Oil-based drilling cuttings-based fuel preparation system

Abstract

The utility model discloses a kind of fuel preparation systems based on oil-based drilling cuttings, it is related to oil-based drilling cuttings recycling technical field, and wherein, fuel preparation system based on oil-based drilling cuttings includes raw material pretreatment device, mixing device and forming device. Among them, raw material pretreatment device includes oil-based drilling cuttings pyrolysis device and biomass carbonization device;Mixing device is used to mix pyrolysis ash and carbide, and its feed inlet is connected to the outlet end of oil-based drilling cuttings pyrolysis device and biomass carbonization device;Forming device includes forming mould and press-down component, the output end of mixing device is set to forming mould in correspondence, to be used for guiding mixture material into forming mould, press-down component is used to press the mixture material in forming mould;In the overall system of the scheme, a complete production system is formed, and efficient resource utilization of oil-based drilling cuttings is successfully realized.

Description

Technical Field

[0001] This utility model relates to the field of oil-based drill cuttings recycling technology, and in particular to a fuel preparation system based on oil-based drill cuttings. Background Technology

[0002] With the transformation of the global energy structure and increasingly stringent environmental protection requirements, shale gas, as an important unconventional natural gas resource, has been developed on a large scale in my country. Shale oil and gas well drilling typically uses oil-based drilling fluids. During drilling with oil-based fluids, the cuttings produced by the drill bit breaking through the formation rock are carried to the surface along with the oil-based fluid. The solids are then separated by a solids control system, with the liquid phase reinjected into the wellbore for recycling, while the solid phase becomes the oil-based drill cuttings. These drill cuttings contain petroleum hydrocarbons, chemical treatment agents, salts, and heavy metal ions (such as lead, cadmium, and chromium), all of which are environmentally harmful pollutants and have been listed in the "National Hazardous Waste List." Improper handling will cause serious pollution to the soil, water bodies, and atmosphere.

[0003] Currently, the main technologies for treating oil-based drill cuttings include landfill, pyrolysis, incineration, and solvent extraction. While landfill is simple to operate, it wastes land resources and poses a risk of long-term environmental pollution. Pyrolysis can effectively reduce oil content, but its processing cost is high. Incineration can reduce volume, but it produces secondary pollutants such as dioxins.

[0004] Studies have shown that the ash produced from the pyrolysis of oil-based drill cuttings has certain combustible properties, but due to its low H / C atomic ratio (usually less than 0.5), it suffers from problems such as difficulty in ignition and incomplete combustion. Mixing the pyrolysis ash from oil-based drill cuttings with a low H / C atomic ratio and biochar with a high H / C atomic ratio in a certain proportion can effectively improve the poor combustion performance of the ash. Current laboratory research processes involve using pyrolysis products of oil-based drill cuttings and biochar as raw materials, adding binders and combustion improvers to prepare fuel.

[0005] In the current technology, systematic research on the preparation of fuel by mixing oil-based drill cuttings with biomass is still at the laboratory stage. The integration of the entire process from pretreatment to molding is insufficient, and there is a lack of a complete set of process equipment to realize the efficient resource utilization of oil-based drill cuttings. Utility Model Content

[0006] The main objective of this invention is to propose a fuel preparation system based on oil-based drill cuttings. This system aims to address the current situation where systematic research on the preparation of fuel by mixing oil-based drill cuttings with biomass remains at the laboratory stage, and the integration of the entire process from pretreatment to molding is insufficient. Furthermore, there is a lack of a complete set of process equipment to achieve efficient resource utilization of oil-based drill cuttings.

[0007] To achieve the above objectives, the present invention proposes a fuel preparation system based on oil-based drill cuttings, comprising: Raw material pretreatment equipment includes an oil-based drill cuttings pyrolysis unit and a biomass carbonization unit; A mixing device for mixing pyrolysis ash and carbides, with its inlet connected to the outlet of the oil-based drill cuttings pyrolysis device and the biomass carbonization device; A molding device includes a molding die and a pressing component. The output end of the mixing device is configured corresponding to the molding die for introducing a mixture into the molding die. The pressing component is used to apply pressure to the mixture in the molding die.

[0008] In one embodiment, the oil-based drill cuttings-based fuel preparation system further includes a crushing and screening device; The crushing and screening device includes a refining component and a sorting component. The open end of the refining component is connected to the outlet end of the oil-based drill cuttings pyrolysis device and the biomass carbonization device. The sorting component is located below the refining component to filter the refined material.

[0009] In one embodiment, the sorting component includes a first outlet and a second outlet; The first outlet is connected to the feed inlet of the mixing device, and a circulating conveying device is provided between the second outlet and the feed inlet of the refining component.

[0010] In one embodiment, the oil-based drill cuttings-based fuel preparation system further includes an automatic feeding and metering device, the output of which is connected to the inlet of the mixing device for quantitatively dispensing the liquid mixture into the mixing device.

[0011] In one embodiment, the automatic feeding and metering device includes a mixing component and multiple metering components, one end of each of the multiple metering components is connected to the mixing component, and the output end of the mixing component is connected to the feed inlet of the mixing device.

[0012] In one embodiment, the oil-based drill cuttings-based fuel preparation system further includes a drying device; The forming apparatus further includes a conveying structure, one end of which extends at least partially into the drying apparatus.

[0013] In one embodiment, a pressing region is formed below the output end of the pressing component, and a support structure is provided below the conveying structure and corresponding to the pressing region.

[0014] In one embodiment, the oil-based drill cuttings-based fuel preparation system further includes a demolding structure disposed between the pressing assembly and the drying device for separating the mold and the formed material.

[0015] In one embodiment, the oil-based drill cuttings-based fuel preparation system further includes a detection device located on one side of the drying device for detecting the strength of the dried material.

[0016] In one embodiment, the oil-based drill cuttings pyrolysis device and the biomass carbonization device are both connected to the open end of the refining component via a feeding structure, which includes a belt feeding structure.

[0017] The overall system of this solution forms a complete production system that can recycle oil-based drill cuttings. In the entire system structure, through the coordinated production of multiple devices, ash and biomass carbon can be recombined to generate fuel with excellent combustibility, successfully realizing the efficient resource utilization of oil-based drill cuttings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 A schematic diagram of the overall structure of an embodiment of the fuel preparation system based on oil-based drill cuttings provided by this utility model; Figure 2 for Figure 1 A schematic diagram of the conveyor structure and the forming mold.

[0020] Explanation of icon numbers: 100. Fuel preparation system based on oil-based drill cuttings; 1. Oil-based drill cuttings pyrolysis device; 2. Biomass carbonization device; 3. Feeding structure; 4. Crushing and screening device; 41. Refining component; 42. Sorting component; 421. First discharge outlet; 422. Second discharge outlet; 5. Mixing device; 6. Automatic feeding and metering device; 61. Mixing component; 62. Metering component; 7. Drying device; 71. Conveying structure; 72. Supporting structure; 8. Forming device; 81. Forming mold; 811. Base plate; 812. Enclosing part; 82. Pressing component; 9. Detection device; 91. Mounting frame; 92. Robotic arm component.

[0021] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0023] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0024] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0025] With the transformation of the global energy structure and increasingly stringent environmental protection requirements, shale gas, as an important unconventional natural gas resource, has been developed on a large scale in my country. Shale oil and gas well drilling typically uses oil-based drilling fluids. During drilling with oil-based fluids, the cuttings produced by the drill bit breaking through the formation rock are carried to the surface along with the oil-based fluid. The solids are then separated by a solids control system, with the liquid phase reinjected into the wellbore for recycling, while the solid phase becomes the oil-based drill cuttings. These drill cuttings contain petroleum hydrocarbons, chemical treatment agents, salts, and heavy metal ions (such as lead, cadmium, and chromium), all of which are environmentally harmful pollutants and have been listed in the "National Hazardous Waste List." Improper handling will cause serious pollution to the soil, water bodies, and atmosphere.

[0026] Currently, the main technologies for treating oil-based drill cuttings include landfill, pyrolysis, incineration, and solvent extraction. While landfill is simple to operate, it wastes land resources and poses a risk of long-term environmental pollution. Pyrolysis can effectively reduce oil content, but its processing cost is high. Incineration can reduce volume, but it produces secondary pollutants such as dioxins.

[0027] Studies have shown that the ash produced from the pyrolysis of oil-based drill cuttings has certain combustible properties, but due to its low H / C atomic ratio (usually less than 0.5), it suffers from problems such as difficulty in ignition and incomplete combustion. Mixing the pyrolysis ash from oil-based drill cuttings with a low H / C atomic ratio and biochar with a high H / C atomic ratio in a certain proportion can effectively improve the poor combustion performance of the ash. Current laboratory research processes involve using pyrolysis products of oil-based drill cuttings and biochar as raw materials, adding binders and combustion improvers to prepare fuel.

[0028] In the current technology, systematic research on the preparation of fuel by mixing oil-based drill cuttings with biomass is still at the laboratory stage. The integration of the entire process from pretreatment to molding is insufficient, and there is a lack of a complete set of process equipment to realize the efficient resource utilization of oil-based drill cuttings.

[0029] This invention proposes a fuel preparation system 100 based on oil-based drill cuttings to solve the above problems.

[0030] Please see Figure 1 In one embodiment of this utility model, the oil-based drill cuttings-based fuel preparation system 100 includes a raw material pretreatment device, a mixing device 5, and a molding device 8. The raw material pretreatment device includes an oil-based drill cuttings pyrolysis device 1 and a biomass carbonization device 2. The mixing device 5 is used to mix pyrolysis ash and carbides, and its inlet is connected to the outlets of the oil-based drill cuttings pyrolysis device 1 and the biomass carbonization device 2. The molding device 8 includes a molding die 81 and a pressing component 82. The output end of the mixing device 5 is positioned corresponding to the molding die 81 to introduce the mixture into the molding die 81, and the pressing component 82 applies pressure to the mixture in the molding die 81.

[0031] The aforementioned oil-based drill cuttings-based fuel preparation system 100 has a complete production and preparation system. Specifically, the main components of the fuel include oil-based drill cuttings ash and biomass carbon. The oil-based drill cuttings ash needs to be pyrolyzed in a pyrolysis device. The water vapor and oil vapor generated during pyrolysis can be collected again, and after heat exchange and condensation, the oil can be recovered. During the pyrolysis of the oil-based drill cuttings, the biomass carbonization device 2 can simultaneously carbonize the biomass at high temperatures. Both processes produce ash and biomass carbon respectively. In the corresponding production devices, the two main raw materials are quantitatively fed into the mixing device 5 through a discharge structure. When the mixing device 5 is working, it promotes thorough mixing of the two raw materials. During this process, to improve the adhesion between the raw materials, a certain amount of solution reagent can be appropriately added to the mixing device 5. The specific amount can be adjusted according to the amount of ash and biomass carbon added. After mixing, the material is discharged from the discharge end of the mixing device 5 into the molding mold 81 in the molding device 8. The output end of the pressing component 82 is set above the molding mold 81. During its operation, it can apply a certain downward pressure to the mixture in the molding mold 81, thereby compacting the mixed raw materials to form an integral structure.

[0032] It is conceivable that the operation of the pressing component 82 is intermittent. In the actual production process, the molding die 81 can be set to multiple, and the discharge structure of the discharge end of the mixing device 5 also needs to be controlled to discharge the mixed material quantitatively into multiple molding dies 81 in an intermittent discharge manner, so that the mixed material can be continuously pressed and molded by the intermittent operation of the pressing component 82.

[0033] To ensure the combustion effect of the briquetted fuel, the ash and biochar need to be thoroughly mixed to increase the effective contact area between them. Preferably, the ash and biochar are refined before being mixed and briquetted to achieve this effect.

[0034] In some embodiments, to address the aforementioned issues, the oil-based drill cuttings fuel preparation system 100 further includes a crushing and screening device 4; the crushing and screening device 4 includes a refining component 41 and a sorting component 42, the open end of the refining component 41 is connected to the outlet end of the oil-based drill cuttings pyrolysis device 1 and the biomass carbonization device 2, and the sorting component 42 is located below the refining component 41 for filtering the refined material.

[0035] Specifically, the refining component 41 includes a jaw crusher or a crushing roller device. In actual production, after the raw materials generated by the oil-based drill cuttings pyrolysis device 1 and the biomass carbonization device 2 are cooled, the corresponding discharge device will quantitatively feed the generated raw materials onto the refining component 41. The refining component 41 fully refines the ash and biomass carbon. The refining process is also a preliminary mixing process. After refining, the material is filtered by the sorting component 42. The material that meets the production requirements can proceed to the next step of molding after filtration.

[0036] As described above, the refined raw materials need to be filtered through the sorting component 42. Particles that do not pass through the sorting component 42 can be further refined to avoid material waste.

[0037] To achieve the above effects, in some embodiments, the sorting component 42 includes a first outlet 421 and a second outlet 422; the first outlet 421 is connected to the feed inlet of the mixing device 5, and a circulating conveying device is provided between the second outlet 422 and the feed inlet of the refining component 41.

[0038] The first discharge outlet 421 is the main discharge outlet, which corresponds to the feed inlet of the mixing device 5. In order to meet the relevant requirements of production control, it is preferable to install a corresponding discharge control device at the first discharge outlet 421 to control the amount of refined material input in real time according to the actual production situation.

[0039] Preferably, the first discharge outlet 421 can be arranged vertically. For the sorting component 42, it can be configured as a filter element of a conveyor belt structure, with the two ends of the filter screen connected and installed on two rotating roller structures like a traditional conveyor belt structure. The material is filtered vertically, and the filtered material is transported horizontally above the filter screen. Correspondingly, the second discharge outlet 422 can be arranged horizontally, corresponding to one end of the filter screen, so that the filtered material can be automatically discharged from the inner cavity of the crushing and screening device 4.

[0040] As described above, after the refined ash and biomass carbon are mixed by the mixing device 5, they need to be pressed into shape by the molding device 8. In order to ensure the adhesion between the powder structures, a certain amount of liquid, including water, binder, sulfur fixative and combustion aid, will be added during the material mixing process.

[0041] In some embodiments, in order to achieve quantitative dispensing of the above-mentioned additives, the oil-based drill cuttings-based fuel preparation system 100 further includes an automatic feeding metering device 6, the output end of which is connected to the inlet of the mixing device 5 for quantitative dispensing of the liquid mixture into the mixing device 5.

[0042] Specifically, the automatic feeding and metering device 6 includes a mixing component 61 and multiple metering components 62. One end of each of the multiple metering components 62 is connected to the mixing component 61, and the output end of the mixing component 61 is connected to the feed inlet of the mixing device 5.

[0043] In actual operation, a certain amount of reagent is pre-loaded into each of the multiple metering components 62. During actual production, based on the input amounts of ash and biochar, the multiple metering components are controlled to quantitatively add a certain amount of reagent to the mixing component 61. The mixing component 61 then starts working, thoroughly pre-mixing the various reagents, and then guiding the mixed reagents through a conduit to the mixing device 5, so that it can be thoroughly mixed with the refined ash and biochar, thereby improving the bonding effect between the two raw materials and enhancing the combustion effect during the combustion process.

[0044] In some embodiments, the oil-based drill cuttings-based fuel preparation system 100 further includes a drying device 7; the forming device 8 further includes a conveying structure 71, one end of which extends at least partially into the drying device 7.

[0045] A conveying structure 71 is provided between the molding device 8 and the drying device 7, which allows the material to be directly conveyed into the drying device 7 for drying after molding, thereby effectively improving the production efficiency of the entire production process.

[0046] Specifically, the transmitted structure 71 is preferably configured as follows: Figure 1 and Figure 2 The chain conveyor structure 71 shown has two parallel conveyor chains that are driven cyclically by two sets of coaxial sprockets. In actual production, the forming carrier is placed between the two chains, with each end of the forming carrier supported by one of the chains. When the two chains move, they drive the forming carrier toward the drying device 7.

[0047] In the actual molding process, multiple molding carriers are placed sequentially on the chain conveyor structure 71 in the manner described above. The chain conveyor structure 71 drives the molding carriers to move intermittently in one direction. During this process, materials are sequentially fed into the multiple molding carriers through the discharge port of the mixing device 5, and the material in the carriers is extruded and molded by the pressing component 82. The molded material continues to be transported forward and dried in the drying device 7. The above structure effectively improves the production efficiency in the production process.

[0048] In some embodiments, a pressing region is formed below the output end of the pressing component 82, and a support structure 72 is provided below the conveying structure 71 and corresponding to the pressing region.

[0049] The support structure 72 is positioned corresponding to the pressing area. When the corresponding carrier structure moves to the pressing area, the support structure 72 can lift the forming carrier upwards to a certain height, thereby cooperating with the pressing component 82 to squeeze the material. This structure can effectively reduce the downward pressure on the conveying structure 71, thus effectively ensuring its service life. The support structure 72 can be configured as a hydraulic cylinder, pneumatic cylinder, etc., and its end can be provided with a plate-like structure to increase the area of ​​its support contact surface.

[0050] To prevent difficulty in separating the shaped material from the molding die 81 during the drying process, in some embodiments, the oil-based drill cuttings-based fuel preparation system 100 further includes a demolding structure disposed between the pressing assembly 82 and the drying device 7 for separating the die and the shaped material.

[0051] The demolding structure is preferably configured as a robotic arm assembly 92, and the molding die 81 is preferably configured as a combined die, such as... Figure 1 and Figure 2 As shown, it includes a base plate 811 and an enclosure 812. During molding, the enclosure 812 is placed on the base plate 811 and is roughly positioned by a recessed groove on the base plate 811. After molding is complete, the robotic arm assembly 92 lifts the enclosure 812 upwards, separating the enclosure 812 from the molded material. The molded material then enters the drying device 7 along with the base plate 811 for drying.

[0052] The fuel after molding needs to meet certain strength requirements. Therefore, the oil-based drill cuttings-based fuel preparation system 100 also includes a detection device 9, which is located on one side of the drying device 7 to detect the strength of the dried material.

[0053] The detection device 9 is preferably configured as a microwave humidity sensor, which can obtain the moisture content in the agglomerated fuel and thus determine its overall strength value by the degree of dryness of the fuel.

[0054] The oil-based drill cuttings pyrolysis device 1 and the biomass carbonization device 2 are both connected to the open ends of the refining component 41 via a feeding structure 3, which includes a belt feeding structure. It is conceivable that, in addition to the aforementioned belt feeding structure, an auger feeding structure or similar can also be used; a suitable feeding structure can be selected based on the actual production situation.

[0055] In terms of specific structural settings, the crushing and screening device 4, the mixing device 5, and the automatic feeding and metering device 6 are smaller than the oil-based drill cuttings pyrolysis device 1 and the biomass carbonization device 2. Therefore, in the specific structure, the crushing and screening device 4, the mixing device 5, and the automatic feeding and metering device 6 are mounted on the same mounting frame 91 to make the entire system structure more compact.

[0056] The overall system of this solution forms a complete production system that can recycle oil-based drill cuttings. In the entire system structure, through the coordinated production of multiple devices, ash and biomass carbon can be recombined to generate fuel with excellent combustibility, successfully realizing the efficient resource utilization of oil-based drill cuttings.

[0057] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A fuel preparation system based on oil-based drill cuttings, characterized in that, include: Raw material pretreatment equipment includes an oil-based drill cuttings pyrolysis unit and a biomass carbonization unit; A mixing device for mixing pyrolysis ash and carbides, with its inlet connected to the outlet of the oil-based drill cuttings pyrolysis device and the biomass carbonization device; A molding device includes a molding die and a pressing component. The output end of the mixing device is configured corresponding to the molding die for introducing a mixture into the molding die. The pressing component is used to apply pressure to the mixture in the molding die.

2. The fuel preparation system based on oil-based drill cuttings as described in claim 1, characterized in that, The oil-based drill cuttings-based fuel preparation system also includes a crushing and screening device; The crushing and screening device includes a refining component and a sorting component. The open end of the refining component is connected to the outlet end of the oil-based drill cuttings pyrolysis device and the biomass carbonization device. The sorting component is located below the refining component to filter the refined material.

3. The fuel preparation system based on oil-based drill cuttings as described in claim 2, characterized in that, The sorting component includes a first outlet and a second outlet; The first outlet is connected to the feed inlet of the mixing device, and a circulating conveying device is provided between the second outlet and the feed inlet of the refining component.

4. The fuel preparation system based on oil-based drill cuttings as described in claim 1, characterized in that, The oil-based drill cuttings-based fuel preparation system also includes an automatic feeding and metering device, the output of which is connected to the inlet of the mixing device for quantitatively dispensing the liquid mixture into the mixing device.

5. The fuel preparation system based on oil-based drill cuttings as described in claim 4, characterized in that, The automatic feeding and metering device includes a mixing component and multiple metering components. One end of each of the multiple metering components is connected to the mixing component, and the output end of the mixing component is connected to the feed inlet of the mixing device.

6. The fuel preparation system based on oil-based drill cuttings as described in claim 1, characterized in that, The oil-based drill cuttings-based fuel preparation system also includes a drying device; The forming apparatus further includes a conveying structure, one end of which extends at least partially into the drying apparatus.

7. The fuel preparation system based on oil-based drill cuttings as described in claim 6, characterized in that, A pressing area is formed below the output end of the pressing component, and a support structure is provided below the conveying structure and corresponding to the pressing area.

8. The fuel preparation system based on oil-based drill cuttings as described in claim 6, characterized in that, The oil-based drill cuttings-based fuel preparation system also includes a demolding structure located between the pressing assembly and the drying device for separating the mold and the formed material.

9. The fuel preparation system based on oil-based drill cuttings as described in claim 8, characterized in that, The oil-based drill cuttings-based fuel preparation system also includes a detection device located on one side of the drying device for detecting the strength of the dried material.

10. The fuel preparation system based on oil-based drill cuttings as described in claim 2, characterized in that, The oil-based drill cuttings pyrolysis device and the biomass carbonization device are all connected to the open end of the refining component via a feeding structure, which includes a belt feeding structure.

Images