CN112282678B - Treatment method of shale gas oil-based drilling cutting solid waste - Google Patents
Treatment method of shale gas oil-based drilling cutting solid waste Download PDFInfo
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- 229920000620 organic polymer Polymers 0.000 claims abstract description 98
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/06—Arrangements for treating drilling fluids outside the borehole
- E21B21/063—Arrangements for treating drilling fluids outside the borehole by separating components
- E21B21/065—Separating solids from drilling fluids
- E21B21/066—Separating solids from drilling fluids with further treatment of the solids, e.g. for disposal
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/01—Arrangements for handling drilling fluids or cuttings outside the borehole, e.g. mud boxes
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/06—Arrangements for treating drilling fluids outside the borehole
- E21B21/068—Arrangements for treating drilling fluids outside the borehole using chemical treatment
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Abstract
The invention relates to a method for treating shale gas oil-based drilling cutting solid waste, which is characterized in that oil-water-solid waste layering is realized by using a seaweed organic polymer separating agent so as to realize oil recovery; the seaweed organic polymer oxidant is used for forming advanced oxidation reaction, so that the harmless treatment of solid waste is realized, a high-temperature heating distillation technology or an anaerobic pyrolysis carbonization technology is not adopted, the energy consumption is saved, and the odor and peculiar smell are not generated in the treatment; the treatment method disclosed by the invention separates mud and sand in solid waste by a physical method, and the sand grains are processed by using the seaweed organic polymer curing agent to improve sphericity, have better lubricity, temperature resistance and corrosion resistance, and can be used as fracturing sand for petroleum production, so that the pressure of standard post-treatment or landfill of solid waste treatment can be reduced, and another way for resource utilization is provided for enterprises.
Description
Technical Field
The invention belongs to the technical field of environmental management, and particularly relates to a method for treating shale gas oil-based drilling cutting solid waste.
Background
The oil-based drilling cuttings are solid wastes generated in the exploitation process of oil wells and gas wells, and are complex in components. In the oil and gas production process, a plurality of organic additives are used, and the complexity of the oil-based drilling cutting solid waste components is increased. Generally, the oil content of the solid waste varies, most of the solid waste is about 9% -14%, the water content is high, and alkaline salt, heavy metal and organic pollutants are main harmful components. Because the solid waste has large volume, if the solid waste is not effectively treated and disposed, farmland land pollution and surface water and underground water pollution can be caused, the ecological environment can be seriously damaged, the normal growth of crops can be influenced, and the health of people can be threatened.
The treatment of oil sludge and solid waste produced in oil exploitation has a plurality of more advanced treatment technologies internationally, and China also has a plurality of economic and effective treatment methods. Shale gas exploitation started late in China, scientists have been exploring various economic, effective, energy-saving and environment-friendly technical methods for treating solid waste and sewage and wastewater generated in shale gas exploitation operation, and have developed various economic and effective treatment methods. The current technology for oil separation and solid waste treatment of shale gas oil-based drilling cuttings is developed basically according to the technical methods of oil separation and solid waste treatment of petroleum oil sludge, and besides some original and traditional simple treatment technologies, the more used technical methods mainly comprise a hot distillation technology, a rotary kiln technology and an oxygen-free state pyrolysis carbonization technology. The technologies can effectively realize oil recovery and reduce the oil content of solid waste to below 0.3 percent, reach the standard of solid waste safe disposal, and play a very important role in solving the problem of safe disposal of shale gas oil-based drilling cuttings. Meanwhile, the technologies have some defects and shortcomings, mainly including the following aspects:
high temperature treatment is required, energy is consumed, and carbon emission is generated. If the waste gas is treated at high temperature and discharged improperly, air pollution can be caused, strong peculiar smell can be generated, and the life and health of surrounding residents are influenced. After the solid waste after high-temperature treatment is baked, sintered or pyrolyzed, the solid waste is generally difficult to be used as a building material auxiliary material or a road building auxiliary material and has other ways of resource utilization. On the other hand, the soil resources in China are very precious, and with the continuous development of shale gas, the amount of shale gas oil-based cuttings solid wastes is increased continuously, and the landfill sites of the solid wastes are increasingly deficient. Therefore, the invention provides an energy-saving and environment-friendly technical method, which realizes the recovery of partial oil of solid waste according to the needs, reduces the oil content and organic pollutants of the solid waste, treats heavy metals in the solid waste, and then carries out resource utilization of the solid waste according to the needs, for example, the treated sand grains are used as fracturing sand for petroleum production after being processed and ball-shaped modified.
The present invention has been made in view of the above circumstances.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a method for treating shale gas oil-based drilling cutting solid waste, which adopts a seaweed organic polymer separating agent to separate oil, water and solid waste to realize oil recovery, adopts a seaweed organic polymer oxidant and hydrogen peroxide to form advanced oxidation to perform harmless treatment on the solid waste, and adopts a seaweed organic polymer curing agent to prepare separated sand grains into fracturing sand for petroleum production through processing.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for treating shale gas oil-based drilling cutting solid waste, comprising the following steps:
(1) Oil-water solid waste layering: adding water into the oil-based drilling cutting solid waste, then adding the seaweed organic polymer separating agent, stirring, standing, performing separation reaction to form different layers of oil water and solid waste, and repeatedly adding the seaweed organic polymer separating agent for performing separation reaction according to the content of components in the treated solid waste until the oil water and the solid waste are obviously layered;
(2) Oil recovery: pumping the oil-water layer into an oil-water mixture storage container, standing for 60-90min, and separating oil from water after stabilization so as to recover oil;
(3) Solid waste treatment: after the step (2) is finished, discharging the mixture of the solid waste and the residual water in the step (1) into a solid waste treatment container, adding hydrogen peroxide or organic acid and seaweed organic polymer oxidant, carrying out advanced oxidation reaction, then carrying out dehydration treatment, detecting the content of components in the solid waste, judging whether the hydrogen peroxide or the organic acid and the seaweed organic polymer oxidant are repeatedly added according to the content until the detection meets the standard, sending the obtained solid waste into a storage yard for standing reaction, and standing reaction for not less than 28 days;
(4) Resource utilization: separating mud and sand in the solid waste after the reaction in the step (3), separating out sand grains, adding a seaweed organic polymer curing agent for reaction to obtain modified sand grains, and preparing the modified sand grains into fracturing sand for petroleum production.
According to the treatment method, in the step (1), the algae organic polymer separating agent is adopted to realize obvious layering of oil-water solid waste in a treatment container, oil-water separation is carried out through the step (2), oil recovery is completed, the algae organic polymer separating agent is repeatedly added for separation reaction according to different component contents in the oil-based drilling cutting solid waste until the oil-water solid waste is obviously layered, in the step (3), heavy metals and organic pollutants in the solid waste are reduced through advanced oxidation, the seaweed organic polymer oxidant and hydrogen peroxide or organic acid are adopted as the treatment agent, so that harmless treatment of the solid waste is realized, and in the step (4), the seaweed organic polymer curing agent is added to prepare fracturing sand for petroleum production through mechanical processing.
The method realizes oil-water separation, solid waste harmless treatment and resource utilization, can be used separately or comprehensively, can omit the steps (1) and (2) when only the harmless treatment is needed, can omit the step (3) when the harmless treatment is not needed, and can omit the step (4) when the resource utilization is not needed.
Further, the addition amount of the seaweed organic polymer separating agent in the step (1) is 1-3% of the total volume of the treated oil-based drill cutting solid waste and water, preferably, the stirring time is 30-45min, and the standing time is 60-90min.
Further, the seaweed organic polymer separating agent in the step (1) is prepared by the following method: stirring and crushing the deep sea seaweed, adding 3% sulfuric acid by mass for acidification, adding 35% sodium hydroxide by mass for leaching, filtering, and adding 30% deionized water to obtain the seaweed organic polymer separating agent.
Further, the pH value of the seaweed organic polymer separating agent is 6-9.
Further, the oil-water separation in the step (2) adopts an oil-water separator for separation, so that oil recovery is realized, or clear water is filled into the oil-water layer to raise the water level so that the oil layer naturally overflows and is discharged, so that oil recovery is realized.
Further, in the step (3), the adding amount of the hydrogen peroxide or the organic acid is 10-40% of the total volume of the solid waste and residual water mixture, and the adding amount of the seaweed organic polymer oxidant is 1-5% of the total volume of the solid waste and residual water mixture.
Further, the organic acid is citric acid or oxalic acid.
Further, the seaweed organic polymer oxidant is prepared by the following method: stirring and crushing the deep sea seaweed, adding 35% by mass of sulfuric acid for acidification reaction, adding 35% by mass of sodium hydroxide for leaching and filtering to obtain the seaweed organic polymer oxidant.
Further, the pH value of the seaweed organic polymer oxidant is 10.5-11.5.
Further, the seaweed organic polymer curing agent in the step (4) is prepared by the following method: stirring and crushing the deep sea seaweed, adding dilute sulfuric acid with the mass fraction of 3% for acidification reaction, adding sodium hydroxide with the mass fraction of 3% for leaching and filtering, and adding 1-20% of organic silicon to obtain the seaweed organic polymer curing agent.
Furthermore, the volume of the seaweed organic polymer curing agent is 2-10% of the total volume of the sand grains.
Further, the pH value of the seaweed organic polymer curing agent is 6-9.
Compared with the prior art, the invention has the following beneficial effects:
(1) According to the treatment method of the shale gas oil-based drilling cutting solid waste, oil-water solid waste layering is realized by using the seaweed organic polymer separating agent, so that oil recovery is realized; the seaweed organic polymer oxidant is used for forming advanced oxidation reaction, so that the harmless treatment of solid waste is realized, a high-temperature heating distillation technology or an anaerobic pyrolysis carbonization technology is not adopted, the energy consumption is saved, and the odor and peculiar smell are not generated in the treatment;
(2) The processing method of the invention separates the mud and sand in the solid waste by a physical method, and the sand grains are processed and improved in sphericity by using the seaweed organic polymer curing agent, have better lubricity, temperature resistance and corrosion resistance, and can be used as fracturing sand for petroleum production, thus reducing the pressure of standard-reaching post-treatment or landfill of the solid waste treatment and providing another resource utilization approach for enterprises;
(3) The treatment method is suitable for the operation of a large centralized treatment base and the operation of a dispersive treatment base, has stronger mobility and flexibility, can be completely or partially suitable for the oil separation and harmless treatment of other oil-containing solid wastes in the petroleum and gas industry, and provides a plurality of choices for the solid waste treatment method in the petroleum and gas industry.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a process flow diagram of a treatment method of shale gas oil-based drilling cutting solid waste according to the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
Fig. 1 shows a process flow chart of the shale gas oil-based drilling cutting solid waste treatment method of the invention.
Example 1
Firstly, 10kg of shale gas-oil-based drilling cutting solid waste is placed in a reaction vessel, wherein the solid phase content of the oil-based drilling cutting solid waste is 76%, the water content is 7%, the oil (diesel oil) content is 14%, the main components of the solid phase are Ba, si, S, fe, zn and the like, and the NaCl content is about 1.5%.
The treatment method of the shale gas oil-based drilling cutting solid waste of the embodiment specifically comprises the following steps:
(1) Oil-water solid waste layering: adding water into the solid waste of the oil-based drilling cuttings, covering the surface layer of the solid waste with the water, fully stirring the solid waste and the water to fully mix the solid waste and the water to form a slurry mixture, and then adding a seaweed organic polymer separating agent, wherein the seaweed organic polymer separating agent is prepared by the following method: stirring and crushing deep sea seaweed, adding 3% by mass of sulfuric acid for acidification, adding 35% by mass of sodium hydroxide for leaching, filtering, and adding 30% by mass of deionized water to obtain the seaweed organic polymer separating agent, wherein the pH value of the seaweed organic polymer separating agent is 6-9, the adding amount of the seaweed organic polymer separating agent is 1% of the total volume of the oil-based drilling cutting solid waste to be treated and water, stirring by using an electric stirrer for 30min, stopping stirring, standing for 60min, stirring again for 30min, stopping stirring, standing for 24h in a container, carrying out separation reaction, forming obvious different layers in the container at the moment, wherein the top layer is oil, the middle layer is water, and the bottom layer is solid waste;
(2) Oil recovery: slowly pumping an oil layer and a water layer to an oil-water mixing processor, sending the bottom solid waste to a solid waste processor, standing the oil-water mixture in a container for 60min, separating oil and water in the oil-water mixture by using an oil-water separator, sending the oil into a recovered oil storage container, sending the water into a temporary waste water storage container, and sending the water in the temporary storage container into the solid waste processor;
(3) Solid waste treatment: adding a small amount of clear water into a mixture of residual water and solid waste in a solid waste processor, covering a solid waste surface layer with the water, adding 35% of hydrogen peroxide and a seaweed organic polymer oxidant, stirring for 15min, standing for 60min, and carrying out advanced oxidation reaction, wherein the adding amount of the hydrogen peroxide is 10% of the total volume of the mixture of the solid waste and the residual water, the adding amount of the seaweed organic polymer oxidant is 1% of the total volume of the mixture of the solid waste and the residual water, and the seaweed organic polymer oxidant is prepared by the following method: stirring and crushing deep sea seaweed, adding 35% by mass of sulfuric acid for acidification reaction, adding 35% by mass of sodium hydroxide for leaching and filtering to obtain the seaweed organic polymer oxidant, wherein the pH value of the seaweed organic polymer oxidant is 10.5-11.5, performing high-grade oxidation reaction, performing centrifugal dehydration, feeding water into a temporary waste water storage container, conveying solid waste into a solid waste storage container, and standing for 28 days;
(4) Resource utilization: separating mud and sand in the solid waste after the reaction in the step (3), separating sand grains, adding an alga organic polymer curing agent, wherein the volume of the alga organic polymer curing agent is 6% of the total volume of the sand grains, and the alga organic polymer curing agent is prepared by the following method: stirring and crushing deep sea seaweed, adding dilute sulfuric acid with the mass fraction of 3% for acidification reaction, adding sodium hydroxide with the mass fraction of 3% for leaching and filtering, and adding 1% of organic silicon to obtain the modified sand grains, wherein the pH value of the seaweed organic polymer curing agent is 6-9, and the modified sand grains are prepared into fracturing sand for petroleum production.
Through detection, the proportion of the recovered oil is about 71 percent of the oil content of the shale gas oil-based drilling cuttings. And (3) detecting after the treated solid waste is stood for 28 days, wherein the oil content is lower than 0.3 percent. The wastewater can be recycled after being purified in a temporary storage container. The sand grains separated from the solid waste have good lubricity, good temperature resistance and good corrosion resistance, and after being subjected to sphericity improvement, the sand grains have basic conditions for fracturing sand for petroleum production.
Example 2
Firstly, 10kg of shale gas-oil-based drilling cutting solid waste is placed in a reaction vessel, wherein the solid phase content of the oil-based drilling cutting solid waste is 76%, the water content is 7%, the oil (diesel oil) content is 14%, the main components of the solid phase are Ba, si, S, fe, zn and the like, and the NaCl content is about 1.5%.
The method for treating shale gas oil-based drilling cutting solid waste comprises the following steps:
(1) Oil-water solid waste layering: adding water into the solid waste of the oil-based drilling cuttings, covering the surface layer of the solid waste with the water, fully stirring the solid waste and the water to fully mix the solid waste and the water to form a slurry mixture, and then adding a seaweed organic polymer separating agent, wherein the seaweed organic polymer separating agent is prepared by the following method: stirring and crushing deep sea seaweed, adding 3% by mass of sulfuric acid for acidification, adding 35% by mass of sodium hydroxide for leaching, filtering, and adding 30% by mass of deionized water to obtain the seaweed organic polymer separating agent, wherein the pH value of the seaweed organic polymer separating agent is 6-9, the adding amount of the seaweed organic polymer separating agent is 2% of the total volume of the oil-based drilling cutting solid waste to be treated and water, stirring by using an electric stirrer for 37.5min, stopping stirring, standing for 75min, stirring again for 37.5min, stopping stirring, standing in a container for 24h, carrying out separation reaction, forming obvious different layers in the container at the moment, wherein the top layer is oil, the middle layer is water, and the bottom layer is solid waste;
(2) Oil recovery: slowly pumping an oil layer and a water layer to an oil-water mixing processor, sending the bottom solid waste to a solid waste processor, standing the oil-water mixture in a container for 75min, separating oil and water in the oil-water mixture by using an oil-water separator, sending the oil into a recovered oil storage container, sending the water into a waste water temporary storage container, and sending the water in the temporary storage container into the solid waste processor;
(3) Solid waste treatment: adding a small amount of clear water into a mixture of residual water and solid waste in a solid waste processor, covering a solid waste surface layer with the water, adding 35% of hydrogen peroxide and a seaweed organic polymer oxidant, stirring for 15min, standing for 60min, and carrying out advanced oxidation reaction, wherein the adding amount of the hydrogen peroxide is 25% of the total volume of the mixture of the solid waste and the residual water, the adding amount of the seaweed organic polymer oxidant is 3% of the total volume of the mixture of the solid waste and the residual water, and the seaweed organic polymer oxidant is prepared by the following method: stirring and crushing deep sea seaweed, adding 35% by mass of sulfuric acid for acidification reaction, adding 35% by mass of sodium hydroxide for leaching and filtering to obtain the seaweed organic polymer oxidant, wherein the pH value of the seaweed organic polymer oxidant is 10.5-11.5, performing high-grade oxidation reaction, performing centrifugal dehydration, allowing water to enter a temporary waste water storage container, conveying solid waste to a solid waste storage container, and standing for 30 days;
(4) Resource utilization: separating mud and sand in the solid waste after the reaction in the step (3), separating out sand grains, adding an organic seaweed polymer curing agent, wherein the volume of the organic seaweed polymer curing agent is 2 percent of the total volume of the sand grains, and the organic seaweed polymer curing agent is prepared by the following method: stirring and crushing deep sea seaweed, adding dilute sulfuric acid with the mass fraction of 3% for acidification reaction, adding sodium hydroxide with the mass fraction of 3% for leaching and filtering, and adding 10% of organic silicon to obtain the modified sand grains, wherein the pH value of the seaweed organic polymer curing agent is 6-9, and the modified sand grains are prepared into fracturing sand for petroleum production.
Through detection, the proportion of the recovered oil is about 65% of the oil content of the shale gas-oil-based drilling cuttings. And (3) detecting after the treated solid waste is stood for 30 days, wherein the oil content is lower than 0.3%. The wastewater can be recycled after being purified in a temporary storage container. The sand grains separated from the solid waste have good lubricity, good temperature resistance and good corrosion resistance, and have basic conditions for fracturing sand for petroleum production after being subjected to sphericity improvement.
Example 3
Firstly, 10kg of shale gas-oil-based drilling cutting solid waste is placed in a reaction vessel, wherein the solid phase content of the oil-based drilling cutting solid waste is 76%, the water content is 7%, the oil (diesel oil) content is 14%, the main components of the solid phase are Ba, si, S, fe, zn and the like, and the NaCl content is about 1.5%.
The method for treating shale gas oil-based drilling cutting solid waste comprises the following steps:
(1) Oil-water solid waste layering: adding water into the solid waste of the oil-based drilling cuttings, covering the surface layer of the solid waste with the water, fully stirring the solid waste and the water to fully mix the solid waste and the water to form a slurry mixture, and then adding a seaweed organic polymer separating agent, wherein the seaweed organic polymer separating agent is prepared by the following method: stirring and crushing deep sea seaweed, adding 3% by mass of sulfuric acid for acidification, adding 35% by mass of sodium hydroxide for leaching, filtering, and adding 30% of deionized water to obtain the seaweed organic polymer separating agent, wherein the pH value of the seaweed organic polymer separating agent is 6-9, the adding amount of the seaweed organic polymer separating agent is 3% of the total volume of the oil-based drilling cutting solid waste to be treated and water, stirring by using an electric stirrer for 45min, stopping stirring, standing for 90min, stirring again for 45min, stopping stirring, standing in a container for 24h, carrying out separation reaction, forming obvious different layers in the container at the moment, wherein the top layer is oil, the middle layer is water, and the bottom layer is solid waste;
(2) Oil recovery: slowly pumping an oil layer and a water layer to an oil-water mixing processor, sending the bottom solid waste to a solid waste processor, standing the oil-water mixture in a container for 90min, separating oil and water in the oil-water mixture by using an oil-water separator, sending the oil into a recovered oil storage container, sending the water into a waste water temporary storage container, and sending the water in the temporary storage container into the solid waste processor;
(3) Solid waste treatment: adding a small amount of clear water into a mixture of residual water and solid waste in a solid waste processor, covering the surface layer of the solid waste by the water, adding 35% citric acid and a seaweed organic polymer oxidant, stirring for 15min, standing for 60min, and carrying out a high-grade oxidation reaction, wherein the adding amount of the citric acid is 40% of the total volume of the mixture of the solid waste and the residual water, and the adding amount of the seaweed organic polymer oxidant is 5% of the total volume of the mixture of the solid waste and the residual water, and the seaweed organic polymer oxidant is prepared by the following method: stirring and crushing deep sea seaweed, adding 35% by mass of sulfuric acid for acidification reaction, adding 35% by mass of sodium hydroxide for leaching and filtering to obtain the seaweed organic polymer oxidant, wherein the pH value of the seaweed organic polymer oxidant is 10.5-11.5, performing high-grade oxidation reaction, performing centrifugal dehydration, feeding water into a temporary waste water storage container, conveying solid waste into a solid waste storage container, and standing for 30 days;
(4) Resource utilization: separating mud and sand in the solid waste after the reaction in the step (3), separating out sand grains, adding a seaweed organic polymer curing agent, wherein the volume of the seaweed organic polymer curing agent is 10 percent of the total volume of the sand grains, and the seaweed organic polymer curing agent is prepared by the following method: stirring and crushing deep sea seaweed, adding dilute sulfuric acid with the mass fraction of 3% for an acidification reaction, adding sodium hydroxide with the mass fraction of 3% for leaching and filtering, and adding 20% of organic silicon to obtain the modified sand grains, wherein the pH value of the seaweed organic polymer curing agent is 6-9, and the modified sand grains are prepared into fracturing sand for petroleum production.
Through detection, the proportion of the recovered oil is about 73% of the oil content of the shale gas-oil-based drilling cuttings. And (3) detecting after the treated solid waste is stood for 30 days, wherein the oil content is lower than 0.3%. The wastewater can be recycled after being purified in a temporary storage container. The sand grains separated from the solid waste have good lubricity, good temperature resistance and good corrosion resistance, and have basic conditions for fracturing sand for petroleum production after being subjected to sphericity improvement.
Example 4
10kg of shale gas oil-based drilling cutting solid waste is placed in a reaction vessel, wherein the solid phase content of the oil-based drilling cutting solid waste is 86%, the water content is 4%, the oil content is less than 8%, and the main components of the solid phase comprise Ba, si, S, fe, zn and the like. The solid waste has non-uniform particle size and low sand content, and is in a clay state.
The treatment method of the shale gas oil-based drilling cutting solid waste of the embodiment specifically comprises the following steps:
(1) Oil-water solid waste layering: adding water into the oil-based drilling cutting solid waste, covering the surface layer of the solid waste with the water, fully stirring the solid waste and the water to fully mix the solid waste and the water to form a slurry mixture, and then adding a seaweed organic polymer separating agent, wherein the seaweed organic polymer separating agent is prepared by the following method: stirring and crushing deep sea algae, adding 3% by mass of sulfuric acid for acidification, adding 35% by mass of sodium hydroxide for leaching, filtering, and adding 30% of deionized water to obtain the algae organic polymer separating agent, wherein the pH value of the algae organic polymer separating agent is 6-9, the adding amount of the algae organic polymer separating agent is 3% of the total volume of the oil-based drilling cutting solid waste to be treated and water, stirring is stopped by using an electric stirrer for 45min, standing is carried out for 90min, and the solid waste and the water form primary layering, but the water layer is turbid, and the oil layer is not formed. Adding water again, wherein the water adding amount is the same as the volume of the solid waste, adding a seaweed organic polymer separating agent, the adding amount is 2% of the total volume of the treated solid waste and the water, stirring for 45min, stopping stirring, standing for 90min, obviously layering a solid waste layer and an oil-water mixing layer, adding a seaweed organic polymer separating agent, the adding amount is 1% of the total volume of the solid waste and the water, stirring for 15min, standing for 24h in a container, carrying out separation reaction, and forming obvious different layers in the container at the moment, wherein the top layer is oil, the middle layer is water, and the bottom layer is the solid waste;
(2) Oil recovery: slowly pumping an oil layer and a water layer to an oil-water mixing processor, sending the bottom solid waste to a solid waste processor, standing the oil-water mixture in a container for 90min, separating oil and water in the oil-water mixture by using an oil-water separator, sending the oil into a recovered oil storage container, sending the water into a waste water temporary storage container, and sending the water in the temporary storage container into the solid waste processor;
(3) Solid waste treatment: adding a small amount of clear water into a mixture of residual water and solid waste in a solid waste processor, covering the surface layer of the solid waste with the water, adding oxalic acid with the concentration of 35% and a seaweed organic polymer oxidant, stirring for 15min, standing for 60min, and carrying out advanced oxidation reaction, wherein the adding amount of the oxalic acid is 40% of the total volume of the mixture of the solid waste and the residual water, the adding amount of the seaweed organic polymer oxidant is 5% of the total volume of the mixture of the solid waste and the residual water, and the seaweed organic polymer oxidant is prepared by the following method: stirring and crushing deep sea seaweed, adding 35% by mass of sulfuric acid for acidification reaction, adding 35% by mass of sodium hydroxide for leaching and filtering to obtain the seaweed organic polymer oxidant, wherein the pH value of the seaweed organic polymer oxidant is 10.5-11.5, performing high-grade oxidation reaction, performing centrifugal dehydration, allowing water to enter a temporary waste water storage container, conveying solid waste to a solid waste storage container, and standing for 30 days. And sampling, detecting and analyzing, wherein the oil content of the solid waste is reduced to 0.3 percent, and the set target is achieved.
Because the solid waste has low sand grain proportion, the sand grain separation and the sand grain processing into the fracturing sand have no economic value, and therefore, the resource utilization step is not implemented.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (12)
1. A method for treating shale gas oil-based drilling cutting solid waste is characterized by comprising the following steps:
(1) Oil-water solid waste layering: adding water into the oil-based drilling cutting solid waste, then adding the seaweed organic polymer separating agent, stirring, standing, performing separation reaction to form different layers of oil water and solid waste, and repeatedly adding the seaweed organic polymer separating agent for performing separation reaction according to the content of components in the treated solid waste until the oil water and the solid waste are obviously layered;
(2) Oil recovery: pumping the oil-water layer into an oil-water mixture storage container, standing for 60-90min, and separating oil from water after stabilization so as to recover oil;
(3) Solid waste treatment: after the step (2) is finished, discharging the mixture of the solid waste and the residual water in the step (1) into a solid waste treatment container, adding hydrogen peroxide or organic acid and seaweed organic polymer oxidant, carrying out advanced oxidation reaction, then carrying out dehydration treatment, detecting the content of components in the solid waste, judging whether the hydrogen peroxide or the organic acid and the seaweed organic polymer oxidant are repeatedly added according to the content until the detection meets the standard, sending the obtained solid waste into a storage yard for standing reaction, and standing reaction for not less than 28 days;
(4) Resource utilization: separating mud and sand in the solid waste after the reaction in the step (3), separating out sand grains, adding a seaweed organic polymer curing agent for reaction to obtain modified sand grains, and preparing the modified sand grains into fracturing sand for petroleum production;
wherein the seaweed organic polymer separating agent in the step (1) is prepared by the following method: stirring and crushing the deep sea seaweed, adding 3% of sulfuric acid by mass percent for acidification, adding 35% of sodium hydroxide by mass percent for leaching, filtering, and adding 30% of deionized water to obtain the seaweed organic polymer separating agent.
2. The method for treating shale gas-oil based drill cuttings solid waste according to claim 1, wherein the amount of the seaweed organic polymer separating agent added in step (1) is 1-3% of the total volume of the treated oil based drill cuttings solid waste and water.
3. The method for treating shale gas-oil based drill cutting solid waste according to claim 2, wherein the stirring time is 30-45min, and the standing time is 60-90min.
4. The method for treating shale gas oil based drill cuttings solid waste according to claim 3, wherein the pH value of the seaweed organic polymer separating agent is 6-9.
5. The method for treating the shale gas-oil-based drilling cutting solid waste according to any one of claims 1 to 4, wherein the oil-water separation in the step (2) is performed by using an oil-water separator to realize oil recovery, or clear water is added into an oil-water layer to raise the water level so that an oil layer naturally overflows and discharges to realize oil recovery.
6. The method for treating shale gas-oil based drill cuttings solid waste according to claim 1, wherein the amount of hydrogen peroxide or organic acid added in step (3) is 10-40% of the total volume of the solid waste and residual water mixture, and the amount of seaweed organic polymer oxidant added is 1-5% of the total volume of the solid waste and residual water mixture.
7. The method for treating shale gas oil based drill cuttings solid waste of claim 1, wherein the organic acid is citric acid or oxalic acid.
8. The method for treating shale gas oil-based drill cuttings solid waste according to claim 1, wherein the seaweed organic polymer oxidizer is prepared by the following method: stirring and crushing the deep sea seaweed, adding 35% by mass of sulfuric acid for acidification reaction, adding 35% by mass of sodium hydroxide for leaching and filtering to obtain the seaweed organic polymer oxidant.
9. The method for treating shale gas oil based drill cuttings solid waste of claim 8, wherein the pH of the seaweed organic polymer oxidizer is 10.5-11.5.
10. The method for treating shale gas oil-based drill cuttings solid waste according to claim 1, wherein the seaweed organic polymer curing agent in step (4) is prepared by the following method: stirring and crushing the deep sea seaweed, adding dilute sulfuric acid with the mass fraction of 3% for acidification reaction, adding sodium hydroxide with the mass fraction of 3% for leaching and filtering, and adding 1-20% of organic silicon to obtain the seaweed organic polymer curing agent.
11. The method for treating shale gas oil based drill cuttings solid waste of claim 10, wherein the seaweed organic polymer curing agent has a pH of 6 to 9.
12. The method for treating shale gas oil based drill cuttings solid waste of claim 10, wherein the volume of the seaweed organic polymer curing agent is 2-10% of the total volume of the sand grains.
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