A treating agent, method and equipment for treating drilling mud

Abstract

This application provides a treatment agent, method, and apparatus for treating drilling mud, relating to the field of environmental protection technology. The treatment agent addresses the technical issue of low safety in current methods of heating drilling mud treatment. The treatment agent comprises a viscosity reducer, a water purifier, hexane, and ethyl acetate; the viscosity reducer, water purifier, hexane, and ethyl acetate are calculated by weight as follows: 1%-3% viscosity reducer, 1%-3% water purifier, 40%-50% hexane, and 40%-50% ethyl acetate, respectively. The treatment agent, method, and apparatus provided herein are used to treat drilling mud.

Description

Technical Field

[0001] The present application relates to the field of environmental protection technology, and in particular to a treatment agent, method and equipment for treating drilling mud. Background Art

[0002] During the oil and natural gas extraction process, a large amount of oil-containing drilling mud is produced. Directly discharging it will not only harm the environment, but also result in the oil in the drilling mud not being recycled, resulting in a waste of resources.

[0003] Thermal desorption technology is currently commonly used to treat drilling mud. This technology heats the mud to a high temperature, evaporating and separating the oil, which is then recycled. However, because this existing process requires heating, it is less safe and may pose a risk of explosion. Summary of the Invention

[0004] The present invention provides a treatment agent, method and equipment for treating drilling mud, which can be used to solve the technical problem of low safety in the current heating treatment method for drilling mud.

[0005] In a first aspect, an embodiment of the present application provides a treatment agent for treating drilling mud, the treatment agent comprising a viscosity reducer, a water purifier, hexane and ethyl acetate; the viscosity reducer, the water purifier, the hexane and the ethyl acetate are respectively calculated by mass percentage as follows: 1%-3% viscosity reducer, 1%-3% water purifier, 40%-50% hexane and 40%-50% ethyl acetate.

[0006] Alternatively, in one embodiment, the viscosity reducing agent includes an anionic surfactant and / or a nonionic surfactant.

[0007] Optionally, in one embodiment, the anionic surfactant includes at least one of carboxylates, sulfonates and polyoxyethylene fatty sulfates; the nonionic surfactant includes at least one of block polyethers with amines as initiators, block polyethers with alcohols as initiators, alkylphenol-formaldehyde resin block polyethers and phenolamine-formaldehyde resin block polyethers.

[0008] Optionally, in one embodiment, the water purifier includes at least one of polyaluminum chloride, polyaluminum ferric chloride, basic aluminum chloride, polyacrylamide, ferrous sulfate, aluminum sulfate and polyferric sulfate.

[0009] In a second aspect, the embodiments of the present application further provide a method for treating drilling mud using the treatment agent provided in the embodiments of the present application, the method comprising:

[0010] Mixing the treatment agent with drilling mud and stirring to obtain a first mixed material;

[0011] After stirring, the mixture is allowed to stand for a first preset time to obtain a first mixed liquid and a first sludge;

[0012] After the first preset time, the first mixed material is separated into layers, the upper layer is the first mixed liquid, and the lower layer is the first sludge. The first mixed liquid includes oil and the treatment agent.

[0013] Optionally, in one embodiment, after obtaining the first mixed solution, the method further comprises:

[0014] The oil product and the treatment agent in the first mixed liquid are separated under vacuum conditions, and the separated oil product and the treatment agent are recovered respectively.

[0015] Optionally, in one embodiment, after obtaining the first sludge, the method further comprises: transporting the first sludge to a filter press for processing.

[0016] Optionally, in one embodiment, the step of conveying the first sludge to a filter press for processing specifically includes:

[0017] adding water to the first sludge and mixing and stirring to obtain a second mixed material, and allowing the mixture to stand for a second preset time after stirring to obtain a second sludge; wherein after the second preset time, the second mixed material is separated into layers, and the lower layer is the second sludge;

[0018] The second sludge is transported to the filter press for processing.

[0019] In a third aspect, an embodiment of the present application further provides a device for treating drilling mud using the treatment agent provided in an embodiment of the present application, the device comprising: a stirring mixing tank, a vacuum separation device, and a filter press;

[0020] Wherein, the stirring and mixing tank has a first outlet and a second outlet, the vacuum separation device has an inlet, and the filter press has an inlet;

[0021] The first outlet of the stirring and mixing tank is communicated with the inlet of the vacuum separation device, and the second outlet of the stirring and mixing tank is communicated with the inlet of the filter press.

[0022] Optionally, in one embodiment, the vacuum separation device includes a membrane separator and a vacuum unit;

[0023] The membrane separator is connected to the vacuum unit, and the membrane separator has an inlet;

[0024] The first outlet of the stirring mixing tank is communicated with the inlet of the membrane separator.

[0025] The beneficial effects brought about by the present invention are as follows:

[0026] The treating agent provided in an embodiment of the present application is used to treat drilling mud, and the treating agent includes a viscosity reducer, a water purifier, hexane, and ethyl acetate; the viscosity reducer, the water purifier, the hexane, and the ethyl acetate are respectively calculated in mass percentages as follows: 1%-3% viscosity reducer, 1%-3% water purifier, 40%-50% hexane, and 40%-50% ethyl acetate; by utilizing the electrical interaction between polar molecules and the transfer effect between non-polar molecules, the oil in the drilling mud can be separated at room temperature, avoiding the step of separating the oil at high temperature, thereby improving the safety of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without inventive work. In the drawings:

[0028] Figure 1 A schematic flow chart of a method for treating drilling mud provided in an embodiment of the present application;

[0029] Figure 2 A schematic flow chart of another method for treating drilling mud provided in an embodiment of the present application;

[0030] Figure 3 A schematic flow chart of another method for treating drilling mud provided in an embodiment of the present application;

[0031] Figure 4 A schematic flow chart of another method for treating drilling mud provided in an embodiment of the present application;

[0032] Figure 5 A schematic flow chart of another method for treating drilling mud provided in an embodiment of the present application;

[0033] Figure 6 A schematic structural diagram of an apparatus for processing drilling mud provided in an embodiment of the present application;

[0034] Figure 7 A schematic structural diagram of another device for processing drilling mud provided in an embodiment of the present application;

[0035] Figure 8 A schematic structural diagram of another device for processing drilling mud provided in an embodiment of the present application;

[0036] Figure 9 A schematic structural diagram of another device for processing drilling mud provided in an embodiment of the present application;

[0037] Figure 10 A schematic structural diagram of another device for processing drilling mud provided in an embodiment of the present application;

[0038] Figure 11 A schematic structural diagram of another device for processing drilling mud provided in an embodiment of the present application;

[0039] Figure 12 A schematic structural diagram of another device for processing drilling mud provided in an embodiment of the present application;

[0040] Figure 13 A schematic structural diagram of another device for processing drilling mud provided in an embodiment of the present application;

[0041] Figure 14 A schematic structural diagram of another device for processing drilling mud provided in an embodiment of the present application;

[0042] Figure 15 A schematic structural diagram of another device for processing drilling mud provided in an embodiment of the present application.

[0043] Reference numerals:

[0044] 30—Drilling mud processing equipment; 301—Stirring and mixing tank; 302—Vacuum separation device; 303—Filter press; 304—Mixed liquid storage tank; 305—Treatment agent recovery device; 3051—First condenser; 3052—Treatment agent storage tank; 3053—Second condenser; 3054—Third condenser; 306—Oil product storage tank; 307—First water storage tank; 308—Sludge disposal tank; 309—First chemical storage tank; 310—Second chemical storage tank.

[0045] 40—Drilling mud treatment equipment; 401—First chemical storage tank; 402—Stirring and mixing tank; 403—Mixed liquid storage tank; 404—Membrane separator; 405—Cold trap; 406—Oil product storage tank; 407—Treatment agent storage tank; 408—First water storage tank; 409—Second chemical storage tank; 410—Sludge disposal tank; 411—Filter press; 412—Second water storage tank. DETAILED DESCRIPTION

[0046] To make the purpose, technical solutions, and advantages of this application more clear, the technical solutions of this application will be clearly and completely described below in conjunction with the specific embodiments of this application and the corresponding drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0047] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly refer to one or more of the features. Throughout the description of this application, unless otherwise specified, "plurality" means two or more. Furthermore, "and / or" in the specification and claims refers to at least one of the connected entities, and the character " / " generally indicates an "or" relationship between the connected entities.

[0048] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0049] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0050] As described in the background of this application, thermal desorption technology is currently commonly used to treat drilling mud. The process involves heating the drilling mud to 500°C to 800°C using heating equipment to evaporate and separate the oil in the mud, and then recycling the separated oil. However, because the drilling mud is treated under heated conditions, the process is less safe and may pose a risk of explosion. This treatment method also places high demands on the equipment, such as the need to withstand high temperatures and pressures. Furthermore, the process consumes a lot of energy.

[0051] To this end, an embodiment of the present application provides a treatment agent for treating drilling mud, which includes a viscosity reducer, a water purifier, hexane and ethyl acetate; the viscosity reducer, the water purifier, the hexane and the ethyl acetate are respectively calculated by mass percentage as follows: 1%-3% viscosity reducer, 1%-3% water purifier, 40%-50% hexane and 40%-50% ethyl acetate.

[0052] The treating agent can separate organic matter such as oil from the drilling mud when mixed with the drilling mud and dissolve it in the treating agent to form a mixed solution comprising the oil and the treating agent. The mixed solution can then be further treated to separate the oil from the mixed solution, thereby achieving the recovery and utilization of the oil in the drilling mud. The organic matter may also include calcium stearate and Tween.

[0053] Viscosity reducers can first be used to reduce the viscosity of drilling mud, thereby facilitating the separation of oil products from the drilling mud. Second, viscosity reducers can be used to reduce the viscosity of a mixture comprising oil products and treatment agents, facilitating the subsequent separation of the oil products from the treatment agents for oil product recovery. The viscosity reducer can include anionic surfactants and / or nonionic surfactants. The anionic surfactants include at least one of carboxylates, sulfonates, and polyoxyethylene fatty sulfates. It should be understood that when the anionic surfactant includes only one of carboxylates, sulfonates, and polyoxyethylene fatty sulfates, it can also be a mixture, for example, the anionic surfactant can be a mixture of two or more carboxylates. The nonionic surfactant includes at least one of a block polyether with amines as an initiator, a block polyether with alcohols as an initiator, an alkylphenol-formaldehyde resin block polyether, and a phenolamine-formaldehyde resin block polyether. It should be understood that when the nonionic surfactant only includes one of the block polyether with amines as an initiator, the block polyether with alcohols as an initiator, the alkylphenol-formaldehyde resin block polyether, and the phenolamine-formaldehyde resin block polyether, it can still be a mixture. For example, the nonionic surfactant can be a mixture of two or more block polyethers with amines as an initiator. When the viscosity reducer includes a combination of multiple drugs, the drugs can be selected according to the synergistic effect to avoid the occurrence of antagonistic effects.

[0054] Drilling mud may contain some water. The water purifier can react with impurities in the water to remove them, reducing the impurities in the mixed liquid and thereby improving the purity of the oil product subsequently separated from the mixed liquid. The mixed liquid is formed by dissolving the oil product in the drilling mud in the treatment agent, forming a mixture of the oil product and the treatment agent. The water purifier can include at least one of polyaluminum chloride, polyaluminum ferric chloride, basic aluminum chloride, polyacrylamide, ferrous sulfate, aluminum sulfate, and polyferric sulfate.

[0055] First, the hexane and ethyl acetate can utilize the electrical interaction between polar molecules and the transfer effect between non-polar molecules to dissolve the treatment agent and organic matter such as oil products in the drilling mud at room temperature, thereby quickly separating the oil products and other organic matter from the drilling mud. Second, the hexane and ethyl acetate have the characteristics of low toxicity and low boiling point, which not only improves operational safety but also facilitates the subsequent separation of the treatment agent and oil products (see the relevant description below for details).

[0056] It can be understood that the treatment agent for treating drilling mud provided in the embodiments of the present application utilizes the electrical interaction between polar molecules and the transfer effect between non-polar molecules to separate the oil products in the drilling mud at room temperature, avoiding the step of separating the oil products at high temperature, thereby improving the safety of the operation. In addition, since the oil products can be separated at room temperature, the equipment requirements are not high, saving the investment cost of the equipment and effectively reducing energy consumption. On the other hand, after testing, the oil content in the mud residue remaining after the oil products are separated is also low. It can be seen that the treatment of drilling mud with the treatment agent provided in the embodiments of the present application can effectively remove the oil products therein.

[0057] Based on the treatment agent for treating drilling mud provided in the embodiment of the present application, the embodiment of the present application also provides a method for treating drilling mud using the treatment agent provided in the embodiment of the present application, such as Figure 1 As shown, the method includes the following steps:

[0058] Step 101: Mixing a treatment agent with drilling mud to obtain a first mixed material.

[0059] The mass ratio of drilling mud to treatment agent may be 1:0.8 to 1:1.2.

[0060] During the stirring process, the oil in the drilling mud can be separated and dissolved in the treatment agent at room temperature. The stirring time can be set according to actual needs, for example, 1 hour. The speed of the agitator that stirs the treatment agent and drilling mud can also be set according to actual needs, for example, 60 rpm.

[0061] Step 102: After stirring, the mixture is allowed to stand for a first preset time to obtain a first mixed liquid and a first sludge.

[0062] After stirring, the first mixed material is allowed to rest for a first preset period of time to allow the first mixed material to separate into layers. During this resting period, due to density differences, the first mixed liquid containing the oil and the treatment agent floats on the upper layer, while the first sludge, free of the oil, resides on the lower layer. The first preset period of time can be set based on actual needs, for example, 2 hours.

[0063] Since the water purifier contained in the treatment agent reacts with impurities to remove impurities, it is generally removed by a flocculation reaction with the impurities, that is, the water purifier reacts with the impurities to produce a flocculated precipitate. Then, during the static stratification process, the flocculated precipitate will settle and become part of the lower layer of sludge. As a result, there are fewer impurities in the upper first mixed liquid, which can effectively avoid the influence of impurities on the subsequent oil separation treatment process and can improve the purity of the oil separated from the mixed liquid later.

[0064] It is understood that the drilling mud treatment method provided in the embodiments of the present application can separate the oil products from the drilling mud at room temperature, avoiding the step of high-temperature oil separation, thereby improving operational safety. Furthermore, since the oil products can be separated at room temperature, the equipment requirements are not high, saving equipment investment costs and effectively reducing energy consumption. Furthermore, testing has shown that the oil content of the mud residue remaining after the oil products are separated is also low. This shows that treating the drilling mud with the treatment agent provided in the embodiments of the present application can effectively remove the oil products therein.

[0065] In order to further recover the oil product, in one embodiment, after obtaining the first mixed liquid, Figure 2 As shown, the method further includes step 103: separating the oil product and the treatment agent in the first mixed liquid under vacuum conditions, and recovering the separated oil product and treatment agent respectively.

[0066] Among them, since the treatment agent provided in the embodiment of the present application is mainly composed of low-boiling-point hexane and the ethyl acetate, the boiling point of the treatment agent is low and it is very easy to boil and vaporize under vacuum conditions; the oil product in the first mixed liquid is generally a heavy oil component with a high boiling point, which is not easy to boil and vaporize under vacuum conditions and still maintains a liquid phase. Based on this principle, the oil product and the treatment agent in the first mixed liquid can be separated.

[0067] The vacuum condition can specifically be a condition of a vacuum pressure of -0.09Mpa. Under this vacuum condition, the boiling point of the treatment agent provided in the embodiment of the present application is below 10°C, while the boiling point of the oil product is between 70°C and 80°C. Therefore, after the first mixed liquid at room temperature is transferred to the above-mentioned vacuum condition, the oil product and the treatment agent in the first mixed liquid are separated under the vacuum condition, specifically including: the temperature of the treatment agent in the first mixed liquid is higher than its boiling point, and then it is vaporized into gas, and the temperature of the oil product in the first mixed liquid is lower than its boiling point, and it still remains in liquid state, and the gas-liquid two-phase separation realizes the separation of the oil product and the treatment agent in the first mixed liquid.

[0068] Furthermore, the separated oil product and treatment agent are recovered separately. Specifically, the gas obtained by vaporizing the treatment agent is discharged from the gas outlet of the device providing vacuum conditions for recovery, and the liquid oil product is discharged from the second outlet of the device providing vacuum conditions for recovery.

[0069] It can be understood that through the above scheme, based on the huge difference in boiling point between the treatment agent and the oil product under vacuum conditions, the oil product and the treatment agent can be separated, and then the oil product and the treatment agent can be recovered separately, thereby realizing the recycling of the oil product and the treatment agent, and at the same time, the step of high-temperature separation of the oil product can be avoided, thereby improving the safety of the operation.

[0070] In practical applications, after the first mixed material is allowed to stand and separate, the upper layer is the first mixed liquid including the oil product and the treatment agent, and the lower layer is the sludge after the oil product is removed. For the convenience of description, the sludge is referred to as the first sludge. In order to facilitate the subsequent use of the first sludge, in one embodiment, Figure 3 As shown, the method for treating drilling mud provided by the embodiment of the present application further includes step 104: transporting the first mud residue to a filter press for treatment.

[0071] In step 104, the first sludge is transported to a filter press for processing. In practice, the upper layer of the first mixed liquid may be first drained and transferred to a device providing vacuum conditions, and then the lower layer of the first sludge is drained and transported to the filter press for processing. Transporting the first sludge to the filter press for processing can dehydrate the first sludge, thereby reducing its volume. The filter press may be a plate and frame filter press.

[0072] It can be understood that, through the above solution, the first sludge is transported to the filter press for processing, which can achieve the reduction of the first sludge, thereby facilitating the transportation and subsequent resource utilization of the first sludge.

[0073] Considering that some oil products still remain in the lower first sludge and are mixed with some treatment agents, in order to further remove the oil products, in one embodiment, as Figure 4 As shown, step 104 transports the first sludge to a filter press for processing, which specifically includes:

[0074] Step 1041 , adding water to the first sludge and mixing and stirring to obtain a second mixed material, and then letting it stand for a second preset time after stirring to obtain a second sludge.

[0075] In the specific implementation of step 1041, the upper first mixed liquid is first discharged and transferred to a device providing vacuum conditions, and then water is directly added to the first sludge without discharging the lower first sludge.

[0076] Water is added to the first sludge and mixed and stirred to wash the first sludge again, so that the oil remaining in the first sludge can continue to dissolve in the treatment agent remaining in the first sludge at room temperature. The stirring time can be set according to actual needs, for example, stirring for 1 hour.

[0077] After standing for the second preset time, the second mixture separates into layers: an upper layer consisting of the second mixed liquid containing the oil and treatment agent, a middle layer consisting of water, and a lower layer consisting of a second sludge. Compared to the first sludge, the second sludge contains less residual oil and treatment agent. Testing shows that the oil content in the second sludge is ≤ 1%, indicating that the treatment in step 1041 further effectively removes the oil from the sludge. The second preset time can be set as needed, for example, to 2 hours.

[0078] Step 1042: transport the second sludge to a filter press for processing.

[0079] Step 1042 transports the second sludge to a filter press for processing. In specific implementation, the upper second mixed liquid and the middle water can be drained out first, and then the lower second sludge is drained out and transported to the filter press for processing. After testing, the oil content in the second sludge treated in step 1042 is ≤0.3%, which shows that the oil in the sludge has been further removed. In addition, the second mixed liquid can be further transferred to vacuum conditions to achieve the recovery of oil and treatment agent. For details, please refer to the treatment process of the first mixed liquid, which will not be repeated here. After the middle water is drained out, it can be recycled, for example, it can be used to wash the first sludge produced in the next batch.

[0080] It can be understood that, through the above solution, water is added to the first sludge for washing, so that the residual oil in the first sludge can continue to dissolve in the residual treatment agent in the first sludge, thereby further removing the residual oil and treatment agent in the first sludge.

[0081] In order to further reduce the impact of sludge discharge on the environment and improve the reduction treatment effect, in one embodiment, after obtaining the second sludge in step 1041 and before transporting the second sludge to the filter press for treatment in step 1042, the drilling mud treatment method provided in the embodiment of the present application also includes: adding an oxidant and a flocculant to the second sludge.

[0082] The oxidant can be used to kill various biological pathogens in the second sludge, thereby preventing the sludge from polluting the environment after discharge. The flocculant can make the substances in the second sludge more aggregated, which is beneficial for the filter press to dehydrate the second sludge.

[0083] It can be understood that, through the above solution, by adding an oxidant and a flocculant to the second sludge, it is possible to avoid environmental pollution after the sludge is discharged, and at the same time, the reduction treatment effect can be improved.

[0084] Based on the method for treating drilling mud provided in the above embodiment of the present application, the embodiment of the present application also provides a more specific method for treating drilling mud. It should be understood that this method is only an example and does not limit the method for treating drilling mud provided in the embodiment of the present application. Figure 5 As shown, the method includes:

[0085] Step 201: Mix the treatment agent and drilling mud to obtain a first mixed material.

[0086] The treatment agent is the treatment agent for treating drilling mud provided in the above-mentioned embodiments of this application. The mass ratio of drilling mud to treatment agent is 1:0.8 to 1:1.2. During the stirring process, the oil in the drilling mud can be separated and dissolved in the treatment agent at room temperature. The stirring time is 1 hour, and the speed of the stirrer stirring the treatment agent and drilling mud is 60 rpm.

[0087] Step 202: After stirring, the mixture is allowed to stand for a first preset time to obtain a first mixed liquid and a first sludge.

[0088] During the standing process, due to the difference in density, the first mixed liquid containing the oil and the treatment agent floats on the upper layer, while the first sludge without the oil is located in the lower layer.

[0089] Step 203 : Separate the oil product and the treatment agent in the first mixed liquid under vacuum conditions, and recover the separated oil product and treatment agent respectively.

[0090] The vacuum condition is a vacuum pressure of -0.09 MPa. Under this vacuum condition, the boiling point of the treatment agent provided in the embodiments of the present application is below 10°C, while the boiling point of the oil product is between 70°C and 80°C. After the first mixed liquid at room temperature is transferred to the above vacuum conditions, the treatment agent in the first mixed liquid vaporizes into a gas, while the oil product in the first mixed liquid remains in a liquid state.

[0091] Furthermore, the gas obtained by gasifying the treatment agent is discharged from the gas outlet of the device providing the above-mentioned vacuum condition, and the liquid oil product is discharged from the second outlet of the device providing the above-mentioned vacuum condition.

[0092] Step 204 , adding water to the first sludge and mixing and stirring to obtain a second mixed material, and letting it stand for a second preset time after stirring to obtain a second mixed liquid and a second sludge.

[0093] The upper first mixed liquid is firstly discharged and transferred to a device providing vacuum conditions, and then water is added to the first sludge. During the stirring process, the oil remaining in the first sludge continues to dissolve in the treatment agent remaining in the first sludge.

[0094] After standing, the second mixed material is separated into layers, the upper layer is the second mixed liquid containing oil and treatment agent, the middle layer is the water layer, and the lower layer is the second sludge.

[0095] Step 205 , separating the oil product and the treatment agent in the second mixed liquid under vacuum conditions, and recovering the separated oil product and treatment agent respectively.

[0096] The upper second mixed liquid is drained out and transferred to vacuum conditions to achieve the recovery of oil and treatment agent. For details, please refer to the treatment process of the first mixed liquid and will not be repeated here. The water in the middle layer is drained out for recycling.

[0097] Step 206: adding an oxidant and a flocculant to the second sludge.

[0098] Oxidants and flocculants are added to the second sludge to kill various biological pathogens in the second sludge, thereby avoiding pollution to the environment after the second sludge is discharged, and making the substances in the second sludge more aggregated, which is convenient for reduction treatment.

[0099] Step 207: transport the second sludge to a filter press for processing.

[0100] The second sludge is transported to the filter press for processing, which can dehydrate the second sludge and achieve the reduction of the first sludge, making it easier for subsequent transportation and resource utilization.

[0101] It is understood that the drilling mud treatment method provided in the embodiments of the present application can separate the oil products from the drilling mud at room temperature, avoiding the step of high-temperature oil separation, thereby improving operational safety. Furthermore, since the oil products can be separated at room temperature, the equipment requirements are not high, saving equipment investment costs and effectively reducing energy consumption. Furthermore, testing has shown that the oil content of the mud residue remaining after the oil products are separated is also low. This shows that treating the drilling mud with the treatment agent provided in the embodiments of the present application can effectively remove the oil products therein.

[0102] Based on the treatment agent for treating drilling mud provided in the embodiment of the present application, the embodiment of the present application also provides a device 30 for treating drilling mud using the treatment agent provided in the embodiment of the present application. The device 30 can treat drilling mud under normal temperature conditions. Figure 6As shown, the drilling mud processing equipment 30 includes: a stirring and mixing tank 301, a vacuum separation device 302 and a filter press 303; the stirring and mixing tank 301 has a first outlet and a second outlet, the vacuum separation device 302 has an inlet, and the filter press 303 has an inlet; the first outlet of the stirring and mixing tank 301 is connected to the inlet of the vacuum separation device 302, and the second outlet of the stirring and mixing tank 301 is connected to the inlet of the filter press 303.

[0103] The mixing tank 301 may also have a first inlet and a second inlet. The first inlet may be used to input drilling mud A into the mixing tank 301, and the second inlet may be used to input treatment agent B into the mixing tank 301. The mixing tank 301 can be used to mix the input drilling mud and treatment agent and provide a space for the mixed materials to rest. During the mixing process, the oil in the drilling mud separates and dissolves in the treatment agent. During the resting process, due to the difference in density, the first mixed liquid containing the oil and treatment agent floats on the top layer, while the first mud residue without the oil is located at the bottom layer.

[0104] The first outlet of the stirring and mixing tank 301 can be used to guide the first mixed liquid in the upper layer and transport it to the vacuum separation device 302. The second outlet of the stirring and mixing tank 301 can be used to guide the first sludge in the lower layer and transport it to the filter press 303.

[0105] The mixing tank 301 may also be provided with an observation mirror to facilitate the operator to observe the mixing state and static stratification of the materials. Furthermore, the mixing tank 301 may also be provided with a vent valve to discharge the light petroleum gas components to prevent the light petroleum gas components from continuously accumulating in the mixing tank 301 and reaching the explosion limit.

[0106] A floating oil collector can also be installed in the mixing tank 301. The floating oil collector consists of an interface meter and a telescopic pipeline. This floating oil collector can prevent the lower layer of mud from being transported to the vacuum separation device 302. The interface meter floats on the surface of the mixed liquid. When the interface meter detects the interface between air and the mixed liquid, material can be continuously transported to the vacuum separation device 302, and the mixed liquid is transported. When the interface meter detects the oil-water interface (the water interface is the interface of the lower layer of mud), the material supply to the vacuum separation device 302 can be stopped, thereby preventing the lower layer of mud from being transported to the vacuum separation device 302.

[0107] The vacuum separation device 302 can be used to provide a vacuum environment for the first mixed liquid. Under vacuum conditions, the temperature of the treatment agent in the first mixed liquid is higher than its boiling point, causing it to vaporize into a gas. The temperature of the oil product in the first mixed liquid is lower than its boiling point, causing it to remain in a liquid state, thereby achieving separation of the treatment agent and the oil product.

[0108] To improve the separation of the treatment agent from the oil product, in one embodiment, the vacuum separation device 302 includes a membrane separator and a vacuum unit. The membrane separator is connected to the vacuum unit. The membrane separator has an inlet, and the first outlet of the stirring mixing tank 301 is connected to the inlet of the membrane separator. The vacuum unit is used to provide a vacuum environment for the membrane separator. The membrane separator is provided with a rotary distributor. After the first mixed liquid enters the membrane separator, it is dispersed by the rotary distributor to form a continuous and uniform liquid film, thereby allowing the low-boiling-point treatment agent to quickly vaporize into gas and quickly separate from the oil product. The membrane separator also has a reducer and a rotor. The rotor is connected to the rotary distributor. The reducer provides power to the rotor, and the rotation of the rotor drives the rotary distributor.

[0109] When the vacuum separation device 302 includes a membrane separator and a vacuum unit, the apparatus 30 for treating drilling mud provided in this embodiment of the present application may further include a filter, and the first outlet of the mixing tank 301 is connected to the inlet of the membrane separator through the filter. The filter can be used to filter out large impurities in the mixed liquid, thereby preventing large impurities from coking and clogging the membrane separator.

[0110] The filter press 303 can be used to perform filter press treatment on the first sludge to achieve sludge reduction treatment.

[0111] It will be appreciated that the apparatus 30 for treating drilling mud provided in the embodiments of the present application does not include a heating device and can process the drilling mud and remove oil products therefrom at room temperature, thereby improving the safety of the drilling mud treatment process. Furthermore, the absence of a heating device in the apparatus 30 also reduces the investment cost of the equipment.

[0112] In order to ensure the continuity of the first mixed liquid treatment process, in one embodiment, the device 30 for treating drilling mud provided in the embodiment of the present application further includes a mixed liquid storage tank 304, such as Figure 7 As shown, the mixed liquid storage tank 304 has an inlet and an outlet, the first outlet of the stirring mixing tank 301 is connected to the inlet of the mixed liquid storage tank 304 , and the outlet of the mixed liquid storage tank 304 is connected to the inlet of the vacuum separation device 302 .

[0113] The mixed solution storage tank 304 can be used to temporarily store the first mixed solution (and can also be used to temporarily store the second mixed solution).

[0114] Because the drilling mud is processed in mixing tank 301 in an intermittent manner, directly connecting mixing tank 301 to vacuum separation device 302 would not ensure the continuous flow of the first mixed liquid into vacuum separation device 302, thereby interrupting the first mixed liquid processing process. By providing mixed liquid storage tank 304, after a certain amount of the first mixed liquid is temporarily stored in mixed liquid storage tank 304, the first mixed liquid is then passed into vacuum separation device 302. A certain amount of the first mixed liquid is always present in mixed liquid storage tank 304, thereby ensuring the continuity of the first mixed liquid processing process.

[0115] The mixed liquid storage tank 304 may also be provided with an observation mirror and a liquid level gauge to facilitate the operator to observe the remaining material. Furthermore, the mixed liquid storage tank 304 may also be provided with a bleed valve to discharge the light petroleum gas component to prevent the light petroleum gas component from continuously accumulating in the mixed liquid storage tank 304 and reaching the explosion limit.

[0116] It can be understood that, through the above solution, the mixed liquid storage tank 304 is provided between the stirring mixing tank 301 and the vacuum separation device 302 for temporarily storing the first mixed liquid, which can ensure the continuity of the first mixed liquid treatment process.

[0117] In order to further realize the recycling of treatment agents and oil products, in one embodiment, the device 30 for treating drilling mud provided in the embodiment of the present application further includes a treatment agent recovery device 305 and an oil storage tank 306, wherein the treatment agent recovery device 305 has an inlet, the oil storage tank 306 has an inlet, and the vacuum separation device 302 further has a first outlet and a second outlet; the first outlet of the vacuum separation device 302 is communicated with the inlet of the treatment agent recovery device 305, and the second outlet of the vacuum separation device 302 is communicated with the inlet of the oil storage tank 306, as shown in FIG. Figure 8 shown.

[0118] The first outlet of the vacuum separation device 302 can be used to discharge the gasified treatment agent, and the second outlet of the vacuum separation device 302 can be used to discharge the oil remaining after the treatment agent is separated.

[0119] The treatment agent recovery device 305 can be used to recover the vaporized treatment agent. The oil product storage tank 306 can be used to recover and store the oil product after the treatment agent is separated in the vacuum separation device 302. The oil product storage tank 306 can also be equipped with an observation mirror and a bleed valve to facilitate operator observation and discharge of light petroleum gas components to prevent continued accumulation of light petroleum gas components to reach the explosion limit.

[0120] It can be understood that through the above solution, the treatment agent recovery device 305 and the oil storage tank 306 are set and connected to the first outlet and the second outlet of the vacuum separation device 302 respectively, so that the treatment agent and the oil can be recovered respectively for subsequent use.

[0121] In order to achieve rapid recovery of the treatment agent, in one embodiment, as Figure 9 As shown, the treatment agent recovery device 305 includes a first condenser 3051 and a treatment agent storage tank 3052, the first condenser 3051 has an inlet and an outlet, the treatment agent storage tank 3052 has an inlet, the first outlet of the vacuum separation device 302 is connected to the inlet of the first condenser 3051, and the outlet of the first condenser 3051 is connected to the inlet of the treatment agent storage tank 3052.

[0122] Wherein, the first condenser 3051 can be used for condensing the treatment agent after gasification to obtain liquid treatment agent. Treatment agent storage tank 3052 can be used for collecting and storing liquid treatment agent, is convenient to subsequent recycling, for example, is circulated for processing drilling mud. The treatment agent that treatment agent storage tank 3052 collects obtains generally has loss, and before treatment agent is circulated for processing drilling mud, can first in treatment agent, supplement a certain amount of viscosity reducer, water purifier, hexane and ethyl acetate. Treatment agent storage tank 3052 can also be provided with observation mirror and bleed valve, is convenient for operator to observe, and discharges light petroleum gas component, avoids light petroleum gas component to continue to gather and arrive explosion limit.

[0123] Specifically, the first condenser 3051 may include a cold trap and a refrigerator, which are connected. The first outlet of the vacuum separation device 302 is connected to the inlet of the cold trap, and the outlet of the cold trap is connected to the inlet of the treatment agent storage tank 3052. The refrigerator provides a cold source for the cold trap. The cold trap may be further connected to a vacuum unit. The temperature inside the cold trap can be as low as -40°C, allowing the treatment agent gas to condense instantly.

[0124] It can be understood that, through the above solution, the treatment agent recovery device 305 includes the first condenser 3051 and the treatment agent storage tank 3052, and recovers the treatment agent by condensation, which can quickly recover the treatment agent and improve the recovery efficiency.

[0125] In practical applications, if the amount of gas obtained by gasification of the treatment agent in the vacuum separation device 302 is large and is input into the first condenser 3051, it may lead to poor condensation effect, thereby affecting the recovery efficiency of the treatment agent. Figure 10As shown, the treatment agent recovery device 305 also includes a second condenser 3053, the second condenser 3053 has an inlet and an outlet, the first condenser 3051 has a first outlet and a second outlet, the first outlet of the first condenser 3051 is connected to the inlet of the second condenser 3053, the second outlet of the first condenser 3051 is connected to the inlet of the treatment agent storage tank 3052, and the outlet of the second condenser 3053 is connected to the inlet of the treatment agent storage tank 3052.

[0126] The first outlet of the first condenser 3051 is connected to the inlet of the second condenser 3053. It can be understood that the first condenser 3051 and the second condenser 3053 are arranged in series. When the first condenser 3051 and the second condenser 3053 both include cold traps, the series connection of the first condenser 3051 and the second condenser 3053 can specifically be the series connection of two cold traps. The two cold traps can be connected to the same refrigerator and share the same refrigerator, or they can be connected to different refrigerators.

[0127] It can be understood that through the above scheme, a second condenser 3053 is added to the treatment agent recovery device 305, and the first condenser 3051 and the second condenser 3053 are arranged in series, so that when the amount of gas obtained by vaporization of the treatment agent is large, the treatment agent gas that cannot be cooled by the first condenser 3051 can continue to be condensed in the second condenser 3053.

[0128] Or, in another embodiment, Figure 11 As shown, the treatment agent recovery device 305 also includes a third condenser 3054, which has an inlet and an outlet. The inlet of the first condenser 3051 and the inlet of the third condenser 3054 are both connected to the first outlet of the vacuum separation device 302, and the outlet of the first condenser 3051 and the outlet of the third condenser 3054 are both connected to the inlet of the treatment agent storage tank 3052.

[0129] The inlet of the first condenser 3051 and the inlet of the third condenser 3054 are both connected to the first outlet of the vacuum separation device 302. It can be understood that the first condenser 3051 and the third condenser 3054 are arranged in parallel. When the first condenser 3051 and the third condenser 3054 both include cold traps, the parallel connection of the first condenser 3051 and the third condenser 3054 can specifically be the parallel connection of two cold traps. The two cold traps can be connected to the same refrigerator and share the same refrigerator, or they can be connected to different refrigerators.

[0130] It can be understood that through the above scheme, a third condenser 3054 is added to the treatment agent recovery device 305, and the first condenser 3051 and the third condenser 3054 are arranged in parallel, so that when the amount of gas obtained by vaporizing the treatment agent is large, a part of the treatment agent gas can be transported to the third condenser 3054 for condensation, thereby improving the recovery efficiency.

[0131] Taking into account that some oil products still remain in the lower first mud and are mixed with some treatment agents, in order to further achieve the removal of said part of oil products and said part of treatment agents, in the method for treating drilling mud provided in the above embodiment of the present application, water is added to the first mud to wash the first mud again, so that the oil products remaining in the first mud can continue to dissolve in the treatment agent remaining in the first mud. Therefore, in one embodiment, the stirring and mixing tank 301 also has a third inlet and a third outlet, and the equipment 30 for treating drilling mud provided in the embodiment of the present application also includes a first water storage tank 307, the first water storage tank 307 has an inlet and an outlet, the third outlet of the stirring and mixing tank 301 is connected to the inlet of the first water storage tank 307, and the outlet of the first water storage tank 307 is connected to the third inlet of the stirring and mixing tank 301, as shown in FIG. Figure 12 shown.

[0132] The third inlet of the stirring and mixing tank 301 can input water C, and the input water can be water recovered from the first water storage tank 307 and / or water introduced from the outside.

[0133] After the first sludge is stirred, washed and allowed to stand with water, the upper layer is a second mixed liquid containing oil and treatment agent, the middle layer is a water layer, and the lower layer is the second sludge. After the second mixed liquid in the upper layer is discharged, the water in the middle layer can be output through the third outlet of the stirring mixing tank 301 and transported to the first water storage tank 307 for recovery.

[0134] The outlet of the first water storage tank 307 is connected to the third inlet of the stirring and mixing tank 301, so that the water recovered from the first water storage tank 307 can be reused to wash the first sludge generated in the next batch.

[0135] It can be understood that through the above scheme, the stirring and mixing tank 301 also has a third outlet and a third inlet. The third outlet of the stirring and mixing tank 301 is connected to the inlet of the first water storage tank 307, and the outlet of the first water storage tank 307 is connected to the third inlet of the stirring and mixing tank 301, so that the first sludge can be washed to further remove the oil and treatment agent in the sludge, and the washing water can also be recycled.

[0136] In order to ensure the continuity of the mud treatment process, in one embodiment, the equipment 30 for treating drilling mud provided in the embodiment of the present application further includes a mud treatment tank 308, wherein the mud treatment tank 308 has an inlet and an outlet, the second outlet of the mixing tank 301 is connected to the inlet of the mud treatment tank 308, and the outlet of the mud treatment tank 308 is connected to the inlet of the filter press 303. Figure 13 shown.

[0137] The sludge disposal tank 308 can be used to temporarily store sludge discharged from the mixing tank 301. Because the mixing tank 301 processes drilling mud in an intermittent manner, directly connecting the mixing tank 301 to the filter press 303 would not ensure continuous sludge flow into the filter press 303, leading to interruptions in the sludge treatment process. After temporarily storing a certain amount of sludge in the sludge disposal tank 308, the sludge is then passed into the filter press 303. This ensures that there is always a certain amount of sludge remaining in the sludge disposal tank 308, thereby ensuring the continuity of the sludge treatment process in the filter press 303.

[0138] The sludge disposal tank 308 may also be provided with an observation mirror and a vent valve to facilitate observation by the operator and to discharge the light petroleum gas components to prevent the light petroleum gas components from continuously accumulating and reaching the explosion limit.

[0139] It can be understood that, through the above solution, a sludge disposal tank 308 is provided between the stirring and mixing tank 301 and the filter press 303 for temporarily storing sludge, which can ensure the continuity of the sludge treatment process.

[0140] On the other hand, to reduce the environmental impact of sludge discharge and improve the reduction effect, the method for treating drilling mud provided in the above-mentioned embodiment of this application adds an oxidant and a flocculant to the sludge. Sludge disposal tank 308 can then also serve as a reaction vessel for the sludge, oxidant, and flocculant. After the reaction, the sludge is transported to filter press 303. In practical applications, to enhance the reaction effect of the sludge, oxidant, and flocculant, an agitator can be installed inside sludge disposal tank 308 to accelerate the reaction through stirring.

[0141] Furthermore, the apparatus 30 for treating drilling mud provided in the embodiment of the present application may further include a first chemical storage tank 309 and a second chemical storage tank 310, the sludge disposal tank 308 having a first inlet and a second inlet, the outlet of the first chemical storage tank 309 being communicated with the second inlet of the stirring and mixing tank 301, the second outlet of the stirring and mixing tank 301 being communicated with the first inlet of the sludge disposal tank 308, the outlet of the second chemical storage tank 310 being communicated with the second inlet of the sludge disposal tank 308, as shown in FIG. Figure 14 shown.

[0142] The first reagent storage tank 309 can be used to store and prepare treatment agents, and the second reagent storage tank 310 can be used to store and prepare agents for treating sludge, such as oxidants and flocculants.

[0143] It can be understood that through the above scheme, the first reagent storage tank 309 and the second reagent storage tank 310 are set up and connected to the stirring and mixing tank 301 and the sludge disposal tank 308 respectively, which can facilitate the input of treatment reagents into the stirring and mixing tank 301 and the sludge disposal tank 308.

[0144] In addition, to facilitate material transportation and monitoring, the processing equipment 30 may be equipped with various pumps and monitoring instruments. For example, a Roots pump may be provided to transport drilling mud into the mixing tank 301, a mud pump may be provided to transport mud residue from the mixing tank 301 into the mud residue disposal tank 308, and flow meters and pressure gauges may be provided on the conveying pipelines. Furthermore, to further enhance the safety of the processing process, each device in the processing equipment 30 may utilize explosion-proof devices.

[0145] Based on the device 30 for processing drilling mud provided in the above embodiment of the present application, the embodiment of the present application further provides a more specific device 40 for processing drilling mud. It should be understood that the device 40 is only an example and does not limit the device for processing drilling mud provided in the embodiment of the present application. Figure 15As shown, the equipment 40 includes: a first reagent storage tank 401, a stirring and mixing tank 402, a mixed liquid storage tank 403, a membrane separator 404, a vacuum unit, a cold trap 405, a refrigerator, an oil storage tank 406, a treatment agent storage tank 407, a first water storage tank 408, a second reagent storage tank 409, a sludge disposal tank 410, a filter press 411 and a second water storage tank 412; the stirring and mixing tank 402 has a first inlet, a second inlet, a third inlet, a first outlet, a second outlet and a third outlet, the membrane separator 40 4 has a first outlet and a second outlet, the sludge disposal tank 410 has a first inlet and a second inlet, and the filter press 411 has a first outlet and a second outlet; the first inlet of the stirring and mixing tank 402 is used to input drilling mud A into the stirring and mixing tank 402, and the outlet of the first chemical storage tank 401 is connected to the second inlet of the stirring and mixing tank 402 for inputting treatment chemical B; the first outlet of the stirring and mixing tank 402 is connected to the inlet of the mixed liquid storage tank 403, and the outlet of the mixed liquid storage tank 403 is connected to the inlet of the membrane separator 404; the first outlet of the membrane separator 404 is connected to the inlet of the cold trap 405, and the second outlet of the membrane separator 404 is connected to the inlet of the oil storage tank 406, and the membrane separator 404 is connected to the vacuum unit; the outlet of the cold trap 405 is connected to the inlet of the treatment agent storage tank 407, and the cold trap 405 is connected to the refrigerator; the third outlet of the stirring and mixing tank 402 is connected to the inlet of the first water storage tank 408, and the third outlet of the stirring and mixing tank 402 is connected to the inlet of the first water storage tank 408. The outlet of a water storage tank 408 is connected to the third inlet of the stirring and mixing tank 402; the second outlet of the stirring and mixing tank 402 is connected to the first inlet of the sludge disposal tank 410, and the outlet of the second chemical storage tank 409 is connected to the second inlet of the sludge disposal tank 410; the outlet of the sludge disposal tank 410 is connected to the inlet of the filter press 411, and the first outlet of the filter press 411 is connected to the inlet of the second water storage tank 412, and the second outlet of the filter press 411 is used to discharge sludge.

[0146] The mixing tank 402 can be used to mix the drilling mud and the treatment agent and provide a space for the mixed materials to rest. During the mixing process, the oil in the drilling mud is separated and dissolved in the treatment agent. During the resting process, due to the density difference, the mixture containing the oil and the treatment agent floats on the top layer, while the mud residue without the oil settles to the bottom layer, thereby removing the oil from the drilling mud.

[0147] The vacuum unit is used to provide a vacuum environment for the membrane separator 404. After the mixed liquid containing the oil product and the treatment agent enters the membrane separator 404, under the vacuum conditions, the temperature of the treatment agent in the mixed liquid exceeds its boiling point, causing it to vaporize into a gas. The temperature of the oil product in the mixed liquid remains below its boiling point, thus maintaining its liquid state. The treatment agent and the oil product are then separated. A rotary distributor is provided within the membrane separator 404. After the mixed liquid enters the membrane separator, it forms a continuous, uniform liquid film through the rotary distributor, allowing the treatment agent to rapidly vaporize into a gas and separate from the oil product.

[0148] The functions of the remaining devices can be referred to the above embodiments of the present application and will not be described in detail here.

[0149] It will be appreciated that the apparatus 40 for treating drilling mud provided in the embodiments of the present application does not include a heating device, and can therefore treat the drilling mud and remove oil products therefrom at room temperature, thereby improving the safety of the drilling mud treatment process. Furthermore, the absence of a heating device in the apparatus 40 also reduces the investment cost of the equipment.

[0150] It should also be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, commodity, or apparatus that includes a series of elements includes not only those elements but also other elements not explicitly listed, or includes elements inherent to such process, method, commodity, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, commodity, or apparatus that includes the element.

[0151] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A treatment agent for treating drilling mud, characterized in that: The treatment agent includes a viscosity reducer, a water purifier, hexane and ethyl acetate; the viscosity reducer, the water purifier, the hexane and the ethyl acetate are respectively calculated in mass percentage as follows: 1%-3% viscosity reducer, 1%-3% water purifier, 40%-50% hexane and 40%-50% ethyl acetate, and the total mass percentage of each component is 100%.

2. The treating agent for treating drilling mud according to claim 1, characterized in that: The viscosity reducing agent includes anionic surfactants and / or nonionic surfactants.

3. The treating agent for treating drilling mud according to claim 2, characterized in that: The anionic surfactant includes at least one of carboxylates, sulfonates and polyoxyethylene fatty sulfate; the nonionic surfactant includes at least one of block polyethers with amines as initiators, block polyethers with alcohols as initiators, alkylphenol-formaldehyde resin block polyethers and phenolamine-formaldehyde resin block polyethers.

4. The treating agent for treating drilling mud according to claim 1, characterized in that: The water purifier includes at least one of polyaluminum chloride, polyaluminum ferric chloride, basic aluminum chloride, polyacrylamide, ferrous sulfate, aluminum sulfate and polyferric sulfate.

5. A method for treating drilling mud using the treating agent according to any one of claims 1 to 4, characterized in that: The method includes: mixing the treatment agent with drilling mud and stirring to obtain a first mixed material; after stirring, standing for a first preset time to obtain a first mixed liquid and a first mud residue; wherein, after the first preset time, the first mixed material is separated into layers, the upper layer being the first mixed liquid and the lower layer being the first mud residue, and the first mixed liquid includes an oil product and the treatment agent.

6. The method according to claim 5, characterized in that After obtaining the first mixed solution, the method further comprises: The oil product and the treatment agent in the first mixed liquid are separated under vacuum conditions, and the separated oil product and the treatment agent are recovered respectively.

7. The method according to claim 5, characterized in that After obtaining the first sludge, the method further includes: transporting the first sludge to a filter press for processing.

8. The method according to claim 7, characterized in that The conveying of the first sludge to the filter press for processing specifically includes: adding water to the first sludge and mixing and stirring to obtain a second mixed material, and letting it stand for a second preset time after stirring to obtain a second sludge; wherein, after the second preset time, the second mixed material is separated into layers, and the lower layer is the second sludge; and conveying the second sludge to the filter press for processing.

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