CN116213432A - Shale gas oil-based rock debris treatment method - Google Patents
Shale gas oil-based rock debris treatment method Download PDFInfo
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- CN116213432A CN116213432A CN202310126966.9A CN202310126966A CN116213432A CN 116213432 A CN116213432 A CN 116213432A CN 202310126966 A CN202310126966 A CN 202310126966A CN 116213432 A CN116213432 A CN 116213432A
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- oil
- thermal desorption
- based rock
- rock debris
- shale gas
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/40—Destroying solid waste or transforming solid waste into something useful or harmless involving thermal treatment, e.g. evaporation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
Abstract
The invention provides a shale gas oil-based rock debris treatment method, and relates to the technical field of oil-gas field solid waste treatment. The shale gas oil-based rock debris treatment method comprises the following treatment steps of S1: collecting oil-based rock fragments generated by shale gas exploitation, conveying the oil-based rock fragments after the collection into a thermal desorption main body reactor through conveying equipment for reaction treatment, and heating the oil-based rock fragments in the thermal desorption main body reactor; s2: the thermal desorption main body reactor is heated to volatilize mineral oil and moisture in the oil-based rock debris, and water and oil steam enter a condenser through a collecting pipeline to be condensed. The oil-based rock debris generated by shale gas exploitation is safely treated in a harmless way through a thermal desorption treatment mode, so that the treated oil-based rock debris and waste residues can achieve the effect of safe use, and the whole treatment system has low process treatment cost and high safety and environmental protection.
Description
Technical Field
The invention relates to the technical field of oil and gas field solid waste treatment, in particular to a shale gas oil-based rock debris treatment method.
Background
Shale gas is an emerging clean energy and new mineral species, has important influence on the energy structure of China, and has the recoverable resource quantity of 2.05 trillion m 3， The shale gas has 8.2 percent of the national recoverable resource, plays a role in the development of industry and economy and society of the Chongqing market, but brings great economic benefit and energy resource benefit to shale gas exploration and development and brings a series of ecological environment problems, such as large disturbance of the earth surface, large occupied area of land resources and water resourcesThe oil-based drilling oil-containing rock debris generated in the horizontal drilling process is a significant challenge which plagues shale gas development besides fracturing and back-off wastewater.
The shale gas drilling machine oil-containing rock chips are bottom rock chips which are returned to the ground along with oil-based drilling fluid in the horizontal well drilling process and separated by a vibrating screen, a large amount of waste oil-based drilling fluid which is difficult to clean is adhered to the surfaces of the rock chips, the content of waste diesel oil is relatively high, the waste diesel oil is purified and reused in the conventional treatment mode of the drilling oil-containing rock chips mainly by adopting a thermal analysis technology, a friction thermal analysis technology, a supercritical fluid extraction technology and the like, but the treatment mode is relatively high in cost and easy to pollute the surrounding environment in the treatment process, and therefore, a shale gas oil-based rock chip treatment method is provided by a person skilled in the art and is used for solving the technical problems.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a shale gas oil-based rock debris treatment method, which solves the problems of poor environmental protection and high environmental protection of oil-based rock debris treatment generated by shale gas exploitation.
In order to achieve the above purpose, the invention is realized by the following technical scheme: the shale gas oil-based rock debris treatment method comprises the following treatment steps:
s1: collecting oil-based rock fragments generated by shale gas exploitation, conveying the oil-based rock fragments after the collection into a thermal desorption main body reactor through conveying equipment for reaction treatment, and heating the oil-based rock fragments in the thermal desorption main body reactor;
s2: heating the thermal desorption main body reactor to volatilize mineral oil and water in the oil-based rock debris by heating, enabling water and oil steam to enter a condenser through a collecting pipeline for condensation treatment, and discharging the condensed water and oil steam into a separating tank to finish oil-water two-phase separation;
s3: non-condensable gas in the condenser enters a cleaning tank through a connecting pipeline for cleaning and washing, and the cleaning tank discharges the non-condensable gas in the condenser into a combustion chamber through the connecting pipeline for mixed combustion after the non-condensable gas in the condenser is washed;
s4: after the oil-based rock debris deoiling treatment is finished by the thermal desorption main body reactor, the oil-based rock debris is treated again and then discharged into a slag storage tank for storage, ash in the slag storage tank is transmitted to brick processing equipment through a pipeline or transmission equipment to carry out brick product processing operation, and the brick processing equipment packages and conveys the brick products through conveying and packaging equipment after the brick products are processed.
Preferably, the thermal desorption main body reactor in the step S1 is one or more of a hot distillation furnace and a brick returning kiln, the heating mode of the thermal desorption main body reactor is indirect heating, the heating temperature is 400-420 ℃, and the heating time is 6-8 h.
Preferably, in the step S2, the condenser adopts an indirect water cooling mode to cool water and oil vapor in the condenser to a liquid phase.
Preferably, combustion-supporting mixed combustion is performed by mixing the non-condensable gas in the combustion chamber in the step S3 with natural gas.
Preferably, after deoiling the oil-based rock debris, the thermal desorption main reactor in the step S4 is cooled to normal temperature by adopting multi-stage condensing equipment, and then conveyed into a slag storage pool for temporary storage through a pipeline.
Preferably, the internal irradiation index of ash slag after the treatment of the thermal desorption main reactor is not more than 1.0, and the external irradiation index is not more than 1.0.
Preferably, the shale gas oil-based rock debris treatment system comprises conveying equipment, wherein a discharge port of the conveying equipment is communicated with a feed inlet of a thermal desorption main body reactor through a connecting pipeline, a steam discharge port of the thermal desorption main body reactor is communicated with an air inlet of a condenser through a collecting pipeline, an exhaust port of the condenser is communicated with an inlet of a separation tank through a connecting pipeline, an outlet of the separation tank is communicated with an inlet of an oil collecting barrel through a connecting pipeline, a noncondensable gas discharge port of the condenser is communicated with an inlet of a cleaning tank through a collecting pipeline, and an exhaust port of the cleaning tank is communicated with an air inlet of a combustion chamber through a connecting pipeline.
Preferably, the discharge port of the thermal desorption main body reactor is communicated with the feed port of the slag storage tank through a connecting pipeline, the discharge port of the slag storage tank is connected with the feed port of brick processing equipment through a connecting pipeline, and the discharge port of the brick processing equipment is communicated with the feed port of conveying and packing equipment.
The invention provides a shale gas oil-based cuttings treatment system method. The beneficial effects are as follows:
1. according to the invention, the oil-based rock debris generated by shale gas exploitation is subjected to harmless safe treatment in a thermal desorption treatment mode, so that the treated oil-based rock debris and waste residues can achieve the safe use effect, the process treatment cost of the whole treatment system is low, the surrounding environment is not polluted in the treatment process, and the safety and environmental friendliness are high.
2. The clinker generated in the oil-based rock debris treatment process is subjected to multiple cooling treatments, the clinker is used as a basic raw material of brick products after being cooled to normal temperature, and the clinker is prepared into the brick products by brick processing equipment, so that the harmless treatment of the oil-based rock debris treatment derivative is realized, and the comprehensive utilization of resources is realized.
Drawings
FIG. 1 is a schematic process flow diagram of a treatment system according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples:
as shown in fig. 1, the embodiment of the invention provides a shale gas oil-based rock debris treatment system, which comprises conveying equipment, wherein a discharge port of the conveying equipment is communicated with a feed port of a thermal desorption main body reactor through a connecting pipeline, a steam discharge port of the thermal desorption main body reactor is communicated with an air inlet of a condenser through a collecting pipeline, an air outlet of the condenser is communicated with an inlet of a separation tank through a connecting pipeline, an outlet of the separation tank is communicated with an inlet of an oil collecting barrel through a connecting pipeline, a non-condensable gas discharge port of the condenser is communicated with an inlet of a cleaning tank through a collecting pipeline, and an air outlet of the cleaning tank is communicated with an air inlet of a combustion chamber through a connecting pipeline.
The discharge gate of thermal desorption main part reactor passes through connecting tube and the pan feeding mouth intercommunication of slag storage pond, and the discharge gate of slag storage pond passes through connecting tube and is connected with the pan feeding mouth of brick class processing equipment, and the discharge gate of brick class processing equipment communicates with the pan feeding mouth of carrying packing equipment.
The shale gas oil-based rock debris treatment method comprises the following treatment steps:
s1: collecting oil-based rock fragments generated by shale gas exploitation, conveying the oil-based rock fragments after the collection into a thermal desorption main body reactor through conveying equipment for reaction treatment, and heating the oil-based rock fragments in the thermal desorption main body reactor;
s2: heating the thermal desorption main body reactor to volatilize mineral oil and water in the oil-based rock debris by heating, enabling water and oil steam to enter a condenser through a collecting pipeline for condensation treatment, and discharging the condensed water and oil steam into a separating tank to finish oil-water two-phase separation;
s3: non-condensable gas in the condenser enters a cleaning tank through a connecting pipeline for cleaning and washing, and the cleaning tank discharges the non-condensable gas in the condenser into a combustion chamber through the connecting pipeline for mixed combustion after the non-condensable gas in the condenser is washed;
s4: after the oil-based rock debris deoiling treatment is finished by the thermal desorption main body reactor, the oil-based rock debris is treated again and then discharged into a slag storage tank for storage, ash in the slag storage tank is transmitted to brick processing equipment through a pipeline or transmission equipment to carry out brick product processing operation, and the brick processing equipment packages and conveys the brick products through conveying and packaging equipment after the brick products are processed.
In the S1 step, the thermal desorption main body reactor is one or more of a thermal distillation furnace and a brick returning kiln, the heating mode of the thermal desorption main body reactor is indirect heating, the heating temperature is 400-420 ℃, and the heating time is 6-8 h.
When the thermal desorption main body reactor is a thermal distillation furnace, the specific processing operation steps are as follows: the oil-based rock debris is conveyed from the storage pool to the vibrating screen through the scraper to remove large particulate matters, and enters the hot distillation furnace through the distributor. The thermal distillation furnace is internally provided with 4 groups of 16 radiant tubes, 4 layers of radiant tubes are uniformly distributed, the thermal distillation furnace is internally provided with an upper chain plate conveyor belt and a lower chain plate conveyor belt, oil-based rock debris is uniformly distributed on the chain plates through the distributing device, and the thermal desorption process is realized under the high-temperature radiation of the radiant tubes.
The conveyor belt is 8m long and 2.5m wide and is driven by a frequency modulation motor arranged outside the furnace body. The oil-based rock scraps move from one end to the other end under the driving action of the chain plate of the hot distillation furnace, so that the heating process is completed. The upper and lower chain plate machines in the furnace can be set up to run at the same speed or in a differential running mode so as to adjust the distribution thickness of the rock scraps on the chain plates and the residence time in the furnace. In the thermal desorption process, the temperature of each part of the thermal distillation furnace is controlled through a radiant tube, the temperature of the upper part in the furnace is controlled to be about 400 ℃, the temperature of the middle part is maintained to be about 380 ℃, the temperature of the lower part is maintained to be about 360 ℃, and the residence time of the oil-based rock debris in the furnace is about 30min.
The volatilized oil and water vapor enter a quenching tower through a pipeline and are sprayed and cooled by cooling water to form an oil-water mixture, then the oil-water mixture enters an oil-water separation tank, diesel oil and wastewater are separated in the separation tank, non-condensable gas is pumped into a dehydration tank in the quenching tower through a water ring vacuum pump, and the dehydration tank is sent to a combustion tank for combustion after passing through a liquid separation tank. The deoiled oil-based rock debris slag is conveyed to a slag outlet of a hot distillation furnace through a chain plate, conveyed out of the furnace through a screw conveyor, cooled to 60 ℃ in an indirect water cooling mode, and conveyed to a slag storage tank through the screw conveyor.
When the thermal desorption main body reactor is a rotary kiln, the specific processing operation steps are as follows: the oil-based rock debris is shoveled from the storage pool to the rotary kiln through the feeding equipment, natural gas in the combustion chamber is combusted and heated, the outer wall of the rotary kiln supplies heat for thermal desorption of the oil-based rock debris, the rotary kiln rotates at 3-5r/min, the oil-based rock debris continuously overturns in the rotary kiln and effectively contacts with the inner wall of the rotary kiln, solid-liquid heat transfer and solid-solid heat transfer occur on the heat transfer surface, and mineral oil and water are heated and evaporated in the thermal desorption process.
The oil-based rock debris is heated to a target temperature of 420 ℃ and stays at the target temperature for about 5 hours, so that mineral oil and water in the oil-based rock debris are fully desorbed. The water and oil vapor enters a condensing unit through a pipeline, oil gas is condensed into liquid through a tubular heat exchanger, a water-oil mixed phase is formed, and the mixed liquid enters an oil-water separation tank for standing and realizing water-oil separation. Non-condensable gas generated in the thermal desorption process enters a combustion chamber through a separation tank to be mixed with natural gas for combustion. Spraying and cooling the deoiled oil-based ash in a rotary kiln to normal temperature, and discharging the oil-based ash into an ash storage tank.
In the step S2, the condenser adopts an indirect water cooling mode to cool water and oil vapor in the condenser to a liquid phase.
The oil-based rock debris is treated and utilized by the process of the treatment system by adopting a thermal desorption process, the operation process characteristics of thermal desorption equipment of a thermal distillation furnace and a rotary kiln are analyzed, and practice shows that: the hot distillation furnace equipment has large processing capacity, high equipment maintenance rate and narrow raw material adaptability; the rotary kiln equipment has low processing capacity, high energy consumption and wide adaptability to raw materials. Therefore, the process of the treatment system realizes the safe disposal and utilization of the oil-based rock debris by adopting the cooperative operation of the thermal distillation furnace and the rotary kiln thermal desorption equipment.
And S3, combustion-supporting mixed combustion is carried out in a mode of mixing the non-condensable gas in the combustion chamber with natural gas.
Analysis of the mineral oil recovered after thermal desorption showed that: the oil-based drilling fluid prepared by using the recovered mineral oil as the base oil is equivalent to the oil-based drilling fluid prepared by using the original No. 0 diesel oil, has good rheological property and emulsifying property, and can be used for preparing the oil-based drilling fluid.
And S4, cooling the oil-based rock debris to normal temperature by adopting multi-stage condensing equipment after the oil-based rock debris is deoiled by the thermal desorption main reactor in the step of conveying the oil-based rock debris into a slag storage pool for temporary storage through a pipeline.
The internal irradiation index of ash slag after the treatment of the thermal desorption main body reactor is less than or equal to 1.0, the external irradiation index of ash slag is less than or equal to 1.0, the ash slag after the thermal desorption of oil-based rock debris is in the form of ash black powder, the oil content is not higher than 2%, and the result shows that by entrusting the unit with hazardous waste detection qualification to analyze the dangerous characteristics of the ash slag after the deoiling: by contrast with the standard identification value in GB 5085.1-3, 6-2007 hazardous waste identification standard, and combining the internal irradiation index and the external irradiation index, the oil-based rock debris has no dangerous characteristics in terms of ash corrosion, flammability, reactivity, leaching toxicity, toxic substance content and acute toxicity after thermal desorption.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The shale gas oil-based rock debris treatment method is characterized by comprising the following treatment steps:
s1: collecting oil-based rock fragments generated by shale gas exploitation, conveying the oil-based rock fragments after the collection into a thermal desorption main body reactor through conveying equipment for reaction treatment, and heating the oil-based rock fragments in the thermal desorption main body reactor;
s2: heating the thermal desorption main body reactor to volatilize mineral oil and water in the oil-based rock debris by heating, enabling water and oil steam to enter a condenser through a collecting pipeline for condensation treatment, and discharging the condensed water and oil steam into a separating tank to finish oil-water two-phase separation;
s3: non-condensable gas in the condenser enters a cleaning tank through a connecting pipeline for cleaning and washing, and the cleaning tank discharges the non-condensable gas in the condenser into a combustion chamber through the connecting pipeline for mixed combustion after the non-condensable gas in the condenser is washed;
s4: after the oil-based rock debris deoiling treatment is finished by the thermal desorption main body reactor, the oil-based rock debris is treated again and then discharged into a slag storage tank for storage, ash in the slag storage tank is transmitted to brick processing equipment through a pipeline or transmission equipment to carry out brick product processing operation, and the brick processing equipment packages and conveys the brick products through conveying and packaging equipment after the brick products are processed.
2. The shale gas oil-based cuttings treatment method according to claim 1, wherein: the thermal desorption main body reactor in the step S1 is one or more of a hot distillation furnace and a brick returning kiln, the heating mode of the thermal desorption main body reactor is indirect heating, the heating temperature is 400-420 ℃, and the heating time is 6-8 h.
3. The shale gas oil-based cuttings treatment method according to claim 1, wherein: in the step S2, the condenser adopts an indirect water cooling mode to cool water and oil vapor in the condenser to a liquid phase.
4. The shale gas oil-based cuttings treatment method according to claim 1, wherein: and in the step S3, combustion-supporting mixed combustion is carried out in a mode of mixing the non-condensable gas in the combustion chamber with natural gas.
5. The shale gas oil-based cuttings treatment method according to claim 1, wherein: and S4, cooling the oil-based rock debris to normal temperature by adopting multi-stage condensing equipment after the oil-based rock debris is deoiled by the thermal desorption main reactor in the step, and conveying the oil-based rock debris into a slag storage pool for temporary storage through a pipeline.
6. The shale gas oil-based cuttings treatment method according to claim 1, wherein: the internal irradiation index of ash slag after the treatment of the thermal desorption main reactor is not more than 1.0, and the external irradiation index is not more than 1.0.
7. A shale gas oil-based cuttings treatment system as claimed in any of claims 1-6, comprising a conveying apparatus, wherein: the discharge port of the conveying equipment is communicated with the feed inlet of the thermal desorption main body reactor through a connecting pipeline, the steam discharge port of the thermal desorption main body reactor is communicated with the air inlet of the condenser through a collecting pipeline, the exhaust port of the condenser is communicated with the inlet of the separation tank through a connecting pipeline, the outlet of the separation tank is communicated with the inlet of the oil collecting barrel through a connecting pipeline, the non-condensable gas discharge port of the condenser is communicated with the inlet of the cleaning tank through a collecting pipeline, and the exhaust port of the cleaning tank is communicated with the air inlet of the combustion chamber through a connecting pipeline.
8. The shale gas oil-based cuttings treatment system of claim 7 wherein: the discharge gate of thermal desorption main part reactor passes through connecting tube and the pan feeding mouth intercommunication of slag storage pond, the discharge gate of slag storage pond passes through connecting tube and is connected with the pan feeding mouth of brick class processing equipment, the discharge gate of brick class processing equipment and the pan feeding mouth intercommunication of carrying the baling equipment.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310126966.9A CN116213432A (en) | 2023-02-17 | 2023-02-17 | Shale gas oil-based rock debris treatment method |
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| CN202310126966.9A CN116213432A (en) | 2023-02-17 | 2023-02-17 | Shale gas oil-based rock debris treatment method |
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| CN116213432A true CN116213432A (en) | 2023-06-06 |
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| CN202310126966.9A Pending CN116213432A (en) | 2023-02-17 | 2023-02-17 | Shale gas oil-based rock debris treatment method |
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- 2023-02-17 CN CN202310126966.9A patent/CN116213432A/en active Pending
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