Control system for drilling fluid cooling and industrial processing system

Abstract

The application discloses a control system for drilling fluid cooling, which comprises a heat exchange tank, a mud circulating loop, a cooling water circulating loop and a control device. The heat exchange tank is divided into a mud flowing space and a cooling water flowing space by a partition plate. The heat pipe is used to transfer the heat of the mud in the mud flowing space to the cooling water in the cooling water flowing space, so as to cool the mud. The mud circulating loop is used to deliver the mud to be cooled to the mud flowing space and deliver the cooled mud back to the wellbore after the cooling treatment is completed by the heat pipe. The cooling water circulating loop is used to form a cooling water circulating flow channel with the cooling water flowing space and cool the cooling water in the current channel after being started. The control device is used to automatically control the mud cooling treatment and the cooling water cooling treatment by using a preset cooling control rule. The application can continuously cool the high-temperature mud and greatly reduce the mud temperature entering the well.

Description

Technical Field

[0001] This invention relates to the field of oil and gas well drilling technology, and in particular to a control system and industrial processing system for cooling drilling fluid. Background Technology

[0002] With the rapid development of drilling and completion technologies, ultra-deep wells and ultra-high temperatures have become one of the bottlenecks restricting oil resource extraction. In the Southwest Block, when the well depth exceeds 7000m, the bottom hole temperature can reach 200℃; in the Shunbei Block, the well depth has exceeded 9000m, and the bottom hole temperature is nearly 180℃. High downhole temperatures severely restrict the reliability and stability of downhole directional instruments such as MWD and screws, while also increasing the number of tripping operations and even making directional operations impossible.

[0003] In existing drilling operations, the usual method for cooling mud is to extend the mud tank path during construction, allowing the mud to cool naturally during circulation. However, this method is greatly affected by site conditions and the environment, and the cooling effect is poor.

[0004] Therefore, the existing technology needs to provide a control system that can actively cool the drilling fluid, thereby effectively solving one or more of the above-mentioned technical problems. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a control system for drilling fluid cooling, comprising: a heat exchange tank, which divides its internal space into a mud flow space and a cooling water flow space via a partition, for using heat pipes that simultaneously penetrate both spaces to transfer heat from the mud in the mud flow space to the cooling water in the cooling water flow space, thereby cooling the mud; a mud circulation loop, for transporting the mud to be cooled to the mud flow space, and after the cooling process is completed by the heat pipes, introducing cooled mud to return the cooled mud to the wellbore; a cooling water circulation loop, which, upon startup, forms a cooling water circulation channel with the cooling water flow space and cools the cooling water in the current flow channel; and a control device, for automatically controlling the mud cooling process and the cooling water cooling process using preset cooling control rules.

[0006] Preferably, the mud circulation loop includes: a first mud tank, which is connected to the well site drilling fluid circulation system and the inlet of the mud flow space, respectively, for storing the mud to be cooled, and pumping the mud to be cooled into the mud flow space using an internal pumping pump; and a second mud tank, which is connected to the outlet of the mud flow space via a discharge pump, for introducing the cooled mud under the control of the discharge pump and transporting it back to the wellbore.

[0007] Preferably, the control device is further configured to detect the liquid level state in the second mud pool in real time, and based on this, adjust the operating frequency of the mud discharge pump to maintain the stability of the liquid level state in the second mud pool.

[0008] Preferably, the control device is further configured to detect the liquid level state in the mud flow space in real time, and based on this, adjust the operating frequency of the mud suction pump in the mud circulation loop to maintain the stability of the liquid level state in the mud flow space.

[0009] Preferably, the heat exchange tank further comprises a mud self-circulation device in communication with the mud flow space, configured to extract mud in the mud flow space under the control of a self-circulation start instruction, to circulate the mud in a self-circulation manner, and return the circulated mud to the mud flow space, wherein an array of temperature sensors is arranged on the inner wall of the mud flow space, and the control device is further configured to monitor the real-time internal temperature of the mud flow space through the array of temperature sensors, and generate the self-circulation start instruction when the internal temperature exceeds a preset self-circulation start temperature threshold.

[0010] Preferably, the control device is further configured to detect the inlet temperature and outlet temperature of the mud flow space in real time, and based on this, adjust the operating frequency of the self-circulation pump in the mud self-circulation device to control the pump displacement of the self-circulation process.

[0011] Preferably, the cooling water circulation loop comprises a cooling water circulation pump connected with the outlet of the cooling water flow space and the inlet of the heat dissipation device respectively, configured to be started under the control of a cooling water circulation start instruction, and to deliver the cooling water in the cooling water flow space to the heat dissipation device; a heat dissipation device configured to be started under the control of the cooling water circulation start instruction, and to use evaporative cooling technology to cool the delivered cooling water; and a cooling water valve connected with the outlet of the heat dissipation device and the inlet of the cooling water flow space through a cooling water circulation pipeline, configured to be started under the control of a cooling water valve start instruction to deliver the cooling water in the heat dissipation device back to the cooling water flow space, wherein the cooling water valve start instruction is formed after the cooling water circulation start instruction.

[0012] Preferably, the control device is further configured to detect the liquid level state in the heat dissipation device in real time, and generate the cooling water valve start instruction when the current liquid level of the heat dissipation device reaches or exceeds a preset upper limit threshold of the liquid level of the heat dissipation device, and to detect the liquid level state in the cooling water flow space in real time, and adjust the operating frequency of the cooling water circulation pump according to the liquid level of the cooling water flow space to adjust the cooling water displacement.

[0013] Preferably, the control device is further configured to control the cooling water circulating pump to operate at a low frequency, and generate a cooling water valve closing instruction after a preset time period, wherein the liquid level in the cooling water flow space is detected in real time, and the operating frequency of the cooling water circulating pump is adjusted according to the liquid level in the cooling water flow space to maintain the stability of the liquid level in the cooling water flow space.

[0014] Preferably, the flow direction of the mud in the mud circulating loop is opposite to the flow direction of the cooling water in the cooling water circulating loop.

[0015] Preferably, the control system comprises a water replenishing valve in communication with the cooling water flow space and configured to be opened to introduce cooling water into the cooling water flow space under the control of a water replenishing instruction, wherein the control device is further configured to detect the liquid level in the mud flow space in real time, and generate the water replenishing instruction for opening, closing and opening degree control of the water replenishing valve based on the liquid level in the mud flow space.

[0016] In another aspect, an industrial processing system is provided, which comprises the drilling fluid cooling control system as described above, and a client in communication with the control device in the control system and configured to edit the preset cooling control rule and set the threshold values involved in the preset cooling control rule.

[0017] Preferably, the control device is further configured to record and store well site production data.

[0018] Compared with the prior art, one or more embodiments in the above scheme can have the following advantages or beneficial effects:

[0019] The present application provides a drilling fluid cooling control system and an industrial processing system. The present application is applied to deep wells and high-temperature wells, and heat in high-temperature mud is quickly and efficiently transferred to cooling water through heat pipes in a heat exchange tank, and the high-temperature mud cooling system is automatically controlled with the drilling fluid circulation at a well site, so that the cooling effect of the high-temperature mud is automatically and maximally achieved. At the same time, the synchronous operation control of the high-temperature mud cooling circulating loop and the cooling water circulating loop achieves the continuous cooling effect of the high-temperature mud, and greatly reduces the temperature of the mud into the well. Liquid level sensors are respectively arranged at positions such as the mud pool before and after cooling, the mud side, the heat dissipation device, and the cooling water side, and temperature sensors are respectively arranged at positions such as the mud pool before and after cooling and the cooling water inlet and outlet, so that the automatic control of the mud side circulation and the cooling water side circulation is achieved, the cooling effect is maximized, and the safety work requirements of downhole measuring tools under deep well and high-temperature well conditions are met.

[0020] Additional features and advantages of the present application will be set forth in the description that follows, and in part will be apparent from the description, or can be learned by practice of the application. The objectives and other advantages of the present application will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings are included to provide a further understanding of the present application and are incorporated in and constitute a part of this specification, illustrate embodiments of the present application and together with the description serve to explain the present application. In the drawings:

[0022] Figure 1 It is a whole structure schematic view of the control system for drilling fluid cooling of the embodiment of the present application.

[0023] Figure 2 It is a specific structure schematic view of the control system for drilling fluid cooling of the embodiment of the present application.

[0024] Figure 3 It is a structure schematic view of the heat exchange tank in the control system for drilling fluid cooling of the embodiment of the present application.

[0025] Figure 4 It is a structure schematic view of the industrial processing system of the embodiment of the present application. DETAILED DESCRIPTION

[0026] The embodiments of the present application will be described in detail with reference to the drawings and embodiments below, by which the process of how the present application applies technical means to solve technical problems and achieves technical effects can be fully understood and implemented. It should be noted that, as long as there is no conflict, each embodiment in the present application and each feature in each embodiment can be combined with each other, and the technical solutions formed thereby are within the protection scope of the present application.

[0027] In addition, the steps shown in the flowchart of the drawings can be executed in a computer system such as a group of computer executable instructions. Moreover, although the logical order is shown in the flowchart, in some cases, the steps shown or described herein can be executed in an order different from that shown.

[0028] With the rapid development of drilling and completion technology, ultra-deep wells and ultra-high temperature have become one of the bottlenecks restricting the exploitation of oil resources. In the southwest block, when the well depth exceeds 7000m, the bottom hole temperature can reach 200℃; in the shunbei block, the well depth has broken through 9000m, and the bottom hole temperature is nearly 180℃. The downhole high temperature seriously restricts the reliability and stability of downhole directional instruments such as MWD and screw rod, increases the tripping frequency, and even cannot carry out directional operation.

[0029] In the existing drilling operation, the means for cooling mud is usually to extend the mud tank path during construction, so that the mud is naturally cooled in the circulation. This method is greatly affected by site conditions and environment, and has poor cooling effect.

[0030] Therefore, in order to solve one or more of the above technical problems, the embodiments of the present application propose a control system for drilling fluid cooling. The system is used in conjunction with the well site drilling fluid circulation system by using the heat pipe in the heat exchange tank, and quickly and efficiently transfers the heat in the high-temperature mud to the cooling water, thereby achieving the cooling effect of high-temperature mud. Specifically, by the synchronous operation of the high-temperature mud cooling system and the cooling water circulation system, the continuous cooling effect of the high-temperature mud is achieved, and the temperature of the mud into the well is greatly reduced. Wherein, by designing temperature and liquid level sensors at different positions in the high-temperature mud cooling system and the cooling water circulation system, and combining with the preset cooling control rule, the automatic control of the mud side circulation and the cooling water side circulation is realized. In this way, the present application can maximize the cooling effect of the mud and meet the demand for safe operation of downhole measuring tools under deep well and high temperature well conditions.

[0031] Figure 1 The overall structure diagram of the control system for drilling fluid cooling of the embodiments of the present application is shown in the figure. Figure 1 The drilling fluid cooling control system of the embodiments of the present application at least includes a heat exchange tank A (or 1), a mud circulation loop B, a cooling water circulation loop C and a control device D.

[0032] (Reference Figure 3 ) The heat exchange tank A divides the internal space into a mud flow space A1 and a cooling water flow space A2 by a partition plate 11. The heat exchange tank A has a plurality of heat pipes 12 inside, each heat pipe is distributed at intervals along the partition plate 11, and each heat pipe 12 simultaneously penetrates the mud flow space A1 and the cooling water flow space A2. Specifically, the heat exchange tank A is used to transfer the heat of the (high-temperature) mud in the mud flow space A1 to the cooling water in the cooling water flow space A2 by using the heat pipe 12 which simultaneously penetrates the mud flow space and the cooling water flow space, so as to cool the (high-temperature) mud.

[0033] The mud circulation loop B is connected with the well site drilling fluid circulation system and the mud flow space A1 respectively. The mud circulation loop B is used to transport the mud to be cooled (drilling fluid to be cooled) extracted from the well site drilling fluid circulation system to the mud flow space A1, and after the cooling and cooling treatment by the heat pipe, the cooled mud is introduced, so as to transport the cooled mud back to the wellbore. In the embodiments of the present application, the mud to be cooled (drilling fluid to be cooled) is the high-temperature mud (the drilling fluid in high-temperature state) which needs to be cooled at present.

[0034] The cooling water circulation loop C is communicated with the cooling water flow space A2. The cooling water circulation loop C is used to form a cooling water circulation flow channel with the cooling water flow space A2 after starting, and to cool the cooling water in the current cooling water circulation flow channel by using the evaporative cooling technology.

[0035] The control device D is electrically connected with the mud circulation loop B, and the control device D is electrically connected with the cooling water circulation loop C. The control device D is used to automatically control the mud cooling treatment and the cooling water cooling treatment by using the preset cooling control rule.

[0036] Further, in the embodiment of the present application, in order to improve the heat exchange efficiency of the heat exchange tank A, the high-temperature mud flow direction in the mud circulation loop B and the cooling water flow direction in the cooling water circulation loop C are opposite.

[0037] Therefore, the drilling fluid cooling control system can be applied to deep wells and high-temperature wells. By using the heat pipe in the heat exchange tank, the heat in the high-temperature mud to be cooled is quickly and efficiently transferred from the mud flow space A1 to the cooling water flow space A2, so as to realize the cooling effect of the high-temperature mud. In addition, the cooling water in the space A2 absorbs the heat transferred by the heat pipe, so that the temperature of the cooling water is increased. At the same time, the evaporative cooling technology is used to continuously cool the cooling water after absorbing heat and increasing temperature. In this way, the control device is used to control the synchronous operation of the high-temperature mud cooling circulation treatment equipment (related to the mud cooling treatment) and the cooling water circulation system (related to the cooling water cooling treatment), so as to further achieve the continuous cooling effect of the high-temperature mud and greatly reduce the temperature of the mud into the well.

[0038] Figure 3 The structure diagram of the heat exchange tank in the control system for cooling the drilling fluid in the embodiment of the present application. As shown in Figure 3As shown, the heat exchange tank 1 comprises a partition plate 11 and a plurality of heat pipes 12. The partition plate 11 divides the internal space of the heat exchange tank 1 into a heat exchange tank mud side 101 (i.e. a mud flow space A1) and a heat exchange tank cold water side 102 (i.e. a cooling water flow space A2). The heat pipes 12 are fixed on the partition plate 11, wherein the evaporation section of each heat pipe 12 is placed in the heat exchange tank mud side 101, and the condensation section of each heat pipe 12 is placed in the heat exchange tank cold water side 102. The heat exchange tank 1 is an open structure, and the top is a movable steel plate, which can be easily assembled and disassembled. The partition plate 11 is a steel plate, and the partition plate 11 is perpendicular to the bottom surface and the inner wall surface of the heat exchange tank 1. The heat pipes 12 are uniformly arranged on the partition plate 11, and the two ends of the heat pipes 12 are respectively immersed in the mud in the mud flow space A1 and the cooling water in the cooling water flow space A2. It should be noted that the number and arrangement of the heat pipes in the heat exchange tank 1 in the embodiment of the present application are not specifically limited, and those skilled in the art can set them according to the cooling amount of the mud.

[0039] Figure 2 The specific structure of the control system for the drilling fluid cooling in the embodiment of the present application is shown. The specific structure and function of the drilling fluid cooling control system in the embodiment of the present application will be described below. Figure 2 and Figure 3 The specific structure and function of the drilling fluid cooling control system in the embodiment of the present application will be described below.

[0040] As shown in Figure 2 , the mud circulation loop B comprises a first mud tank 7, a first mud tank liquid level meter 71, a mud suction pump 72, a mud discharge pump 2, a second mud tank 8, and a second mud tank liquid level meter 81. The first mud tank 7 is connected in communication with the well site drilling fluid circulation system and the inlet of the mud flow space A1 (or 101) through mud conveying pipelines. The first mud tank 7 is a hot mud tank, and the first mud tank liquid level meter 71 is arranged inside the first mud tank 7. In addition, the mud suction pump 72 is arranged inside the first mud tank 7 and close to the outlet of the first mud tank 7. The control device D is electrically connected with the mud suction pump 72 and the first mud tank liquid level meter 71. Further, the mud suction pump control unit D1 in the control device D is electrically connected with the mud suction pump 72 and the first mud tank liquid level meter 71. The first mud tank 7 is used to store the above-mentioned mud to be cooled, and the internal mud suction pump 72 is used to pump the mud to be cooled into the mud flow space A1.

[0041] The slurry pump 2 is connected to the outlet of the mud flow space A1 through a mud conveying pipeline, and the slurry pump 2 is also connected to the second mud tank 8 through a mud conveying pipeline, so that the mud flow space A1 is connected to the outlet of the second mud tank 8 through the slurry pump 2. The second mud tank 8 is a cold mud tank, and a second mud tank liquid level meter 81 is arranged in the second mud tank 8. The control device D is also electrically connected to the slurry pump 2 and the second mud tank liquid level meter 81, respectively. Further, the slurry pump control unit D2 in the control device D is electrically connected to the slurry pump 2 and the second mud tank liquid level meter 81, respectively.

[0042] In addition, the second mud tank 8 is also connected to the well site drilling fluid circulation system. Further, the second mud tank 8 is used to discharge the cooled mud from the outlet of the mud flow space A1 into the second mud tank 8 under the control of the slurry pump 2, and to deliver the cooled mud back to the wellbore by using the second mud tank 8.

[0043] Reference Figure 2 Since the drilling fluid cooling control system mainly includes two loops of a cold water side (A2) automatic control cycle and a mud side (A1) automatic control cycle. The mud side automatic control cycle mainly ensures that the liquid level state in the cold mud tank 8 and the mud flow space A1 remains unchanged.

[0044] Further, the control device D in the embodiment of the present application is also used to detect the liquid level state in the second mud tank 8 in real time, and adjust the operation frequency of the slurry pump 2 according to the real-time second mud tank liquid level data, so as to keep the liquid level state in the second mud tank 8 stable. Specifically, the slurry pump control unit D2 in the control device D is used to receive and detect the second mud tank liquid level data collected by the second mud tank liquid level meter 81 in real time, and adjust the operation frequency of the slurry pump 2 according to the dynamic change state of the second mud tank liquid level data, so as to timely supplement the cooled mud in the heat exchange tank mud side 101 to the cold mud tank 8. Wherein, when the slurry pump control unit D2 in the control device D detects that the real-time second mud tank liquid level data is less than a preset second mud tank normal liquid level threshold, the slurry pump 2 is controlled to start or adjust the operation frequency of the slurry pump 2 (increase adjustment), or when the slurry pump control unit D2 in the control device D detects that the real-time second mud tank liquid level data reaches or exceeds the second mud tank normal liquid level threshold, the slurry pump 2 is controlled to stop or adjust the operation frequency of the slurry pump 2 (decrease adjustment), so as to automatically control the stability of the liquid level of the cold mud tank 8 by using the control device D.

[0045] Further, the control device D in the embodiment of the present application is also used for detecting the liquid level state in the mud flow space A1 in real time, and adjusting the operation frequency of the mud pumping pump 82 according to the real-time mud flow space liquid level data, so as to keep the liquid level state in the mud flow space A1 stable. Wherein, the mud flow space A1 is provided with a mud flow space liquid level gauge 1011. The mud flow space liquid level gauge 1011 is electrically connected with the control device D (the mud pumping pump control unit D1 in the control device D).

[0046] Specifically, the mud pumping pump control unit D1 in the control device D is used for receiving and detecting the mud flow space liquid level data collected by the mud flow space liquid level gauge 1011 in real time, and adjusting the operation frequency of the mud pumping pump 82 according to the dynamic change state of the mud flow space liquid level data, so as to timely supplement the high-temperature mud in the hot mud pool 7 to the heat exchange tank mud side 101. Wherein, when the mud pumping pump control unit D1 in the control device D detects that the real-time mud flow space liquid level data is less than the preset mud flow space normal liquid level threshold, the control device D controls the mud pumping pump 82 to start or adjust the operation frequency (increase adjustment) of the mud pumping pump 82, or when the mud pumping pump control unit D1 in the control device D detects that the real-time mud flow space liquid level data reaches or exceeds the mud flow space normal liquid level threshold, the control device D controls the mud pumping pump 82 to stop or adjust the operation frequency (decrease adjustment) of the mud pumping pump 82, so as to automatically control the stability of the liquid level of the heat exchange tank mud side 101 by the control device D.

[0047] Further, in order to improve the heat exchange efficiency of the heat exchange tank mud side 101, the embodiment of the present application further provides a temperature sensor array T5 on the inner wall of the mud flow space A1. Wherein, the temperature sensor array T5 is a distributed temperature sensor. The temperature sensor array T5 is electrically connected with the control device D (the self-circulation control unit D3 in the control device D). In addition, in order to reduce the uneven degree of each position of the mud cooling side 101, a self-circulation system is designed. Further, the above-mentioned heat exchange tank A further comprises a mud self-circulation device A3.

[0048] Further, the mud self-circulation device A3 is connected with the mud flow space A1. The mud self-circulation device A3 is used for starting and pumping the mud in the mud flow space A1 under the control of the self-circulation starting instruction, and performing cooling circulation treatment on the pumped mud in a self-circulation manner, so as to return the cooled and circulated mud to the mud flow space A1. Wherein, the control device D is also used for monitoring the real-time internal temperature of the mud flow space A1 by the temperature sensor array T5, and generating the self-circulation starting instruction when the internal temperature exceeds the preset self-circulation starting temperature threshold.

[0049] Specifically, the mud self-circulation device A3 comprises a self-circulation pump 133 and a self-circulation pipeline 132. Both ends of the self-circulation pipeline 132 are connected to the side wall of the heat exchange tank mud side 101 through the orifice plate 131. The self-circulation pump 133 is arranged on the pipeline of the self-circulation pipeline 132. Moreover, the self-circulation pump 133 is electrically connected with the control device D (the self-circulation control unit D3 therein). The mud self-circulation device A3 uses the self-circulation pump 133 therein to suck mud from different positions of the side wall of the mud flow space A1, and then sprays the sucked mud to the upper side of the heat exchange tank mud side 101.

[0050] In addition, the control device D in the embodiment of the present application is also used for detecting the inlet temperature and the outlet temperature of the mud flow space A1 in real time, adjusting the operating frequency of the self-circulation pump 133 in the mud self-circulation device A3 according to the current inlet temperature and outlet temperature data, so as to control the pump displacement of the self-circulation treatment. In the embodiment of the present application, the mud inlet temperature sensor T1 is arranged in the mud conveying pipeline near the inlet of the mud flow space A1, and the mud outlet temperature sensor T2 is arranged in the mud conveying pipeline near the outlet of the mud flow space A1. Both the mud inlet temperature sensor T1 and the mud outlet temperature sensor T2 are electrically connected with the control device D (the self-circulation control unit D3 therein).

[0051] Specifically, the self-circulation control unit D3 in the control device D is used for receiving and detecting the real-time mud inlet temperature data and the real-time mud outlet temperature data collected by the mud inlet temperature sensor T1 and the mud outlet temperature sensor T2 in real time, and adjusting the operating frequency of the self-circulation pump 133 according to the dynamic change state of the real-time mud inlet temperature data and the real-time mud outlet temperature data, so as to control the pump displacement of the self-circulation treatment. Thus, the present application controls the size of the pump displacement of the self-circulation pump by monitoring the data of the temperature sensors T1 and T2 before and after the mud cooling side, so as to realize the maximum reduction of the temperature of the mud drilling fluid.

[0052] Further, as the drilling work continues, the mud in the cold mud tank 8 is continuously reduced, the liquid level sensor 81 sends a signal to the mud discharging pump 2 to adjust the frequency, so as to timely supplement the cooled mud in the heat exchange tank mud side 101 to the cold mud tank 8, and keep the liquid level stable; after the mud in the heat exchange tank mud side 101 is reduced, the liquid level sensor 1011 sends a signal to the mud pumping pump 72 to adjust the frequency, so as to timely supplement the hot mud from the hot mud tank 7 to the heat exchange tank mud side 101, and keep the liquid level stable; in order to improve the mud heat exchange efficiency, the higher temperature mud is sucked out by the self-circulation pump 133 and then returned to the mud side 101 for cooling through the distributed temperature sensor T5 of the heat exchange tank mud side.

[0053] Thus, the embodiment of the present application controls the mud pump to pass the high-temperature mud from one side into the mud side of the cooling tank heat exchange tank through the mud circulating pipeline 3 according to the liquid level in the mud side of the cooling tank heat exchange tank, and controls the displacement and start-stop of the self-circulating device according to the temperature sensor array arranged in the mud side of the heat exchange tank, so that the mud is fully contacted with the heat pipe, and after the heat pipe in the cooling tank absorbs heat, the mud is cooled to the target temperature, and the discharge pump is controlled according to the liquid level of the cooling mud pool to discharge the cooled mud to the cooling mud pool, and finally the cooled mud is transported back to the wellbore through the mud pump, the mud circulating pipeline 3 and other components.

[0054] With reference to Figure 2 , the cooling water circulating loop C includes a cooling water circulating pump 4, a heat dissipation device 6, a heat dissipation device liquid level meter 61 and a cooling water valve 9. The cooling water circulating pump 4 is connected to the outlet of the cooling water flow space A2 (or 102) through a cooling water circulating pipeline. The inlet of the heat dissipation device 6 is connected to the cooling water circulating pump 4 through a cooling water circulating pipeline. The heat dissipation device 6 is a cooling tower, and the heat dissipation device liquid level meter 61 is arranged in the cooling tower tray. In addition, the outlet of the heat dissipation device 6 is connected to the cooling water valve 9 through a cooling water circulating pipeline, and the cooling water valve 9 is connected to the inlet of the cooling water flow space A2 through a cooling water circulating pipeline. The control device D is electrically connected to the cooling water circulating pump 4, the heat dissipation device liquid level meter 61 and the cooling water valve 9, respectively. Further, the cooling water control unit D4 in the control device D is electrically connected to the cooling water circulating pump 4, the heat dissipation device liquid level meter 61 and the cooling water valve 9, respectively.

[0055] The cooling water circulating pump 4 is used to be started under the control of the cooling water circulating start instruction, and to transport the cooling water in the cooling water flow space to the heat dissipation device 6. The heat dissipation device 6 is used to be started under the control of the cooling water circulating start instruction, and to cool the cooling water input by using the evaporative cooling technology. The cooling water valve 9 is used to be started under the control of the cooling water valve start instruction, to transport the cooling water in the heat dissipation device 6 back to the cooling water flow space A2. Wherein, the cooling water valve start instruction is formed after the cooling water circulating start instruction. In addition, the outlet of the cooling water flow space A2 and the inlet of the mud flow space are located on the first side wall of the heat exchange tank A, and the inlet of the cooling water flow space A2 and the outlet of the mud flow space are located on the second side wall of the heat exchange tank A, wherein the first side wall and the second side wall are oppositely arranged.

[0056] Further, with reference to Figure 2The drilling fluid cooling control system further comprises a water supplement valve 1022. The water supplement valve 1022 is connected with the cooling water flow space A2. The control device D (the cooling water control unit D4 in the control device D) is electrically connected with the water supplement valve 1022. The water supplement valve 1022 is used for opening under the control of a water supplement instruction, and the cooling water is introduced into the cooling water flow space A2. The control device D is further used for detecting the liquid level state of the mud flow space in real time, and based on this, a water supplement instruction for opening and closing and opening degree control of the water supplement valve 1022 is generated.

[0057] Further, the cooling water flow space A2 is provided with a cooling water flow space liquid level meter 1021. The cooling water flow space liquid level meter 1021 is electrically connected with the control device D (the cooling water control unit D4 in the control device D). Specifically, the cooling water control unit D4 in the control device D is used for receiving and detecting the cooling water flow space liquid level data collected by the cooling water flow space liquid level meter 1021 in real time, and adjusting the opening and closing and opening degree state of the water supplement valve 1022 according to the dynamic change state of the cooling water flow space liquid level data, so as to supplement the cooling water to the cooling water flow space in time. When the cooling water control unit D4 in the control device D detects that the real-time cooling water flow space liquid level data is less than a preset cooling water flow space normal liquid level threshold value, the water supplement valve 1022 is controlled to open and adjust the opening degree (increase adjustment) of the water supplement valve 1022, or when the cooling water control unit D4 in the control device D detects that the real-time cooling water flow space liquid level data reaches or exceeds the cooling water flow space normal liquid level threshold value, the water supplement valve 1022 is controlled to close or adjust the opening degree (decrease adjustment) of the water supplement valve 1022, so as to automatically control the stability of the liquid level of the cooling water flow space A2 by the control device D.

[0058] Specifically, the liquid level sensor 1021 is arranged in the cooling water side 102, and the opening and closing and opening degree of the water supplement valve 1022 are controlled according to the real-time data collected by the sensor 1021. When the current liquid level is lower than the set value, the water supplement valve 1022 is opened and the corresponding opening degree is set, and when the liquid level is higher than the set value, the water supplement valve is closed or the opening degree is adjusted.

[0059] In actual application, when all the pumps and valves in the cooling water circulation loop are opened at the same time, part of the water enters the cooling tower and the tray, and the liquid level of the cooling water side 102 of the heat exchange tank drops sharply. If the water amount cannot be supplemented, 1 / 3 of the heat pipes are not immersed in the water, which seriously affects the heat exchange efficiency. If the water amount is supplemented to the set value and completely covers the heat pipes, when all the pumps and valves in the cooling water circulation loop are closed at the same time, a large amount of water flows from the cooling tower and the tray into the cooling water side of the heat exchange tank, which can cause the cooling water to overflow and exist safety hazards.

[0060] In order to solve the problems caused by directly opening or closing the cooling water circulation loop, the control device D in the embodiment of the present application is also used to detect the liquid level state in the heat dissipation device in real time, and when the current liquid level of the heat dissipation device reaches or exceeds the preset upper limit threshold of the heat dissipation device liquid level, a cooling water valve starting instruction is generated, and at the same time, the liquid level state in the cooling water flow space is detected in real time, and the operating frequency of the cooling water circulating pump is adjusted according to the cooling water flow space liquid level, so as to adjust the cooling water discharge capacity.

[0061] Further, the control device D in the embodiment of the present application is also used to detect the liquid level state in the heat dissipation device 6 and the liquid level state in the cooling water flow space A2 in real time, and according to the real-time heat dissipation device liquid level data and the cooling water flow space liquid level state data, the starting time of the cooling water valve and the operating frequency of the cooling water circulating pump 4 are controlled, so as to maintain the stable state of the cooling water discharge capacity. Specifically, the cooling water control unit D4 in the control device D is used to receive and detect the heat dissipation device liquid level data collected by the heat dissipation device liquid level meter 61 in real time, and the cooling water flow space liquid level state data collected by the cooling water flow space liquid level meter 1021 (which is also electrically connected with the cooling water control unit D4 in the control device D) in real time, and according to the dynamic change state of the heat dissipation device liquid level data, the starting time of the cooling water valve is controlled to control the opening and closing time of the cooling water valve, and according to the dynamic change state of the cooling water flow space liquid level state data, the operating frequency of the cooling water circulating pump 4 is adjusted to adjust the cooling water discharge capacity.

[0062] Further, when the cooling water control unit D4 in the control device D detects that the real-time heat dissipation device liquid level data reaches or exceeds the preset upper limit threshold of the heat dissipation device liquid level, a cooling water valve starting instruction is immediately generated, and the opening and opening degree of the cooling water valve are controlled by the cooling water valve starting instruction, or when the cooling water control unit D4 in the control device D detects that the real-time heat dissipation device liquid level data does not reach the upper limit threshold of the heat dissipation device liquid level, the cooling water valve starting instruction is not generated, so that the cooling water valve remains in the closed state. And when the cooling water control unit D4 in the control device D detects that the real-time cooling water flow space liquid level data reaches or exceeds the normal liquid level threshold of the cooling water flow space, the cooling water circulating pump 4 is started or the operating frequency of the cooling water circulating pump 4 is adjusted (increased), or when the cooling water control unit D4 in the control device D detects that the real-time cooling water flow space liquid level data does not reach the normal liquid level threshold of the cooling water flow space, the discharge pump 2 is stopped or the operating frequency of the discharge pump 2 is adjusted (decreased), so that the control device D is used to automatically control the stable state of the cooling water flow space liquid level.

[0063] Further, the control device D in the embodiment of the present application is also used to control the cooling water circulating pump 4 to be in a low frequency operation state, and generate a cooling water valve closing instruction after a preset time period. The cooling water control unit D4 in the control device D is also used to detect the liquid level state in the cooling water flowing space in real time, and adjust the operation frequency of the cooling water circulating pump according to the liquid level of the cooling water flowing space, so as to keep the liquid level of the cooling water flowing space stable.

[0064] Further, the embodiment of the present application is used to start the cooling water circulating pump 4 first when the cooling water circulation is started, and the cooling water enters the cooling tower 6 through the pipeline. When the cooling tower tray liquid level 61 is higher than the upper limit, the cooling water valve 9 is opened. The tray water enters the cooling water side 102, and the cooling water pump 4 discharge capacity is controlled through the cooling water side liquid level 1021. In this way, the stable circulation is gradually established. In addition, when the cooling water side circulation is closed, the cooling water pump 4 is first operated at a low frequency, and the cooling water valve 9 is closed after 15s. At the same time, the operation frequency of the cooling water pump 4 is controlled according to the cooling water side liquid level, so as to keep the cooling water side liquid level stable, thereby ensuring that the tray and the cooling water side 102 do not appear to overflow.

[0065] Therefore, the present application uses the cooling water circulating flow channel formed by the cooling water circulating loop and the cooling water flowing space. The low temperature cooling water is first introduced from the inlet of the cold water side of the heat exchange tank which is on the same side as the mud side outlet of the heat exchange tank, so that the cooling water in the cooling water flowing space and the mud flowing direction are opposite. The temperature of the cooling water is raised after extracting heat through the heat pipe heat exchanger, and the cooling water flows out from the other side outlet. The temperature of the cooling water is raised after the cooling water is transported to the cooling tower through the cooling pump, and the cooling water is cooled through the evaporation cooling process in the air. After the cooling water is cooled, the cooling water is introduced into the cold water side of the cooling tank heat exchange tank again through the cooling water delivery pump, so as to realize the automatic control of the discharge pump, the discharge pump, the self-circulating pump and the cooling water pump discharge capacity through the liquid level height of the mud pool before and after cooling, and the temperature difference between the mud side and the cooling water side.

[0066] Further, as shown in FIG. 1, the cooling water circulating loop is used to form a cooling water circulating flow channel with the cooling water flowing space. Figure 2As shown, the high-temperature mud is pumped to one side of the heat exchange tank mud side 101 through the mud circulating pipeline 3, and fully contacts the evaporation end of the cavity heat pipe 12, so that the heat is transferred to the low-temperature cooling water through the heat pipe heat exchanger. The cooled mud flows out from the other side of the heat exchange tank mud side 101 under the action of the mud pump 2, enters the drilling circulation, and completes other drilling processes on site. At the same time, the low-temperature cooling water enters the heat exchange tank cooling water side 102 through the cooling water circulating pipeline 5, contacts the condensation end of the heat pipe 12, and exchanges heat. The heated cooling water flows out from the other side of the heat exchange tank cooling water side 102, and is transported to the heat dissipation device cooling tower 6 through the cooling water circulating pipeline 5 by the cooling water circulating pump 4. After evaporative cooling, it flows back to the heat exchange tank cooling water side 102 under the action of gravity, and realizes cooling water circulation cooling in turn. The mud circulating direction is opposite to the high-temperature mud circulating direction, which improves the heat exchange efficiency.

[0067] Based on the drilling fluid cooling control system, the embodiment of the present application further provides an industrial processing system. Figure 4 The structure of the industrial processing system of the embodiment of the present application is shown in the figure. Figure 4 As shown, the industrial processing system of the embodiment of the present application comprises a drilling fluid cooling control system 41 and a client 42. The client 42 communicates with the control device in the drilling fluid cooling control system 41.

[0068] Specifically, the control device D in the drilling fluid cooling control system 41 can be used to store the cooling control rules.

[0069] Further, each electric pump and electric valve involved in the drilling fluid cooling control system 41 is connected with the control device D through the field bus. The control device D is also used to obtain user instructions through the client 42, so as to select the valves and / or pumps controlled in the current drilling fluid cooling control system 41 by using the user instructions, so that the control device D controls the selected valve devices and / or pump devices by starting and stopping and frequency adjustment control according to the cooling control rules.

[0070] In addition, the control device D is also used to record and store the well site production data.

[0071] The client 42 is used to edit the preset cooling control rules, and set and select the thresholds involved in the preset cooling control rules. In addition, the client 42 is also used to display the well site production data recorded by the control device.

[0072] The application discloses a drilling fluid cooling control system and an industrial processing system.

[0073] The above merely describes the preferred embodiments of the present application, but the protection scope of the present application is not limited to this, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

[0074] It should be understood that the embodiments disclosed herein are not limited to the particular structures, process steps, or materials disclosed herein but are extended to equivalents thereof. It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting.

[0075] Reference throughout this specification to "an embodiment" or "the embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, appearances of the phrases "an embodiment" or "in one embodiment" in various places throughout this specification are not necessarily referring to the same embodiment.

[0076] Although the embodiments disclosed by the present application are as above, the content described is only the embodiments adopted for the purpose of facilitating the understanding of the present application, and is not intended to limit the present application. Any person skilled in the art of the present application can make any modification and change in the implementation form and details without departing from the spirit and scope of the present application, but the patent protection scope of the present application should be subject to the scope defined by the attached claims.

Claims

1. A control system for drilling fluid cooling, comprising: a heat exchange tank, which is divided into a mud flow space and a cooling water flow space by a partition, and is used for transferring heat of mud in the mud flow space to cooling water in the cooling water flow space by heat pipes penetrating both spaces simultaneously to cool the mud; a mud circulating loop, which is used for delivering the mud to be cooled to the mud flow space and delivering the cooled mud back to a wellbore after the cooling process is completed by the heat pipes; a cooling water circulating loop, which is used for forming a cooling water circulating flow channel with the cooling water flow space after being started and cooling the cooling water in the current flow channel; a control device, which is used for automatically controlling the mud cooling process and the cooling water cooling process by using preset cooling control rules, wherein the cooling water circulating loop comprises: a cooling water circulating pump, which is connected with an outlet of the cooling water flow space and an inlet of a heat dissipation device respectively, and is used for being started under control of a cooling water circulating start instruction and delivering the cooling water in the cooling water flow space to the heat dissipation device; the heat dissipation device, which is used for being started under control of the cooling water circulating start instruction and cooling the delivered cooling water by using an evaporative cooling technology; a cooling water valve, which is connected with an outlet of the heat dissipation device and an inlet of the cooling water flow space through a cooling water circulating pipeline respectively, and is used for being started under control of a cooling water valve start instruction to deliver the cooling water in the heat dissipation device back to the cooling water flow space, wherein the cooling water valve start instruction is formed by lagging behind the cooling water circulating start instruction; a water replenishing valve, which is communicated with the cooling water flow space and is used for being opened under control of a water replenishing instruction to deliver cooling water into the cooling water flow space, wherein the control device is further used for detecting a liquid level state in the heat dissipation device and a liquid level state in the cooling water flow space in real time, and controlling a starting time of the cooling water valve and a running frequency of the cooling water circulating pump according to real-time heat dissipation device liquid level data and cooling water flow space liquid level state data, so as to keep a stable state of cooling water displacement and make the cooling water in the cooling water flow space completely cover the heat pipes, and the control device is further used for detecting a liquid level state of the mud flow space in real time, and generating the water replenishing instruction for opening and closing and opening degree control of the water replenishing valve based on the liquid level state.

2. The control system of claim 1, wherein, the mud circulating loop comprises: a first mud pool, which is communicated with a well site drilling fluid circulating system and an inlet of the mud flow space respectively, and is used for storing the mud to be cooled and pumping the mud to be cooled into the mud flow space by using an internal mud pumping pump; a second mud pool, which is communicated with an outlet of the mud flow space through a mud discharging pump, and is used for delivering the cooled mud and delivering it back to the wellbore under control of the mud discharging pump. 3.The control system according to claim 2, wherein The control device is further configured to detect the liquid level state in the second mud pit in real time, and based on this, adjust the operating frequency of the mud discharge pump to keep the liquid level state in the second mud pit stable.

4. The control system according to any one of claims 1-3, characterized in that, The control device is further configured to detect the liquid level state in the mud flow space in real time, and based on this, adjust the operating frequency of the mud suction pump in the mud circulation loop to keep the liquid level state in the mud flow space stable.

5. The control system of any one of claims 1-3, wherein, The heat exchange tank further comprises: A mud self-circulation device in communication with the mud flow space, configured to, under the control of a self-circulation start instruction, extract mud in the mud flow space to circulate the mud in a self-circulation manner, and return the circulated mud to the mud flow space, wherein an array of temperature sensors is arranged on the inner wall of the mud flow space, and The control device is further configured to monitor the real-time internal temperature of the mud flow space through the array of temperature sensors, and generate the self-circulation start instruction when the internal temperature exceeds a preset self-circulation start temperature threshold.

6. The control system according to claim 5, characterized in that, The control device is further configured to detect the inlet temperature and outlet temperature of the mud flow space in real time, and based on this, adjust the operating frequency of the self-circulation pump in the mud self-circulation device to control the pump displacement of the self-circulation process.

7. The control system according to claim 1, characterized in that, The control device is further configured to detect the liquid level state in the heat dissipation device in real time, and generate the cooling water valve start instruction when the current liquid level of the heat dissipation device reaches or exceeds a preset upper limit threshold of the heat dissipation device liquid level, and detect the liquid level state in the cooling water flow space in real time, and adjust the operating frequency of the cooling water circulation pump according to the cooling water flow space liquid level to adjust the cooling water displacement.

8. The control system according to claim 1 or 7, characterized in that, The control device is further configured to first control the cooling water circulation pump to be in a low-frequency operating state, and after a preset time period, generate a cooling water valve closing instruction, wherein the liquid level state in the cooling water flow space is detected in real time, and the operating frequency of the cooling water circulation pump is adjusted according to the cooling water flow space liquid level to keep the liquid level of the cooling water flow space stable.

9. The control system of any one of claims 1-3, wherein, The mud flow direction in the mud circulation loop is opposite to the cooling water flow direction in the cooling water circulation loop.

10. An industrial processing system, characterized by The industrial processing system comprises: The drilling fluid cooling control system according to any one of claims 1-9; A client in communication with the control device in the control system, configured to edit the preset cooling control rule and set each threshold involved in the preset cooling control rule.

11. The industrial processing system according to claim 10, characterized in that, The control device is further configured to record well site production data and store.

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