Integrated treatment system for water-based and oil-based drilling cuttings

Abstract

The utility model provides a water base, oil base drillings integrated treatment system, water base, oil base drillings integrated treatment system includes feeder, spin-dry centrifugal mechanism, solid residue collection tank and liquid phase recovery device, wherein the spin-dry centrifugal mechanism includes spin-dry machine, centrifuge, spin-dry machine liquid storage bin and centrifuge liquid storage bin, spin-dry machine is connected with feeder, and centrifuge liquid storage bin is connected with centrifuge liquid storage bin. The spin dryer conveys the spin-dried and separated liquid phase into a liquid storage bin of the spin dryer; the centrifugal machine is connected with the spin dryer liquid storage bin, the centrifugal machine liquid storage bin is connected with the centrifugal machine, and the centrifugal machine conveys a liquid phase obtained through centrifugal separation into the centrifugal liquid storage bin; the solid slag collecting tank is arranged on the outer side of the spin dryer, and the solid slag collecting tank is used for recycling solid slag separated by the spin dryer; and the liquid phase recovery device is connected with the liquid storage bin of the centrifugal machine and is used for recovering a liquid phase in the liquid storage bin of the centrifugal machine. The water-based and oil-based drilling cutting integrated treatment system disclosed by the utility model is high in integration degree and small in occupied area.

Description

Technical Field

[0001] The utility model relates to the technical field of environmental protection equipment for oil and natural gas drilling, and specifically to an integrated water-based and oil-based drilling cuttings processing system. Background Art

[0002] In the process of oil and gas drilling, especially in the drilling process of unconventional oil and gas wells, directional wells and ultra-deep wells, two mud systems are generally required at the drilling site. The first half of the drilling uses water-based mud, and the second half of the drilling uses oil-based mud. Therefore, the cuttings generated at the drilling site include not only water-based cuttings but also oil-based cuttings. Water-based cuttings mainly include multiphase suspensions composed of clay, weighting materials, various chemical treatment agents, sewage and cuttings. Oil-based cuttings mainly include a mixture of white oil, diesel or low-toxic mineral oil, asphalt, sewage, polymer compounds and cuttings. Improper treatment of these water-based and oil-based cuttings will cause serious pollution to the surrounding soil, vegetation, surface water and groundwater, endanger the surrounding ecological environment, and may even cause pollution accidents, seriously threatening human health. Therefore, all drilling sites are required to be equipped with a system for handling cuttings that do not fall to the ground. The existing drill cuttings treatment system that does not fall to the ground includes water-based drill cuttings treatment equipment and oil-based drill cuttings treatment equipment. The water-based drill cuttings treatment equipment is mainly composed of equipment such as filter presses, plunger pumps, mixing tanks and water tanks, and the oil-based drill cuttings treatment equipment is mainly composed of equipment such as hoppers, screw conveyors, spin dryers, centrifuges, etc. Since the existing water-based cuttings treatment system and the oil-based cuttings treatment system are completely different treatment processes, when the water-based drilling fluid and the oil-based drilling fluid are converted to each other, the cuttings treatment device also needs to be replaced accordingly. This brings about high-risk operations such as dismantling scaffolding, disassembling and assembling equipment, and hoisting, which increases safety risks while also increasing costs and construction cycles. Therefore, it is necessary to design a treatment system that is highly integrated, easy to carry, and can achieve integrated treatment of water-based and oil-based cuttings.

[0003] The Chinese patent application with the publication number "CN116003154A" and the name "Integrated centralized treatment system and process for water-based waste and oil-based waste from oil drilling" discloses an integrated centralized treatment system for water-based waste and oil-based waste from oil drilling. In this centralized treatment system, a treatment unit for oil-based waste is provided, and a spin dryer and a centrifuge are provided in the treatment unit. However, it is not integrated, occupies a large area, and is difficult to transport. Different from this application, in this application, each device in the treatment system is centrally arranged, and water-based drill cuttings and oil-based drill cuttings can be treated at the same time. It occupies a small area, is easy to disassemble and assemble, and is convenient for on-site construction of drilling. Utility Model Content

[0004] The purpose of the present invention is to solve at least one of the above-mentioned deficiencies in the prior art. For example, one of the purposes of the present invention is to provide a water-based and oil-based drill cuttings integrated processing system with a high degree of integration and a small footprint.

[0005] In order to achieve the above-mentioned purpose, the utility model provides, on the one hand, a water-based and oil-based integrated drilling cuttings processing system, which may include a feeder, a drying centrifugal mechanism, a solid residue collection tank and a liquid phase recovery device, wherein the drying centrifugal mechanism may include a dryer, a centrifuge, a dryer liquid storage tank and a centrifuge liquid storage tank, the dryer is arranged on the left side of the dryer liquid storage tank, the dryer is connected to the feeder, and the dryer conveys the liquid phase separated by drying to the dryer liquid storage tank; the centrifuge is arranged on the upper side of the centrifuge liquid storage tank, the centrifuge is connected to the dryer liquid storage tank, the centrifuge liquid storage tank is connected to the centrifuge, and the centrifuge conveys the liquid phase separated by centrifugation to the centrifugal liquid storage tank; the solid residue collection tank is arranged on the outside of the dryer, and the solid residue collection tank recovers the solid residue separated by the dryer; the liquid phase recovery device is connected to the centrifuge liquid storage tank, and recovers the liquid phase in the centrifuge liquid storage tank.

[0006] According to one or more exemplary embodiments of an aspect of the present invention, a first screw conveyor may be provided between the spin dryer and the solid slag collecting tank.

[0007] According to one or more exemplary embodiments of an aspect of the present invention, a second screw conveyor may be provided between the feeder and the spin dryer.

[0008] According to one or more exemplary embodiments of an aspect of the present invention, a first liquid supply pump may be provided between the liquid storage bin of the spin dryer and the centrifuge.

[0009] According to one or more exemplary embodiments of one aspect of the present invention, a second liquid supply pump may be provided between the centrifuge liquid storage bin and the liquid phase recovery device.

[0010] According to one or more exemplary embodiments of one aspect of the utility model, the dryer liquid storage bin and the centrifuge liquid storage bin can both be independent closed bins; the dryer liquid storage bin and the centrifuge liquid storage bin can be arranged side by side, and a partition is arranged between the dryer liquid storage bin and the centrifuge liquid storage bin.

[0011] According to one or more exemplary embodiments of one aspect of the present invention, the centrifuge speed may be 3195-3205 rpm; the separation factor may be 2575-2585.

[0012] According to one or more exemplary embodiments of an aspect of the present invention, the feeder may include a wheel feeder.

[0013] According to one or more exemplary embodiments of one aspect of the utility model, the water-based and oil-based drill cuttings integrated processing system may also include a chemical treatment mechanism, which is configured to prepare a flocculation liquid and is connected to a liquid phase recovery device via a pipeline.

[0014] According to one or more exemplary embodiments of one aspect of the utility model, the water-based and oil-based drill cuttings integrated processing system may adopt a skid-mounted design, with a feeder, a drying centrifuge mechanism, a solid residue collection tank and a liquid phase recovery device integrated on the skid base.

[0015] Compared with the prior art, the beneficial effects of the present invention include at least one of the following:

[0016] (1) The processing system provided by the utility model can simultaneously process water-based drill cuttings and oil-based drill cuttings in an integrated manner, with little impact on the environment;

[0017] (2) The treatment system provided by the utility model has a high degree of integration and is easy to assemble. There is no need for on-site assembly or disassembly, which improves construction efficiency and reduces floor space.

[0018] (3) The processing system provided by the utility model adopts wheel feeding technology, which reduces the crushing of rock cuttings during transportation, solves the problem that water-based drilling fluid rock cuttings are easily crushed, is conducive to reducing the liquid content of slag discharge and improving the quality of recovered fluid, and performs drying treatment on water-based rock cuttings;

[0019] (4) The treatment system provided by the utility model is equipped with a chemical treatment mechanism, which is combined with a centrifuge. By adding reagents according to on-site needs, liquid phase degelling, flocculation and dehydration can be achieved to achieve a "clear water and dry mud" treatment effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and other objects and / or features of the present invention will become more apparent through the following description in conjunction with the accompanying drawings, in which:

[0021] Figure 1 A front view of the layout of a water-based and oil-based drill cuttings integrated processing system of an exemplary embodiment of the utility model is shown;

[0022] Figure 2 A top view of the layout of a water-based and oil-based drill cuttings integrated processing system according to an exemplary embodiment of the present invention is shown.

[0023] Description of main reference numerals:

[0024] 1-feeder, 21-first screw conveyor, 22-second screw conveyor, 31-dryer, 32-dryer liquid storage tank, 33-first liquid supply pump, 34-solid residue collection tank, 41-centrifuge, 42-centrifuge liquid storage tank, 43-second liquid supply pump, 5-chemical treatment mechanism, 6-distribution box. DETAILED DESCRIPTION

[0025] Hereinafter, a water-based and oil-based drill cuttings integrated processing system of the present invention will be described in detail in conjunction with exemplary embodiments.

[0026] In the description of the present application, it should be understood that the terms "upper", "left", "right", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0027] The terms "first", "second", etc. are only for the convenience of description and distinction, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of this application, it should be noted that, unless otherwise clearly specified and defined, the terms "connection" and "external connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0028] First Exemplary Embodiment

[0029] The present exemplary embodiment provides a water-based and oil-based drill cuttings integrated processing system.

[0030] Figure 1 A front view of the layout of a water-based and oil-based drill cuttings integrated processing system of an exemplary embodiment of the utility model is shown; Figure 2 A top view of the layout of a water-based and oil-based drill cuttings integrated processing system of an exemplary embodiment of the utility model is shown. Figures 1-2 A water-based and oil-based drill cuttings integrated processing system of the present exemplary embodiment is described.

[0031] In this exemplary embodiment, Figure 1 or Figure 2As shown in , the integrated water-based and oil-based drill cuttings processing system mainly includes a feeder 1, a drying centrifugal mechanism, a solid residue collection tank and a liquid phase recovery device. Among them, the feeder can be arranged on the left side of the dryer to receive water-based or oil-based drill cuttings discharged from the well team's solid control system, and transport the drill cuttings to the dryer. The drying centrifugal mechanism may include a dryer 31 and a dryer liquid storage tank 32 arranged on the right side of the dryer, and a centrifuge 41 and a centrifuge liquid storage tank 42 arranged below the centrifuge. The dryer 31 transports the liquid phase separated by drying to the dryer liquid storage tank 32. In addition, a suspended scraper can be provided in the dryer to ensure that the moisture content of the drill cuttings discharged by the dryer is about 7%, and to avoid clogging of the screen. It can be recycled without adding a curing agent, which can reduce solid waste emissions by 60%. As Figure 2 As shown in , the solid residue collection tank 34 can be arranged outside the dryer 31 and connected to the dryer 31, for example, it can be arranged near the outside of the dryer to recycle the solid residue separated by the dryer 31. Figure 1 As shown in or 2, the centrifuge 41 is connected to the spin dryer liquid storage bin 32, and the spin dryer liquid storage bin 32 conveys the liquid phase therein to the centrifuge 41 for solid-liquid separation again. The centrifuge liquid storage bin 42 is connected to the centrifuge 41. The liquid phase separated by the centrifuge 41 directly enters the centrifuge liquid storage bin 42. The liquid phase recovery device is connected to the centrifuge liquid storage bin 42 to recover the liquid phase in the centrifuge liquid storage bin 42. The liquid phase recovery device may include a mud tank. The water-based and oil-based drill cuttings integrated processing system processes water-based drill cuttings and oil-based drill cuttings respectively. When the drill cuttings processing type changes, for example, from water-based drill cuttings to oil-based drill cuttings, or from oil-based drill cuttings to water-based drill cuttings, the water-based and oil-based drill cuttings integrated processing system only needs to be simply cleaned, and it can be used again after cleaning. In addition, the water-based and oil-based drill cuttings integrated processing system may also include a distribution box 6 to supply power to the entire water-based and oil-based drill cuttings integrated processing system.

[0032] In this exemplary embodiment, Figure 2 As shown in , a first screw conveyor 21 can be arranged between the dryer 31 and the solid residue collection tank 34. The feed port of the first screw conveyor 21 is connected to the dryer 31, and the discharge port of the first screw conveyor 21 is connected to the solid residue collection tank 34. The first screw conveyor 21 can be arranged directly below the dryer. The first screw conveyor 21 can be arranged vertically to the skid base. The solid residue separated by the dryer 31 falls directly into the feed port of the first screw conveyor, and then is transported to the solid residue collection tank through the first screw conveyor. The screw conveyor can perform stable transportation when the site is limited, and is less affected by the environment. In addition, it is not easy to cause the solid residue to fall during the transportation process, and the impact on the environment is small.

[0033] In this exemplary embodiment, Figure 2As shown in the figure, a second screw conveyor 22 is provided between the feeder 1 and the spin dryer 31. The feeder 1 can convey the drill cuttings to be separated into solid and liquid to the spin dryer 31 through the second screw conveyor 22. Furthermore, the feed port of the second screw conveyor 22 (i.e., the end port where the second screw conveyor is connected to the feeder) can be arranged directly above the spin dryer 31, and the feeder 1 receives the water-based or oil-based drill cuttings discharged from the well team solid control system. Here, a structure for lifting drill cuttings is provided inside the feeder, which can lift the rock cuttings from a low place to a high place, and then pour them on the screw conveyor, and then the second screw conveyor conveys the materials to the feed port of the spin dryer. That is, the second screw conveyor can be used for the translational transportation of drill cuttings, and the feeder can be used for the lifting and lowering transportation of drill cuttings. The second screw conveyor combined with the feeder can realize the lifting and lowering translational transportation of drill cuttings, so that they can smoothly enter the spin dryer for separation. The drill cuttings are lifted internally and then conveyed to the top of the inlet of the spin dryer 31 by the second screw conveyor 22, and fall into the inlet of the spin dryer 31 under the action of gravity. This saves construction costs and improves construction efficiency.

[0034] In this exemplary embodiment, Figure 1 As shown in , both the dryer liquid storage bin 32 and the centrifuge liquid storage bin 42 can be independent closed bins. The dryer liquid storage bin 32 and the centrifuge liquid storage bin 42 can be arranged side by side. The dryer liquid storage bin can be arranged on the right side of the dryer, and the centrifuge liquid storage bin can be arranged on the right side of the dryer liquid storage bin. There is no need to separately install or disassemble the dryer liquid storage bin 32 and the centrifuge liquid storage bin 42. It saves space and is convenient for transportation. A partition is arranged between the dryer liquid storage bin 32 and the centrifuge liquid storage bin 42.

[0035] In this exemplary embodiment, Figure 1 As shown in the figure, the centrifuge 41 can be arranged above the dryer liquid storage bin 32 and the centrifuge liquid storage bin 42. A first liquid supply pump 33 can be arranged between the dryer liquid storage bin 32 and the centrifuge 41. The inlet end of the first liquid supply pump 33 is connected to the dryer liquid storage bin 32. Its outlet end is connected to the centrifuge 41. The first liquid supply pump 33 transports the liquid phase in the dryer liquid storage bin 32 to the centrifuge 41 for solid-liquid separation again. The liquid phase separated by the centrifuge 41 falls directly into the centrifuge liquid storage bin 42. The solid residue separated by the dryer 31 can be input into the solid residue collection tank 34 through the first screw conveyor 21. The position of the first liquid supply pump 33 can be arranged between the dryer 31 and the dryer liquid storage bin 32, which is convenient for overall transportation.

[0036] In this exemplary embodiment, Figure 1As shown in FIG. 2 , a second liquid supply pump 43 may be provided between the centrifuge liquid storage bin 42 and the liquid phase recovery device, for example, provided between the right side of the centrifuge liquid storage bin and the liquid phase recovery device. The second liquid supply pump 43 transports the liquid phase in the centrifuge liquid storage bin 42 to the liquid phase recovery device. The liquid phase in the liquid phase recovery device can be reused or recycled by other means.

[0037] In this exemplary embodiment, the rotation speed of the centrifuge can be 3195-3205 rpm, such as 3197 rpm, 3200 rpm or 3202 rpm. The separation factor is 2575-2585, such as 2577, 2580 or 2582. Its separation effect is 5.6 times that of the centrifuge currently used by the well team.

[0038] In this exemplary embodiment, Figure 1 As shown in FIG. 2 , the feeder 1 may include a wheel feeder. This reduces the possibility of rock cuttings being broken during transportation. This solves the problem of easy breakage of water-based drilling fluid rock cuttings, helps reduce the liquid content of slag discharge and improve the quality of recovered fluid, and makes it possible to dry the water-based rock cuttings.

[0039] In this exemplary embodiment, Figure 2 As shown in , the integrated water-based and oil-based drill cuttings processing system may also include a chemical treatment mechanism 5. The chemical treatment mechanism 5 is arranged between the first liquid supply pump and the centrifuge 41. For example, it can be connected to the outlet end of the first liquid supply pump through a pipeline. The chemical treatment mechanism 5 can be arranged near the outside of the centrifuge 41. The chemical treatment mechanism 5 can be used to configure the flocculation liquid when treating water-based mud. It is added to the water-based mud to be treated through a pipeline, so that the tiny suspended particles in the water-based mud are aggregated to form larger flocs, thereby facilitating the centrifuge to perform better solid-liquid separation. In addition, there is no need to set a chemical treatment mechanism between the feeder and the dryer, because the dryer processes large particles and does not need flocculation treatment. The chemical treatment mechanism is combined with the centrifuge, and the additive can be configured according to the needs of the site to achieve the degelling-flocculation-dehydration treatment of the liquid phase, so as to achieve the treatment effect of "clear water and dry mud".

[0040] In this exemplary embodiment, Figure 1As shown in , the integrated water-based and oil-based drill cuttings processing system can adopt a skid-mounted design. Here, the drying centrifugal mechanism, the first screw conveyor 21, the second screw conveyor 22, the first liquid supply pump 33 and the second liquid supply pump 43 can be integrated into an integrated tank and arranged on the skid base. The system structure is simplified, the floor space is greatly reduced, and the equipment connection and disassembly process during use is also avoided, which greatly facilitates the operation at the drilling site. As an embodiment of the utility model, the feeder, the drying centrifugal mechanism, and the chemical treatment mechanism can each independently form a skid. There are three skids in total, so that two vehicles can be assembled and transported to form a complete integrated water-based and oil-based drill cuttings processing system.

[0041] In summary, the advantages of the present invention may include at least one of the following:

[0042] (1) The processing system provided by the utility model can simultaneously process water-based drill cuttings and oil-based drill cuttings in an integrated manner, with little impact on the environment;

[0043] (2) The treatment system provided by the utility model has a high degree of integration and is easy to assemble. There is no need for on-site assembly or disassembly, which improves construction efficiency and reduces floor space.

[0044] (3) The spin dryer of the treatment system provided by the utility model adopts floating scraper technology, so that the moisture content of the drill cuttings discharged by the spin dryer is about 7%, and the screen can be prevented from being blocked. It can be recycled without adding a curing agent, which can reduce the discharge of solid waste by 60%;

[0045] (4) The treatment system provided by the utility model is equipped with a large-displacement high-efficiency centrifuge, whose separation effect is 5.6 times that of the centrifuge currently used by the well team (speed 1600rpm, separation factor 860), and the construction efficiency is high;

[0046] (5) The processing system provided by the utility model adopts a skid-mounted design. The integrated tank integrates the dryer, centrifuge, liquid supply pump, screw conveyor, dryer liquid storage tank and centrifuge liquid storage tank on the skid base. No individual connection is required between the devices, and the installation and disassembly efficiency is high and the transportation is convenient.

[0047] Although a water-based and oil-based integrated drilling cuttings processing system has been described above in conjunction with exemplary embodiments, it should be clear to those skilled in the art that various modifications and changes may be made to the exemplary embodiments of the present invention without departing from the spirit and scope defined by the claims.

Claims

1. A water-based and oil-based drill cuttings integrated processing system, characterized in that: The water-based and oil-based drill cuttings integrated processing system includes a feeder, a drying centrifugal mechanism, a solid slag collection tank and a liquid phase recovery device, wherein: The drying centrifugal mechanism comprises a drying machine, a centrifuge, a drying machine liquid storage bin and a centrifuge liquid storage bin. The drying machine is arranged on the left side of the drying machine liquid storage bin, the drying machine is connected to the feeder, and the drying machine transports the liquid phase separated by drying to the drying machine liquid storage bin; the centrifuge is arranged on the upper side of the centrifuge liquid storage bin, the centrifuge is connected to the drying machine liquid storage bin, the centrifuge liquid storage bin is connected to the centrifuge, and the centrifuge transports the liquid phase separated by centrifugation to the centrifuge liquid storage bin; The solid residue collection tank is arranged outside the spin dryer, and the solid residue collection tank recycles the solid residue separated by the spin dryer; The liquid phase recovery device is connected to the centrifuge liquid storage bin to recover the liquid phase in the centrifuge liquid storage bin.

2. The water-based and oil-based drill cuttings integrated processing system according to claim 1 is characterized in that: A first screw conveyor is arranged between the spin dryer and the solid slag collecting tank.

3. The water-based and oil-based drill cuttings integrated processing system according to claim 1 or 2, characterized in that: A second screw conveyor is arranged between the feeder and the spin dryer.

4. The integrated water-based and oil-based drilling cuttings processing system according to claim 1 is characterized in that: A first liquid supply pump is arranged between the liquid storage bin of the spin dryer and the centrifuge.

5. The water-based and oil-based drill cuttings integrated processing system according to claim 1 or 4, characterized in that: A second liquid supply pump is arranged between the centrifuge liquid storage bin and the liquid phase recovery device.

6. The water-based and oil-based drill cuttings integrated processing system according to claim 1, characterized in that: The dryer liquid storage bin and the centrifuge liquid storage bin are both independent closed bins; the dryer liquid storage bin and the centrifuge liquid storage bin are arranged in parallel, and a partition is arranged between the dryer liquid storage bin and the centrifuge liquid storage bin.

7. The integrated water-based and oil-based drilling cuttings processing system according to claim 1 is characterized in that: The centrifuge speed is 3195-3205 rpm; the separation factor is 2575-2585.

8. The integrated water-based and oil-based drilling cuttings processing system according to claim 1, characterized in that: The feeder comprises a wheel feeder.

9. The integrated water-based and oil-based drill cuttings processing system according to claim 1, characterized in that: The water-based and oil-based drill cuttings integrated processing system further comprises a chemical processing mechanism, which is configured to prepare a flocculation liquid and is connected to a liquid phase recovery device via a pipeline.

10. The water-based and oil-based drill cuttings integrated processing system according to claim 1, characterized in that: The water-based and oil-based drill cuttings integrated processing system adopts a skid-mounted design, and a feeder, a drying centrifugal mechanism, a solid residue collection tank and a liquid phase recovery device are integrated on the skid base.

Images