Water-based drilling waste reinjection treatment system

Abstract

The utility model relates to the technical field of well drilling waste treatment, in particular to a water-based well drilling waste reinjection treatment system which comprises a waste collecting tank, a slurry mixing tank, a dispersing tank, a first vibrating screen, a circulating tank, a slurry preparing tank, a slurry storage tank and a reinjection pump set. The dispersing tank is also provided with a feeding hole; a fine particle outlet of the first vibrating screen is connected with a circulating tank, a coarse particle outlet of the first vibrating screen is connected with a grinding machine, a discharging port of the grinding machine is connected with the circulating tank, and the circulating tank is further connected with a feeding port of the first vibrating screen through a circulating pipe; and a liquid inlet is also formed in the slurry preparation tank. The treatment system has the advantages of high treatment efficiency, large treatment capacity, high injection efficiency, good safety and stability in the injection process and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of drilling waste treatment, in particular to a water-based drilling waste reinjection treatment system. Background Art

[0002] The most widely used drilling fluid in current oil drilling operations is water-based drilling fluid. The waste generated by drilling operations using water-based drilling fluid is called water-based drilling waste, which mainly includes waste water-based mud, water-based drilling cuttings, water for cleaning well site equipment, completion operation well washing wastewater, well site domestic sewage, etc. The main treatment methods for water-based drilling waste are: solid-liquid separation, solidification landfill, biodegradation, chemical treatment, reinjection, etc. Among them, the drilling waste reinjection method is to inject the drilling waste into a safe formation after treatment. This method can thoroughly treat drilling waste such as drill cuttings, waste mud, and wastewater, and will not discharge sewage and chemicals to the surface, and will not cause secondary pollution. It is a harmless solution for achieving permanent, zero-emission treatment of drilling waste, and is particularly suitable for environmentally sensitive areas with strict environmental protection requirements.

[0003] As oil drilling and development expands, extending into environmentally sensitive areas, traditional oilfield waste disposal methods are no longer sufficient to meet the requirements for harmless treatment. This severely restricts the large-scale, clean, and sustainable development of oilfields in these environmentally sensitive areas. As a method that effectively reduces impacts on the surface environment, drilling waste reinjection technology is increasingly being adopted.

[0004] In the prior art, a Chinese utility model patent document with publication number CN211342833U and publication date of August 25, 2020 is proposed to solve the above-mentioned technical problems. The technical solution disclosed in the patent document is as follows: a device for grinding drilling waste to produce reinjection mud, comprising a waste recovery tank, a grinding tank, a temporary storage box and a reinjection pump, the outlet of the waste recovery tank is connected to the grinding tank, the grinding tank is connected to a main water pipeline, the outlet of the temporary storage box is connected to the reinjection pump, and the grinding tank is connected to the main water pipeline. A first vibrating screen and a second crusher are provided between the temporary storage box. The solid and liquid wastes fed into the grinding jar are first fed into the first vibrating screen for screening. The wastes that cannot fall from the first vibrating screen are fed into the second crusher for crushing. The wastes that fall from the first vibrating screen are fed into the grinding jar for grinding. The solid waste ground from the grinding jar is screened together with the liquid waste through the second vibrating screen. The waste under the screen is fed into the temporary storage box, and the wastes that fail to pass the screen are fed into the second grinding jar for grinding.

[0005] In actual use, the above technical solution needs to be ground and screened multiple times, which may lead to problems such as low pretreatment efficiency, low processing volume, low injection efficiency, and poor safety and stability. Summary of the Invention

[0006] In order to solve the above technical problems, the utility model proposes a water-based drilling waste reinjection treatment system, which has the advantages of high treatment efficiency, large treatment capacity, high injection efficiency and good safety and stability of the injection process.

[0007] The utility model is realized by adopting the following technical solutions:

[0008] A water-based drilling waste reinjection treatment system comprises a waste collection tank, a slurry mixing tank, a dispersion tank, a first vibrating screen, a circulation tank, a slurry preparation tank, a slurry storage tank and a reinjection pump group connected in sequence; the dispersion tank is also provided with a feeding port; the fine particle outlet of the first vibrating screen is connected to the circulation tank, the coarse particle outlet of the first vibrating screen is connected to a grinder, the discharge port of the grinder is connected to the circulation tank, and the circulation tank is also connected to the feed port of the first vibrating screen via a circulation pipe; the slurry preparation tank is also provided with a liquid inlet.

[0009] The waste collection tank includes a rock cutting collection tank, a waste mud collection tank and a waste water collection tank.

[0010] It also includes a connected second vibrating screen and a crusher, the discharge port of the rock cuttings collection tank is connected to the feed port of the second vibrating screen, the coarse particle outlet of the second vibrating screen is connected to the crusher, and the fine particle outlet of the second vibrating screen and the discharge port of the crusher are respectively connected to the slurry mixing tank.

[0011] The second vibrating screen is connected to the discharge port of the cuttings collection tank via a screw conveyor.

[0012] The mesh number of the screen cloth in the first vibrating screen is greater than the mesh number of the screen cloth in the second vibrating screen.

[0013] The wastewater collection tank is also connected to the liquid inlet of the slurry mixing tank through a liquid inlet pipe, and a filter is provided on the liquid inlet pipe.

[0014] The slurry mixing tank is provided with a first agitator and a slurry gun.

[0015] A second agitator is provided in the dispersion tank.

[0016] A filtering device is also provided between the reinjection pump group and the slurry storage tank.

[0017] The slurry mixing tank is also provided with a drug adding port.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] 1. According to the structure of the present invention, the waste in the waste collection tank is passed into the slurry mixing tank to be fully mixed, and then enters the dispersion tank to further disperse the waste. The waste then passes through the first vibrating screen. The rock chips screened out by the first vibrating screen directly enter the grinder, and the screened slurry enters the circulation tank. The circulation tank then returns the solid-liquid mixed slurry to the first vibrating screen through the circulation pipe, so that the first vibrating screen, the grinder, and the circulation tank establish a small circulation. After the particles in the solid-liquid mixed slurry in the circulation tank meet the standards, it is transported to the slurry preparation tank through a pipeline for slurry preparation. The slurry in the slurry preparation tank is transported to the slurry storage tank through a pipeline for storage. The slurry storage tank is used to store the reinjection slurry. The reinjection pump group reinjects the reinjection slurry in the slurry storage tank into the reinjection well.

[0020] Through the above-mentioned treatment system, drilling waste is treated more thoroughly with high treatment efficiency, large treatment volume, high injection efficiency, and safe and stable injection process. It can achieve zero discharge of water-based drilling waste and meet the environmental protection requirements of drilling operations in environmentally sensitive areas.

[0021] 2. In the present invention, the waste collection tanks include a rock chip collection tank, a waste mud collection tank and a wastewater collection tank, which can realize the classified collection of various types of waste and perform corresponding pretreatment, thereby improving the treatment effect and efficiency.

[0022] 3. The setting of the second vibrating screen and the crusher can sort the rock chips in the rock chip collection tank and crush them accordingly, which has a good pretreatment effect on the rock chips.

[0023] 4. The second vibrating screen is connected to the discharge port of the cuttings collection tank through a screw conveyor, which has a good conveying effect.

[0024] 5. The wastewater collection tank is also connected to the liquid inlet of the slurry mixing tank through a liquid inlet pipe. A filter is provided on the liquid inlet pipe, so that the wastewater in the wastewater collection tank can pass through the filter to remove impurities and then enter the slurry mixing tank to adjust the solid-liquid ratio of the slurry, thereby making full use of the wastewater in the wastewater collection tank.

[0025] 6. The mixing tank is provided with a first agitator and a mud gun, so that the rock cuttings, waste water and waste mud can be fully mixed, thereby improving the mixing effect.

[0026] 7. The initial feeding can be completed in the dispersion tank. Since the dispersion tank is provided with a second agitator, the rock cuttings can be further dispersed, and the slurry in the dispersion tank has a certain suspension capacity.

[0027] 8. A filtering device is also provided between the reinjection pump group and the slurry storage tank to facilitate further filtering of the slurry and ensure the quality of the reinjection slurry that is finally reinjected into the reinjection well.

[0028] 9. The mesh number of the screen cloth in the first vibrating screen is greater than the mesh number of the screen cloth in the second vibrating screen, so that rough selection and fine selection can be completed in sequence, and the processing effect and efficiency of the entire system are better.

[0029] 10. The slurry mixing tank is also provided with a dosing port, which is convenient for adding chemical agents into the slurry mixing tank, so as to further adjust the performance of the solid-liquid mixed slurry after the particles in the slurry mixing tank meet the standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, wherein:

[0031] Figure 1 It is a structural diagram of the utility model;

[0032] Markings in the figure:

[0033] 1. Waste mud collection tank, 2. Wastewater collection tank, 3. Rock cuttings collection tank, 4. Second vibrating screen, 5. Crusher, 6. Slurry mixing tank, 7. Dispersion tank, 8. First vibrating screen, 9. Grinder, 10. Circulation tank, 11. Slurry mixing tank, 12. Filter, 13. Slurry storage tank, 14. Filter device, 15. Reinjection pump group. DETAILED DESCRIPTION

[0034] Example 1

[0035] As a basic embodiment of the present invention, the present invention includes a water-based drilling waste reinjection treatment system, which includes a waste collection tank, a slurry mixing tank 6, a dispersion tank 7, a first vibrating screen 8, a circulation tank 10, a slurry preparation tank 11, a slurry storage tank 13, and a reinjection pump group 15. The dispersion tank 7 is also provided with a feed port for adding chemicals to the dispersion tank 7 to ensure that the slurry in the dispersion tank 7 has a certain degree of suspension ability.

[0036] The fine particle outlet of the first vibrating screen 8 is connected to a circulation tank 10, and the coarse particle outlet of the first vibrating screen 8 is connected to a grinder 9. The discharge port of the grinder 9 is connected to the circulation tank 10, and the circulation tank 10 is also connected to the feed port of the first vibrating screen 8 via a circulation pipe. The rock chips screened by the first vibrating screen 8 directly enter the grinder 9, and the slurry screened by the first vibrating screen 8 enters the circulation tank 10. The circulation tank 10 returns the solid-liquid mixed slurry to the first vibrating screen 8 through a pipeline. The first vibrating screen 8, the grinder 9, and the circulation tank 10 establish a small circulation until the particles in the solid-liquid mixed slurry in the circulation tank 10 meet the standards, and then they are transported to the slurry preparation tank 11.

[0037] The slurry mixing tank 11 is also provided with a liquid inlet for adjusting the solid-liquid ratio.

[0038] Example 2

[0039] As a preferred embodiment of the present invention, the present invention includes a water-based drilling waste reinjection treatment system, including a waste collection tank, a slurry mixing tank 6, a dispersion tank 7, a first vibrating screen 8, a circulation tank 10, a slurry mixing tank 11, a slurry storage tank 13 and a reinjection pump group 15 connected in sequence.

[0040] The waste collection tanks include a rock cuttings collection tank 3, a waste mud collection tank 1, and a wastewater collection tank 2. The waste mud collection tank 1 and the wastewater collection tank 2 are each connected to a slurry mixing tank 6 via a pipeline. A second vibrating screen 4 and a crusher 5 are also connected between the rock cuttings collection tank 3 and the slurry mixing tank 6. The discharge port of the rock cuttings collection tank 3 is connected to the feed port of the second vibrating screen 4, the coarse particle outlet of the second vibrating screen 4 is connected to the crusher 5, and the fine particle outlet of the second vibrating screen 4 and the discharge port of the crusher 5 are each connected to the slurry mixing tank 6.

[0041] The dispersion tank 7 is also provided with a feeding port. The fine particle outlet of the first vibrating screen 8 is connected to the circulation tank 10. The coarse particle outlet of the first vibrating screen 8 is connected to the grinder 9. The discharge port of the grinder 9 is connected to the circulation tank 10. The circulation tank 10 is also connected to the feed port of the first vibrating screen 8 via a circulation pipe. The slurry preparation tank 11 is also provided with a liquid inlet.

[0042] Example 3

[0043] As another preferred embodiment of the present invention, the present invention includes a water-based drilling waste reinjection treatment system, comprising a waste collection tank, a slurry mixing tank 6, a dispersion tank 7, a first vibrating screen 8, a circulation tank 10, a slurry preparation tank 11, a slurry storage tank 13, a filter device 14, and a reinjection pump group 15, which are connected in sequence. The fine particle outlet of the first vibrating screen 8 is connected to the circulation tank 10, and the coarse particle outlet of the first vibrating screen 8 is connected to a grinder 9. The discharge port of the grinder 9 is connected to the circulation tank 10, and the circulation tank 10 is also connected to the feed port of the first vibrating screen 8 via a circulation pipe. The slurry preparation tank 11 is also provided with a liquid inlet.

[0044] Furthermore, a first agitator and a mud gun are provided in the mixing tank 6. A feeding port is also provided on the dispersion tank 7. A second agitator is provided in the dispersion tank 7.

[0045] Example 4

[0046] As the best embodiment of this utility model, refer to the attached Figure 1The utility model includes a water-based drilling waste reinjection treatment system, including a waste collection tank, a slurry mixing tank 6, a dispersion tank 7, a first vibrating screen 8, a circulation tank 10, a slurry mixing tank 11, a slurry storage tank 13, a filtering device 14 and a reinjection pump group 15 connected in sequence by pipelines.

[0047] The waste collection tank includes a rock chip collection tank 3, a waste mud collection tank 1 and a waste water collection tank 2. The waste mud collection tank 1 and the waste water collection tank 2 are respectively connected to the slurry mixing tank 6 through pipelines. A second vibrating screen 4 and a crusher 5 are also provided between the rock chip collection tank 3 and the slurry mixing tank 6. The discharge port of the rock chip collection tank 3 can be connected to the feed port of the second vibrating screen 4 through a screw conveyor, the coarse particle outlet of the second vibrating screen 4 is connected to the crusher 5, and the fine particle outlet of the second vibrating screen 4 and the discharge port of the crusher 5 are respectively connected to the slurry mixing tank 6. Among them, the second vibrating screen 4 can be arranged with three screen cloths with a mesh size of 20. The crusher 5 can be a double-roll crusher, and the particle size range of the double-roll crusher outlet is adjusted to 2-8mm.

[0048] A first agitator and a mud gun are provided in the mixing tank 6. The first agitator may be a high-speed agitator. Through the cooperation of the first agitator and the mud gun, the rock chips, wastewater and mud are fully mixed.

[0049] The dispersion tank 7 is also provided with a feeding port for adding chemicals from the feeding port for preliminary feeding treatment. The dispersion tank 7 is also provided with a second agitator to further disperse the rock chips in the dispersion tank 7 so that the slurry in the dispersion tank 7 has a certain suspension capacity.

[0050] The fine particle outlet of the first vibrating screen 8 is connected to a circulation tank 10, and the coarse particle outlet of the first vibrating screen 8 is connected to a grinder 9. The discharge port of the grinder 9 is connected to the circulation tank 10, and the circulation tank 10 is also connected to the inlet of the first vibrating screen 8 via a circulation pipe. Specifically, three 60-mesh vibrating screens are arranged on the first vibrating screen 8 to screen out rock chips larger than 300 microns and feed them into the grinder 9 for grinding.

[0051] Furthermore, a third agitator is provided in each of the circulation tank 10 and the slurry preparation tank 11. The slurry preparation tank 11 is also provided with a liquid inlet and a feed port. The wastewater collection tank 2 is also connected to the liquid inlet of the slurry preparation tank 11 via a liquid inlet pipe. The liquid inlet pipe is also provided with a filter 12 for removing impurities larger than 50 microns from the wastewater. After the particles meet the standards, the solid-liquid mixed slurry is added with chemicals through the feed port in the slurry preparation tank 11 for performance adjustment. The wastewater filtered by the filter 12 enters the slurry preparation tank 11 to adjust the solid-liquid ratio of the slurry.

[0052] The waste mud collection tank 1, the wastewater collection tank 2, and the rock cuttings collection tank 3 respectively collect the waste water-based mud, wastewater, and rock cuttings generated from the drilling operation. The rock cuttings are sorted by the second vibrating screen 4, and the rock cuttings larger than 0.85 mm enter the crusher 5 for crushing. The diameter of the crushed rock cuttings is 2-8 mm. The rock cuttings processed by the first vibrating screen 8 and the crusher 5 are transported to the mixing tank 6 in a certain proportion with the waste mud and wastewater. The first agitator in the mixing tank 6 shears the suspended rock cuttings, and the mud gun disperses the precipitated and compacted rock cuttings in the slurry. The rock cuttings are fully mixed with the waste mud and wastewater to form an initially dispersed slurry. The slurry then enters the dispersion tank 7, where the slurry undergoes preliminary feeding treatment to increase the slurry's ability to suspend rock cuttings. The slurry from the dispersion tank 7 enters the second vibrating screen 4, which screens out rock chips larger than 300 microns. The rock chips are then fed into the grinder 9 for grinding. The ground rock chips and the slurry that has passed through the second vibrating screen 4 enter the circulation tank 10, which then returns the slurry to the second vibrating screen 4 through a circulation pipe. This cycle continues until all rock chip particles in the slurry are less than 300 microns in size.

[0053] After the slurry particles meet the standards after being circulated through the grinder 9, they enter the slurry preparation tank 11. After the wastewater in the wastewater collection tank 2 passes through the filter 12 to remove impurities, it enters the slurry preparation tank 11 as needed. In the slurry preparation tank 11, water and chemicals are added to adjust the slurry's rheological properties, filter loss, drill cuttings content, density, pH value, stability, and other properties to meet the reinjection requirements. The slurry prepared in the slurry preparation tank 11 enters the slurry storage tank 13 for storage. After the slurry has been stored for a certain amount, the slurry is finally filtered through the filter device 14 and reinjected into the designated reinjection well through the reinjection pump group 15.

[0054] The above system can process 100 m³ / day of cuttings and 400 m³ / day of waste liquid.

[0055] To sum up, after reading the utility model document, ordinary technicians in this field can make various other corresponding transformation schemes based on the technical scheme and technical concept of the utility model without creative mental labor, which all fall within the scope of protection of the utility model.

Claims

1. A water-based drilling waste reinjection treatment system, characterized by: The invention comprises a waste collection tank, a slurry mixing tank (6), a dispersion tank (7), a first vibrating screen (8), a circulation tank (10), a slurry preparation tank (11), a slurry storage tank (13) and a reinjection pump group (15) which are connected in sequence; the dispersion tank (7) is also provided with a feeding port; the fine particle outlet of the first vibrating screen (8) is connected to the circulation tank (10), the coarse particle outlet of the first vibrating screen (8) is connected to a grinder (9), the discharge port of the grinder (9) is connected to the circulation tank (10), and the circulation tank (10) is also connected to the feed port of the first vibrating screen (8) through a circulation pipe; the slurry preparation tank (11) is also provided with a liquid inlet.

2. A water-based drilling waste reinjection treatment system according to claim 1, characterized in that: The waste collection tank comprises a rock cutting collection tank (3), a waste mud collection tank (1) and a wastewater collection tank (2).

3. A water-based drilling waste reinjection treatment system according to claim 2, characterized in that: The invention also includes a second vibrating screen (4) and a crusher (5) connected thereto, wherein the discharge port of the rock chip collecting tank (3) is connected to the feed port of the second vibrating screen (4), the coarse particle outlet of the second vibrating screen (4) is connected to the crusher (5), and the fine particle outlet of the second vibrating screen (4) and the discharge port of the crusher (5) are respectively connected to the slurry mixing tank (6).

4. A water-based drilling waste reinjection treatment system according to claim 3, characterized in that: The second vibrating screen (4) is connected to the discharge port of the cuttings collection tank (3) via a screw conveyor.

5. The water-based drilling waste reinjection treatment system according to claim 3, characterized in that: The mesh number of the screen cloth in the first vibrating screen (8) is greater than the mesh number of the screen cloth in the second vibrating screen (4).

6. The water-based drilling waste reinjection treatment system according to claim 2, characterized in that: The wastewater collection tank (2) is also connected to the liquid inlet of the slurry mixing tank (11) via a liquid inlet pipe, and a filter (12) is provided on the liquid inlet pipe.

7. A water-based drilling waste reinjection treatment system according to any one of claims 1 to 6, characterized in that: The mixing tank (6) is provided with a first agitator and a mud gun.

8. The water-based drilling waste reinjection treatment system according to claim 7, characterized in that: A second agitator is provided in the dispersion tank (7).

9. The water-based drilling waste reinjection treatment system according to claim 6, characterized in that: A filtering device (14) is also provided between the reinjection pump group (15) and the slurry storage tank (13).

10. The water-based drilling waste reinjection treatment system according to claim 6, characterized in that: The slurry mixing tank (11) is also provided with a drug adding port.

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