Polar region drilling mud temperature control system, method and controller

Abstract

The invention relates to the field of polar region oil and gas development, and discloses a polar region drilling mud temperature control system and method and a controller. The system comprises a slurry backflow module, a flow divider valve, a stop valve, a flow divider pump, a natural cooling pipeline, a heat preservation pipeline, a flow collecting valve, a slurry circulation module and a controller. The input end of the diverter valve is connected with the slurry output end of the polar shaft through the slurry backflow module, the first output end of the diverter valve is connected with the first input end of the collecting valve sequentially through the stop valve, the diverter pump and the natural cooling pipeline, and the second output end of the diverter valve is connected with the second input end of the collecting valve through the heat preservation pipeline. The output end of the flow collecting valve is connected with the slurry input end of the polar region shaft through the slurry circulation module. When it is determined that the first slurry temperature in the slurry backflow module is larger than the maximum allowable temperature, the rotating speed of the flow dividing pump is controlled, the slurry flow in the natural cooling pipeline and the heat preservation pipeline is distributed, the drilling slurry is cooled, the cooling precision is improved, and cooling of the drilling slurry is effectively achieved.

Description

Technical Field

[0001] The present invention relates to the field of polar oil and gas development, and in particular to a polar drilling mud temperature control system, method and controller. Background Art

[0002] Oil and gas production in polar regions faces the challenge of extreme cold, which affects the mechanical structure of the drilling system. As a key equipment in the drilling process, the drilling mud circulation system plays an important role in maintaining the internal pressure of the wellbore and preventing blowout and leakage accidents.

[0003] In the polar region's perennially low temperature environment, the density and rheology of drilling mud will change, affecting wellbore cleaning efficiency, well pressure control, well wall stability, and cuttings transportation, thus affecting drilling safety. At the same time, high bottom-hole temperatures may cause the temperature of the drilling mud to be too high, affecting the working performance of the drilling mud. However, related technologies cannot effectively cool the drilling mud. Summary of the invention

[0004] The present invention provides a polar drilling mud temperature control system, method and controller, which are used to solve the defect that the related technology cannot effectively realize the cooling of the drilling mud, cool the drilling mud and improve the cooling accuracy, so as to effectively realize the cooling of the drilling mud.

[0005] In a first aspect, the present invention provides a polar drilling mud temperature control system, the system comprising: a mud return module, a diverter valve, a stop valve, a diverter pump, a natural cooling pipeline, an insulation pipeline, a collecting valve, a mud circulation module and a controller; The input end of the diverter valve is connected to the mud output end of the polar wellbore through the mud return module, the first output end of the diverter valve is connected to the first input end of the collecting valve through the stop valve, the diverter pump, and the natural cooling pipeline in sequence, and the second output end of the diverter valve is connected to the second input end of the collecting valve through the insulation pipeline; The output end of the collecting valve is connected to the mud input end of the polar wellbore through the mud circulation module; The controller is communicatively connected to the mud return module, the shut-off valve, the shunt pump and the mud circulation module, and is used to determine that the first mud temperature in the mud return module is greater than the maximum allowable temperature, and then control the rotation speed of the shunt pump to distribute the mud flow in the natural cooling pipe and the insulation pipe to cool the drilling mud.

[0006] Optionally, the mud return module includes: a mud cleaning module, a return pump and a first temperature sensor; The input end of the diverter valve is connected to the mud output end of the polar wellbore through the reflux pump and the mud cleaning module in sequence; The first temperature sensor is disposed on a pipeline between the input end of the diverter valve and the reflux pump. The first temperature sensor is communicatively connected to the controller and is used to detect the first mud temperature and transmit the temperature to the controller.

[0007] Optionally, the mud circulation module includes: a second temperature sensor, a mud pool and a mud transport module; The output end of the collecting valve is connected to the mud input end of the polar wellbore through the mud pool and the mud delivery module in sequence; The second temperature sensor is disposed on a pipeline between the output end of the collecting valve and the mud pool, and is communicatively connected to the controller, and is used to detect the second mud temperature in the mud circulation module and transmit it to the controller; The controller is also used to control the rotation speed of the diverter pump according to the temperature deviation between the second mud temperature and the expected temperature, so as to transport the drilling mud from the diverter valve to the natural cooling pipe and the insulation pipe, and distribute the mud flow in the natural cooling pipe and the insulation pipe to cool the drilling mud.

[0008] Optionally, the system further comprises: a first reversing valve, a heater and a second reversing valve; The input end of the first reversing valve is connected to the output end of the mud return module, the first output end of the first reversing valve is connected to the first input end of the second reversing valve through the heater, and the second output end of the first reversing valve is connected to the input end of the diverter valve; The second input end of the second reversing valve is connected to the output end of the collecting valve, and the output end of the second reversing valve is connected to the mud input end of the polar wellbore through the mud circulation module; The heater is communicatively connected to the controller; The controller is also used to determine that the first mud temperature is lower than the lowest allowable temperature, then all the drilling mud in the mud return module is transported through the heater, and the heater is controlled to heat the drilling mud flowing through.

[0009] In a second aspect, the present invention provides a method for controlling temperature of polar drilling mud, which is applied to the system proposed in the first aspect, wherein a controller in the system is communicatively connected to a mud return module, a stop valve, a diversion pump and a mud circulation module; The method comprises: The controller obtains a first mud temperature in the mud return module; The controller determines that the first mud temperature is greater than the maximum allowable temperature, and then controls the shut-off valve and the diversion pump to be in an open state, so that the drilling mud in the mud return module is transported through the natural cooling pipe and the insulation pipe; The controller determines a temperature deviation between a second mud temperature in the mud circulation module and a desired temperature; wherein the desired temperature is greater than a minimum allowable temperature and less than the maximum allowable temperature; The controller controls the rotation speed of the shunt pump according to the temperature deviation, so that the shunt pump distributes the mud flow in the natural cooling pipe and the insulation pipe, insulates the drilling mud in the insulation pipe, and cools the drilling mud in the natural cooling pipe.

[0010] Optionally, the system further comprises: a first reversing valve, a heater and a second reversing valve; The input end of the first reversing valve is connected to the output end of the mud return module, the first output end of the first reversing valve is connected to the first input end of the second reversing valve through the heater, and the second output end of the first reversing valve is connected to the input end of the diverter valve; The second input end of the second reversing valve is connected to the output end of the collecting valve, and the output end of the second reversing valve is connected to the mud input end of the polar wellbore through the mud circulation module; After the controller acquires the first mud temperature in the mud return module, the method further includes: The controller determines that the first mud temperature is less than the minimum allowable temperature, then controls the stop valve and the diverter pump to be in a closed state, controls the first reversing valve and the second reversing valve to be in an energized state, so that the first output end of the first reversing valve is in an open state, the second output end of the first reversing valve is in a closed state, the first input end of the second reversing valve is in an open state, and the second input end of the second reversing valve is in a closed state, and starts the heater, and controls the power of the heater according to the temperature deviation between the second mud temperature in the mud circulation module and the expected temperature, so that all the drilling mud in the mud return module is transported through the heater, and the drilling mud flowing through the heater is heated; Wherein, the minimum allowable temperature is lower than the expected temperature.

[0011] Optionally, controlling the shut-off valve and the diversion pump to be in an open state so that the drilling mud in the mud return module is transported through the natural cooling pipe and the insulation pipe includes: The controller controls the stop valve and the diverter pump to be in an open state, and controls the first reversing valve and the second reversing valve to be in a power-off state, so that the first output end of the first reversing valve is in a closed state, the second output end of the first reversing valve is in an open state, the first input end of the second reversing valve is in a closed state, and the second input end of the second reversing valve is in an open state, so that the drilling mud in the mud return module is transported through the natural cooling pipe and the insulation pipe.

[0012] Optionally, after the controller acquires the first mud temperature in the mud return module, the method further includes: When the controller determines that the first mud temperature is not less than the minimum allowable temperature and not greater than the maximum allowable temperature, the stop valve and the diversion pump are controlled to be in a closed state, and the first reversing valve and the second reversing valve are controlled to be in a power-off state, so that the first output end of the first reversing valve is in a closed state, the second output end of the first reversing valve is in an open state, the first input end of the second reversing valve is in a closed state, and the second input end of the second reversing valve is in an open state, so that all the drilling mud in the mud return module is transported through the insulated pipe.

[0013] Optionally, the controller controls the rotation speed of the shunt pump according to the temperature deviation, including: The controller determines a temperature deviation change rate corresponding to the temperature deviation; The controller searches for the corresponding target speed in a preset variable domain fuzzy control rule table according to the determined temperature deviation and temperature deviation change rate; The controller generates a speed control signal according to the target speed and sends the signal to the shunt pump to adjust the speed of the shunt pump to the target speed.

[0014] In a third aspect, the present invention provides a controller, which is applied to the system provided in the first aspect, wherein the controller is communicatively connected to a mud return module, a stop valve, a diversion pump and a mud circulation module; The controller comprises: An acquisition unit, used for acquiring a first mud temperature in the mud return module; an opening unit, for determining that the first mud temperature is greater than the maximum allowable temperature, and then controlling the shut-off valve and the diversion pump to be in an open state, so that the drilling mud in the mud return module is transported through the natural cooling pipe and the insulation pipe; A determination unit, configured to determine a temperature deviation between a second mud temperature in the mud circulation module and an expected temperature; wherein the expected temperature is greater than a minimum allowable temperature and less than a maximum allowable temperature; A control unit is used to control the rotation speed of the shunt pump according to the temperature deviation, so that the shunt pump distributes the mud flow in the natural cooling pipe and the insulation pipe, insulates the drilling mud in the insulation pipe, and cools the drilling mud in the natural cooling pipe.

[0015] The polar drilling mud temperature control system, method and controller provided by the present invention include a mud return module, a diverter valve, a stop valve, a diverter pump, a natural cooling pipeline, an insulation pipeline, a collecting valve, a mud circulation module and a controller. The input end of the diverter valve is connected to the mud output end of the polar wellbore through the mud return module, the first output end of the diverter valve is connected to the first input end of the collecting valve through the stop valve, the diverter pump and the natural cooling pipeline in turn, and the second output end of the diverter valve is connected to the second input end of the collecting valve through the insulation pipeline. The output end of the collecting valve is connected to the mud input end of the polar wellbore through the mud circulation module. The present invention can determine that the first mud temperature in the mud return module is greater than the maximum allowable temperature, and then control the rotation speed of the diverter pump to distribute the mud flow in the natural cooling pipeline and the insulation pipeline, cool the drilling mud, improve the cooling accuracy of the drilling mud, and effectively achieve the cooling of the drilling mud. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A schematic structural diagram of a polar drilling mud temperature control system provided by an embodiment of the present invention; Figure 2 A schematic structural diagram of another polar drilling mud temperature control system provided by an embodiment of the present invention; Figure 3 A flow chart of a polar drilling mud temperature control method provided by an embodiment of the present invention; Figure 4 A flow chart of another polar drilling mud temperature control method provided by an embodiment of the present invention; Figure 5 A schematic diagram of a variable domain fuzzy control process provided by an embodiment of the present invention; Figure 6 A schematic diagram of the structure of a controller provided by an embodiment of the present invention; Figure 7 A schematic diagram of the structure of a computer device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] In order to solve the problem that the relevant technology cannot effectively cool the drilling mud, this embodiment proposes a polar drilling mud temperature control system, method and controller, which includes a mud return module, a diverter valve, a stop valve, a diverter pump, a natural cooling pipeline, an insulation pipeline, a collecting valve, a mud circulation module and a controller. The input end of the diverter valve is connected to the mud output end of the polar wellbore through the mud return module, the first output end of the diverter valve is connected to the first input end of the collecting valve through the stop valve, the diverter pump and the natural cooling pipeline in turn, and the second output end of the diverter valve is connected to the second input end of the collecting valve through the insulation pipeline. The output end of the collecting valve is connected to the mud input end of the polar wellbore through the mud circulation module. In this embodiment, if the first mud temperature in the mud return module is determined to be greater than the maximum allowable temperature, the rotation speed of the diverter pump is controlled to distribute the mud flow in the natural cooling pipeline and the insulation pipeline, the drilling mud is cooled, the cooling accuracy of the drilling mud is improved, and the cooling of the drilling mud is effectively achieved.

[0020] Combine the following Figure 1-Figure 5 The polar drilling mud temperature control system of the present invention is described.

[0021] like Figure 1 As shown, this embodiment proposes a first polar drilling mud temperature control system, the system includes: a mud return module, a diverter valve, a stop valve, a diverter pump, a natural cooling pipeline, an insulation pipeline, a collecting valve, a mud circulation module and a controller; The input end of the diverter valve is connected to the mud output end of the polar wellbore through the mud return module, the first output end of the diverter valve is connected to the first input end of the collecting valve through the stop valve, the diverter pump, and the natural cooling pipeline in sequence, and the second output end of the diverter valve is connected to the second input end of the collecting valve through the insulation pipeline; The output end of the collecting valve is connected to the mud input end of the polar wellbore through the mud circulation module; The controller is communicatively connected to the mud return module, the shut-off valve, the shunt pump and the mud circulation module, and is used to determine that the first mud temperature in the mud return module is greater than the maximum allowable temperature, and then control the rotation speed of the shunt pump to distribute the mud flow in the natural cooling pipe and the insulation pipe to cool the drilling mud.

[0022] The mud return module can be used to receive the drilling mud returned from the polar wellbore and transmit the drilling mud to realize the recycling of the drilling mud. It should be noted that the mud return module can pre-set a target mud flow rate, receive and transmit the drilling mud based on the target mud flow rate, and control the mud flow rate in the mud return module to maintain the target mud flow rate.

[0023] The natural cooling pipe may be a pipe for naturally cooling the drilling mud flowing through it. The heat-insulating pipe may be a pipe for heat-insulating the drilling mud flowing through it.

[0024] Specifically, the mud circulation module can be used to store drilling mud and transport drilling mud to polar wellbores.

[0025] Optionally, the controller may be a controller that uses a set control algorithm to perform temperature control.

[0026] The first mud temperature may be the temperature of the drilling mud in the mud return module.

[0027] The maximum allowable temperature may be the highest temperature in the normal operating temperature range of the drilling mud, and may be set by technicians according to actual conditions, and is not limited in this embodiment.

[0028] It is understandable that in this embodiment, the judgment result of whether the first mud temperature is greater than the maximum allowable temperature can be used as a control basis for whether to cool the drilling mud.

[0029] Specifically, the mud return module can collect the first mud temperature and send it to the controller. The controller determines whether the first mud temperature is greater than the maximum allowable temperature. If it is determined that the first mud temperature is greater than the maximum allowable temperature, it can be determined that the temperature of the drilling mud from the polar wellbore is too high and needs to be cooled. At this time, the controller can control the shut-off valve and the diverter pump to be in an open state, so that the drilling mud from the mud return module is transported to the natural cooling pipe and the insulation pipe through the diverter valve for cooling. At this time, the drilling mud flowing through the natural cooling pipe will exchange heat with the outside world and cool down naturally, while the drilling mud flowing through the insulation pipe will be insulated. If it is determined that the first mud temperature is not greater than the maximum allowable temperature, it can be determined that the temperature of the drilling mud from the polar wellbore is not too high and no cooling treatment is required.

[0030] Specifically, the mud circulation module can collect the mud temperature in the mud circulation module, and send the mud temperature as the second mud temperature to the controller. The controller can calculate the temperature deviation between the second mud temperature and the expected temperature range, and control the speed of the shunt pump according to the temperature deviation, so that the shunt pump can transport the drilling mud from the shunt valve to the natural cooling pipe and the insulation pipe, and distribute the mud flow in the natural cooling pipe and the insulation pipe. After that, the drilling mud is collected from the natural cooling pipe and the insulation pipe into the collecting valve for further transmission.

[0031] It should be noted that the controller can achieve the flow distribution of the drilling mud in the natural cooling pipe and the insulation pipe by controlling the rotation speed of the shunt pump, and then achieve the control of the cooling range of the drilling mud in the system. Specifically, when the rotation speed of the shunt pump is relatively high, the flow rate of the drilling mud in the natural cooling pipe is relatively high, the flow rate of the drilling mud in the natural cooling pipe is relatively high, the heat exchange efficiency with the outside is relatively high, the natural cooling rate is relatively high, and the cooling range of the drilling mud is relatively high. When the rotation speed of the shunt pump is relatively low, the flow rate of the drilling mud in the natural cooling pipe is relatively low, the flow rate of the drilling mud in the natural cooling pipe is relatively high, the heat exchange efficiency with the outside is relatively low, the natural cooling rate is relatively low, and the cooling range of the drilling mud is relatively low.

[0032] Among them, this embodiment utilizes the polar low temperature environment and natural cooling pipes to cool the hot drilling mud, and accurately adjusts the fluid temperature by diversion, which can avoid the shortcomings of inaccurate temperature caused by fixed cooling of condensers in related technologies, and avoid the shortcomings of energy consumption and emissions caused by cooling of refrigeration units in related technologies. It has the characteristics of standardized design, environmental protection, convenience and precise control, ensuring the environmentally friendly and safe development of polar drilling.

[0033] It is understandable that the diverter valve, diverter pump, natural cooling pipe, insulation pipe and collecting valve in this embodiment can constitute a cooling module. If a natural cooling pipe is set separately in the cooling module, since the passive cooling effect of the natural cooling pipe is relatively fixed, if all the drilling mud is cooled through the natural cooling pipe, the cooling range may be too large, and the cooling control accuracy is low. Therefore, in this embodiment, another pipe can be added to the cooling module to divert the drilling mud, so as to achieve cooling of only part of the drilling mud and increase the adjustable temperature range of the system. Specifically, in this embodiment, the drilling mud can be transported to the natural cooling pipe and the insulation pipe through the diverter valve, the hot mud flowing through the natural cooling pipe is cooled, and the hot mud flowing through the insulation pipe is kept warm. The flow ratio and volume ratio of insulation and cooling are adjusted according to the temperature feedback from the mud circulation module, and then the insulation fluid and the cooling fluid are mixed after passing through the collecting valve, and the temperature of the fluid is accurately reduced, that is, the fluid temperature is accurately adjusted, so as to improve the accuracy of the cooling control of the drilling mud in the system.

[0034] Optionally, the mud return module includes: a mud cleaning module, a return pump and a first temperature sensor; The input end of the diverter valve is connected to the mud output end of the polar wellbore through the return pump and the mud cleaning module in turn; The first temperature sensor is arranged on a pipeline between the input end of the diverter valve and the reflux pump. The first temperature sensor is communicatively connected to the controller and is used for detecting the first mud temperature and transmitting it to the controller.

[0035] Among them, the mud cleaning module can be used to clean the return mud in the polar wellbore.

[0036] Specifically, in this embodiment, a target mud flow rate may be pre-set for the reflux pump, and the rotation speed of the reflux pump may be set based on the target mud flow rate, so as to control the mud flow rate in the reflux pump to be maintained at the target mud flow rate.

[0037] The first temperature sensor is used to detect the temperature of the drilling mud returning from the polar wellbore.

[0038] Optionally, the mud circulation module includes: a second temperature sensor, a mud pool and a mud delivery module; The output end of the collecting valve is connected to the mud input end of the polar wellbore through the mud pool and the mud delivery module in turn; The second temperature sensor is arranged on the pipeline between the output end of the collecting valve and the mud pool, and is communicatively connected to the controller, and is used to detect the second mud temperature in the mud circulation module and transmit it to the controller; The controller is also used to control the rotation speed of the diverter pump according to the temperature deviation between the second mud temperature and the desired temperature, so as to transport the drilling mud from the diverter valve to the natural cooling pipe and the insulation pipe, and distribute the mud flow in the natural cooling pipe and the insulation pipe to cool the drilling mud.

[0039] The mud pool can be used to store drilling mud and to perform corresponding pretreatment on the drilling mud to achieve recycling of the drilling mud.

[0040] The second temperature sensor may be used to detect the temperature of the drilling mud after being heated, cooled or kept warm.

[0041] The polar drilling mud temperature control system proposed in this embodiment includes a mud return module, a diverter valve, a stop valve, a diverter pump, a natural cooling pipeline, an insulation pipeline, a collecting valve, a mud circulation module and a controller. The input end of the diverter valve is connected to the mud output end of the polar wellbore through the mud return module, the first output end of the diverter valve is connected to the first input end of the collecting valve through the stop valve, the diverter pump and the natural cooling pipeline in turn, and the second output end of the diverter valve is connected to the second input end of the collecting valve through the insulation pipeline. The output end of the collecting valve is connected to the mud input end of the polar wellbore through the mud circulation module. In this embodiment, if it is determined that the first mud temperature in the mud return module is greater than the maximum allowable temperature, the rotation speed of the diverter pump is controlled to distribute the mud flow in the natural cooling pipeline and the insulation pipeline, cool the drilling mud, improve the cooling accuracy of the drilling mud, and effectively achieve the cooling of the drilling mud.

[0042] like Figure 2 As shown, this embodiment proposes a second polar drilling mud temperature control system, which also includes: a first reversing valve, a heater and a second reversing valve.

[0043] The input end of the first reversing valve is connected to the output end of the mud return module, the first output end of the first reversing valve is connected to the first input end of the second reversing valve through the heater, and the second output end of the first reversing valve is connected to the input end of the diverter valve; The second input end of the second reversing valve is connected to the output end of the collecting valve, and the output end of the second reversing valve is connected to the mud input end of the polar wellbore through the mud circulation module; The heater is communicatively connected to the controller; The controller is also used to determine that the first mud temperature is less than the minimum allowable temperature, then all the drilling mud in the mud return module is transported through the heater, and the heater is controlled to heat the drilling mud flowing through.

[0044] like Figure 2 As shown, the wellbore refers to the polar wellbore. The mud return module may include a mud cleaning device, a pump 1 and a temperature sensor 1. The mud cleaning device, the pump 1 and the temperature sensor 1 may refer to the mud cleaning module, the return pump and the first temperature sensor, respectively.

[0045] The electric gate valve, pump 2 and cooling pipeline may refer to the above-mentioned stop valve, diverter pump and natural cooling pipeline respectively.

[0046] The mud circulation module may include a temperature sensor 2, a mud pool and a mud delivery module. The temperature sensor 2 may refer to a second temperature sensor.

[0047] It should be noted that the variable universe fuzzy controller can refer to the above controller. Figure 1 The dotted line in the figure represents the controller, and the direction of the arrow represents the flow direction of the drilling mud.

[0048] The electromagnetic reversing valve 1 and the electromagnetic reversing valve 2 refer to a first reversing valve and a second reversing valve, respectively. Specifically, the first reversing valve and the second reversing valve may be two-position three-way electromagnetic reversing valves.

[0049] Specifically, this embodiment can be Figure 1 Based on the system shown in the figure, a first reversing valve, a second reversing valve and a heater are added to construct a heating pipeline for heating the drilling mud. Figure 2 As shown, in this embodiment, an electromagnetic reversing valve 1, a heater and an electromagnetic reversing valve 2 can be added to construct a heating pipeline independent of the cooling pipeline and the insulation pipeline.

[0050] It is understandable that, relative to Figure 1 The system shown, Figure 2 The mud return module is no longer directly connected to the diverter valve 1, but is connected to the diverter valve 1 through the electromagnetic reversing valve 1. Specifically, the output end of the mud return module is connected to the input end of the electromagnetic reversing valve 1 (i.e., the first reversing valve), the first output end of the electromagnetic reversing valve 1 is connected to the first input end of the second reversing valve through the heater, and the second output end of the electromagnetic reversing valve 1 is connected to the input end of the diverter valve 1. The collecting valve 1 is no longer directly connected to the mud circulation module, but is connected to the mud circulation module through the electromagnetic reversing valve 2. Specifically, the output end of the collecting valve 1 is connected to the second input end of the electromagnetic reversing valve 2 (i.e., the second reversing valve), and the output end of the second reversing valve is connected to the mud input end of the wellbore (i.e., the polar wellbore) through the mud circulation module.

[0051] Specifically, Figure 2 As shown, when the second reversing valve and the first reversing valve are both two-position three-way electromagnetic reversing valves, the second reversing valve and the first reversing valve can be in the power-off state or in the power-on state at the same time.

[0052] Specifically, this embodiment can first determine whether to heat, cool or keep the drilling mud warm based on the first mud temperature detected by the first temperature sensor, and then control the state of related equipment to heat, cool or keep the drilling mud warm.

[0053] Specifically, when it is determined that the first mud temperature is less than the minimum allowable temperature, the embodiment can control the stop valve and the diverter pump to be in a closed state, control the first reversing valve and the second reversing valve to be in an energized state, so that the first output end of the first reversing valve is in an open state, the second output end of the first reversing valve is in a closed state, the first input end of the second reversing valve is in an open state, and the second input end of the second reversing valve is in a closed state (the drilling mud flows from the polar wellbore, the mud return module, the first reversing valve, the heater, the second reversing valve, the mud circulation module to the polar wellbore in sequence), and start the heater, and control the power of the heater according to the temperature deviation between the second mud temperature in the mud circulation module and the desired temperature, so that all the drilling mud in the mud return module is transported through the heater, and the drilling mud flowing through the heater is heated. Among them, the minimum allowable temperature is less than the desired temperature.

[0054] Specifically, in this embodiment, when it is determined that the first mud temperature is greater than the maximum allowable temperature, the stop valve and the diverter pump are controlled to be in an open state, and the first reversing valve and the second reversing valve are controlled to be in a power-off state, so that the first output end of the first reversing valve is in a closed state, the second output end of the first reversing valve is in an open state, the first input end of the second reversing valve is in a closed state, and the second input end of the second reversing valve is in an open state (the drilling mud flow direction at this time is sequentially from the polar wellbore, the mud return module, the first reversing valve, the diverter valve, the diverter pump, the natural cooling cooling pipe, insulation pipe, collecting valve, second reversing valve, mud circulation module to polar wellbore), so that the drilling mud in the mud return module is transported through the natural cooling pipe and the insulation pipe, and at the same time, the rotation speed of the shunt pump can be controlled according to the temperature deviation between the second mud temperature in the mud circulation module and the expected temperature, so that the shunt pump distributes the mud flow in the natural cooling pipe and the insulation pipe, insulates the drilling mud flowing through the insulation pipe, cools the drilling mud flowing through the natural cooling pipe, increases the cooling range, and improves the cooling accuracy.

[0055] Specifically, when it is determined that the first mud temperature is not less than the minimum allowable temperature and not greater than the maximum allowable temperature, this embodiment can control the shut-off valve and the diverter pump to be in a closed state, and control the first reversing valve and the second reversing valve to be in a power-off state, so that the first output end of the first reversing valve is in a closed state, the second output end of the first reversing valve is in an open state, the first input end of the second reversing valve is in a closed state, and the second input end of the second reversing valve is in an open state (the drilling mud flows in the polar wellbore, the mud return module, the first reversing valve, the insulation pipe, the collecting valve, the second reversing valve, the mud circulation module to the polar wellbore in sequence), so that all the drilling mud in the mud return module is transported through the insulation pipe.

[0056] It should be noted that in order to avoid unnecessary activation of the heater, reduce energy consumption, and avoid overheating of the heater and potential safety hazards, the present embodiment can also control the heater to be in an off state when it is determined that the first mud temperature is not lower than the minimum allowable temperature.

[0057] It can be understood that, compared with setting only a fixed temperature for determining whether to heat, cool or keep warm, the present embodiment sets the minimum allowable temperature and the maximum allowable temperature, compares the relationship between the first mud temperature and the minimum allowable temperature, or compares the relationship between the first mud temperature and the maximum allowable temperature, and then determines whether to heat, cool or keep warm, which can avoid frequent opening or closing of the heater and reduce the risk of heater failure.

[0058] The polar drilling mud temperature control system proposed in this embodiment can compare the size relationship between the first mud temperature and the minimum allowable temperature, or compare the size relationship between the first mud temperature and the maximum allowable temperature, and then determine whether to heat, cool or keep warm, effectively realize the temperature control of the drilling mud, improve the accuracy of the mud temperature control, and ensure that the drilling mud temperature is within a reasonable range. This embodiment can perform temperature control after the drilling mud is returned to ensure that the drilling mud is kept within a suitable working temperature range when it is injected into the polar wellbore again, ensure the safety of the drilling operation, and realize the precision, rapidity and convenience of the drilling fluid temperature control.

[0059] like Figure 2 As shown, this embodiment proposes a third polar drilling mud temperature control system, the system also includes: a safety discharge module; The safety discharge module is respectively connected to the output end of the mud return module and the mud pool in the mud circulation module, and is used to discharge the drilling mud in the mud return module into the mud pool when the pressure of the drilling mud in the mud return module is greater than a preset pressure threshold.

[0060] Specifically, the safety discharge module may be a discharge circuit composed of a relief valve and an electromagnetic reversing valve, and is used to protect internal components of the hydraulic system.

[0061] The polar drilling mud temperature control system proposed in this embodiment can utilize a safety discharge module designed with an overflow valve. When the heater is damaged or the pipeline is blocked, and the hydraulic system pressure is too high, the drilling mud enters the mud pool through the overflow valve and an alarm is issued, thereby avoiding damage to the drilling mud circulation system equipment and enhancing system safety.

[0062] like Figure 3 As shown, this embodiment proposes a first polar drilling mud temperature control method, which is applied to Figure 1 The system shown in the figure has a controller in which a mud return module, a stop valve, a diversion pump and a mud circulation module are communicated and connected. The method may include the following steps: S301. A controller obtains a first mud temperature in a mud return module.

[0063] S302: When the controller determines that the first mud temperature is greater than the maximum allowable temperature, the controller controls the shut-off valve and the diversion pump to be in an open state, so that the drilling mud in the mud return module is transported through the natural cooling pipe and the insulation pipe.

[0064] S303. The controller determines a temperature deviation between a second mud temperature in the mud circulation module and an expected temperature; wherein the expected temperature is greater than a minimum allowable temperature and less than a maximum allowable temperature.

[0065] The expected temperature is the mud temperature expected to be obtained after the drilling mud is heated, cooled or kept warm.

[0066] It can be understood that, in this embodiment, it is desired to control the temperature of the mud in the mud circulation module to be close to the desired temperature.

[0067] Specifically, the expected temperature may be obtained according to the lowest allowable temperature and the highest allowable temperature. For example, the expected temperature may be set to be the average of the lowest allowable temperature and the highest allowable temperature.

[0068] S304. The controller controls the rotation speed of the shunt pump according to the temperature deviation, so that the shunt pump distributes the mud flow in the natural cooling pipe and the insulation pipe, insulates the drilling mud in the insulation pipe, and cools the drilling mud in the natural cooling pipe.

[0069] Optional, such as Figure 2 As shown, the above system also includes: a first reversing valve, a heater and a second reversing valve; The input end of the first reversing valve is connected to the output end of the mud return module, the first output end of the first reversing valve is connected to the first input end of the second reversing valve through the heater, and the second output end of the first reversing valve is connected to the input end of the diverter valve; The second input end of the second reversing valve is connected to the output end of the collecting valve, and the output end of the second reversing valve is connected to the mud input end of the polar wellbore through the mud circulation module.

[0070] Optionally, after the controller acquires the first mud temperature in the mud return module, the method further includes: The controller determines that the first mud temperature is less than the minimum allowable temperature, then controls the shut-off valve and the diverter pump to be in a closed state, controls the first reversing valve and the second reversing valve to be in an energized state, so that the first output end of the first reversing valve is in an open state, the second output end of the first reversing valve is in a closed state, the first input end of the second reversing valve is in an open state, and the second input end of the second reversing valve is in a closed state, and starts the heater, and controls the power of the heater according to the temperature deviation between the second mud temperature in the mud circulation module and the desired temperature, so that all the drilling mud in the mud return module is transported through the heater, and heats the drilling mud flowing through the heater; Among them, the lowest allowable temperature is lower than the desired temperature.

[0071] Optionally, the above-mentioned control stop valve and diversion pump are in an open state so that the drilling mud in the mud return module is transported through the natural cooling pipeline and the insulation pipeline, including: The controller controls the stop valve and the diverter pump to be in an open state, and controls the first reversing valve and the second reversing valve to be in a power-off state, so that the first output end of the first reversing valve is in a closed state, the second output end of the first reversing valve is in an open state, the first input end of the second reversing valve is in a closed state, and the second input end of the second reversing valve is in an open state, so that the drilling mud in the mud return module is transported through the natural cooling pipe and the insulation pipe.

[0072] Optionally, after the controller acquires the first mud temperature in the mud return module, the method further includes: When the controller determines that the first mud temperature is not less than the minimum allowable temperature and not greater than the maximum allowable temperature, the controller controls the stop valve and the diversion pump to be in a closed state, and controls the first reversing valve and the second reversing valve to be in a power-off state, so that the first output end of the first reversing valve is in a closed state, the second output end of the first reversing valve is in an open state, the first input end of the second reversing valve is in a closed state, and the second input end of the second reversing valve is in an open state, so that all the drilling mud in the mud return module is transported through the insulation pipe.

[0073] Specifically, Figure 2 As shown, when the second reversing valve and the first reversing valve are both two-position three-way electromagnetic reversing valves, the second reversing valve and the first reversing valve can be in the power-off state or in the power-on state at the same time.

[0074] Specifically, this embodiment can first determine whether to heat, cool or keep the drilling mud warm based on the first mud temperature detected by the first temperature sensor, and then control the state of related equipment to heat, cool or keep the drilling mud warm.

[0075] Specifically, when it is determined that the first mud temperature is less than the minimum allowable temperature, the embodiment can control the stop valve and the diverter pump to be in a closed state, control the first reversing valve and the second reversing valve to be in an energized state, so that the first output end of the first reversing valve is in an open state, the second output end of the first reversing valve is in a closed state, the first input end of the second reversing valve is in an open state, and the second input end of the second reversing valve is in a closed state (the drilling mud flows from the polar wellbore, the mud return module, the first reversing valve, the heater, the second reversing valve, the mud circulation module to the polar wellbore in sequence), and start the heater, and control the power of the heater according to the temperature deviation between the second mud temperature in the mud circulation module and the desired temperature, so that all the drilling mud in the mud return module is transported through the heater, and the drilling mud flowing through the heater is heated. Among them, the minimum allowable temperature is less than the desired temperature.

[0076] Specifically, in this embodiment, when it is determined that the first mud temperature is greater than the maximum allowable temperature, the stop valve and the diverter pump are controlled to be in an open state, and the first reversing valve and the second reversing valve are controlled to be in a power-off state, so that the first output end of the first reversing valve is in a closed state, the second output end of the first reversing valve is in an open state, the first input end of the second reversing valve is in a closed state, and the second input end of the second reversing valve is in an open state (the drilling mud flow direction at this time is sequentially from the polar wellbore, the mud return module, the first reversing valve, the diverter valve, the diverter pump, the natural cooling cooling pipe, insulation pipe, collecting valve, second reversing valve, mud circulation module to polar wellbore), so that the drilling mud in the mud return module is transported through the natural cooling pipe and the insulation pipe, and at the same time, the rotation speed of the shunt pump can be controlled according to the temperature deviation between the second mud temperature in the mud circulation module and the expected temperature, so that the shunt pump distributes the mud flow in the natural cooling pipe and the insulation pipe, insulates the drilling mud flowing through the insulation pipe, cools the drilling mud flowing through the natural cooling pipe, increases the cooling range, and improves the cooling accuracy.

[0077] Specifically, when it is determined that the first mud temperature is not less than the minimum allowable temperature and not greater than the maximum allowable temperature, this embodiment can control the shut-off valve and the diverter pump to be in a closed state, and control the first reversing valve and the second reversing valve to be in a power-off state, so that the first output end of the first reversing valve is in a closed state, the second output end of the first reversing valve is in an open state, the first input end of the second reversing valve is in a closed state, and the second input end of the second reversing valve is in an open state (the drilling mud flows in the polar wellbore, the mud return module, the first reversing valve, the insulation pipe, the collecting valve, the second reversing valve, the mud circulation module to the polar wellbore in sequence), so that all the drilling mud in the mud return module is transported through the insulation pipe.

[0078] It should be noted that in order to avoid unnecessary activation of the heater, reduce energy consumption, and avoid overheating of the heater and potential safety hazards, the present embodiment can also control the heater to be in an off state when it is determined that the first mud temperature is not lower than the minimum allowable temperature.

[0079] It can be understood that, compared with setting only a fixed temperature for determining whether to heat, cool or keep warm, the present embodiment sets the minimum allowable temperature and the maximum allowable temperature, compares the relationship between the first mud temperature and the minimum allowable temperature, or compares the relationship between the first mud temperature and the maximum allowable temperature, and then determines whether to heat, cool or keep warm, which can avoid frequent opening or closing of the heater and reduce the risk of heater failure.

[0080] It should also be noted that this embodiment can achieve the following beneficial effects: Energy saving and environmental protection: This embodiment is designed to utilize the polar low temperature environment and natural cooling pipes to naturally cool the drilling mud. Compared with the use of refrigeration units for cooling in related technologies, it avoids the emission of refrigeration units to the polar environment and reduces energy consumption, thereby achieving energy saving and environmental protection in polar drilling.

[0081] High temperature control accuracy: The cooling module of this embodiment establishes temperature control rules for high-temperature drilling fluid based on fuzzy control. There is no need to establish an accurate mathematical model of the controlled object. It has strong applicability and can quickly and accurately control the fluid temperature based on fuzzy control and feedback regulation.

[0082] High safety level: This embodiment can also utilize a safety discharge module designed with an overflow valve. When the heater is damaged or the pipeline is blocked, the system pressure is too high. The drilling mud is controlled to enter the mud pool through the overflow valve and an alarm is issued to avoid damage to the drilling fluid circulation system equipment.

[0083] High degree of automation: This embodiment can use an embedded microcontroller and a variable domain fuzzy control method to control the electromagnetic reversing valve, pump and heater, thereby realizing the automation of drilling fluid temperature control.

[0084] The polar drilling mud temperature control method proposed in this embodiment can compare the size relationship between the first mud temperature and the minimum allowable temperature, or compare the size relationship between the first mud temperature and the maximum allowable temperature, and then determine whether to heat, cool or keep warm, effectively realize the temperature control of the drilling mud, improve the accuracy of mud temperature control, and ensure that the drilling mud temperature is within a reasonable range. This embodiment can perform temperature control after the drilling mud is returned to ensure that the drilling mud is kept within a suitable working temperature range when it is injected into the polar wellbore again, ensure the safety of the drilling operation, and realize the precision, rapidity and convenience of drilling fluid temperature control.

[0085] based on Figure 2 The system shown, Figure 4 As shown, this embodiment proposes a second polar drilling mud temperature control method. In this method, this embodiment can first determine the rotation speed of pump 1, that is, the rotation speed of the return pump (the flow rate that needs to be temperature controlled), that is, determine the mud flow rate in the return pump.

[0086] In this embodiment, the first mud temperature can be judged whether the first mud temperature is greater than the expected temperature (the expected temperature here includes the maximum allowable temperature and the minimum allowable temperature) according to the input temperature fed back by the temperature sensor 1. If so, that is, the first mud temperature is greater than the maximum allowable temperature, the electromagnetic reversing valve 1 and the electromagnetic reversing valve 2 can be closed, and the pump 2 can be turned on for diversion to cool the cooling module. In this embodiment, the fluid temperature output by the temperature sensor 2, that is, the second mud temperature, can be detected, and the controller controls the fluid output according to the second mud temperature, that is, adjusts the speed of the control pump 2 to distribute the mud flow in the natural cooling pipe and the insulation pipe.

[0087] Among them, if the judgment result of whether the first mud temperature is greater than the expected temperature is no, that is, the first mud temperature is lower than the minimum allowable temperature, the electromagnetic reversing valve 1 and the electromagnetic reversing valve 2 can be opened, and the electric heating device, that is, the heater, can be turned on to heat the drilling mud. In this embodiment, the fluid temperature output by the temperature sensor 2, that is, the second mud temperature, can be detected, and the controller controls the fluid output according to the second mud temperature and adjusts the power of the electric heating device.

[0088] The polar drilling mud temperature control method proposed in this embodiment can achieve heating, cooling or heat preservation of polar drilling mud, and improve the accuracy of drilling mud temperature control.

[0089] based on Figure 3 , This embodiment proposes a third polar drilling mud temperature control method, in which the controller can be a variable domain fuzzy controller.

[0090] Optionally, the controller controls the rotation speed of the split flow pump according to the temperature deviation, including: The controller determines a temperature deviation change rate corresponding to the temperature deviation; The controller searches for the corresponding target speed in a preset variable domain fuzzy control rule table according to the determined temperature deviation and temperature deviation change rate; The controller generates a speed control signal according to the target speed and sends the signal to the shunt pump to adjust the speed of the shunt pump to the target speed.

[0091] Specifically, the controller can first determine the temperature deviation e and the rate of change of deviation ec=de / dt , according to the temperature deviation e and the rate of change of deviation ec, through the variable domain fuzzy control rule table of the split flow pump speed, the corresponding split flow pump speed is obtained n , the control quantity is the distribution flow of the natural cooling pipeline Q 1, so as to accurately control the temperature of the fluid in the pipeline.

[0092] In this embodiment, the temperature deviation e and the rate of change of deviation ec It is processed as the input in variable universe fuzzy control to generate corresponding output signals, thus completing the domain range transformation of input and output in variable universe fuzzy control.

[0093] It should be noted that the controller is a key component for processing the flow distribution of the cooling module, which determines the speed and accuracy of the temperature adjustment of the system in the cooling mode.

[0094] like Figure 5 The variable domain fuzzy control process schematic diagram shown in FIG. 1 shows that in this embodiment, the feedback signal of the second temperature sensor and the input signal can be used to perform a difference calculation, that is, to calculate the temperature deviation between the second mud temperature and the desired temperature. e and the rate of change of deviation ec In this embodiment, the temperature deviation e and the rate of change of deviation ec The input is sent to the variable domain fuzzy controller, and the speed of the controlled object, the shunt pump, is determined by the proportional amplifier, the motor-pump flow control module and the temperature adjustment module set in the controller. n , and control the speed of the split flow pump to n .

[0095] The polar drilling mud temperature control method proposed in this embodiment can control the rotation speed of the diversion pump through variable universe fuzzy control, thereby improving the accuracy of cooling control of the drilling mud.

[0096] like Figure 6 As shown, this embodiment provides a controller that can be applied to the above system. The controller is communicatively connected to the mud return module, the stop valve, the diversion pump and the mud circulation module.

[0097] The controller may include: An acquisition unit 601 is used to acquire a first mud temperature in a mud return module; The opening unit 602 is used to determine that the first mud temperature is greater than the maximum allowable temperature, and then control the stop valve and the diversion pump to be in an open state, so that the drilling mud in the mud return module is transported through the natural cooling pipe and the insulation pipe; A determination unit 603 is used to determine a temperature deviation between a second mud temperature in the mud circulation module and an expected temperature; wherein the expected temperature is greater than a minimum allowable temperature and less than a maximum allowable temperature; The control unit 604 is used to control the rotation speed of the shunt pump according to the temperature deviation, so that the shunt pump distributes the mud flow in the natural cooling pipe and the insulation pipe, insulates the drilling mud in the insulation pipe, and cools the drilling mud in the natural cooling pipe.

[0098] It should be noted that the processing of the acquisition unit 601, the opening unit 602, the determination unit 603 and the control unit 604 and the beneficial effects thereof can be respectively referred to in Figure 3 Steps S301 to S304 in the above are not described in detail.

[0099] Optionally, the above system further includes: a first reversing valve, a heater and a second reversing valve; The input end of the first reversing valve is connected to the output end of the mud return module, the first output end of the first reversing valve is connected to the first input end of the second reversing valve through the heater, and the second output end of the first reversing valve is connected to the input end of the diverter valve; The second input end of the second reversing valve is connected to the output end of the collecting valve, and the output end of the second reversing valve is connected to the mud input end of the polar wellbore through the mud circulation module; The controller also includes: A heating unit, for determining that the first mud temperature is less than the minimum allowable temperature after obtaining the first mud temperature in the mud return module, then controlling the shut-off valve and the diverter pump to be in a closed state, controlling the first reversing valve and the second reversing valve to be in an energized state, so that the first output end of the first reversing valve is in an open state, the second output end of the first reversing valve is in a closed state, the first input end of the second reversing valve is in an open state, and the second input end of the second reversing valve is in a closed state, and starting the heater, and controlling the power of the heater according to the temperature deviation between the second mud temperature in the mud circulation module and the desired temperature, so that all the drilling mud in the mud return module is transported through the heater, and heating the drilling mud flowing through the heater; Among them, the lowest allowable temperature is lower than the desired temperature.

[0100] Optionally, the opening unit 602 is further used for: The stop valve and the diverter pump are controlled to be in the open state, and the first reversing valve and the second reversing valve are controlled to be in the power-off state, so that the first output end of the first reversing valve is in the closed state, the second output end of the first reversing valve is in the open state, the first input end of the second reversing valve is in the closed state, and the second input end of the second reversing valve is in the open state, so that the drilling mud in the mud return module is transported through the natural cooling pipe and the insulation pipe.

[0101] Optionally, the controller further includes: The insulation unit is used to determine that the first mud temperature is not less than the minimum allowable temperature and not greater than the maximum allowable temperature after obtaining the first mud temperature in the mud return module as mentioned above, and then control the stop valve and the diversion pump to be in a closed state, and control the first reversing valve and the second reversing valve to be in a power-off state, so that the first output end of the first reversing valve is in a closed state, the second output end of the first reversing valve is in an open state, the first input end of the second reversing valve is in a closed state, and the second input end of the second reversing valve is in an open state, so that all the drilling mud in the mud return module is transported through the insulation pipe.

[0102] Optionally, the control unit 604 is further configured to: Determine a temperature deviation change rate corresponding to the temperature deviation; According to the determined temperature deviation and temperature deviation change rate, the corresponding target speed is searched in the preset variable domain fuzzy control rule table; A speed control signal is generated according to the target speed and sent to the split flow pump to adjust the speed of the split flow pump to the target speed.

[0103] The controller proposed in this embodiment can compare the relationship between the first mud temperature and the minimum allowable temperature, or compare the relationship between the first mud temperature and the maximum allowable temperature, and then determine whether to heat, cool or keep warm, thereby effectively controlling the temperature of the drilling mud, improving the accuracy of mud temperature control, and ensuring that the drilling mud temperature is within a reasonable range.

[0104] The controller in this embodiment is presented in the form of a functional unit, where the unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that executes one or more software or fixed programs, and / or other devices that can provide the above functions.

[0105] The embodiment of the present invention also provides a computer device having the above Figure 6 Controller shown.

[0106] See also Figure 7, a schematic diagram of the structure of a computer device provided by an optional embodiment of the present invention, the computer device includes: one or more processors 10, a memory 20, and interfaces for connecting various components, including high-speed interfaces and low-speed interfaces. The various components are connected to each other using different buses for communication, and can be installed on a common motherboard or installed in other ways as needed. The processor can process instructions executed in the computer device, including instructions stored in or on the memory to display graphical information of the GUI on an external input / output device (such as a display device coupled to the interface). In some optional embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Similarly, multiple computer devices can be connected, and each device provides part of the necessary operations (for example, as a server array, a group of blade servers, or a multi-processor system). Figure 7 A processor 10 is taken as an example.

[0107] The processor 10 may be a central processing unit, a network processor or a combination thereof. The processor 10 may further include a hardware chip. The hardware chip may be a dedicated integrated circuit, a programmable logic device or a combination thereof. The programmable logic device may be a complex programmable logic device, a field programmable gate array, a general purpose array logic or any combination thereof.

[0108] The memory 20 stores instructions executable by at least one processor 10, so that at least one processor 10 executes the method shown in the above embodiment.

[0109] The memory 20 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function. The data storage area may store data created according to the use of the computer device, etc. In addition, the memory 20 may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage devices. In some optional embodiments, the memory 20 may optionally include a memory remotely arranged relative to the processor 10, and these remote memories may be connected to the computer device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0110] The memory 20 may include a volatile memory, such as a random access memory. The memory may also include a non-volatile memory, such as a flash memory, a hard disk or a solid state drive. The memory 20 may also include a combination of the above-mentioned types of memory.

[0111] The computer device further comprises a communication interface 30 for the computer device to communicate with other devices or a communication network.

[0112] The embodiment of the present invention also provides a computer-readable storage medium. The method according to the embodiment of the present invention can be implemented in hardware, firmware, or can be implemented as a computer code that can be recorded in a storage medium, or can be implemented as a computer code that is originally stored in a remote storage medium or a non-temporary machine-readable storage medium and will be stored in a local storage medium through a network download, so that the method described herein can be stored in such software processing on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only storage memory, a random access memory, a flash memory, a hard disk or a solid-state hard disk, etc.; further, the storage medium can also include a combination of the above types of memories. It can be understood that a computer, a processor, a microprocessor controller, or programmable hardware includes a storage component that can store or receive software or computer code. When the software or computer code is accessed and executed by a computer, a processor, or hardware, the method shown in the above embodiment is implemented.

[0113] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A polar drilling mud temperature control system, characterized in that: The system comprises: a mud return module, a diverter valve, a stop valve, a diverter pump, a natural cooling pipeline, a heat preservation pipeline, a collecting valve, a mud circulation module and a controller; The input end of the diverter valve is connected to the mud output end of the polar wellbore through the mud return module, the first output end of the diverter valve is connected to the first input end of the collecting valve through the stop valve, the diverter pump, and the natural cooling pipeline in sequence, and the second output end of the diverter valve is connected to the second input end of the collecting valve through the insulation pipeline; The output end of the collecting valve is connected to the mud input end of the polar wellbore through the mud circulation module; The controller is communicatively connected to the mud return module, the shut-off valve, the shunt pump and the mud circulation module, and is used to determine that the first mud temperature in the mud return module is greater than the maximum allowable temperature, and then control the rotation speed of the shunt pump to distribute the mud flow in the natural cooling pipe and the insulation pipe to cool the drilling mud.

2. The system according to claim 1, characterized in that The mud return module includes: a mud cleaning module, a return pump and a first temperature sensor; The input end of the diverter valve is connected to the mud output end of the polar wellbore through the reflux pump and the mud cleaning module in sequence; The first temperature sensor is disposed on a pipeline between the input end of the diverter valve and the reflux pump. The first temperature sensor is communicatively connected to the controller and is used to detect the first mud temperature and transmit the temperature to the controller.

3. The system according to claim 1, characterized in that The mud circulation module includes: a second temperature sensor, a mud pool and a mud transport module; The output end of the collecting valve is connected to the mud input end of the polar wellbore through the mud pool and the mud delivery module in sequence; The second temperature sensor is disposed on a pipeline between the output end of the collecting valve and the mud pool, and is communicatively connected to the controller, and is used to detect the second mud temperature in the mud circulation module and transmit it to the controller; The controller is also used to control the rotation speed of the diverter pump according to the temperature deviation between the second mud temperature and the expected temperature, so as to transport the drilling mud from the diverter valve to the natural cooling pipe and the insulation pipe, and distribute the mud flow in the natural cooling pipe and the insulation pipe to cool the drilling mud.

4. The system according to any one of claims 1 to 3, characterized in that The system also includes: a first reversing valve, a heater, and a second reversing valve; The input end of the first reversing valve is connected to the output end of the mud return module, the first output end of the first reversing valve is connected to the first input end of the second reversing valve through the heater, and the second output end of the first reversing valve is connected to the input end of the diverter valve; The second input end of the second reversing valve is connected to the output end of the collecting valve, and the output end of the second reversing valve is connected to the mud input end of the polar wellbore through the mud circulation module; The heater is communicatively connected to the controller; The controller is also used to determine that the first mud temperature is lower than the lowest allowable temperature, then all the drilling mud in the mud return module is transported through the heater, and the heater is controlled to heat the drilling mud flowing through.

5. A method for controlling temperature of polar drilling mud, characterized in that: Applicable to the system of claim 1, wherein the controller in the system is communicatively connected to the mud return module, the shut-off valve, the diversion pump and the mud circulation module; The method comprises: The controller obtains a first mud temperature in the mud return module; The controller determines that the first mud temperature is greater than the maximum allowable temperature, and then controls the shut-off valve and the diversion pump to be in an open state, so that the drilling mud in the mud return module is transported through the natural cooling pipe and the insulation pipe; The controller determines a temperature deviation between a second mud temperature in the mud circulation module and a desired temperature; wherein the desired temperature is greater than a minimum allowable temperature and less than the maximum allowable temperature; The controller controls the rotation speed of the shunt pump according to the temperature deviation, so that the shunt pump distributes the mud flow in the natural cooling pipe and the insulation pipe, insulates the drilling mud in the insulation pipe, and cools the drilling mud in the natural cooling pipe.

6. The method according to claim 5, characterized in that The system also includes: a first reversing valve, a heater, and a second reversing valve; The input end of the first reversing valve is connected to the output end of the mud return module, the first output end of the first reversing valve is connected to the first input end of the second reversing valve through the heater, and the second output end of the first reversing valve is connected to the input end of the diverter valve; The second input end of the second reversing valve is connected to the output end of the collecting valve, and the output end of the second reversing valve is connected to the mud input end of the polar wellbore through the mud circulation module; After the controller acquires the first mud temperature in the mud return module, the method further includes: The controller determines that the first mud temperature is less than the minimum allowable temperature, then controls the stop valve and the diverter pump to be in a closed state, controls the first reversing valve and the second reversing valve to be in an energized state, so that the first output end of the first reversing valve is in an open state, the second output end of the first reversing valve is in a closed state, the first input end of the second reversing valve is in an open state, and the second input end of the second reversing valve is in a closed state, and starts the heater, and controls the power of the heater according to the temperature deviation between the second mud temperature in the mud circulation module and the expected temperature, so that all the drilling mud in the mud return module is transported through the heater, and the drilling mud flowing through the heater is heated; Wherein, the minimum allowable temperature is lower than the expected temperature.

7. The method according to claim 6, characterized in that The step of controlling the shut-off valve and the diversion pump to be in an open state so that the drilling mud in the mud return module is transported through the natural cooling pipe and the insulation pipe includes: The controller controls the stop valve and the diverter pump to be in an open state, and controls the first reversing valve and the second reversing valve to be in a power-off state, so that the first output end of the first reversing valve is in a closed state, the second output end of the first reversing valve is in an open state, the first input end of the second reversing valve is in a closed state, and the second input end of the second reversing valve is in an open state, so that the drilling mud in the mud return module is transported through the natural cooling pipe and the insulation pipe.

8. The method according to claim 6, characterized in that After the controller acquires the first mud temperature in the mud return module, the method further includes: When the controller determines that the first mud temperature is not less than the minimum allowable temperature and not greater than the maximum allowable temperature, the stop valve and the diversion pump are controlled to be in a closed state, and the first reversing valve and the second reversing valve are controlled to be in a power-off state, so that the first output end of the first reversing valve is in a closed state, the second output end of the first reversing valve is in an open state, the first input end of the second reversing valve is in a closed state, and the second input end of the second reversing valve is in an open state, so that all the drilling mud in the mud return module is transported through the insulated pipe.

9. The method according to any one of claims 5 to 8, characterized in that The controller controls the rotation speed of the shunt pump according to the temperature deviation, including: The controller determines a temperature deviation change rate corresponding to the temperature deviation; The controller searches for the corresponding target speed in a preset variable domain fuzzy control rule table according to the determined temperature deviation and temperature deviation change rate; The controller generates a speed control signal according to the target speed and sends the signal to the shunt pump to adjust the speed of the shunt pump to the target speed.

10. A controller, characterized in that: Applied to the system of claim 1, the controller is communicatively connected to the mud return module, the shut-off valve, the diverter pump and the mud circulation module; The controller comprises: An acquisition unit, used for acquiring a first mud temperature in the mud return module; an opening unit, for determining that the first mud temperature is greater than the maximum allowable temperature, and then controlling the shut-off valve and the diversion pump to be in an open state, so that the drilling mud in the mud return module is transported through the natural cooling pipe and the insulation pipe; A determination unit, configured to determine a temperature deviation between a second mud temperature in the mud circulation module and an expected temperature; wherein the expected temperature is greater than a minimum allowable temperature and less than a maximum allowable temperature; A control unit is used to control the rotation speed of the shunt pump according to the temperature deviation, so that the shunt pump distributes the mud flow in the natural cooling pipe and the insulation pipe, insulates the drilling mud in the insulation pipe, and cools the drilling mud in the natural cooling pipe.

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