Drilling fluid weighting agent recovery device and recovery method
By combining a mixer and a centrifuge in the drilling fluid weighting agent recovery device, the problem of difficult recovery of weighting agents in high-density drilling fluid is solved, achieving uniform mixing of weighting agents and simplifying equipment, thereby improving recovery efficiency and on-site operation convenience.
Patent Information
- Application Number
- CN202410553954.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-07
- Publication Date
- 2025-11-07
AI Technical Summary
In existing technologies, the content of harmful solid phases such as rock cuttings increases during the recycling process of high-density drilling fluids, making it difficult to effectively recover weighting agents. Furthermore, the equipment is complex and inconvenient to use on-site.
A drilling fluid weighting agent recovery device is adopted, which uses a mixer to uniformly mix the recovered weighting agent with the drilling fluid to avoid sedimentation, and uses a recovery centrifuge and a high-speed centrifuge to separate rock cuttings, simplifying the equipment structure.
It achieves efficient recovery of weighting agents, avoids sedimentation, reduces the number of equipment, and improves the convenience of on-site use.
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Figure CN120906497A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of drilling, more particularly, to a drilling fluid weighting agent recovery device. BACKGROUND
[0002] With large-scale drilling of deep wells and ultra-deep wells, high-density drilling fluids with barite powder and other weighting agents are increasingly widely used. During the circulation of high-density drilling fluids, the content of harmful solid phases such as cuttings gradually increases, resulting in a decrease in the performance of the drilling fluid.
[0003] In order to remove harmful solid phases such as cuttings, high-density drilling fluids need to be periodically cleaned by centrifugation. However, the weighting agent is also separated and discarded during centrifugal cleaning, which not only causes great waste but also increases environmental protection treatment costs.
[0004] In order to avoid the waste of weighting agents, the following method is currently used to recover the weighting agent: first, the drilling fluid is transported into a medium-speed centrifuge, most of the weighting agent is separated and discharged into a circulating tank, and the separated drilling fluid is discharged into a buffer tank; then the drilling fluid in the buffer tank is transported into a high-speed centrifuge, the cuttings are separated and discharged, and the clean drilling fluid is discharged into the circulating tank.
[0005] However, the above recovery method has the following problems: the weighting agent separated by the medium-speed centrifuge is very viscous, the weighting agent is difficult to disperse after being discharged into the circulating tank, and is prone to precipitation, resulting in poor recovery effect; the matching buffer tank not only increases the number of equipment, but also is inconvenient to use on site.
[0006] In summary, how to effectively recover the weighting agent in the high-density drilling fluid is a problem that needs to be solved by the technical personnel in the field. SUMMARY
[0007] Therefore, the purpose of the present application is to provide a drilling fluid weighting agent recovery device that uniformly mixes the recovered weighting agent with the drilling fluid in the mixing tank, avoiding the precipitation of the weighting agent and achieving good recovery effect.
[0008] In addition, the present application also provides a recovery method for the above-mentioned drilling fluid weighting agent recovery device.
[0009] In order to achieve the above-mentioned purpose, the present application provides the following technical solutions:
[0010] A drilling fluid weighting agent recovery device, comprising:
[0011] A slurry pump for pumping high-density drilling fluid containing cuttings;
[0012] A recovery centrifuge connected to the slurry pump through a slurry inlet valve for separating and recovering the weighting agent;
[0013] a mixing tank connected with the slurry supply pump through a slurry mixing valve and with the heavy agent outlet of the recovery centrifuge, for mixing the drilling fluid and separating and recovering the heavy agent to prevent the heavy agent from precipitating;
[0014] a high-speed centrifuge connected with the drilling fluid outlet of the recovery centrifuge, for separating the drilling fluid and the cuttings;
[0015] a circulating tank connected with the drilling fluid outlet of the high-speed centrifuge and with the liquid outlet of the mixing tank.
[0016] Preferably, when the drilling fluid outlet of the recovery centrifuge is lower than the liquid inlet of the high-speed centrifuge, an overflow pump is arranged between the recovery centrifuge and the high-speed centrifuge, for conveying the separated drilling fluid containing cuttings into the high-speed centrifuge.
[0017] Preferably, an overflow bin is arranged at the drilling fluid outlet of the recovery centrifuge, and the overflow bin is connected with the circulating tank through an anti-overflow pipe, and the anti-overflow pipe is provided with an anti-overflow valve for controlling the opening and closing of the anti-overflow pipe.
[0018] A detection sensor is arranged in the overflow bin, and when the overflow bin is full, the detection sensor outputs a full signal to the outside, and the anti-overflow valve is opened.
[0019] Preferably, an overflow bin is arranged at the drilling fluid outlet of the recovery centrifuge, and the overflow bin is connected with the circulating tank through an anti-overflow pipe, and the anti-overflow pipe is connected with the top of the overflow bin, so as to discharge the drilling fluid containing cuttings into the circulating tank when the overflow bin is full.
[0020] Preferably, an overflow pipe is arranged at the bottom of the overflow bin, and the overflow pipe is communicated with the circulating tank, and the overflow pipe is provided with an overflow valve for controlling the opening and closing of the overflow pipe.
[0021] Preferably, the slurry discharge pipe of the mixing tank, the anti-overflow pipe and the overflow pipe are communicated to form a slurry discharge pipe junction.
[0022] Preferably, the recovery centrifuge, the mixing tank and the high-speed centrifuge are all installed on a base, and the mixing tank is arranged below the underflow bin of the recovery centrifuge.
[0023] Preferably, the slurry supply pump, the recovery centrifuge and the mixing tank are connected through a slurry inlet pipe junction, and the slurry inlet pipe junction is a three-way pipe.
[0024] A recovery method for the drilling fluid heavy agent recovery device described in any one of the above, comprising:
[0025] Adjust the slurry inlet valve and the slurry mixing valve, so that the high-density drilling fluid with rock debris is separated into the recycling centrifuge and the slurry mixer;
[0026] The recycling centrifuge is used to separate the weighting agent, the separated weighting agent is discharged into the slurry mixer for uniform mixing, and the mixed weighting agent is discharged into the circulating tank;
[0027] The separated drilling fluid containing debris is transported to the high-speed centrifuge, the high-speed centrifuge is used to separate clean drilling fluid and rock debris, and the clean drilling fluid is discharged into the circulating tank.
[0028] The drilling fluid weighting agent recycling device provided by the application separates the weighting agent by using a recycling centrifuge, uniformly mixes the separated weighting agent and the drilling fluid in a slurry mixer, avoids the precipitation of the weighting agent, has good recycling effect, and the uniformly mixed weighting agent is also discharged into the circulating tank, so that a buffer tank is not needed, the number of devices is small, and the device is convenient to use on site.
[0029] In addition, the application further provides a recycling method for the drilling fluid weighting agent recycling device. BRIEF DESCRIPTION OF DRAWINGS
[0030] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only belong to the embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of the provided drawings.
[0031] Figure 1 The principle diagram of the drilling fluid weighting agent recycling device provided by the application;
[0032] Figure 2 The structure diagram of the specific embodiment of the drilling fluid weighting agent recycling device provided by the application;
[0033] Figure 3 The structure diagram of the specific embodiment of the drilling fluid weighting agent recycling device provided by the application; Figure 2 The structure diagram of the specific embodiment of the drilling fluid weighting agent recycling device provided by the application;
[0034] Figures 1-3 The structure diagram of the specific embodiment of the drilling fluid weighting agent recycling device provided by the application;
[0035] 1-slurry supply pump; 2-slurry inlet valve; 3-recycling centrifuge; 301-bottom flow bin; 302-overflow bin; 4-overflow pump; 5-high-speed centrifuge; 6-slurry mixing valve; 7-slurry mixer; 8-overflow prevention pipe; 9-overflow pipe; 10-overflow valve; 11-circulating tank; 12-slurry inlet manifold; 13-slurry discharge manifold; 14-base. DETAILED DESCRIPTION
[0036] Clearly, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present application.
[0037] The core of the present application is to provide a drilling fluid weighting agent recovery device, which uniformly mixes the recovered weighting agent with the drilling fluid in the mixing tank, thereby avoiding the precipitation of the weighting agent and achieving good recovery effect.
[0038] In addition, the present application also provides a recovery method for the above drilling fluid weighting agent recovery device.
[0039] The drilling fluid weighting agent recovery device provided by the present application comprises:
[0040] The slurry supply pump 1 is used to extract high-density drilling fluid containing cuttings;
[0041] The recovery centrifuge 3 is connected with the slurry supply pump 1 through the slurry inlet valve 2 and is used to separate and recover the weighting agent;
[0042] The mixing tank 7 is connected with the slurry supply pump 1 through the slurry mixing valve 6 and is connected with the weighting agent outlet of the recovery centrifuge 3, and is used to uniformly mix the drilling fluid and the separated and recovered weighting agent to avoid the precipitation of the weighting agent;
[0043] The high-speed centrifuge 5 is connected with the drilling fluid outlet of the recovery centrifuge 3 and is used to separate the drilling fluid and the cuttings;
[0044] The circulating tank 11 is connected with the drilling fluid outlet of the high-speed centrifuge 5 and is connected with the liquid outlet of the mixing tank 7.
[0045] Among them, the slurry inlet valve 2 and the slurry mixing valve 6 are both flow control valves, which can be manual valves or electric control valves, and the specific types and models of the two are determined according to the actual production needs, which will not be described here.
[0046] When working, please refer to Figure 1 The slurry supply pump 1 extracts high-density drilling fluid containing cuttings, part of the high-density drilling fluid enters the recovery centrifuge 3 through the slurry inlet valve 2, the slurry inlet valve 2 can adjust the flow of the drilling fluid entering the recovery centrifuge 3, that is, the processing capacity of the recovery centrifuge 3, and the other part of the high-density drilling fluid enters the mixing tank 7 through the slurry mixing valve 6, and the slurry mixing valve 6 can adjust the flow of the drilling fluid entering the mixing tank 7;
[0047] The recovery centrifuge 3 separates most of the weighting agent and discharges the weighting agent into the mixing tank 7, and the weighting agent is mixed with the drilling fluid in the mixing tank 7, and after uniform mixing, the weighting agent is discharged into the circulating tank 11;
[0048] The cuttings-containing drilling fluid separated by the recycling centrifuge 3 is then transported to the high-speed centrifuge 5, the high-speed centrifuge 5 separates the cuttings and discharges them, and the cleaned drilling fluid is discharged into the circulating tank 11.
[0049] In the embodiment, the recycling centrifuge 3 is used to separate the weighting agent, and the separated weighting agent and the drilling fluid are mixed uniformly in the slurry mixer 7, so that the weighting agent is prevented from being deposited, and the recycling effect is good; the uniformly mixed weighting agent is also discharged into the circulating tank 11, and a buffer tank is not needed, so that the number of devices is small, and the on-site use is convenient.
[0050] When the drilling fluid outlet of the recycling centrifuge 3 is higher than or equal to the liquid inlet of the high-speed centrifuge 5, the cuttings-containing drilling fluid can flow into the high-speed centrifuge 5 under the influence of gravity or water pressure;
[0051] When the drilling fluid outlet of the recycling centrifuge 3 is lower than the liquid inlet of the high-speed centrifuge 5, an overflow pump 4 needs to be arranged between the recycling centrifuge 3 and the high-speed centrifuge 5, and the overflow pump 4 is used to transport the cuttings-containing drilling fluid separated by the recycling centrifuge 3 to the high-speed centrifuge 5.
[0052] The specific types and models of the overflow pump 4 and the slurry supply pump 1 are determined according to the actual production needs by referring to the prior art, and are not described herein.
[0053] In a specific embodiment, please refer to Figure 3 , the recycling centrifuge 3 and the liquid inlet of the high-speed centrifuge 5 are at the same height, the drilling fluid outlet of the recycling centrifuge 3 is arranged at the bottom of the recycling centrifuge 3, and therefore the overflow pump 4 is arranged between the recycling centrifuge 3 and the high-speed centrifuge 5, and the cuttings-containing drilling fluid is transported upward to the liquid inlet of the high-speed centrifuge 5 by the overflow pump 4.
[0054] On the basis of the above embodiment, the overflow bin 302 is arranged at the drilling fluid outlet of the recycling centrifuge 3, the overflow bin 302 is connected with the circulating tank 11 through the anti-overflow pipe 8, and the anti-overflow pipe 8 is provided with an anti-overflow valve for controlling the opening and closing of the anti-overflow pipe 8.
[0055] The overflow bin 302 is provided with a detection sensor, when the overflow bin 302 is full, the detection sensor outputs a full signal to the outside, and the anti-overflow valve is opened.
[0056] The anti-overflow pipe 8 communicates the overflow bin 302 and the circulating tank 11, and is used to directly discharge the cuttings-containing drilling fluid into the circulating tank 11 when the processing capacity of the high-speed centrifuge 5 is less than the processing capacity of the recycling centrifuge 3, that is, when the allowable flow rate of the high-speed centrifuge 5 is less than the allowable flow rate of the recycling centrifuge 3, so as to prevent the recycling centrifuge 3 from failing, and ensure the safety of the drilling fluid weighting agent recycling device.
[0057] The anti-overflow valve is arranged on the anti-overflow pipe 8 and is used to control the opening and closing of the anti-overflow pipe 8. When the anti-overflow valve is opened, the drilling fluid containing cuttings in the overflow bin 302 can flow into the circulating tank 11 through the anti-overflow pipe 8. When the anti-overflow valve is closed, the drilling fluid containing cuttings flows into and temporarily stores in the pipe section of the anti-overflow pipe 8 above the anti-overflow valve, and then flows into the high-speed centrifuge 5 after the pipe section is filled with the drilling fluid containing cuttings.
[0058] The anti-overflow valve can be a manual valve or an electrically controlled valve. The specific type and model of the anti-overflow valve are determined according to the actual production needs by referring to the existing technology, and will not be described here.
[0059] The overflow bin 302 is provided with a detection sensor. The detection sensor is used to detect whether the overflow bin 302 is full, so as to manually or automatically switch the communication state of the anti-overflow valve. The working principle of the detection sensor is not limited, and can be set as a liquid level sensor, a weight sensor, etc.
[0060] When the detection sensor is a liquid level sensor, the liquid level of the drilling fluid containing cuttings in the overflow bin 302 reaches a preset height, and the liquid level sensor outputs a full signal. When the detection sensor is a weight sensor, the weight of the drilling fluid containing cuttings in the overflow bin 302 reaches a preset mass, and the weight sensor outputs a full signal.
[0061] It should be noted that, in order to avoid the occurrence of fullness, the detection sensor will actually output a full signal when it is about to overflow. Taking the liquid level sensor as an example, assuming that the height of the overflow bin 302 is L, the preset height is usually set to 0.95L, and the preset height is not set to L.
[0062] When the overflow bin 302 is full, the detection sensor outputs a full signal to the outside. When the anti-overflow valve is a manual valve, the detection sensor outputs a warning signal as the full signal through an LED warning light, a buzzer, etc. When the anti-overflow valve is an electrically controlled valve, the full signal is a control electric signal of the electrically controlled valve. Compared with manual control, the automatic and intelligent degree is high, the response speed is fast, and the safety is stronger.
[0063] In the embodiment, the anti-overflow pipe 8 is arranged between the overflow bin 302 and the circulating tank 11, which avoids the fullness of the overflow bin 302, ensures the normal work of the recovery centrifuge 3, and further guarantees the safety of the drilling fluid weighting agent recovery device.
[0064] The detection sensor is used to detect whether the overflow bin 302 is full, which has high automation degree, fast response speed, and is beneficial to further improve the safety.
[0065] On the basis of the above embodiment, in order to simplify the structure of the device and reduce the cost, please refer to Figure 3The overflow bin 302 is connected with the circulating tank 11 through the anti-overflow pipe 8, and the anti-overflow pipe 8 is connected with the top of the overflow bin 302, so that the drilling fluid containing cuttings is discharged into the circulating tank 11 when the overflow bin 302 is full.
[0066] Since the anti-overflow pipe 8 is connected with the top of the overflow bin 302, when the liquid level in the overflow bin 302 is lower than the connection position of the two, the drilling fluid containing cuttings cannot flow into the anti-overflow pipe 8, so that the anti-overflow pipe 8 is cut off; and when the liquid level in the overflow bin 302 is higher than or equal to the connection position of the two, the drilling fluid containing cuttings naturally flows into the anti-overflow pipe 8 and is discharged into the circulating tank 11 through the anti-overflow pipe 8.
[0067] In the embodiment, whether the overflow bin 302 is full is determined by whether the liquid level is higher than the connection position of the anti-overflow pipe 8 and the overflow bin 302, compared with determining whether the overflow bin 302 is full by using a detection sensor, the device structure is simple, the equipment cost is low, and it is beneficial to modification on the existing drilling fluid recovery device.
[0068] On the basis of the above embodiment, the bottom of the overflow bin 302 is provided with an overflow pipe 9, the overflow pipe 9 is communicated with the circulating tank 11, and the overflow pipe 9 is provided with an overflow valve 10 for controlling the opening and closing of the overflow pipe 9.
[0069] The overflow pipe 9 is used for temporarily storing the drilling fluid containing cuttings, the overflow valve 10 is used for controlling the opening and closing of the overflow pipe 9, and the overflow valve 10 is in a closed state when the drilling fluid weighting agent recovery device works.
[0070] The specific type and model of the overflow valve 10 are determined according to the actual production needs by referring to the existing technology, and will not be described here.
[0071] In a specific embodiment, please refer to Figure 2 and Figure 3 The recovery centrifuge 3, the mud mixer 7 and the high-speed centrifuge 5 are all installed on the base 14, the mud mixer 7 is arranged below the underflow bin 301 of the recovery centrifuge 3, the land occupation of the mud mixer 7 is saved, and the setting of the drilling fluid weighting agent recovery device is facilitated.
[0072] The slurry supply pump 1, the recovery centrifuge 3 and the mud mixer 7 are connected through the slurry inlet pipe junction 12, the slurry inlet pipe junction 12 is a three-way pipe, compared with that the slurry supply pump 1 is respectively connected with the recovery centrifuge 3 and the mud mixer 7 through independent pipes, the pipe layout is simple and convenient for assembly.
[0073] The slurry discharge pipe of the mud mixer 7, the anti-overflow pipe 8 and the overflow pipe 9 are all communicated, so as to form the slurry discharge pipe junction 13, compared with that the three are respectively connected with the circulating tank 11, the pipe layout is simple and convenient for assembly.
[0074] In addition to the drilling fluid weighting agent recovery device, the application further provides a recovery method for the drilling fluid weighting agent recovery device disclosed in the above embodiments, comprising:
[0075] The slurry feeding valve 2 and the slurry mixing valve 6 are adjusted to separate the high-density drilling fluid with cuttings into the recovery centrifuge 3 and the slurry mixer 7;
[0076] The weighting agent is separated by the recovery centrifuge 3, the separated weighting agent is discharged into the slurry mixer 7 for uniform mixing, and the mixed weighting agent is discharged into the circulating tank 11;
[0077] The separated cuttings-containing drilling fluid is transported to the high-speed centrifuge 5, the clean drilling fluid and the cuttings are separated by the high-speed centrifuge 5, and the clean drilling fluid is discharged into the circulating tank 11.
[0078] In the specification, each embodiment is described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts between each embodiment can be referred to each other.
[0079] The drilling fluid weighting agent recovery device and the recovery method provided by the application are described in detail above. The principles and implementation manners of the application are described by applying specific examples. The above description of the embodiments is only used to help understand the method of the application and its core idea. It should be pointed out that, for those skilled in the art, without departing from the principles of the application, the application can be improved and modified in several ways, and these improvements and modifications also fall within the protection scope of the claims of the application.
Claims
1. A drilling fluid weighting agent recovery apparatus, characterized by, The application relates to a slurry separation and recovery device for high-density drilling fluid containing rock cuttings. The device comprises a slurry supply pump (1) for pumping high-density drilling fluid containing rock cuttings; a recovery centrifuge (3) connected with the slurry supply pump (1) through a slurry inlet valve (2) for separating and recovering weighting agents; a slurry mixer (7) connected with the slurry supply pump (1) through a slurry mixing valve (6) and connected with a weighting agent outlet of the recovery centrifuge (3) for uniformly mixing drilling fluid and separated and recovered weighting agents to prevent the weighting agents from precipitating; a high-speed centrifuge (5) connected with a drilling fluid outlet of the recovery centrifuge (3) for separating drilling fluid and rock cuttings; and a circulating tank (11) connected with a drilling fluid outlet of the high-speed centrifuge (5) and connected with a drilling fluid outlet of the slurry mixer (7). When the drilling fluid outlet of the recovery centrifuge (3) is lower than the drilling fluid inlet of the high-speed centrifuge (5), an overflow pump (4) is arranged between the recovery centrifuge (3) and the high-speed centrifuge (5), and the overflow pump (4) is used for conveying separated drilling fluid containing cuttings into the high-speed centrifuge (5). An overflow bin (302) is arranged at the drilling fluid outlet of the recovery centrifuge (3), the overflow bin (302) is connected with the circulating tank (11) through an anti-overflow pipe (8), the anti-overflow pipe (8) is provided with an anti-overflow valve used for controlling the anti-overflow pipe (8) to be opened or closed; A detection sensor is arranged in the overflow bin (302), when the overflow bin (302) is full, the detection sensor outputs a full signal to the outside, and the anti-overflow valve is opened. An overflow bin (302) is arranged at the drilling fluid outlet of the recovery centrifuge (3), the overflow bin (302) is connected with the circulating tank (11) through an anti-overflow pipe (8), the anti-overflow pipe (8) is connected with the top of the overflow bin (302), so that when the overflow bin (302) is full, the drilling fluid containing cuttings is discharged into the circulating tank (11).
2. The drilling fluid weighting agent recovery apparatus of claim 1, wherein, The bottom of the overflow bin (302) is provided with an overflow pipe (9) which is communicated with the circulating tank (11), and the overflow pipe (9) is provided with an overflow valve (10) used for controlling the overflow pipe (9) to be opened or closed.
3. The drilling fluid weighting agent recovery apparatus of claim 1, wherein, The slurry discharge pipe of the slurry mixer (7), the anti-overflow pipe (8) and the overflow pipe (9) are communicated to form a slurry discharge pipe junction (13). The recovery centrifuge (3), the slurry mixer (7) and the high-speed centrifuge (5) are all installed on a base (14), and the slurry mixer (7) is arranged below the underflow bin (301) of the recovery centrifuge (3).
4. The drilling fluid weighting agent recovery apparatus of claim 1, wherein, The slurry supply pump (1), the recovery centrifuge (3) and the slurry mixer (7) are connected through a slurry inlet pipe junction (12), and the slurry inlet pipe junction (12) is a three-way pipe.
5. The drilling fluid weighting agent recovery apparatus of claim 4, wherein, The application adjusts the slurry inlet valve (2) and the slurry mixing valve (6) to separate high-density drilling fluid containing rock cuttings into the recovery centrifuge (3) and the slurry mixer (7); 6. The drilling fluid weighting agent recovery apparatus of claim 5, wherein, The application separates the weighting agents by using the recovery centrifuge (3), discharges the separated weighting agents into the slurry mixer (7) to be uniformly mixed, and discharges the mixed weighting agents into the circulating tank (11); 7. The drilling fluid weighting agent recovery apparatus of any of claims 1-6, wherein, 8. The drilling fluid weighting agent recovery apparatus of claim 5, wherein, 9. A method of recycling for the drilling fluid weighting agent recycling apparatus of any one of claims 1 to 8, characterized in that, The separated cuttings-containing drilling fluid is transported to a high-speed centrifuge (5), which separates clean drilling fluid and cuttings, and discharges the clean drilling fluid into the circulating tank (11).