Drilling fluid cooling device and method

Abstract

The invention discloses a drilling fluid cooling device and method, and relates to the technical field of drilling fluid cooling. The temperature of drilling fluid can be effectively reduced, the temperature environment of a shaft is improved, and drilling safety and efficiency are improved. The device comprises a cooling liquid module, a heat exchanger, a drilling fluid tank, a drilling fluid pump, a control unit and a detection unit, the heat exchanger comprises a heat exchanger shell, and a shunting straight pipe and a coil pipe which are arranged in the heat exchanger shell; the shunting straight pipe and the coil pipe are communicated with the cooling liquid module; the heat exchanger shell is communicated with a drilling fluid tank; the drilling fluid pump is arranged between the heat exchanger shell and the drilling fluid tank; the detection unit can collect the temperature value of the drilling fluid in the heat exchanger; the control unit is connected with the detection unit and the drilling fluid pump; the control unit can compare the received temperature value of the drilling fluid with a preset temperature value and adjust the flow of the drilling fluid pump according to the comparison result. The invention further provides a cooling method based on the cooling device.

Description

Technical Field

[0001] The present application relates to the technical field of drilling fluid cooling, and in particular to a drilling fluid cooling device and method. Background Art

[0002] During the drilling process, as the drilling depth increases, the wellbore temperature will rise rapidly, resulting in extremely high bottom hole temperatures, which will affect the performance of the drilling fluid and the normal use of downhole tools and measuring instruments. Using a ground cooling system to cool the drilling fluid is one of the main cooling technologies currently used. The ground cooling system first cools the drilling fluid on the ground, and then transports the cooled fluid to the underground to reduce the underground temperature. However, the ground cooling system generally has problems such as low heat exchange efficiency of the heat exchanger, complex operation and high cost. For example, two typical systems in the ground cooling system, the ground underground combined refrigeration and cooling system and the underground decentralized refrigeration and cooling system, have high investment costs due to the decentralized equipment and the need for explosion-proof treatment. In addition, the ground underground combined refrigeration and cooling system is mainly suitable for large mines. For small or medium-sized mines, its operation method is relatively complicated, inconvenient to operate and maintain, and therefore it is not applicable. Summary of the invention

[0003] The embodiments of the present application provide a drilling fluid cooling device and method, which can effectively reduce the temperature of the drilling fluid, improve the wellbore temperature environment, and improve drilling safety and efficiency.

[0004] To achieve the above-mentioned objectives, on the one hand, an embodiment of the present application provides a drilling fluid cooling device, comprising a coolant module, a heat exchanger, a drilling fluid tank, a drilling fluid pump, a control unit and a detection unit; the heat exchanger comprises a heat exchanger shell and a shunt straight pipe and a coil arranged in the heat exchanger shell; the shunt straight pipe and the coil are connected to the coolant module; the heat exchanger shell is connected to the drilling fluid tank; the drilling fluid pump is arranged between the heat exchanger shell and the drilling fluid tank; the detection unit can collect the temperature value of the drilling fluid in the heat exchanger; the control unit is connected to the detection unit and the drilling fluid pump; the control unit can compare the received temperature value of the drilling fluid with the preset temperature value, and adjust the flow rate of the drilling fluid pump according to the comparison result.

[0005] Furthermore, the diversion straight pipe includes an inlet connecting plate, an outlet connecting plate and a plurality of straight pipes arranged between the inlet connecting plate and the outlet connecting plate; the plurality of straight pipes are equidistantly distributed along the circumference of the inlet connecting plate; and the coil is located in a central area formed by the plurality of straight pipes.

[0006] Furthermore, there are three straight pipes in the diversion straight pipe; the inlet connecting plate is provided with three liquid inlet holes, and the outlet connecting plate is provided with three liquid discharge holes; the two ends of the three straight pipes are respectively connected with the corresponding liquid inlet holes and liquid discharge holes.

[0007] Furthermore, the coil comprises a spiral tube and a liquid inlet straight tube section and a liquid discharge straight tube section arranged at two ends of the spiral tube.

[0008] Furthermore, a drilling fluid inlet and a drilling fluid outlet are provided at both ends of the heat exchanger shell; the inlet connection plate of the diversion straight pipe is arranged close to the drilling fluid outlet of the heat exchanger shell; and the outlet connection plate of the diversion straight pipe is arranged close to the drilling fluid inlet of the heat exchanger shell.

[0009] Furthermore, the detection unit includes a first drilling fluid temperature sensor, a second drilling fluid temperature sensor, a third drilling fluid temperature sensor and a flow sensor; the first drilling fluid temperature sensor and the second drilling fluid temperature sensor are respectively arranged at both ends of the heat exchanger shell; the third drilling fluid temperature sensor is arranged on the drilling fluid tank; the flow sensor is arranged on the pipeline between the drilling fluid inlet of the heat exchanger shell and the drilling fluid tank.

[0010] Furthermore, the detection unit also includes a first coolant temperature sensor, a second coolant temperature sensor and a third coolant temperature sensor; the first coolant temperature sensor and the second coolant temperature sensor are respectively arranged at both ends of the branch straight pipe, and the third coolant temperature sensor is arranged on the coolant pool.

[0011] Furthermore, the drilling fluid pump adopts a constant flow pump; the control unit includes a frequency converter; and the frequency converter is connected to the motor of the constant flow pump.

[0012] Furthermore, the coolant module includes a refrigerant tank, a refrigerant pump and a refrigerant heat exchange device; the refrigerant tank is connected to the heat exchanger through a refrigerant inlet pipeline and a refrigerant outlet pipeline; the refrigerant pump is located on the refrigerant inlet pipeline; and the refrigerant heat exchange device is located on the refrigerant outlet pipeline.

[0013] On the other hand, an embodiment of the present application also provides a cooling method based on the above-mentioned drilling fluid cooling device, comprising the following steps: starting the coolant module and the drilling fluid pump; the detection unit collects the temperature value of the drilling fluid in the heat exchanger in real time; the control unit compares the received temperature value of the drilling fluid with the preset temperature value, and adjusts the flow rate of the drilling fluid pump according to the comparison result.

[0014] Compared with the prior art, this application has the following beneficial effects:

[0015] 1. The drilling fluid cooling device of the embodiment of the present application is provided with a diverter straight pipe and a coil in the heat exchanger shell, which optimizes the structure of the heat exchanger, increases the heat exchange area, improves the heat exchange efficiency, effectively reduces the temperature of the drilling fluid, and improves the temperature environment of the wellbore.

[0016] 2. The drilling fluid cooling device in the embodiment of the present application uses a temperature sensor and a flow sensor to monitor the fluid parameters at the inlet and outlet of the heat exchanger in real time, and controls the motor speed with a frequency converter to control the drilling fluid flow rate, thereby meeting the cooling requirements under different working conditions and improving the response speed and control accuracy of the system.

[0017] 3. The drilling fluid cooling device of the embodiment of the present application improves the stability and long-term operation capability of the drilling fluid, downhole tools and measuring instruments by lowering the temperature of the drilling fluid, thereby improving the safety and efficiency of the drilling operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 This is a schematic diagram of the structure of a drilling fluid cooling device according to an embodiment of the present application;

[0020] Figure 2 This is a cross-sectional view of a heat exchanger shell in a drilling fluid cooling device according to an embodiment of the present application;

[0021] Figure 3 This is a schematic diagram of the three-dimensional structure of the diversion straight pipe in the drilling fluid cooling device according to the embodiment of the present application;

[0022] Figure 4 It is a schematic diagram of the three-dimensional structure of the coil in the drilling fluid cooling device according to an embodiment of the present application. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0024] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0025] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, they can understand the specific meanings of the above terms in this application according to specific circumstances.

[0026] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" can explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0027] Reference Figures 1 to 4 An embodiment of the present application provides a drilling fluid cooling device, including a coolant module 1, a heat exchanger 2, a drilling fluid tank 3, a drilling fluid pump 4, a detection unit 5 and a control unit.

[0028] The coolant module 1 adopts a low-temperature constant temperature water bath, and specifically includes a coolant tank 11, a coolant pump 12, and a coolant heat exchange device 13. The coolant tank 11 is connected to the heat exchanger 2 through a coolant inlet pipeline 14 and a coolant outlet pipeline 15. The coolant pump 12 is located on the coolant inlet pipeline 14, and the coolant heat exchange device 13 is located on the coolant outlet pipeline 15.

[0029] The heat exchanger 2 includes a heat exchanger shell 21 and a branch straight pipe 22 and a coil 23 arranged in the heat exchanger shell 21 .

[0030] The heat exchanger housing 21 is a housing with tapered ends. A drilling fluid inlet 211 and a drilling fluid outlet 212 are provided at both ends of the housing. The drilling fluid inlet 211 is connected to the drilling fluid tank 3 through a drilling fluid inlet pipeline 24, and the drilling fluid outlet 212 is connected to the drilling fluid tank 3 through a drilling fluid outlet pipeline 25. The drilling fluid pump 4 is provided on the drilling fluid inlet pipeline 24. The drilling fluid pump 4 is a constant flow pump.

[0031] The shunt straight pipe 22 includes an inlet connection plate 231, an outlet connection plate (not shown) and three straight pipes 233 arranged between the inlet connection plate 231 and the outlet connection plate. The three straight pipes 233 are equidistantly distributed along the circumference of the inlet connection plate 231. The length of the straight pipe 233 is 2 meters and the inner diameter is 10 mm. The inlet connection plate 231 is provided with three liquid inlet holes, and the outlet connection plate is provided with three liquid discharge holes. The two ends of the three straight pipes 233 are respectively connected to the corresponding liquid inlet holes and liquid discharge holes. The liquid inlet hole is connected to the refrigerant pump 12 through the refrigerant inlet pipeline 14. The liquid discharge hole is connected to the refrigerant heat exchange device 13 through the refrigerant outlet pipeline 15.

[0032] The coil 23 includes a spiral tube and a liquid inlet straight pipe section and a liquid discharge straight pipe section arranged at both ends of the spiral tube. The unfolded length of the coil 23 is 10 meters and the inner diameter is 10 mm. The coil 23 is located in the central area formed by the three straight pipes 233, and the center line of the coil 23 coincides with the center line of the diversion straight pipe 22. The liquid inlet straight pipe section of the coil 23 is also connected to the coolant pump 12 through the coolant inlet pipeline 14, and the liquid discharge straight pipe section is also connected to the coolant heat exchange device 13 through the coolant outlet pipeline 15.

[0033] The liquid inlet of the diverter straight pipe 22 is arranged close to the drilling fluid outlet 212 of the heat exchanger shell 21, and the liquid discharge hole of the diverter straight pipe 22 is arranged close to the drilling fluid inlet 211 of the heat exchanger shell 21, that is, in the heat exchanger 2, the flow direction of the coolant is opposite to the flow direction of the drilling fluid, which can enhance the heat exchange efficiency.

[0034] The detection unit 5 includes a first drilling fluid temperature sensor 51, a second drilling fluid temperature sensor 52, a third drilling fluid temperature sensor 53, a flow sensor 54, a first coolant temperature sensor 55, a second coolant temperature sensor 56 and a third coolant temperature sensor 57. All sensors are high-precision sensors that can monitor the fluid parameters at the inlet and outlet of the heat exchanger in real time, such as temperature, pressure, flow, etc., and can also record all key operating parameters and cooling effect data using the computer data acquisition module in the control unit.

[0035] The first drilling fluid temperature sensor 51 and the second drilling fluid temperature sensor 52 are respectively arranged at both ends of the heat exchanger housing 21, and are used to collect the temperature value of the drilling fluid in the heat exchanger 2. The third drilling fluid temperature sensor 53 is arranged on the drilling fluid tank 3, and is used to collect the temperature value of the drilling fluid in the drilling fluid tank 3. The flow sensor 54 is arranged on the pipeline between the drilling fluid inlet 211 of the heat exchanger housing 21 and the drilling fluid tank 3, and is used to collect the flow rate of the drilling fluid in the drilling fluid inlet pipeline 24 in real time. The drilling fluid inlet pipeline 24 is also provided with a pressure relief valve 58, which can ensure the safety of the pipeline.

[0036] The first coolant temperature sensor 55 and the second coolant temperature sensor 56 are respectively arranged at the two ends of the diversion straight pipe 22, and are used to collect the temperature value of the coolant in the heat exchanger 2. The third drilling fluid temperature sensor 53 is arranged on the coolant tank 11, and is used to collect the temperature value of the drilling fluid in the coolant tank 11.

[0037] The control unit is connected to both the detection unit 5 and the drilling fluid pump 4. The control unit can compare the temperature value of the drilling fluid in the heat exchanger 2 received with the preset temperature value, and adjust the flow rate of the drilling fluid pump 4 according to the comparison result. The control unit includes a frequency converter 6, which is connected to the motor of the drilling fluid pump 4. The frequency converter 6 can adjust the speed of the motor in the drilling fluid pump 4, thereby adjusting the flow rate of the drilling fluid pump 4. The preset temperature value is the target temperature value that the drilling fluid needs to be reduced.

[0038] On the other hand, an embodiment of the present application further provides a cooling method based on the above-mentioned drilling fluid cooling device, comprising the following steps:

[0039] S1. Manually collect drilling fluid data and pre-process the drilling fluid data; the drilling fluid data includes data such as drilling fluid temperature and flow rate.

[0040] S2, debugging the coolant module 1 so that the temperature of the coolant inside reaches the required low temperature state;

[0041] S3, start the coolant module 1, ensure that the coolant circulation system works normally, start the drilling fluid pump 4, and pump the drilling fluid that needs to be cooled into the heat exchanger 2 at a predetermined speed.

[0042] S4, the detection unit 5 collects the temperature values ​​of the coolant and the drilling fluid at the inlet and outlet of the heat exchanger, as well as the flow rate and pressure of the drilling fluid entering the heat exchanger 2 in real time.

[0043] S5. The control unit compares the received temperature value of the drilling fluid with the preset temperature value, and adjusts the control inverter 6 to adjust the flow rate of the drilling fluid pump 4 according to the comparison result, and uses the computer data acquisition module to record all key operating parameters and cooling effect data.

[0044] S6. After the operation is completed, shut down all equipment, clean the pipelines, and process the data.

[0045] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A drilling fluid cooling device, characterized in that: It includes a coolant module, a heat exchanger, a drilling fluid tank, a drilling fluid pump, a control unit and a detection unit; the heat exchanger includes a heat exchanger shell and a shunt straight pipe and a coil arranged in the heat exchanger shell; the shunt straight pipe and the coil are connected to the coolant module; the heat exchanger shell is connected to the drilling fluid tank; the drilling fluid pump is arranged between the heat exchanger shell and the drilling fluid tank; the detection unit can collect the temperature value of the drilling fluid in the heat exchanger; the control unit is connected to the detection unit and the drilling fluid pump; the control unit can compare the received temperature value of the drilling fluid with the preset temperature value, and adjust the flow rate of the drilling fluid pump according to the comparison result.

2. The drilling fluid cooling device according to claim 1, characterized in that: The diversion straight pipe comprises an inlet connection plate, an outlet connection plate and a plurality of straight pipes arranged between the inlet connection plate and the outlet connection plate; the plurality of straight pipes are evenly distributed along the circumference of the inlet connection plate; and the coil is located in a central area formed by the plurality of straight pipes.

3. The drilling fluid cooling device according to claim 2, characterized in that: There are three straight pipes in the diversion straight pipe; the inlet connection plate is provided with three liquid inlet holes, and the outlet connection plate is provided with three liquid discharge holes; the two ends of the three straight pipes are respectively connected with the corresponding liquid inlet holes and liquid discharge holes.

4. The drilling fluid cooling device according to claim 1, characterized in that: The coil comprises a spiral tube and a liquid inlet straight tube section and a liquid discharge straight tube section arranged at two ends of the spiral tube.

5. The drilling fluid cooling device according to claim 2, characterized in that: The heat exchanger shell is provided with a drilling fluid inlet and a drilling fluid outlet at both ends; the inlet connection plate of the diverter straight pipe is arranged close to the drilling fluid outlet of the heat exchanger shell; the outlet connection plate of the diverter straight pipe is arranged close to the drilling fluid inlet of the heat exchanger shell.

6. The drilling fluid cooling device according to claim 5, characterized in that: The detection unit includes a first drilling fluid temperature sensor, a second drilling fluid temperature sensor, a third drilling fluid temperature sensor and a flow sensor; the first drilling fluid temperature sensor and the second drilling fluid temperature sensor are respectively arranged at both ends of the heat exchanger shell; the third drilling fluid temperature sensor is arranged on the drilling fluid tank; the flow sensor is arranged on the pipeline between the drilling fluid inlet of the heat exchanger shell and the drilling fluid tank.

7. The drilling fluid cooling device according to claim 6, characterized in that: The detection unit also includes a first coolant temperature sensor, a second coolant temperature sensor and a third coolant temperature sensor; the first coolant temperature sensor and the second coolant temperature sensor are respectively arranged at both ends of the shunt straight pipe, and the third coolant temperature sensor is arranged on the coolant pool.

8. The drilling fluid cooling device according to claim 7, characterized in that: The drilling fluid pump adopts a constant flow pump; the control unit includes a frequency converter; the frequency converter is connected to the motor of the constant flow pump.

9. The drilling fluid cooling device according to claim 8, characterized in that: The coolant module includes a refrigerant tank, a refrigerant pump and a refrigerant heat exchange device; the refrigerant tank is connected to the heat exchanger through a refrigerant inlet pipeline and a refrigerant outlet pipeline; the refrigerant pump is located on the refrigerant inlet pipeline; and the refrigerant heat exchange device is located on the refrigerant outlet pipeline.

10. A cooling method based on the drilling fluid cooling device according to any one of claims 1 to 9, characterized in that: The following steps are involved: Start the coolant module and drilling fluid pump; The detection unit collects the temperature value of the drilling fluid in the heat exchanger in real time; The control unit compares the received temperature value of the drilling fluid with a preset temperature value, and adjusts the flow rate of the drilling fluid pump according to the comparison result.

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