Small-sized oil-based drilling fluid clean production line

Abstract

The present application relates to the technical field of drilling fluid production, and particularly relates to a small oil-based drilling fluid clean production line, which comprises a mixing part, a feeding part, a heating part, a degassing part and a controller. The raw material mixture is received by the feeding part and discharged into the heating part through the pressure pump, so that the transfer storage capacity of the raw material mixture is improved, and the feeding speed is controllable. The air outlet layer is arranged outside the edge of the gas collecting hood, so that a shielding air area is formed above and on the side of the heating part, the heating flue gas is prevented from overflowing the gas collecting hood, the high air flow rate of the edge of the air outlet layer accelerates the flue gas flow to the gas collecting hood, the efficiency of the gas collecting hood for collecting flue gas is improved, the power of the induced draft fan and the annular fan is set and corrected in real time according to the real-time smoke concentration and the real-time gas temperature, the degassing process is accurately controlled, high heat loss in the heating part is avoided, and the continuous clean production of the oil-based drilling fluid is ensured.

Description

Technical Field

[0001] This invention relates to the field of drilling fluid production technology, and in particular to a small-scale clean production line for oil-based drilling fluid. Background Technology

[0002] Currently, drilling fluids used in unconventional oil and gas resource development include water-based and oil-based drilling fluids. Compared with water-based drilling fluids, oil-based drilling fluids have many advantages, such as resistance to high temperatures and salt and calcium intrusion, good wellbore stability, good lubrication, and less damage to oil and gas reservoirs. They have become an important means of drilling challenging high-temperature deep wells, highly deviated directional wells, horizontal wells, and various complex formations. They can also be widely used as unsticking fluids, perforation completion fluids, workover fluids, and core sampling fluids. However, the preparation cost of oil-based drilling fluids is much higher than that of water-based drilling fluids, and their use often has a serious impact on the ecological environment near the well site. Moreover, the mechanical drilling rate is generally higher compared to the use of water-based drilling fluids.

[0003] Chinese Patent Publication No. CN110157395A discloses an oil-based drilling fluid shearing agent composition, an oil-based drilling fluid shearing agent product, its preparation method, and an oil-based drilling fluid. The technical point is that the shear force of the oil-based drilling fluid is adjusted by adding a shearing agent. It is evident that current oil-based drilling fluid production involves single-stage processing with large equipment, performing matching, stirring, and heating operations in a single operation. This results in the volatilization of flue gas from the oil-based drilling fluid mixture due to high-temperature operation, severely impacting the operating environment and polluting the surrounding atmosphere. While existing technologies address flue gas treatment, this typically leads to significant heat loss, resulting in insufficient high-temperature treatment of the oil-based drilling fluid and affecting its production quality. Summary of the Invention

[0004] To address this issue, the present invention provides a small-scale clean production line for oil-based drilling fluids, which overcomes the problem of insufficient flue gas volatilization treatment during the high-temperature preparation of oil-based drilling fluid mixtures in the prior art, resulting in high heat loss and atmospheric pollution.

[0005] To achieve the above objectives, the present invention provides a small-scale oil-based drilling fluid clean production line, comprising:

[0006] The mixing section is used to add various raw materials for oil-based drilling fluid and mix and stir them to generate a raw material mixture, which is then discharged through a discharge pipe. The mixing section is equipped with a stirring device that can detect the real-time stirring speed of the stirring impeller and has adjustable output power.

[0007] The feed section receives the raw material mixture discharged from the discharge pipe and forces the raw material mixture into the conveying pipe by a pressure pump, the output power of which is adjustable.

[0008] A heating section is provided on one side of the feed section to receive the raw material mixture output from the conveying pipe. The heating section is equipped with a heating device to heat the raw material mixture inside the heating section.

[0009] The degassing section is used to collect the heated flue gas generated by the heating section and to perform liquefaction and sedimentation treatment on the collected heated flue gas. The degassing section includes a gas collection hood disposed on the upper side of the heating section, an induced draft fan inside the gas collection hood, and a water-cooled box connected to the induced draft fan through an air guide pipe. The gas collection hood is provided with an air outlet layer, which is connected to an annular fan. A temperature sensor and a first smoke concentration sensor are also disposed on the inner side of the gas collection hood, and a second smoke concentration sensor is disposed on the outer side of the gas collection hood.

[0010] The controller is connected to the mixing section, the feeding section, the heating section, and the degassing section respectively. The controller can determine the real-time smoke concentration inside the gas collection hood detected by the first smoke concentration sensor according to the set standard smoke concentration range, control the opening status of the induced draft fan and the annular fan, and when the real-time smoke concentration is higher than the standard smoke concentration range, control the operation of the induced draft fan according to the real-time output power set according to the real-time smoke concentration and the standard smoke concentration, and correct the set real-time output power according to the real-time gas temperature inside the gas collection hood.

[0011] Furthermore, the controller is equipped with a standard smoke concentration Gb and a standard smoke concentration difference ΔGb, and also has a preset induced draft power Wy. When the heating unit heats the raw material mixture, the first smoke concentration sensor detects the real-time smoke concentration Gs inside the gas collection hood. The controller calculates the real-time smoke concentration difference ΔGs based on the real-time smoke concentration Gs and the standard smoke concentration Gb, where ΔGs = |Gb - Gs|, and compares the real-time smoke concentration difference ΔGs with the standard smoke concentration difference ΔGb.

[0012] When ΔGs≤ΔGb, the controller determines that the real-time smoke concentration inside the gas collection hood is within the standard smoke concentration range. The controller will then start the induced draft fan with a preset induced draft power Wy to discharge the smoke inside the gas collection hood into the water-cooled box through the air guide pipe for cooling and liquefaction.

[0013] When ΔGs > ΔGb, the controller determines that the real-time smoke concentration inside the gas collection hood is not within the standard smoke concentration range. The controller will then compare the standard smoke concentration with the real-time smoke concentration to determine the smoke concentration status inside the gas collection hood.

[0014] Furthermore, the controller is equipped with a preset air supply power We. When the controller determines that the real-time smoke concentration inside the fume collection hood is not within the standard smoke concentration range, it will determine the real-time smoke concentration Gs inside the fume collection hood based on the standard smoke concentration Gb.

[0015] When Gs < Gb, the controller determines that the real-time smoke concentration inside the gas collection hood is lower than the standard smoke concentration, and the controller will control the induced draft fan to turn off or control the induced draft fan to remain off.

[0016] When Gs > Gb, the controller determines that the real-time smoke concentration inside the gas collection hood is higher than the standard smoke concentration. The controller will control the annular fan to start with a preset air supply power We, and supply air through the air outlet layer set at the edge of the gas collection hood. The controller will start the induced draft fan with a preset induced draft power Wy, and adjust the preset induced draft power of the induced draft fan in real time according to the real-time smoke concentration and the standard smoke concentration.

[0017] Furthermore, when the controller determines that the real-time smoke concentration inside the gas collection hood is higher than the standard smoke concentration, it will turn on the induced draft fan with a preset induced draft power Wy, and control the real-time output power Ws of the induced draft fan in real time, setting Ws = Wy × [1 + (Gs - Gb) / Gb], and determine the real-time gas temperature inside the gas collection hood to determine whether to correct the set real-time output power Ws.

[0018] Furthermore, the controller is equipped with a standard gas collection temperature Tb. When the controller performs real-time control of the real-time output power of the induced draft fan, the temperature sensor will detect the real-time gas temperature Ts inside the gas collection hood. The controller will then compare the real-time gas temperature Ts inside the gas collection hood with the set standard gas collection temperature Tb.

[0019] When Ts < Tb, the controller will determine that the real-time gas temperature inside the gas collection hood is lower than the standard gas collection temperature. The controller will correct the real-time output power Ws to Ws' based on the real-time gas temperature Ts and the standard gas collection temperature Tb, Ws' = Ws × (Ts / Tb). The controller will control the operation of the induced draft fan with the corrected real-time output power Ws'.

[0020] When Ts≥Tb, the controller will determine that the real-time gas temperature inside the gas collection hood is not lower than the standard gas collection temperature, and the controller will not correct the set real-time output power Ws.

[0021] Furthermore, when the controller corrects the real-time output power Ws to Ws', it compares the corrected real-time output power Ws' with the preset induced draft power Wy.

[0022] When Ws' < Wy, the controller determines that the corrected real-time output power is lower than the preset induced draft power, and the controller will issue an alarm through the alarm light.

[0023] When Ws'≥Wy, the controller determines that the corrected real-time output power is not lower than the preset induced draft power. The controller will then determine the external smoke concentration of the gas collection hood to determine whether to control the real-time air supply power of the annular fan.

[0024] Furthermore, the controller is equipped with a standard ambient smoke concentration Gh. After the controller corrects the real-time output power of the induced draft fan, and the corrected real-time output power is not lower than the preset induced draft power, the second smoke concentration sensor will detect the external smoke concentration Gf outside the gas collection hood and compare the external smoke concentration Gf with the standard ambient smoke concentration Gh.

[0025] When Gf≤Gh, the controller determines that the external smoke concentration outside the gas collection hood does not exceed the standard ambient smoke concentration, and therefore does not control the real-time air supply power of the annular fan.

[0026] When Gf > Gh, the controller determines that the external smoke concentration outside the gas collection hood has exceeded the standard environmental smoke concentration. The controller will set the real-time air supply power Wr of the annular fan, Wr = We × [1 + (Gf - Gh) / Gh], and control the operation of the annular fan with the set real-time air supply power Wr.

[0027] Furthermore, the controller is also equipped with a maximum flue gas leakage time Mc. When the controller determines that the external smoke concentration outside the gas collection hood has exceeded the standard ambient smoke concentration, it will start the flue gas leakage timer and compare the real-time flue gas leakage time Ms with the maximum flue gas leakage time Mc.

[0028] When Ms≤Mc, the controller determines that the real-time flue gas leakage time has not exceeded the maximum flue gas leakage time, and the controller does not adjust the operating status of the degassing unit;

[0029] When Ms > Mc, the controller determines that the real-time flue gas leakage time has exceeded the maximum flue gas leakage time, and the controller will issue an alarm through the alarm light.

[0030] The controller uses the moment when the external smoke concentration Gf exceeds the standard ambient smoke concentration Gh as the start point of timing and the moment when the external smoke concentration Gf is less than or equal to the standard ambient smoke concentration Gh as the end point of timing. When the end point of timing occurs, the real-time smoke leakage duration is reset to zero.

[0031] Furthermore, the controller is also equipped with a standard stirring speed range and a stable stirring duration Mn. When the stirring device mixes the various production materials in the mixing section, it can transmit the detected real-time stirring speed of the stirring impeller to the controller. When the controller determines that the real-time stirring speed of the stirring impeller is within the standard stirring speed range, it starts the stable stirring timer and compares the result of the stable stirring timer, the real-time temperature stirring duration Md, with the set stable stirring duration Mn.

[0032] When Md < Mn, the controller determines that the raw materials have not been properly mixed.

[0033] When Md≥Mn, the controller determines that the mixing of each raw material has been completed and discharges the mixed raw material mixture to the feed section through the discharge pipe.

[0034] Furthermore, a water replenishment tank and an oil replenishment tank are also provided on one side of the feeding section, and a gas detection device is also provided in the gas guide pipe to detect the real-time oil and gas concentration, real-time water vapor concentration and real-time flue gas velocity in the gas guide pipe. The controller calculates the real-time oil and gas loss based on the real-time oil and gas concentration and the real-time flue gas velocity, calculates the real-time water and gas loss based on the real-time water vapor concentration and the real-time flue gas velocity, and controls the water replenishment tank and the oil replenishment tank to replenish the raw material mixture in the feeding section according to the real-time oil and gas loss and the real-time water and gas loss, respectively.

[0035] Compared with the prior art, the beneficial effects of the present invention are as follows: by setting a stirring device in the mixing section to provide feedback on the real-time rotation speed of the stirring impeller, the uniformity of the mixing of each raw material in the mixing section can be accurately determined; by setting a feeding section to receive the raw material mixture and discharging it into the heating section through a pressure pump, the transfer and storage capacity of the raw material mixture is improved, and the feeding speed of the heating section is controlled; the gas collection hood in the degassing section collects the heating flue gas generated when heating the raw materials in the heating section, and the flue gas is discharged by an induced draft fan and cooled and liquefied, ensuring the clean treatment of the processing flue gas; and at the same time, a gas collection hood is set on the outer edge of the gas collection hood. The exhaust layer, driven by an independent annular fan, creates a shielded airflow area above and to the side of the heating section, preventing heated flue gas from overflowing the gas collection hood. Simultaneously, due to the high airflow velocity within this shielded airflow area, the heated flue gas can quickly flow into the gas collection hood along the inner side of the shielded airflow area, improving the efficiency of the gas collection hood in collecting flue gas. Furthermore, a controller is installed to set and adjust the power of the induced draft fan and annular fan in real time based on the real-time smoke concentration and gas temperature, accurately controlling the degassing process and preventing high heat loss within the heating section, while ensuring the continuous and clean production of oil-based drilling fluid.

[0036] In particular, by setting a standard smoke concentration and a standard smoke concentration difference within the controller to form a standard smoke concentration range, and calculating the real-time smoke concentration difference based on the real-time smoke concentration and the standard smoke concentration, the deviation of the real-time smoke concentration in the gas collection hood from the standard is represented. When the real-time smoke concentration difference is less than or equal to the standard smoke concentration difference, it is determined that the real-time smoke concentration is within the standard smoke concentration range, and the induced draft fan is directly started with a preset induced draft power to treat the flue gas, thereby reducing the pollution of oil-based drilling fluid flue gas to the production environment and improving the cleanliness of the oil-based drilling fluid production line.

[0037] Furthermore, when the real-time smoke concentration inside the gas collection hood is outside the standard smoke concentration range, the standard smoke concentration is compared with the real-time smoke concentration Gs. If the real-time smoke concentration is lower than the standard smoke concentration, it indicates that there is less smoke inside the gas collection hood, and the heating section is in a relatively stable or initial stage of operation. Therefore, the induced draft fan is kept off to minimize heat loss of drilling fluid raw materials in the heating section. If the real-time smoke concentration is higher than the standard smoke concentration, it indicates that there is more smoke inside the gas collection hood. Therefore, the induced draft fan is turned on for degassing, and the annular fan is turned on to prevent smoke from overflowing, ensuring the clean production of oil-based drilling fluid and avoiding environmental pollution.

[0038] Furthermore, when the real-time smoke concentration inside the gas collection hood is higher than the standard smoke concentration, the induced draft fan is turned on with a preset induced draft power for degassing. The output power of the induced draft fan is set in real time according to the actual real-time smoke concentration. When the smoke concentration is relatively low, the heat loss of drilling fluid can be minimized and the production quality of drilling fluid can be improved. When the smoke concentration is relatively high, a larger induced draft power is used for degassing to improve the efficiency of flue gas treatment and avoid flue gas pollution.

[0039] Furthermore, by setting a standard gas collection temperature in the controller, the heating status of the oil-based drilling fluid in the heating section is ensured. When the real-time gas temperature inside the gas collection hood is lower than the standard gas collection temperature, the real-time output power of the induced draft fan is corrected. This indicates that the degassing intervention of the induced draft fan has caused a large heat loss. Therefore, the set real-time output power is corrected according to the real-time gas temperature and the standard gas collection temperature. By reducing the real-time output power of the induced draft fan, the heat loss is reduced, thereby determining the production quality of the oil-based drilling fluid.

[0040] In particular, by comparing the corrected real-time output power with the preset induced draft power, it is determined whether the power of the corrected induced draft fan can meet the basic degassing requirements. When the real-time output power is lower than the preset induced draft power, it indicates that the balance between flue gas degassing and heat loss maintenance can no longer be guaranteed on the basis of the basic degassing requirements. This is mostly due to the hardware failure of the set fan and the hardware failure of the heating unit. Therefore, an alarm operation is performed to avoid pollution of the environment by oil-based drilling fluid flue gas.

[0041] Furthermore, by detecting the external smoke concentration outside the gas collection hood and adjusting the real-time air supply power of the annular fan, the sealing and shielding efficiency of the gas collection hood's outlet layer is controlled. By setting the maximum flue gas leakage time, the duration of the actual external smoke concentration exceeding the standard environmental smoke concentration is determined to determine whether the gas collection hood's outlet layer can effectively shield the smoke, thereby further improving the efficiency of oil-based drilling fluid flue gas treatment and ensuring the clean production of oil-based drilling fluid.

[0042] Furthermore, the controller can combine multiple controllable components in the production line to adjust production in real time. It can monitor the mixing status of the mixing section in real time according to the set value, and determine whether each raw material has been mixed completely based on the standard mixing speed range and the duration of continuous and stable mixing. This further improves the automation of the production line and the production quality. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the structure of the small-scale oil-based drilling fluid clean production line in this embodiment. Detailed Implementation

[0044] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0045] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0046] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0047] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0048] Please see Figure 1The diagram shown is a structural schematic of a small-scale oil-based drilling fluid clean production line according to this embodiment. This embodiment provides a small-scale oil-based drilling fluid clean production line, including: a mixing unit 1, a discharge pipe 101, a stirring device 102, a stirring impeller 103, a feeding unit 2, a pressure pump 201, a conveying pipe 202, a water replenishment tank 203, an oil replenishment tank 204, a heating unit 3, a heating device 301, a degassing unit 4, a gas collection hood 401, an induced draft fan 402, a gas guiding pipe 403, a water cooling box 404, an air outlet layer 4011, a ring fan 405, a temperature sensor 406, a first smoke concentration sensor 407, a second smoke concentration sensor 408, a gas detection device 4031, and a controller (not shown in the diagram).

[0049] The mixing section 1 is used to add the various raw materials for oil-based drilling fluid and mix and stir the raw materials to generate a raw material mixture, which is then discharged through the discharge pipe 101. The mixing section 1 is equipped with a stirring device 102, which can detect the real-time stirring speed of the stirring impeller 103 and the output power of the stirring device 102 is adjustable.

[0050] The feed section 2 is used to receive the raw material mixture discharged from the discharge pipe 101 and to press the raw material mixture into the conveying pipe 202 by the pressure pump 201, the output power of the pressure pump 201 being adjustable;

[0051] Heating section 3 is disposed on one side of the feed section 2 to receive the raw material mixture output from the conveying pipe 202. Heating device 301 is disposed inside the heating section 3 to heat the raw material mixture inside the heating section 3.

[0052] The degassing section 4 is used to collect the heating flue gas generated by the heating section 3 and to perform liquefaction and sedimentation treatment on the collected heating flue gas. The degassing section 4 includes a gas collection hood 401 disposed on the upper side of the heating section 3, an induced draft fan 402 inside the gas collection hood 401, and a water-cooled box 404 connected to the induced draft fan 402 through an air guide pipe 403. The gas collection hood 401 is provided with an air outlet layer 4011, which is connected to a ring fan 405. A temperature sensor 406 and a first smoke concentration sensor 407 are also disposed on the inner side of the gas collection hood 401, and a second smoke concentration sensor 408 is disposed on the outer side of the gas collection hood 401.

[0053] The controller is connected to the mixing unit 1, the feeding unit 2, the heating unit 3, and the degassing unit 4 respectively. The controller can determine the real-time smoke concentration inside the gas collection hood 401 detected by the first smoke concentration sensor 407 according to the set standard smoke concentration range, control the opening state of the induced draft fan 402 and the annular fan 405, and control the operation of the induced draft fan 402 according to the real-time output power set according to the real-time smoke concentration and the standard smoke concentration when the real-time smoke concentration is higher than the standard smoke concentration range. The controller also corrects the set real-time output power according to the real-time gas temperature inside the gas collection hood 401.

[0054] By providing feedback on the real-time rotation speed of the impeller 103 via a stirring device 102 within the mixing section 1, the uniformity of mixing of each raw material in the mixing section 1 can be accurately determined. The feeding section 2 receives the raw material mixture and discharges it into the heating section 3 via a pressure pump 201, improving the transfer and storage capacity of the raw material mixture and ensuring controllable feeding speed into the heating section 3. The gas collection hood 401 of the degassing section 4 collects the heating fumes generated during raw material heating in the heating section 3, and the fumes are discharged by the induced draft fan 402 and cooled and liquefied, ensuring clean treatment of the processing fumes. Simultaneously, an air outlet layer 4011 is provided on the outer edge of the gas collection hood 401, from which... An independent annular fan 405 drives the airflow, forming a shielded airflow area above and to the side of the heating section 3. This prevents the heated flue gas from overflowing the gas collection hood 401. At the same time, due to the high airflow velocity in the shielded airflow area, the heated flue gas can quickly flow into the gas collection hood 401 along the inner side of the shielded airflow area, improving the efficiency of the gas collection hood 401 in collecting flue gas. Furthermore, a controller is set to set and adjust the power of the induced draft fan 402 and the annular fan 405 in real time according to the real-time smoke concentration and real-time gas temperature, accurately controlling the degassing process and avoiding high heat loss in the heating section 3. This also ensures the continuous and clean production of oil-based drilling fluid.

[0055] Specifically, the controller is equipped with a standard smoke concentration Gb and a standard smoke concentration difference ΔGb, and also has a preset induced draft power Wy. When the heating unit 3 heats the raw material mixture, the first smoke concentration sensor 407 detects the real-time smoke concentration Gs inside the gas collection hood 401. The controller calculates the real-time smoke concentration difference ΔGs based on the real-time smoke concentration Gs and the standard smoke concentration Gb, where ΔGs = |Gb - Gs|, and compares the real-time smoke concentration difference ΔGs with the standard smoke concentration difference ΔGb.

[0056] When ΔGs≤ΔGb, the controller determines that the real-time smoke concentration inside the gas collection hood 401 is within the standard smoke concentration range. The controller will turn on the induced draft fan 402 with a preset induced draft power Wy to discharge the smoke inside the gas collection hood 401 into the water cooling box 404 through the air guide pipe 403 for cooling and liquefaction.

[0057] When ΔGs > ΔGb, the controller determines that the real-time smoke concentration inside the gas collection hood 401 is not within the standard smoke concentration range. The controller will compare the standard smoke concentration with the real-time smoke concentration to determine the smoke concentration status inside the gas collection hood 401.

[0058] By setting a standard smoke concentration and a standard smoke concentration difference within the controller to form a standard smoke concentration range, and calculating the real-time smoke concentration difference based on the real-time smoke concentration and the standard smoke concentration, the deviation of the real-time smoke concentration in the gas collection hood 401 from the standard is indicated. When the real-time smoke concentration difference is less than or equal to the standard smoke concentration difference, it is determined that the real-time smoke concentration is within the standard smoke concentration range, and the induced draft fan 402 is directly started with a preset induced draft power to treat the flue gas, thereby reducing the pollution of oil-based drilling fluid flue gas to the production environment and improving the cleanliness of the oil-based drilling fluid production line.

[0059] In this embodiment, taking an oil-based drilling fluid with an oil-water ratio of 80% / 20% as an example, the weight of a single heating is 200-300 kg, and the set standard smoke concentration range is 5000 mg / m³ to 20000 mg / m³, that is, the standard smoke concentration is set to 12500 and the standard smoke concentration difference is set to 7500 mg / m³. However, in actual production, it can also be adapted to the type of oil-based drilling fluid being processed, the single processing volume, and the thermal efficiency of the heating device 301.

[0060] In this embodiment, the detection values ​​of the first smoke concentration sensor 407 and the second smoke concentration sensor 408 are the sum of the concentrations of volatiles in each production raw material. The concentration of volatiles in each production raw material cannot be detected and calculated separately.

[0061] Specifically, the controller is equipped with a preset air supply power We. When the controller determines that the real-time smoke concentration inside the smoke collection hood 401 is not within the standard smoke concentration range, it will determine the real-time smoke concentration Gs inside the smoke collection hood 401 based on the standard smoke concentration Gb.

[0062] When Gs < Gb, the controller determines that the real-time smoke concentration inside the gas collection hood 401 is lower than the standard smoke concentration, and the controller will control the exhaust fan 402 to turn off or control the exhaust fan 402 to remain off.

[0063] When Gs > Gb, the controller determines that the real-time smoke concentration inside the gas collection hood 401 is higher than the standard smoke concentration. The controller will control the annular fan 405 to turn on with a preset air supply power We, and supply air through the air outlet layer 4011 set at the edge of the gas collection hood 401. The controller will turn on the induced draft fan 402 with a preset induced draft power Wy, and adjust the preset induced draft power of the induced draft fan 402 in real time according to the real-time smoke concentration and the standard smoke concentration.

[0064] When the real-time smoke concentration inside the gas collection hood 401 is not within the standard smoke concentration range, the standard smoke concentration is compared with the real-time smoke concentration Gs. If the real-time smoke concentration is lower than the standard smoke concentration, it means that there is less smoke inside the gas collection hood 401, and the heating section 3 is in a relatively stable or initial stage of operation. Therefore, the induced draft fan 402 is kept off to reduce the heat loss of drilling fluid raw materials in the heating section 3. If the real-time smoke concentration is higher than the standard smoke concentration, it means that there is more smoke inside the gas collection hood 401. Therefore, the induced draft fan 402 is turned on for degassing, and the annular fan 405 is turned on to prevent smoke from overflowing, thus ensuring the clean production of oil-based drilling fluid and avoiding environmental pollution.

[0065] In this embodiment, the preset air supply power is set to 2500 watts and the preset air induced power is set to 6300 watts, which are specifically set according to the type of fan used in production and the size of the air collection hood 401.

[0066] Specifically, when the controller determines that the real-time smoke concentration inside the gas collection hood 401 is higher than the standard smoke concentration, it will turn on the induced draft fan 402 with a preset induced draft power Wy, and control the real-time output power Ws of the induced draft fan 402 in real time. The controller sets Ws = Wy × [1 + (Gs - Gb) / Gb], and determines the real-time gas temperature inside the gas collection hood 401 to determine whether to correct the set real-time output power Ws.

[0067] When the real-time smoke concentration inside the gas collection hood 401 is higher than the standard smoke concentration, the induced draft fan 402 is turned on with a preset induced draft power to perform degassing. The output power of the induced draft fan 402 is set in real time according to the actual real-time smoke concentration. When the smoke concentration is relatively low, the heat loss of drilling fluid can be minimized and the production quality of drilling fluid can be improved. When the smoke concentration is relatively high, a larger induced draft power is used for degassing to improve the efficiency of flue gas treatment and avoid flue gas pollution.

[0068] Specifically, the controller is equipped with a standard gas collection temperature Tb. When the controller performs real-time control on the output power of the induced draft fan 402, the temperature sensor 406 will detect the real-time gas temperature Ts inside the gas collection hood 401. The controller will then compare the real-time gas temperature Ts inside the gas collection hood 401 with the set standard gas collection temperature Tb.

[0069] When Ts < Tb, the controller will determine that the real-time gas temperature inside the gas collection hood 401 is lower than the standard gas collection temperature. The controller will correct the real-time output power Ws to Ws' based on the real-time gas temperature Ts and the standard gas collection temperature Tb, Ws' = Ws × (Ts / Tb). The controller will control the operation of the induced draft fan 402 with the corrected real-time output power Ws'.

[0070] When Ts≥Tb, the controller will determine that the real-time gas temperature inside the gas collection hood 401 is not lower than the standard gas collection temperature, and the controller will not correct the set real-time output power Ws.

[0071] By setting a standard gas collection temperature in the controller, the heating state of the oil-based drilling fluid in the heating section 3 is ensured. When the real-time gas temperature inside the gas collection hood 401 is lower than the standard gas collection temperature, the real-time output power of the induced draft fan 402 is corrected. This indicates that the degassing intervention of the induced draft fan 402 has caused a large heat loss. Therefore, the set real-time output power is corrected according to the real-time gas temperature and the standard gas collection temperature. By reducing the real-time output power of the induced draft fan 402, the heat loss is reduced, thereby determining the production quality of the oil-based drilling fluid.

[0072] In this embodiment, the standard gas gathering temperature is set according to the type of oil-based drilling fluid, the heating temperature conditions, and the relative distance between the temperature sensor 406 and the drilling fluid surface, and is usually set to no less than 65 degrees Celsius.

[0073] Specifically, when the controller corrects the real-time output power Ws to Ws', it compares the corrected real-time output power Ws' with the preset induced draft power Wy.

[0074] When Ws' < Wy, the controller determines that the corrected real-time output power is lower than the preset induced draft power, and the controller will issue an alarm through the alarm light.

[0075] When Ws'≥Wy, the controller determines that the corrected real-time output power is not lower than the preset induced draft power. The controller will then determine the external smoke concentration of the gas collection hood 401 to determine whether to control the real-time air supply power of the annular fan 405.

[0076] By comparing the corrected real-time output power with the preset induced draft power, it is determined whether the power of the corrected induced draft fan 402 can meet the basic degassing requirements. When the real-time output power is lower than the preset induced draft power, it indicates that the balance between flue gas degassing and heat loss maintenance can no longer be guaranteed on the basis of the basic degassing requirements. This is mostly due to the hardware failure of the set fan and the hardware failure of the heating unit 3. Therefore, an alarm operation is performed to avoid pollution of the environment by oil-based drilling fluid flue gas.

[0077] Specifically, the controller is equipped with a standard ambient smoke concentration Gh. After the controller corrects the real-time output power of the induced draft fan 402, and the corrected real-time output power is not lower than the preset induced draft power, the second smoke concentration sensor 408 will detect the external smoke concentration Gf outside the gas collection hood 401 and compare the external smoke concentration Gf with the standard ambient smoke concentration Gh.

[0078] When Gf≤Gh, the controller determines that the external smoke concentration outside the gas collection hood 401 does not exceed the standard environmental smoke concentration, and therefore does not control the real-time air supply power of the annular fan 405.

[0079] When Gf > Gh, the controller determines that the external smoke concentration outside the gas collection hood 401 has exceeded the standard environmental smoke concentration. The controller will set the real-time air supply power Wr of the annular fan 405, Wr = We × [1 + (Gf - Gh) / Gh], and control the operation of the annular fan 405 with the set real-time air supply power Wr.

[0080] In this embodiment, the standard ambient smoke concentration is set to not exceed 230 mg / m³.

[0081] Specifically, the controller is also equipped with a maximum smoke leakage time Mc. When the controller determines that the external smoke concentration outside the gas collection hood 401 has exceeded the standard ambient smoke concentration, it will start the smoke leakage timer and compare the real-time smoke leakage time Ms with the maximum smoke leakage time Mc.

[0082] When Ms≤Mc, the controller determines that the real-time flue gas leakage time has not exceeded the maximum flue gas leakage time, and the controller does not adjust the operating status of the degassing unit 4;

[0083] When Ms > Mc, the controller determines that the real-time flue gas leakage time has exceeded the maximum flue gas leakage time, and the controller will issue an alarm through the alarm light.

[0084] The controller uses the moment when the external smoke concentration Gf exceeds the standard ambient smoke concentration Gh as the start point of timing and the moment when the external smoke concentration Gf is less than or equal to the standard ambient smoke concentration Gh as the end point of timing. When the end point of timing occurs, the real-time smoke leakage duration is reset to zero.

[0085] By detecting the external smoke concentration outside the gas collection hood 401 and adjusting the real-time air supply power of the annular fan 405, the sealing and shielding efficiency of the air outlet layer 4011 of the gas collection hood 401 is controlled. By setting the maximum smoke leakage time, the duration of the actual external smoke concentration exceeding the standard environmental smoke concentration is determined, thereby determining whether the air outlet layer 4011 of the gas collection hood 401 can effectively shield the smoke, further improving the smoke treatment efficiency of oil-based drilling fluid and ensuring the clean production of oil-based drilling fluid.

[0086] Specifically, the controller is also equipped with a standard stirring speed range and a stable stirring duration Mn. When the stirring device 102 mixes the various production raw materials in the mixing section 1, it can transmit the detected real-time stirring speed of the stirring impeller 103 to the controller. When the controller determines that the real-time stirring speed of the stirring impeller 103 is within the standard stirring speed range, it starts the stable stirring timer and compares the result of the stable stirring timer, the real-time temperature stirring duration Md, with the set stable stirring duration Mn.

[0087] When Md < Mn, the controller determines that the raw materials have not been properly mixed.

[0088] When Md≥Mn, the controller determines that the raw materials have been mixed and stirred, and discharges the mixed raw material mixture to the feed section 2 through the discharge pipe 101.

[0089] Furthermore, the controller in this embodiment can combine multiple controllable components in the production line to adjust production in real time. It can monitor the mixing state of the mixing unit 1 in real time according to the set value, and determine whether each raw material has been mixed completely based on the standard mixing speed range and the continuous stable mixing time. This further improves the automation of the production line and the production quality.

[0090] In this embodiment, the standard stirring speed range is set according to the stirring viscosity of each raw material after mixing and the rated power of the stirring device 102 and the model of the stirring impeller 103. In this embodiment, the standard stirring speed range is set to 240-242 r / min, and the stable stirring time is set to 30 seconds.

[0091] Specifically, a water replenishment tank 203 and an oil replenishment tank 204 are also provided on one side of the feed section 2. A gas detection device 4031 is also provided in the gas guide pipe 403 to detect the real-time oil and gas concentration, real-time water vapor concentration and real-time flue gas velocity in the gas guide pipe 403. The controller calculates the real-time oil and gas loss based on the real-time oil and gas concentration and the real-time flue gas velocity, calculates the real-time water and gas loss based on the real-time water vapor concentration and the real-time flue gas velocity, and controls the water replenishment tank 203 and the oil replenishment tank 204 to replenish the raw material mixture in the feed section 2 according to the real-time oil and gas loss and the real-time water and gas loss, respectively.

[0092] Simultaneously, the real-time flue gas flow rate in the gas guide pipe 403 and the detected real-time oil and gas concentration and real-time water vapor concentration are used to calculate the real-time water and gas loss and the real-time oil and gas loss, respectively. Water replenishment tank 203 and oil replenishment tank 204 are set up to replenish raw materials. However, the ratio of raw material components in production usually takes into account the consumption. Replenishment can also be made according to the actual loss and the set matching margin.

[0093] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

[0094] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A compact oil-based drilling fluid clean-up line, characterized in that, The application relates to a device for producing oil-based drilling fluid, which comprises a mixing and stirring part for feeding and mixing various raw materials of the oil-based drilling fluid to generate a raw material mixture and discharging the raw material mixture through a discharge pipeline, wherein a stirring device is arranged in the mixing and stirring part, the stirring device can detect the real-time stirring speed of a stirring impeller, and the output power of the stirring device is adjustable; a feeding part for receiving the raw material mixture discharged by the discharge pipeline and pressing the raw material mixture into a feeding pipeline through a pressure pump, wherein the output power of the pressure pump is adjustable; a heating part arranged on one side of the feeding part for receiving the raw material mixture output by the feeding pipeline, wherein a heating device is arranged in the heating part for heating the raw material mixture in the heating part; a gas removal part for collecting the heating flue gas generated by the heating part and performing liquid settling treatment on the collected heating flue gas, wherein the gas removal part comprises a gas collecting hood arranged on the upper side of the heating part, an air drafter arranged in the gas collecting hood, and a water cooling box connected with the air drafter through a gas guide pipeline, the gas collecting hood is provided with an air outlet layer connected with a ring-shaped air fan, a temperature sensor and a first smoke concentration sensor are further arranged on the inner side of the gas collecting hood, and a second smoke concentration sensor is arranged on the outer side of the gas collecting hood; and a controller connected with the mixing and stirring part, the feeding part, the heating part and the gas removal part respectively, the controller can determine the real-time smoke concentration in the gas collecting hood detected by the first smoke concentration sensor according to a set standard smoke concentration range, control the opening state of the air drafter and the ring-shaped air fan, and when the real-time smoke concentration is higher than the standard smoke concentration range, set the real-time output power according to the real-time smoke concentration and the standard smoke concentration to control the operation of the air drafter, and correct the set real-time output power according to the real-time gas temperature in the gas collecting hood. The controller is provided with a standard smoke concentration Gb and a standard smoke concentration difference Delta Gb, and is further provided with a preset air drafter power Wy, the first smoke concentration sensor detects the real-time smoke concentration Gs in the gas collecting hood when the heating part heats the raw material mixture, the controller calculates the real-time smoke concentration difference Delta Gs according to the real-time smoke concentration Gs and the standard smoke concentration Gb, Delta Gs = |Gb-Gs|, compares the real-time smoke concentration difference Delta Gs with the standard smoke concentration difference Delta Gb, when Delta Gs <= Delta Gb, the controller determines that the real-time smoke concentration in the gas collecting hood is within the standard smoke concentration range, and the controller opens the air drafter with the preset air drafter power Wy to discharge the flue gas in the gas collecting hood to the water cooling box through the gas guide pipeline for cooling and liquefaction; when Delta Gs > Delta Gb, the controller determines that the real-time smoke concentration in the gas collecting hood is not within the standard smoke concentration range, and the controller determines the smoke concentration state in the gas collecting hood by determining the standard smoke concentration and the real-time smoke concentration. ​ ​ 2. The compact oil-based drilling fluid cleaning production line according to claim 1, characterized in that, ​ ​ ​ 3. The compact oil-based drilling fluid cleaning production line according to claim 2, characterized in that, The controller is provided with a preset air supply power We, and when determining that the real-time smoke concentration inside the hood is not within the standard smoke concentration range, the controller determines the real-time smoke concentration Gs inside the hood according to the standard smoke concentration Gb, When Gs < Gb, the controller determines that the real-time smoke concentration inside the hood is lower than the standard smoke concentration, and the controller controls the air supply fan to be closed or to remain in the closed state; When Gs > Gb, the controller determines that the real-time smoke concentration inside the hood is higher than the standard smoke concentration, the controller controls the air supply fan to be opened at the preset air supply power We, air supply is performed through the air outlet layer arranged at the edge of the hood, the air supply fan is opened at the preset air supply power Wy, and the preset air supply power of the air supply fan is adjusted in real time according to the real-time smoke concentration and the standard smoke concentration.

4. The compact oil-based drilling fluid cleaning production line of claim 3, wherein, When determining that the real-time smoke concentration inside the hood is higher than the standard smoke concentration, the controller opens the air supply fan at the preset air supply power Wy, and controls the real-time output power Ws of the air supply fan in real time, Ws = Wy × [1 + (Gs - Gb) / Gb], and determines the real-time gas temperature inside the hood to determine whether to correct the set real-time output power Ws.

5. The compact oil-based drilling fluid cleaning production line of claim 4, wherein, The controller is provided with a standard hood temperature Tb, and when controlling the real-time output power of the air supply fan in real time, the temperature sensor detects the real-time gas temperature Ts inside the hood, the controller compares the real-time gas temperature Ts inside the hood with the set standard hood temperature Tb, When Ts < Tb, the controller determines that the real-time gas temperature inside the hood is lower than the standard hood temperature, the controller corrects the real-time output power Ws to Ws' according to the real-time gas temperature Ts and the standard hood temperature Tb, Ws' = Ws × (Ts / Tb), and the controller controls the air supply fan to operate at the corrected real-time output power Ws'; When Ts ≥ Tb, the controller determines that the real-time gas temperature inside the hood is not lower than the standard hood temperature, and the controller does not correct the set real-time output power Ws.

6. The compact oil-based drilling fluid cleaning production line of claim 5, wherein, When the real-time output power Ws is corrected to Ws', the controller compares the corrected real-time output power Ws' with the preset air supply power Wy, When Ws' < Wy, the controller determines that the corrected real-time output power has been lower than the preset air supply power, and the controller controls the air supply fan to be closed or to remain in the closed state; When Ws' ≥ Wy, the controller determines that the corrected real-time output power has not been lower than the preset air supply power, and the controller determines the smoke concentration outside the hood to determine whether to control the real-time air supply power of the air supply fan.

7. The compact oil-based drilling fluid cleaning production line according to claim 6, characterized in that, The controller is provided with a standard ambient smoke concentration Gh, and when the real-time output power of the air blower is corrected and the corrected real-time output power is not lower than the preset air blower power, the second smoke concentration sensor detects the external smoke concentration Gf outside the gas collecting hood and compares the external smoke concentration Gf with the standard ambient smoke concentration Gh, When Gf≤Gh, the controller determines that the external smoke concentration outside the gas collecting hood does not exceed the standard ambient smoke concentration, and controls not to control the real-time air supply power of the ring air blower; When Gf>Gh, the controller determines that the external smoke concentration outside the gas collecting hood exceeds the standard ambient smoke concentration, and sets the real-time air supply power Wr of the ring air blower, Wr=We×[1+(Gf-Gh) / Gh], and controls the ring air blower to operate at the set real-time air supply power Wr.

8. The compact oil-based drilling fluid cleaning production line according to claim 7, characterized in that, The controller is also provided with a maximum smoke leakage duration Mc, and when the controller determines that the external smoke concentration outside the gas collecting hood exceeds the standard ambient smoke concentration, the controller starts the smoke leakage timing and compares the real-time smoke leakage duration Ms with the maximum smoke leakage duration Mc, When Ms≤Mc, the controller determines that the real-time smoke leakage duration does not exceed the maximum smoke leakage duration, and the controller does not adjust the operating state of the gas removal part; When Ms>Mc, the controller determines that the real-time smoke leakage duration exceeds the maximum smoke leakage duration, and the controller will prompt alarm through the alarm lamp; Wherein, the controller is provided with a standard ambient smoke concentration Gh, and when the controller determines that the external smoke concentration Gf exceeds the standard ambient smoke concentration Gh, the timing starting node is generated, and when the external smoke concentration Gf is less than or equal to the standard ambient smoke concentration Gh, the timing end node is generated, and the real-time smoke leakage duration is cleared when the timing end node occurs.

9. The compact oil-based drilling fluid cleaning production line of claim 1, wherein, The controller is also provided with a standard stirring speed range and a stable stirring duration Mn, and when the stirring device mixes and stirs each production raw material in the mixing part, the real-time stirring speed of the stirring impeller is transmitted to the controller, and when the controller determines that the real-time stirring speed of the stirring impeller is within the standard stirring speed range, the stable stirring timing is started, and the real-time temperature stirring duration Md of the stable stirring timing result is compared with the set stable stirring duration Mn, When Md<Mn, the controller determines that the mixing and stirring of each production raw material is not completed; When Md≥Mn, the controller determines that the mixing and stirring of each production raw material is completed, and the mixed material after stirring is discharged to the feeding part through the discharge pipeline.

10. The compact oil-based drilling fluid cleaning production line of claim 1, wherein, The feeding part is also provided with a water supplement tank and an oil supplement tank, and the gas detection device is arranged in the gas guide pipeline to detect the real-time oil gas concentration, the real-time water vapor concentration and the real-time smoke flow rate in the gas guide pipeline. The controller calculates the real-time oil gas loss amount according to the real-time oil gas concentration and the real-time smoke flow rate, calculates the real-time water vapor loss amount according to the real-time water vapor concentration and the real-time smoke flow rate, and controls the water supplement tank and the oil supplement tank to supplement the raw material mixture in the feeding part according to the real-time oil gas loss amount and the real-time water vapor loss amount, respectively.

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