the set temperature range, or to be introduced into the drill pipe 16 after exceeding the set temperature range, causing the test temperature range of the drill pipe to be inaccurate, thereby improving the test efficiency and accuracy. In addition, by setting the set temperature range, the present invention can also perform automated testing under multiple set temperature ranges, expand the test temperature range of the thermal insulation of the coating inside the drill pipe, and improve the accuracy of the test data.

[0030] The present invention can evaluate and analyze the thermal insulation effect of the coating inside the drill pipe under indoor conditions, and further clarify the cooling ability of the coating insulation on the circulating temperature of the wellbore drilling fluid under indoor test conditions, thereby ensuring the service life of the test instruments in the drill pipe and the test accuracy, and effectively ensuring the safety of the drilling operation.

[0031] In one or more embodiments, the electromagnetic heater 13 is communicatively connected to the control system. When the first temperature sensor 18 measures that the temperature of the medium in the container 17 is higher than the set temperature range, the control system controls the electromagnetic heater 13 to stop heating the medium. When the first temperature sensor 18 measures that the temperature of the medium in the container 17 is lower than the set temperature range, the control system controls the electromagnetic heater 13 to continue heating the medium. The temperature of the medium can be maintained within the set range, thereby improving the accuracy of the test. The set temperature range can be set as needed.

[0032] In one or more embodiments, the electromagnetic heater 13 is disposed on both sides of the container 17 and is in contact with the container 17 .

[0033] In the present invention, the electromagnetic heaters 13 are arranged on both sides of the container 17 and are in contact with the container 17 , so that the container 17 can be heated evenly, which is beneficial to improving the efficiency of heating the medium inside the container 17 .

[0034] In one or more embodiments, the drill pipe inner coating automated thermal insulation testing device 100 of the present invention further includes a second temperature sensor 2 and a third temperature sensor 3 that are communicatively connected to a control system, wherein the second temperature sensor 2 is disposed on a pipe near the inlet end of the drill pipe 16 to be tested, and the third temperature sensor 3 is disposed on a pipe near the outlet end of the drill pipe 16 to be tested, and the control system is capable of recording the temperature difference between the second temperature sensor 2 and the third temperature sensor 3, and controlling the flow rate of the drilling fluid according to the temperature difference between the two.

[0035] When the pressure fed back by the first pressure sensor 11 and the second pressure sensor 9 is large, it indicates that the flow rate of the coolant to be cooled flowing out from the inside of the drill pipe 16 to be tested is large, and the control system increases the power of the condenser 8, thereby improving the condensation efficiency of the drilling fluid. When the pressure fed back by the first pressure sensor 11 and the second pressure sensor 9 is small, it indicates that the flow rate of the coolant to be cooled flowing out from the inside of the drill pipe 16 to be tested is small, and the control system reduces the power of the condenser 8, thereby avoiding wasting the power of the condenser 8.

[0036] In one or more embodiments, the drill pipe inner coating automatic insulation test device 100 of the present invention further includes a sealing ring 19, which is sleeved on the outer periphery of the drill pipe 16 to be tested and seals the contact point between the drill pipe 16 to be tested and the container 17, thereby preventing leakage of the medium. Specifically, the drill pipe inner coating automatic insulation test device 100 of the present invention includes two sealing rings 19 located in the container 17, which are respectively arranged at the position where the drill pipe 16 to be tested contacts the container 17. It should be noted that when performing the test work, the air tightness of the drill pipe inner coating automatic insulation test device 100 is first checked.

[0037] In one or more embodiments, the drill pipe inner coating automated thermal insulation testing device 100 described in the present invention also includes a first pressure sensor 11 and a second pressure sensor 9 arranged on pipes connected to both sides of the drill pipe 16 to be tested, the first pressure sensor 11 and the second pressure sensor 9 are respectively arranged on pipes connecting the inlet and outlet ends of the drill pipe 16 to be tested, the first pressure sensor 11 and the second pressure sensor 9 are respectively communicated with the control system, and the control system can control the opening of the first electromagnetic flow valve 1 and the second electromagnetic flow valve 4 according to the pressure signals fed back by the first pressure sensor 11 and the second pressure sensor 9, thereby adjusting the residence time of the drilling fluid in the drill pipe 16 to be tested, avoiding excessive or excessive small drilling fluid flow inside the drill pipe 16 to be tested, and improving the test efficiency.

[0038] like Figure 2As shown, in one or more embodiments, the automatic thermal insulation test device 100 for inner coating of drill pipes of the present invention further includes a condenser 8, a storage tank 7, and a booster pump 6. The outlet end of the drill pipe 16 to be tested is connected to the condenser 8, and the condenser 8 is connected to the storage tank 7 through a connecting pipe. The booster pump 6 is arranged in the storage tank 7 and connected to the inlet end of the drill pipe 16 to be tested through a pipe. The drilling fluid in the storage tank 7 is pumped into the interior of the drill pipe 16 to be tested by the booster pump 6, and then flows out to the condenser 8 for cooling, and finally returns to the storage tank 7.

[0039] The present invention includes a condenser 8, a storage tank 7 and a booster pump 6, the outlet end of the drill pipe 16 to be tested is connected to the condenser 8, the condenser 8 and the storage tank 7 are connected through a connecting pipe, the booster pump 6 is arranged in the storage tank 7 and is connected to the inlet end of the drill pipe 16 to be tested through a pipe, and the drilling fluid can be recycled to greatly improve the utilization rate of the drilling fluid.

[0040] In one or more embodiments, the condenser 8 is communicatively connected to a control system, and the control system can adjust the power of the condenser 8 according to the detection signals fed back by the first pressure sensor 11 and the second pressure sensor 9 .

[0041] The present invention is connected to the control system through the condenser 8 and the control system can adjust the power of the condenser 8 according to the detection signal fed back by the first pressure sensor 11 and the second pressure sensor 9. When the pressure fed back by the first pressure sensor 11 and the second pressure sensor 9 is large, it indicates that the flow rate of the coolant to be cooled flowing out from the inside of the drill pipe 16 to be tested is large, and the control system increases the power of the condenser 8, thereby improving the condensation efficiency of the drilling fluid. When the pressure fed back by the first pressure sensor 11 and the second pressure sensor 9 is small, it indicates that the flow rate of the coolant to be cooled flowing out from the inside of the drill pipe 16 to be tested is small, and the control system reduces the power of the condenser 8, thereby avoiding wasting the power of the condenser 8.

[0042] In one or more embodiments, the booster pump 6 is connected to the control system in communication, and the control system can adjust the power of the booster pump 6 according to the detection signal fed back by the first pressure sensor 11 and the second pressure sensor 9. When the pressure fed back by the first pressure sensor 11 and the second pressure sensor 9 is large, it indicates that the flow rate of the drilling fluid pumped by the booster pump 6 is large, and the control system reduces the power of the booster pump 6, thereby avoiding wasting the power of the booster pump 6. When the pressure fed back by the first pressure sensor 11 and the second pressure sensor 9 is small, it indicates that the flow rate of the drilling fluid pumped by the booster pump 6 is small, and the control system increases the power of the booster pump 6, thereby improving the test efficiency.

[0043] In one or more embodiments, the container 17 is provided with an inlet 12 for injecting the medium at the top, an outlet 14 for discharging the medium at the bottom, and a valve 15 is provided at the outlet 14. On the premise of ensuring good air tightness of the test device, the valve 15 is closed, and then the medium is added into the container 17, and then the drilling fluid is passed into the drill pipe 16 to be tested, and the electromagnetic heater 16 is started to heat the medium.

[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. An automated thermal insulation test device for inner coating of a drill pipe, comprising a container with a medium inside, a drill pipe to be tested which is arranged in the medium in the container and has a thermal insulation coating on its inner wall, an electromagnetic heater, a first temperature sensor arranged inside the container, a first electromagnetic flow valve and a second electromagnetic flow valve arranged on pipes on both sides of the drill pipe to be tested, and a control system which is communicatively connected to the first temperature sensor, the first electromagnetic flow valve and the second electromagnetic flow valve, respectively. The electromagnetic heater is used to heat the medium in the container, and the first temperature sensor is used to detect the temperature information of the medium in the container and send it to the control system. When the temperature detected by the first temperature sensor reaches a set temperature range, the control system controls the first electromagnetic flow valve and the second electromagnetic flow valve to open so that drilling fluid can flow inside the drill pipe to be tested.

2. The automatic thermal insulation testing device for inner coating of drill pipe according to claim 1, It is characterized in that The electromagnetic heater is communicatively connected to the control system. When the first temperature sensor measures that the temperature of the medium in the container is higher than a set temperature range, the control system controls the electromagnetic heater to stop heating the medium. When the first temperature sensor measures that the temperature of the medium in the container is lower than the set temperature range, the control system controls the electromagnetic heater to continue heating the medium.

3. The automatic thermal insulation testing device for inner coating of drill pipe according to claim 2, It is characterized in that The electromagnetic heaters are arranged on both sides of the container and are in contact with the container.

4. The automatic thermal insulation testing device for inner coating of drill pipe according to claim 1, It is characterized in that The medium is oil.

5. The automatic thermal insulation testing device for inner coating of drill pipe 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 automatic thermal insulation testing device for inner coating of drill pipe according to claim 1, It is characterized in that It also includes a first pressure sensor and a second pressure sensor which are arranged on the pipes on both sides of the drill pipe to be tested. The first pressure sensor and the second pressure sensor are respectively communicated with the control system. The control system can control the opening of the first electromagnetic flow valve and the second electromagnetic flow valve respectively according to the pressure signals fed back by the first pressure sensor and the second pressure sensor.

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

8. The automatic thermal insulation testing device for inner coating of drill pipe according to claim 7, It is characterized in that The condenser is in communication connection with the control system, and the control system can adjust the power of the condenser according to the detection signals fed back by the first pressure sensor and the second pressure sensor.

9. The automatic thermal insulation testing device for inner coating of drill pipe according to claim 7, It is characterized in that The boost pump is communicatively connected to the control system, and the control system can adjust the power of the boost pump according to the detection signals fed back by the first pressure sensor and the second pressure sensor.

10. The automatic thermal insulation testing device for inner coating of drill pipe 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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