Efficient and energy-saving oil-based rock debris deoiling cleaning agent recovery device and recovery method

Abstract

The invention relates to the technical field of deoiling cleaning agent recovery, in particular to a high-efficiency and energy-saving oil-based rock debris deoiling cleaning agent recovery device and a high-efficiency and energy-saving oil-based rock debris deoiling cleaning agent recovery method. Comprising a cleaning reaction device, the cleaning reaction device is connected with a solid-liquid separation device, the solid-liquid separation device is connected with a drying device and a recovery device, the recovery device comprises a distillation cylinder, a condenser and an evaporator are arranged on the outer side of the distillation cylinder, and the distillation cylinder is connected with the condenser and the evaporator through connecting pipes. The evaporator and the condenser are connected through a circulating pipeline. High-pressure refrigerant saturated liquid is changed into low-temperature and low-pressure saturated refrigerant through the throttling valve, the low-temperature and low-pressure saturated refrigerant absorbs latent heat in cleaning agent steam in the condenser to be changed into low-temperature saturated refrigerant steam, then the low-temperature saturated refrigerant steam enters the compressor for compression, temperature increasing and enthalpy increasing, then enters the evaporator for heat release, and is condensed into high-pressure refrigerant saturated liquid after heat release; after entering the throttling valve for throttling, heat absorption and evaporation are continued. The whole process is closed circulation, cold and heat sources are utilized in two directions, and the purpose of high energy conservation is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of de-oiling cleaning agent recovery, and in particular to a highly efficient and energy-saving oil-based rock cuttings de-oiling cleaning agent recovery device and a recovery method. Background Art

[0002] The shale gas drilling process will produce a large amount of drilling cuttings, and the drilling cuttings are mainly divided into two categories: water-based cuttings and oil-based cuttings. Waste oil-based drilling fluid and its cuttings have been included in the "National List of Hazardous Wastes" (2021), and their treatment and disposal are managed in accordance with hazardous waste. On the premise of ensuring that regional environmental risks are controllable, the Ministry of Ecology and Environment formulated the "Guidelines for the Management of Hazardous Wastes in the Onshore Oil and Gas Extraction Industry" in 2021. The guidelines propose that waste-producing units can use and dispose of oil-based cuttings on their own. The current more mature and industrially applied method for treating oil-based cuttings is mainly thermal desorption treatment.

[0003] However, thermal desorption of oil-based cuttings has problems such as high energy consumption and low economic value of recovered base oil, which seriously restricts the on-site promotion of this technology. Compared with thermal desorption treatment technology, the use of chemical extraction technology to treat oil-based cuttings has relatively low energy consumption, and because the cuttings treatment process is carried out at low temperature, it effectively avoids the generation of odors such as thioguanidine and thiophene sulfides during base oil recovery, and is increasingly attracting the attention of oil and gas development and environmental protection management companies.

[0004] The existing oil-based rock cuttings extraction and processing device mainly consists of four parts: a reaction device, a solid-liquid separation device, a rock cuttings drying device, and a cleaning agent recovery device. Among them, the cleaning agent recovery device requires a certain amount of thermal energy to separate the base oil-based mud from the cleaning agent. The traditional method is to use a boiler to prepare steam to heat the mixed liquid of the cleaning agent and the base oil-based mud to separate the cleaning agent from the base oil-based mud. However, this method has problems such as high energy consumption, high carbon emissions, and large cooling water usage, which directly leads to the high cost of unilateral treatment of oil-based rock cuttings using this method. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide an efficient and energy-saving oil-based rock cuttings deoiling cleaning agent recovery device and recovery method, which are used to reduce energy consumption and reduce costs when recovering the cleaning agent.

[0006] The technical solution adopted by the present invention to solve its technical problems is a high-efficiency and energy-saving oil-based rock cuttings deoiling cleaning agent recovery device, including a cleaning reaction device, the cleaning reaction device is connected to a solid-liquid separation device, the solid-liquid separation device is respectively connected to a drying device and a recovery device, the recovery device includes a distillation cylinder, a condenser and an evaporator are arranged on the outside of the distillation cylinder, the distillation cylinder is connected to the condenser through a first connecting pipe, a liquid storage tank is arranged at the end of the first connecting pipe, the distillation cylinder is connected to the evaporator through a second connecting pipe, the evaporator and the condenser are connected through a circulation pipe, the circulation pipe connects the condenser and the evaporator in series to form a circulation loop, and a throttle valve and a compressor are arranged on the circulation pipe.

[0007] Furthermore, the solid-liquid separation device includes a negative pressure vibrating screen and / or a high-speed centrifuge.

[0008] Furthermore, it also includes a conveying mechanism, which is used to convey the oil-based rock cuttings to the cleaning reaction device.

[0009] Furthermore, the conveying mechanism includes a screw conveyor or a belt conveyor.

[0010] Furthermore, a heating device is provided in the distillation cylinder.

[0011] Furthermore, a mud drainage hole is provided below the distillation cylinder.

[0012] A highly efficient and energy-saving oil-based rock cuttings deoiling cleaning agent recovery method, including a highly efficient and energy-saving oil-based rock cuttings deoiling cleaning agent recovery device, comprising the following steps:

[0013] S1: The oil-based rock cuttings produced by the well team's solid control system are input into the cleaning reaction device;

[0014] S2: pour the cleaning agent into the cleaning reaction device and fully stir it with the oil-based rock cuttings until the oil-based rock cuttings are completely cleaned;

[0015] S3: transporting the solid-liquid mixture in the cleaning reaction device to a solid-liquid separation device for solid-liquid separation, wherein the separated solid phase enters a drying device, and the liquid enters a distillation cylinder of a distillation recovery device;

[0016] S4: The distillation cylinder preheats the liquid to change the cleaning agent in the liquid phase into a vapor state. The cleaning agent vapor contacts the condenser through the first connecting pipe. A saturated refrigerant is arranged in the circulation pipeline. The saturated refrigerant absorbs the latent heat in the cleaning agent vapor in the condenser to become a saturated refrigerant vapor. The saturated refrigerant vapor enters the compressor for compression, temperature increase, and enthalpy increase, and then enters the working medium evaporator. The liquid in the second connecting pipe exchanges heat with the saturated refrigerant vapor under the action of the evaporator, so that the temperature of the liquid in the distillation cylinder is increased. At the same time, the saturated refrigerant vapor after releasing heat is condensed into a refrigerant saturated liquid and leaves. After entering the throttle valve, it continues to enter the condenser to absorb heat and evaporate;

[0017] S5: After the cleaning agent is recovered, the remaining liquid in the distillation cylinder is transferred to the base oil recovery tank for storage through a pump. After passing the test, it is regularly transported to the mud company for the configuration of oil-based drilling fluid.

[0018] Furthermore, in step S2, the stirring time of the oil-based cuttings and the cleaning agent is 10 to 60 minutes.

[0019] Furthermore, in step S2, when the cleaning agent and the oil-based cuttings are stirred, the temperature is 20-50° C. and the heating time is 10-60 min.

[0020] Further, in step S4, when the cleaning agent is distilled and recovered by the distillation cylinder, the distillation temperature is 90-110°C.

[0021] The beneficial effects of the present invention are as follows: a condenser and an evaporator are arranged outside the distillation cylinder, a high-pressure refrigerant saturated liquid is converted into a low-temperature and low-pressure saturated refrigerant through a throttle valve, and the latent heat in the cleaning agent vapor is absorbed in the condenser to become a low-temperature saturated refrigerant vapor, and then enters the compressor for compression, temperature increase, and enthalpy increase, and then enters the evaporator to release heat, and after heat release, it is condensed into a high-pressure refrigerant saturated liquid, and enters the throttle valve for throttling and continues to absorb heat and evaporate. The whole process is a closed cycle, and the cold and heat sources are used in both directions, and the latent heat in the cleaning agent vapor can be reused, reducing energy loss, thereby achieving the purpose of high energy saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the present invention;

[0023] Figure 2 yes Figure 1 Cross-sectional view of the distillation cylinder.

[0024] Figure numerals: 1-cleaning reaction device; 101-conveying mechanism; 2-solid-liquid separation device; 3-drying device; 4-recovery device; 5-distillation cylinder; 501-first connecting pipe; 502-second connecting pipe; 503-steam heating device; 504-mud drainage hole; 6-condenser; 7-evaporator; 8-liquid storage tank; 9-circulation pipeline; 901-throttle valve; 902-compressor. DETAILED DESCRIPTION

[0025] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0026] like Figure 1 As shown, the present invention is a highly efficient and energy-saving oil-based rock cuttings deoiling cleaning agent recovery device, including a cleaning reaction device 1, the cleaning reaction device 1 is connected to a solid-liquid separation device 2, the solid-liquid separation device 2 is respectively connected to a drying device 3 and a recovery device 4, the recovery device 4 includes a distillation cylinder 5, a condenser 6 and an evaporator 7 are arranged on the outside of the distillation cylinder 5, the distillation cylinder 5 is connected to the condenser 6 through a first connecting pipe 501, a liquid storage tank 8 is arranged at the end of the first connecting pipe 501, the distillation cylinder 5 is connected to the evaporator 7 through a second connecting pipe 502, the evaporator 7 and the condenser 6 are connected through a circulation pipe 9, the circulation pipe 9 connects the condenser 6 and the evaporator 7 in series to form a circulation loop, and a throttle valve 901 and a compressor 902 are arranged on the circulation pipe 9.

[0027] Among them, the cleaning reaction device 1 is a cylindrical structure, which is used to mix the oil-based rock cuttings and the cleaning agent. After the oil-based rock cuttings and the cleaning agent are fully mixed, the mixed liquid of the oil-based rock cuttings and the cleaning agent is poured into the solid-liquid separation device 2 for solid-liquid separation. The solid-liquid separation device 2 can use a grid with holes on the grid. When the oil-based rock cuttings and the cleaning agent mixed liquid is poured on the grid, the large particles of the solid phase remain on the grid, and the liquid phase flows out from the holes; the liquid phase and the solid phase are collected separately, and the cleaning agent mainly exists in the liquid phase. The solid phase is poured into the drying device 3 for drying, and the drying device 3 can use a dryer. The liquid phase is poured into the recovery device 4, which is used to recover the cleaning agent in the liquid phase; the recovery device 4 includes a distillation cylinder 5, which is used to convert the cleaning agent in the liquid phase into a gaseous state, and the gaseous cleaning agent contacts the condenser 6 through the first connecting pipe 501; a saturated refrigerant is arranged in the circulation pipeline 9, and the saturated refrigerant absorbs the latent heat in the cleaning agent vapor in the condenser 6 to become a saturated refrigerant vapor, at which time the gaseous cleaning agent becomes a liquid, and the liquid cleaning agent is discharged into the liquid storage tank 8 for storage, which is convenient for subsequent use; at the same time, the saturated refrigerant vapor enters the compressor 902 for compression, temperature increase, and enthalpy increase, and then enters the working medium Evaporator 7; the liquid phase in the distillation cylinder 5 will enter the second connecting pipe 502, where a delivery pump can be set on the second connecting pipe 502 to pump the liquid phase in the distillation cylinder 5 to the evaporator 7. The liquid phase in the second connecting pipe 502 exchanges heat with the saturated refrigerant vapor under the action of the evaporator 7, and then flows into the distillation cylinder 5, so that the temperature of the liquid phase in the distillation cylinder 5 increases. At the same time, the saturated refrigerant vapor after heat release condenses into a saturated refrigerant liquid and leaves. After entering the throttle valve 901, it continues to enter the condenser 6 to absorb heat and evaporate; after the cleaning agent in the liquid phase is recovered, the remaining liquid phase in the distillation cylinder 5 is discharged.

[0028] In order to better separate the oil-based rock cuttings and the cleaning agent mixture, the solid-liquid separation device 2 further includes a negative pressure vibrating screen and / or a high-speed centrifuge. The oil-based rock cuttings and the cleaning agent mixture are firstly separated by the negative pressure vibrating screen to separate the larger solid phase, and then finely separated by the high-speed centrifuge.

[0029] The high-speed centrifuge can be a GT10-1 high-speed desktop centrifuge, wherein the rotation speed of the high-speed centrifuge is greater than or equal to 10000r / min, the rotation speed is extremely high, and the centrifugal force generated is extremely large, which can better separate the oil-based cuttings and the cleaning agent mixture.

[0030] For further information, see Figure 1 , further comprising a conveying mechanism 101, wherein the conveying mechanism 101 is used to convey the oil-based rock cuttings to the cleaning reaction device 1. The conveying mechanism 101 can be a screw conveyor or a belt conveyor.

[0031] In order to facilitate heating of the liquid phase in the distillation cylinder 5, further, see Figure 2 The distillation cylinder 5 is provided with a heating device 503, and the heating device 503 can be heated by steam or mechanical energy.

[0032] After the cleaning agent in the distillation cylinder 5 is recovered, the remaining substance in the distillation cylinder 5 is mud, and the remaining mud needs to be discharged. In order to more conveniently discharge the mud in the distillation cylinder 5, further, Figure 2 A mud drainage hole 504 is provided below the distillation cylinder 5. The mud drainage hole 504 is communicated with the inner cavity of the distillation cylinder 5. When the cleaning agent in the distillation cylinder 5 is recovered, the mud drainage hole 504 needs to be blocked by a plug or other equipment.

[0033] A highly efficient and energy-saving oil-based rock cuttings deoiling cleaning agent recovery method, including a highly efficient and energy-saving oil-based rock cuttings deoiling cleaning agent recovery device, comprising the following steps:

[0034] S1: The oil-based rock cuttings generated by the well team solid control system are input into the cleaning reaction device 1;

[0035] S2: pouring a cleaning agent into the cleaning reaction device 1 and fully stirring it with the oil-based rock cuttings until the oil-based rock cuttings are completely cleaned;

[0036] S3: transporting the solid-liquid mixture in the cleaning reaction device 1 to the solid-liquid separation device 2 for solid-liquid separation, the separated solid phase enters the drying device 3, and the liquid enters the distillation cylinder 5 of the distillation recovery device 4;

[0037] S4: the distillation cylinder 5 preheats the liquid so that the cleaning agent in the liquid phase changes into a vapor state. The cleaning agent vapor contacts the condenser 6 through the first connecting pipe 501. A saturated refrigerant is arranged in the circulation pipe 9. The saturated refrigerant absorbs the latent heat in the cleaning agent vapor in the condenser 6 and turns into saturated refrigerant vapor. The saturated refrigerant vapor enters the compressor 902 for compression, temperature increase, and enthalpy increase, and then enters the working medium evaporator 7. The liquid in the second connecting pipe 502 exchanges heat with the saturated refrigerant vapor under the action of the evaporator 7, so that the temperature of the liquid in the distillation cylinder 5 increases. At the same time, the saturated refrigerant vapor after releasing heat condenses into a refrigerant saturated liquid and leaves. After entering the throttle valve 901, it continues to enter the condenser 6 to absorb heat and evaporate.

[0038] S5: After the cleaning agent is recovered, the remaining liquid in the distillation cylinder 5 is transferred to the base oil recovery tank for storage through a pump. After passing the test, it is regularly transported to the mud company for the preparation of oil-based drilling fluid.

[0039] Among them, in step S1, for areas with complex geological conditions, oil-based drilling fluid is used during drilling operations, so that the rock cuttings generated after drilling are oil-based rock cuttings. The oil-based rock cuttings can be input into the cleaning reaction device 1 manually or by machine.

[0040] In step S2, the cleaning agent mainly uses organic compounds such as alkanes or alcohols, and the oil-based drilling fluid in the oil-based cuttings is cleaned out by the principle of like dissolves like, that is, the oil-based drilling fluid is integrated into the cleaning agent. In order to fully blend, the oil-based cuttings and cleaning agent mixture in the cleaning reaction device 1 will be stirred during use, and the stirring method can be manual or with a mixer.

[0041] In step S4, the high-pressure refrigerant saturated liquid passes through the throttle valve 901, absorbs the latent heat in the cleaning agent vapor, becomes low-temperature saturated refrigerant vapor, and leaves. After entering the compressor 902 for compression, temperature increase, and enthalpy increase, it enters the evaporator 7 to release heat, and after releasing heat, it condenses into a high-pressure refrigerant saturated liquid, and continues to absorb heat and evaporate after entering the throttle valve 901. The whole process is a closed cycle, and the cold and heat sources are used in both directions, thereby achieving the purpose of high energy saving.

[0042] Further, in step S2, the stirring time of the oil-based rock cuttings and the cleaning agent is 10 to 60 minutes. The stirring device is first used to stir the oil-based rock cuttings at a speed of 800r / min to 1000r / min, and the stirring time is maintained at 5min to 30min to achieve a homogenizing effect, provide a stable rock cutting slurry for the process operation, and keep the temperature at 20 to 50°C; then the speed is reduced to 300r / min to 500r / min, and the stirring time is maintained at 5min to 30min, so that the slurry is fully homogenized and the effect of cleaning and degreasing the rock cuttings is achieved.

[0043] Furthermore, in step S2, when the cleaning agent is stirred with the oil-based rock cuttings, the temperature is 20-50°C and the heating time is 10-60 minutes. After subsequent drying treatment, the oil content in the oil-based rock cuttings can be reduced to below 0.3%, which is far lower than the requirements of the Technical Specifications for Pollution Control of Waste Mineral Oil Recycling (HJ607-2011).

[0044] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An efficient and energy-saving oil-based rock cuttings deoiling cleaning agent recovery device, comprising a cleaning reaction device (1), wherein the cleaning reaction device (1) is connected to a solid-liquid separation device (2), wherein the solid-liquid separation device (2) is respectively connected to a drying device (3) and a recovery device (4), characterized in that: The recovery device (4) comprises a distillation cylinder (5), a condenser (6) and an evaporator (7) are arranged on the outside of the distillation cylinder (5), the distillation cylinder (5) is connected to the condenser (6) via a first connecting pipe (501), a liquid storage tank (8) is arranged at the end of the first connecting pipe (501), the distillation cylinder (5) is connected to the evaporator (7) via a second connecting pipe (502), the evaporator (7) and the condenser (6) are connected via a circulation pipe (9), the circulation pipe (9) connects the condenser (6) and the evaporator (7) in series to form a circulation loop, and a throttle valve (901) and a compressor (902) are arranged on the circulation pipe (9).

2. A highly efficient and energy-saving oil-based rock cuttings deoiling cleaning agent recovery device as claimed in claim 1, characterized in that: The solid-liquid separation device (2) comprises a negative pressure vibrating screen and / or a high-speed centrifuge.

3. The high-efficiency and energy-saving oil-based rock cuttings deoiling cleaning agent recovery device according to claim 1, characterized in that: It also comprises a conveying mechanism (101), wherein the conveying mechanism (101) is used to convey the oil-based rock cuttings to the cleaning reaction device (1).

4. A highly efficient and energy-saving oil-based rock cuttings deoiling cleaning agent recovery device as claimed in claim 3, characterized in that: The conveying mechanism (101) comprises a screw conveyor or a belt conveyor.

5. The high-efficiency and energy-saving oil-based rock cuttings deoiling cleaning agent recovery device according to claim 1, characterized in that: A heating device (503) is provided in the distillation cylinder (5).

6. The high-efficiency and energy-saving oil-based rock cuttings deoiling cleaning agent recovery device according to claim 1, characterized in that: A mud drainage hole (504) is provided below the distillation cylinder (5).

7. A highly efficient and energy-saving method for recovering an oil-based rock cutting deoiling cleaning agent, comprising a highly efficient and energy-saving oil-based rock cutting deoiling cleaning agent recovery device as claimed in any one of claims 1 to 6, characterized in that: The steps include: S1: The oil-based rock cuttings generated by the well team's solids control system are input into the cleaning reaction device (1); S2: pouring a cleaning agent into the cleaning reaction device (1) and fully stirring the cleaning agent with the oil-based rock cuttings until the cleaning of the oil-based rock cuttings is completed; S3: transporting the solid-liquid mixture in the cleaning reaction device (1) to the solid-liquid separation device (2) for solid-liquid separation, the separated solid phase enters the drying device (3), and the liquid enters the distillation cylinder (5) of the distillation recovery device; S4: the distillation cylinder (5) preheats the liquid so that the cleaning agent in the liquid phase changes into a vapor state. The cleaning agent vapor contacts the condenser (6) through the first connecting pipe (501). A saturated refrigerant is arranged in the circulation pipe (9). The saturated refrigerant absorbs the latent heat in the cleaning agent vapor in the condenser (6) and becomes a saturated refrigerant vapor. The saturated refrigerant vapor enters the compressor (902) for compression, temperature increase, and enthalpy increase, and then enters the working medium evaporator (7). The liquid in the second connecting pipe (502) exchanges heat with the saturated refrigerant vapor under the action of the evaporator (7), so that the temperature of the liquid in the distillation cylinder (5) increases. At the same time, the saturated refrigerant vapor after releasing heat condenses into a refrigerant saturated liquid and leaves. After entering the throttle valve (901), it continues to enter the condenser (6) to absorb heat and evaporate. S5: After the cleaning agent is recovered, the remaining liquid in the distillation cylinder (5) is transferred to the base oil recovery tank for storage through a pump. After passing the test, it is regularly transported to the mud company for use in the preparation of oil-based drilling fluid.

8. A highly efficient and energy-saving method for recovering oil-based rock cuttings deoiling cleaning agent as claimed in claim 7, characterized in that: In step S2, the stirring time of the oil-based cuttings and the cleaning agent is 10 to 60 minutes.

9. A highly efficient and energy-saving oil-based rock cuttings deoiling cleaning agent recovery method as claimed in claim 7, characterized in that: In step S2, when the cleaning agent and the oil-based cuttings are stirred, the temperature is 20-50° C. and the heating time is 10-60 minutes.

10. A highly efficient and energy-saving method for recovering oil-based rock cuttings deoiling cleaning agent according to claim 7, characterized in that: In step S4, when the cleaning agent is distilled and recovered by the distillation cylinder, the distillation temperature is 90-110°C.

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