CN113651508B - Oil sludge sand treatment process technology for downhole operation - Google Patents
Oil sludge sand treatment process technology for downhole operation Download PDFInfo
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- CN113651508B CN113651508B CN202111212585.XA CN202111212585A CN113651508B CN 113651508 B CN113651508 B CN 113651508B CN 202111212585 A CN202111212585 A CN 202111212585A CN 113651508 B CN113651508 B CN 113651508B
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- oil
- sand
- oil sludge
- sludge sand
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/002—Sludge treatment using liquids immiscible with water
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
Abstract
The application discloses borehole operation oil sludge sand treatment process technology belongs to solid waste treatment technical field. The method comprises the following processing steps: screening the oil sludge sand, adding a cleaning agent into an oil sludge sand mixture with the particle size of less than 20mm, heating, stirring, centrifuging, and separating three phases; distilling crude oil twice under normal pressure and reduced pressure and then recovering; the cleaning agent comprises a compound surfactant, n-butanol and 1, 2-dichloroethane; the mass ratio of the three is (8-15): 1: (3-10); the compound surfactant is a compound of dodecyl sulfopropyl betaine and lauryl sodium sulfate, and the mass ratio of the dodecyl sulfopropyl betaine to the lauryl sodium sulfate is 1 (0.8-1.2). The treatment process can be used for simultaneously performing demulsification and extraction separation on the oil sludge sand, further separating oil, sludge and sand, and also can be used for effectively recovering crude oil in the oil sludge sand.
Description
Technical Field
The application relates to a technology for treating oil sludge sand in underground operation, belonging to the technical field of solid waste treatment.
Background
In the process of testing oil in underground operation, although the well site takes ground protection measures, oil-containing waste water, crude oil, oil-containing propping agent and the like inevitably fall into the soil of the well site due to blowout accidents, running, dripping and the like, and form oil-containing silt after mixing. The oil-bearing mud sand is solid waste comprising mineral oil, mineral matter, water, mud sand, etc. and has low water content, light emulsifying degree and oil content of 10-50%. Dissolved gas and light hydrocarbon substances in the oil sludge sand piled in the open air enter the atmosphere after being volatilized, so that the atmosphere pollution can be caused; after being showered by rainwater, the soil can be poisoned, acidified or alkalized; aromatic hydrocarbon and heavy metal ions in the fertilizer can cause crop and plant death and can also endanger human health through a food chain.
The oil-containing silt treatment meets the requirements of national and local method laws and regulations, which is a difficult problem to be solved urgently at present. The oil-containing sludge and oil sludge sand with the oil content of more than 5 percent are recycled; the oil content of the oil sludge sand after oil sand separation is less than 2%. Therefore, the oil-containing silt/sludge needs to be effectively and reasonably treated so as to meet the requirements of relevant regulations.
Disclosure of Invention
In order to solve the problems, the invention provides a technology for treating oil sludge sand in underground operation, which is characterized in that a cleaning agent is added into an oil sludge sand mixture, and the mixture is subjected to demulsification and extraction separation simultaneously, so that oil, sludge and sand are separated in three phases, and crude oil in the oil sludge sand can be effectively recovered.
The technical scheme adopted by the invention is as follows:
a process for treating oil sludge sand in downhole operation comprises the following treatment steps:
(1) screening the oil sludge sand to remove impurities with the particle size larger than 20 mm;
(2) crushing the impurities with the particle size of more than 20mm in the step (1) to obtain oil sludge sand with the particle size of less than 20 mm;
(3) adding a cleaning agent into the oil sludge-sand mixture with the particle size of less than 20mm in the steps (1) and (2), heating, stirring and centrifuging to realize three-phase separation, wherein the upper layer is crude oil, the middle layer is a water phase and the lower layer is sludge;
(4) distilling the obtained crude oil twice under normal pressure and reduced pressure, and recycling;
wherein the cleaning agent comprises a compound surfactant, n-butanol and 1, 2-dichloroethane;
the mass ratio of the compound surfactant to n-butanol to 1, 2-dichloroethane is (8-15): 1: (3-10), preferably (10-14): 1: (5-8), more preferably 12: 1: 7;
the compound surfactant is a compound of dodecyl sulfopropyl betaine and lauryl sodium sulfate, and the mass ratio of the dodecyl sulfopropyl betaine to the lauryl sodium sulfate is 1 (0.8-1.2), preferably 1 (0.9-1.1), and more preferably 1: 1.
Preferably, the mass ratio of the oil sludge-sand mixture to the cleaning agent in the step (3) is (50-1000): 1, more preferably (300 to 800): 1, more preferably 500: 1.
preferably, the heating temperature in the step (3) is 50-70 ℃, more preferably 55-65 ℃, and more preferably 60 ℃; the stirring time is 20-80 min, more preferably 35-65 min, and more preferably 50 min; the stirring speed is 280-400 rpm, more preferably 310-370 rpm, and more preferably 340 rpm.
Preferably, the temperature of the atmospheric distillation in the step (4) is 100-400 ℃, and more preferably 250 ℃; the absolute pressure is 10 to 600Kpa, and more preferably 300 Kpa.
Preferably, the temperature of the reduced pressure distillation in the step (4) is 100-400 ℃, and more preferably 200 ℃; the absolute pressure is 10 to 60Kpa, and more preferably 35 Kpa.
Preferably, the oil sludge sand in the step (1) is put into a stirring kettle, hot water is added, stirring and washing are carried out, crude oil floating on the upper layer is recovered, and then the dried oil sludge sand mixture is placed in a sieving machine to remove impurities with the particle size of more than 20 mm.
Preferably, the temperature of the hot water is 70-85 ℃, and more preferably 80 ℃.
Preferably, the middle water phase in the step (3) and the hot water after washing in the step (1) are cooled and filtered, and the filtering mode is at least one of microfiltration, ultrafiltration, nanofiltration or reverse osmosis, and is more preferably reverse osmosis.
Preferably, the impurities with the particle size of more than 20mm in the step (2) are placed in a grinder to be ground until the particle size is less than 20mm, and the grinding efficiency is 50-80 kg/min, more preferably 65 kg/min; the grinding time is 1-2.5 h, and more preferably 1.8 h.
Preferably, the residual oil rate of the lower layer of the silt in the step (3) is less than 2%.
Benefits of the present application include, but are not limited to:
1. according to the underground operation oil sludge sand treatment process, impurity removal, crushing, phase splitting and distillation processes are sequentially carried out on oil sludge sand, effective separation of oil, sludge and sand is guaranteed, and meanwhile, the efficient recovery of crude oil in an oil sludge sand mixture is achieved. The addition of the n-butyl alcohol in the cleaning agent can be used as a solvent and a cosurfactant, and the n-butyl alcohol and the complex surfactant act synergistically to liquefy a rigid hydrocarbon area of an interface film and induce the interface film to become an ideal curvature, so that the flexibility of the interface is improved, the interface fluidity and the entropy value of a system are increased, and the oil and water are rapidly and thoroughly separated; the 1, 2-dichloroethane in the cleaning agent is used as a solvent and an extracting agent, and the demulsification and extraction processes have synergistic effect, so that the three-phase separation efficiency of oil, mud and sand is higher.
2. According to the compound surfactant, the dodecyl sulfopropyl betaine enters the dodecyl sodium sulfate molecules in an empty insertion mode, so that charge repulsion among the molecules is weakened, the formation of micelles is facilitated, the oil-water interfacial tension is reduced by compounding the dodecyl sulfopropyl betaine and the dodecyl sodium sulfate, the solubilization of the micelles on oil phases is promoted, and an important effect is achieved on the removal of crude oil in oil sludge sand.
3. According to the underground operation oil sludge treatment process, the distillation process can be used for recycling the crude oil obtained in each step after impurity removal, and the residual oil rate of the sludge is determined to be less than 2% after the treatment process is completed, so that the treatment process accords with relevant regulations. And the sewage in each step is collected, filtered and recycled, so that water resources are saved, and the environment is protected.
Detailed Description
The present application will be described in detail with reference to examples, but the present application is not limited to these examples.
The invention provides a treatment process of oil sludge sand for underground operation, which comprises the following treatment steps:
(1) screening the oil sludge sand, removing impurities with the particle size larger than 20mm, and specifically comprising: putting the oil sludge sand into a stirring kettle, adding hot water with the temperature of 80 ℃, stirring and washing, recovering the floating crude oil on the upper layer, and then putting the dried oil sludge sand mixture into a sieving machine to remove impurities with the particle size of more than 20 mm;
(2) putting the impurities with the particle size of more than 20mm obtained in the step (1) into a grinder for grinding, wherein the grinding efficiency is 65kg/min, and the grinding time is 1.8h, so as to obtain oil sludge sand with the particle size of less than 20 mm;
(3) adding a cleaning agent into the oil sludge sand mixture with the particle size of less than 20mm in the steps (1) and (2), wherein the mass ratio of the oil sludge sand mixture to the cleaning agent is (50-1000): 1, heating and stirring at the temperature of 50-70 ℃, stirring for 20-80 min at the stirring speed of 280-400 rpm, centrifuging to realize three-phase separation, namely, crude oil at the upper layer, a water phase at the middle layer and silt at the lower layer;
(4) distilling the obtained crude oil twice under normal pressure and reduced pressure, and recycling, wherein the temperature of normal pressure distillation is 250 ℃, the absolute pressure is 300Kpa, the temperature of reduced pressure distillation is 200 ℃, and the absolute pressure is 35 Kpa;
wherein, the cleaning agent comprises a compound surfactant, n-butanol and 1, 2-dichloroethane;
the mass ratio of the compound surfactant to the n-butanol to the 1, 2-dichloroethane is (8-15): 1: (3-10);
the compound surfactant is a compound of dodecyl sulfopropyl betaine and lauryl sodium sulfate, and the mass ratio of the dodecyl sulfopropyl betaine to the lauryl sodium sulfate is 1 (0.8-1.2).
And (3) further, cooling the middle-layer water phase in the step (3) and the hot water washed in the step (1), and filtering for utilization, wherein the filtering mode is reverse osmosis.
Further, the residual oil rate of the lower layer of the silt in the step (3) is less than 2%.
The oil sludge sand is treated according to the treatment process of the oil sludge sand in the underground operation, and the test parameters of different embodiments different from the treatment process of the oil sludge sand in the underground operation are shown in the table 1.
TABLE 1 summary of treatment process parameters for downhole operations of oil sands
The oily sediment treated in examples 1 to 5 and comparative examples 1 to 17 in table 1 is oily sediment at the oil extraction site of a victory oil field, and the oily sediment has an oil content of 26.2%, a water content of 53.1% and a sand content of 20.7%. The oil removing rates of the oily sediment treated in examples 1 to 5 and comparative examples 1 to 17 are shown in Table 2.
TABLE 2 evaluation of treatment effect of oil-containing silt for downhole operation
Note: weighing a certain amount of oil-containing silt, placing the oil-containing silt into a dry Soxhlet extractor, adding petroleum ether, heating and refluxing for extraction at 80 ℃ for 12 hours, drying the extracted silt to constant weight, weighing the mass, wherein the mass difference between the oil-containing silt before and after extraction is the oil-containing mass m1 (g); the mass difference of the silt treated by the oil silt treatment process before and after extraction is oil-containing mass m2 (g); oil removal rate (%) = (m1-m2)/m1 × 100.
As can be seen from tables 1 and 2, the treatment process for the oil sludge sand in the underground operation can effectively separate the oil sludge sand from the oil sludge sand, and simultaneously, the crude oil in the oil sludge sand mixture is efficiently recovered; compared with the example 3, the addition of the cleaning agent is important for improving the separation efficiency of the oil sludge sand; compared with the embodiment 3, any component and content of the cleaning agent provide guarantee for efficient separation of oil, mud and sand in the comparative examples 10-17.
The above description is only an example of the present application, and the protection scope of the present application is not limited by these specific examples, but is defined by the claims of the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the technical idea and principle of the present application should be included in the protection scope of the present application.
Claims (7)
1. A treatment process for oil sludge sand in underground operation is characterized by comprising the following treatment steps:
(1) screening the oil sludge sand to remove impurities with the particle size larger than 20 mm;
(2) crushing the impurities with the particle size of more than 20mm in the step (1) to obtain oil sludge sand with the particle size of less than 20 mm;
(3) adding a cleaning agent into the oil sludge-sand mixture with the particle size of less than 20mm in the steps (1) and (2), heating, stirring and centrifuging to realize three-phase separation, wherein the upper layer is crude oil, the middle layer is a water phase and the lower layer is sludge;
(4) distilling the obtained crude oil twice under normal pressure and reduced pressure, and recycling;
wherein the cleaning agent comprises a compound surfactant, n-butanol and 1, 2-dichloroethane;
the mass ratio of the compound surfactant to n-butanol to 1, 2-dichloroethane is (8-15): 1: (3-10);
the compound surfactant is a compound of dodecyl sulfopropyl betaine and lauryl sodium sulfate, and the mass ratio of the dodecyl sulfopropyl betaine to the lauryl sodium sulfate is 1 (0.8-1.2);
the mass ratio of the oil-sludge-sand mixture to the cleaning agent in the step (3) is (50-1000): 1;
in the step (3), the heating temperature is 50-70 ℃, the stirring time is 20-80 min, and the stirring speed is 280-400 rpm;
the oil content of the oil sludge sand is 26.2 percent, the water content is 53.1 percent and the sand content is 20.7 percent;
and (4) the residual oil rate of the lower layer of the silt in the step (3) is less than 2%.
2. The process of claim 1, wherein the atmospheric distillation in the step (4) is performed at a temperature of 100 to 400 ℃ and an absolute pressure of 10 to 600 Kpa.
3. The process for treating oil sludge sand in a downhole operation according to claim 1, wherein the temperature of the reduced pressure distillation in the step (4) is 100 to 400 ℃ and the absolute pressure is 10 to 60 KPa.
4. The process of claim 1, wherein the oil-containing silt mixture obtained in step (1) is fed into a stirred tank, hot water is added, the stirred tank is washed, the crude oil floating on the upper layer is recovered, and the dried oil-containing silt mixture is placed in a sieving machine to remove impurities with a particle size of more than 20 mm.
5. The downhole operation oil sludge sand treatment process according to claim 4, wherein the temperature of the hot water is 70-85 ℃.
6. The downhole operation oil sludge sand treatment process according to claim 4, wherein the middle water phase in the step (3) and the hot water after washing in the step (1) are cooled and then filtered, and the filtering mode is at least one of microfiltration, ultrafiltration, nanofiltration or reverse osmosis.
7. The treatment process of the oil sludge sand in the downhole operation according to claim 1, wherein the impurities with the particle size of more than 20mm in the step (2) are crushed in a crusher until the particle size is less than 20mm, the crushing efficiency is 50-80 kg/min, and the crushing time is 1-2.5 h.
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| CN202111212585.XA CN113651508B (en) | 2021-10-19 | 2021-10-19 | Oil sludge sand treatment process technology for downhole operation |
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| CN202111212585.XA CN113651508B (en) | 2021-10-19 | 2021-10-19 | Oil sludge sand treatment process technology for downhole operation |
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Effective date of registration: 20230904 Address after: Inside Shandong Deshi Petroleum Engineering Group Co., Ltd., No. 29 Qilianshan Road, Dongying District, Dongying City, Shandong Province, 257000 yuan Patentee after: Shengli Oilfield Zhongyang Petroleum Engineering Co.,Ltd. Address before: 257000 building 18, college student Pioneer Park, Zoucheng Road, Dongying District, Dongying City, Shandong Province Patentee before: Deshi Energy Technology Group Co.,Ltd. Patentee before: SHANDONG DESHI PETROLEUM EQUIPMENT Co.,Ltd. Patentee before: SHANDONG DESHI CHEMICAL Co.,Ltd. |
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